Unlock instant, AI-driven research and patent intelligence for your innovation.

Drive for a punch or forming machine

A hydraulic transmission device and pressure chamber technology, which is applied to fluid pressure actuators, presses, variable displacement engines, etc., can solve problems such as complex structures, and achieve simple valve settings, low cost valve settings, and reduced time consumption Effect

Inactive Publication Date: 2008-10-08
BOSCH REXROTH AG
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The disadvantage of this solution is that the arrangement of the valves with two contacting control slide valves and the electric control is technically complex

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Drive for a punch or forming machine
  • Drive for a punch or forming machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] FIG. 2 shows a simplified circuit diagram of the nibber drive 1 for high-speed operation. The removal movement on this nibbler is completed within 10ms-20ms.

[0022] The nibbler has a working cylinder 2 which, as in the known solution mentioned at the outset, has a piston 4 which separates a cylinder chamber 6 from an annular chamber 8 and acts indirectly or directly on the stamping tool. Piston 4 has a rear piston rod 18 which extends outwards from the piston bottom and passes through cylinder 2 at the end.

[0023] The cylinder chamber 6 is connected to the working connection A of a continuously adjustable valve 10 which, in its adjustment position (b), controls the connection between the cylinder chamber 6 and a tank line 20 connected to the tank. A tank line damper 22 and a bias valve 24 are disposed within the tank line 20 . The pressure fluctuation in the fuel tank pipeline 20 is suppressed by the fuel tank pipeline shock absorber 22 , and the fuel tank pipelin...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

What is disclosed is a hydraulic drive mechanism for a blanking or forming machine comprising a working cylinder having several pressure chambers, the piston of which acts directly or indirectly on a workpiece to be processed, wherein at least one pressure chamber of the working cylinder for retracting and extending the piston is adapted to be subjected to a tank pressure or a supply pressure via a continuously adjustable valve, and comprising a valve assembly arranged upstream of the continuously adjustable valve, whereby an inlet port of the continuously adjustable valve may be subjected to a higher or lower supply pressure, wherein the valve assembly comprises a switching valve adapted to be switched over between a basic position and a switching position in dependence on the load pressure at the working cylinder in order to tap the supply pressure from a low-pressure source or from a high-pressure source.

Description

technical field [0001] The invention relates to a hydraulic transmission for a press or metal forming machine. Background technique [0002] Such hydraulic transmissions for stamping or metal forming machines, in particular nibbling machines operating at high speeds, have a working cylinder designed as a differential cylinder, by means of which the stamping tool is actuated. FIG. 1 shows a circuit diagram of a known, but not published, solution of such a hydraulic transmission. [0003] The working cylinder 2 is divided by the piston 4 into a piston bottom-side cylinder chamber 6 and a piston rod-side annular chamber 8 . The cylinder chamber 6 is supplied with pressurized oil via a continuously adjustable valve 10 . The input connection E of the continuously adjustable valve 10 is connected to the valve arrangement 12 . The valve arrangement 12 has a non-return valve 14 which can be blocked and a non-return valve 16 which is connected in parallel thereto. The unblockable...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B30B15/16
CPCB30B15/163F15B2211/20592B30B15/16F15B11/024F03C1/007F15B2211/3133F15B11/022F15B2211/6653
Inventor 斯特凡·施密特罗尔夫·海登费尔德
Owner BOSCH REXROTH AG