Transfer molding method and transfer molding machine
First Claim
1. A method of transfer molding comprising the steps of:
- (a) charging thermosetting resin into a mold having at least one runner and at least one cavity by applying pressure to the resin by a plunger;
(b) sensing the resin pressure in said mold by a resin pressure sensor; and
(c) controlling the pressure applied to the plunger during step (a) by applying a selected primary pressure to said plunger for driving said plunger until the pressure sensed in step (b) reaches a predetermined level and directly switching the pressure applied to the plunger to a secondary holding pressure that is lower than said primary pressure for driving said plunger upon said predetermined level being reached.
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Accused Products
Abstract
A transfer molding machine for filling at least one cavity of a mold with a resin by means of a plunger including a resin pressure sensor for sensing the resin pressure in the mold, and a control device for controlling the pressure applied to the plunger to drive same in such a manner that an arbitrarily selected primary pressure higher than a holding pressure is applied to the plunger to drive same until the pressure of the resin charged into the mold which pressure is detected by the resin pressure sensor in the mold reaches a predetermined pressure level and a secondary pressure corresponding to the holding pressure is applied to the plunger to drive same after the predetermined pressure level has been exceeded by the pressure of the resin being charged into the mold sensed by the resin pressure sensor in the mold, and a warning device that issues a warning when the pressure applied to the plunger to drive has exceeded a predetermined pressure.
36 Citations
6 Claims
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1. A method of transfer molding comprising the steps of:
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(a) charging thermosetting resin into a mold having at least one runner and at least one cavity by applying pressure to the resin by a plunger; (b) sensing the resin pressure in said mold by a resin pressure sensor; and (c) controlling the pressure applied to the plunger during step (a) by applying a selected primary pressure to said plunger for driving said plunger until the pressure sensed in step (b) reaches a predetermined level and directly switching the pressure applied to the plunger to a secondary holding pressure that is lower than said primary pressure for driving said plunger upon said predetermined level being reached. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification