TH7439EX - Clip - Google Patents

Abstract

A hollow-shaped part (16) is molded by extruded pressurized empty tubes (15) inside the mold (11,13) with gaps (35,41) corresponding to the cross-section. The final hollow layer required for productivity (16) and increased pressure to exceed the wall limit of the empty tube (15) to compress into the empty tube (15) to come into contact with the cavity inside the mold (35, 41) The bare tube (15) is selected so that the final yield (16) and the mold cavity (35,41) have an appropriate circumference, no more than 5% larger than the blank tube circumference to avoid. Avoid the occurrence of weak spots or cracking of the empty tubes due to excessive expansion of the perimeter. The internal pressure evenly presses the empty tube (15) into the corner of the mold (35,41) while the coupling is closed. And the empty tube (15) was eliminated inside the mold (11,13) without the part (47) of the mold, clamped the empty tube (15) while closing the mold (11,13) down to each other.

Claims (1)

1. The process of forming a hollow cross-section, in which at least the longitudinal part is a continuous, uniform, continuous cross-section profile. Which have at least two commonly opposed transverse plane surfaces And the corner which consists of The arrangement of the molds is determined by the part of the mold with open and closed positions. Each part has a cavity of a mold with a cavity section and a matching plane surface. And this cavity has one side of the cavity that extends in the character.