초록 ▼

A pre-molded part is formed by pre-molding an insert with a pre-molded member, and then the pre-molded part is inserted into an over-molded member composed of thermo plastic resin. After applying a heat treatment with a temperature lower than a crystalline melting point of the pre-molded part to the

A pre-molded part is formed by pre-molding an insert with a pre-molded member, and then the pre-molded part is inserted into an over-molded member composed of thermo plastic resin. After applying a heat treatment with a temperature lower than a crystalline melting point of the pre-molded part to the pre-molded part surrounding the insert, a firm contact between the insert and the resin surrounding the insert without a gap at the interface between those parts is obtained.

대표청구항 ▼

1. A production method of a composite molded part comprising: providing a pre-molded member consisting essentially of thermoplastic resin having crystallinity,subsequently forming at least one pre-molded part by pre-molding at least one insert member consisting essentially of metal, ceramic, resin,

1. A production method of a composite molded part comprising: providing a pre-molded member consisting essentially of thermoplastic resin having crystallinity,subsequently forming at least one pre-molded part by pre-molding at least one insert member consisting essentially of metal, ceramic, resin, or a combination of those materials with the pre-molded member,applying heat treatment to a surrounding pre-molded member of said pre-molded part at a temperature of from 130° C. to 170° C. lower than a crystalline melting point of said pre-molded part of from 220° C. to 270° C. for about one hour, and then applying an insert molding process to an over-molding member to insert said pre-molded part, which has been cooled, solidified, and molded, into the over-molding member, andover-molding said at least one pre-molded part with an over-molded member consisting essentially of thermoplastic resin to form the composite molded part. 2. The production method of claim 1, wherein said at least one insert member is at least one metallic terminal to be used for electrical connection. 3. The production method of claim 1, wherein said pre-molded part includes plural insert members, and the pre-molded part is inserted and molded together with said over-molded part. 4. The production method of claim 1, wherein said pre-molded part includes plural insert members, and said at least one pre-molded part is one of plural pre-molded parts that are overlapped, inserted, and molded together with said over-molded member. 5. The production method of claim 1, wherein said pre-molded member and said over-molded member consist essentially of the same filled resin. 6. The production method of claim 5, wherein an amount of filler in said pre-molded part is equal to an amount of filler in said over-molded member. 7. The production method of claim 5, wherein said pre-molded member consists essentially of a resin with a filler fraction higher than that of said over-molded member. 8. The production method of composite molding part according to claim 1, wherein both said pre-molded member and said over-molded member consist essentially of a resin filled with filler, and said pre-molded member consists essentially of a resin with a crystalline melting point higher than that of said over-molded member. 9. The production method of composite molding part according to claim 1, wherein said pre-molded member and said over-molded member consist essentially of a filled resin, and said pre-molded member consists essentially of a resin with a crystalline melting point lower than that of said over-molded member. 10. An electronic part formed by the production method according to claim 1, wherein a gap that remains at an interface between said at least one insert member and said pre-molded member after applying said heat treatment is narrower than a gap generated at an interface between said pre-molded part and said over-molded member after forming the composite molded part.