JPH08132254A - Resistance welding controller - Google Patents

Abstract

PURPOSE: To prevent unwanted unenergized situation for welding by inputting a desired setting value for desired welding conditions with the absolute minimum key operations and also surely responding to starting signals from the outside. CONSTITUTION: A large number of keys and indicators arranged on the front panel 12 are divided into eight sections according to functions or setting contents: (1) section 14 for setting/indicating schedule Nos., (2) section 20 for indicating conditions, (3) section 34 for indicating welding sequence, (4) section 38 for setting/indicating cycles, (5) section 44 for setting/indicating welding current and indicating measurements, (6) section 52 for setting/indicating monitors, (7) section 62 for setting/indicating data counter, and (8) section 82 for inputting data. The section 62 for setting/indicating data counter is provided with a 'measurement indicator' key 78, and the section 82 for inputting data is provided with a '+1 data input' key 84 and a '-1 data input' key 86.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistance welding control device capable of coping with a large number of welding schedules.

[0002]

2. Description of the Related Art FIG. 14 shows a front panel of a conventional resistance welding control device of this kind. This front panel 2 as shown
A large number of keys and indicators are arranged at 00, and these are arranged by the welding schedule section 202, by the function or setting contents.
Cycle section 204, pressurizing N0. Section 206, dot monitor section 2
08, current section 210, monitor I section 212, step-up section 214, program section 216, operation section 218, monitor II section 220, and welding section 222.

In this resistance welding control device, the program key 224 is pressed to input various set values for each welding schedule. This program key 224
When the "mode input" key 226 is pressed by entering the program mode by the key operation of, the "condition input" display element 22 is displayed.
8 blinks and the welding schedule code can be set and input. Under such a state, the "+1 data input" key 230 or the "-1 data input" key 232 is operated,
Number that can set the welding schedule (for example, 1-1
From (5), for example, "13" is set (selected) as shown.

Next, when the corresponding key ("squeeze" key 234) is pressed to input a desired set value (for example, squeeze time TSQ), the corresponding display element ("squeeze display") adjacent to the upper side of the key is pressed. Since the element 236) blinks, the "+1 data input" key 230 or the "-1 data input" key 232 is operated to input the set value.
By repeating such an operation, all desired setting values are keyed in.

For other welding schedules, the same key input operation as above is performed, and then the operation key 23
Pressing 8 switches from program mode to operating mode.

In the operation mode, when a start signal is sent from the resistance welding machine or the like prior to the execution of the welding schedule, the welding schedule section 2 is displayed on the front panel 200.
The "condition input" display element 228 of 02 displays the welding schedule code (number) to be executed, the "squeeze" key 234 of the cycle section 204 displays the set value of the squeeze time TSQ, and the current section Each of the set values of the maximum current value, the current value I, and the current value II is selectively displayed on the first "current" display element 240 of 210, and so on. When resistance welding is started, the pressing and welding process is displayed on the "pressurizing N0." Display element 242 of the pressing N0. Section 206, the "weldable" display lamp 244 of the monitor II section 220, and the like. .

When the resistance welding is normally performed, a predetermined monitor value is displayed on the front panel 200, and the maximum current value, the current value I, and the current value are displayed on the first "current" display element 240 of the current section 210, for example. II measurement values are selectively displayed,
The “monitor I” display element 246 of the monitor I section 212 selectively displays the maximum conduction angle and the measured values of the + -side and −-side current fluctuation values. After that, the next schedule signal is waited in this state.

However, if an abnormal situation such as a non-energized situation occurs, the "non-energized" indicator lamp 248 of the monitor II section 220 lights up and the abnormal situation is displayed. In such a case, when the "reset" key 250 is pressed, the lamp 248 is turned off, the abnormal display is canceled, and the next start signal is waited for. Then, when the next activation signal is sent, the same operation as described above is repeated.

[0009]

As described above, in the conventional resistance welding control apparatus, the program key 224 is first pressed to switch to the program mode, and then the setting item selection key () corresponding to each desired welding condition is set. For example, press the "squeeze" key 234) and then press the "+1 data input" key 230 or the "-1 data input" key 232 until the set value of the selected setting item (welding condition) reaches the desired value, After finishing the setting operation of, press the operation key 238 to switch to the execution mode,
I was waiting for a start signal from the outside. In other words, at least four types of keys (program key 224, setting item selection key, data input keys 230 and 232, operation key 238) had to be pressed in order to input the welding conditions.

As described above, the conventional resistance welding control device requires many steps for setting and inputting the welding conditions, and thus the operation is troublesome for the worker in the welding workplace. Especially in the actual workplace, the problem is that the "+1 data input" key 230 or the "-1 data input" key 232 is used.
Even if you press to enter the desired setting value, at the end press the operation key 2
It is easy to forget the operation of pressing 38. In this case, even if the activation signal is sent from the main body of the resistance welding machine, the device does not operate and the welding current is not supplied. As a result, there has been a problem that the workpiece (workpiece) flows through the line without being resistance-welded to a predetermined place.

