JPH0116239B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a press control method for a press machine controlled by an electronic rotary cam switch, and a press control device related to the press control method. In recent years, a method of controlling a press machine (hereinafter simply referred to as a press) using an electronic rotary cam switch instead of a mechanical cam has become common practice. That is, an angle detector such as a synchro oscillator or a pulse encoder is installed on the crankshaft that is mechanically connected to the press shaft, and the rotary cam switch is turned on based on the angle data output from the angle detector. The angle and cutting angle are set and controlled electronically, and various controls of the press are performed based on the controlled operating mode of the rotary cam switch. In addition, since a DC motor that can freely change the speed of the press has come to be used as the main motor for driving the press, the tachometer generator installed in this DC motor is used as the speed detector of the press. In recent years, so-called automatic advance angle control has also become common practice in which the voltage corresponding to the rotational speed of the DC motor outputted from the tachogenerator is further converted into a coasting angle to control the advance angle of the rotary cam switch. However, in many of these conventional press control methods or control devices related to such control methods, (a) the turning angle and cut angle of the rotary cam switch are all set by a digital switch installed in the setting device of the control device; Because it is carried out by
Requires a huge number of switches. Therefore, not only the operability and reliability are lowered, but also there is a big disadvantage in terms of economy and setting device panel space. (b) Since the automatic advance angle of the rotary cam switch is set using a variable resistor, it is difficult to set it accurately. (c) Since the output voltage of the tachogenerator set on the main motor shaft (corresponding to the rotational speed of the main motor) is used as the speed signal of the press, the clutch connecting the press and the main motor is If slippage occurs (which may occur immediately after the clutch is turned on and off), the speed signal will not correspond to the actual press speed. Therefore, accurate automatic advance angle control of the rotary cam switch may be hindered. (d) The circuit configuration is complicated because the output voltage of the variable resistor for automatic advance angle setting mentioned in (b) is converted into a digital signal by an A/D (analog/digital) converter via an analog multiplexer. Therefore, it is economically disadvantageous. (E) When setting the automatic advance angle of the rotary cam switch, the output voltage of the tachogenerator is required, and even when the press itself is not operating, only the main motor must be kept operating. Therefore, it is dangerous and also leads to waste of electricity. Further, the motor speed must be changed in accordance with the automatic advance angle of the rotary cam switch to be set, which is cumbersome to operate. (f) Since the automatic advance angle of the rotary cam switch is controlled by a one-line approximation, it has become difficult to handle it accurately when applied to modern presses that operate at a wide range of speeds. It had various drawbacks such as. An object of the present invention is to provide a press control method and a press control device that can significantly reduce the time required for press operation settings and enable safe and highly accurate press operation by eliminating the various drawbacks mentioned above. shall be. According to the present invention, (1) The turning angle and cutting angle of the rotary cam switch are set in advance through a numeric keypad or the like, and the set values are stored in a memory provided in the control device. (2) All information related to the automatic advance angle of the rotary cam switch is digitized, and this information is also stored in the memory provided in the control device. (3) The automatic advance angle is controlled based on the advance angle correction calculation performed by a microcomputer based on the information stored in the memory and the calculated value. (4) The automatic advance angle control described in (3) is computer-controlled so that not only one-line approximation but also more accurate approximation can be performed as necessary. (5) Speed detection is performed using the output signal (angle data) of the angle detector that outputs the operation signal related to the actual press operation, without using the tachometer generator installed in the main motor. (6) Using a pseudo speed signal, set and adjust the automatic advance angle without operating the press or motor at all. This controls various aspects of the press. Hereinafter, a press control method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing one embodiment of a press control device according to the present invention. This embodiment device includes a synchro oscillator 200 disposed on a press shaft 100 (a shaft to which press motion is mechanically transmitted from the crankshaft), and angle data AD output from the synchro oscillator 200 (actual press a control unit 30 that receives the
0, and an operation panel unit 400 that inputs various data to the control unit 300. Various data input from the operation panel unit 400 and angle data AD added from the synchro oscillator 200 The control unit 300 performs calculations based on the calculation, and the calculation signals resulting from the calculations are used as cam signals.
