Shaft end bevel gear forging mould

Abstract

The invention discloses a shaft end bevel gear forging mould which comprises an upper mould, a lower mould, a pressing plate, a mandrel, a base plate, a mould base and an ejector rod. An axial through hole in clearance fit with the ejector rod is formed in the middle of the base plate, the base plate is flatly arranged at the bottom of a cavity in the upward end face of the mould base, the lower mould is inserted into the cavity of the mould base and axially positioned by taking the base plate as a base, the pressing plate sleeved on the outer wall of the lower mould is connected with the mould base, the mandrel is axially inserted into a mould cavity of the lower mould from top to bottom until the base plate is axially limited, the ejector rod is an elongated rod relative to the mandrel and penetrates the through hole in the middle of the base plate, the ejector rod and the mandrel are connected into a whole, and the gravity center of the structure is low, so that the mandrel is conveniently reset after a workpiece is ejected. As the diameter of the ejector rod is much smaller than that of the mandrel, the hole for matching the ejector rod with the base plate is also small, the contact area of the mandrel and the base plate is enlarged, plastic deformation of the base plate is avoided in the forging process, and the forging quality of the workpiece is ensured.

Description

technical field [0001] The invention relates to a forging die, in particular, the invention relates to a die for forging a shaft end bevel gear. Background technique [0002] The output shaft in the automobile transmission is a shaft with a bevel gear at one end. For this kind of shaft, the most advanced production technology in this industry is to use die forging to realize the production of bevel gears. After the forging is formed, it is ejected by the ejector pin at the bottom of the mold. . The cavity of the lower die in the prior art is positioned axially by the mandrel, and the lower die is supported on the backing plate. Because the backing plate corresponds to the mandrel, there is a through hole for the axial movement of the ejector rod. In addition, the diameter of the mandrel and the The diameter difference of the ejector rod is small, so the diameter difference between the through hole on the backing plate and the mandrel is also small. During forging, the pres...

AI Technical Summary

Problems solved by technology

However, the above-mentioned adjustments are all at the cost of stopping production, and the production order is disturbed, which will inevitably cause certain economic losses.

In addition, the mandrel and the ejector rod have a separate structure. When the forging is formed and ejected, the mandrel with a small ratio of length to diameter is easy to get stuck during the return process and cannot return to the original position. The operator also needs to handle the return of the mandrel. Consumed man-hours

Generally speaking, the existing technology has low production efficiency and cannot meet the requirements of mass production

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