Further, in the conventional resistance welding control device, a predetermined measured value or monitor value is displayed on the front panel 200 immediately after one resistance welding is performed, and for example, the current portion 21.
On the first "current" display element 240 of 0, the maximum current value, the current value I, and the measured value of the current value II are selectively displayed. Any of these three types of monitor values (maximum current value, current value I, current value II is the first "current" display element 2
40 is displayed depending on which one of the corresponding selection keys “maximum current” key 250, “current I” key 252, and “current II” key 254 was selected before the start of the current resistance welding. Due to For example, "Current I" key 2
If 52 has been pressed, the LED lamp 252a on the left shoulder thereof is lit, and the first lamp after the resistance welding is completed.
The measured value of the current value I is displayed on the “current” display element 240.

However, if another key such as the "maximum current" key 250 is pressed in this state, the left shoulder L of the "maximum current" key 250 operated by this key is L.
At the same time that the ED lamp 250a lights up, the first "current"
The display content of the display element 240 is switched to the set value of the maximum current value, and the display content of all the other display elements is switched to the set value.

That is, in the conventional resistance welding control device, the display mode of the device is automatically switched to the measurement value display mode after the end of each resistance welding, but when any arbitrary key is pressed, the key operation is performed. In response to the change to the set value display mode, and once the set value display mode has been switched to, it is not possible to return to the measured value display mode until the next resistance welding is executed. Therefore, in the case of the above example, even if the operator desires to see the measured value of the current value I again after pressing the "maximum current" key 250, this cannot be done. Moreover, if not only the measured value of the current value I but also the maximum current value is to be monitored, resistance welding must be performed again under the same conditions, which takes time and effort.

Since this type of resistance welding control device can handle a large number of welding schedules with one unit, on the contrary, there is an opportunity for the operator to input various set values to the device, or from the device to the operator. There are many occasions to issue various abnormal alarms, simplicity is required on the operation side, and distinctiveness of individual display contents is required on the display side.

The present invention has been made in view of the above problems, and a first object thereof is to simplify the operation by inputting a desired set value for a desired welding condition with a minimum required number of key operations. Resistance welding control device, which improves resistance and prevents undesired welding de-energization by reliably performing resistance welding based on various set values at the time when a start signal is input from the outside. To provide.

A second object of the present invention is to provide a resistance welding control device in which various measured values obtained by resistance welding just before can be repeatedly or selectively viewed.

A third object of the present invention is to provide a resistance welding control device which, when an abnormal situation is detected in the apparatus, effectively displays the abnormal situation so that necessary measures can be taken quickly and surely. To provide.

A fourth object of the present invention is to enable setting of a plurality of modes for the counter value of the number of welding points.
Another object of the present invention is to provide a resistance welding control device which, when the counter value of the number of welding points reaches the set value of each mode, surely informs the workers in the vicinity of the set value.

[0019]

In order to achieve the first object, the first resistance welding control apparatus of the present invention sets various welding conditions and displays measured values for the predetermined welding conditions. In the resistance welding control device described above, each of the setting items corresponds to one or more setting items of the welding schedule or the welding condition and includes a large number of selection keys for enabling setting input for the setting items. Display means comprising selection means and a plurality of display elements each corresponding to any setting item or measurement item, and arranged in a predetermined positional relationship with the selection key corresponding to the setting item or measurement item And the first and second data input keys for incrementing and decrementing the set value of the set item which is set by the set item selecting means. Data input means, set value storage means for storing the set value of each setting item for each of the set welding schedules, and setting items for which setting input is enabled by the setting item selection means from the data input means Every time there is a key input, set value updating means for updating the set value in the storage means corresponding to the set item in response to the key input, and one of the welding schedules is specified from an external device. And a set value in the storage unit corresponding to the welding schedule specified by the start signal in response to the start signal input to the start signal input unit And a welding control means for executing a welding sequence based on the above.

In order to achieve the second object, the second resistance welding control device of the present invention is the first resistance welding control device according to the first resistance welding control device, in which a predetermined measurement item is welded during execution of the welding sequence. Welding condition measuring means for measuring conditions,
The measured value storage means for holding the measured value obtained by the welding condition measuring means in the immediately preceding welding sequence, and the display corresponding to the measured value obtained by the welding condition measuring means in the immediately preceding resistance welding. Measured value display control means for displaying on the element, and measured value display mode for displaying the measured value obtained by the welding condition measuring means on the display mode of the device immediately before the welding schedule on the corresponding display element. And a measurement value display mode selecting means for switching to.

