Abstract A method of producing a pattern for use in the manufacture of a mold which is adapted to be cured by microwave irradiation. The method comprises forming a rolled-over male pattern, forming a rolled-over female pattern having a scale-off layer along a boundary thereof with the male pattern, removing the scale-off layer, pouring a silicone RTV rubber into a cavity of the female pattern to form a match plate therein, setting a metallic frame on the match plate, filling the interior of the metallic frame with a mixture of microwave-pervious resin and dry silica sand, causing the mixture to be thermally cured thereby forming a reinforcing layer on the peripheral surface of the match plate, placing the male pattern within the reinforcing layer after removing the match plate therefrom, and injecting a microwave-pervious silicone rubber into the gap formed between the reinforcing layer and the male pattern thereby forming a mold defining layer on the inner surface of the reinforcing layer.
Inventors
👤 Kan-ichi Sato
👤 Akio Yamanishi
👤 Takashi Higashino
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-02 23:45
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
183 words
A method of producing a pattern for use in the manufacture of a mold, comprising the steps of: (a) forming a rolled-over male pattern by using a wooden pattern; (b) forming a rolled-over female pattern having a thin-walled scale-off layer along a boundary thereof with said rolled-over male pattern by using the latter; (c) removing the thin-walled scale-off layer from said rolled-over female pattern; (d) pouring a silicone RTV rubber into a cavity of said rolled-over female pattern to form a match plate therein; (e) setting a metallic frame on said match plate; (f) filling the interior of the metallic frame with a mixture of microwave-pervious resin and silica sand; (g) causing said mixture to be thermally cured thereby forming a reinforcing layer on the peripheral surface of said match plate; (h) placing said rolled-over male pattern within said metallic-frame-supported reinforcing layer after removing said match plate therefrom; and (i) injecting a microwave-pervious and heatproof material into the gap formed between said reinforcing layer and said rolled-over male pattern thereby forming a mold defining layer on the inner surface of said reinforcing layer.
Claim 2
Independent Claim
183 words
A method of producing a pattern for use in the manufacture of a mold, comprising the steps of: (a) forming a rolled-over male pattern by using a wooden pattern; (b) forming a rolled-over female pattern having a thin-walled scale-off layer along a boundary thereof with said rolled-over male pattern by using the latter; (c) removing the thin-walled scale-off layer from said rolled-over female pattern; (d) pouring a silicone RTV rubber into a cavity of said rolled-over female pattern to form a match plate therein; (e) setting a metallic frame on said match plate; (f) filling the interior of the metallic frame with a mixture of microwave-pervious resin and silica sand; (g) causing said mixture to be thermally cured thereby forming a reinforcing layer on the peripheral surface of said match plate; (h) placing said rolled-over male pattern within said metallic-frame-supported reinforcing layer after removing said match plate therefrom; and (i) injecting a microwave-pervious and heatproof material into the gap formed between said reinforcing layer and said rolled-over male pattern thereby forming a mold defining layer on the inner surface of said reinforcing layer.
Claim 3
Dependent Claim
42 words
A method of producing a pattern according to claim 1 wherein said reinforcing layer is made of a material comprising a mixture of nonpolar epoxy resin and silica sand and wherein said mold defining layer is made of silicone rubber or fluororubber.