Metal mold structure having gas venting unit and jig for removing the gas venting unit in injection molding apparatus.

摘要

A metal mold structure having a separate gas venting unit (113) detachable from a metal mold (101). The gas venting unit disposes therein a gas vent valve. The metal mold (101) is formed with an upper opening (103) in which an insertion segment (105) is insertable. Upon the insertion, a unit insertion recessed portion (111) is provided. The unit insertion recessed portion (111) has a recessed shape substantially identical with an external contour of the gas venting unit. A jig device (129) is also provided for removing the gas venting unit (113) from the recessed portion (111). The jig device includes a jig body (131) mounted on the metal mold (101), a bolt like moving means (137) movably extending through the jig body and selectively engageable with the gas venting unit (113) positioned in the unit insertion recessed portion, and a driving means (135) for moving the moving means in an axial direction thereof.