1。 Considering the problem of wall thickness, too much difference in thickness will affect the filling
2。 Considering the problem of demoulding, this point is very important in the actual die-casting, and such a problem often occurs in reality, which is much more annoying than injection molding, so the setting of the draft slope and the calculation of the demoulding force of the dynamic mold should pay attention to it, the general draft slope is 1 to 3 degrees, usually considering the smoothness of the demoulding, the slope of the external draft is smaller than the internal draft, the outer draft is 1 degree, and the internal draft is about 2~3 degrees
3。 Considering the problem of mold design when designing, if there are multiple positions of the center, try to put both sides, it is best not to put the bottom position of the center, so that it will be easy to have problems after a long time
4。 Some die castings may have special requirements for the appearance, such as oil spraying, powder spraying, etc., so it is necessary to avoid important appearance positions of the structure to facilitate the setting of gate overflow grooves
5。 In terms of structure, try to avoid the appearance of structures that lead to complex mold structures, such as having to use multiple centers or spiral centers
6。 For parts that need to be processed on the surface, pay attention to the need to give the appropriate processing allowance when designing the parts, not too much, otherwise the processing personnel will scold you, and will expose the pores inside, not too little, otherwise the coarse and fine positioning of a processing, yes, the black skin has not dried up, you just wait for the spark on the mold, then how much, the amount of retention is best not greater than 0. 8mm, the porosity of the processed surface is basically invisible, because there is a hard layer of protection.
7。 Then there is the need to pay attention to the selection of materials, whether to use ADC12 or A380, etc., depending on the specific requirements
8。 Aluminum alloy has no elasticity, and the only way to do buckle is to cooperate with plastic.
9。 In general, you can't do deep holes! Only make a little hole when opening the mold, and then process it in the post-process!
10。 If it is a thin-walled part, it should not be too thin, and it must be reinforced with ribs to increase bending resistance! Since the temperature of aluminum castings is around 800 degrees Celsius! The life of the mold is generally relatively short, and it is generally only about 80K if it is made such as the motor shell, goodbye!
1. The design of die castings is similar to the design of plastic parts, and some design conventions of plastic parts are also applicable to die castings.
2. For aluminum alloy, the temperature and pressure of the mold are much larger than that of plastic, and the correctness of the design is required. Even if the mold material is very good, once there is welding, the mold has almost no life at all. Zinc alloy is similar to plastic, and the mold life is better.
3. There can be no concave sharp corners to avoid mold chipping.
4. Although the precision of die casting is relatively high, it is worse than plastic, and the draft force is larger than plastic, usually the structure can not be too complex, and the complex parts should be decomposed into two or more pieces if necessary.
5. The screw hole of aluminum alloy is usually only made of cone pit in the mold, and post-processing is adopted. For the most demanding mating parts, a post-processing volume of 0.3mm is usually left.
6. Aluminum alloy die-casting is prone to porosity, which needs to be considered in appearance.
It is difficult to anodize the surface of aluminum alloy die castings (containing silicon), and it generally takes a little longer to appear black.