Die casting method and die casting device

Patent metadata

Field	Value
Publication number	US-11413681-B2
Application number	US-202017137977-A
Country	US
Kind code	B2
Filing date	Dec 30, 2020
Priority date	Feb 27, 2020
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

A die casting method includes a step of supplying molten metal to a plunger sleeve, and a step of advancing a plunger in the plunger sleeve, to inject the molten metal into dies. In the step of injecting the molten metal into the dies, the plunger is once retracted before being advanced, and the plunger is kept accelerated until the plunger reaches a target maximum speed when the plunger retracted is advanced.

First claim

What is claimed is:

1. A die casting method comprising:
supplying molten metal to a plunger sleeve;
after supplying the molten metal to the plunger sleeve, retracting a plunger once; and
after the plunger is once retracted, advancing the plunger in the plunger sleeve, to inject the molten metal into dies,
wherein, the plunger is kept accelerated until the plunger reaches a target maximum speed when the retracted plunger is advanced.

2. The die casting method according to claim 1 , wherein, after the molten metal is supplied from a supply port provided in the plunger sleeve, the supply port is closed before the plunger is advanced.

3. The die casting method according to claim 1 , wherein, when the plunger is advanced, the plunger is kept accelerated until the plunger reaches the target maximum speed, at a maximum acceleration which a die casting device is able to exhibit.

4. The die casting method according to claim 1 , wherein, when the plunger is once retracted, the plunger is hydraulically driven with a servo pump.

5. A die casting device comprising:
a plunger sleeve configured to be supplied with molten metal via a supply port;
dies that communicate with the plunger sleeve;
a plunger configured to inject the molten metal supplied to the plunger sleeve, into the dies; and
a controller programmed to:
after the molten metal is supplied to the plunger sleeve, retract the plunger once; and
after the plunger is once retracted, advance the plunger to inject the molten metal into the dies, and keep the plunger accelerated until the plunger reaches a target maximum speed when the retracted plunger is advanced.

6. The die casting device according to claim 5 , further comprising a lid portion configured to open and close the supply port.

7. The die casting device according to claim 5 , wherein, when the plunger is advanced, the controller is programmed to keep the plunger accelerated until the plunger reaches the target maximum speed, at a maximum acceleration which the die casting device is able to exhibit.

8. The die casting device according to claim 5 , further comprising a servo pump configured to hydraulically drive the plunger, when the plunger is once retracted.

Assignees

• Toyota Motor Co Ltd

Inventors

• Matsuura Yoshiki
• Asano Junji

Classifications

• B22D17/32 Primary

  Controlling equipment · CPC title

• B22D17/10 Primary

  with horizontal press motion · CPC title

• B22D17/20 Primary

  Accessories: Details · CPC title

• B22D17/30

  Accessories for supplying molten metal, e.g. in rations (supplying molten metal in ration in general B22D39/00) · CPC title

• B22D17/04 Primary

  Plunger machines · CPC title