Torsion beam internal high-pressure one-time forming method

Abstract

The invention provides a torsion beam internal high-pressure one-time forming method. The torsion beam internal high-pressure one-time forming method comprises the following steps that S1, a forming mold is opened; s2, the two ends of the pipe are placed on two material supporting blocks correspondingly, an upper die base is driven to move downwards, and when the two material pressing blocks make contact with the two ends of the pipe, the material supporting blocks are driven to move downwards; when the material supporting block moves downwards to a preset distance, the upper die base and the material supporting block stop moving downwards, and profiling core rods are inserted into preset positions at the two ends of the pipe correspondingly; s3, the upper die base and the material supporting block continue to move downwards, when the material supporting block moves downwards to a preset distance, the material supporting block stops moving, and the material pressing block is driven to move upwards; when the material pressing block moves upwards to a preset distance, the upper die base and the material pressing block stop moving, and sealing heads are inserted into preset positions at the two ends of the pipe correspondingly; and S4, the interior of the pipe is filled with water, and internal high-pressure one-time forming of the pipe is completed through pressurization, pressure maintaining and pressure relief actions. An intermediate procedure is omitted, the equipment requirement and energy consumption are reduced, the mold input cost is reduced, the efficiency is improved, and the product stability is improved.

Description

technical field [0001] The invention relates to the technical field of automobile torsion beam forming, in particular to a high-pressure one-time forming method in a torsion beam. Background technique [0002] At present, the torsion beam for vehicles is mainly formed by sheet metal stamping or hydroforming. Sheet metal stamping has low precision and is mostly suitable for torsion beam parts with simple shapes, and the torsion beam assembly after welding is heavy, which is not conducive to the development of lightweight automobiles. With the continuous development of hydroforming technology and its application in the manufacture of auto parts, the use of hydroforming technology to manufacture torsion beams can not only form torsion beams with complex cross-sections, but also make their cross-sections continuous and varied, adapting to different loads. The requirements for changing the cross-section size and improving the forming accuracy are also in line with the current de...

AI Technical Summary

Problems solved by technology

The current process has the following defects: First, the round tube is in line contact with the upper mold during the mold closing process, and the tube is not completely fixed in the lower mold cavity, so the rotation deviation is very easy to occur during the mold closing, resulting in a V-shaped R after pressing. The left and right angle shapes are asymmetrical, which affects the performance of the torsion beam and does not meet the design requirements. Second, the two ends of the pipe are not inserted into the profiling mandrel. The dent is formed due to poor material feeding; this defect will not be eliminated during hydroforming, resulting in products that do not meet the design requirements and ultimately fail to meet the bench test requirements

Images