Press system
AssigneeAida Engineering, Ltd.
InventorYasuyuki Kohno
Life of this patent
Estimating the term…
Abstract
A press system providing excellent energy efficiency for a whole press system and capable of achieving low prices is provided. A die cushion apparatus constituting a press system supports a cushion pad, includes a hydraulic cylinder which generates a die cushion load on the cushion pad when a slide of a press machine descends, the press machine includes a hydraulic cylinder which generates part of a press load on the slide when the slide descends. The pressure generation chamber of the hydraulic cylinder for generating a die cushion load and the pressure generation chamber of the hydraulic cylinder for generating part of the press load can communicate with each other via pipes and a first logic valve for a period during which the die cushion load acts.
Claims13
A press system comprising:
- a die cushion apparatus;
- and
- a press machine, wherein
- the die cushion apparatus comprises a first hydraulic cylinder configured to support a cushion pad and apply a die cushion load to the cushion pad when a slide of the press machine descends,
- the press machine comprises a second hydraulic cylinder configured to apply a part of a press load to the slide when the slide descends, and
- the press system comprises:
- a piping configured to connect between a first pressure generation chamber which is provided to the first hydraulic cylinder and configured to generate the die cushion load, and a second pressure generation chamber which is provided to the second hydraulic cylinder and configured to generate the part of the press load;
- a pilot-drive-type first logic valve configured to allow the piping to establish communication between the first pressure generation chamber and the second pressure generation chamber for a period during which the die cushion load acts on the first hydraulic cylinder;
- a first solenoid valve configured to switch a pressure acting on a pilot port of the first logic valve between a pressure of the first pressure generation chamber of the first hydraulic cylinder and a system pressure which is a pressure of a low-pressure source;
- and
- a valve controller configured to switch the first solenoid valve at least for the period during which the die cushion load acts on the first hydraulic cylinder, and cause the pressure of the low-pressure source to act on the pilot port of the first logic valve to open the first logic valve,
- the press system further comprises:
- a pilot-drive-type second logic valve configured to block or establish communication between the second pressure generation chamber of the second hydraulic cylinder and the low-pressure source;
- and
- a second solenoid valve configured to switch a pressure acting on a pilot port of the second logic valve between a pressure of the second pressure generation chamber of the second hydraulic cylinder and the system pressure which is the pressure of the low-pressure source, and
- for a period before the die cushion load acts on at least the first hydraulic cylinder and the slide descends, the valve controller switches the second solenoid valve and causes the pressure of the second pressure generation chamber to act on the pilot port of the second logic valve to open the second logic valve, and switches the first solenoid valve and causes the pressure of the first pressure generation chamber to act on the pilot port of the first logic valve to close the first logic valve.
Dependencies are inferred from the claim text.