In order to achieve the above-mentioned third object, the third resistance welding control device of the present invention is, in the above-mentioned first resistance welding control device, for displaying an alarm of a predetermined abnormal state in the device. An alarm display means is provided, and when the predetermined abnormal state is detected, only the alarm display means is turned on and at the same time all other display elements are turned off.

Further, in order to achieve the above-mentioned fourth object, the fourth resistance welding control device of the present invention, in the above-mentioned first resistance welding control device, sets a plurality of modes for the counter value of the number of welding points. The welding spot number counter setting means for performing the operation and the buzzer means for generating a different buzzer sound depending on the mode when the counter value of the welding spot number reaches the set value of each mode.

[0023]

In the first resistance welding control device, the set value of the welding condition is set for each of one or a plurality of welding schedules only by operating the selection key of the setting item selection means and the data input key of the data input means. Is entered. In this setting input operation, each time the data input key is operated, the set value data stored in the set value storage means is updated, and an activation signal from the outside can be accepted at any time (that is, in the execution mode). Enter) The standby state is taken. When the start signal is input, the set values of the welding conditions of the welding schedule designated by the start signal are read from the set value storage means, and the resistance welding control means executes the welding sequence according to the set values.

In the second resistance welding control device, the welding condition measured values of the predetermined measurement items obtained by the welding condition measuring means are accumulated in the measured value storage means and are controlled by the display control of the measured value display control means. It is displayed on the display element. When any of the setting item selection keys is pressed in this measurement value display mode, the mode is switched to the setting input mode and the setting value is displayed on the display element. However, the measured value data in the immediately preceding welding sequence is stored in the measured value storage means, and the measured value display mode selection means is operated to return to the measured value display mode again, and the measured values are again measured in each display element. The value is displayed.

In the third resistance welding control device, only the alarm display means is turned on while all the other display elements are turned off, so that an operator or the like can visually recognize or recognize an abnormal situation at a glance due to the contrast effect. You can

In the fourth resistance welding control device, when the counter value of the number of welding points reaches the set value of each mode, a buzzer sound peculiar to each mode is emitted, so that an operator or the like can hear or hear the meaning or contents of the counter alarm. Can be recognized.

[0027]

Embodiments of the present invention will be described below with reference to FIGS.

1 and 2 are a front view and a perspective view showing a panel structure of a front portion of a resistance welding control apparatus 10 according to an embodiment of the present invention. 3 to 6 are partially enlarged views showing respective parts of the front panel of this apparatus.

As shown, this resistance welding control device 10
Is a so-called vertical unit that is long in the vertical direction. A large number of keys and indicators arranged on the front panel 12 are divided into the following eight sections (1) to (8) according to functions or setting contents.

(1) Schedule N0. Setting / display unit 14

Schedule N at the top of front panel 12
0. A setting / display unit 14 is provided. Here, a "condition input" key 16 for enabling or selecting setting input of a welding schedule code (number), and a "condition" display element 18 for displaying a setting input or selected welding schedule code are provided. Are arranged.

(2) Status display section 20

A status display section 20 is provided below the schedule N 0. setting / display section 14. As shown in FIG. 3 (partially enlarged view), a plurality of display elements 22 to 32, which are LED lamps for displaying various states in the apparatus, are arranged here. For example, when the energization angle becomes larger than the set energization angle, the energization angle becomes abnormal and the "current attention" display element 30 is turned on.

(3) Welding sequence display section 34

A welding sequence display section 34 is provided below and adjacent to the status display section 20. Figure 4 (partially enlarged view)
36, a cycle / current waveform in one welding sequence is schematically illustrated in FIG. 36, and a plurality of display elements each including an LED lamp representing each part of the sequence are shown below the FIG. 36. SQ, W1, ... Are arranged along the time axis direction.

That is, from the left side, the squeeze time T
"Squeeze" display element SQ for displaying SQ, "weld I" display element W1 for displaying first weld time TW1, first
"Cool I" display element C1, which displays the cool time TC1,
"Up slope" to display up slope time TS1
Display element S1, "weld II" display element W2 displaying the second weld time TW2, "cool II" display element C2 displaying the second cool time TC2, "weld III" display element displaying the third weld time TW3 W3, "down slope" display element S2 for displaying down slope time TS2,
"Hold" display element HD that displays the hold time THD
And an "off" display element OF for displaying the off time TOF.

(4) Cycle setting / display section 38

A cycle setting / display section 38 is provided below and adjacent to the welding sequence display section 34. FIG.
As shown in the (enlarged view of part), here, a "cycle" key 40 for enabling or selecting the setting input of the number of cycles of each part (squeeze, weld I, cool I, ...) Of the welding sequence, and "Cycle" display element 42
Is arranged. The "cycle" display element 42 comprises, for example, a 2-digit 7-segment LED.

(5) Welding current setting display / measured value display section 4
Four

A welding current setting / measurement value / display section 44 is provided below and adjacent to the cycle setting / display section 38. As shown in Fig. 4 (partially enlarged view), this is the "current" that enables or selects the setting input of each welding current value in the three welding times (TW1, TW2, TW3) in the welding sequence. "Value" key 46 and "current value" display element 4
8 are arranged. These "current value" key 46 and "current value" display element 48 are also used to display the measured value of each weld time. "Current value" display element 48
Consists of, for example, a 3-digit 7-segment LED.

In FIG. 4, a cursor key 50 is arranged on the left side of the cycle setting / display section 38. Each time the cursor key 50 is pressed, the settable portions in the welding sequence are shifted to the right one by one, and the display elements SQ, W1, ... Of the settable portions are lit.

(6) Monitor setting / display section 52

The above welding current setting display / measured value display section 44
A monitor setting unit 52 is arranged below and adjacent to. Figure 5
As shown in the (partially enlarged view), the "energization angle" key 54 for enabling or selecting the setting and inputting of the energization angle monitoring value and the setting of the welding current monitoring value (upper limit value, lower limit value) are provided here. "+% Setting" to enable or select each input
A key 56, a "-% setting" key 58, and a "monitor value" display element 60 for displaying a monitor value (energization angle monitor value, welding current upper limit value or lower limit value) which has been set or input are arranged. Has been done. LED elements 54a, 58a, 60a that are turned on when the key is pressed are attached to the left shoulder of each key 54, 58, 60. The “monitor value” display element 60 is, for example, a 3-digit 7-segment L
It consists of an ED element.

(7) Data / counter setting / display unit 62

Below the monitor setting / display section 52,
A data counter setting / display unit 62 is provided.
As shown in FIG. 6 (partially enlarged view), here are seven modes described in the mode table 76: 0: “step-up count”, 1: “step-up rate”, 2: “total counter”, 3: “Dotting counter”, 4: “Production counter”, 5: “Transformer turns ratio”, 6: “± judgment entered /
A "select" key 64 for enabling or selecting a setting input for any one of "off", a "mode" display element 70 for displaying a code (number) of the set and input mode, A "data" display element 72 for displaying data for setting input or selection, and a cursor key 66 for specifying or selecting a digit of data for setting input.
And a "step NO." Key 68 for enabling or selecting the step-up NO. Setting input, and a "step NO." Display element 74 for displaying the set-up step-up NO. Value. Are arranged. The "mode" display element 70 and the "NO." Display element 74 are, for example, 1-digit 7-segment LED elements, and the "data" display element 72 is, for example, 4-digit 7-segment LED elements.

Here, the step-up means that the welding current is increased stepwise. That is, when resistance welding is repeated, the tip surfaces of the welding electrodes 144A and 144B gradually wear and expand, and the current density of the welding current supplied to the workpiece 146 decreases. The welding current is increased at a predetermined rate (step-up rate) every time the value of (1) is reached (step-up count number) to compensate for electrode wear.

The total counter is a preset value for the total number of dots. The hitting point counter is a preset value of the desired number of hitting points, and is normally set as the number of welding hitting points for one work (material to be welded) 146. Production counter
Usually, it is set as a preset value of the production quantity related to the welding of the works 146. When the number of hit points reaches each preset value of the total counter, the hit point counter, or the production counter, counter warning processing, which will be described later, is performed, and different buzzer sounds are generated.

A "measurement value display" key 78 for switching the display mode of the apparatus to a measurement value display mode is arranged below the "step No." key 68, as will be described later. When the "measurement value display" key 78 is switched to the measurement value display mode by pressing this key, or when it is switched to the measurement value display mode after one welding sequence is completed ( LED lamp 78 that lights up (while in the measured value display mode)
a is attached. Below the "measurement value display" key 78, a "count reset" key 80 for resetting the count values of the total counter, the dot counter, and the production counter is arranged.

(8) Data input section 82

At the bottom of the front panel 12 is provided a data input section 82 for keying in all data such as set values. As shown in FIGS. 1 and 2, here, a “+1 data input” key 84 for incrementing the value of each setting item enabled or selected by the above-mentioned setting section key by +1 and A "-1 data input" key 86 for decrementing by -1 is arranged. A power-on switch 88 is arranged on the left side of the data input section 82.

As shown in FIG. 2, the front panel 12 includes a rotatable dustproof cover 90 made of, for example, a transparent acrylic plate.
Due to this, it is protected from surrounding dust in a nearly sealed state.

In FIG. 1, the lower operation panel 92 provided below the front panel 12 is protruded from the dustproof cover 90 and is always exposed. On the lower operation panel 92, keys often used during welding work, for example, a "reset" key 93, a "count" key 94, a "pressurize" key 95 and a "weld on / off" key 96 are arranged. Has been done. On the left shoulder of the latter three keys 94, 95, 96, an LED lamp 94a, which lights up when a key is operated,
95a and 96a are attached, respectively.

