Precision-casting core, precision-casting core manufacturing method, and precision-casting mold

Patent metadata

Field	Value
Publication number	US-2016101462-A1
Application number	US-201414893101-A
Country	US
Kind code	A1
Filing date	May 28, 2014
Priority date	May 29, 2013
Publication date	Apr 14, 2016
Grant date	—

Abstract

A coating layer including solely silicon alkoxide or mixed alkoxide of silicon alkoxide and aluminum alkoxide is formed on a surface of a sintered precision-casting core body mainly including silica particles so as to seal holes formed in the surface. As a result, it is possible to prevent the breakage of the core during casting.

First claim

1 . A precision-casting core obtained by forming a coating layer of two kinds of silica materials having different particle diameters on a surface of a sintered precision-casting core body mainly including silica particles.

2 . The precision-casting core according to claim 1 ,
wherein two kinds of silica materials having different particle diameters comprise silica sol and silica fume.

3 . (canceled)

4 . A precision-casting core obtained by forming a coating layer including a silica material, an alumina material, and silica fume on a surface of a sintered precision-casting core body mainly including silica particles.

5 . The precision-casting core according to claim 4 ,
wherein the silica material is silica sol and the alumina material is alumina sol. 6 . (Currently Amended) A precision-casting mold used to manufacture cast metal, comprising: a precision-casting core obtained by forming a coating layer of two kinds of silica materials having different particle diameters on a surface of a sintered precision-casting core body mainly including silica particles having a shape corresponding to a cavity inside the cast metal; and an outer mold corresponding to the shape of the outer peripheral surface of the cast metal.

7 . A precision-casting core manufacturing method comprising:
immersing a sintered body of a precision-casting core body mainly including silica particles into a coating material including two kinds of silica materials having different particle diameters; drying the sintered body; and heating the sintered body so as to form a coating layer on the surface of the precision-casting core body.

8 . The precision-casting core manufacturing method according to claim 7 ,
wherein two kinds of silica materials having different particle diameters include silica sol and silica fume.

9 . (canceled)

10 . A precision-casting core manufacturing method comprising:
immersing a sintered body of a precision-casting core body mainly including silica particles into a coating material including a silica material, an alumina material and silica fume; drying the sintered body; and heating the sintered body so as to form a coating layer on the surface of the precision-casting core body.

11 . The precision-casting core manufacturing method according to claim 10 ,
wherein the silica material is silica sol and the alumina material is alumina sol.

12 . The precision-casting mold according to claim 6 ,
wherein the silica material is silica sol and the alumina material is alumina sol.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Oguma Hidetaka
• Mori Kazutaka
• Okada Ikuo
• Shimohata Sachio

Classifications

• B22C9/24

  for hollow articles · CPC title

• B22C9/10 Primary

  Cores; Manufacture or installation of cores {(breaker cores B22C9/084)} · CPC title

• B22C9/04

  Use of lost patterns · CPC title

• B22C3/00

  Selection of compositions for coating the surfaces of moulds, cores, or patterns · CPC title

• B22C9/12

  Treating moulds or cores, e.g. drying, hardening · CPC title