EMP Tech Co.,Ltd
EMP Tech Co.,Ltd
Contact Us
Please fill in the form below and our professionals will contact you within 12 hours! For a more prompt reply, you may reach us by phone call or WhatsApp: +86 136 9425 7500.
How to Deal With the Surface Defects of Aluminum Die Casting?

How to Deal With the Surface Defects of Aluminum Die Casting?

How to Deal With the Surface Defects of Aluminum Die Casting?

Cast aluminum is a process in which molten aluminum is poured into a mold and cooled to form aluminum parts in the desired shape. Castings obtained by casting aluminum are called aluminum castings.

During the casting process, aluminum castings are prone to defects such as internal looseness, shrinkage, and porosity. these castings with defects are after machined, the surface dense layer components are removed, but the internal tissue defects are exposed.

Defective appearance:

Casting crack: It is a crack formed at a higher temperature. It is easy to appear when the volumetric shrinkage of the casting is large and the thermal expansion coefficient is large.

Heat treatment cracks: Due to overheating or overheating caused by heat treatment, often showing trans-crystalline cracks.

The causes of cracks and suggestion:

1. The structural design of the casting is unreasonable, with sharp corners, and the thickness of the wall changes too much. If cracks occur in this case, the structural design of the casting should be improved to avoid sharp corners, and strive to strengthen wall thickness and smooth transition.

2. Cracks can also occur in sand molds (cores) with poor yielding properties. Measures should be taken to increase the concession of the sand mold (core).

3. Partial overheating of the mold will cause cracks, and it should be ensured that all parts of the casting are solidified simultaneously or sequentially, and the design of the pouring system is improved.

4. If the pouring temperature is too high, cracks will also occur, and the pouring temperature should be appropriately reduced.

5. When the casting is taken out from the casting mold too early and the casting will be deformed, the thermal correction method should be used. The cooling time of the mold should be controlled.

6. The heat treatment is overheated, and the cracks are generated after the cooling rate is excessively exciting. The thermal correction method is used when the casting is deformed. Correctly control the heat treatment temperature and reduce the quenching cooling rate.


Related News
  • Influence of Additives on Aluminum Casting Process

    Influence of Additives on Aluminum Casting Process

    In the process of aluminum castings, if the additives used are not correct, it will affect the degassing and slag removal effect during the casting process, or the casting temperature will be abnormal...
  • The 2 main categories of aluminum die casting parts

    The 2 main categories of aluminum die casting parts

    1.OverviewAccording to the requirements of use, it can be divided into two categories. One type of parts bearing larger load or parts with higher relative movement speed. The items to be inspected inc...
  • We are back to work

    We are back to work

    The outbreak of Novel Corona Virus in 2020 affects the work and life of all Chinese, which makes this Spring Festival a little "special."To prevent the virus and start resumption of work. EM...