JPH05131299A - Hydraulic punch press - Google Patents

Abstract

PURPOSE:To reduce the power loss of the press and to prevent the oil temperature from raising by calculating the operating pressure of a hydraulic actuator and operating the hydraulic actuator with the operation pressure. CONSTITUTION:A controller MMC32 for controlling the treatment operation reads the operating pressure data of each tool sorted by the material and the plate thickness from the host computer and the data of the tool used for each station. When the working station is designated by the working program of the controller CNC31 for controlling the work movement, the controller MMC32 calculates the operating pressure of the working station from both the two data, and transmits it to the controller PMC33 for controlling the hydraulic pressure. The controller PMC33 outputs the hydraulic pressure instruction to the pressure controlling part 50, and the pressure controlling part 50 gives the electric signal to the relief valve 51. In such a way, the hydraulic circuit is operated with the most proper operating pressure, by which the working of this station is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic punch press, and more particularly to a hydraulic punch press which drives a tool by a hydraulic actuator to machine a plate material.

[0002]

2. Description of the Related Art In recent years, a press machine such as a turret punch press machine for performing punching, drawing and the like on a work which is moved in a plane at high speed has been driven by a hydraulic actuator. .. In the punch press machine, hitherto, the hit rate of the mold is high, so that the punch press machine is limited to the crank type driven by a motor. However, due to improvements in hydraulic equipment, high-speed operation has become possible, and hydraulically driven punch press machines have come to be used.

In the hydraulically driven punch press machine, since the ascending / descending speed and stroke of the hydraulic actuator can be arbitrarily specified, low noise and low vibration are possible. Furthermore, the stroke of the hydraulic actuator can be minimized to improve the hit rate, and machining can be performed in a short time.

[0004]

In the conventional hydraulic punch press, the stroke and the lifting speed of the hydraulic actuator are controlled, but the working pressure is constant. For this reason,
When using a thin plate or a tool with a short circumference, the required pressure is smaller than the set pressure, causing loss of power,
The lost power turned into heat, causing an increase in oil temperature.

An object of the present invention is to prevent loss of power and increase in oil temperature.

[0006]

A hydraulic punch press according to the present invention is a machine for working a plate material by driving a tool by a hydraulic actuator, and is provided with a pressure calculating means and a hydraulic operating means. The pressure calculation means calculates the operating pressure of the hydraulic actuator based on at least one of the information about the tool and the information about the plate material. The hydraulic operating means is
The hydraulic actuator is operated with the operating pressure calculated by the pressure calculating means.

[0007]

In the hydraulic punch press according to the present invention, when the tool is driven by the hydraulic actuator to process the plate material,
The pressure calculation means calculates the operating pressure of the hydraulic actuator based on at least one information of the tool information and the plate material information. The hydraulic operating means operates the actuator at the operating pressure calculated by the pressure calculating means.

Therefore, since the plate material is always processed at the optimum operating pressure, the loss of power is small and the oil temperature can be prevented from rising.

[0009]

1 and 2 show a hydraulic punch press according to an embodiment of the present invention. Here, a turret punch press machine is taken as an example. The punch press machine 1 is mainly composed of a lower frame 2, an upper frame 3 arranged above the lower frame 2, and a throat portion 4 for supporting the upper frame 3 at the rear.

A fixed table 10 is arranged in the center of the upper surface of the lower frame 2. A pair of guide rails 5 and 6 are arranged on both sides of the upper surface of the lower frame 2.
A carriage 7 is arranged on the guide rails 5 and 6 so as to be movable in the depth direction (Y-axis direction). Moving tables 8 and 9 arranged on both sides of the fixed table 10 are fixed to the carriage 7. The carriage 7 has a pair of work holders 13, 14 for holding the plate material 11.
The cross slide 15 to which is attached is provided so as to be movable in the left-right direction (X-axis direction).

