Injection molding method and injection molding machine
AssigneeSumitomo Heavy Industries, Ltd.
InventorIchiro Sakamoto
Life of this patent
Estimating the term…
Abstract
An injection molding machine may include a split mold where a gas discharge portion is formed at parting surfaces. Further, the cross-section of a flow passage of the gas discharge portion may be reduced at a predetermined timing after the start of the filling of a molding material. Since the cross-section of the flow passage of the gas discharge portion is reduced after a cavity space starts being filled with a molding material, it may be possible to make the amount of gas, which flows through the gas discharge portion, large until the cross-section of the flow passage of the gas discharge portion is reduced. It may be possible to prevent a foreign material from adhering to the inner peripheral surface of the gas discharge portion.
Claims6
An injection molding method of an injection molding machine which comprises a split mold divided into a plurality of mold members in a circumferential direction, said method comprising:
- reducing a cross-section of a flow passage of a gas discharge portion formed at mating faces of the mold members at a predetermined timing after a start of a filling of a molding material,
- wherein the mating faces of the mold members are configured to move in a direction perpendicular to a closing direction of the injection molding machine.
An injection molding machine comprising:
- a split mold divided into a plurality of mold members in a circumferential direction and where a gas discharge portion is formed at mating faces of the mold members;
- and
- a controller that controls the operation of the split mold,
- wherein the controller includes a flow passage cross-section changing processing unit that reduces the cross-section of a flow passage of the gas discharge portion at a predetermined timing after the start of the filling of a molding material, and
- wherein the mating faces of the mold members are configured to move in a direction perpendicular to a closing direction of the injection molding machine.
Dependencies are inferred from the claim text.