This is a very economical process for cutting through-hole of arbitrary geometry in workpiece. The wall of the openings may be inclined to the plate surface. Thanks to the considerable efficiency of this process, some cavities are increasingly being cut directly into mold plates. […]
during mold opening, the well can pull the slug off the spure bush. […]
but how to design a spure bush, I have some principles in the followin: […]
Many of today’s shops involved with micro machining are doing so on extremely hard metals, such as CPM (1-V, 3-V, 9-V) D2, A2 and F7 tool steels, along with hard powdered metals, all of which can be as hard, or harder than, 62-64 Rc. They also micro machine stainless steels like 450, 410, and 17-4 [...]
Drilling in mold manufacturing often differs from conventional drilling with respect to several key factors. For one thing, there is a greater frequency of contoured drilling surfaces. For another, the industry employs tougher materials than are typically encountered in general machining. Successfully dealing with these conditions requires an application-specific machining strategy. […]
but how to design screws on a plastic part, for external screws, the diameter should not be smaller than 4mm, for internal screws, […]
one thing must remember a sufficient gap must be reserved between holes or a hole and the wall, and the diameter of a hole also relates to it’s depth.