5. Working belt width size
Determining the working belt of the split-combined mold is much more complicated than determining the half-mold working belt, not only considering the difference in wall thickness of the profile, the distance from the center, but also considering that the die hole is covered by the splitter bridge. The die hole under the shunt bridge must be thinned due to the difficulty of metal flow.
When determining the working belt, first find the place where the wall thickness of the profile under the shunt bridge is the thinnest, that is, the metal flow resistance is the largest. The minimum working zone here is twice the wall thickness, the wall thickness is thicker or the metal is easy to reach. Where the work belt should be properly considered thickening, generally in a certain proportional relationship, plus the correction value of easy flow.
6. Mold hole empty knife structure
The die hole empty cutter is the structure of the cantilever support at the outlet end of the die hole working belt. When the wall thickness of the profile is t≥2.0mm, a straight-blade structure with easy processing can be used; when t<2mm, or with a cantilever, a slanting knife can be used.