| 摘要 |
PURPOSE:To obtain a molding faithful to a mold by a method wherein the length, the size or the coefficient of elasticity of a tie bar are considered to mold while applying the elastic deformation restoring force of the tie bar into the direction of the thickness of the molding upon cooling the molded form. CONSTITUTION:A motor 1 and a spiral screw 2 are provided with sufficient rigidity to absorb all of a pressure applied on a movable disc 3 upon mold clamping by the elongation of a tie bar 8. The opening DELTAL of a mold, caused by the deformation of the mold due to secondary injection pressure, is stored as the form of the energy of the elongation of the tie bar. Thereafter, the elastic deformation restoring force of the tie bar 8, elongated into the direction of the thickness of a disc, is exerted in accordance with the advance of the cooling of the molded disc whereby a clearance between a movable mold 4 and a fixed mold 5 is reduced. Compressing operation is started immediately after gate seal, therefore, a molded form, very faithful to the mold, may be molded. |
