How to bend a metal-plastic pipe 90 degrees. How to bend metal-plastic pipes: bending technology at home

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Methods for bending a metal-plastic pipe during the installation of highways

In this article, we will look at a process that gives a detailed answer to the question of how to bend metal-plastic pipe right.

How to bend a metal pipe?

Currently replacing the old metal pipes came new - metal-plastic. The advantage of a metal-plastic pipe is its flexibility, which makes it possible to lay it, as required by the main line of the planned wiring of the system, without disturbing the aesthetics.

A big plus of metal-plastic materials is quick and easy installation, which excludes the operation of welding systems.

But when installing the wiring system, you need to take into account how to properly bend the metal-plastic in order to avoid a fracture, violation of its integrity and correctly calculate the angle of rotation. So let's start with the basics.

Metal-plastic pipes are composite products consisting of several components, in particular, a polymer base and a reinforcing layer consisting of aluminum foil or metal mesh. This reinforcement helps the metal-plastic product to take a certain shape and configuration. However, it does not lose its properties. There are several ways to bend the corners of a metal-plastic line, several methods and calculations are given below:

The reinforced layer helps the metal-plastic product to take a certain shape and configuration.

This is by hand. Philistine fast method, which does not require special skills and special expensive equipment. This method can be used by anyone, even without special skills.
Mechanical bending of the structure using a pipe bender. The most efficient and fastest method used by professional installers of metal-plastic systems. Bending pipe lines with a mechanical pipe bender helps save time and achieve maximum quality installation.

With a simple manual method, you can make a bend on pipes of small diameter from 16 to 20 mm, which are more popular. To do this, we need two tools: a tape measure and a flexible external or internal mandrel, called a conductor in the language of plumbers. Well, a little skill and knowledge of mathematics to calculate the bending radius of the turn. There is a universal formula for calculating the radius - this is 5 diameters of the pipeline section. Consider the calculation on the example of a pipe with a diameter of 16 mm.

Calculation of the radius on the example of a product with a diameter of 1.6 cm

An alternative method of bending in the absence of a mandrel is to fill the bending area with salt or sand.

For a clear and correct bend, we need to get a quarter of the circle. To do this, we take the diameter of the product, 16 mm, then we get the radius we need. According to the universal formula, it is equal to 80 mm. The next step we will have is the calculation of the starting points for the exact bending of the corner. To do this, according to the formula C \u003d 2πR / 4 (where C is the size of the section necessary for work to produce a bend; π (pi) is a mathematical constant equal to 3.14; and R is the radius obtained by us using the universal formula) we find : 2*3.14*80mm /4= 125mm. We get the length of the section on which we will bend the metal-plastic water pipe.
The next thing we put on the surface is the area we calculated, the middle of which is the bending angle of the pipe.
We take a nylon twine, measure on it the distance necessary to deepen the mandrel. We tie a twine to the mandrel and run it to the desired distance inward. The twine is needed in order to remove our jig after the bend is ready. After smooth movements from the middle of the segment, we bend the pipe in even sections of several centimeters and take out our mandrel with the help of twine. It is recommended to use the inner and outer mandrel at the same time to avoid the appearance of corrugated deformation on the folds. Our bend is ready to be laid into the system. With the necessary skill, this method can be used to bend metal-plastic pipes and a slightly larger diameter.

An alternative method of bending in the absence of a mandrel is to fill the bending area with salt or sand. To do this, we fill the internal cavity, seal the holes of the filled area with adhesive tape. Then, using the same method from the middle of the segment, we bend to the desired degree.

With the help of a segment pipe bender, you can bend the pipe up to 180 degrees.

So, we got the most correct and aesthetic angle of the pipe for installation in the route with a turn, while avoiding fracture and damage. A similar method is also used to bend pipe contours.

Mechanical pipe bending is more efficient, faster and of higher quality. If you often encounter work on, then it is recommended to purchase a pipe bender, divided into several types:

Segment - pipe bend is made on the basis of a special segment. The shape of each segment is specially designed for a clear required diameter and shape. With this pipe bender it is possible to 180 degrees.
Dorn - a pipe bender of this variety helps to bend the pipe without any flaws. The advantage of a mandrel pipe bender is a segment that moves inside the pipe and helps to avoid deformation, allowing bending in several planes.

The principle of operation of devices for the correct bending of pipes is identical to the manual bending process, with the exception that with manual bending of a metal-plastic product, the beginning comes from the middle of the segment, and with mechanical bending, from the beginning of the section marked by us and the required degree or segment (template) is set on the machine. After preparing the tool for work, we insert a pipe into it and bend the configuration of the section of the mounted line we need.

With the advent of metal-plastic pipes, the work of laying networks has become so much easier that sometimes the installation process resembles a Lego game. Meanwhile, this business also has its own minor difficulties, such as, for example, changing the shape of elements and creating corners. We will learn to overcome them now. So, how to bend a metal-plastic pipe at home?

Features of working with metal-plastic products

Before bending metal-plastic pipes, it does not hurt to find out what kind of structure it is, what it consists of, what properties it has, how it differs from its "brothers".

Composition and device

So, a metal-plastic pipe is a hollow aluminum structure covered (both outside and inside) with polyethylene. The integrity of the aluminum base is achieved by welding - ultrasonic using the "overlap" method, or laser, following the butt joint technology.

