How to prevent deformation cracking of die casting die for auto parts

In the production manufacturing of die-casting mold parts, Hangzhou Auto parts aluminum casting manufacturer, because of its very complex appearance structure, each part has significant differences in cross-section specifications, so in the case of heat treatment, the heating cooling speed of each part is also different. Such things will result in different welding stress, mechanical in-situ stress volume change in each part of the part. It causes the volume of the parts to rise close abnormally, which causes the big error between the specification appearance, even leads to cracking.

The causes of deformation cracking in heat treatment of die-casting die are various, including the composition initial mechanism of stainless steel plate, the structure of parts, cross-section specifications heat treatment process. In the specific manufacturing, deformation can be avoided completely, only to reduce the level of its production as much as possible, but if the appropriate way is adopted, the condition of cracking can be completely prevented.

Preliminary heat treatment

In other words, the preliminary heat treatment is relative to the final heat treatment of Hangzhou Auto parts casting aluminum production, that is to say, before the final heat treatment, improve a heat treatment process with preliminary effect, which can show a good mechanical characteristics shape for the final heat treatment. The common pre heat treatment processes include quenching, quenching heat treatment.

For the preparation heat treatment of eutectoid steel hardware die, the most important thing is to remove the secondary cementite of mesh structure, optimize the crystal its thermal stress. In fact, the whole process is to carry out quenching process first then spheroidizing annealing. For stamping die cavity parts, we should first add ultra-low temperature tempering method to carry out anti-aging solution. However, for these abrasives with complicated appearance high precision, due to the higher probability of deformation cracking in heat treatment, appropriate heat treatment shall be carried out after the initial processing before the start of deep processing. Hangzhou Auto parts casting aluminum parts processing shall be prepared in advance for the final heat treatment to minimize the generation of cracking.

Quenching heating method safety protection of parts

Quenching tempering are the whole process of deformation cracking of parts. For some small medium-sized die-casting mould, long thin cylindrical mould parts high alloy steel mould parts, the quenching method of immediate heating should be prevented, only heating it to 520-580 ℃ first, then putting it into the medium temperature carburizing furnace for heating to the quenching temperature. Practical experience shows that the shape of the parts with this kind of heating method is significantly smaller than that of the parts immediately heated quenched in the heating furnace reverberatory furnace, most of the cracking conditions can be prevented.