A moving mechanism for moving the carriage 7 in the Y-axis direction is arranged below the moving table 9. The moving mechanism includes a servo motor 16, a ball screw 17 connected to the servo motor 16, and a ball nut 18 screwed to the ball screw 17. The ball nut 18 is fixed to the lower surface of the moving table 9. On the other hand, a moving mechanism that moves the cross slide 15 in the X-axis direction is arranged inside the carriage 7. The moving mechanism is composed of a servo motor 20 arranged at one end of the carriage 7, a ball screw 21 connected to the servo motor 20, and a ball nut 23 screwed onto the ball screw 21. The ball nut 23 is fixed to the cross slide 15.

An upper turret 12 for accommodating a plurality of punches is rotatably provided on the upper frame 3. Inside the upper turret 12, a punch head that is moved up and down by a hydraulic cylinder (described later) is provided. On the other hand, on the lower frame 2 side, a lower turret 22 that houses a plurality of dies is arranged to face the upper turret 12. Further, the processing section 24 is constituted by the punch, the die and the like in the processing position.

A control device 30 is provided in the throat section 4 as shown in FIG. The controller 30 includes a CNC 31, an MMC 32, and a PMC 3 as controllers.
Equipped with 3. Data is transmitted and received at high speed between the controllers via a window.
The CNC 31 controls the servomotors 16 and 20 for moving the plate material 11 in the X-axis direction and the Y-axis direction, and includes a CPU, a ROM, a RAM, and the like. M
The MC 32 is capable of performing various kinds of processing using a high-level language, and includes a CPU, ROM, RAM and the like. The PMC 33 controls hydraulic pressure and turret drive, and includes a CPU, a ROM, a RAM, and the like.

DSC for MMC32 and PMC33
A (digital servo controller) 36 is connected. The DSC 36 is a controller for servo-controlling the position and speed of the hydraulic cylinder 40.
2 and a speed command to the speed control unit 38 according to the position information and the speed information given from the PMC 33. The speed control unit 38 is for feedback-controlling the processing speed of the processing unit 24 (the ascending / descending speed of the cylinder 40) according to the speed command given from the DSC 36, and is composed of a speed amplifier and an integrating circuit. .. In addition, PMC35
A pressure control unit 50 is connected to. Pressure control unit 50
Is for controlling the pressure of the hydraulic cylinder 40.

A hydraulic cylinder 40 (FIG. 3) is vertically arranged on the processing section 24 (FIG. 2). Hydraulic cylinder 4
An engaging portion 42 with which the head of the punch 41 forming the processing portion 24 can be engaged is attached to the tip of the piston rod 0. An electrohydraulic 3-position 4-port servo valve 44 is connected to the hydraulic cylinder 40. A servo control coil 45 and a feedback detector 46 are provided on the spool of the servo valve 44. A control signal from the speed control unit 38 is input to the servo control coil 45. Further, the detection signal of the feedback detector 46 is input to the speed control unit 38, and the movement amount of the spool is feedback-controlled by the speed control unit 38. As a result, the flow rate passing through the servo valve 44 is controlled, and the ascending / descending speed of the hydraulic cylinder 40 is controlled. Further, the hydraulic cylinder 40 is provided with a position detector 47 that detects the position of the piston. The output of the position detector 47 is sent to the DSC via the A / D converter 48.
36 has been entered.

On the other hand, a pressure command is given from the PMC 33 to the pressure control unit 50. The pressure control unit 30 converts this into an electric signal and gives it to the proportional electromagnetic relief valve 51. Further, the relief valve 51 is connected to a hydraulic circuit 54 including a pump 52 and a motor 53 that drives the pump 52. A hydraulic device 55 for controlling other actuators is connected to the hydraulic circuit 54. The hydraulic line of the hydraulic circuit 54 is connected to the servo valve 44.

As shown in FIG. 4, the MMC 32 is connected with a keyboard 34, a CRT 35, a host interface 37 for connection with a host computer, and other input / output units. An axis control unit 39 for controlling the X axis and the Y axis is connected to the CNC 31. Further, the PMC 33 has an upper turret 12 and a lower turret 2.
A turret drive unit 19 for driving the motor 2 and other input / output units are connected.

