ã€China Aluminum Network】 Surface cracking is one of the common defects in the casting process. For example, if you overlook a detail in casting, you will experience an error. This will result in loss and waste. What causes the surface cracks on the aluminum alloy slab? What measures should it take if there is a crack? Detailed answers are given below.
Causes of surface cracks in aluminum alloy slabs Cast surface cracks in aluminum alloy slabs are 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, casting process slag;
4, the melt is overheated;
5, casting speed is too fast;
6, cooling system;
7, alloy chemical composition;
8, operating skills;
Case: A certain aluminum company, in the production of 5052 alloy slabs, caused three surface cracks ingots ingots, and are in the same position, resulting in companies forced to temporarily stop production. After we watched the company's delivery of the video, we found a small problem with a small amount of yellow dry oil on the back of the mold. Causes cooling water flow, resulting in surface cracks in aluminum alloy slabs.
The solution to the problem of surface cracks in aluminum alloy slabs The key to solving this problem is to consider three main aspects:
1, is the chemical composition of the alloy variety control.
2, is the casting process of alloy varieties.
3, is the operating skills and natural conditions.
The aluminum alloy crystallizer, also known as the 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 the surface cracks of the slabs from 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 water temperature all have a great influence on the solid-liquid region.
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