Title:
【発明の名称】金属材料の射出成形方法
Document Type and Number:
Japanese Patent JP3337135
Kind Code:
B2
Abstract:
An injection molding method of a metal material in a liquid phase state, by which the material can be transferred, metered, and deaerated smoothly by operating the movement and rotation of the screw. After injection, retraction resistance made of the metal material that went into a clearance between the heating cylinder and screw flights is removed in advance by rotating the screw for a set number of times at a forward position. Then, the metal material in the liquid phase state is accumulated in a front chamber by forcing the screw to retract for a set distance, and applying a back pressure to the screw rotating at a retraction position, thereby starting transfer of the metal material. Subsequently, the rotation of the screw is stopped, whereupon the accumulation is completed. Then, the accumulated metal material is pressed by moving the screw forward. Injection is effected only when a material pressure reaches a set pressure within a preset forward distance of the screw, whereupon metering is assumed to have been completed.
Inventors:
Takahiro Kobayashi
Mamoru Miyakawa
Mamoru Miyakawa
Application Number:
JP27935199A
Publication Date:
October 21, 2002
Filing Date:
September 30, 1999
Export Citation:
Assignee:
Nissei Plastic Industry Co., Ltd.
International Classes:
B22D17/20; B22D17/30; B22D17/32; (IPC1-7): B22D17/20; B22D17/30; B22D17/32
Domestic Patent References:
| JP10664A | ||||
| JP7155918A |
Attorney, Agent or Firm:
Teruo Akimoto