JPH0140694B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention includes a plurality of drilling cylinder devices in which a punch for drilling a workpiece is attached to a drilling piston that reciprocates in a cylinder chamber. This invention relates to an improvement in a punching device that punches a plurality of holes in a workpiece at once.

(Prior Art) Conventionally, each cylinder chamber is provided with a reciprocating drilling piston, each drilling piston is formed with a drilling piston rod, and a tip of each drilling piston rod is formed. A punch for drilling a workpiece is attached to the cylinder chamber, and each cylinder chamber has an oil inflow/outflow hole through which oil flows in and out for driving each of the drilling pistons in the drilling direction of the punch;
a plurality of cylinder devices provided with a drilling piston return means for driving each of the drilling pistons in a direction opposite to the drilling direction; and a first cylinder device into which air for reciprocating the pressure increasing piston is introduced. a cylinder chamber; and a second cylinder chamber that is formed protruding from the pressure increase piston and into which a pressure increase piston rod having a smaller diameter than the pressure increase piston rod is fitted;
The cylinder chamber is divided into two chambers, a reciprocating pneumatic chamber on the protruding side of the pressurizing piston rod and a forward pneumatic chamber on the non-protruding side of the pressurizing piston rod, with the pressure increasing piston as a boundary; The moving pneumatic chamber is provided with a pressure increasing piston return means for driving the pressure increasing piston to a return position, and the forward moving pneumatic chamber is supplied with air pressure for moving the pressure increasing piston forward. An air pressure supply hole is provided in the second cylinder chamber to communicate with the oil inflow and outflow hole, and the oil in the second cylinder chamber is supplied to the cylinder chamber as the pressure-increasing piston rod moves forward. is provided with an oil inflow/outflow hole through which oil flows in and out through a downstream cylinder hydraulic passage, and an oil pressure communicating with the second cylinder chamber is provided at a position near the tip of the pressure increasing piston rod when the pressure increasing piston is in the return position. A pressure increasing cylinder device in which a communication hole is formed, and a pneumatic-hydraulic conversion cylinder having a sufficient amount of oil to operate the plurality of drilling pistons are provided, and the pneumatic-hydraulic conversion cylinder has an upstream cylinder. and a pneumatic-hydraulic conversion means provided with a hydraulic hole that communicates with the hydraulic communication hole through a hydraulic passage, and a pneumatic communication hole for introducing pneumatic pressure. During this period, the oil stored in the pneumatic-hydraulic conversion cylinder is supplied to each cylinder chamber, and after the punch comes into contact with the workpiece, the pressure increasing cylinder device is driven and the oil is supplied from the pneumatic-hydraulic conversion cylinder to each cylinder chamber. A drilling device is known in which the supply of oil to the first cylinder is stopped, and the oil in the second cylinder of the pressure-increasing cylinder device is supplied to each cylinder chamber to simultaneously drill a plurality of holes in a workpiece.

(Problems to be Solved by the Invention) By the way, in this conventional drilling device, oil is supplied from the pneumatic-hydraulic conversion cylinder to each cylinder chamber, and oil is supplied from the second cylinder of the pressure boosting cylinder device to each cylinder chamber. In order to switch over from the old oil supply, a limit switch and a control circuit are installed, and the limit switch detects when the punch comes into contact with the workpiece. Because of the difference in reciprocating motion, the punch attached to one drilling piston is the only one that is in contact with the workpiece, but the other drilling pistons are attached to it. The punch may not be in contact with the workpiece, making it difficult to time the switching. Therefore, in conventional punching machines, a limit switch is provided for each cylinder, and all of the limit switches are set so that the punch does not contact the workpiece. Based on the detection of contact, a control circuit is activated to drive the pressure increasing piston, but this poses a problem in that the configuration becomes extremely complicated.

Instead of providing this limit switch, it is conceivable to provide a timer means to drive the pressure increasing cylinder device after a certain period of time has elapsed after driving the drilling piston, but if configured in this way,
Since the configuration does not directly detect that the punches have contacted the workpiece, an extra time must be allowed for until all the punches come into contact with the workpiece, which reduces the efficiency of the drilling operation.

(Objective of the Invention) The present invention has been made in view of the problems of the above-mentioned prior art, and aims to provide a simple configuration and direct connection from the pneumatic-hydraulic conversion cylinder to each cylinder chamber. It is an object of the present invention to provide a perforation device that can efficiently control the switching timing between the previous oil supply and the previous oil supply from the second cylinder of the pressure increasing cylinder device to each cylinder chamber.

