Method for manufacturing sintered component and sintered component

Patent metadata

Field	Value
Publication number	US-11097342-B2
Application number	US-201515535282-A
Country	US
Kind code	B2
Filing date	Dec 8, 2015
Priority date	Dec 12, 2014
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

Provided is a method for manufacturing a sintered component having a hole formed therein, in which a sintered component having no defect, such as cracks, can be manufactured with good productivity and also a reduction in tool life accompanied by forming the hole can be suppressed. The method for manufacturing a sintered component includes a molding step of press-molding a raw material powder containing a metal powder and thus fabricating a green body; a drilling step of forming a hole in the green body using a candle-type drill and thus forming a thin-walled portion, of which a thickness Gt as measured between an inner circumferential surface of the hole and an outer surface of the green body is smaller than a diameter Gd of the hole; and a sintering step of sintering the green body after the drilling step.

First claim

The invention claimed is:

1. A method for manufacturing a sintered component, comprising:
a molding step of press-molding a raw material powder containing a metal powder and thus fabricating a green body;
a drilling step of forming a hole in a side of the green body using a candle-type drill in which a center of a point portion is of a candle shape, an angle between straight lines connecting the center of the point portion with both outer ends of a cutting edge is in the order of 140° or more and 220° or less, and recesses are formed between the center and the outer ends, and thus forming a thin-walled portion, of which a thickness Gt as measured between an inner circumferential surface of the hole and an outer surface of the green body is smaller than a diameter Gd of the hole; and
a sintering step of sintering the green body after the drilling step.

2. The method according to claim 1 , wherein the thickness Gt of the thin-walled portion is Gd/5 or more and Gd/2 or less.

3. The method according to claim 2 , wherein Gl is Gd or more, where the Gl is an axial length of the hole.

4. The method according to claim 1 , wherein Gl is Gd or more, where the Gl is an axial length of the hole.

5. The method according to claim 1 , wherein the hole is a through-hole passing through the side of the green body.

6. The method according to claim 1 , wherein an axial direction of the hole is perpendicular to an axial direction of the green body.

Assignees

• Sumitomo Electric Sintered Alloy Ltd

Inventors

• Sonoda Yasunori
• Take Ryota

Classifications

• B22F1/105

  containing inorganic lubricating or binding agents, e.g. metal salts · CPC title

• B22F2003/245

  Making recesses, grooves etc on the surface by removing material · CPC title

• C22C38/18

  containing chromium · CPC title

• C22C38/22

  with molybdenum or tungsten · CPC title

• C22C38/44

  with molybdenum or tungsten · CPC title