How to deal with quenching cracks in die casting die factory?

Release time: 2022-06-08

How to deal with quenching cracks in die casting die factory?
The die castings manufactured by the die casting die factory have excellent performance and enjoy fame in the country and even the world. Due to the brittleness of zinc alloy, quenching cracks are easy to occur in zinc alloy die castings due to high temperature extrusion.
According to the years of experience of die casting die manufacturers in focusing on zinc alloy die casting, quenching of die castings will seriously affect the performance of die castings, which will seriously reduce their hardness, toughness and surface characteristics, and then scrap zinc alloy die castings, virtually increasing the manufacturing cost of die casting factories.
1. Die casting factory's understanding of quenching crack shape of zinc alloy die castings:
(1) What are the quality factors of zinc alloy die castings
From the periodic table of elements, we can find that the zinc element ranks first, so the nature of zinc element is very active, so it can be seen that the performance is also very active.
Zinc alloy die castings are products with zinc as the main component and many other magazines. Therefore, zinc alloy die casting manufacturers must first inspect the raw materials of zinc alloy when producing zinc alloy die castings, and strictly control the content of impurities in zinc alloy die castings.
(2) What are the effects of zinc alloy die casting size?
Zinc alloy die castings are generally used for high-precision objects because of their high precision, diversified surface processes and structures. At this time, some quenching dimensions are just within the range of easy cracking (8-14mm) after salt water quenching. Due to the combined effect of structural stress and thermal stress, quenching cracks are very easy to appear in the hardened castings.
(3) Avoid excessive temperature during stress relief annealing of zinc alloy die castings
The original hardness of zinc alloy die castings is weak. If the processing temperature is too high during the annealing process, the internal structure of zinc alloy die castings will suddenly increase the internal stress, which increases the tendency to form quenching cracks.
(4) Which cooling mode should die casting die manufacturers choose
On the premise that the quality of raw materials, equipment, heat treatment process and other conditions of zinc alloy die castings are certain, the high heating temperature and long cooling time of quenched zinc alloy die castings when entering water are important reasons for quenching cracks of zinc alloy die castings.

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