Why coat aluminum on all sides? This step makes it much better. performance characteristics. Thanks to the internal coating with polyethylene, the product receives protection from the appearance of deposits, the formation of rust and other problems that impair the patency of the system. The polyethylene layer makes the pipe cavity perfectly smooth, so lime or other “garbage” simply has nothing to catch on inside the system. As for the outer layer, it protects the network elements from moisture, condensation, and corrosion.

Sometimes experts call the main “heroine” of the article a five-layer one, implying that, in addition to the three layers listed, there are two more layers of special glue.

Flexion rules

When we start to think about how to bend a metal-plastic pipe? Most often during the laying of the heating network, installation of the underfloor heating system and in other cases when working with metal-plastic products. The need for such work arises due to the lack of sale of elements of the required shape, with the right angles, etc.

Is it possible to bend metal-plastic pipes yourself? Let's figure it out. Due to the plasticity of the components of the product, it is possible to bend virtually effortlessly. However, one should not be like the hero of the proverb “there is strength - no mind is needed.” Due to its special properties, the material is very fragile, so even the slightest wrong movement can nullify all your work. More often than not, improper bending results in deformation of the inner layer, making the pipes vulnerable to corrosion and clogging. Moreover, you may not even understand that you have violated the device of the system. So, we are learning how to bend plastic pipes correctly.

Bending technologies

We will discuss all the possible options for bending pipes with our own hands, and then we will talk about the TOP 3 best methods.

Description of existing methods

So, the technologies for changing the angle of elements available for implementation at home:

The manual method is the easiest options, but also the most risky, since for an inexperienced householder in this matter, the first attempt is often unsuccessful.
The use of sand. Excellent result at no cost. Meanwhile, the technology is “dusty” and labor-intensive – for non-lazy users.
The use of wire. Some call this technique the best, but for the job you will need a wire of suitable stiffness (not the first one that came to your hand), as well as scrupulousness and patience.
Spring engagement. The technology eliminates the appearance of damage, the main thing is to choose a spring with a special diameter.

Using a pipe bender - a special "device" that provides the ideal angle - such as you planned and set on the tool mark. Marriage with the work of such a device actually does not happen. However, the price of a pipe bender can scare away those novice craftsmen who do not plan to often repeat their "exploits" in bending products.

manual method

Let's start with the simplest option that does not require additional investments. So, how to bend a plastic pipe at home, with only two hands and a desire?

Step 1. Make sure that the product and hands are dry, not greasy.
Step 2. Securely and confidently hold the structure in your hands.
Step 3. Gradually bend the pipe, making sure that the angle does not exceed 15-20 degrees.
Step 4 Step back a couple of centimeters from the intervention site and repeat the operation.
Step 5. To turn the network 180 degrees, repeat the described procedure 15 times.

Everything is relatively simple, but, of course, it is better to practice on unnecessary - fragments of structures left after cutting. The only limitation: this technology is applicable only to pipes with a radius of up to 1 centimeter. It is unlikely that it will be possible to handle elements that exceed the specified radius in diameter by hand.

Worth paying attention! To keep the pipe in shape, initially bend it to a slightly larger angle, and then unbend it to the planned figure.

Sand use

For work you will need:

Step 1. Sift the sand, making sure it is not wet.

Step 2 Fill the product with sand.

Step 3. Cap the ends.

Step 4. Place the structure in a vise, secure.

Step 5. Make a mark where the fold will be made.

Step 6. Turn on the blowtorch and bake the pipe in the intended place.

Step 7. Bend the product.

Step 8. Remove the sand.

Worth paying attention! How hot is the material? Bring a sheet of paper to the intervention area. If it starts to char, then heat is enough.

Pipe bender application

Decided to purchase a special "device"? It is commendable that you practically do not have to do anything: just read the instructions for the device and act based on the information you have learned.

A device for bending metal-plastic products is popularly called a pipe bender-crossbow. In shape, it resembles a crossbow - hence the name.

How to use the machine?

Step 1. Set the desired bend angle.

Step 2. Place the product in the groove.

Step 3. Bring the handles together.

All - you did it! It remains to take out the bent structure and do the next element.

Worth paying attention! Can't afford to buy a pipe bender? Borrow from friends, offering to help them out in return if you need any of the units available on your farm.

You see, bending a metal-plastic pipe at home is as easy as shelling pears if you are familiar with the advice of experts.

How to bend a metal-plastic pipe at home - a description of the best practices, Pipe Portal

How to bend metal-plastic pipes at home. Step by step description the most efficient bending technologies. How to bend a metal-plastic pipe without marriage?

Do-it-yourself bending of metal-plastic pipes

Modern technologies are steadily moving forward, offering new and productive solutions in the construction industry. And to replace the heavy clumsy cast iron pipes PVC products arrived. Metal-plastic elements can be mounted in a single line for quality work plumbing. However, during design repairs in an apartment or house, it becomes necessary to change the configuration of a plastic tube of any section. And here a completely logical question arises, how to bend a metal-plastic pipe in such a way as to avoid its internal or external damage. Is it possible to do this at home or will you have to invite professionals. All this in the material below.

Important: a metal-plastic tube is a monolithic PVC section, inside of which there is a reinforcing layer. That is why, when the upper plastic layer is pulled, the bending of the metal inside the hose can lead to its cracking. However, instead of purchasing additional Consumables, it is much easier to give the pipe the desired bending angle.

