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-10982690-B2
Application number	US-201815921981-A
Country	US
Kind code	B2
Filing date	Mar 15, 2018
Priority date	Mar 15, 2017
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

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;
a pneumatic chamber formed on an input side of the cylinder;
a hydraulic chamber that moves to an output side of the cylinder due to pressure of the pneumatic chamber, wherein the hydraulic chamber includes a first hydraulic chamber and a second hydraulic chamber; and
an output rod that outputs amplified hydraulic pressure that is generated in the first hydraulic chamber by pressurizing the first hydraulic chamber,
wherein the cylinder device is configured to:
generate a first force in a radial direction by pressurizing the second hydraulic chamber; and
fix the first hydraulic chamber and the second hydraulic chamber using the first force.

2. The cylinder device according to claim 1 , wherein the hydraulic chamber is configured to:
generate hydraulic pressure using the first force at the output side and using a second force that is applied to the hydraulic chamber by the output rod.

3. The cylinder device according to claim 1 ,
wherein the cylinder device 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 using the first force in the radial direction.

4. The cylinder device according to claim 1 , wherein the cylinder device is configured to:
generate a third force in the radial direction by pressing, to a clamper, a taper member moving in the thrust direction using hydraulic pressure of 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 using the third force.

5. The cylinder device according to claim 1 ,
wherein the first hydraulic chamber has an output piston pressing the output rod toward the output side,
the cylinder device further comprising:
biasing means that biases the output piston in a direction opposite to the output side.

6. The cylinder device according to claim 5 ,
wherein the output piston of the first hydraulic chamber transmits only an output to the output rod without moving even in a state in which the amplified hydraulic pressure is applied to the output rod and thrust is output.

7. The cylinder device according to claim 6 ,
wherein a rod portion of the first piston is divided into two rod portions provided with a predetermined clearance therebetween.

8. The cylinder device according to claim 1 ,
wherein the pneumatic chamber includes a first pneumatic chamber having a first piston that pressurizes the first hydraulic chamber and a second pneumatic chamber having a second piston that pressurizes the second hydraulic chamber,
wherein the second pneumatic chamber is disposed on the input side, and
wherein the first pneumatic chamber is disposed on the output side,
the cylinder device further comprising:
a first inlet/outlet for pressurizing the second pneumatic chamber; and
a third inlet/outlet for pressurizing the first pneumatic chamber by penetrating through the second pneumatic chamber and the second hydraulic chamber.

9. The cylinder device according to claim 8 further comprising:
an input-side housing provided with the second hydraulic chamber; and
an output-side housing provided with the first pneumatic chamber and the first hydraulic chamber,
wherein the input-side housing is fixed to a first side of the output-side housing.

10. The cylinder device according to claim 9 ,
wherein the second piston is disposed between the input-side housing and the second pneumatic chamber, makes movement to the output side due to pressure from the second pneumatic chamber, and has a rod portion that pressurizes the second hydraulic chamber due to the movement.

11. The cylinder device according to claim 10 ,
wherein the third inlet/outlet penetrates through the second piston and the rod portion and penetrates through the second pneumatic chamber and the second hydraulic chamber.

12. The cylinder device according to claim 1 ,
wherein the pneumatic chamber includes a first pneumatic chamber having a first piston that pressurizes the first hydraulic chamber and a second pneumatic chamber having a second piston that pressurizes the second hydraulic chamber,
wherein the second pneumatic chamber is disposed on the input side, and
wherein the first pneumatic chamber is disposed on the output side,
the cylinder device further comprising:
a first inlet/outlet for pressurizing the second pneumatic chamber; and
a communication hole which penetrates through the second hydraulic chamber and through which the first pneumatic chamber communicates with the second pneumatic chamber.

13. The cylinder device according to claim 12 further comprising:
an input-side housing provided with the second hydraulic chamber; and
an output-side housing provided with the first pneumatic chamber and the first hydraulic chamber,
wherein the input-side housing is fixed to a first side of the output-side housing,
wherein the second piston is disposed between the input-side housing and the second pneumatic chamber, makes movement to the other end side due to pressure from the second pneumatic chamber, and has a rod portion that pressurizes the second hydraulic chamber due to the movement,
wherein the communication hole is provided with a communication rod that penetrates through the second piston and the rod portion and is fixed to the second piston, and a valve mechanism disposed on a communication channel between the first pneumatic chamber and the second pneumatic chamber, and
wherein the valve mechanism performs opening and closing in association with the movement of the communication rod moving along with the second piston.

14. The cylinder device according to claim 1 ,
wherein the pneumatic chamber includes a first pneumatic chamber having a first piston that pressurizes the first hydraulic chamber, a second pneumatic chamber having a second piston that pressurizes 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 a first inlet/outlet and is formed on the input side.

15. The cylinder device according to claim 14 , further comprising:
a pneumatic rod that is formed from the first piston to the input side by penetrating through the first pneumatic chamber.

16. The cylinder device according to claim 14 ,
wherein the first piston causes the second pneumatic chamber, the first hydraulic chamber, and the second hydraulic chamber to move to the output side until the output rod abuts on a workpiece or until the first hydraulic chamber reaches an end portion on the output side to which the first hydraulic chamber is movable, with pressure of the first pneumatic chamber.

17. The cylinder device according to claim 16 ,
wherein a movement distance of the second piston is set within a range of a length of elastic deformation of a seal member of the second hydraulic chamber, wherein the movement distance of the second piston is measured when the second piston generates the hydraulic pressure of the second hydraulic chamber.

18. The cylinder device according to claim 16 ,
wherein the first hydraulic chamber is formed on the output, and
wherein the first piston is formed on the first hydraulic chamber by penetrating through the second pneumatic chamber and the second hydraulic chamber.

19. The cylinder device according to claim 16 , further com

Assignees

• Seiko Instr Inc

Inventors

• Arai Shigehiro

Classifications

• B21D22/22

  with devices for holding the edge of the blanks (B21D22/24 - B21D22/30 take precedence; shaping over a die without external former B21D11/02) · CPC title

• B30B15/165

  for pneumatically-hydraulically driven presses · CPC title

• B21D28/002

  Drive of the tools (B21D28/007 and B21D28/20 take precedence) · CPC title

• B30B1/32 Primary

  by plungers under fluid pressure · CPC title

• B30B1/38

  wherein the plungers are operated by pressure of a gas, e.g. steam, air · CPC title