The bending of a profile pipe is just the case when you simply cannot cope with the task without a special tool. Despite the seemingly not very strong construction, the profile tube (rectangular or square section), even with a small wall thickness, is able to withstand considerable loads without deformation.
That is why it is often used as a frame for various lightweight buildings. But if, by virtue of necessity, you have a need to give the profile pipe a curvilinear shape, you should know how to bend it correctly without damage.
profile pipe, unlike a round pipe, differs in its shape, which can be of several types:
As stated in the GOST R 54157-2010 regulations, the round pipe must also be included in the list of core products. However, for the construction of greenhouses it is often used square form, since it is easier to attach a coating to it.
Today, pipe products are produced in a wide range. It varies in cross-sectional area, configuration, and wall thickness. That is, with regard to the bending of pipes is called the minimum radius of curvature. To begin with, it is necessary to determine the minimum radius of a flat rounded deformation. Otherwise, the workpiece will not "survive" the bending and damage.
Pipe bending options
So, to determine the smallest allowable bending radius of a rectangular or square pipe, you should know profile height (h), since:
Based on these limits, you can begin to design the manufacturing process from the profile pipe shelves, racks, frames for air vents, windows and doors, as well as other products. Also some adjustments are made by wall thickness.
If the wall thickness of a wide pipe is less than 2 mm, then it is generally not recommended to bend it. In this case, it is preferable to use welding.
If you decide to make a greenhouse from ordinary low carbon and carbon steel alloys, then they tend to slightly "spring up", i.e. return to their original position. Therefore, before installation, each arched arc will need to be rechecked and, if necessary, bend in a pattern.
Bending of shaped pipes
The shaped pipe can be bent either manually (using a manual pipe bender), or using a special machine. You can choose the method based on the following main points:
If you do not consider yourself a person with considerable physical strength even when using a long lever to strengthen it, then you better not consider the option with a manual tube bender.
In addition, if you are not going to bend pipes permanently, then it will be financially unprofitable to buy any special tool for this purpose. As a way out of this situation, you can:
Here we describe 2 methods of bending: heating and cold method.
Before you start to deform the material by the method of heating, fill its cavity with sand. This will significantly increase the quality of processing, for example, the fold will be even.
Be sure to use canvas gloves for work.
So, the work process is as follows:
Bent profile tube
In this work it is impossible to fuss and hurry. Excess movement can distort the workpiece. Moreover, it is important to observe safety precautions, because you will have to work at high temperatures.
Heating the pipes several times is not worth it. Under the influence of a temperature shock, the material simply loses its strength; worst of all, it can burst at its next glow up to 800 ° C. Therefore, everything should be done from the first time. In this case, you will be able to make the necessary blanks for the construction of the greenhouse.
It is possible to deform the pipe without resorting to heating. The cold folding process can be performed with or without a filler. For example, if the material has a profile height of up to 1 cm, then filler is not needed. If the pipe is thick, it is necessary to fill it with sand. Can also be filled with rosin.
A good alternative is the spring, which is installed directly on the bend section. At the expense of the spring, the material at the bend points will be protected from an abrupt change in the profile section. This article discusses several techniques for how to bend a profile pipe with a cold method.
Without using pipe bender
As already mentioned, you can use a spring , and also complete with a blowtorch. To do this, prepare steel wire Ø2 mm. From it you make a spring so that it can fit tightly inside the pipe. As an option, you can buy a ready-made spring designed for pipe bending.
So, the spring is inserted in the marked place and heated by a blowtorch.
Pipe Bending Machine
Such a device means several types of devices that allow to bend a pipe with a different section as for greenhouses, sheds, home greenhouses and other structures where metal framework elements are used. Pipe benders are divided into two types:
Self-made pipe bender
In general, using a pipe bender has several advantages, here are some of them :
The hardest part is choosing the right machine. The choice may depend on the pipes used, namely on the material from which they are made. For example, if it is necessary to bend a copper pipe, then it is enough to use a manual pipe bender. But if you speak for the profile pipe, then for its bending it is best to use a roller tube bender.
A manual pipe bender is a device that allows you to bend a pipe of a certain cross section by applying physical forces. The pipe bender allows you to fix the bend pipe to facilitate all the work, as well as to select the desired bend radius, focusing on the templates in its kit.
Due to the rather high physical complexity of the work on a manual pipe bender, it is usually used only to create single bent shaped tubes.
One of the popular profilegibs is the PG-1 and PG-2 manual machines. The first option is a fairly mobile device. Due to this, the bending process can be carried out directly at the work site. They can bend pipe size 40 * 40 mm. By design, the equipment has a frame and 3 rollers, which are fixed on it. Central, and he is the pressure roller pulls the pipe. Convenient handle allows you to carry out the process of work quite easily.
As for the other PG-2 model, its the design is more powerful. On this machine you can bend pipes 30 * 60 mm. If necessary, this machine can bend the pipe into a ring.
A special machine that allows you to bend pipes without making significant efforts is called profilebom. Its only disadvantage is the high cost, so it is usually used in the work of those who have to bend pipes quite often.
Using the machine, you can get any bending radius of a profile pipe without its destruction and deformation.
Flexion occurs gradually and gradually, each time at a small bending angle, which helps prevent the appearance of corrugated sections, which are almost impossible to eliminate. The absence of jerks in the operation of this type of equipment allows the pipe surface to remain smooth, since the compression of one side and the expansion of the other occurs simultaneously and very slowly.
In order to improve the quality of the work performed, it is recommended to additionally use the method of bending the profile pipe completely filled with liquid. Hydrostatic pressure, appearing in this case, does not allow the pipe walls to deform when bent. To prevent the liquid from pouring out of the pipe, special plugs are put on its ends. It should be very careful to ensure that the pipe was filled with liquid completely, without air bubbles. In addition, the bending of such a pipe should begin strictly in the center, and not from the edges.
If you need to bend You can use the "grinder" and the welding machine for this purpose:
Since it is not possible to quickly bend a profile pipe using this technology, besides, skills are required to work with a grinder and a welding machine, this method is rarely used and only for individual structures.