JP2614205B2 - Programmable controller for press machine - Google Patents

Description

[0001] The present invention relates to a control device for operating manufacturing devices which are connected to one another in a technical manner, more particularly to an individually driven automatic device, for example, The present invention relates to a control device applied to a press device having an automatic device for a work supply device and a work removal device. Such presses are operated individually or together with other presses on the production line.

[Conventional technology and problems]

First, a work is supplied to the press by the work supply device, a signal is generated when the work supply device returns to its starting position, the signal activates the stroke of the press, and a signal is generated after the end of the stroke of the press, This signal activates the work removal device of the press, a signal is generated when the work removal device returns to its starting position, and this signal controls the press device to operate the work supply device of the press. German Patent Application Publication No.
It is known from the publication 2209233. For such a series of closely interconnected processes, a press device with a well-known work supply device can be used in which the operation of the individually driven supply device is performed by a cam switch driven by the shaft of the press. (American Machinist; April 1971; see pages 57, 58). In that case, such a control system is manufactured due to the drawback that the unit devices inside the press device cannot cooperate in the shortest time, and mechanical control cams, electromechanical rotary cam switches, limit switches, etc. It has the disadvantage of requiring cumbersome switching in the case of technological changes and the disadvantage of insufficient reliability. It is known to operate a plurality of digital comparators, each with one switching output, in an individual programmable setting angle range (Balluf
f-Katalog; 799), in which case the comparison is made with the actual value of only the absolute digital angle transmitter. With this device, the control function can be performed in relation to the axial movement of the press device.
However, it has a disadvantage that it can be applied only to an expensive device to a press device including a plurality of unit devices that operate in an interconnected manner.

[Object of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a programmable control for a press machine having a series of individually driven cascaded units, with considerable avoidance of mechanical and electromechanical control elements. is there.

[Points and effects of the invention]

According to the invention, this object is achieved by an arrangement according to claim 1.

The programmable controller according to the present invention is configured such that the work supply device, the work take-out device, the machine tool inside the press device, and the like, each operate the unit device connected to the next stage as soon as possible. Can work together with high productivity.

The earliest possible time is determined by comparing the angular position from the angle detector of each of the unit devices connected upstream with the programmable set value stored in the set value transmitter. This set value depends on the mechanical dimensions and operating speed of the interconnected unit devices and the shape of the work. The pulses generated by the incremental angle detector are integrated in the counter. The integrated value is a signal that accurately represents the process of the unit device,
When the value matches the set value, the counter generates an output signal to operate the unit device connected to the next stage. That is, in selecting the set value, it must be ensured that the unit devices do not interfere with each other and cause breakage, and that the work can be reliably supplied to and removed from the press device. With this assurance, in the event of a change in manufacturing technology, for example, when changing workpieces or dies, the pressing device can be quickly and without problems, with a new working mode which is already set in a short time and adapted to the changed conditions. It can be switched by inputting the set value. If at least one unit device is unacceptably deviated in rotational speed, the rotational speed monitoring unit shuts down the machine quickly and normally stops another press device arranged in the production line, thereby Prevent damage due to operation failure. The operating device operatively couples the comparator output signal with auxiliary control or safety signals.
The counter holds the count corresponding to the actual position of the drive shaft of the device in the event of a power failure or current interruption. This is important to prevent damage to machines, workpieces and workers. Furthermore, the advantages of the control device according to the invention include the material and cost advantages of the configuration, the high reliability due to the considerable omission of mechanical and electromechanical control elements, and the It is that the reproduction of the operating time is accurate.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

The press consisting of a series of unit devices shown in FIG.
It comprises three unit devices, a work supply device 1, a crank press 2, and a work take-out device 3. The work supply device 1 has a controllable DC motor 111. The DC motor 111 is connected to a glove 116 via an electromagnetic clutch / brake device 113, a transmission 114 and a drive shaft 115. The crank press 2 on which the work is loaded by the work supply device 1 has a controllable DC motor 211. The DC motor 211 is connected to a crank drive of a ram 216 via a flywheel 212, a clutch / brake device 213, a transmission 214 and a drive shaft 215. Crank press 2
The work is taken out from the work by the work take-out device 3. The work take-out device 3 has a controllable DC motor 311. The DC motor 311 is connected to the glove 3 via an electromagnetic clutch / brake device 313, a transmission 314, and a drive shaft 315.
Connected to 16.