(Means for Solving the Problems) In the present invention, when the punch comes into contact with the workpiece, the workpiece acts as resistance and the forward movement of each drilling cylinder device is stopped, and accordingly, the pneumatic-hydraulic conversion cylinder This was done by focusing on the fact that the oil supply to each cylinder chamber is stopped and the air pressure in the pneumatic/hydraulic conversion cylinder returns to the original air pressure of the air supply source and increases. Its feature is that it has a branch passage communicating with the pneumatic supply hole, and is switched as the pneumatic pressure of the pneumatic/hydraulic conversion cylinder increases based on the punch contacting the workpiece. A switching valve for driving a pressure increasing piston to supply air pressure from an air supply source to the forward movement chamber of the cylinder chamber, and an air supply source that connects the air pressure communication hole to the air chamber of the pneumatic-hydraulic conversion cylinder when the switch is turned on. The drilling piston is driven in the direction toward the workpiece until the punch contacts the workpiece by supplying air pressure from the air pressure converter cylinder and supplying the oil in the pneumatic-hydraulic conversion cylinder to the cylinder chamber via the hydraulic passage for the downstream cylinder. It has a new air supply switching valve that releases the air in the air chamber side of the pneumatic-hydraulic conversion cylinder and the air in the branch passage to the atmosphere when the switch is turned off. The oil stored in the cylinder is supplied to each cylinder chamber, and the contact of the punch with the workpiece is detected based on the increase in air pressure in the air chamber of the pneumatic-hydraulic conversion cylinder, and the oil is transferred from the pneumatic-hydraulic conversion cylinder to the second cylinder chamber. The point is that the supply of oil into the cylinder is stopped and the oil in the second cylinder is supplied to each cylinder chamber.

(Example) An example of a drilling device according to the present invention will be described below based on the drawings.

1 to 3, 1 is a die, 2 is a workpiece, and here, a plurality of drilling cylinder devices 3 are provided above the workpiece 2. In FIGS.
This drilling cylinder device 3 has a cylinder pipe 4, and the cylinder pipe 4 is provided with a drilling piston 5, so that the drilling piston 5 is reciprocated within its cylinder chamber A. It's getting old. The drilling piston 5 is roughly composed of a piston body 6 and a piston rod 7, and a punch 8 for drilling a workpiece is attached to the tip of the piston rod 7.
9 is a clamping flange that clamps the workpiece 2 together with the die 1 at the workpiece drilling position; FIG. 1 shows the state in which each drilling piston is in the return position, and FIG. The piston 5 is shown in the drilling completion position. Each cylinder chamber A is defined by a piston body 6, and each cylinder chamber A is configured to include a hydraulic chamber 10 and a pneumatic chamber 11, and the hydraulic chamber 10 has an oil inflow and outflow hole 1.
The pneumatic pressure chamber 11 is connected to an air supply source 15 via an air passage 14 via a cylinder hydraulic passage 12 leading to the cylinder 2'. will be communicated to.
This air passage 14 functions as a drilling piston return means for returning the drilling piston 5, and also functions as a pressure increasing piston returning means for returning a pressure increasing piston 17 of a pressure increasing cylinder device 16, which will be described later. It is something.

An air supply switching valve 18 is located in the middle of the air passage 14.
The air passage 14 has an upstream air passage 19 on the upstream side of the air supply switching valve 18, a downstream air passage 20 on the downstream side thereof, and an air passage 14 on the downstream side of the upstream air passage 19. port 21
In FIG. 1, air from the air supply source 15 is supplied to each pneumatic chamber 11 via the air passage 14, with the air supply switching valve 18 communicating with the ports 21 and 22. The state in which the direction is being supplied is shown. Here, the air supply switching valve 18 is reciprocated in the direction of arrow B-B' by a manual switch 23, and when the manual switch 23 is rotated in the direction of arrow C, it is turned on in the direction of arrow B'. , when it is rotated in the direction opposite to the direction of arrow C, it is turned off in the direction of arrow B.

