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- Time of issue:2021/12/27
What are the solidification methods of aluminum die casting mold
(Summary description)One of the characteristics of casting production is liquid forming. The transformation from liquid to solid, that is, the solidification process has a direct impact on the quality of castings. The appearance of shrinkage cavity, porosity, porosity, stress, deformation, crack and other defects is the result of unfavorable control of solidification process. The control of solidification process, in addition to the control of the solidification environment of the casting (such as the effect of forces other than pressure and gravity, the overall cooling rate of the casting, etc.), the selection and control of the solidification mode (sequence and direction) of the casting is one of the very important contents. Generally, the solidification methods of castings are divided into "simultaneous solidification principle" and "sequential solidification principle". 1) The principle of simultaneous solidification is to adopt technological measures to ensure that there is no temperature difference between various parts of the casting or the temperature difference is as small as possible, so as to solidify at the same time. Although this solidification principle has the advantages of solidification period, it is not easy for the casting to produce hot cracks, it is not easy to cause stress and deformation after solidification, and the riser is very small or not used at all. However, the casting is not compact, and there are shrinkage defects in the central area. 2) The principle of sequential solidification is to adopt various measures to ensure that an increasing temperature gradient is established between the part far away from the riser (or gate) and the riser (or gate) on the casting, so that the part far away from the riser solidifies first, then the part close to the riser, and then the riser itself solidifies. The advantage of this solidification principle is that it can ensure that the shrinkage cavity is concentrated in the riser to obtain a dense casting.
What are the solidification methods of aluminum die casting mold
(Summary description)One of the characteristics of casting production is liquid forming. The transformation from liquid to solid, that is, the solidification process has a direct impact on the quality of castings. The appearance of shrinkage cavity, porosity, porosity, stress, deformation, crack and other defects is the result of unfavorable control of solidification process.
The control of solidification process, in addition to the control of the solidification environment of the casting (such as the effect of forces other than pressure and gravity, the overall cooling rate of the casting, etc.), the selection and control of the solidification mode (sequence and direction) of the casting is one of the very important contents.
Generally, the solidification methods of castings are divided into "simultaneous solidification principle" and "sequential solidification principle".
1) The principle of simultaneous solidification is to adopt technological measures to ensure that there is no temperature difference between various parts of the casting or the temperature difference is as small as possible, so as to solidify at the same time. Although this solidification principle has the advantages of solidification period, it is not easy for the casting to produce hot cracks, it is not easy to cause stress and deformation after solidification, and the riser is very small or not used at all. However, the casting is not compact, and there are shrinkage defects in the central area.
2) The principle of sequential solidification is to adopt various measures to ensure that an increasing temperature gradient is established between the part far away from the riser (or gate) and the riser (or gate) on the casting, so that the part far away from the riser solidifies first, then the part close to the riser, and then the riser itself solidifies. The advantage of this solidification principle is that it can ensure that the shrinkage cavity is concentrated in the riser to obtain a dense casting.
- Categories:Industry news
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- Time of issue:2021-12-27 14:01
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One of the characteristics of casting production is liquid forming. The transformation from liquid to solid, that is, the solidification process has a direct impact on the quality of castings. The appearance of shrinkage cavity, porosity, porosity, stress, deformation, crack and other defects is the result of unfavorable control of solidification process.
The control of solidification process, in addition to the control of the solidification environment of the casting (such as the effect of forces other than pressure and gravity, the overall cooling rate of the casting, etc.), the selection and control of the solidification mode (sequence and direction) of the casting is one of the very important contents.
Generally, the solidification methods of castings are divided into "simultaneous solidification principle" and "sequential solidification principle".
1) The principle of simultaneous solidification is to adopt technological measures to ensure that there is no temperature difference between various parts of the casting or the temperature difference is as small as possible, so as to solidify at the same time. Although this solidification principle has the advantages of solidification period, it is not easy for the casting to produce hot cracks, it is not easy to cause stress and deformation after solidification, and the riser is very small or not used at all. However, the casting is not compact, and there are shrinkage defects in the central area.
2) The principle of sequential solidification is to adopt various measures to ensure that an increasing temperature gradient is established between the part far away from the riser (or gate) and the riser (or gate) on the casting, so that the part far away from the riser solidifies first, then the part close to the riser, and then the riser itself solidifies. The advantage of this solidification principle is that it can ensure that the shrinkage cavity is concentrated in the riser to obtain a dense casting.
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