Movable die pull-back structure of die casting die

Abstract

The invention discloses a movable die pull-back structure of a die casting die. The movable die pull-back structure comprises a movable die and a fixed die which are matched with each other to form a die casting cavity for a die cast, and a demolding jacking rod which is arranged in a guide rod through hole formed in the movable die and is used for jacking a die cast out, wherein the central axis of the guide rod through hole is perpendicular to a die parting surface formed when the movable die and the fixed die are jointed; a pull-back cavity coaxially communicated with the guide rod through hole is formed in the movable die in the die casting cavity; a die-opening pull-back block is arranged in the pull-back cavity and is formed by die casting of the die cast; the die-opening pull-back block and the pull-back cavity are matched with each other to form a die-opening pull-back structure for increasing wrapping force of the die cast and the movable die; and the jacking surface of the demolding jacking rod abuts against the bottom plane of the die-opening pull-back block. The movable die pull-back structure can rationally control the final size change of the die cast, so that the die casting shortcomings can be reduced, and the service life of the die-casting die is prolonged; and moreover, the production yield of the die cast is improved, and the production and maintenance cost is reduced.

Description

technical field [0001] The invention relates to the technical field of design and manufacture of die-casting dies, in particular to a movable die-drawing structure of die-casting dies. Background technique [0002] Die casting mold is a big category in mold. In recent years, with the rapid development of my country's automobile and motorcycle industries, the die-casting industry has ushered in a new period of development. But at the same time, higher requirements are put forward for the comprehensive mechanical properties, life and mold structure of die-casting molds. [0003] Die casting is a precise production process, however, there are many factors that can affect the final dimensional variation of die castings. Dimensional changes can be divided into linear changes (mainly caused by shrinkage), movement dislocation between molds, parting line, casting and mold warpage, die-casting parameters, core-pulling and drafting angles, etc. But one thing must be remembered tha...

AI Technical Summary

Problems solved by technology

[0004] In the die-casting process, die-casting deformation is a major defect type of die-casting parts, which will eventually cause the shape and size of the die-casting parts to be inconsistent with the drawing requirements, making the die-casting parts scrapped

There are many factors that cause die-casting deformation. Among them, the unbalanced clamping force of the dynamic and fixed mold caused by shrinkage is an important reason for the pulling deformation of the die-casting when the mold is opened. Therefore, the structural factors of the die-casting itself can easily cause local fixed dies. The poor structure of the mold wrapping force is greater than the moving mold wrapping force, resulting in defects such as die-casting deformation and sticking molds, which not only greatly reduces the service life of the die-casting mold, but also affects the final dimensional change of the die-casting, and even causes the die-casting to pull cracks, which in turn affects the product qualification rate and increases production and maintenance costs

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