The incremental angle detector 218 is a drive shaft 215 of the crank press 2.
Driven directly by The angle detector 218 performs the entire press stroke at the rate of one pulse per degree, that is, the rotation 360
Convert ° to 360 unit pulses. In that case, the top dead center (for example, the starting position) corresponds to 0 °, and the bottom dead center corresponds to 180 °. Incremental angle detectors 118 to 318 fixed to auxiliary shafts 117 to 317 are indirectly connected to drive shafts 115 to 315 of the work supply device 1 to the work removal device 3 via transmissions 114 to 314. I have. These angle detectors 118, 318 convert the entire reciprocating stroke of grabs 116 to 316 into pulses at a rate of 1 pulse / 1 °, ie, 360 pulses / 360 °. In that case, the starting position of the grabs 116 to 316 is determined to be 0 °, and the stroke of the crank press 2 reaching the working chamber is determined to be 180 °. Each unit 1, 2, 3
Are provided with counters 13, 23 and 33, respectively. These counters 13, 23, 33 are pulse counters 131, 231, 331 (for example, three decimal counters and a digital comparator 132, 232, 332. The output signals of the angle detectors 118, 218, 318 are pulse counters 131,
It is sent to the clock pulse input T of 231 and 331, and its data output DA is connected to the first input of comparators 132, 232 and 332. Its second input is connected to the output of setpoint transmitters 120, 220, 320 formed as a three-digit preselector. Auxiliary shaft 117 of work supply device 1, drive shaft 215 of crank press 2 or work take-out device 3
Position switches 119, 219, and 319 configured as cam switches are attached to the auxiliary shaft 317. These position switches are of the mechanical, magnetic, optical or electronic type, and at the starting position of each unit 1, 2, 3 the return input R of their pulse counter 131, 231, 331.
To send a position signal.

The integrated value representing the stroke of the work supply device 1, the crank press 2, or the work take-out device 3 of the output pulse signals of the angle detectors 118, 218, 318 formed in the pulse counters 131, 231, 331 is transmitted to each set value. Vessels 120, 220, 32
When they match the set angle value set to 0, the comparators 132 and 23
Reference numerals 2 and 332 transmit operation signals to the operation devices 221 and 321 to 121 of the unit devices 2 and 3 to 1 at the next stage, respectively. The operating devices 121, 221 and 321 logically combine the operating signals with the additional control and safety signals of the units 1, 2, 3 and engage the clutch brakes 113, 213, 313 until returning to the starting position. The input is performed by this. That is, for example, the operation signal of the work supply device 1 generated by the comparator 332 is logically coupled to the system re-start signal and the safety signal in the operation device 121. The safety signal gives information as to whether or not the work finally processed is actually taken out of the work chamber of the crank press 2 by the work take-out device 3.

The corresponding minimum angle value for the operation of the units 1, 2, 3 is the set value to be given to the set value transmitters 120, 220, 320, as the grabs 116, 316 contact each other and they contact the ram 216. Decided not to. Prescribed dice /
When initially adjusting the press device for a combination of works, the corresponding set values for the shortest working time of the press device can be determined very simply, i.e. stepwise. If the press is replaced with a die / work combination already considered, the corresponding optimum set values can be immediately given to the set value transmitters 120, 220, 320, in which case the central position near the crank press 2 It is advantageous if a device is provided.

If up counters are used as pulse counters 131, 231, 331, they are returned to 000 by the position signal and their data outputs DA are set value transmitters 120, 220, 320.
Is compared with the direct setting of. If down counters are used, these are returned to 999 by the position signal, and the data output DA is compared with the complement set value (999-set value) for the largest count.

The rotational speeds of the controllable DC motors 111, 211, 311 are measured by tachometers 122, 222, 322. This measured value is led to a known electronic speed monitoring unit 4. If the rotational speeds deviate from each other to an unacceptable level for some reason, there is a danger that serious troubles and damages will occur in further operation, in which case the rotational speed monitoring unit 4
Sends a signal to all clutch / brake devices 113, 213, 313 of the three unit devices 1, 2, 3. This signal promptly disengages the clutch, applies the brake, and immediately stops the entire press device. Thereby, the unit devices 1, 2, 3
Is prevented from being damaged.

After removing the cause of the failure, the subsequent operation mode "Adjustment"
After the standard stop point of the machine and the device has been adjusted again, the press device is restarted. If the pressing device is connected to another pressing device in the production line, the quick stop of the failed pressing device is performed by the rotation speed monitoring unit 4, while the non-failing pressing device is normally stopped, and However, each press is returned to its starting position.

