[China Aluminum Industry] casting surface cracks of aluminum alloy slabs is a common problem. The surface cracks that occur during the semi-continuous casting of aluminum alloys should take into consideration many factors:
1. mold taper;
2. Casting temperature
3 slag casting process 4. Melt overheating;
5. The casting process is too fast 6. The cooling system 7. The chemical composition of the alloy 8. The operating skills Solution to the surface cracks of aluminum alloy slabs:
The key to solving this problem is to consider three main aspects:
1. It is the control of the chemical composition of the alloy type 2. It is the casting process of the alloy type.
3. It is operational skills and natural conditions.
Crystallization of aluminum alloy, also known as condensate tank, plays a decisive role in casting. The taper change of the aluminum alloy crystallizer cannot be ignored for casting. The crystallizer's taper is too large. The segregation of the surface of the ingot will increase when it is cast. If the operation is not good, slag inclusion will cause surface cracks. If the crystallizer is too narrow, surface cracking will occur when the slab is cast. A good casting master can adjust the size of the crystallizer at any time to prevent surface cracks caused by flat boring during casting.
Surface cracks in aluminum alloy slabs are also critical for cooling water. Whether the cooling water is evenly distributed or not, the strength of the large and small surfaces, the size of the water, and the temperature of the water have a great influence on the solid-liquid region.
In summary, the surface cracks of aluminum alloy slabs are one of the common defects in the melting process. Eight analysis reasons should be taken into consideration during the casting process, and neglecting every detail can lead to errors and losses and waste. Alloy composition, impurity control issues, and process settings need to be studied and analyzed based on different environments to make accurate judgments. For example, the slag on the surface of an aluminum alloy flat ingot is one of the more surface cracks caused during the casting operation. Most of them are caused by improper operation, such as the control of the furnace temperature - water pressure - speed - whether the flow tray horn is flat - the level of the crystallizer level, operation, etc. are present in every detail. In order to prevent the occurrence of surface cracks in aluminum alloy slabs. This is true for everything from semi-continuous casting to fully automatic casting. For example, the internal quality defect in fully automatic casting is a new topic. For example: feathered crystals, columnar crystals, vertical trees, and the production and prevention of bright crystal columns, we will continue research and discussion.
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