Cylinder device, press machine, workpiece clamping apparatus, cylinder device actuating method, method for clamping workpiece, and method for pressing workpiece

Patent metadata

Field	Value
Publication number	US-10821564-B2
Application number	US-201815919732-A
Country	US
Kind code	B2
Filing date	Mar 13, 2018
Priority date	Mar 15, 2017
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A pneumatic chamber 20 is configured to include a first pneumatic chamber 21 pressurizing a first piston 11 and a second pneumatic chamber 22 pressurizing a second piston 12. The first pneumatic chamber 21 communicates with the second pneumatic chamber 22. The hydraulic pressure generating unit 55 is internally provided with a hydraulic chamber 30, and the hydraulic chamber 30 is configured to have a first hydraulic chamber 31 pressurized by the first pneumatic chamber 21 via the first piston 11 and a second hydraulic chamber 32 pressurized by the second pneumatic chamber 22 via the second piston 12. The hydraulic pressure generating unit 55 is movable in a thrust direction in a cylinder 2, and the second hydraulic chamber 32 has a function of fixing the moving hydraulic pressure generating unit 55 in the cylinder 2 by causing a thin portion 15 to be elastically deformed in a radial direction due to hydraulic pressure. The first hydraulic chamber 31 outputs hydraulic pressure of the first hydraulic chamber 31, which is increased by the fixing, to an output rod 7.

First claim

What is claimed is:

1. A cylinder device comprising:
a cylinder having a first end and second end; wherein a first inlet/outlet is located at the first end of the cylinder and a second inlet/outlet is located at the second end of the cylinder;
a pneumatic chamber formed in the first end of the cylinder;
a hydraulic chamber configured to move to the second end in the cylinder by means of pressure of the pneumatic chamber;
a fixer configured to generate a force in a radial direction from a force in a thrust direction, which is applied to the hydraulic chamber by the pneumatic chamber, and fixing the hydraulic chamber in the cylinder due to the force in the radial direction;
a hydraulic pressure amplifier that is provided on the second end in the cylinder and configured to amplify hydraulic pressure that is generated in the fixed hydraulic chamber by the pneumatic chamber; and
an output rod that extends to an outside of the cylinder on the first end of the cylinder and configured to output the amplified hydraulic chamber to the first end of the cylinder by penetrating through the hydraulic pressure amplifier and the pneumatic chamber.

2. The cylinder device according to claim 1 ,
wherein the hydraulic chamber is configured to generate hydraulic pressure by receiving a force in a direction to the second end of the cylinder, which is applied to the hydraulic chamber by the pneumatic chamber, and a force in a direction to the one of the end sides, which is applied to the hydraulic chamber by the output rod.

3. The cylinder device according to claim 1 ,
wherein the hydraulic chamber includes a first hydraulic chamber provided with the output rod and a second hydraulic chamber provided with the fixer,
wherein the fixer is configured to fix the second hydraulic chamber and the first hydraulic chamber by generating the force in the radial direction by means of hydraulic pressure of the second hydraulic chamber, and
wherein the hydraulic pressure amplifier is configured to amplify hydraulic pressure generated in the first hydraulic chamber and output the hydraulic pressure to the output rod.

4. The cylinder device according to claim 3 ,
wherein the fixer is configured to fix the second hydraulic chamber and the first hydraulic chamber by pressing, to an inner wall of the cylinder, a side wall of the second hydraulic chamber that is elastically deformed by the force in the radial direction.

5. The cylinder device according to claim 3 ,
wherein the fixer is configured to generate the force in the radial direction by pressing, to a clamper, a taper member moving in a thrust direction by means of hydraulic pressure generated in the second hydraulic chamber, and fix the second hydraulic chamber and the first hydraulic chamber by pressing the clamper to an inner wall of the cylinder by the force.

6. The cylinder device according to claim 3 ,
wherein the first hydraulic chamber includes an output piston configured to press the output rod in an output direction.

