초록 ▼

A movable mold is disposed so as to face the stationary mold and to be advanceable and retractable. The movable mold forms a cavity in cooperation with the stationary mold when mold clamping is performed. A sprue is disposed to face the cavity and has a concave portion formed at a front end thereof.

A movable mold is disposed so as to face the stationary mold and to be advanceable and retractable. The movable mold forms a cavity in cooperation with the stationary mold when mold clamping is performed. A sprue is disposed to face the cavity and has a concave portion formed at a front end thereof. A cut punch is reciprocatively disposed to face the cavity at a position corresponding to the concave portion. The cut punch enters the concave portion when advanced. A drive section is provided to advance and retract the cut punch when driven. A controller drives the drive section such that during the mold clamping, the cut punch is advanced at a predetermined extension force in order to perform gate cutting and such that the extension force is made no greater than a preset value before the mold is opened.

대표청구항 ▼

1. A gate cut method for a disc molding apparatus, comprising the steps of:(a) pressing a first mold against a second mold to thereby perform mold clamping and to thereby form a cavity; (b) generating an extension force on a drive section and advancing a cut punch into the cavity, while the mold cla

1. A gate cut method for a disc molding apparatus, comprising the steps of:(a) pressing a first mold against a second mold to thereby perform mold clamping and to thereby form a cavity; (b) generating an extension force on a drive section and advancing a cut punch into the cavity, while the mold clamping is performed, to thereby cut a portion of a molded product within the cavity; and (c) reducing an extension force of said drive section and said cut punch such that the extension force is no greater than the predetermined extension force before and when the mold is opened; and (d) opening the mold.