FIG. 7 shows the system configuration of the resistance welding control device 10 of the present invention. The internal bus 100 includes a CPU (central processing unit) 102, a RAM (random write / read memory) 104, a ROM (read only memory) 106, a reference counter 108, a panel controller 110, an input / output interface circuit (I / O). ) 112, A / D converter 114
Is connected.

The CPU 102 controls the operation of each component and the entire apparatus according to the control program, the display program, the key input routine, etc. stored in the ROM 106, and calculates the welding current measurement value and the set value and the measurement value. Various calculations such as the comparison judgment of are executed.

The RAM 104 temporarily stores data such as various calculation results and measured values obtained by the CPU 102, and schedule codes and set values set and input by the keys (panel keys) on the front panel for each welding schedule. And are associated with each other and stored in a predetermined memory address.

The panel controller 110 includes the CPU 10
It has a buffer memory for storing the set value data or the measured value data sent from the device 2, and distributes and displays the data on the corresponding panel display elements.

The reference counter 108 generates a reference clock. The I / O 112 transfers the control signal sent from the CPU 102 to the thyristor firing circuit 116, and also receives a start signal from the resistance welding machine to CP this.
It operates to send to U102. Further, for example, a buzzer 113 is attached to the back surface of the device, and the buzzer 113 is connected to the CPU 102 via the I / O 112. The A / D converter 114 includes the waveform restoration circuit 1
An analog welding measurement signal is input from 18 or the waveform amplification circuit 120, and the input analog signal is converted into a digital signal and sent to the CPU 102.

The pressurizing output selecting section 122 follows the code of the pressurizing pressure No. sent from the CPU 102 and supplies the AC power supply voltage (for example, 1 to the pressurizing valve corresponding to the code).
00V) is supplied. The control power supply unit 124 inputs the AC power supply voltage via the control power supply transformer 126 and supplies a predetermined operating power supply voltage to each unit in the apparatus. Phase detection circuit 1
28 inputs the secondary side voltage of the synchronizing transformer 130 to which the commercial power source voltage E for welding is input to the primary side, and supplies a synchronizing signal or a timing signal synchronized with the commercial frequency to each part in the system. The power supply voltage detection unit 132 detects a variation in the welding power supply voltage E via the synchronization transformer 130, and supplies a compensation voltage for compensating for the variation to the A / D converter 114.

Incidentally, 134A and 134B are a pair of thyristors constituting a contactor, 136 is a welding transformer, and 1 is a welding transformer.
38 is a current transformer for measuring the primary side welding current, 14
0 is a toroidal coil for measuring secondary side welding current, 142
Is a primary side feedback / secondary side feedback switching circuit, 144A and 144B are welding electrodes, and 146 is a material to be welded.

Next, referring to the flow charts of FIGS. 8 to 11, the operation of the resistance welding control apparatus of this embodiment, particularly the CPU
The processing operation of 102 will be described.

FIG. 8 shows the processing operation in the setting input mode. When any of the setting item selection keys on the front panel 12 is pressed, the apparatus switches to the setting input mode. When the mode is switched to the setting input mode, the set value of each setting item currently stored (registered) in the memory (RAM 104) is displayed on the display element of each setting item (step [1]).

In this case, for a display element corresponding to one or more setting items, the setting item selected at that time, that is, the setting of the corresponding display element or the setting item for which the display lamp is lit is set. The value is displayed. For example, when the "weld I" display element W1 is lit in the welding current setting / measurement value display section 44, the "current value" display element 4 is displayed.
At 8, the set value of the welding current value for the first weld time TW1 is displayed. When the LED lamp 56a on the left shoulder of the "+% setting" key 56 in the monitor setting / display unit 52 is lit, the "monitor" display element 60 displays the set value of the welding current upper limit value.

In the normal setting input operation, the "condition input" key 1 is used to set (select) the welding schedule first.
6 is pressed. When this key 16 is pressed, the "condition" display element 18 blinks, and the welding schedule code becomes ready for setting input. When the "+1 data input" key 84 or the "-1 data input" key 86 is pressed in such a state, the code of the welding schedule is incremented or decremented each time (steps [4], [5]).

After the welding schedule code is fixed, the same operation as described above is repeated for each setting item to input or change the setting values of all the welding conditions for each welding schedule (step [1 ],
[2], [4], [5], [7]). Each time the selected setting item selection key is pressed again, the key 8
The digit of the set value which is the target of key input (increment or decrement) by 4,86 is shifted by one.

When a start signal is sent from the outside (main body of the resistance welding machine) after the setting input operation is completed, the operation mode is entered from that point (step [6]).

When the "measured value display" key 78 is pressed between setting inputs (step ([3])), the mode switches to the measured value display mode described later.

