Cold heading die for engine bearing cover fastener

Abstract

The invention discloses a cold heading die for an engine bearing cover fastener. The cold heading die comprises a columnar floating stamping die and a hollow columnar sleeve shell, wherein the axial middle part of the floating stamping die is provided with a through hole; a cavity for the cold heading shaping of a bolt head part is formed in one end of the through hole; a limiting groove is formed in the other end of the through hole; the floating stamping die is divided into a stamping die shaping part and a stamping die hanging connection part in sequence along the axial outer side; the stamping die hanging connection part is located on one end back to the cavity; the axial inner side of the sleeve shell is divided into a sleeve shell hanging connection part and a sleeve shell limiting part in sequence; the sleeve shell hanging connection part is sheathed on the exterior of the stamping die shaping part; the sleeve shell limiting part is sheathed on the exterior of a stamping die sheathing part; the floating stamping die can axially and reciprocally slide for a certain distance relative to the sleeve shell; moreover, the stamping die hanging connection part can be stopped on the sleeve shell hanging connection part. By applying the cold heading die, the material content of a fastener head part can be effectively increased; the defects of the fastener head part are reduced; the product quality is improved; subsequent improvement procedures can be further reduced; moreover, the service life of the cold heading die can be prolonged, so that the production cost is further reduced.

Description

technical field [0001] The invention relates to a cold heading die, in particular to a cold heading die for engine bearing cap fastening. Background technique [0002] The engine bearing cover is located on the outside of the gearbox body, blocking the outer ring of the bearing, or the end cover that blocks the bearing hole. When the bearing cover is used, it is tightened and positioned by fasteners to achieve the purpose of fixing the inner ring circumferentially and axially. Engine bearing cap fasteners usually use bolts, and their production and processing usually use cold heading dies for multi-process forming processing, one of which is to cold-forge and thicken the heads of engine bearing cap bolts. In the prior art, the cold heading die for producing and processing the bolt head of the engine bearing cap generally adopts the method of fixing the die, that is, when the head of the bolt is cold heading formed, the cavity of the cold heading die head is relatively cold h...

AI Technical Summary

Problems solved by technology

The use of this form of cold heading die is likely to cause unstable material content in the head of the processed and formed bearing cap bolts, that is, it is easy to produce defects in the head of the bearing cap bolts, which affects the quality of the bearing cap bolts.

Since it is easy to produce bearing cover bolt head defects, the follow-up improvement processing procedure is increased, resulting in a decrease in production efficiency

In addition, since this form of cold heading die is fixed, it is easy to damage the cold heading die, shorten the life of the cold heading die, and increase the production cost

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