Add it to the press controller (not shown) as CAM. The cam signal CAM is a signal indicating the on/off state and advance angle amount of the cam at each operating position of the press shaft 100. In addition, the control unit 30
A control signal indicating the control mode etc. is output from 0, and this signal is also applied to the press controller. The press controller is a well-known control device that directly controls various operations of the press based on the control signal and cam signal CAM sent from the control unit 300 of the rotary cam switch,
From the press controller to the control unit 30
A press operation signal PC, which is a confirmation signal for the press operation, is sent to the input terminal 0. The operation panel unit 400 also stores pseudo speed data NSD used when setting the automatic advance angle.
It is equipped with a speed setting digital switch 401 for setting the speed, a keyboard 403 for switching control modes and setting various data, and a display 405.
The set values, or each value of the rotary cam switch's entry angle, cutting angle, advance angle speed, etc. processed by the control unit 300, as well as various pilots related to this press control, are all visually displayed on the display 405. . An example of the operation panel of this operation panel unit 400 is shown in FIG. That is, switching of control modes and setting of various data are performed by each switch disposed on the keyboard section, and the progress and results are displayed in lamps or digitally on the display section. These specific operation examples and display examples will be described later. In addition,
In this embodiment device, the speed setting digital switch 401 also uses the number key NK of the keyboard section, and when the speed key switch SK is turned on and the number key NK is turned on, the number key NK is turned on. Pseudo speed data NSD with a value corresponding to the number is output. Furthermore, in the apparatus shown in FIG. 1, the press shaft 10
The press speed is detected using the output angle data AD of the synchro oscillator 200 that detects the zero rotation angle. That is, the operating speed of the press shaft 100 is 0~
If the speed is 80 spm (stroke/min), the angular displacement per second is 0 to 480°/s.
(degrees/second), and the operating speed of the press shaft 100 can be obtained as angle data AD. As mentioned above, this angle data AD corresponds to the accurate press speed in accordance with the actual operation of the press, and by correcting the advance angle of the rotary cam switch based on this angle data AD, high precision can be achieved. Press control becomes possible. Next, the control unit 300 will be explained. First, a CPU (central processing unit) 310, which is the main part of the control unit 300, and its peripheral circuits will be explained. A clock generator 311 generates an operating clock pulse φ1 for the CPU 310 and a clock pulse φ2 for interrupt control. Of course, these clock pulses φ1 and φ2 may be the same pulse. The CPU 310 executes the program stored in the program memory 316 based on the clock pulse φ (see flowcharts 5 to 1 to be described later).
This is a central processing unit that performs the arithmetic processing described below by reading out various data stored in the data memory 317 (see FIG. 1) and the data memory 317, and freely accesses each circuit described below. Of these processed signals, address data A0 is from the data bus line.
DBL and the address bus line ABL to the address driver 313, address control data C0 is applied to the address data control circuit 314 via the control bus line CBL,
Other control signals, a control signal and a cam signal CAM, are applied to the press controller via a data bus line DBL, a bidirectional data line buffer 318, an output latch driver 319, and the like. The address data control circuit 314 is
Control signals C1 to C4 are output based on address control data C0 of 310. That is, signal C1 is a control signal for address driver 313, signal C2 is a control signal for address decoder 315, signal C3 is a control signal for program memory 316 and data memory 317, and signal 4 is a control signal for interrupt control circuit 312. It is a control signal. The address driver 313 uses the control signal C1
Based on the address data A0 of the CPU 310, the address decoder 315 and the program memory 31
6 and data memory 317. The address decoder 315 receives the control signal C2.
It decodes the address data A0 applied from the address driver 313 based on and outputs address signals A1 to A6. That is, the signal A1 is the address signal of the output latch driver 319,
Signal A2 is an address signal for input buffer 320, signal A3 is an address signal for synchro pulse/speed conversion circuit 304, signal A4 is an address signal for synchro data input control circuit 303, and signal A5 is an address signal for data memory 317. The signal A6 is an address signal of the program memory 316. The program memory 316 is a memory that stores an operating program for the CPU 310, and reads out a predetermined program corresponding to the address data A0 based on the commands of the control signal C3 and address signal A6. The read program is applied to the CPU 310 via the data bus line DBL.
