SU804052A1 - Tube welding mill inner mandrel - Google Patents

Description

(54) INTERNAL SHIM OF TUBE-WELDING MILL

one

The invention relates to the production of electrically welded pipes, and more specifically to the structures of internal welding marks of pipe welding mills and can be used in the design of new and reconstruction of existing pipe welding mills for welding process or working shvov.

The known inner mandrel to the high-frequency pipe welding mill includes a frame with support rollers located in the drive sections of the mill, roller wiring, rollers to ensure the convergence angle of the edges and rollers providing the edge sinking and located close to the welding zone 1.

The disadvantage of this design is low reliability and durability of the mandrel as a result of jamming and breaking down of rollers located close to the welding zone, because metal splashes emitted from the weld center accumulate in the gap between the rollers and their clips flat metal mass.

Closest to the proposed technical essence is the internal op

The rake of the pipe-welding mill, containing supporting rollers fixed on the frame, roller wiring, internal rollers to provide the angle of convergence of the workpiece edges and rollers stabilizing the position of the joint 2).

The disadvantage of this design is that the internal mandrel of the pipe-welding mill is that the reliability and durability of its work is reduced, because during the welding process, metal splashes emitted from the weld center accumulate in the gap between the end surfaces of the inner rollers and their clips, while The end surface of the rollers forms a solid dense mass of metal in the form of a peel, which leads to seizure and damage to the rollers and failure of equipment. In addition, for such a construction of the inner mandrel, losses in the mill productivity are due to forced downtime for cleaning the end surfaces of the rollers.

The purpose of the invention is to increase the reliability and durability of the internal mandrel.

The goal is achieved by the fact that in the inner mandrel of a pipe-welding mill containing a frame, support rollers, roller wiring, rollers to ensure the convergence angle of the edges and rollers that stabilize the seam position, on the end surfaces of the rollers that stabilize the position of the groove, there are spiral projections directed in the direction opposite to the working direction of rotation of the rollers.

Such a constructive implementation of the inner mandrel of the pipe welding mill prevents damage and seizure of the rollers, which are closely located to the welding zone, with metal splashes emitted from the weld center and accumulating as a flat mass in the gap between the po; by the faces stabilizing the position of the seam and their holders by making spiral rollers on the end surfaces of the said rollers directed in the direction opposite to the rotation of the rolls.

FIG. I shows the inner mandrel of the pipe welding mill .; general form; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a view B in FIG. 2

The inner mandrel of the pipe welding mill consists of a frame 1, support rollers 2 located in the drive train sections, side rollers of wiring 3, lower and upper roller wiring 4, rollers 5 to create the necessary convergence angle of the rollers 6, enclosed in the yoke 7, stabilizing the position seam and located B close to the welding zone. On the end surfaces of the rollers 6, there are made spiral projections 8 directed in the direction opposite to the direction of rotation of the rollers 6. Between the end surfaces of the rollers 6 and the surface of the clips 7, the gap in which metal splashes accumulate, ejected from the weld center, is 5 -7mm.

The device works as follows.

Pipe blank 9 is fed to. mandrel, support rollers 2 together with drive

outer rollers move the pipe billet to the crimping rolls of the welding cage. The rollers 5 create the desired convergence angle. The edges are heated by high-frequency currents to the welding temperature and squeeze them in the caliber of the welding cage until a welding joint is formed. In order to stabilize the seam position, the rollers 6 are mounted in the casing 7. During the welding process, inclined protrusions 8 made on the end surfaces of the rollers 6 (roller caps) separate the metal splashes ejected from the weld center and do not allow the metal to be formed the strong pressure of the cooling water is washed out from the surface of the roller.

The proposed internal mandrel of the pipe welding mill, in comparison with the known ones, allows to increase the mill productivity by eliminating forced downtime for cleaning and removing accumulated metal splashes, as well as for replacing the outgoing tool. As a result, the reliability and durability of the tool increases.

Claims (2)

Invention Formula Internal mandrel of pipe welding mill containing supporting rollers fixed on the frame, roller wires 1. rollers for providing the angle of convergence of the edges and rollers stabilizing the position of the groove, which in order to increase the reliability and durability of the internal mandrel, rollers stabilizing the position of the groove , are made with spiral protrusions on the ends, directed in the direction opposite to the working direction (d) of the rollers. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 35.6010, cl. B 21 C 37/08, 1969. 2. USSR author's certificate No. 455768, cl. B 21 C 37/08, 1972. (prototype). / -®-EB. L. about :: / chg /, 7 t "./v V L- / 1 fcr