The die casting part is a kind of simple or complex metal part dies casting. It is to cast aluminum, copper, zinc alloy, copper alloy, aluminum alloy, and other metals heated to liquid by a die casting machine to produce aluminum, copper, zinc alloy, copper alloy, aluminum alloy, and other metal parts with limited shape and size.

Generally, these kinds of parts do not need finishing after casting, so the cost is saved to a certain extent. Therefore, these aluminum, copper, zinc alloy, copper alloy, aluminum alloy, and other metal die-casting parts are widely used in automobiles, electric vehicles, instruments, electronics, communication, toy, furniture, bathroom, and other industries.

However, some aluminum, copper, zinc alloy, copper alloy, aluminum alloy, and other metal die casting parts have waterproof or sealing purposes, so the sealing test of die casting parts is needed.

What is the sealing test of die casting parts?

For die casting parts with waterproof or sealing requirements, the sealing test of die casting parts mainly focuses on the leakage ports with leakage such as cracks, pores, vortex holes, shrinkage holes, shrinkage porosity, slag holes, and pinholes. The sealing test of die casting parts can be used to quickly detect the products that meet the requirements and avoid the overall unqualified products caused by unqualified die casting parts.

The airtightness and waterproof detection of die casting parts generally adopt dry compressed air, and the air-gas molecules are relatively small. With the precision sensor of the airtightness and waterproof testing machine, small leakage can also be detected.

Of course, the volume and shape of different die casting parts are different, so different tooling fixtures need to be customized for fixation or hole plugging, so that the sealing and waterproof test of die casting parts can be carried out.

Problems often encountered in die casting parts

• Overall or local deformation;

• The geometry of the die casting part does not match the drawing.

Causes of die casting parts deformation

• Poor casting structure;

• Premature mold opening and insufficient casting stiffness;

• Improper setting of ejector rod and uneven stress during ejection;

• When the gate position or gate thickness is too thick, it is easy to deform when the gate is cut off;

• The local surface is rough, the resistance is large, and the product is deformed when ejected; The local temperature of the mold is too high, the product is not fully cured, and the jacking force is large, resulting in product deformation.

How to improve the deformation of die casting parts?

• Improve the structure of parts;

• Reasonably adjust and maintain the pressure;

• Reasonably set the position and quantity of pushers;

• Change the gate position to make the gate a little, reduce the gate thickness, ensure the casting quality of the product, and make the product not easy to deform when removing the gate;

• Strengthen mold surface treatment to reduce demoulding resistance;

• Control the local mold temperature to maintain the heat balance of the mold.

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