US 4,535,831 AGranted

Pattern for producing a mold and method for manufacture of the pattern

AssigneeKabushiki Kaisha Komatsu Seisakusho

InventorsKan-ichi Sato, Akio Yamanishi, Takashi Higashino

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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.

Claims2

Dependent claims

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.

7 more elements

Dependencies are inferred from the claim text.