JPH0116240B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a press control device for a press machine controlled by an electronic rotary cam switch. 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 a press, the tachometer generator installed in this DC motor can be used as a speed detector for the press. In recent years, so-called automatic advance angle control, in which the voltage corresponding to the rotational speed of the DC motor outputted from the tachometer generator is converted into a coasting angle to control the advance angle of the rotary cam switch, has been commonly practiced in recent years. . However, in many of the control devices related to such conventional press control methods, (a) the setting of the turning angle and cutting angle of the rotary cam switch is all done by a digital switch installed in the setting device of the control device; In order to
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) 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. (d) The output voltage of the tachometer generator is necessary to set the automatic advance angle of the rotary cam switch, and the main motor must be kept running even when the press itself is not in operation.
Therefore, it is dangerous and also leads to waste of electricity. Further, the motor speed must be changed in response to the automatic advance angle of the rotary cam switch being set, which is cumbersome to operate. (e) 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. It is an object of the present invention to provide a press control device that eliminates the various drawbacks mentioned above, greatly reduces the time required for press operation settings and adjustments, and enables safe and highly accurate press operation. . 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) 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 device 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 tachometer generator TG disposed on the main motor shaft of the press, a first synchro oscillator 100 disposed on the press shaft (a shaft to which press motion is mechanically transmitted from the crankshaft),
A second synchro oscillator 200 that shares an output line with the first synchro oscillator 100 via an appropriate means such as a connector and is arranged at a free position; the first synchro oscillator 100 and the second synchro oscillator 200 A relay RY that switches and controls the angle data AD1 and AD2 output from the relay RY, and a control unit that receives the angle data AD1 or AD2 that has been switched by the relay RY and has become valid data and the output voltage of the tachometer generator TG. 300, and an operation panel unit 400 for inputting various data to the control unit 300.
It is equipped with a rotary cam switch consisting of
The output voltage of the tachometer generator TG, various data input from the operation panel unit 400,
and angle data AD1 applied from the first synchro oscillator 100 or the second synchro oscillator 20
The control unit 300 performs a calculation based on the angle data AD2 added from 0, and a calculation signal resulting from the calculation is applied as a cam signal CAM to a press controller (not shown). 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. Further, a control signal CON indicating the control mode etc. is output from the control unit 300, and this signal CON is also applied to the press controller. Note that the second synchro oscillator 200 is a synchro oscillator for adjustment, and in the embodiment shown in FIG. 1, the angle data AD2 is supplied directly from the press side to the control unit 300, but other As a means for this, a suitable connector may be provided in the operation panel unit 400, and the angle data AD2 may be supplied to the control unit 300 via the operation panel unit 400. Further, the press controller is a well-known control device that directly controls various operations of the press based on the control signal CON and cam signal CAM sent from the control unit 300 of the rotary cam switch. A press operation signal PC, which is a press operation confirmation signal, is sent to the press operation signal PC. The operation panel unit 400 also includes a speed setting volume 401 for setting a predetermined voltage used when setting the automatic advance angle, a keyboard 403 for switching control modes and setting various data, and a display 405. It is equipped with a set value from the keyboard 403, each value of the rotary cam switch such as the entrance angle, cutting angle and advance angle processed by the control unit 300, and various pilots related to this press control. It is 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 by lamps or digitally on the display section. These specific operation examples and display examples will be described later. 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, control signal CON and cam signal CAM, are applied to the press controller via data bus line DBL, bidirectional data line buffer 318, 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.
Based on this, address data A0 applied from address driver 313 is decoded and address signals A1 to A7 are output. 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 data latch 342, signal A4 is an address signal for A/D converter (analog/digital converter) 341, and signal A5 is an address signal for synchro data input. The signal A6 is an address signal for the control circuit 303, the signal A6 is an address signal for the data memory 317, and the signal A7 is an address signal for 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 A7. 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 A7 and control signal C3 related to. 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 1 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. Furthermore, 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】

Claims (1)

[Scope of Claims] 1. A first angle detection means for detecting a rotation angle of a press shaft of a press machine, a second angle detection means for generating pseudo speed data corresponding to a rotation speed of a press shaft of a press machine, and a press. A speed detection means for detecting the rotation speed of the press shaft of the machine; a pseudo speed data generation means for generating pseudo speed data corresponding to the rotation speed of the press shaft of the press machine; and entry angle data corresponding to the entry angle of each cam and each data input means for setting and inputting cutting angle data corresponding to the cutting angle of the cam and reference data for calculating advance angle correction values for each cam; a first memory, and a calculation means for calculating a group of advance angle correction data for each cam according to the press shaft rotational speed based on the input reference data and the pseudo speed data generated from the pseudo speed data generating means. a second memory in which the calculated advance angle correction data group is stored; and a second memory in which the calculated advance angle correction data group is stored; The lead angle correction data is selected from a group of lead angle correction data for each cam stored in a second memory, and the value of the pseudo angle data generated from the second angle detection means is corrected by the selected lead angle correction data. At the same time, depending on what position this corrected advance angle value corresponds to in the angular range unique to each cam determined by the entry angle data and cutting angle data stored in the first memory, a first cam signal forming means for forming a pseudo cam signal indicating pseudo cam-on or cam-off for each applicable cam, and each corresponding corresponding one according to the press shaft rotational speed detected by the speed detection means; Selecting cam advance angle correction data from a group of advance angle correction data for each cam stored in the second memory, and selecting the value of the press shaft rotation angle detected by the first angle detection means. The corrected advance angle value is corrected using the advance angle correction data obtained by a second cam signal forming means for forming a cam signal indicating cam on or off for each corresponding cam depending on whether the cam corresponds to the position; A press control device that adjusts a press machine based on a pseudo cam signal and operates the press machine based on a cam signal formed by the second cam signal forming means. 2. The output of the first angle detection means and the output of the second angle detection means are automatically selected by the first and second cam signal forming means during the adjustment and during the operation, respectively. A press control device according to claim 1. 3. The press according to claim 2, wherein the second angle detection means is detachably connected to the first and second cam signal forming means via appropriate lead wires and connectors. Control device. 4. The first and second angle detection means are synchro oscillators, and the first and second cam signal forming means convert the synchro signals output from the synchro oscillators into digital signals, and further convert the synchro signals output from the synchro oscillators into digital signals. A change in the rotation angle of the synchro oscillator is monitored based on a signal, and the cam signal is generated every time the change in the rotation angle reaches a predetermined amount. The press control device according to item 3. 5. The press control device according to claim 4, wherein the predetermined amount is 1° (degrees). 6. 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. The press control device according to claim 1, wherein the advance angle correction data group is calculated by calculating the advance angle correction data group.