Causes and Solutions of Surface Cracks on Aluminum Alloy Flat Bars
2018-04-24 09:01:12
[China Aluminum Industry Network] 1. The causes of surface cracks in aluminum alloy slabs:
The casting surface cracks of aluminum alloy slabs are a common problem. The surface cracks that occur in semi-continuous casting of aluminum alloys should take into account many factors: 1 mold taper; 2 casting temperature; 3 slag inclusion in the casting process; 4 melt overheating; 5 too rapid casting speed; 6 cooling system; 7 alloy chemistry Ingredients; 8 Operational skills; Case 1 An 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.
Second, aluminum alloy flat ingot surface crack solution:
The key to solving this problem is to consider three main aspects: 1) Control of the chemical composition of the alloy. 2 is the casting process of alloy varieties. 3 is operational 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, it will produce surface cracks when casting slabs. A good casting master will adjust the size of the crystallizer at any time to prevent surface cracks in the slab 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. Case 2. There was a surface crack often occurred in a aluminum company when it had just made slabs. There was no analysis of the causes and a great deal of waste was caused. One of my colleagues visited the factory to find out the problem. Because the water temperature was too high, it was adopted. Chemical and physical methods of action solve the problem of surface cracks. Case 3. Some companies use the water in the fish pond as cooling water, and the surface of the aluminum alloy ingot is blocked by the suspended solids that cause excessive pores.
To sum up, the surface cracks of aluminum alloy slabs are one of the common defects in the casting process. Eight analysis reasons should be taken into account during the casting process. Failure to follow every detail can lead to errors and losses. Alloy composition. Impurity control problems and process settings need to be analyzed and analyzed according to different environments to make accurate judgments. For example, the slag on the surface of an aluminum alloy flat ingot is one of more surface cracks caused by a 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 - operations, etc., exist 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 to conduct research and discussion.
The casting surface cracks of aluminum alloy slabs are a common problem. The surface cracks that occur in semi-continuous casting of aluminum alloys should take into account many factors: 1 mold taper; 2 casting temperature; 3 slag inclusion in the casting process; 4 melt overheating; 5 too rapid casting speed; 6 cooling system; 7 alloy chemistry Ingredients; 8 Operational skills; Case 1 An 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.
Second, aluminum alloy flat ingot surface crack solution:
The key to solving this problem is to consider three main aspects: 1) Control of the chemical composition of the alloy. 2 is the casting process of alloy varieties. 3 is operational 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, it will produce surface cracks when casting slabs. A good casting master will adjust the size of the crystallizer at any time to prevent surface cracks in the slab 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. Case 2. There was a surface crack often occurred in a aluminum company when it had just made slabs. There was no analysis of the causes and a great deal of waste was caused. One of my colleagues visited the factory to find out the problem. Because the water temperature was too high, it was adopted. Chemical and physical methods of action solve the problem of surface cracks. Case 3. Some companies use the water in the fish pond as cooling water, and the surface of the aluminum alloy ingot is blocked by the suspended solids that cause excessive pores.
To sum up, the surface cracks of aluminum alloy slabs are one of the common defects in the casting process. Eight analysis reasons should be taken into account during the casting process. Failure to follow every detail can lead to errors and losses. Alloy composition. Impurity control problems and process settings need to be analyzed and analyzed according to different environments to make accurate judgments. For example, the slag on the surface of an aluminum alloy flat ingot is one of more surface cracks caused by a 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 - operations, etc., exist 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 to conduct research and discussion.