Receiving main mould structure of returning ejector pins in step-type product

Abstract

The invention relates to a receiving main mould structure of returning ejector pins in a step-type product. The receiving main mould structure comprises a main mould sleeve, wherein a rear pad is arranged at the bottom of the main mould sleeve; a pushing ejector pin hole is formed in the rear pad; a pushing ejector pin is arranged in the pushing ejector pin hole; the pushing ejector pin comprises a head part and a rod part; a spring is arranged on the rod part between the head part and the rear pad; middle annular bushes are arranged at the top of the rear pad, on the exterior of the pushing ejector pin and in the interior of the main mould sleeve; an alloy mould is arranged at the top of each middle annular bush; receiving ejector pin holes are formed in the alloy moulds; receiving ejector pins are arranged in the receiving ejector pin holes; an alloy mould sheet is arranged at the top of each alloy mould; alloy mould sheet mounting holes are formed in the front end of the main mould sleeve; and the alloy mould sheets are mounted in the alloy mould sheet mounting holes and surround the peripheries of the receiving ejector pins. The receiving main mould structure is long in service life and low in cost; if parts are damaged, the parts only need to be locally replaced and do not need to be totally replaced; the requirements on technical workers are low; a machine can be easily debugged; and the product quality and appearance are also greatly improved.

Description

technical field [0001] The invention relates to a cold heading die structure, in particular to a step-type product return thimble material-connecting main die structure. Background technique [0002] At present, when manufacturing step-type cold forging products, most of them will use the butterfly spring locked by the set screw as shown in Figure 1. The compression force of the butterfly spring withstands the friction block, and the thimble is milled with a flat position. The movement in the thimble hole has been receiving and feeding by the friction between the flat position and the friction block, but after a long time of use of this structure, the following disadvantages will appear: the thrust of the thimble is unstable; under the action of the friction block, the thimble will It is easy to be eccentric, resulting in eccentricity of the product, so that the finished product size after cold heading is unqualified; due to long-term friction and wear, the friction block, t...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a step-type product return thimble main mold structure, which can solve the shortcomings of unstable thimble thrust, unqualified products, friction and wear, short life and high requirements.

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