Resin molding process and resin-molding mold device
AssigneeKabushiki Kaisha Honda Lock
InventorYuuichirou Noda
Life of this patent
Estimating the term…
Abstract
A resin-molding mold device is provided for carrying out the resin molding process to mold the resin molded article, wherein when cooling after charging a molten synthetic resin into a cavity (14) and maintaining the pressure, a movable core (11) is urged to the side in which the capacity of the cavity (14) is decreased. This enables a resin molded article having a proper shape to be reliably molded by preventing a design surface from parting from a cavity wall surface when die-molding the resin molded article by charging a molten synthetic resin into a cavity formed from a plurality of dies.
Claims10
A resin molding process for die-molding a resin molded article by charging a molten synthetic resin into a cavity formed from a plurality of dies, comprising the steps of:
- providing a first die having a design surface facing the cavity;
- providing a movable core having a molding surface forming at least part of a non-design surface on the side opposite the design surface of the molded resin article, wherein the movable core moves relative to a movable core support and wherein the movable core is biased toward the first die;
- moving the movable core support and the movable core to a position toward the first die;
- charging the molten synthetic resin into the cavity, wherein the molten resin moves the movable core in a direction opposite the first die;
- moving the movable core support in a direction opposite the first die, while continuing to bias the movable core toward the side on which the capacity of the cavity is decreased, when cooling after charging the molten synthetic resin into the cavity.
A resin-molding mold device for carrying out a resin molding process so as to mold the resin molded article, the device comprising:
- a movable core support;
- a movable core;
- and
- resilient means,
- wherein the movable core support is capable of moving between a forward position in which the movable core support is close to the cavity side and a backward position in which the movable core support core is separated from the forward position by a fixed distance toward the side on which the movable core support is separated from the cavity and is capable of switching between the forward position when charging the molten synthetic resin into the cavity and maintaining the pressure and the backward position when cooling the molten synthetic resin,
- wherein the movable core has a molding surface forming at least part of the non-design surface on the side opposite to the design surface of the resin molded article and is supported on the movable core support so that the movable core can move restrictedly relative to the movable core support in the same direction as the direction of movement of the movable core support, and
- wherein the resilient means are provided between the movable core and the movable core support so as to exhibit an urging force resiliently urging the movable core toward the side on which the capacity of the cavity is decreased with a spring load that is smaller than a load acting on the movable core due to molten synthetic resin being charged into the cavity.
Dependencies are inferred from the claim text.