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1. Considering the wall thickness, the excessive thickness gap will affect the filling.
2. Consider the demoulding problem, which is very important in the practice of aluminium die casting. Such problems often appear in reality. This is much more difficult to deal with than injection moulding, so the setting of drawing slope and the calculation of the release force of the dynamic and fixed moulds should be paid special attention. Usually, the drawing slope is 1-3 degrees. Usually, considering the smoothness of the demoulding, the slope of the exterior drawing die is smaller than that of the interior drawing die, and the exterior drawing die is about 1 degree, while the interior drawing die is about 2-3 degrees.
3. Considering the problem of die design, if there are many centering positions in different directions, try to put both ends, and the best way is not to put the bottom centering, which will easily lead to problems if the time is too long.
4. The appearance of some die castings can have special requirements, such as injection, powder injection, etc. At this time, the layout should avoid the important appearance orientation to facilitate the setting of gate overflow groove.
5. Avoid presenting the layout as far as possible, which will lead to the complex layout of the die, such as having to use multiple centers or spiral centers.
6. For the parts that need surface processing, attention should be paid to the need to give appropriate processing allowance in the design of the parts, not too much, otherwise the air holes inside will be exposed, not too little, or rough and precise positioning of a processing, black skin has not been disposed of, you wait for sparks on the die, then how much, the best allowance should not be greater than 0.8mm, so that the processed surface. The stomata can hardly be seen because of the protection of hard layer.
7. What's more, we should pay attention to material selection, such as ADC12 or A380, depending on the specific requirements.
8. Aluminum alloy has no elasticity, so long as it cooperates with plastic, it should be fastened.
9. Usually we can't make deep holes! When opening the die, only a few holes are made and then processed.
10. If it is a thin-walled part, it should not be too thin, and must use reinforced ribs to increase flexural capacity! Because the temperature of aluminium castings is about 800 degrees Celsius! Die life is usually relatively short, usually made as the motor shell, if only about 80K will be damaged!
This article is organized by Foshan Jinju Qiwei Die Casting Co., Ltd., a die-casting manufacturer. The service hotline of aluminium alloy die-casting is 0757-25500218! Website: http://www.jjqw.com/.