Options for bending pipes made of metal-plastic

For those who do not know how to bend a plastic pipe, we are in a hurry to provide several options for processing the hose to give it the desired configuration. Moreover, all of them are performed purely at home, without the use of complex devices.

The main and commonly used methods are:

The fold of the tube is simply manual with the use of physical force. The advantages of this method are manifested in low cost. However, there is a risk of spoiling the tubular product (breaking the internal clearance or deforming the PVC sheathing of the product) if the physical force at the moment of bending is incorrectly calculated.
The use of a special pipe bender. In this case, the tool ideally bends a PVC tube at home with a given radius. This method is considered reliable, since the pipe bender ensures the perfect evenness of the bent hose without damage and deformation from the inside or outside. At the same time, the lumen of the tube will also not be deformed, which is important for a well-functioning water supply system.
The use of sand. The sand will play the role of a kind of shock absorber and will not allow you to have a sharp impact on the inside or outside of the PVC tube. Thanks to the sand inside the product, it is possible to bend it at a given angle with a radius of up to 90 degrees or more. However, the process using sand is quite laborious and dusty.
Application of a special spring for PVC pipes. Bending metal-plastic pipes using such a component has no drawbacks. Here you can bend the tube to an angle with a radius of 180 degrees and at the same time not be afraid of damaging the pipe element at all. The principle of bending the product here is to introduce a spring between two straight sections of the hose.
The use of wire. Here the process can create some difficulties in selecting the wire of the desired diameter and stiffness. It is quite difficult to bend PVC tubes at home using wire. Requires outstanding physical strength to give the tube the desired angle.

Let's take a closer look at bending technologies PVC pipes at home for each of the methods.

Pipe bending by hand

If you do not know how to bend metal-plastic pipes yourself, then you can use this method.

Important: provided that physical strength allows you to do this.

It is necessary to bend plastic pipes manually in compliance with a certain technology. If you do not follow the rules, the pipe may break at the point of impact on it.

So, the work is done as follows:

The tube must be clasped with both hands on the sides of the intended bend. We bend it until the corner radius reaches 20 degrees. Now you should shift the pressing force to the left or right of the formed angle and bend the pipe again by another 20 degrees. Thus, the PVC tube is given an angle of the desired radius. In order to bend the product manually to a radius of 180 degrees, you will have to do about 15 such manipulations.

Important: it is possible to bend pipes in this way, the cross section of which is not more than 1 cm. It will be difficult to overcome the larger diameter of the PVC element manually.

To bent pipe held a given angle, you can first bend it a little more and only then unbend it to the desired radius.

Tip: in order not to waste money on a purchased, but rigid product, you can purchase several pieces of pipes from different manufacturers and practice bending pipes on them. Since each tube from a particular manufacturer has a greater or lesser rigidity, in this way it will be possible to choose best option hoses for work on a bend.

Pipe bender application

The use of such a device is very convenient at home, but the device costs big money, therefore, its acquisition for performing one-time work is not economically justified. In this case, the pipe bender bends the pipe perfectly exactly at a given angle of any radius.

The technology for performing work is as follows:

We set the crossbow pipe bender at a given angle;
We insert a piece of the tube into the device so that the expected bending angle is located exactly in the center of the crossbow;
Now it remains to gently press the handle of the mechanism so that the hose takes an angle with a given radius.

Pipe bending with sand

Here the method is completely identical to the manual one. The only difference is that in order to prevent deformation of the tube, sand is poured into its inner lumen. It protects the inner walls of the product from excessive tension and damage.

The technology for changing the angle of the tube is as follows:

A cut of the pipe on one side is sealed with adhesive tape, creating a thorough seal.
Now the tube is filled with sand in such a way that the sand does not reach about 1 cm to the edge of the inner lumen.
The second edge of the product is also sealed or closed in any convenient way.
Ready. You can bend the element to the corner of the desired radius.

At the end of the work, we open all the gaps and pour out the sand.

Spring application

This method is one of the most relevant and “painless” for PVC tubes. Here, the role of the shock absorber will be played by a spring of the desired diameter. That is, the spring ribs will completely protect the inner reinforcing layer of the PVC tube from wrinkling and subsequent damage.

Important: springs are usually sold in pairs - inner and outer. The main thing here is to choose the right diameter of the product for your pipe. In this case, it is desirable to choose a spring with O-rings, and not a flat one. The latter can produce an unexpected effect by acting excessively hard on the inner walls of the hose.

The inner spring has a tapered end on one side, which makes it easier to move it inside the lumen to the place of the intended bend. The second end of the spring is equipped with a loop. A thread can be tied to it for easier removal of the spring from the pipe after it is bent.

The outer spring has a slightly flared end that allows the tube to be inserted into it.

The technology for bending the pipe with a spring is as follows:

A cord is tied to the end of the spring and immersed in a PVC tube to the desired bending point.
Smoothly act on the pipe, providing the desired bending angle.
After the pipe has taken the corner of the desired radius, it is necessary to slightly open the corner so that the spring is released and exits the cavity of the tube without harming it.

Important: bending a PVC tube in this way is best done with smooth pumping movements. So the polyethylene inside the product will be distributed evenly and will not create an ideal environment for the accumulation of debris in the future.