The pneumatic-hydraulic conversion cylinder 13 has a pneumatic-hydraulic conversion chamber 24 consisting of an air chamber and an oil chamber.
The air chamber of this pneumatic-hydraulic conversion chamber 24 is connected to the pneumatic communication hole 2.
5', an air passage 25, an air supply switching valve 18, and an upstream air passage 19 to communicate with the air supply source 15, and 26 indicates a port of the air passage 25, as shown in FIG. In addition, when the air supply switching valve 18 is in the position shown in the figure, the air in the pneumatic/hydraulic conversion chamber 24 is released to the atmosphere via the air passage 25 and the air supply switching valve 18. The pneumatic-hydraulic conversion chamber 24 includes an air supply switching valve 1.
8 is driven in the direction of arrow B' as shown in FIG. 2, the ports 21 and 26 are brought into communication and air is supplied from the air supply source 15.
The pneumatic-hydraulic conversion chamber 24 converts pneumatic pressure into hydraulic pressure based on the air supply, and transfers the oil 27 to each hydraulic chamber 10.
It will be supplied to the following countries. The drilling piston 5 receives oil 27 from its pneumatic-hydraulic conversion chamber 24.
The arrow C in FIG. 2 indicates the forward movement direction of the drilling piston 5, and at that time, the port 22 of the downstream air passage 20 is communicated with the atmosphere. Therefore, the air in the pneumatic chamber 11 is released into the atmosphere as the drilling piston 5 moves forward. The air pressure in the pneumatic-hydraulic conversion chamber 24 increases as the oil 27 stored in the pneumatic-hydraulic conversion chamber 24 is supplied toward each hydraulic chamber 10, so that the volume on the air side increases. During the supply, the pressure becomes slightly lower than that of the air supply source 15, and when the punch 8 contacts the workpiece 2, the forward movement of each drilling cylinder 5 is stopped at the contact position. Then, the oil 27 is transferred from the pneumatic-hydraulic conversion chamber 24 to each hydraulic chamber 10.
The supply of air is stopped, and the pressure of the air in the pneumatic-hydraulic conversion chamber 24 returns to and rises to the air pressure possessed by the air supply source 15.

The pressure increasing cylinder device 16 includes an oil chamber 28 as a second cylinder device and a pneumatic chamber 29 as a first cylinder device, and the pressure increasing piston 1
7 is roughly composed of a pressure-increasing piston rod 30 and a piston body 31, and the pneumatic chamber 29 is divided into two chambers, a backward-acting pneumatic chamber 32 and a forward-acting pneumatic chamber 33, by the piston body 31. has been completed. The pressure increasing piston rod 30 is formed to protrude from the piston body 31 and is configured to be fit into the oil chamber 28, and the diameter of the pressure increasing piston rod 30 is smaller than the diameter of the piston body 31. The oil chamber 28 is the hydraulic passage 1 for the cylinder.
A hydraulic passage 12 for the cylinder is provided in the middle of the cylinder 2.
The upstream side of the oil chamber 28 is defined as an upstream cylinder hydraulic passage 34, and the downstream side thereof is a downstream cylinder hydraulic passage 35, and the downstream end of the upstream cylinder hydraulic passage 34 is connected to the hydraulic pressure of the oil chamber 28. It is configured to communicate with the communication hole 36. Hydraulic communication hole 3
Reference numeral 6 is provided near the tip of the pressure increasing piston rod 30 when the pressure increasing piston 17 is in the return position, and as shown in FIG.
When is in the return position, the hydraulic communication hole 36 is opened and the oil chamber 28 and the pneumatic-hydraulic conversion chamber 24 are in communication. The backward movement pneumatic chamber 32 is communicated with the downstream air passage 14, and the forward movement pneumatic chamber 33 is communicated with the branch passage 37 via the air supply hole 33'.
38 indicates a port of the branch passage 37.
This reciprocating air pressure chamber 33 is communicated with the air supply passage 25 via a pressure increasing piston driving switching valve 39. Here, the pressure increasing piston driving switching valve 39 is connected to the branch passage 37. 40 indicates a port on the air supply passage 25 side that is provided in the middle and communicates with the port 38.

