US 11,813,668 B2
Die casting machine
Makoto Tsuji, Kanagawa (JP); Yuto Hayashi, Kanagawa (JP); and Saburo Noda, Kanagawa (JP)
Assigned to SHIBAURA MACHINE CO., LTD., Tokyo (JP)
Filed by SHIBAURA MACHINE CO., LTD., Tokyo (JP)
Filed on Jan. 12, 2022, as Appl. No. 17/574,153.
Application 17/574,153 is a continuation of application No. PCT/JP2020/018083, filed on Apr. 28, 2020.
Claims priority of application No. 2019-136121 (JP), filed on Jul. 24, 2019.
Prior Publication US 2022/0134417 A1, May 5, 2022
Int. Cl. B22D 17/32 (2006.01); B22D 17/20 (2006.01); B29C 45/53 (2006.01)
CPC B22D 17/32 (2013.01) [B22D 17/203 (2013.01); B29C 45/53 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A die casting machine comprising:
a base;
a fixed die plate fixed onto the base and holding a fixed die;
a movable die plate provided on the base, the movable die plate configured to move in a mold opening and closing direction, and the movable die plate holding a movable die to face the fixed die;
an injection device configured to fill a molten metal into a cavity formed by the fixed die and the movable die, and the injection device configured to apply a first pressure to the molten metal, the injection device comprising:
an injection sleeve connected to the cavity,
an injection plunger slidably disposed in the injection sleeve and configured to apply the first pressure to the molten metal,
an injection actuator configured to move the injection plunger, and
a first liquid pressure circuit configured to drive the injection actuator, wherein the first liquid pressure circuit includes a first valve configured to control a flow of a first hydraulic liquid flowing in the first liquid pressure circuit and a first accumulator configured to increase a flow rate of the first hydraulic liquid;
a first pressurizing device configured to pressurize the molten metal filled in the cavity in a region other than a product region of the cavity and configured to apply a second pressure to the molten metal, the first pressurizing device comprising:
a first pressurizing plunger configured to apply the second pressure to the molten metal,
a first pressurizing actuator configured to move the first pressurizing plunger, and
a second liquid pressure circuit configured to drive the first pressurizing actuator, wherein the second liquid pressure circuit includes a second valve configured to control a flow of a second hydraulic liquid flowing in the second liquid pressure circuit and a second accumulator configured to increase a flow rate of the second hydraulic liquid; and
a control device configured to control the first pressurizing device so that the second pressure becomes higher than the first pressure.
 
9. A die casting machine comprising:
a base;
a fixed die plate fixed onto the base and holding a fixed die;
a movable die plate provided on the base, the movable die plate configured to move in a mold opening and closing direction, and the movable die plate holding a movable die to face the fixed die;
an injection device configured to fill a molten metal into a cavity formed by the fixed die and the movable die, and the injection device configured to apply a first pressure to the molten metal, the injection device comprising:
an injection sleeve connected to the cavity,
an injection plunger slidably disposed in the injection sleeve and configured to apply the first pressure to the molten metal,
an injection actuator configured to move the injection plunger, and
a first liquid pressure circuit configured to drive the injection actuator;
a first pressurizing device configured to pressurize the molten metal filled in the cavity in a region other than a product region of the cavity and configured to apply a second pressure to the molten metal, the first pressurizing device comprising:
a first pressurizing plunger configured to apply the second pressure to the molten metal,
a first pressurizing actuator configured to move the first pressurizing plunger, and
a second liquid pressure circuit configured to drive the first pressurizing actuator; and
a control device configured to control the first pressurizing device so that the second pressure becomes higher than the first pressure;
wherein the first pressurizing actuator is provided in the fixed die plate and the first pressurizing plunger is provided in the fixed die.
 
10. A die casting machine comprising:
a base;
a fixed die plate fixed onto the base and holding a fixed die;
a movable die plate provided on the base, the movable die plate configured to move in a mold opening and closing direction, and the movable die plate holding a movable die to face the fixed die;
an injection device configured to fill a molten metal into a cavity formed by the fixed die and the movable die, and the injection device configured to apply a first pressure to the molten metal;
a first pressurizing device configured to pressurize the molten metal filled in the cavity in a region other than a product region of the cavity and configured to apply a second pressure to the molten metal;
a second pressurizing device configured to pressurize the molten metal filled into the cavity in a region other than the product region of the cavity and configured to apply a third pressure to the molten metal; and
a control device configured to control the first pressurizing device so that the second pressure becomes higher than the first pressure and configured to control the second pressurizing device so that the third pressure becomes higher than the first pressure.