Anti-scrap-bounding female die for high-speed progressive die

Abstract

The invention discloses an anti-scrap-bounding female die for a high-speed progressive die. The anti-scrap-bounding female die comprises a female die body and a female die cutter point arranged on the female die body and is characterized in that: the female die cutter point is circular; the upper section of the female die cutter point is a cutting edge incision section having a cutting edge incision depth; a plurality of uniformly distributed inclined grooves inclined to the central line of the female die cutter point are formed on the inner wall of the cutting edge incision section; and the uniform depth of each inclined groove is 0.1 to 0.2 millimeters. In the anti-scrap-bounding female die for the high-speed progressive die, the inclined grooves are formed below the cutting edge incision depth of the female die cutter point; at the initial stage of a blanking working procedure, blanked wastes can form small protrusions corresponding to the inclined grooves of the female die; the protrusions can be compressed (a flattening function) by the side face of the female die, the holding-on force of scraps is enhanced and the friction is increased, so that the wastes are prevented from bounding, the production efficiency of finished products is improved and the defective rate and the production cost are reduced.

Description

technical field [0001] The invention relates to a die structure, in particular to a high-speed progressive die anti-chip-jumping die used in a high-speed progressive die in the cold stamping industry to prevent waste materials from bouncing back. Background technique [0002] In the metal cold stamping industry, high-speed progressive dies have high production efficiency, high product precision, are easy to realize automation and mechanization, and are suitable for mass production needs. Therefore, they are widely used in the stamping manufacturing industry of automobiles, electronics, and household appliances. [0003] At present, the mainstream speed SPM (Strike Per Minute) of domestic molds is concentrated at 40-2000, and punches and molds exceeding 4000SPM have been developed internationally. However, no matter in the past or now, the "chip jumping" of high-speed progressive dies has always been a problem that bothers design and production personnel. The so-called "chip...

AI Technical Summary

Problems solved by technology

[0004] Existing mold manufacturers process the cutting edge of the concave die. In order to ensure the sharpness of the cutting edge and easy blanking, they usually use high-precision machine tools such as slow wire cutting and optical curve grinder to process. The size can be controlled within ±0.002mm, and the surface finish is also good. Reach below Ra0.2, so the side wall of the cutting edge of the die is very smooth, the friction between the chip and the cutting edge of the die is f=u×N, where f: friction force, u: friction coefficient, N: positive pressure , because the friction coefficient u is very small, the friction force f between the chips and the side wall of the knife edge will decrease, resulting in easy chip jumping, and the existing high-speed blanking material is hard and has low extensibility, which is also prone to chip jumping. If the chips are not removed in time, the product surface will be crushed or deformed, and even the knife edge will be broken, the punch will be broken, and the expensive mold and high-speed punch spindle will be damaged.

Images