EXTRUSION CASTING METHOD OF WORKPIECE

WIPO Patent Application WO/2018/053939

A1

An extrusion casting method of a workpiece. The method comprises the following steps: pre-heating a mold and pouring a molten material into a forming cavity of the mold; an upper mold (610) moving downwards to a lower mold (620) to close the mold, a first extrusion punch (611) then performing extrusion on the molten material of a first portion, and a second extrusion punch (612) performing extrusion on the molten material of a second portion; the first extrusion punch (611) and the second extrusion punch (612) continuing to move downwards, increasing the extrusion pressure exerted on the molten material by the first extrusion punch (611) and second extrusion punch (612) to f1, and sustaining the pressure for a duration of t1; the second extrusion punch (612) continuing to move downwards, and increasing the extrusion pressure exerted by the second extrusion punch (611) on the molten material of the second portion, wherein the extrusion pressure exerted by the second extrusion punch (611) is increased to f2 and sustained for a duration of t2, where f2 > f1; and opening the mold to eject a workpiece. The method applies a two-stage direct extrusion along the same direction on the workpiece, and performs, according to a solidification sequence of a workpiece, a two-stage pressing action in separate stages while the workpiece solidifies. The invention improves pressure distribution, product quality, and yield.

JPH07110403	INDUSTRIAL APPLICABILITY: Split sprue type pressure casting apparatus
JPH06114527	METHOD FOR CONTROLLING MOLTEN METAL SUPPLYING QUANTITY IN CASTING MACHINE
JPS5828690	[Title of the device] A positioning device of the metallic mold in a vertical die forming machine

ZHU QUANLI (CN)
CHEN JIAJIAN (CN)
LI YUANYUAN (CN)
ZHANG WEIWEN (CN)
WU ZIYONG (CN)

PCT/CN2016/108278

March 29, 2018

December 01, 2016

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UNIV SOUTH CHINA TECH (CN)
GUANGDONG YUEHAI HUAJIN TECH CO LTD (CN)

B22D18/02

CN203649367U	2014-06-18
CN205289707U	2016-06-08
CN201147834Y	2008-11-12
CN103192056A	2013-07-10
CN103551543A	2014-02-05
JPS54112766A	1979-09-03
RU2459683C1	2012-08-27

ADVANCE CHINA IP LAW OFFICE (CN)

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