SU368904A1 - METHOD OF MANUFACTURING A PIPE WITH A SCREW GOFF - Google Patents

Description

one

This invention relates to the field of metal forming.

There is a known method of manufacturing pipes with a screw corrugation by acting on a flexible element on a rotating pipe.

However, in a known manner, only relatively low corrugations on pipes of finite length can be obtained.

In order to provide a continuous process of corrugation according to the proposed method, the impact on the pipe is carried out by several flexible elements, the linear velocity of each of which is equal to the product of the peripheral speed of the pipe and its radius under the corresponding element.

On fkg. Figure 1 shows schematically an apparatus for carrying out the proposed method; in fig. 2 - installation diagram of flexible elements, the number of which depends on the height of the formable corrugation.

The tubes / are mounted on the mandrel 2 with the profiled rollers 3, are overwhelmed with several single-turn flexible threads 4, arranged in a helix against the rollers 3.

Then alternate tension and movement of flexible threads around the tube are performed so that the value of tangential deformation (depth of penetration into the tube of each thread) remains approximately the same, and the speed of movement increases from one thread to another as the diameter of the tube decreases.

The tube under the action of the filaments receives translational and rotational motion, and by reducing the helix tag on the mandrel, the corrugation pitch on the tube is reduced to the size of the finished corrugation.

Subject invention

A method of manufacturing pipes with screw corrugations by applying a flexible element to a rotating tube, characterized in that, in order to ensure a continuous process of forming a corrugation, the pipe is subjected to successively several flexible elements, the linear velocity of each of which is equal to the product of the peripheral speed of the pipe by its radius under the corresponding element.