A temperature control method for die-casting mold core pulling

Abstract

The invention relates to the technical field of dies and discloses a temperature control method of a loose core of a die-casting die. The temperature of a die frame and the loose core rise at the same time through a die-casting die temperature machine; the setting temperature of the die frame is 160-180 DEG C; the temperature of the loose core rises at three stages particularly including the first stage that setting temperature is 100-120 DEG C and keeps for 1-2 hours, the second stage that setting temperature is 180-200 DEG C and keeps for 1-2 hours and the third stage that setting temperature is 160-180 DEG C and keeps in the normal production process. The die-casting die temperature machine controls temperature rising of the loose core of the die-casting die in a staged mode and can avoid the situation that as the size of the loose core is small and the temperature rising is too rapid, a larger temperature gradient exists between the loose core and other positions of the die-casting die such as the die frame and a die core, the deformation amount of the loose core is large and the loose core is jammed. The method is easy to operate, can improve the production efficiency and can be widely applied to temperature control of the loose core of the die-casting die.

Description

technical field [0001] The invention relates to the field of mold technology, in particular to a temperature control method for core pulling of a die-casting mold. Background technique [0002] Die-casting molds are precision molds, and their materials are generally iron-carbon alloys, with an expansion coefficient of about 0.0012% / °C. That is, a material with a length of 1m will expand by about 1.2mm when heated to 100°C. [0003] In the production process of die-casting molds, various methods are used to heat up the mold, including gas heating, alloy liquid heating, mold temperature machine heating, etc. The conventional heating method is to heat the whole mold (including the mold base, mold core and core-pulling), because the volume of the core-pulling is small and the temperature rises quickly, while other parts of the mold such as the mold base and the mold core are larger in volume and heat up faster. slow, causing the temperature gradient to be too large, and problem...

AI Technical Summary

Problems solved by technology

The conventional heating method is to heat the whole mold (including the mold base, mold core and core-pulling), because the volume of the core-pulling is small and the temperature rises quickly, while other parts of the mold such as the mold base and the mold core are larger in volume and heat up faster. Slow, resulting in excessive temperature gradient, frequent core pulling scratches, stuck and other problems

In addition, due to the unbalanced mold temperature, the service life of the mold will also be reduced