Molding method and molding device

Patent metadata

Field	Value
Publication number	US-2021170654-A1
Application number	US-201916959553-A
Country	US
Kind code	A1
Filing date	Feb 15, 2019
Priority date	Feb 16, 2018
Publication date	Jun 10, 2021
Grant date	—

Abstract

This molding method involves: a first step in which a perforation pin ( 2 ) is made to protrude into a cavity ( 13 ) in a mold ( 1 ); a second step in which a molten resin ( 16 ) is injected to fill the cavity ( 13 ) so as to envelop the protruding part of the perforation pin ( 2 ); a third step in which, in a state in which the resin ( 16 ) is in an uncured state, the perforation pin ( 2 ) is made to protrude further; and a fourth step in which the resin ( 16 ) is cured to obtain a molded resin article.

First claim

1 . A molding method comprising:
a first step of making a perforation pin protrude into a cavity of a mold;
a second step of injecting a molten resin and filling the cavity with the molten resin so as to envelop a protruding part of the perforation pin;
a third step of making the perforation pin further protrude, in a state where the resin is not cured; and
a fourth step of obtaining a molded resin article having a hole by curing the resin and extracting the perforation pin.

2 . The molding method according to claim 1 ,
wherein, in the first step, a protrusion length of the perforation pin is 25% to 40% with respect to a dimension of the cavity in a protruding direction of the perforation pin.

3 . The molding method according to claim 1 , wherein, in the third step, the perforation pin penetrates the resin.

4 . The molding method according to claim 1 , wherein the mold includes a first mold and a second mold facing each other with the cavity interposed therebetween, and
in the first step, a plurality of the perforation pins are used, and among the plurality of the perforation pins, a first perforation pin is made to protrude into the cavity from the first mold, and a second perforation pin is made to protrude into the cavity from the second mold.

5 . A molding device comprising:
a mold for injection molding;
a perforation pin capable of protruding into a cavity of the mold;
a driving mechanism for the perforation pin; and
a control section which controls a protrusion length of the perforation pin in the cavity.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Ikeda Kosuke
• Watanabe Yasunori
• SAKON Kana
• Okabe Ryoji
• Okuda Akihisa
• Ozaki Ryota

Classifications

• B29C45/0025 Primary

  Preventing defects on the moulded article, e.g. weld lines, shrinkage marks (preventing defects on the preformed parts or layers B29C45/14836) · CPC title

• B29C2945/76568

  Position · CPC title

• B29C45/36

  having means for locating or centering cores · CPC title

• B29C2045/363

  using a movable core or core part · CPC title

• B29C33/44

  with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles · CPC title