Large outer hexagon bolt blank hot forging and stamping mould

Abstract

The invention relates to a large outer hexagon bolt blank hot forging and stamping mould, which comprises an upper mould plate, an upper mould base plate, an upper fixing plate, an elastic body, an upper molding plate, an upper male mould, a first molding plate, a second molding plate, an ejector rod sleeve plate, an auxiliary ejector rod sleeve plate, a lower mould base plate, a lower mould plate, an ejector rod, an auxiliary ejector rod and an auxiliary plate, wherein a first hole is arranged on the ejector rod sleeve plate; a molding face for molding an upper end face of an outer hexagon head is arranged on the lower end of the upper male mould; a screw head molding hole is arranged on the first molding plate; a cross section of the upper male mould and a cross section of the screw head molding hole are respectively in a hexagon shape; the second molding plate is provided with a screw rod molding hole for molding a screw rod; the diameters of the screw head molding hole, the screw rod molding hole and the first hole are sequentially reduced; a first chamfered face is arranged on the upper end of the first hole; and a cooling water channel is arranged in the first molding plate. The large outer hexagon bolt blank hot forging and stamping mould can be used for molding a bolt blank at a time, and has higher production efficiency and longer service life.

Description

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

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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. Bolt blanks cannot be formed at one time; secondly, due to the existence of oxide layer and flash, the fillet on the screw head and the chamfer on the screw are not easy to process, and subsequent finishing is required. Finishing removes the oxide layer and flash, and processes the circle Corners and chamfers increase the processing time and reduce production efficiency; the third is that when the mold is used for processing, the temperature of the mold rises relatively high, and cold water is poured on the mold, causing the mold to suddenly cool, and the mold is prone to deformation, reducing the mold temperature. service life

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