| 摘要 |
There is disclosed a thermosetting resin injection molding machine comprising: a heating cylinder including a body having a device for introducing a resin material into said body, and a sleeve having an injection port for injecting the resin material; and a screw reciprocally movable in the heating cylinder, wherein the screw includes a body having a flight, and a piston portion provided at a front end of the screw body, and a diameter of the piston portion is smaller than a diameter of the flight; wherein an inner diameter of a working portion of the sleeve is smaller than an inner diameter of the heating cylinder body; wherein a length of the piston portion, a length of the working portion of the sleeve and an annular clearance between the working portion of the sleeve and the piston portion are so determined that a predetermined amount of the resin can remain for cushion molding at a front end of the piston portion during dwell after the injection of the resin material; and wherein a resin compressing portion is interposed between the piston portion and the screw body, and the resin compressing portion has a diameter which is larger than the diameter of the piston portion, and is smaller than the diameter of the flight.
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