Wire as a method of bending PVC products

Here, a soft wire of the desired section will act as a restraining element for the pipe walls. It is placed in the lumen of the pipe (with a length of 30-40 cm) and the tube is bent to the desired angle.

Important: it is also advisable to tie a thread or cord to the end of the wire in order to subsequently remove it from the hose.

Which of the methods to use for high-quality bending of metal-plastic pipes is up to you. However, it is worth noting that all of them have been successfully used by masters of various categories for more than a year. The main thing is to stay calm and do the work without haste.

How to bend a metal-plastic pipe at home

Methods for bending metal-plastic pipes at home. Using a pipe bender, sand, spring or wire to bend.

How to bend a metal-plastic pipe at home: instructions

Working with metal-plastic pipes always consists in the fact that they constantly need to change direction, give different configurations. Many experts say that without special equipment it is impossible to achieve smooth and harmonious forms. But it is not so.

And the question of how to bend metal-plastic pipes correctly can be solved very simply.

In many cases, it is necessary to change the angle of the profile direction. For example, if you need to equip underfloor heating, install a heating system, or simply install additional pipes. And it is often difficult to buy the desired shape of the workpiece. Therefore, you have to do this work yourself.

Training

To create certain forms, there are different kind tools:

Sand, already calcined.

Device for creating a bend.

Blowtorch for heating.

How to bend metal-plastic pipes at home?

There are many methods of this technology, so you just have to get acquainted with them and choose the ones that are suitable for your situation.

by the most simple option is bending with your hands. And so that there is no marriage, you need to adhere to a certain plan of action:

Take the pipe with your hands and gently begin to squeeze it. But the bend angle should be no more than twenty degrees.

Then step back a little from the bend. Again, start squeezing the pipe. If you need to turn the pipeline 180 degrees, then you will need to do this fifteen times. This method is best suited for pipes with a diameter of one centimeter. And the larger one will be harder to bend with your hands.

How to bend metal-plastic pipes with wire?

This option is quite effective. All work is done with wire. The metal-plastic pipe is completely filled with wire pieces. Then the material is bent. After that, all the wire is carefully removed from the pipe. As a result of the actions performed, an even and high-quality bend is obtained.

How to bend metal-plastic pipes with a spring?

If the surface of the pipe is not completely hard, then the spring bending method will do. It should be tight and tough. The spring is pulled into the pipe until it reaches the place where it is necessary to make a bend. In the middle, the bent spot and the spring should line up. Then compress the profile. You can lean on the knee. The spring is removed from the pipe with an ordinary wire.

Sand and pipe bending

The sand is first sifted and then poured into the hole. Circles are cut out of plastic and inserted into the ends of the pipe. Then the resulting structure is fixed on a vice, on the side that is farther from the place of heating. The part where you will make the bend must be heated blowtorch. Then bending is done. The rubber bands are removed and the sand is poured out.

Application of the Volnova machine

That part of the pipe, which is longer, is fixed under the clamp of the workbench. Lubricate the surface where you will bend the pipe with oil. Then the smaller side of the part is bent. Such a pipe bender is convenient and safe to use.

Apparatus by type of bending are of the following types:

Crossbow. In this case, take special form, serving for pipes of a specific size.

Spring. Mainly used for bending plastic pipes. The main part is a spring that bends it without deformation.

Segment. Obtaining a bent pipe shape is due to the fact that the segment pulls the product around itself.

Dornovye. Such a device bends tubes of small diameter and with thin walls.

In addition, pipe benders differ in the type of drive:

Manual. For this work, tubes of small diameter are used, and the material of manufacture can be from: stainless steel, polymer, non-ferrous metal.

Hydraulic. They bend pipes up to three inches in size.

Electromechanical. They work with various kinds of pipes, and also give accuracy in bending and angle.

How to bend metal-plastic pipes?

If you have the funds, then in the hardware store you can buy special equipment for these purposes. It works very simply. The main thing before starting work is to set the angle that is needed. And then put the profile there. The last step will be squeezing the ends of the handles. This method, of course, is very rarely used at home. Because the cost of equipment is very high.

It is necessary to calculate the length of the pipes after the profile has been bent. And all this time, the length is called preparatory, because it is inaccurate.

But you can make a pipe bender at home if you can't afford the machine.

For this you need to take boards. Their thickness must exceed the diameter of the pipe that will be bent.
Cut out according to the template. If necessary, you can use several boards at once, having previously fastened them.
Then screw on homemade tool to the bottom of something. But do not forget about the stop for the pipe. And you can start working.

The simplest and cheapest fixture would be a sheet of plywood and large hooks. On the plywood itself, you need to draw a line that corresponds to the bend. Drive in hooks along the line. And that's it, you can take the pipe and bend it. And you can take any diameter, because the hooks are easy to move. There is nothing complicated here, the main thing is your ingenuity and improvisation.

Tips and Summary

If you are going to bend a pipe, then you must choose one whose diameter is at least two centimeters, and the bend angle does not exceed fifteen degrees.
The smallest angle must be taken into account. Otherwise, the profile will not be usable. And everything will have to be redone.
The method is up to you, but the best option there will be a pipe bender. Such a tool makes it possible to carry out all the work faster. The principle of application is crimping, it does not allow the material to wear out.
How to bend a pipe with your own hands: with a pipe bender and without it

How to bend a metal-plastic pipe at home: instructions Working with metal-plastic pipes always consists in the fact that they constantly need to change direction, give

Simple instructions: how to bend a metal-plastic pipe?

