Method for Determining the Position of Rollers in Three-point Bending Flexible Cold Forming of Longitudinal Welded Pipes

Abstract

The invention discloses a straight welded pipe three-point bending flexible cold-roll forming roller position determining method and belongs to the technical field of cold-roll forming. The method is used for fast adjustment of welded pipes which are formed by a flexible cold-roll forming machine and made of different materials and of different specifications, that is, after W is preformed, when the welded pipes made of the different materials and of the different specifications are formed through the three-point bending cold-roll flexible forming machine through the downhill method, roller position parameters including the forming contact point coordinates of a mold roller with the material springback eliminated and a plate and the axis angle of a side roller are worked out according to knurling drawings. By the adoption of the method, the coordinates of the contact point of the mold roller with the material springback amount eliminated and the angle of the axis of the side roller can be worked out rapidly and accurately, the problem that due to the fact that different units for welded pipe flexible cold rolling are different in structure and mold roller dimension, inapplicability is caused is solved, and the influences of material springback on the forming precision are avoided.

Description

technical field [0001] The invention belongs to the technical field of sheet metal forming and cold-bending welded steel pipe forming manufacturing equipment, in particular to a method for determining the roll position of three-point bending flexible cold-bending forming rolls of straight seam welded pipes. Background technique [0002] At present, with the development of science and technology, there is a huge demand for various types of welded pipes in industries such as automobiles, construction, petroleum exploration, chemical industry, and nuclear power. The set of rolls can only form welded pipes of one material and one specification, and there is also an advanced set of rolls that can form multiple flexible forming methods of different specifications, such as row roll forming, FFX forming, etc. The basic principle is three-point bending forming, which can be The production of welded pipes of different materials and specifications can be realized through automatic and ...

AI Technical Summary

Problems solved by technology

[0002] At present, with the development of science and technology, there is a huge demand for various types of welded pipes in industries such as automobiles, construction, petroleum exploration, chemical industry, and nuclear power. The set of rolls can only form welded pipes of one material and one specification, and there is also an advanced set of rolls that can form multiple flexible forming methods of different specifications, such as row roll forming, FFX forming, etc. The basic principle is three-point bending forming, which can be The production of welded pipes of different materials and specifications can be realized through the automatic and rapid adjustment of the roll position parameters stored in the process database. This kind of forming method can save a lot of mold rolls and adjustment time, but it is very difficult to obtain welded pipes of different materials and specifications.

[0003] At present, the position parameters of the rolls in the flexible cold-bending process of welded pipes often require experienced craftsmen to conduct repeated tests on welded pipes of different materials and specifications in order to obtain relatively accurate position parameters for each roll, and the test workload is large. , the time is long and the cost is high; another method is to use the professional engineering and technical personnel to obtain the roller position parameters through the numerical simulation analysis of the forming process of each pipe forming equipment, and then carry out the debugging test, which can save debugging time and cost , but the modeling workload of the simulation model with different structures of the cold roll forming unit is large, and the simulation analysis and verification of the sheet metal moving at high speed and multi-process continuous bending and gradual deformation are difficult

At present, only the patent CN201110318153.7 provides a process optimization method for a straight seam welded pipe roll forming unit, but this method is highly targeted, and the determination method is extremely cumbersome and has no versatility

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