公开(公告)号：US5056997A

公开(公告)日：1991-10-15

申请号：US439421

申请日：1989-11-21

申请人： Hiromi Hayashi ,  Yasuaki Ichinose ,  Hiroshi Harada ,  Akimasa Kaneishi

发明人： Hiromi Hayashi ,  Yasuaki Ichinose ,  Hiroshi Harada ,  Akimasa Kaneishi

IPC分类号： B29C45/00 ,  B29C45/17

CPC分类号： B29C45/1732

摘要： A gas injection technique of injecting an inert gas (e.g., nitrogen gas) into a molten resin in a cavity, involves utilizing the strokes of reciprocation of a piston in the compression cylinder are used in a series mode, to perform a two-stage compression within the same cylinder, thereby providing a high-pressure gas. The method can also include establishing a relationship or pattern of the amount of movement of the piston with the speed of movement of the piston established to provide optimum control of the relationship between the pressure generated and piston stroke, and quantity of gas injected. The injecting gas pressure can be detected, to control a hold pressure, or the relationship between a piston stroke and generated pressure, so as to obtain optimal injecting pressure during the injection molding operation. A gas injection apparatus comprises a compression cylinder with a piston wherein the volumes of the two chambers on both sides of the piston are of such a compression ratio to provide the first compression. The apparatus also includes pipe lines communicating the two chambers with each other through a check valve, a gas supplying conduit pipe connected upstream of the check valve, and a conduit pipe connecting the chamber located downstream of the check valve to the cavity, wherein the piston is reciprocated to perform two-stage compression to provide a high pressure gas as required.

公开(公告)号：US4121748A

公开(公告)日：1978-10-24

申请号：US674558

申请日：1976-04-07

申请人： Takao Yokokawa ,  Shigeo Takano ,  Yasuaki Ichinose ,  Toshiyuki Kasahara ,  Fumiaki Ikeda

发明人： Takao Yokokawa ,  Shigeo Takano ,  Yasuaki Ichinose ,  Toshiyuki Kasahara ,  Fumiaki Ikeda

IPC分类号： B23K5/00 ,  B23K19/00

CPC分类号： B23K5/00

摘要： In an automatic gas pressure welding system wherein a couple of steel members are butted, the butted section is subjected to heating in a pressed state, to thus cause the steel members to be subjected to pressure welding. The pressing and heating periods are controlled in conformity with the amount of contraction of the heated section of the steel members.

摘要翻译： 在其中一对钢构件对接的自动气体压力焊接系统中，对接部分在加压状态下受到加热，从而使钢构件经受压力焊接。 按照加热部分的收缩量来控制加压和加热周期。

公开(公告)号：US4103815A

公开(公告)日：1978-08-01

申请号：US765748

申请日：1977-02-04

申请人： Takao Yokokawa ,  Shigeo Takano ,  Yasuaki Ichinose ,  Toshiyuki Kasahara ,  Fumiaki Ikeda

发明人： Takao Yokokawa ,  Shigeo Takano ,  Yasuaki Ichinose ,  Toshiyuki Kasahara ,  Fumiaki Ikeda

IPC分类号： B23K5/00 ,  B23K19/00

CPC分类号： B23K5/00

摘要： In an automatic gas pressure welding system wherein a couple of steel members are butted, the butted section is subjected to heating in a pressed state, to thus cause the steel members to be subjected to pressure welding. The pressing and heating periods are connected in conformity with the amount of contraction of the heated section of the steel members.

摘要翻译： 在其中一对钢构件对接的自动气体压力焊接系统中，对接部分在加压状态下受到加热，从而使钢构件经受压力焊接。 加压和加热周期与钢构件的加热部分的收缩量相一致。