JPH069703Y2 - Press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a press machine, and more specifically, to a hydraulic cylinder for vertically moving a striker that presses a punch.
The present invention relates to a press machine that is a step type and has a punching speed that is moderate.

(Prior Art) Conventionally, in a press machine, the punching speed has been a major factor for noise. That is, it is possible to suppress the noise to a low level by reducing the processing speed, but productivity is not improved when the processing speed is reduced. Therefore, the press function was decided by checking the noise amount and the surrounding environment and pressing the amount so that the surrounding environment would not deteriorate.

(Problems to be Solved by the Invention) In the above-mentioned conventional press machine, the mechanical press has a constant punching speed, and the noise is at a high level. In a press using a hydraulic cylinder, noise can be suppressed to some extent by controlling the hydraulic cylinder, but the proportional control valve is often used and control is complicated. There was a problem that would be high.

[Structure of the Invention] (Means for Solving the Problems) In view of the conventional problems as described above, the present invention provides a press machine including a hydraulic cylinder for vertically moving a striker for pressing a punch. , The hydraulic cylinder is provided with a small diameter cylinder in an upper part and a large diameter cylinder in a lower part, and the striker is connected to a large diameter piston provided in the large diameter cylinder so as to be movable up and down, and the small diameter cylinder is vertically moved. A movably equipped small-diameter piston is provided so as to be able to descend integrally with the large-diameter piston from the top dead center position of the large-diameter piston to a predetermined lowered position, and communicates with the upper pressure chamber of the small-diameter cylinder. The communication passage provided in the small-diameter piston communicates with the large-diameter cylinder when the small-diameter piston descends to the predetermined lower position.

(Operation) With the above configuration, when pressure oil is supplied to the small-diameter cylinder when the striker is lowered, the small-diameter piston of the small-diameter cylinder descends at a high speed, and the large-diameter piston is integrally lowered, so that high-speed descending is performed. Then, when it descends to a predetermined position, the communication passage provided in the small diameter piston communicates with the upper pressure chamber of the large diameter cylinder, and the pressure oil flows into the large diameter cylinder.

Therefore, the descending speed of the piston of the large diameter cylinder becomes slow.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

For ease of understanding, the overall configuration of the press machine will be briefly described.

Referring to FIG. 2, a punch press machine 1 as a press machine is integrally configured with a lower frame 3, left and right columns 5, 7 and an upper frame 9 in a gate shape. A shaft 11 provided on the lower frame 3 between the lower frame 3 and the upper frame 9 has a rotatable lower turret 13, and a shaft 15 provided downwardly on the upper frame 9 has a rotatable upper turret 13. 17 are supported respectively. Moreover, the lower turret 13 and the upper turret 17 are adapted to be rotated in synchronization with each other.

A plurality of punches 19 are provided on the circumference of the upper turret 17.
However, a die 21 is mounted on the circumference of the lower turret 13 at a position corresponding to the punch 19. A hydraulic cylinder 23 is provided in the upper frame 9, and a striker 25 that can press the punch 19 is provided at the lower end of the piston rod in the hydraulic cylinder 23.

A Y-axis drive motor 27 such as a pulse motor is provided on the right side of the lower surface of the upper frame 9, and a ball screw 29 interlockingly connected to the Y-axis drive motor 27.
Are extended in the Y-axis direction (left and right direction in FIG. 2). A nut member 31 is screwed onto the ball screw 29, and a carriage base 33 movable in the Y-axis direction is integrally provided on the nut member 31.

The carriage base 33 is provided with a ball screw 35 driven by an X-axis drive motor (not shown), and a plurality of carriages 37 are provided through nut members (not shown) screwed to the ball screw 35. Guide rail 39
And is moved and positioned in the X-axis direction (direction orthogonal to the paper surface in FIG. 2).

A plurality of work clamps 41 are provided on the turret side of the carriage 37, and the carriage base 33 has a fixed table 43 at the center on the lower frame 3.
Is moved in the Y-axis direction by straddling a moving table 47 guided by a Y-axis direction guide rail 45 provided on the side of the.

