Chamfering forming process for double-end bolt middle hexagonal flange and die structure

Abstract

The invention discloses a chamfering forming process for a double-end bolt middle hexagonal flange and a die structure. The chamfering forming process comprises the steps: shearing a blank, carrying out two-end rod bundling, and carrying out middle upsetting; carrying out hexagon premolding, and constructing inverted-cone-shaped appearance; patting a frustum to be flat, filling the hexagon with amaterial, and forming an upper chamfer and a bundle tail; and leveling a hexagon washer, and forming a chamfer on another surface at the same time. A cold upsetting forming scheme is adopted in the whole process, waste of raw materials is reduced, procedures are saved, the production cost is reduced, and meanwhile, the performance and quality of products are improved.

Description

technical field [0001] The invention belongs to the technical field of metal material forming, and specifically relates to a chamfering forming process and a mold structure of a hexagonal flange in the middle of a stud bolt. Background technique [0002] Various hardware parts are usually used for processing and installation in the machinery industry. Fasteners are a common hardware part, which is a type used when two or more parts or components are fastened into a whole. General term for mechanical parts. A stud bolt is a hardware part used for the connection of automobile parts, which tightly connects two different parts through threads at both ends. There is usually a washer in the middle of the stud bolt, and the washer is generally round or hexagonal. Traditionally, stud bolts with hexagonal washers are usually trimmed after cold forming. This processing method has no chamfer in the appearance of the washer, which is easy to produce trimming burrs, and the utilization...

AI Technical Summary

Problems solved by technology

Traditionally, stud bolts with hexagonal washers are usually trimmed after cold forming. This processing method has no chamfer in the appearance of the washer, which is easy to produce trimming burrs, and the utilization rate of trimming materials is not high. Once the mold is worn out, burrs and other defects will occur. , Need to temporarily increase grinding or manual selection, increase processing cost and labor cost

However, forming chamfers according to the traditional process requires additional machining processes. Although machining can ensure that there are no burrs and the chamfers are produced by the machine, it increases the process and cycle time, and also increases a lot of production costs.

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