How to deal with quenching cracks in zinc alloy die castings

The performance of the die-casting parts produced by the zinc alloy die-casting factory is very good, and enjoys a high reputation in the country and the world. Due to the brittleness of zinc alloy, zinc alloy die casting is prone to quenching cracks during high temperature extrusion.

According to many years of experience of zinc alloy die casting on zinc alloy die casting, the quenching phenomenon of die castings will seriously affect the performance of die castings, thereby severely reducing the hardness, toughness and surface characteristics, so [k0] parts will be scrapped and invisibly improved. The manufacturing cost of the die casting plant.

Zinc alloy die-casting

1. Changzhou’s understanding of zinc alloy die-casting quenching crack shape:

(1) What are the quality factors of zinc alloy die-casting

We found from the periodic table that zinc ranks very high, so the nature of zinc is very active, so we can see that its performance is also very active.

Zinc alloy die casting is a product that contains zinc as a main component and contains many other magazines. Therefore, when the die-casting plant produces zinc alloy die-casting parts, it must first check the zinc alloy raw materials and strictly control the impurity content in the zinc alloy die-casting parts.

(2) What effect will the size of zinc alloy die-casting works have?

Due to the high precision of zinc alloy die-casting parts and various surface treatments and structures, die-casting parts are usually used for high-precision objects. At this time, some quenching sizes are just within the salt water quenching range (8~14mm). Due to the combined effect of structural stress and thermal stress, quenching cracks are prone to occur in hardened castings.

(3) The temperature during the zinc alloy die-casting stress relief annealing is too high

The original hardness of zinc alloy die-casting parts is weak. If the processing temperature during the annealing process is too high, the internal structure of the Shenzhen zinc alloy die-casting parts will suddenly increase the internal stress, thereby increasing the tendency to form quenching cracks.

(4) Which cooling method should Shenzhen die-casting plant choose?

Under certain conditions, such as the quality of zinc alloy die-casting raw materials, equipment, heat treatment process, etc., the heating temperature of Shenzhen zinc alloy die-casting parts in water quenching is too high, and the cooling time is too long, which is an important reason for quenching cracks in zinc alloy die-casting parts. .

2. Measures to avoid crack quenching formed by zinc alloy die-casting parts in die-casting plants

The Chinese die-casting plant is based on the morning experience of zinc alloy die-casting for many years. In order to avoid the quenching cracks of the zinc-alloy die-casting parts, the Chinese zinc alloy die-casting plant adopts the following methods:

①Improve the quality of raw materials;

②Control the rough machining size of the casting to prevent the machining size from falling into the range that is easy to crack during salt water quenching;

③Stress relief annealing after rough turning of cast slab;

④ Use reasonable quenching and cooling methods.

Related Posts

Leave a Reply

Your email address will not be published. Required fields are marked *