Long-life high-efficiency die-casting punching head

Abstract

The invention discloses a die cast punch with continuous taps at the back end. The characteristics are: the front end of the punch has a front convex platform that is a gyrorotor or intercept polygon cone with axial section lessening and the axial lead of the gyrorotor parallels or superposes the axial lead of the punch. The front end of the punch also has a ring end face connecting the back end of the convex platform. The platform and the wall of the pressure chamber form a round band area to quickly solidify the alloy melt flowing into the area in order to prevent other high-pressure melt flowing out between the chamber and the punch and the round band area and the feed cake is integrate.

Description

technical field [0001] The invention belongs to the field of metal die-casting and relates to a die-casting punch suitable for a die-casting machine. Background technique [0002] For a long time, die-casting punches used in die-casting machines at home and abroad have been improving the wear resistance of the punch itself by applying new materials, new heat treatment or surface treatment processes, thereby increasing the life of the punch, thereby reducing replacement time and improving production efficiency . For example, CN1114690A uses beryllium-nickel-copper alloy material to replace the commonly used cast iron material for the die-casting punch, that is, to increase its wear resistance by using a new material to improve life and production efficiency. CN2128251Y is to carry out laser scanning hardening treatment at local intervals along the circumferential direction of the die-casting punch made of cast iron material, that is, to increase its wear resistance by adopti...

AI Technical Summary

Problems solved by technology

Since the die-casting punch is subjected to high speed and high pressure at high temperature when it works in the pressure chamber (barrel), the main failure mode of the die-casting punch is: the punch and the pressure chamber ( The gap between the barrel) is too large, causing the molten metal to escape from the punch and the pressure chamber (barrel) during the die-casting process (commonly known as: running material), so that the molten metal cannot build up high pressure and fail

On the one hand, the punch moves at high speed in the pressure chamber, which determines that there must be a certain gap between the punch and the pressure chamber; on the other hand, the injection force of the die-casting machine directly acts on the metal liquid through the punch, resulting in The high pressure must be sealed by a reasonable gap between the punch and the pressure chamber. If the gap is too large, it will fail due to material running out. Therefore, this is a serious contradiction.

And the application of above-mentioned new material, new technology, although can improve the wear resistance of punch itself, make the life-span of punch and production efficiency improve to a certain extent, yet, caused the manufacturing cost of punch to improve greatly thus, What is more serious is that the life of the pressure chamber is reduced due to accelerated wear

Because the production cost of the pressure chamber (barrel) is very high, so, economically speaking, such efforts are often not worth the candle, and the total cost is even higher.

[0003] In addition, in the prior art, no new breakthrough has been seen in the structure of the punch itself. The front end face of the punch is always a circular plane perpendicular to the axis, and the front peripheral surface is always a cylindrical working surface. It will fail when it wears to the upper limit of the reasonable gap with the pressure chamber

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