Method of producing mold for slip casting and method of molding slip casting
AssigneeHitachi, Ltd.
InventorsTatsuo Natori, Takashi Shimaguchi, Toshihiro Yamada, Kazuaki Yokoi
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Abstract
A mold forming method in which a pattern is made of an organic material such as foamed polystyrene and at least a portion of the outer or inner surface of the mold pattern is covered by a thin coating, and surrounded with a mold material. The pattern is then dissolved by a solvent, leaving the coating undissolved. The coating is finally removed by a solvent contained in a slip which is poured into the cavity provided with the coating.
Claims29
A method of producing a mold having a cavity for slip casting comprising the steps of:
- preparing a pattern made of an organic material soluble in a predetermined solvent A;
- providing a coating on at least a portion of the surface of said pattern, which coating is made of material soluble in another predetermined solvent B, wherein said solvent B is at least one material selected from the group consisting of water, alcohol, and acetone, but insoluble in said solvent A;
- surrounding said pattern and said coating with a molding material;
- contacting said pattern with said solvent A so as to contract said pattern;
- and
- removing the material of said pattern to the outside of said molding material;
- thereby forming a mold cavity;
- wherein said mold material contains a binder soluble in said solvent B.
A method of producing a mold for slip casting comprising the steps of:
- preparing a pattern made of an organic material soluble in a predetermined organic solvent;
- forming a coating on at least a portion of the surface of said pattern, which coating is made of a material soluble in water, but insoluble in said organic solvent;
- surrounding said pattern and said coating with a molding material, said molding material containing a binder soluble in water;
- contacting said pattern with said organic solvent so as to contract said mold pattern;
- and removing the pattern to the outside of said molding material, thereby forming a mold cavity.
A method of producing a mold for slip casting comprising the steps of:
- preparing a pattern of a female mold, which pattern is made of an organic material soluble in a predetermined solvent A;
- providing a coating on at least a portion of the internal surface of said female mold pattern, which coating is made of a material soluble in another predetermined solvent B, wherein said solvent B is at least one material selected from the group consisting of water, alcohol, and acetone, but insoluble in said solvent A;
- filling an inner portion of said pattern with a molding material;
- contacting said pattern with said solvent A so as to contact said pattern;
- and
- removing the material of said pattern to thereby form a male mold;
- wherein said mold material contains a binder soluble in said solvent B.
A slip casting method comprising the steps of:
- preparing a pattern made of an organic material soluble in a predetermined organic solvent;
- providing a coating on at least a portion of the surface of said pattern, which coating is made of a material soluble in water, but insoluble in and impermeable to said organic solvent;
- surrounding said pattern and said coating with a mold material, said mold material containing a binder soluble to water;
- contacting said pattern with said organic solvent so as to contract said pattern;
- removing the material of said pattern to the outside of said mold the thereby form a mold cavity;
- supplying a slip containing water so that said slip is solidified while dissolving said coating and making said mold material easily collapsible;
- and extracting slip-cast product while collapsing and removing said mold material.
A method of producing a mold for slip casting, comprising the steps of:
- preparing a pattern made of an organic material soluble in a predetermined solvent A;
- providing a coating on at least a portion of the surface of said pattern, which coating is made of a material soluble in water, but insoluble in the solvent A;
- surrounding said pattern and said coating with a mold material so as to form a mold, said mold material being a slurry containing inorganic powder as an aggregate, gypsum as a binder, and water;
- contacting said pattern with said solvent A after hardening of said molding material so as to contract said pattern;
- and removing said pattern to the outside of said molding material to thereby form a mold cavity.
Dependencies are inferred from the claim text.