Method of extrusion forming

Patent metadata

Field	Value
Publication number	US-8939001-B2
Application number	US-201013265136-A
Country	US
Kind code	B2
Filing date	Apr 16, 2010
Priority date	Apr 20, 2009
Publication date	Jan 27, 2015
Grant date	Jan 27, 2015

Abstract

In an extrusion molding method, a discard 7 is pressed in the thickness direction with a stem 2 after releasing the restraint of the external peripheral surface of the discard 7 by the container 1 or while releasing the restraint to thereby reduce the thickness of the discard 7 , and then the discard 7 is cut off with a shearing blade 4.

First claim

The invention claimed is:

1. A direct extrusion molding method comprising:
an extruding step for obtaining an extruded member by pressing a billet loaded in a container with a stem in an extrusion direction to press the billet against an extrusion die arranged at a downstream side of the container;
a discard thickness reduction step for reducing a thickness of a discard by pressing the discard between the stem and the extrusion die in a thickness direction of the discard to reduce the thickness of the discard by plastically deforming the discard with the stem after releasing restraint of an external peripheral surface of the discard by the container or while releasing the restraint; and
a discard shearing step for shearing the discard with a shearing blade after the discard thickness reduction.

2. The direct extrusion molding method as recited in claim 1 , further comprising:
a new billet press-bonding step for press-bonding a new billet mounted in the container to a remained extruding material in the extrusion die after the discard shearing step; and
an extrusion molding resuming step for resuming extrusion molding after the new billet press-bonding step.

3. The direct extrusion molding method as recited in claim 1 , wherein the thickness of the discard is reduced so as to fall within a range of 10 to 30 mm at the discard thickness reduction step.

4. The direct extrusion molding method as recited in claim 1 , wherein the direct extrusion molding method is a direct extrusion molding method of aluminum alloy, and wherein a temperature of the discard is within a range of 400 to 520° C. at the discard thickness reduction step.

5. A production method of a raw tube for a photoconductive drum substrate characterized in that after executing the direct extrusion molding method as recited in claim 1 , the extruded member obtained by the direct extrusion molding method is subjected to a drawing process to produce an extruded tube.

6. A direct extrusion molding device comprising:
a stem configured to press a billet arranged in a container in an extrusion direction;
a shearing blade configured to shear a discard of the billet, and
an extrusion die arranged at a downstream side of the container,
wherein the stem is configured to press the discard in a thickness direction of the discard between the stem and the extrusion die to plastically deform the discard so that a thickness of the discard is reduced after releasing a restraint of an external peripheral surface of the discard by the container or while releasing the restraint.

Assignees

• Momo Yoichi
• Kaneko Denjiro
• Showa Denko Kk

Inventors

• Momo Yoichi
• Kaneko Denjiro

Classifications

• B21C35/04 Primary

  Cutting-off or removing waste · CPC title

• G03G5/10

  Bases for charge-receiving or other layers · CPC title

• G03G5/102

  consisting of or comprising metals · CPC title

• G03G2215/00957

  Compositions · CPC title