Closed multidirectional die forging forming die and forming method for VL-shaped ball cage cylindrical shell

Abstract

The invention provides a closed multi-directional die forging forming die and forming method for a VL-shaped ball cage cylindrical shell. The closed multi-directional die forging forming die and forming method comprises the steps that S1, a blank is placed on a lower die; s2, a first downward pressing mechanism drives an outer core shaft to penetrate through the annular blank and make contact with a lower die, and then pressurization continues to be conducted so that the raceway forming protruding blocks can be outwards expanded; s3, the second pressing mechanism drives the forming upper die to move downwards to make contact with the annular blank; s4, the horizontal die is closed, the inner wall of the annular blank makes contact with the unfolded raceway forming protruding blocks, raceway shallow grooves are gradually formed in the inner wall of the annular blank, and during the period, a second downward pressing mechanism drives the forming upper die to gradually move downwards till the forge piece is formed; s5, the first pressing mechanism gradually decompresses to enable the mandrel to return to the original position; and S6, the horizontal die and the forming upper die return to the initial position, and the forged workpiece is taken out. According to the forging method, the uneven condition caused by the fact that the upper end face and the lower end face are not restrained when the VL-shaped ball cage cylindrical shell is forged is overcome, the follow-up machining time is saved, the utilization rate of raw materials is increased, and unnecessary waste is avoided.

Description

technical field [0001] The invention relates to die design and processing of automobile parts, in particular to a closed multi-directional die forging forming die and forming method for a VL-type spherical cage cylindrical shell. Background technique [0002] The constant velocity joint is a key part of the car. Its main function is to connect the transmission output shaft and the reducer input shaft that are not on the same line, and to ensure that the angle and distance between the two shafts do not change frequently. Power can still be delivered reliably. At present, the types of universal joints used in automobiles include ball-fork type universal joints, ball-cage telescopic universal joints, three-pronged constant velocity universal joints, etc. Among them, the ball-cage telescopic universal joints—VL type ball cage The knuckle has the advantages of long life and high strength and is often used in medium and high-end automobiles. In the production process of VL-type ...

AI Technical Summary

Problems solved by technology

However, there are many mechanical processing steps in this method, which will cause the metal flow line of the forging to be destroyed, which will deteriorate the mechanical properties of the forging and reduce the service life of the VL-type spherical cage universal joint. Therefore, it is necessary to adopt a forming process to produce the VL-type ball cage shell

[0003] Due to the existing forging process of the VL-type spherical cage shell, the upper and lower end surfaces will have protrusions or depressions during the forging process, which greatly affects the forging quality of the VL-type spherical cage cylindrical shell, resulting in more difficult follow-up machining. cumbersome

However, although the traditional airtight forging structure makes the upper and lower end faces smooth, it will increase the stress of the forging on the die and reduce the service life of the die.

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