FIG. 9 shows the processing operation in the operation mode. In operation mode, first decode the received activation signal,
The welding schedule designated by the start signal is read (step [8]). Then, the schedule code and set values for the welding schedule are stored in the RAM 10
4 are read out and displayed on the corresponding display elements (step [9]).

After the setting values are displayed on the front panel 12 as described above, the resistance welding (welding sequence) is executed according to the welding schedule designated by the start signal (step [10]). In this resistance welding, CPU
A control unit 102 controls each welding condition to match the set value. For example, regarding the welding current, the power supply voltage fluctuation compensation control based on the voltage detection signal from the power supply voltage detection unit 132, the current transformer 138, and the waveform amplification circuit 14 are performed.
The primary feedback constant current control based on the primary current detection signal from 2 or the secondary feedback constant current control based on the secondary current detection signal from the toroidal coil 140 and the waveform restoration circuit 118 is performed.

When resistance welding is started, each display element on the front panel 12 is once turned off. However, in the welding sequence display unit 34, the display elements SQ, W1, ... Sequentially scan and light according to the progress of the sequence, and the progress status is displayed. In addition, the CPU 102 calculates each measurement value based on the welding measurement signal from each part regarding the welding condition of each measurement item.

When the welding sequence is completed as described above, the CPU 102 determines the welding result for the current resistance welding based on the measured value, the sensor output signal from each part, etc. (step [11]). Then, when a normal determination is made, the mode is switched to the measurement value display mode, and when an abnormal determination is made, an abnormality alarm processing routine (step ([15])) described later is executed.

In the measured value display mode, each measured value obtained this time, that is, immediately before the resistance welding is stored in the memory (RAM 104).
Read out from each of the display devices and displayed on each corresponding display element (step [12]). Even in this case, the measured values of the measurement item selected at that time are displayed on the display element that corresponds to one or more measurement value items. For example, as described above, the welding current setting display / measurement value display unit 44
When the "weld I" display element W1 is lit,
The "current value" display element 48 displays the measured welding current value at the first weld time TW1.

Here, if the operator desires to see another current measurement value, for example, a welding current measurement value of the second weld time TW2, the "current" key 46 is pressed, and then the cursor key 50 is pressed. Weld II "display element W2 is turned on. Then, the mode is temporarily switched to the set value input mode (steps [14] and [1]), but if the "measured value display" key 78 is then pressed, the mode returns to the measured value display mode (step [3]), and the "current value" is displayed. The measured value of the welding current during the second weld time TW2 is displayed on the display element 48 (step [12]).

The number of welding points is 1 for each resistance welding.
Since the count value increases, the count value of the total counter, the dot counter, and the production counter is incremented by one. When any of these count values reaches a set value (preset value), a counter warning processing routine (step [16]) described below is executed.

FIG. 10 shows a counter warning processing routine. First, it is judged or recognized which of the total counter, the dot counter, and the production counter has reached the preset value (step [17]).

When the total counter reaches the preset value, the buzzer on the back side of the apparatus sounds continuously (for example, a beep), and at the same time, the "data" display element of the data / counter setting / display unit 62 of the front panel 12 is displayed. The preset value of the total counter is blinked and displayed at 72 (step [18]). Although not shown in FIG. 10, I /
An abnormal output signal is output to the outside via O112. When the "count reset" key 80 on the front panel 12 is pressed, the total counter is reset (step [1
9], [20]), this routine ends.

When the hit point counter reaches the preset value, the buzzer sounds for one second (for example, a bit) (step [21]), and the hit point counter is automatically reset (step [22]).

When the production counter reaches the preset value, the buzzer intermittently (for example, beep bee ...).
At the same time, the preset value of the production counter is blinked and displayed on the "data" display element 72 of the data / counter setting / display section 62 of the front panel 12 (step [2
3]). Also in this case, when the abnormal output signal is output to the outside through the I / O 112 and the "count reset" key 80 on the front panel 12 is pressed, the production counter is reset (steps [24], [25]). ), This routine ends.

FIG. 11 shows an abnormality warning processing routine.
The contents of the abnormality in the device include, for example, “current setting abnormality” in which the welding current value exceeds the monitoring value, thyristors 134A, 1
There are "thyristor short circuit abnormality" in which 34B short-circuits, "energization angle abnormality" in which the conduction angle exceeds the set value, and the like, and a code (abnormality code) is assigned to each abnormality content.

In this abnormality alarm processing routine, an abnormality signal is output to the outside (step [26]), and
As shown in FIG. 2, the "data" display element 72 of the data / counter setting / display section 62 blinks the code of the abnormality content. Further, the "abnormal" display element 24 or the "current attention" display element 30 of the status display section 20 is also turned on. On the other hand, all other display elements are turned off (step [2
6]). As a result, the workers near the front panel 12
An abnormal situation and the contents of the abnormality can be surely recognized by simply glancing at, and appropriate action can be taken immediately. The “reset” key 93 on the lower operation panel 92
When is pressed, the above-mentioned abnormality display ends, and this routine ends (steps [28] and [29]).

