JPH07164056A - Method and device for automatically setting original point position of die for motor-driven bender - Google Patents

Abstract

PURPOSE:To enable the original point position of a die to be set highly accurately, automatically and efficiently without the requirement of experience. CONSTITUTION:A movable table is driven by a motor, and bending is performed by a die attached to the movable table and a die attached to a fixed table. A pressure applied between the dies is detected by a pressure sensor 17, comparison and discrimination are made if the pressure detected by the pressure sensor 17 has reached the normal predetermined value, and if the pressure thus detected has reached such value, the motor 13 is automatically stopped and the original point position of the die is set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic die origin position setting method and apparatus for an electric bender.

[0002]

2. Description of the Related Art A movable table is driven by an electric motor,
BACKGROUND ART An electric bender that performs a bending process using a mold mounted on the movable table and a mold mounted on a fixed table has been conventionally known.

In the bender, the movable table moves, and the table position at which a predetermined pressure acts between the molds is defined as the mold origin position.

The setting of the die origin position in the electric bender is performed by inputting the position command pulse by the manual operation of the operator of the manual pulser provided on the operation panel as the D-axis position control of the servo control system. Drive the electric motor for driving, monitor the operator by looking at the pressure display on the numerical control device to see if the prescribed pressure has acted, and when the pressure display reveals that the prescribed pressure has acted, perform manual operation manually. Stop the position command pulse by the pulsar,
This is done by manually stopping the drive of the electric motor.

[0005]

Since the setting of the mold origin position as described above is performed manually by the operator, it requires experience, takes a long time, and the variation occurs depending on the operator. It is difficult to set.

The present invention has been made by paying attention to the above-mentioned problems, and is an electric drive system for automatically and efficiently setting the die origin position without experience. It is an object of the present invention to provide a vendor automatic die origin setting method and an apparatus used for implementing the method.

[0007]

According to the present invention, the movable table is driven by an electric motor and is bent by a mold attached to the movable table and a mold attached to the fixed table. In the automatic die origin position setting method of the electric bender for processing, the pressure acting between the dies is detected by the pressure sensor, and whether the pressure detected by the pressure sensor has reached a preset specified value. If the pressure detected by the pressure sensor reaches a preset specified value, the electric motor is automatically stopped to set the mold origin position. This is achieved by the automatic mold origin position setting method.

In order to achieve the above-mentioned object, in the automatic die origin position setting device of the electric bender according to the present invention, the movable table is driven by the electric motor, and the movable table is mounted on the die and the fixed table. In an automatic mold origin position setting device of an electric bender that performs bending processing with a mounted mold, a pressure sensor that detects a pressure acting between the molds and a pressure detected by the pressure sensor are set in advance. And a comparator for judging whether or not the specified value has been reached, and a comparison indicating that the pressure detected by the pressure sensor by inputting a comparison judgment signal from the comparator has reached a preset specified value. And a motor control means for automatically stopping the motor by inputting a determination signal.

[0009]

According to the above-mentioned structure, the pressure acting between the molds is monitored by the pressure sensor, and if the pressure detected by this pressure sensor reaches the preset specified value,
The electric motor is automatically stopped and the mold origin position is automatically set.

[0010]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 4 shows a schematic configuration of an electric bender to which the automatic die origin position setting method according to the present invention is applied.

The electric bender has an upper movable table 1 which can be moved up and down and a lower fixed table 3 which is fixedly arranged.
An upper mold 5 is fixedly mounted on the lower end of the upper movable table 1, and a lower mold 7 is fixedly mounted on the upper end of the lower fixed table 3 in a fixed arrangement.

The upper movable table 1 is connected to a ball screw 9, and a ball nut 11 is screwed onto the ball screw 9. The ball screw 9 moves in the axial direction, that is, the vertical direction by the rotation of the ball nut 11, and drives the upper movable table 1 in the vertical direction.

The ball nut 11 is drivingly connected to a servo motor 13, and is driven by the servo motor 13 to rotate forward and backward. The operation of the servo motor 13 is controlled by the servo controller 15.

A pressure sensor 17 such as a load cell and a strain cage is attached to the upper movable table 1, and the pressure sensor 17 is a pressure acting on the upper table 1.
In other words, the pressure acting between the upper mold 5 and the lower mold 7 is detected, and the pressure signal is output to the servo control device 15.

The servo control device 15 includes an automatic mold origin position setting device according to the present invention, a concrete example of which is shown in FIG.
Is shown in. The servo control device 15 includes the position control unit 1
9, a speed control unit 21, a current control unit 23, a power amplifier 25, and a comparator 27.

As shown in FIG. 2, the position control unit 19 inputs a movement amount command output from the NC device 29 via the speed command pattern generation unit 31, and counts the number of pulses of the movement amount command. A value counter 33, a position feedback signal (pulse signal) from a position sensor 35 such as an encoder that detects the rotation amount of the servo motor 13, and a movement value counter 37 that counts the number of pulses as a movement value, and a command value counter. A deviation counter 39 that counts the deviation between the position command output by 33 and the number of pulses output by the movement value counter 37, a drift correction unit 41 that is connected in parallel with the deviation counter 39, and an output gain setting unit 43.
The output gain setting unit 43 outputs a speed command according to the position deviation to the speed control unit 21.

