The concept of " profiled tube " , its advantages and disadvantages

nuances of the process of rolling shaped tubes.

This product belongs to a special class of hire, which is used in the process of assembling the various metal structures.Its distinguishing feature is considered to be oval or polyhedral cross-sectional profile.Most often, it occurs either square or rectangular.

Naturally, in transport systems or conventional pipe shaped tubes obviously can not be applied.They have insufficient capacity and low resistance to internal pressure.Their production of belt strips, does not provide for the formation of high-quality and reliable connection seam.

Sectional tubes also are oval in shape, and their rent is divided into welded and seamless pipes, which are subjected to a release (at the end of the formation of the profile of the internal stress is removed) or released without final heat treatment.

Speaking in short, the diversity of the produktsiif so much that we have created a few guests.For example, the square pipes and their parameters determines the normative document GOST 8639-82.In such documents indicate that the size of thick-walled and thin-walled shaped tubes can not be more than 180h180mm.In the largest of them, the wall thickness shall be from 8 to 14mm.The smallest is the rental of square cross section and has a face to 1cm., And 1mm.tolschiny wall.

All these values ​​are significantly influenced the technology of longitudinal deformation profile hire.You must agree, it is difficult to bend the hollow beam 18h18sm wall thickness which is almost 1.5 cm.

Rolling essentially takes the idea from the rolling mill.The machine has the shape of a pyramid of three cylinders (1 and 2 below the top).Cylinders, which are arranged below referred rollers.They are responsible for transportation.The upper roller is designed for profile pipe deformation.

rolling process is very simple: you need to lay the pipe to the bottom pair of rollers above and tuck portion that remained between the upper cylinder.Due to the contact pressure, which is transported to the upper roll, pipe bends gradually, thus deforming the longitudinal profile.deformation zone may extend the entire length of the product, if you include the supply.Naturally, the length of the product can not be deformed in a single pass.Thanks to roller mills can even form a looped profile.

Roller machines come in several forms.For example, roller listogiby not cope with the relevant pipes, so they are used only to deform the sheet metal.As a finished product, made with the help of this machine, you can see the different gutters, sills, etc.

machines with three rollers used for the deformation of sheets and tubes for deformation.Machine power depends on generator downforce.If it is a hydraulic drive, it will be able to even bend the tee.But if the equipment is common to the third roller clamp, its performance will be below average.

machines on four rollers are the most powerful.They can form not only the arc but also circular profile.In this type of machine is a mechanical drive, which greatly complicates the design and increases power consumption.However, the result is worth it.It is their use in mass production of profile pipes.