FIG. 2 shows a different embodiment of a programmable control unit (against a press unit consisting of three unit units, a work supply unit 1, a crank press 2 and a work take-out unit 3). In the case of this embodiment, the counters 13, 23, 33 are composed of three-digit decimal pulse counters 131, 231, 331 without losing the contents of the count, and the set value transmitter is a punch card as a set value input medium. It consists of a central setpoint transmitter 5 with 501. Unit devices 1, 2,
The output pulses of the three incremental angle detectors 118, 218, 318 enter the clock pulse input terminals T of the corresponding pulse counters 131, 231, 331, where they are integrated. Unit devices 1, 2,
In the starting position 3 the position switches 119, 219, 319 emit position signals to the loading control input L of the pulse counters 131, 231, 331, which are supplied from the central setpoint transmitter 5 via the data input DE. The loading is caused by the digital value corresponding to the set value. When the angular positions of the angle detectors 118, 218, 318 or the integrated values of the output pulses thereof match the corresponding set values, the unit 2 connected to the next stage via the overflow output terminals of the pulse counters 131, 231, 331 An operation signal is transmitted to the 3 to 1 operating devices 221, 321 to 121. The central set value transmitter 5 is a punch card
Evaluation unit for detecting the set value stored in 501, logic unit for converting the set value into a required form, first display unit 502 (LED display) for the set value, and data output of pulse counters 131, 231, 331 It has a second display unit 503 for the actual value obtained by the logic unit of the central setpoint transmitter 5 after coming from the terminal DA and being converted accordingly. The configuration and operation of the rotation speed monitoring unit 4 are the same as those of the first embodiment.

When up-counters are used as the pulse counters 131, 231, and 331, these are set by a position signal to a complement set value (1000-set value) for a numerical value that is one larger than the maximum count content, and an operation signal Is used as the overflow signal (from 999 to 000). When down counters are used, these are set to one less set value by the position signal, and the overflow signal is used as the operation signal (from 000 to 999).

[Brief description of the drawings]

FIG. 1 is a schematic system diagram showing an embodiment of a programmable controller based on the present invention for a press device, and FIG. 2 is a schematic system diagram showing a different embodiment of a programmable controller for a press device. 1. Work supply device 2. Crank press 3.
Work take-out device, 4 ... Revolution speed monitoring unit, 5 ...
Set value transmitter, 13,23,33 …… Counter, 111,211,311…
… DC motors, 115,215,315 …… Drive shafts, 118,218,318…
… Angle detector, 119,219,319 …… Position switch, 120,22
0,320: Set value transmitter, 131,231,331 ... Pulse counter, 132,232,332 ... Comparator, 501 ... Punch card, T
…… Clock pulse input end, DA …… Data output end, R…
... Return input terminal, L ... Load control input terminal.

Continued on the front page (72) Inventor Heinz, Porscheu, Germany 5080, Erfurt, Holbeinschjütersee, 63 (72) Inventor Deitrich, Richter Germany, Democratic Republic 5020, Erfurt, Sieutrath, del, Einheid, 36 (72) Inventor Gerhard, Schmidt, Democratic Republic of Germany 5024, Erfurt, Leipziger, Schutlase, 118 (56) References JP-A-57-50044 (JP, A) JP-A-53-120908 (JP, A) JP-A-58-20400 (JP, A) JP-A-57-195600 (JP, A) JP-A-57-52600 (JP, A) Japanese Utility Model Showa 56-6598 (JP, U)

Claims (2)

(57) [Claims] 1. A programmable control device for a press machine having a series of individually driven cascaded unit devices, the press operation being performed by a work supply device and the work take-out device being performed by a press. The operation of the work supply device is carried out by the work take-out device via an operating device attached to the corresponding unit device of the press device and, if necessary, the operating function is combined with an auxiliary control or safety signal. After returning to the starting position, the programmable control device for the press device, which stays at the starting position until the next operation and has a position switch for transmitting the starting position to each drive shaft of each unit, is attached. An incremental angle detector (118; 218; 318) is connected directly or indirectly to the drive shaft (115; 215; 315) of the unit (1; 2; 3). It is connected to the clock pulse input terminal (T) of the counter (13; 23; 33) which is not lost, and the position input terminal of the counter (13; 23; 33) is the position of the unit (1; 2; 3). Switches (119; 219; 319) and one digital set value transmitter (120; 220; 32) respectively.
0) is connected to the data input terminal of each counter (13; 23; 33), and the operation of the unit (2; 3; 1) in which the output terminal of the counter (13; 23; 33) is connected to the next stage. Device (221; 321; 121), and the drive motor (111; 21) of the unit device (1; 2; 3)
1; 311) is connected to an electronic rotational speed monitoring unit (4). 2. The programmable control device for a press according to claim 1, wherein the set value transmitter is arranged in the central set value transmitter (5).