In the RAM in the MMC 32, a tool table indicating the relationship between the turret station number and the tool is stored in advance in the RAM from the host computer, as shown in FIG. A pressure table showing the relationship with the maximum operating pressure has been transferred. That is,
The host computer gives the relationship between the plate thickness for each material, the tool and the working pressure, and the relationship between the station number and the tool. They are stored in this RAM. During machining, when a station number is given, the tool is read from the tool table, and when a plate thickness is given, the working pressure is read from the pressure table by the given plate thickness and the read tool. The read operating pressure is PMC33.
Given to.

Next, the control operation of the control device 30 will be described with reference to the control flowchart shown in the drawing. First, in step S1, initial settings such as movement to the origin of the table are performed. In step S2, the processing information is read from the host computer via the host interface 37. In step S3, the machining program is also read from the host computer. The processing information read here includes information about the plate thickness and its material, and is stored in the RAM in the MMC32. Further, the machining program is stored in the RAM in the CNC 31.

In step S4, a work start command by the worker operating the work start button is awaited. When the work start is input, the process proceeds to step S5. In step S5, the steps of the machining program are read step by step. In steps S6 to S8, the content of the read step is determined. That is, in step S6, it is determined whether the content of the read step means a machining command. In step S7, it is determined whether or not it means another command. In step S8, it is determined whether or not the end command is meant.

When it is determined in step S6 that the step means a machining command, the process proceeds to step S9. In step S9, it is determined whether the read machining command includes a T code. This T code indicates the station number of the turrets 12 and 22, and the relationship between this station number and the tool is MM as described above.
It is stored in the RAM in C32. If it is determined that the T code is included, the process proceeds to step S10.
In step S10, the tool is read from the tool table stored in the RAM of the MMC 32 from the T code. In step S11, the maximum working pressure corresponding to the tool shape, plate thickness and material is obtained from the pressure table shown in FIG. 5 based on the read tool and the plate thickness and material included in the processing information. In step S12, a pressure command corresponding to the obtained operating pressure is given to the pressure control unit 50 via the PMC 33 to set the pressure of the relief valve 51. When it is determined in step S9 that the T code is not included, or when the pressure setting process in step S12 ends, the process proceeds to step S13. In step S13, the hydraulic cylinder 40 is lowered to perform punching.

On the other hand, when it is determined in step S7 that it means another command, the process proceeds to step S14. In step S14, other processing according to the read instruction is performed. In this way, the optimum working pressure is calculated according to the shape of the tool, the material and the thickness of the plate material, and the pressure of the hydraulic device is set by this, so power loss does not occur much. [Other Embodiments] (a) In the above embodiments, the pressure is set according to the shape of the tool, the material and thickness of the plate material, but at least one of these may be used. (B) In the above embodiment, the working pressure is obtained from the table, but the working pressure may be obtained by calculation. For example, the working pressure may be calculated using a predetermined calculation formula based on the plate thickness, the material, and the tool shape.

[0023]

In the hydraulic punch press according to the present invention, the operating pressure of the hydraulic actuator is calculated based on at least one of the tool information and the plate material information, and the hydraulic actuator is operated accordingly. It is possible to operate the hydraulic actuator with operating pressure,
Power loss is reduced and oil temperature rise is reduced.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a hydraulic punch press according to an embodiment of the present invention.

FIG. 2 is a schematic plan view thereof.

FIG. 3 is a schematic block diagram of a control device of a hydraulic punch press.

FIG. 4 is a block diagram of a control device.

FIG. 5 is a view showing an MMC pressure table.

FIG. 6 is a control flowchart of the control device.

[Explanation of symbols]

 1 Punch Press Machine 24 Machining Section 30 Control Device 32 MMC 33 PMC 40 Hydraulic Cylinder 41 Punch 43 Die 50 Pressure Control Section 51 Relief Valve

Claims (1)

[Claims] 1. A hydraulic punch press for driving a plate material by driving a tool with a hydraulic actuator, the pressure for calculating an operating pressure of the hydraulic actuator based on at least one information of the tool information and the plate material information. A hydraulic punch press comprising: a calculating unit; and a hydraulic operating unit that operates the hydraulic actuator at the operating pressure calculated by the pressure calculating unit.