Title:
BOOSTER FOR HYDRAULIC CYLINDER
Document Type and Number:
Japanese Patent JP3474840
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent a core from being pushed back by pressurized hydraulic fluid from a high load accompanying casting pressure of molten metal during casting and pressurizing in a core driving cylinder of a die casting machine.
SOLUTION: A boosting cylinder 2a communicating to a head side cylinder chamber 22 of an operation cylinder 1 at a boosting chamber 31 side and a control hydraulic circuit are provided. When a load and a rated pressure Pp of a hydraulic pump 25 are balanced during insertion and setting of a core 41, a check valve 21 is closed, then, a sequence valve 34 is opened to make the boosting cylinder 2a depart and to increase pressure of the head side chamber 22. A boost ratio of the boosting cylinder 2a is set to a pressure higher than a pressure in the head side cylinder 22 generated by casting pressure, and a discharge amount of the boosting cylinder 2a is set to a value equivalent to hydraulic fluid compression amount of the head side cylinder chamber 22. The compression amount is automatically corrected by departure of the boosting cylinder 2a.
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Inventors:
Kazufumi Nomura
Hiroshi Kitamura
Satoshi Komatsu
Hiroshi Kitamura
Satoshi Komatsu
Application Number:
JP2000275041A
Publication Date:
December 08, 2003
Filing Date:
September 11, 2000
Export Citation:
Assignee:
Nambu Co., Ltd.
International Classes:
F15B3/00; B22C9/10; B22D17/20; B22D17/24; B22D17/32; F15B11/028; F15B11/032; (IPC1-7): F15B3/00; B22C9/10; B22D17/32; F15B11/028
Domestic Patent References:
JP5935871A | ||||
JP5819383B2 |
Other References:
【文献】特許2662256(JP,B2)
Attorney, Agent or Firm:
Toshikazu Nagai
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