Metal-plastic pipes have confidently replaced metal counterparts, due to their flexibility, speed and ease of installation. They do not require welding, so they are widely used in the private sector.

To lay the product in the heating system, you must first bend it. This is easy to do at home using one of the methods below.

How to choose a pipe bending method?

Although plastic pipe is flexible in nature, it does not respond well to mechanical manipulation. As a result of improper bending, it can crack, and even break. The fact is that on the inner surface, it is surrounded by an aluminum layer, which can be damaged during sudden movements.

After a significant deformation, it is almost impossible to return the product to its previous appearance, therefore, before proceeding with bending, it is better to practice.

There are the following ways to bend pipes at home:

manual bending;
the use of a pipe bender;
sand application;
heating the surface with a hairdryer.

Warming up with a hairdryer and the use of sand can be used as concomitant methods in addition to the main ones. For example, with the help of bulk material, it is possible to correct the marriage obtained during bending. The pipe bender is effective if you need to make many bends, the radius of which is different. If the metal-plastic pipe needs to be bent once, then you can limit yourself to the manual method.

Pipe bending by hand

The simplest and most common method of bending is done by hand. All that is required from the master is a little sleight of hand. The product modification process looks like this:

Carefully fold so that the resulting radius is no more than 20˚.
Step back 1 cm from the bend and bend the metal-plastic pipe a little more.
Perform up to 15 of these mini bends to rotate the product 180.
If necessary, straighten the pipe again, it should be leveled only in the reverse order.

The main rule in the manual method - smoothness and slowness of movement. You should not strive to bend the product in one go. Sudden movements can cause damage.

Manual bending is effective when working with products up to 20 mm thick. Thicker products are difficult to modify manually. The method is suitable for processing factory-insulated pipes. They are easy to install and do not need additional insulation.

Material of different thickness and stiffness bends differently, so it is better to practice before starting work. For training, you can use meter segments.

Bending pipes with a pipe bender

A pipe bender is a manual machine in the form of a spring, which ensures accurate and safe bending of the metal-plastic pipe for a radius up to 180˚. It effectively works with products from 5 to 500 mm and can be used for large volumes of work.

There are four types of machines with which you can bend a metal-plastic pipe:

hand spring (mobile, can be used at home);
hydraulic spring (works with products up to 120 mm). It withstands mechanical shocks and heavy loads, as it has a hardened body. In combination with the pump provides high productivity;
electric spring with program control;
electro-hydraulic accumulator presses.

The hand spring works with metal-plastic from 5 to 125 mm. It is characterized by a minimum weight - only 10-50 kilograms. With its help, you can modify the material with just one hand.

Bending a metal-plastic pipe with a pipe bender

The procedure for bending metal-plastic:

Insert the machine into the pipe. outdoor type springs are used if you plan to work with a long pipe and make many bends along its entire length. The internal type is effective if the bend is carried out along the edge of the pipe.
Bend the item. Bending occurs with light, gentle movements. A single bend should have a radius of no more than 20˚.
Remove spring.

Using sand and a hair dryer to bend

Sand is a simple, affordable material that will allow you to achieve a neat bend of a metal-plastic pipe at home, without the help of bulky and expensive tools.

Working with sand includes only three stages:

One of the openings of the pipe must be tightly closed.
Fill the product with sifted sand.
Slowly bend the pipe to the desired radius.

Sand is good because it fills the entire cavity of the product evenly, so no defects should occur while working with it.

The hair dryer allows not only to bend a flat pipe, but also to correct the defect of the old one. Before bending the metal-plastic pipe, need to warm it up a bit. The main thing is not to overheat the product so that it does not lose its shape. The basic rule when working with a hair dryer is the same as with other methods - to perform movements as smoothly as possible.

Bend Radius Calculation

The correct calculation of the radius depends on the diameter of the product. The example gives a calculation method for a section of 1.6 cm.

To make the bend even, you need to get 1/2 of the circle. If the diameter of the product is 1.6 cm, then its radius will be 80 mm. To calculate the starting points of the correct bend, you must use the formula C = 2πR / 4, in which:

C - the size of the segment on which you want to bend;
π is the value of pi = 3.14;
R is the radius.

Substituting known values, we get the length of the section sufficient to perform the bend 2 * 3.14 * 80 mm / 4 = 125 mm.

Then you need to transfer the resulting value to the product and select its middle, which will be equal to 62.5 mm. The center of the segment will be the middle of the bend. Then a nylon twine is taken, which measures the depth of the shipment.

To do this, tie a twine to the shipment and run it to the required distance inside the product. The string also removes the conductor after completion of work.

Next, you need to smoothly bend the product, starting from the middle of the marked segment and remove the mandrel. Both the outer and inner mandrels should be used at the same time to prevent distortion at the folds. After completing the described manipulations, the material is ready for installation.

How to bend metal-plastic pipes at home: ways and methods

When laying a home plumbing or heating system, a reasonable question often arises: how to bend a metal-plastic pipe at home. You can get a high-quality result even without special skills and knowledge. For effective bending of metal-plastic structures, there are several methods, each of which has its own advantages and features.

