Five Abbreviations of Defects in Aluminum Alloy Die Castings

Cold, crack, shrinkage, gas and desquamation are the five major defects of aluminum alloy die casting

1、 Cold: rough roughness, cold lines, insufficient water, etc. on the casting surface.

2、 Cracks: refers to the tension cracks, top cracks, cold cracks due to too low mold temperature, and shrinkage cracks.

3、 Shrinkage: It refers to the casting surface is uneven and concave.

4、 Air: refers to air holes at the feed inlet of the casting, at the overflow slag ladle, on the surface of the casting, and inside the casting.

5、 Stripping: It means that there is a thin layer of purple peeling on the surface of the casting. We call it peeling. Some are thick, some are thin, and some are very small. Some are thin, and the other side is separated from the casting body.

The above mentioned are all the defects of die castings. In the past, peers have described hundreds of casting defects. Most of the names of casting defects we have not understood or heard. Some people who have read books for several years also said that the names of casting defects are related to physics. China’s die casting history has been thousands of years. Today, how can we talk about casting defects so complex? You say yours, I say mine. Later, I think that if the names of casting defects are not unified, there will be no way to communicate, Through my practical work experience, I wrote down the five major defects of castings: cold, crack, shrinkage, gas and desquamation.

Remove five major defects:

1、 Understand the casting process and find out the correct feeding direction.

2、 Understand the product weight. How large the sprue needs to be positioned.

3、 Understand the product structure. How to use the runner. The runner is a guide runner.

4、 Understand the product structure. Open the inner gate. One inlet. Two inlets. Multiple inlets. Point bead inlet

As long as you decompress, you can solve the five major defects from these aspects.

At present, several defects of castings have been the difficulties of die casting companies:

1、 How can the air hole stay at the inner pouring port.

2、 What are the problems that cause the blowholes at the technological flow slag ladle mouth.

3、 How do the bubbles come from the casting surface.

4、 Why the casting porosity is difficult to remove.

5、 What is the main process error of casting diaphragm.

6、 Why the casting will peel – does it matter if the mold release agent is used.

7、 Why is it difficult to make aluminum with the beginning of 6 words? What details should be proposed.

8、 After electroplating, the surface of zinc alloy castings has bubbles. It is a material problem or a mold (machine and mode) problem or a electroplating factory problem. How can we determine whether it is a material problem – or a die-casting process problem – or a mold problem – or a electroplating problem.

9、 How to achieve the surface strength of zinc alloy castings.

10、 What kind of release agent is best for copper castings.

Die casting technology: it is the basis for the survival of die casting companies. Good technology can reflect the company’s ability.

Die casting management: it is the development direction of die casting companies. The best management of die casting companies is to achieve control (control cost, control quality, and manage output), and let all managers and employees follow the management system formulated by the company.