In other words, CPU 310 → address driver 31
The transmission operation of the loop consisting of 3→program memory 316→CPU 310 is performed until the program stored in the program memory 316 is completed, and this operation is further performed by transmitting address data A0 and address control data C0 output from CPU 310. It is controlled by address signal A6 and control signal C3 related to the address signal A6 and the control signal C3. The data memory 317 stores data regarding the entry angle, cutting angle, and advance angle of each cam related to desired press control, or other input data to the CPU 310 related to the calculation processing of the CPU 310.
This is a memory that stores output data from the CPU 310, and when a write command (based on control signal C3 and address signal A6) is applied from the CPU 310, each of the above data is stored in a predetermined storage table according to the address data A0 of the CPU 310. ,
Also, when a read command (based on control signal C3 and address signal A6) is added, address data A
0, predetermined data is read from a predetermined storage table. The read data is applied to the CPU 310 via the data bus line DBL. Here, a lead angle table will be described as an example of a storage table of this data memory 317. Now, assuming that the press operates at 0 to 80 spm, the advance angle table for each cam is 0 to 80 spm.
For example, set a range of 80 spm with a resolution of 0.5 spm. Further, the amount of advance angle is given with a resolution of 1 degree for an angle amount of 0 to 180 degrees (degrees). As a result, one lead angle data can be expressed as one byte (8 bits) of data. Therefore, data memory 3
If a certain address of 17, for example address 4000, is the lead angle data storage area for the advance angle speed of 0 spm of the first cam, then address 4160 will be the advance angle data storage area for the advance angle speed of 80 spm of the first cam because it is set with the resolution of 0.5 spm. This is the lead angle data storage area. Further, the advance angle data storage area for the advance angle speed of 0 spm of the second cam is set at address 4161, and data storage areas are allocated for the predetermined number of cams in the same manner as described above. Table 1 shows an example of this lead angle table.

【table】

【table】

Claims (1)

[Claims] 1. A procedure for storing in a first memory entry angle data corresponding to the entry angle of each cam and cutting angle data corresponding to the cutting angle of each cam, which are appropriately set and input through the data input means. , Pressing is performed based on the standard data for calculating the advance angle correction value of each cam, which is set and input as appropriate through the data input means, and the pseudo speed data corresponding to the press shaft rotation speed of the press machine, which is generated from the pseudo speed data generating means. A procedure for calculating advance angle correction data groups for each cam according to the shaft rotation speed and storing them in the second memory, and a procedure for calculating advance angle correction data groups for each cam according to the shaft rotation speed, and a procedure for calculating the advance angle correction data group for each cam according to the shaft rotation speed, and calculating this according to the actual press shaft rotation speed of the press machine detected by the speed detection means. The advance angle correction data for each applicable cam that matches the above is selected from the group of advance angle correction data for each cam stored in the second memory, and the actual press shaft rotation angle of the press machine detected by the angle detection means is determined. is corrected by the selected advance angle correction data, and the value of the corrected advance angle is determined individually for each cam determined by the entry angle data and cutting angle data stored in the first memory. A procedure for forming a cam signal indicating cam on or off for each applicable cam depending on the position in the angular range of , and controlling the operation of the press machine based on the formed cam signal. Press control method with procedures and. 2. A procedure for storing entry angle data corresponding to the entry angle of each cam and cutting angle data corresponding to the cutting angle of each cam, which are appropriately set and inputted through the data input means, in the first memory; Based on the reference data for calculating the advance angle correction value of each cam and the pseudo speed data corresponding to the press shaft rotation speed of the press machine generated from the pseudo speed data generating means, A procedure for calculating a group of advance angle correction data for each cam and storing them in a second memory, and adjusting the advance angle of each corresponding cam according to the pseudo speed data generated from the pseudo speed data generating means. The data is selected from a group of advance angle correction data for each cam stored in the second memory, and the value of the pseudo speed data corresponding to the press shaft rotation angle of the press machine generated by the pseudo angle data generating means is determined. The lead angle is corrected using the selected lead angle correction data, and the corrected lead angle value is
