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How to solve the problem of oxidation and slag inclusion in low pressure casting

Release time:

2020-09-23

With the continuous progress of society, science and technology are also constantly developing. The products we use in life are becoming more and more refined. Mainly depends on the continuous improvement of processing technology. Now the society has aluminum casting, gravity casting, sand casting, low pressure casting and other casting methods, the benefits of different ways are not the same. This time, let's talk about how to solve the problem of oxidation and slag inclusion in low pressure casting.

Common Problems of Low Pressure Casting

Mainly aimed at the common problems of aluminum alloy wheels in low-pressure casting, the characteristics of oxidation slag defects, and the methods to prevent oxidation slag inclusions. Defect characteristics of stomatal shrinkage, causes of stomatal shrinkage and prevention methods. Defect characteristics, causes and prevention methods of shrinkage porosity. Crack defect characteristics, causes and prevention methods.

Defect characteristics: oxidation slag is mostly distributed on the upper surface of the casting, in the corner of the mold without ventilation. The fracture is mostly grayish white or yellow, which is found by X-ray or mechanical processing, and can also be found in alkali washing and pickling. Anodization or metal flaw detector.

Cause:
1, the burden is not clean, the amount of charge used back to the furnace is too much
2. Poor design of gating system, improper setting during punching
3. The slag in the alloy liquid is not cleaned up
4. Improper pouring operation and slag inclusion
5. Insufficient standing time after refining and metamorphic treatment

Prevention methods:
1, the burden should be blown sand, the amount of back to the use of appropriate reduction.
2. Improve the design of the pouring system and improve its slag retaining ability
3, the use of appropriate flux to slag
4. The filter screen should be placed smoothly during pouring, and attention should be paid to slag removal
5, after refining before pouring alloy liquid should stand for a certain period of time

Low pressure casting is a very common and practical processing method. However, during operation, the problem of oxidation and slag inclusion in low-pressure casting is often caused by some demands or improper processing techniques. The above has described the reasons and solutions for the occurrence of oxidation slag with very good quality.

Key words：

Pengyu

What are the main classification and characteristics of aluminum die casting?

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What are the main classification and characteristics of aluminum die casting?

What factors will affect the process of low pressure casting