Claims
- 1. A mold comprising a cavity for defining the shape of a casting and a mold body for forming said cavity, comprising:
- a mold body formed of an ordinary temperature setting resin or thermosetting resin and casting sand, said mold body having depressions in the surface thereof, said depressions at least in the surface thereof on the cavity side being filled up with a powdered gum reducing substance having a particle diameter of 200 .mu.m or less selected from the group consisting of hydrous magnesium silicate clay mineral having a specific surface area of 100 m.sup.2 /g to 400 m.sup.2 /g, activated carbon having a specific surface area of 400 m.sup.2 /g to 2000 m.sup.2 /g and activated alumina having a specific surface area of 50 m.sup.2 /g to 400 m.sup.2 /g, in an amount sufficient to reduce gum generation and to prevent metal penetration into said depressions during casting, thereby providing the mold body with smooth surfaces while reducing gum generation.
- 2. The mold of claim 1, wherein said gum reducing substance has a particle diameter of from 1 to 100 micrometers.
- 3. A mold comprising a cavity for defining the shape of a casting and a mold body for forming said cavity, comprising:
- a mold body formed of an ordinary temperature setting resin or thermosetting resin and casting sand, said mold body having depressions in the surfaces thereof, said depressions at least in the surface thereof on the cavity side being filled up with a powdered gum reducing mixture having a particle diameter of 200 .mu.m or less of hydrous magnesium silicate clay mineral having a specific surface area of 100 m.sup.2 /g to 400 m.sup.2 /g and activated carbon having a specific surface area of 400 m.sup.2 /g to 2000 m.sup.2 /g, in an amount sufficient to reduce gum generation and to prevent metal penetration into said depressions during casting, thereby providing the mold body with smooth surfaces while reducing gum generation.
Priority Claims (3)
Number |
Date |
Country |
Kind |
62-222646 |
Sep 1987 |
JPX |
|
62-233575 |
Sep 1987 |
JPX |
|
63-017578 |
Jan 1988 |
JPX |
|
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of Ser. No. 07/753,030, filed on Aug. 26, 1991, now abandoned, which is a continuation of Ser. No. 07/506,457 filed Apr. 9, 1990 now abandoned which is a continuation-in-part of 07/238,848 filed Sep. 1, 1988 which is now U.S. Pat. No. 4,934,440.
US Referenced Citations (3)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2559691 |
Aug 1985 |
FRX |
1184908 |
Mar 1970 |
GBX |
2124116 |
Feb 1984 |
GBX |
Continuations (2)
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Number |
Date |
Country |
Parent |
753030 |
Aug 1991 |
|
Parent |
506457 |
Apr 1990 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
238848 |
Sep 1988 |
|