You can bend pipes made of metal-plastic with your own hands, there are several methods for this

How to bend a metal-plastic pipe: basic methods

Almost every piping plan has twists and turns. Therefore, the technology of bending metal-plastic pipes is used very often. If you try to give the pipe the desired shape, without knowing its characteristics, you can spoil the product. Fragile metal-plastic walls can deform or crack.

If it is necessary to bend a metal-plastic pipe at home, several methods are used.

Pipe bending by hand. The most affordable method of bending metal-plastic pipes that does not require the use of tools. You can bend your hands with a structure whose diameter does not exceed 20 mm. Pipes with a large diameter are difficult to bend by hand. Despite the speed, this method can be called the most unreliable. Whether it is possible to bend metal-plastic pipes in this way without violating their structure is a matter of practice, but without some experience, there is too much chance of violating the integrity of the material.

Springs for bending metal-plastic pipes. This method is optimal for structures made of medium-hard metal-plastic. Springs for bending metal-plastic pipes, provided that the diameter is correctly selected, can achieve high bending accuracy. You will need a sufficiently strong spring that cannot be deformed for this. A wire of length sufficient to extract the spring after bending is attached to one of its ends.

To facilitate the bending process, the pipe can be heated with a building hair dryer.

The spring is pushed along the inside of the pipe to the place where the bend is planned. It is important to ensure that the centers of the spring and the future bend exactly match. The product smoothly bends at the right angle, while you can focus on your knee. Upon completion of bending, the spring is removed.

Rigid wire for bending metal-plastic pipes. The process of bending by means of wire is longer, but also quite effective. The wire is cut into small pieces, which should fill all the voids in the pipe at the bend. A layer of wire will act as a frame that prevents the appearance of bumps and faults. Further, the pipe bends in the same way as in the case of a spring. The used wire is carefully removed from the structure. It is also necessary to check if there are any segments left in the pipe.

Sand application. One of the most time-consuming ways of bending. It is often used in cases where it was not possible to find the required spring size. Fine sifted sand is poured into the pipeline part so that no empty seats. Plugs are put on both ends of the pipe to prevent sand from escaping. The product is clamped in a vise in a place far enough from the intended bend. Before bending, the pipe section is heated with a blowtorch.

Useful advice! There is a danger of overheating the pipe, so the degree of sand incandescence should be checked. To do this, a sheet of paper is brought to the place of heating. If the paper begins to char, then the sand is sufficiently calcined.

Sand poured inside the pipe will prevent the pipe from deforming during bending.

After giving the product the desired shape, the sand is poured out. If necessary, the pipe can be flushed. Salt can also be used instead of sand.

How to bend plastic pipes with a pipe bender

A pipe bender (Volnova machine) is a device thanks to which you can easily bend a metal-plastic pipe at home. The pipe bender will allow you to bend structures without preheating, while the bending radius can reach 180 degrees. Bending of metal-plastic products with the help of a pipe bender is completely safe, while the possibility of defective parts is completely excluded. Manual machine Volnova has simple design. It consists of a handle, a movable roller, a template roller, a bracket and a curved tube. Using this device is very simple, you can even make it yourself.

At home, crossbow or spring pipe benders are most often used. The surface that the pipe will bend should be lightly lubricated with oil before starting work. This will reduce friction between the parts, and the surface of the pipe will not be damaged.

Useful advice! An analogue of a pipe bender can be made at home. It will consist of boards cut in a semicircle pattern. Such a pipe bender must be tightly fixed on the base. It is important that the thickness of the board exceeds the diameter of the pipe.

There are more advanced models of pipe benders on sale, such as hydraulic or electromechanical. On the farm, a pipe bender can only be useful for its intended purpose, that is, during the repair or installation of a pipeline. Therefore, buying expensive models makes sense only if there is a very large amount of work to be done or if such work will be permanent.

Working with a pipe bender reduces the risk of pipe deformation during bending

Calculation of the bending radius of a metal-plastic pipe

There is a universal formula for calculating the bending radius of a metal-plastic structure. According to this formula, the bending radius will be equal to 5 diameters of the pipe section. The principle of operation of this rule can be visualized using the example of a pipe with a diameter of 20 mm:

For subsequent calculations, you need to determine a quarter of the circle. If the specified diameter is 20 mm, then the radius, according to the formula, is 100 mm (20 x 5 = 100).
Starting points for corner bending are calculated. The formula C = 2ΠR/4 is used, where C is the size of the area where the work will be carried out; Π = 3.14; and R is the radius obtained above. Substituting your own data, you get the following: 2 * 3.14 * 100 mm / 4 = 157 mm. So, a section of pipe with a length of 157 mm will be involved in bending.
It turns out that every 10-20 mm is about 15 degrees from the total bend. On the surface of the pipe, the boundaries of the section are marked with a pencil. Now you can proceed to any method of bending.

Bending metal-plastic pipes at home: tips and tricks

Before starting work, it is worth making a few test bends on the sample. This will help determine the desired pressing force, choose a comfortable position and bending method. But no matter what method of bending is chosen, strong pressure and kinks should not be allowed. A perfectly even bend cannot be carried out with a sharp movement.

Metal-plastic pipes of different brands and manufacturers will have different degrees of rigidity. Accordingly, they will also bend differently. If there is no experience in using metal-plastic products, you can purchase several segments for training. In order for the pipe to hold the required shape, you can bend it to a sharper angle, and then straighten it to the desired one. So the design will be securely fixed.