In the example of FIG. 9, the abnormal alarm processing routine is set after the welding sequence is completed. However, when an abnormal situation occurs in the apparatus, an abnormal alarm is issued by interruption at any time (for example, during setting input). A processing routine may be performed. In addition, after the abnormal alarm processing routine or the counter alarm processing routine ends, the setting input mode may be automatically switched (even if any setting item selection key is not pressed).

As described above, in the resistance welding control apparatus according to the present embodiment, any one (usually a target of setting input) is set.
When the setting item selection key is pressed, it switches to the setting input mode (program mode) in response to the key operation,
"+ Data input" key 84, "-Data input" key 86
The setting value (registration data) of each setting item is updated every time the key is input, and the operation mode is set in response to a start signal from the outside at any time.

As described above, since the desired setting input can be performed only by operating the two kinds of keys, the setting item selection key and the data input key, the minimum number of keys on the operation (front) panel 12 is required. The input operation procedure is also very simple. Therefore, it is possible to significantly reduce the burden on the operator in the welding workshop. Moreover, as described above, the welding sequence can be executed at any time (even if the special mode selection key for switching to the operation mode such as the conventional operation key 238 is not pressed) in response to the activation signal from the outside. It is possible to prevent non-execution of welding, de-energization, etc., and avoid producing defective welding products.

Further, in the resistance welding control device of this embodiment,
By simply pressing the “measured value display” key 78, any of the measured values of the immediately preceding resistance welding measurement item can be changed over and over again, even if the measurement values of other measurement items are once changed, or the setting input mode is changed. However, it can be seen on the front panel 12. Therefore, all the measurement items can be monitored with one resistance welding.

Further, in the resistance welding control device of this embodiment,
When an abnormality occurs in the device, all other display elements are turned off, and the display elements related to the abnormality alarm (24, 30, 72)
Since only one lights up, the operator can visually recognize or recognize the abnormal situation at a glance due to the contrast effect.

Further, in the resistance welding control device of this embodiment,
It is possible to monitor the number of welding spots in three modes: total counter, spot counter, and production counter. When the preset value is reached in each mode, the required alarm is displayed on the front panel 12. Instead, the buzzer 113 emits a different buzzer sound for each mode.
You can hear the meaning or contents of the counter alarm by hearing without looking.

Although the resistance welding control device of the above-described embodiment is a vertical type unit, as shown in FIG. 13, the present invention is also applicable to a horizontal resistance welding control device. In the resistance welding control device of FIG. 13, a welding sequence display portion 34 'and a cycle setting / display are provided on the upper half of the front panel 12'.
A display unit 38 'is provided, and the corresponding display elements Di and the setting item selection keys Ki are arranged vertically adjacent to each other. Welding current setting display on the lower half of the front panel 12 '.
A measurement value display unit 44 'and a monitor setting / display unit 52' are provided. In these sections 44 'and 52', one display element Dj corresponds to a plurality (for example, three) of setting item selection keys Kj. The vertical lower operation panel 92 has been changed to a horizontal right operation panel 92 '.

This horizontal resistance welding control device has the same keys, display elements, circuit configuration and software as those of the vertical resistance welding control device, and functions similarly. Therefore, the same effect as the above can be obtained.

[0088]

As described above, according to the first resistance welding control apparatus of the present invention, the minimum necessary keys only using the selection key of the setting item selection means and the data input key of the data input means. It is possible to input desired set values for desired welding conditions by operation, which simplifies the setting input operation, and can reliably perform resistance welding with respect to a start signal from the outside. It is possible to prevent de-energization.

Further, according to the second resistance welding control device of the present invention, various measured values obtained by the immediately preceding resistance welding are stored in the measured value storage means and the measured value display mode selection means is operated. Accordingly, the various measured values are displayed all or selectively on the display means any number of times, so that the desired measured value can be viewed any number of times by one resistance welding.

Further, according to the third resistance welding control apparatus of the present invention, when an abnormal situation is detected in the apparatus, only the abnormality alarm display element is turned on while the other display elements are turned off. Therefore, the contrast effect allows an operator or the like to recognize an abnormal situation or the contents at a glance, and an appropriate measure can be promptly and surely taken.

Further, according to the fourth resistance welding control apparatus of the present invention, the counter value of the number of welding points can be set in a plurality of modes, and when the counter value reaches the set value of each mode, each mode is set. Since a buzzer sound peculiar to is output, an operator or the like can visually recognize the meaning or content of the counter alarm.

[Brief description of drawings]

FIG. 1 is a front view showing a panel configuration of a front portion of a vertical resistance welding control apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a panel configuration of a front portion of the resistance welding control apparatus of the embodiment.