With the above configuration, the work W clamped by the work clamp 41 is operated by the hydraulic cylinder 23 to move the punch 19 up and down through the striker 25, whereby the punch 19 and the die 21 cooperate with each other to perform a desired punching process. At the same time, the work W is moved in the X-axis and Y-axis directions, so that the work W is subjected to a plurality of punching processes.

A concrete structure of the hydraulic cylinder 23 is shown in FIG. That is, in FIG. 1, the hydraulic cylinder 23
Is a small diameter cylinder 49 at the top and a large diameter cylinder 5 at the bottom.
1 is provided.

Small diameter piston 53 in small diameter cylinder 49 provided at the top
Has a hole 57 as a communication passage communicating with the upper pressure chamber 55.
A lateral hole 59 is formed in the hole 57 at a predetermined position.

On the other hand, the striker 25 is connected to the large-diameter piston 61 in the large-diameter cylinder 51 provided in the lower portion. The lower surface of the piston 53 of the small diameter cylinder 49 is in contact with the upper surface of the piston 61.

In this embodiment, the large diameter cylinder 51 and the small diameter cylinder 4 are
Although the pistons 61 and 53 of 9 are separate bodies, they may be provided integrally. The reason is that the position of the lateral hole (communication passage) 59 provided in the piston 53 of the small diameter cylinder 49 is different from that of the piston 53. This is because only the piston 53 of the small-diameter cylinder 49 needs to be replaced when changing the shift position for descending, which is advantageous in terms of cost.

The predetermined position of the lateral hole 59 provided in the piston 53 of the small-diameter cylinder 49 described above means that the punch 1 is formed on the workpiece (workpiece W).
When 9 comes close to each other, the lateral hole 59 enters the upper pressure chamber 63 of the large diameter cylinder 51 and is opened, so that the pressure oil is discharged into the small diameter cylinder 4
It is set at a position where it flows from the upper pressure chamber 55 of 9 through the lateral hole 59 through the hole 57.

The operation of the above configuration will be described with reference to the hydraulic system diagram shown in FIG.

The hydraulic oil in the tank 65 is sent by a hydraulic pump 69 via a filter 67, and a relief valve 71 with a pilot is provided on the outlet side of the hydraulic pump 69 so that the hydraulic oil is supplied to the tank 65 when a predetermined pressure is reached. Relieved. Further, an electromagnetic switching valve 73 is provided between the hydraulic pump 69 and the hydraulic cylinder 23, and the electromagnetic switching valve 73 includes a solenoid 75A and a solenoid 7A.
The flow path is switched by turning ON / OFF 5B.

When the hydraulic cylinder 23 descends at a high speed, the solenoid 75A of the electromagnetic switching valve 73 is turned on, and the hydraulic pump 69 sends pressure oil into the upper pressure chamber 55 of the small diameter cylinder 49 to push down the fixer 53. Piston 53 of small diameter cylinder 49
Descends at a high speed, the piston 61 of the large-diameter cylinder 51 is also integrally pressed and descended, and the upper pressure chamber 63 of the large-diameter cylinder 51 is brought into a negative pressure state. The check valve 79 which is normally closed is opened to suck the hydraulic oil from the tank 65.

When the piston 53 of the small-diameter cylinder 49 reaches a predetermined position, that is, the striker 25 lowers the punch 19 and the punch 19 reaches a position close to the work material, the pressure oil in the upper pressure chamber 55 of the small-diameter cylinder 49 becomes a hole 57. And side hole 59
And flows into the upper pressure chamber 63 of the large diameter cylinder 51. The pressure oil that has flowed into the upper pressure chamber 63 of the large-diameter cylinder 51 increases the cylinder volume, so that the pressing force increases and the piston 61 slows down to start punching.

