用于小线规屏蔽电缆的新型半挤压式模具

摘要

The small shielded cable extrude sheath when the extrusion die and the semi extrusion die are selected, which appears defect. Therefore, a new type of semi extrusion die is designed. Through the mold core design two parts, which include the ellipsoid and the cylinder and the structure of the mold core and the die sleeve is designed. Take EN 50306-3 300 V 1 x 1. 0 MM S 105 wire cable for example, the optimization of the structure of semi extrusion die, the cable surface is round, the sheath and the braiding layer are easily stripped.%小线规屏蔽电缆挤出护套时采用挤管式、挤压式或半挤压式模具生产都存在缺陷.为此对半挤压式模具进行优化,将模芯承径区设计成椭球和圆柱两个部分,承径椭球区可控制挤塑时的压力,达到挤出塑料层与导体或线芯之间紧密度可调节的效果.同时以EN 50306-3 300 V1×1. 0 MM S 105小线规屏蔽电缆挤塑护套为例,采用该新型半挤压式模具,电缆表面圆整、护套与屏蔽层之间易剥离且挤塑压力易控制.