7. The cylinder device according to claim 6 ,
wherein the output piston of the first hydraulic chamber configured to transmit only an output to the output rod without moving even in a state in which hydraulic pressure generated by being amplified in the first hydraulic chamber is applied to the output rod and thrust is output.

8. The cylinder device according to claim 3 ,
wherein the pneumatic chamber includes a first pneumatic chamber having a first piston configured to pressurize the first hydraulic chamber, a second pneumatic chamber having a second piston configured to pressurize the second hydraulic chamber, and a communication hole through which the first pneumatic chamber communicates with the second pneumatic chamber, and
wherein the first pneumatic chamber has the first inlet/outlet and is formed on a first end of the second pneumatic chamber.

9. The cylinder device according to claim 8 ,
wherein the first piston causes the second pneumatic chamber, the first hydraulic chamber, and the second hydraulic chamber to move to the second end of the cylinder until the output rod abuts on a pressing target or until the first hydraulic chamber reaches an end portion on the second end of the cylinder to which the first hydraulic chamber is movable, with pressure of the first pneumatic chamber.

10. The cylinder device according to claim 9 ,
wherein a movement distance of the second piston measured when the second piston of the second hydraulic chamber generates hydraulic pressure amplified in the second hydraulic chamber is within a range of a length of an elastic deformation of a seal member of the second hydraulic chamber, which is disposed in the second piston.

11. The cylinder device according to claim 9 ,
wherein the first hydraulic chamber is formed on a second end of the second hydraulic chamber, and
wherein the first piston is formed up to the first hydraulic chamber by penetrating through the second pneumatic chamber and the second hydraulic chamber.

12. The cylinder device according to claim 9 , further comprising:
a third pneumatic chamber that is provided on the second end of the cylinder and configured to press the hydraulic chamber to the first end of the cylinder.

13. The cylinder device according to claim 1 , further comprising:
a rotation angle changer configured to change a rotation angle of the output rod around a central axis during movement of the output rod.

14. The cylinder device according to claim 13 ,
wherein the rotation angle changer is configured to change the rotation angle of the output rod by using a sliding mechanism having a protruding member and a groove that engages with the protruding member and formed in a moving direction of the output rod, the protruding member being formed on a first member of the output rod and a sliding surface opposite to the output rod, and the groove being formed on a second member of the output rod.

15. A press machine comprising:
the cylinder device according to claim 9 ;
a workpiece mounting member configured to mount a workpiece at a predetermined position with respect to the cylinder device;
a presser configured to press the mounted workpiece with a tool disposed on the output rod by driving the cylinder device; and
a detaching member configured to detach the pressed workpiece from the predetermined position.

16. A workpiece clamping apparatus comprising:
the cylinder device according to claim 12 ;
a workpiece mounting member configured to mount a workpiece at a predetermined position with respect to the cylinder device;
a pressing and clamping member configured to press and clamp the mounted workpiece with a tool disposed on the output rod by driving the cylinder device; and
a detaching member configured to detach the clamped workpiece from the predetermined position.

17. A cylinder device actuating method for actuating the cylinder device according to claim 12 , the method comprising:
setting an initial state by causing the first hydraulic chamber and the second hydraulic chamber to move to the one end side by pressurizing the third pneumatic chamber from the second inlet/outlet and depressurizing the first pneumatic chamber and the second pneumatic chamber from the first inlet/outlet;
causing the output rod to abut on a pressing target or causing the first hydraulic chamber to reach the end portion on the second end of the cylinder to which the first hydraulic chamber is movable by causing the first pneumatic chamber and the second pneumatic chamber to move to the second end of the cylinder by pressurizing the first pn

Assignees

• Seiko Instr Inc

Inventors

• Arai Shigehiro

Classifications

• F15B11/022

  in which a rapid approach stroke is followed by a slower, high-force working stroke (F15B11/0325 takes precedence) · CPC title

• B30B1/00

  Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen · CPC title

• F15B15/1409

  with two or more independently movable working pistons · CPC title

• F15B2211/775

  Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press · CPC title

• F15B11/0725

  with the driving energy being derived from a pneumatic system, a subsequent hydraulic system displacing or controlling the output element · CPC title