The pressure increase piston drive switching valve 39 is driven in the direction of arrow D-D' based on the air pressure of the air supply source 15, and when the pressure increase piston 17 returns, the port 38 communicates with the atmosphere. The air in the forward pneumatic chamber 33 is discharged toward the atmosphere. Here, the air passage 25 has a branch passage 41 in addition to the branch passage 37,
The pressure increasing piston driving switching valve 39 is driven in the direction of arrow D' based on the supply of air from the branch passage 41. The upstream air passage 19 has a branching passage 42, and the pressure increasing piston driving switching valve 39 is driven in the direction of arrow D based on the supply of air from the branch passage 42, and the pneumatic pressure of the air supply source 15 is set to 5 kg/cm ² here, and the branch passage 4
2, a pressure regulating valve 43 is provided in the middle, and the air pressure from the branch passage 42 applied to the pressure-increasing piston drive switching valve 39 is slightly lower than the air pressure possessed by the air supply source 15. Here, the air pressure is set at 4 Kg/cm ² , and 44 indicates the pressure gauge. This pressure increasing piston drive switching valve 39 is operated by the arrow D' based on the fact that the air pressure in the branch passage 41 becomes higher than the air pressure in the branch passage 42 based on the return increase in air pressure in the pneumatic-hydraulic conversion chamber 24. The switching valve 39 for driving the pressure increasing piston is driven in the direction based on the pneumatic pressure in the branch passage 42.
When the force applied based on the pneumatic pressure of the branch passage 41 becomes greater than the force applied to the branch passage 41, the pressure increasing piston drive switching valve 39 is driven and the ports 38 and 40 are communicated with each other as shown in FIG. When the ports 38 and 40 are communicated with each other, air from the air supply source 15 flows into the forward pneumatic chamber 3.
3, the pressure increasing piston 17 is moved forward in the direction of arrow E, the hydraulic communication hole 36 is closed, and the supply of oil 27 from the pneumatic-hydraulic conversion chamber 24 to each hydraulic chamber 10 is stopped. At the same time, oil in the oil chamber 28 is supplied toward each hydraulic chamber 10, and each drilling piston 5 is driven by the pressure increasing piston 17 after the punch 8 comes into contact with the workpiece 2. In this case, the pressure increasing piston 17
The volume of the backward movement pneumatic chamber 32 decreases due to the forward movement of
Since the air is in communication with the atmosphere, it is discharged to the atmosphere via the downstream air passage 14.

When returning each drilling piston 5, the manual switch 23 is rotated in the direction opposite to the direction of arrow C. When the manual switch 23 is rotated in the direction opposite to the direction of arrow C, the air supply switching valve 18 is rotated.
is driven in the direction of arrow B, and ports 21 and 2
2 are communicated, and the port 26 is communicated with the atmosphere, and air from the air supply source 15 is supplied to the reciprocating pneumatic chamber 32 and the pneumatic chamber 11, and based on the air pressure, the drilling piston 5 and the The pressure piston 17 is driven in the return direction, and the oil in each hydraulic chamber 10 is returned to the oil chamber 28 based on the return movement of the pressure increase piston 17 and the drilling piston 5. Yes, the amount of oil returned to this oil chamber 28 is limited to the amount of oil returned to the workpiece 2 after the punch 8 contacts the workpiece 2.
This corresponds to the amount of oil supplied to each hydraulic chamber 10 by the pressure increasing piston 17 in order to drive each drilling piston 5 until drilling is performed.
When the pressure increasing piston 17 returns to its original position, the hydraulic communication hole 36 is opened, and each drilling piston 5 is subsequently moved back, and along with the return,
The oil 27 in the hydraulic chamber 10 is returned to the pneumatic-hydraulic conversion chamber 24 via the cylinder hydraulic passage 12.

Although the embodiments have been described above, the present invention is not limited thereto and includes the following.

In the embodiment, each drilling cylinder 5 and pressure increasing piston 17 are returned to their original positions based on the supply of air from the air supply source 15, but
Even if air supply is not used, each pneumatic chamber 11 is provided with a return spring, and the double-acting pneumatic chamber 32 is
It is also possible to have a configuration in which a return spring is provided in which the pressure increasing piston 17 and the drilling piston 5 are returned.

In the embodiment, the pressure-increasing piston drive switching valve 39 is biased in the direction of arrow D based on the air pressure supplied to the air supply passage 42, but the configuration is not limited thereto. It can also be configured to be biased in the direction of arrow D.

(Effects of the Invention) As explained above, the present invention provides oil supply from the pneumatic-hydraulic conversion cylinder to each cylinder chamber and oil supply from the second cylinder of the pressure boosting cylinder device to each cylinder chamber. Since the changeover between the oil supply and the oil supply is performed as the pressure of the air in the pneumatic/hydraulic conversion cylinder increases due to the contact of the punch with the workpiece, the driving timing of the pressure boosting cylinder device can be determined accurately. Electrically controlled oil supply from the pneumatic-hydraulic conversion cylinder to each cylinder chamber, and supply of oil from the second cylinder of the pressure boosting cylinder device to each cylinder chamber. Since each can be done without changing timing between the two, the configuration becomes simple.