Indicates pseudo cam engagement or cam disengagement for each applicable cam, depending on the position in the angle range unique to each cam determined by the entry angle data and cutting angle data stored in the memory of A procedure for forming a cam signal, a procedure for adjusting the operation of the press machine based on the formed cam signal, and a procedure for adjusting the operation of the press machine based on the formed cam signal, and correspondingly adjusting the operation of the press machine according to the actual press shaft rotation speed of the press machine detected by the speed detection means. The advance angle correction data of the corresponding cam is selected from the advance angle correction data group for each cam stored in the second memory, and the value of the actual press shaft rotation angle of the press machine detected by the angle detection means is determined. The selected lead angle correction data is used to correct the lead angle, and the corrected lead angle value is determined by the angle range unique to each cam based on the entry angle data and cutting angle data stored in the first memory. a step of forming a cam signal indicating cam on or off for each corresponding cam depending on which position corresponds to the cam, and a step of controlling the operation of the press machine based on the formed cam signal; A press control method with 3 angle detection means for detecting the rotation angle of the press shaft of the press machine; speed detection means for detecting the rotation speed of the press shaft of the press machine; and pseudo speed data for generating pseudo speed data corresponding to the rotation speed of the press shaft of the press machine. a data input means for setting and inputting entry angle data corresponding to the entry angle of each cam, cutting angle data corresponding to the cutting angle of each cam, and reference data for calculating the advance angle correction value of each cam; a first memory in which the entry angle data and the cutting angle data entered in the settings are stored; press shaft rotation based on the reference data entered in the settings and the pseudo speed data generated from the pseudo speed data generating means; a calculation means for calculating a group of advance angle correction data for each cam according to the speed; a second memory in which the calculated group of advance angle correction data is stored; and a press shaft rotation speed detected by the speed detection means. Accordingly, advance angle correction data for each applicable cam corresponding to this is selected from a group of advance angle correction data for each cam stored in the second memory, and the press shaft rotation angle detected by the angle detection means is determined. is corrected by the selected advance angle correction data, and the value of the corrected advance angle is determined individually for each cam determined by the entry angle data and cutting angle data stored in the first memory. cam signal forming means for forming a cam signal indicating cam on or off for each corresponding cam depending on which position in the angular range corresponds to the cam signal; Press control device that controls the machine. 4. The angle detection means is a synchro oscillator,
The cam signal forming means converts a synchro signal output from the synchro oscillator into a digital signal, further monitors a change in the rotation angle of the synchro oscillator based on the digital signal, and monitors a change in the rotation angle of the synchro oscillator when the change in the rotation angle is a predetermined value. 4. The press control device according to claim 3, wherein the cam signal is generated every time the amount of . 5. The press control device according to claim 4, wherein the predetermined amount is 1° (degrees). 6. The speed detecting means converts the angle data output from the angle detecting means into a predetermined pulse signal, and outputs the speed data based on the converted pulse signal. Press control device. 7. The angle detection means is a synchro oscillator,
The predetermined pulse signal is a be-E signal that is output as one pulse every time the synchro oscillator rotates by the resolution related to the digital conversion when converting the output synchro signal of the synchro oscillator into a digital signal. A press control device according to claim 6. 8. The press control device according to claim 6, wherein the angle detection means is a pulse encoder, and the predetermined pulse signal is an output pulse signal of the pulse encoder. 9. The reference data for calculating the advance angle correction value set and inputted by the input means is three types of advance angle data indicating the optimum advance angle amount of each cam for three types of press shaft rotational speeds. , the calculation means performs interpolation calculation of the press shaft rotation speed and advance angle amount by approximating the advance angle amount correction characteristic curve for the press shaft rotation speed by three straight lines corresponding to the three types of press shaft rotation speed and advance angle data. 4. The press control device according to claim 3, wherein the advance angle correction data group is calculated by calculating the advance angle correction data group.