After the punching process is completed, the solenoid of the solenoid operated directional control valve 73 is switched, the solenoid 75A is turned off, the port of the solenoid operated directional control valve 73 is set to the neutral position, and the pistons 53 and 61 are stopped.

After the stop, by turning on the solenoid 75B of the electromagnetic switching valve 73, oil is fed into the lower pressure chamber 81 of the large diameter cylinder 51, and the pistons 61 and 53 rise. At this time, the hydraulic oil in the upper pressure chamber 63 of the large diameter cylinder 51 returns to the tank 65 by opening the check valve 83, and the hydraulic oil in the upper pressure chamber 55 of the small diameter cylinder 49 also returns to the tank 65. The piston 61 of the large-diameter cylinder 51 moves up.

When it reaches the top dead center, the solenoid 75B of the electromagnetic switching valve 73
Is turned off, the electromagnetic switching valve 73 returns to the neutral position, and the piston 61 of the large diameter cylinder 51 and the piston 53 of the small diameter cylinder 49 stop.

As described above, by combining the cylinders 49 and 51 having different inner diameters, it is possible to perform fast feed with a small discharge amount, perform high-speed approach and low-speed punching processing, and reduce noise without lowering punching ability. . Moreover, many proportional control valves are not required, and the equipment cost can be reduced with a simple configuration.

(Effects of the Invention) As will be understood from the above description of the embodiments, in short, the present invention provides a press machine including a hydraulic cylinder 23 for vertically moving a striker 25 that presses a punch, and uses the above hydraulic pressure. The cylinder 23 has a small diameter cylinder 4 at the top.
9, a large-diameter cylinder 51 is provided at the bottom, and a large-diameter piston 61 is provided on the large-diameter cylinder 51 so as to be vertically movable.
A small-diameter piston 53 provided on the small-diameter cylinder 49 so as to be vertically movable, and a large-diameter piston 61 from the top dead center position of the large-diameter piston 61 to a predetermined descending position. The small-diameter piston 53 descends to the predetermined descending position through communication passages 57 and 59 provided integrally with the small-diameter cylinder 49 so as to communicate with the upper pressure chamber 55 of the small-diameter cylinder 49 and provided in the small-diameter piston 53. Sometimes, it is configured to communicate with the large diameter cylinder 51.

Therefore, according to the present invention, when punching a workpiece, the small diameter cylinder performs high-speed lowering, and when the punch is close to the workpiece, the punch lowers at a low speed and presses the large diameter cylinder to perform high-speed approaching. Moreover, low-speed punching can be performed, and noise can be prevented without lowering the punching ability.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a cylinder showing an essential part of the present invention and a hydraulic system explanatory view, and FIG. 2 is a front view of a punch press machine of an embodiment for carrying out the present invention. 1 ... Punch press machine, 23 ... Hydraulic cylinder 49 ... Small diameter cylinder, 51 ... Large diameter cylinder 53 ... Piston, 55 ... Upper pressure chamber 57 ... Communication passage, 59 ... Communication passage 63 ... Upper part Pressure chamber

Claims (1)

[Scope of utility model registration request] 1. A press machine comprising a hydraulic cylinder (23) for vertically moving a striker (25) for pressing a punch, said hydraulic cylinder (23) having a small diameter cylinder (49) in an upper part and a lower part. The large-diameter cylinder (51) is provided to the large-diameter cylinder (51), and the striker (25) is attached to the large-diameter piston (61) provided on the large-diameter cylinder (51) so as to be vertically movable.
And a small-diameter piston (53) that is vertically connected to the small-diameter cylinder (49) and has a large diameter from the top dead center position of the large-diameter piston (61) to a predetermined descending position. A communication passage (57, 57) provided integrally with the small diameter cylinder (49) and communicating with the upper pressure chamber (55) of the small diameter cylinder (49) and provided in the small diameter piston (53).
59) The press machine characterized in that the small diameter piston (53) communicates with the large diameter cylinder (51) when the small diameter piston (53) descends to the predetermined lowered position.