The speed control unit 21 inputs a speed command from the position control unit 19 and a speed feedback signal from a speed sensor 45 such as a tachogenerator connected to the servomotor 13, and outputs a manipulated variable signal based on a deviation between the two. Output to the current control unit 23.

The current control section 23 receives the manipulated variable signal from the speed control section 21 and the current feedback signal from the power amplifier 25, and outputs a current value command based on the deviation between the two to the power amplifier 25.

The power amplifier 25 inputs a current value command from the current controller 23, amplifies the current according to the current value command, and energizes the servo motor 13.

The comparator 27 receives the pressure signal from the pressure sensor 17, compares and determines whether or not the pressure indicated by this pressure signal has reached a preset specified pressure value, and outputs the comparison determination signal to the position controller. It outputs to the command value counter 33 of 19.

The command value counter 33 counts the command value and operates normally when the comparison judgment signal indicating that the pressure detected by the pressure sensor 17 has reached the preset specified pressure value is not input. However, by inputting the comparison determination signal indicating that the pressure detected by the pressure sensor 17 has reached the preset specified pressure value from the comparator 27, the counting of the command value is stopped and the position command is held. To do.

As a result, when the pressure detected by the pressure sensor 17 reaches the preset specified pressure value, the operation of the servomotor 13 is automatically stopped and the mold origin position is automatically set.

FIG. 3 shows another embodiment of the servo control device 15 including the automatic die origin position setting device according to the present invention. In FIG. 3, the parts corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals as those in FIGS. 1 and 2.

In this embodiment, the speed control unit 21 has a clamp circuit 49 to which a torque command (manipulation amount signal) is inputted from the proportional gain setting unit 47 and a comparison judgment signal is given from the comparator 27.

The clamp circuit 49 clamps the torque command by inputting from the comparator 27 a comparison determination signal indicating that the pressure detected by the pressure sensor 17 has reached a preset specified pressure value.

As a result, when the pressure detected by the pressure sensor 17 reaches the preset specified pressure value, the operation of the servo motor 13 is automatically stopped, and the mold origin position is automatically set.

In FIG. 3, reference numeral 51 is a gain of the hower amplifier, and reference numeral 53 is a current detector.

In the above-mentioned embodiment, the pressure acting between the molds is detected by the pressure sensor 17 such as the load cell and the strain cage provided on the upper movable table 1, and the pressure is detected by the servo motor 13. The load current may be measured.

In the above, the present invention has been described in detail with reference to specific embodiments, but the present invention is not limited to these, and various embodiments can be made within the scope of the present invention. It will be apparent to those skilled in the art.

[0030]

As can be understood from the above description, according to the automatic mold origin position setting method and device for the electric bender according to the present invention, the pressure between the molds detected by the pressure sensor is defined in advance. When the value is reached, the electric motor is automatically stopped and the mold origin position is automatically set. Therefore, the mold origin position can be set efficiently and accurately without experience.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an electric bender servo control system including an automatic die origin position setting device according to the present invention.

FIG. 2 is a block diagram showing in detail a main part of a control system of an electric bender servo including an automatic die origin position setting device according to the present invention.

FIG. 3 is a block diagram showing another embodiment of the control system of the electric bender servo including the automatic die origin position setting device according to the present invention.

FIG. 4 is a schematic configuration diagram showing an embodiment of an electric bender to which the automatic mold origin position setting device according to the present invention is applied.

[Explanation of reference numerals] 1 upper movable table 3 lower fixed table 5 upper mold 7 lower mold 13 servo motor 15 servo control device 17 pressure sensor 19 position control unit 21 speed control unit 23 current control unit 25 power amplifier 27 comparator

Claims (2)

[Claims] 1. A movable table is driven by an electric motor,
In an automatic die origin position setting method of an electric bender that performs bending with a die attached to the movable table and a die attached to a fixed table, a pressure sensor detects pressure acting between the die. Then, it is determined whether or not the pressure detected by the pressure sensor has reached a preset specified value, and if the pressure detected by the pressure sensor reaches a preset specified value, then An automatic mold origin position setting method for an electric bender characterized by automatically stopping the electric motor and setting the mold origin position. 2. The movable table is driven by an electric motor,
In an automatic mold origin position setting device of an electric bender that performs bending with a mold mounted on the movable table and a mold mounted on a fixed table, a pressure sensor for detecting a pressure acting between the molds. And a comparator that determines whether or not the pressure detected by the pressure sensor has reached a preset specified value, and a comparison determination signal is input from the comparator, and the pressure detected by the pressure sensor And an electric motor control means for automatically stopping the electric motor by inputting a comparison determination signal indicating that a predetermined specified value has been reached, the automatic die origin of the electric bender. Position setting device.