1。 Considering the problem of wall thickness, the thickness gap will have an impact
on filling2. Considering the problem of demolding, this point is very important in the actual die casting, in reality often such a problem often occurs, which is much more annoying than injection mold demolding, so the setting of the draft slope and the calculation of the dynamic fixed mold release force should pay more attention, the general draft slope is 1 to 3 degrees, usually considering the smoothness of the demolding, the slope of the outer draft is smaller than the slope of the inner draft, the outer draft is only 1 degree, and the internal draft is about
2~3 degrees 3。 When designing, take into account the problem of mold design, if there are multiple positions of the pumping position, try to put it on both sides, *** do not put the lower pumping position, so that the pumping will be easy to cause problems
after a long time4. Some die castings may have special requirements for the appearance, such as oil spraying, powder spraying, etc., at this time, the structure should avoid important appearance positions to facilitate the setting of gate overflow grooves
5. In terms of structure, try to avoid the appearance of structures that cause complex mold structures, such as having to use multiple drawing or spiral pumping
6。 For the parts that need to be surface processed, pay attention to the need to leave a suitable amount of processing when designing the parts, not too much, otherwise the processing staff will scold you, and the pores inside will be exposed, not too little, otherwise the rough and fine positioning will be processed, well, the black skin has not been dried off, you will wait for the spark on the mold, then how much to give, the amount of retention should not be greater than 0. 8mm, so that the processed surface can hardly see the porosity, because it is protected by a hard layer.
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 requirements8
. Aluminum alloy is not elastic, and the buckle can only be matched with plastic.
9。 Generally, you can't make deep holes! Only spot holes are made when the mold is opened, and then post-processing!
10。 If it is a thin-walled part and should not be too thin, and it must be reinforced ribs to increase the bending ability! Because the temperature of aluminum castings is about 800 degrees Celsius! The mold life is generally relatively short, and if you make it like a motor shell, it is only about 80K and goodbye!
1. The design of die-casting parts is similar to the design of plastic parts, and some design conventions of plastic parts are also suitable for die-casting parts.
2. For aluminum alloy, the temperature and pressure of the mold are much greater than that of plastic, and the correctness of the design is particularly strict. Even if the mold material is good, once there is welding, the mold has almost no life. Zinc alloy is similar to plastic and has a better mold life.
3. There should be no concave sharp corners to avoid mold chipping.
4. Although the accuracy of die casting parts is relatively high, it is worse than plastic, and the drafting force is larger than plastic, usually the structure should 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 into a cone pit and post-processing. 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-casting parts (including silicon), and it usually takes a little longer to appear black.