Furthermore, in detail, even if the thickness of the workpiece changes, the switching timing can be changed in conjunction, and since switching to the pressure increasing cylinder device is only performed when all punches contact the workpiece, the punch Even if the initial height from the workpiece to the punch before descending varies from punch to punch, the punch timing can be accurately determined.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional configuration diagram showing the returning state of the punching device according to the present invention, FIG. 2 is a cross-sectional configuration diagram showing the punch in the punch in contact with a workpiece, and FIG. 3 is a cross-sectional configuration diagram showing the punch in the punching device according to the present invention. FIG. 2 is a cross-sectional configuration diagram showing a state of completion of drilling of the drilling device according to the present invention. 2...Work, 3...Cylinder device for drilling, 5
... Piston for drilling, 8 ... Punch, 10 ... Hydraulic chamber, 12 ... Hydraulic passage for cylinder, 13 ... Pneumatic-hydraulic conversion cylinder (pneumatic-hydraulic conversion means), 15
...Air supply source, 16...Cylinder device for pressure increase,
17... Pressure increase piston, 18... Air supply switching valve, 24... Air pressure/hydraulic conversion chamber, 25... Air supply passage, 27... Oil, 28... Oil chamber, 37...
Branch passage, 39...pressure increasing piston drive switching valve.

Claims (1)

[Scope of Claims] 1. Each cylinder chamber is provided with a reciprocating drilling piston, each drilling piston is formed with a drilling piston rod, and a tip of each drilling piston rod is formed. A punch for drilling a workpiece is attached to the cylinder chamber, and each of the cylinder chambers has an oil inflow/outflow hole through which oil flows in and out for driving each of the drilling pistons in the drilling direction of the punch, and a plurality of cylinder devices provided with a drilling piston return means for driving the drilling piston in a direction opposite to the drilling direction; and a first cylinder chamber into which air for reciprocating the pressure increasing piston is introduced. and a second cylinder chamber that is formed protruding from the pressure increase piston and into which a pressure increase piston rod having a diameter smaller than that is inserted, and
The cylinder chamber is divided into two chambers, a reciprocating pneumatic chamber on the protruding side of the pressurizing piston rod and a forward pneumatic chamber on the non-protruding side of the pressurizing piston rod, with the pressure increasing piston as a boundary; The moving pneumatic chamber is provided with a pressure increasing piston return means for driving the pressure increasing piston to a return position, and the forward moving pneumatic chamber is supplied with air pressure for moving the pressure increasing piston forward. An air pressure supply hole is provided in the second cylinder chamber to communicate with the oil inflow and outflow hole, and the oil in the second cylinder chamber is supplied to the cylinder chamber as the pressure-increasing piston rod moves forward. is provided with an oil inflow/outflow hole through which oil flows in and out through a downstream cylinder hydraulic passage, and an oil pressure communicating with the second cylinder chamber is provided at a position near the tip of the pressure increasing piston rod when the pressure increasing piston is in the return position. A pressure increasing cylinder device in which a communication hole is formed, and a pneumatic-hydraulic conversion cylinder having a sufficient amount of oil to operate the plurality of drilling pistons are provided, and the pneumatic-hydraulic conversion cylinder has a pressure increasing cylinder device for upstream cylinders. a pneumatic-hydraulic conversion means provided with a hydraulic hole communicating with the hydraulic communication hole via a hydraulic passage and a pneumatic communication hole for introducing pneumatic pressure; and a branch passage communicating with the pneumatic supply hole. have,
Switching is performed as the air pressure in the air chamber of the pneumatic-hydraulic conversion cylinder increases due to the punch coming into contact with the workpiece, and air pressure from an air supply source is supplied to the forward movement chamber of the first cylinder chamber. a switching valve for driving a piston for increasing pressure; when the switch is on, pneumatic pressure from the air supply source is supplied to the air chamber of the pneumatic-hydraulic conversion cylinder through the pneumatic communication hole to increase the pneumatic-hydraulic pressure; By supplying oil in the conversion cylinder to the cylinder chamber via the downstream cylinder hydraulic passage, the drilling piston is driven in the direction toward the workpiece until the punch comes into contact with the workpiece, and when the switch is turned off. A drilling device characterized by comprising an air supply switching valve that releases the air on the air chamber side of the pneumatic-hydraulic conversion cylinder and the air in the branch passage to the atmosphere.