What are the shapes of plastic parts?
Plastic parts in the mold temperature should have sufficient flexibility (such as polyethylene, polypropylene, poly formaldehyde plastics), as shown in figure 3.la plastic parts, forced demoulding should meet the (A-B) /B = 5%; as shown in figure 3.lb plastic parts should meet the (A-B) /C = 5%. In most cases, the side of the plastic parts can not be forced stripping, at this time should adopt the lateral parting, core pulling and other structures.
The die structure of the side parting and core pulling mechanism not only improves the design and manufacture cost of the die, but also leaves the flying edge on the parting surface, thus increasing the amount of post processing work. The die structure can be simplified if some plastic parts are changed properly so that the lateral core pulling mechanism can be avoided.
The shape of the plastic parts should meet the requirements of the use of the premise, so that it is conducive to forming, in particular, should not try to use the lateral core pulling mechanism, so the design of plastic parts should be avoided as possible lateral concave convex shape or side hole.
