| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that oil pressure is used for driving an upper part so that the temperature of oil is changed by external factors such as weather and temperature to make a driving action unstable. SOLUTION: The injection of a resin is started at a point C during resin molding, in the process of mold clamping to a point D, while positions from the point C to the point D are controlled by a servo-motor 18 which drives the upper part 12, an internal pressure generated between the surfaces of an upper mold 13 and a lower mold 14, by using the pressure control of the servo- motor 18, a resin molding of constant quality can be produced, and a molding time can be made approximately constant. By applying a balancer cylinder part 10 which supports the upper part 12, more stabilized pressure control can be materialized.
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