All metal-plastic pipe bending technologies described above are time-tested and are actively used in the construction industry. There is nothing technically difficult in creating an even pipe bend that does not disrupt the functioning of the system. The main thing is to follow the instructions and act as carefully as possible.

How to bend plastic pipes

How to bend plastic pipes. The main methods of bending by hand. Bending metal-plastic pipes with a pipe bender. Calculation of pipe bend radius. Councils and recommendations.

Metal-plastic pipes have confidently replaced metal counterparts, due to their flexibility, speed and ease of installation. They do not require welding, so they are widely used in the private sector.

To lay the product in the heating system, you must first bend it. This is easy to do at home using one of the methods below.

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How to choose a pipe bending method?

After a significant deformation, it is almost impossible to return the product to its previous appearance, therefore, before proceeding with bending, it is better to practice.

There are the following ways to bend pipes at home:

manual bending;
application ;
sand application;
heating the surface with a hairdryer.

Pipe bending by hand

The simplest and most common method of bending is done by hand. All that is required from the master is a little sleight of hand. The product modification process looks like this:

Carefully fold so that the resulting radius is no more than 20˚.
Step back 1 cm from the bend and bend the metal-plastic pipe a little more.
Perform up to 15 of these mini bends to rotate the product 180.
If necessary, straighten the pipe again, it should be leveled only in the reverse order.

The main rule in the manual method - smoothness and slowness of movement. You should not strive to bend the product in one go. Sudden movements can cause damage.

Material of different thickness and stiffness bends differently, so it is better to practice before starting work. For training, you can use meter segments.

How to bend a metal-plastic pipe without special tools? (video)

Bending pipes with a pipe bender

hand spring (mobile, can be used at home);
hydraulic spring (works with products up to 120 mm). It withstands mechanical shocks and heavy loads, as it has a hardened body. In combination with the pump provides high productivity;
electric spring with program control;
electro-hydraulic accumulator presses.

The hand spring works with metal-plastic from 5 to 125 mm. It is characterized by a minimum weight - only 10-50 kilograms. With its help, you can modify the material with just one hand.

The procedure for bending metal-plastic:

Insert the machine into the pipe. The external type of spring is used if you plan to work with a long pipe and make many bends along its entire length. The internal type is effective if the bend is carried out along the edge of the pipe.
. Bending occurs with light, gentle movements. A single bend should have a radius of no more than 20˚.
Remove spring.

Using sand and a hair dryer to bend

Sand is a simple, affordable material that will allow you to achieve a neat bend of a metal-plastic pipe at home, without the help of bulky and expensive tools.

Working with sand includes only three stages:

One of the openings of the pipe must be tightly closed.
Fill the product with sifted sand.
Slowly bend the pipe to the desired radius.

Sand is good because it fills the entire cavity of the product evenly, so no defects should occur while working with it.

Bend Radius Calculation

The correct calculation of the radius depends on the diameter of the product. The example gives a calculation method for a section of 1.6 cm.

C - the size of the segment on which you want to bend;
π is the value of pi = 3.14;
R is the radius.

Substituting the known values, we obtain the length of the section sufficient to perform the bend 2 * 3.14 * 80 mm / 4 = 125 mm.

To do this, tie a twine to the shipment and run it to the required distance inside the product. The string also removes the conductor after completion of work.

Modern technologies are steadily moving forward, offering new and productive solutions in the construction industry. So heavy, clumsy cast-iron pipes were replaced by PVC products. Metal-plastic elements can be mounted in a single line for high-quality work of the water supply system. However, during design repairs in an apartment or house, it becomes necessary to change the configuration of a plastic tube of any section. And here a completely logical question arises, how to bend a metal-plastic pipe in such a way as to avoid its internal or external damage. Is it possible to do this at home or will you have to invite professionals. All this in the material below.

Important: a metal-plastic tube is a monolithic PVC section, inside of which there is a reinforcing layer. That is why, when the upper plastic layer is pulled, the bending of the metal inside the hose can lead to its cracking. However, instead of purchasing additional consumables, it is much easier to give the pipe the desired bend angle.

The main and commonly used methods are:

Folding the tube simply by hand with the use of physical force. The advantages of this method are manifested in low cost. However, there is a risk of spoiling the tubular product (breaking the internal clearance or deforming the PVC sheathing of the product) if the physical force at the moment of bending is incorrectly calculated.
The use of a special pipe bender. In this case, the tool ideally bends a PVC tube at home with a given radius. This method is considered reliable, since the pipe bender ensures the perfect evenness of the bent hose without damage and deformation from the inside or outside. At the same time, the lumen of the tube will also not be deformed, which is important for a well-functioning water supply system.
Sand use. The sand will play the role of a kind of shock absorber and will not allow you to have a sharp impact on the inside or outside of the PVC tube. Thanks to the sand inside the product, it is possible to bend it at a given angle with a radius of up to 90 degrees or more. However, the process using sand is quite laborious and dusty.
Application of Special Spring for PVC Pipe. Bending metal-plastic pipes using such a component has no drawbacks. Here you can bend the tube to an angle with a radius of 180 degrees and at the same time not be afraid of damaging the pipe element at all. The principle of bending the product here is to introduce a spring between two straight sections of the hose.
Wire use. Here the process can create some difficulties in selecting the wire of the desired diameter and stiffness. It is quite difficult to bend PVC tubes at home using wire. It takes remarkable physical strength to give the tuba the desired angle of bend.

