A kind of plum blossom inner hexagonal punching needle and preparation method of needle

Abstract

The invention belongs to the technical field of metal punching and particularly relates to a plum blossom type inner hexangular punch needle and a preparation method of a needle head. The plum blossomtype inner hexangular punch needle is an A type punch needle and comprises a T-shaped head, a needle rod and the needle head; the T-shaped head and the needle rod are made of high-speed steel materials; the needle head is made of a hard alloy material, and the hard alloy material comprises, by mass, 92.5%-94.5% of mixed powder and 5.5%-7.5% of forming agents, wherein the mixed powder comprises 83.5%-88.5% of WC and 11%-16% of Co and further comprises 0.3%-0.65% of Cr3C2 or VC; and the forming agents are composed of paraffin, low-molecular coupling agents and high molecular polymers. The preparation method of the needle head comprises the processes of ball milling, mixing, pelletizing, injection forming, degreasing, sintering and the like. According to the plum blossom type inner hexangular punch needle, properties of strength, hardness, high-temperature resistance, abrasion resistance, toughness and the like are excellent, the production cost is low, the service life is long, the product consistency is good, and the rejection rate is lower than 0.3%.

Description

technical field [0001] The invention belongs to the technical field of metal stamping, in particular to a method for preparing a plum-blossom inner hexagonal punching needle and a needle head. Background technique [0002] In cold stamping processing, stamping dies are used to process metal or non-metal materials into parts or semi-finished products. The punching needle, also known as the punching head, is an indispensable accessory in the work of the stamping die, and belongs to the replaceable die consumable; the punching needle installed on the stamping die performs continuous punching and punching operations, so that the processed material is separated or plasticized Deformation to obtain the desired finished or semi-finished products. [0003] At present, the materials used for the actual production of punching pins are mainly steel or hard alloy. In the production of large-scale hardware products, there are defects such as wear, deformation, and sticking materials, re...

AI Technical Summary

Problems solved by technology

[0005] However, in powder injection molding, cemented carbide has low feeding strength and density, and poor fluidity. The injection process is a non-isothermal, non-uniform, and unsteady complex flow process of non-Newtonian fluid, which shows poor fluidity and solidification speed. Fast, easy to cause insufficient filling of the cavity, easy breakage of the blank, and structural defects such as under-injection, holes, deformation, fracture, burrs, sandwiches, density gradients, surface defects, and uneven single weight

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