Hot forging and pressing mold of large inside hexagonal bolt blank

Abstract

A hot forging and pressing mold of a large inside hexagonal bolt blank comprises an upper template, an upper mold base plate, an upper fixing plate, an elastic body, an upper forming plate, an upper male mold, a first forming plate, a second forming plate, an ejector rod sleeve plate, an auxiliary ejector rod sleeve plate, a lower mold base plate, a lower template, an ejector rod, an auxiliary ejector rod and an auxiliary plate. A first hole is arranged on the ejector rod sleeve plate, a downward-convex hexagon head is arranged in the middle of the lower end of the upper male mold, a concave cambered surface used for molding a fillet on a bolt head is arranged at the circumferential edge of the lower end of the upper male mold, and an annular first chamfer surface is arranged at the connection position of the hexagon head and the upper male mold. A bolt head forming hole is arranged on the first forming plate, a bolt rod forming hole used for bolt rod forming is arranged on the second forming plate, diameters of the bolt head forming hole, the bolt rod forming hole and the first hole are reduced successively, a second chamfer surface is arranged at the upper end of the first hole, and a cooling water channel is arranged in the first forming plate. The hot forging and pressing mold of the large inside hexagonal bolt blank has the advantages of being capable of once forming the bolt blank and being high in production efficiency and long in service life.

Description

technical field [0001] The invention relates to a forging die, in particular to a hot forging die for a large hexagon socket bolt blank. Background technique [0002] At present, there is a large hexagon socket bolt (the industry generally refers to a hexagon socket bolt with a screw diameter greater than or equal to 30mm as a large hexagon socket bolt), which includes at least two steps in processing: the first step is to process and form a large hexagon socket bolt blank, Hereinafter referred to as the bolt blank; the second step is to process the thread on the screw rod of the bolt blank. Since the first step directly determines the production efficiency and product quality of large hexagon socket head bolts, the following processing of large hexagon socket head bolts refers to the first step, that is, processing and forming bolt blanks. [0003] The structure of the bolt blank includes a screw rod and a cylindrical screw head with an inner hexagon. Its production proces...

AI Technical Summary

Problems solved by technology

But described mold has following shortcoming: the one, adopt the method for water drench to carry out cooling generally when adopting described mold processing forming bolt blank, cold water is poured directly on mold and bolt blank, and bolt blank surface is oxidized rapidly and forms a layer of thinner. The thick oxide layer requires subsequent finishing, and the bolt blank cannot be formed at one time; due to the existence of the oxide layer, it is difficult to accurately calculate the weight of the blank, and the excess material in the extrusion process is extruded to form flash, which also requires subsequent finishing. B

Images