Claims
- 1. A process for clamping a mold clamping device including a molding machine having a fixed mold with a fixed board and a movable mold with a movable board, a clamping cylinder slidably fitted with a clamping ram , a front end at said clamping ram is fixed on said movable board of said molding machine, an inner space of said clamping cylinder being divided into a rear chamber and a front chamber by a large-diameter piston section of said clamping ram, a mold opening piston having one end fixed to an inner rear wall of said clamping cylinder and the other end slidably positioned within an inner space of said clamping ram, said mold opening piston divides said inner space of said clamping ram into a first chamber and a second chamber, said second chamber constantly being open to the atmosphere at said front end of said clamping ram where said clamping ram is fixed to said movable board of said molding machine, said process comprising the steps of:
- a step of high speed mold closure during which said rear chamber, said front chamber and said first chamber are pressurized by connecting to an oil pressure source , said front chamber and said first chamber are connected to said rear chamber, and the oil in said front chamber and said first chamber is introduced into said rear chamber;
- a step of tight clamping during which said rear chamber is pressurized by connecting to said oil pressure source after mold closure, and said front chamber and said first chamber are connected to an oil tank to release pressure; and
- a step of high speed mold opening during which said first chamber is pressurized by connecting to said oil pressure source said rear chamber and said front chamber are connected to each other and said rear chamber is connected to said oil tank to introduce the oil in said rear chamber into said front chamber, and the rest of the oil is introduced into said oil tank.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-45983 |
Feb 1987 |
JPX |
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Parent Case Info
This application is a divisional, of application Ser. No. 161,120 filed on Feb. 26, 1988, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1483972 |
Jun 1967 |
FRX |
8300541 |
Feb 1983 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Stewart et al., ABC's of Hydraulic Circuits, Howard W. Sams & Co., Inc., Indianapolis, IN, (1973), pp. 109-117. |
Divisions (1)
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Number |
Date |
Country |
Parent |
161120 |
Feb 1988 |
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