FIG. 3 is a partially enlarged view showing the configuration of a status display section 20 in the front panel 12 of the resistance welding control apparatus of the embodiment.

FIG. 4 is a partially enlarged view showing the configurations of a welding sequence display section 34, a cycle setting / display section 38, and a welding current setting display / measured value display section 44 in the front panel 12 of the resistance welding control apparatus of the embodiment.

FIG. 5 is a partially enlarged view showing the configuration of a monitor setting / display unit 52 in the front panel 12 of the resistance welding control apparatus of the embodiment.

FIG. 6 is a partially enlarged view showing the configuration of a data counter setting / display unit 62 in the front panel 12 of the resistance welding control apparatus of the embodiment.

FIG. 7 is a block diagram showing a system configuration of the resistance welding control apparatus of the embodiment.

FIG. 8 is a flowchart showing a CPU processing operation in a setting input mode in the resistance welding control apparatus of the embodiment.

FIG. 9 is a flowchart showing a CPU processing operation in an operation mode and a measurement value display mode in the resistance welding control apparatus of the embodiment.

FIG. 10 is a flowchart showing a counter warning processing routine in the resistance welding control apparatus of the embodiment.

FIG. 11 is a flowchart showing an abnormality warning processing routine in the resistance welding control apparatus of the embodiment.

FIG. 12 is a partially enlarged view showing a display element for displaying an abnormality content in the resistance welding control device of the embodiment.

FIG. 13 is a perspective view showing a panel configuration of a front portion of a horizontal resistance welding control apparatus according to another embodiment.

FIG. 14 is a front view showing a panel configuration of a front portion of a conventional resistance welding control device.

[Explanation of symbols]

 10 Resistance Welding Controller 12 Front Panel 14 Schedule No. Setting / Display 20 Status Display 34 Welding Sequence Display 38 Cycle Setting / Display 40 “Cycle” Key 42 “Cycle” Display Element 44 Welding Current Setting Display / Measured Value Display unit 46 "Current value" key 48 "Current value" display element 52 Monitor setting / display unit 62 Data counter setting / display unit 78 "Measured value display" key 82 Data input unit 84 "+1 data input" key 86 "- 1 data input ”key 102 CPU 104 RAM 106 ROM 112 I / O 113 buzzer

Claims (5)

[Claims] 1. A resistance welding control device in which various welding conditions are set and measured values are displayed for predetermined welding conditions, each of which is set to one or a plurality of setting items of a welding schedule or welding conditions. Corresponding and setting item selection means consisting of a large number of selection keys for enabling setting input for that setting item, each corresponding to any setting item or measurement item, and to that setting item or measurement item Display means including a large number of display elements arranged in a predetermined positional relationship with respect to the corresponding selection key, and incrementing or decrementing the set value for each setting item for which setting input is enabled by the setting item selecting means. Data input means including first and second data input keys, and set values for each set item for each set welding schedule. Setting value storage means for storing, and each time there is a key input from the key input means for a setting item for which setting input is made possible by the setting item selecting means, the setting value in the storage means corresponding to the setting item. A set value updating means for updating a set value according to the key input, a start signal input means for inputting a start signal for designating one of the welding schedules from an external device, and a start signal input means for inputting the start signal. And a welding control means for executing a welding sequence based on the set value in the storage means corresponding to the welding schedule designated by the starting signal. Resistance welding control device. 2. A welding condition measuring means for measuring a welding condition of a predetermined measurement item when the welding sequence is executed, and a measurement value obtained by the welding condition measuring means in the immediately preceding welding sequence. Measurement value storage means, measurement value display control means for displaying the measurement values obtained from the welding condition measurement means in the immediately preceding welding sequence on the corresponding display elements, and the display mode of the device Measurement value display mode selecting means for switching the measurement values obtained by the welding condition measuring means in the welding sequence to measurement value display modes for displaying the corresponding measurement values on the corresponding display elements. The resistance welding control device according to claim 1. 3. At least one of the display elements is set to selectively display one of a plurality of measured values of the welding condition corresponding to two or more types of the measurement items, and the measurement is performed. The value display control means, during the measurement value display mode, each time any one of the plurality of selection keys corresponding to the plurality of welding conditions is key operated, the key operated selection is performed. The resistance welding control device according to claim 2, wherein the measured value of the welding condition corresponding to the key is read from the measured value storage means and displayed on the display element. 4. An alarm display means for displaying an alarm of a predetermined abnormal condition in the apparatus is provided, and when the predetermined abnormal condition is detected, only the alarm display device is turned on and at the same time all other alarms are displayed. The resistance welding control device according to claim 1, wherein the display element is turned off. 5. A welding dot number counter setting means for setting the counter value of the welding dot number in a plurality of modes, and depending on the mode when the counter value of the welding dot number reaches the set value of each mode. And buzzer means for generating different buzzer sounds.
The resistance welding control device described in.