Let us consider in more detail the technology for bending PVC pipes at home for each of the methods.

Pipe bending by hand

If you do not know how to bend metal-plastic pipes yourself, then you can use this method.

Important: provided that physical strength allows you to do this.

It is necessary to bend plastic pipes manually in compliance with a certain technology. If you do not follow the rules, the pipe may break at the point of impact on it.

So, the work is done as follows:

The tube must be clasped with both hands on the sides of the intended bend. We bend it until the corner radius reaches 20 degrees. Now you should shift the pressing force to the left or right of the formed angle and bend the pipe again by another 20 degrees. Thus, the PVC tube is given an angle of the desired radius. In order to bend the product manually to a radius of 180 degrees, you will have to do about 15 such manipulations.

Important: it is possible to bend pipes in this way, the cross section of which is not more than 1 cm. It will be difficult to overcome the larger diameter of the PVC element manually.

In order for the bent pipe to hold a given angle, you can first bend it a little more and only then unbend it to the desired radius.

Tip: in order not to waste money on purchased, but rigid goods, you can purchase several pieces of pipes from different manufacturers and practice bending pipes on them. Since each tube from a particular manufacturer has a greater or lesser rigidity, in this way it will be possible to choose the best hose option for bending.

Pipe bender application

The use of such a device is very convenient at home, but the device costs a lot of money, so its purchase for performing one-time work is not economically justified. In this case, the pipe bender bends the pipe perfectly exactly at a given angle of any radius.

The technology for performing work is as follows:

We set the crossbow pipe bender at a given angle;
We insert a piece of the tube into the device so that the expected bending angle is located exactly in the center of the crossbow;
Now it remains to gently press the handle of the mechanism so that the hose takes an angle with a given radius.

Pipe bending with sand

The technology for changing the angle of the tube is as follows:

A cut of the pipe on one side is sealed with adhesive tape, creating a thorough seal.
Now the tube is filled with sand in such a way that the sand does not reach about 1 cm to the edge of the inner lumen.
The second edge of the product is also sealed or closed in any convenient way.
Ready. You can bend the element to the corner of the desired radius.

At the end of the work, we open all the gaps and pour out the sand.

Spring application

Important: springs are usually sold in pairs - inner and outer. The main thing here is to choose the right diameter of the product for your pipe. In this case, it is desirable to choose a spring with O-rings, and not a flat one. The latter can produce an unexpected effect by acting excessively hard on the inner walls of the hose.

The outer spring has a slightly flared end that allows the tube to be inserted into it.

The technology for bending the pipe with a spring is as follows:

A cord is tied to the end of the spring and immersed in a PVC tube to the desired bending point.
Smoothly act on the pipe, providing the desired bending angle.
After the pipe has taken the corner of the desired radius, it is necessary to slightly open the corner so that the spring is released and exits the cavity of the tube without harming it.

Important: bending a PVC tube in this way is best done with smooth pumping movements. So the polyethylene inside the product will be distributed evenly and will not create an ideal environment for the accumulation of debris in the future.

Wire as a method of bending PVC products

Important: it is also advisable to tie a thread or cord to the end of the wire in order to subsequently remove it from the hose.

Any pipeline has corners and turns, and the smaller they are, the more reliable the system. The ability to bend metal-plastic pipes facilitates installation and allows you to make a pipeline with a minimum number of nodes. The durability of the structure depends on the correct execution of the bends and turns of the pipe.

Metal-plastic pipes are assembled in the manner of a sandwich: between two layers of high-pressure polyethylene there is a reinforced metal layer.

Reinforcement gives the product the necessary strength and rigidity, and layers of polymers protect the metal from chemical attack.

This structure makes the pipes strong, reliable and flexible. But when making turns of 90 degrees or more, there is a difference in the stress of the materials, which can lead to irreversible deformation or breakage of the pipe. The bending process is performed carefully, trying to distribute the applied force.

Note! Most often, the need for bending metal-plastic pipes arises during the installation of a warm floor, where the contour has the shape of a snake or spiral. In this case, angles and 180-degree rotations are required. In those cases when it is necessary to bypass an obstacle, I perform a “duck” - a Z-shaped bend.

The main methods of bending metal-plastic pipes

Thin pipes are bent by hand without auxiliary devices. To bend thick and hard, they resort to additional means and tools.

At home, the necessary bending of the pipes is given by the following methods:

manually without aids;
manually using means for depreciation: bulk substances, wire or spring-conductor;
using a pipe bender.

Pipe bending by hand

Pipes with a diameter of up to 2 cm are bent by hand - it is difficult to handle a larger thickness manually. This method requires training to achieve accuracy. Better than others, it is suitable when a large number of turns are not required.

The procedure is as follows:

On the pipe mark the beginning and end of the bend.
They take it in two hands so that the thumbs are located along the pipe and touch.
They bend at an angle of not more than 20 degrees, the larger the radius, the smaller the angle at each point of impact.
Move the fingers along the pipe by 1-3 cm and bend again.
Continue to move along the pipe until the end of the bend.
If the angle turned out to be excessive, holding the straight sections near the bend with your hands, gently unbend to the desired angle.