JPH0257471B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a resistance welding control device that can handle a large number of welding condition schedules with 11 units, and in particular, a resistance welding control device that can easily and quickly set, change, and confirm welding conditions, and interpret measured values. It was devised. (Prior Art) Generally, a device for controlling resistance welding is equipped with a panel for setting welding conditions, displaying measured values such as welding current and energization time, and displaying predetermined alarms. FIG. 6 shows the front panel of a conventional resistance welding control device. Initial pressurization time (SQUEEZ), first energization time (WELD1), cooling time (COOL), second energization time (WELD2), holding time (HOLD), first energization current (CURR1), second energization current (CURR2), etc. Welding conditions are set and displayed using digital switches or thumb wheel switches 200A to 200D, and welding results and alarms are displayed on lamps 202 to 208.
It is now lit up and displayed. 210
-216 are current range changeover switches, reset switches, etc. This front panel allows two
Welding condition schedule (SOL A), (SOL
Settings can be displayed for B). FIG. 7 shows the front panel of another resistance welding control device. This is a key input type, and welding conditions and data are set and input from a numeric keypad type keyboard 300 and displayed on a seven segment type display 302.
Each setting condition such as the initial pressurization time and the first energization time is displayed as an address. For example, the address shown in the figure is "31",
DATA "030" indicates that the set value of the first energization time is 30 cycles. Such address display is defined in an address table as shown in FIG. 8, and is used for comparison when numerically inputting setting conditions and understanding the display contents. (Problems to be Solved by the Invention) However, the two types of resistance welding control devices described above each have the following inconveniences. First, since the resistance welding control device shown in FIG. 6 uses a digital switch, the number of welding condition schedules that can be set at one time is limited to two at most as shown in the figure. Therefore, in cases such as resistance welding using a welding robot, a series of welding condition schedules with different welding conditions are set up in advance, and these schedules are continuous at short time intervals (time intervals where there is no time to operate a digital switch). When this process is carried out on a regular basis, a single resistance welding control device cannot handle the problem and many devices are required, which poses problems in terms of cost and space. Furthermore, digital switches are prone to wear and play due to repeated use, making it difficult to adjust them to the set value and making setting operations cumbersome. Furthermore, since the input mechanism has a digital switch (thumb wheel switch) for each digit of each setting value, the number of digital switches increases as the type, number, and number of digits of setting items increase. This resulted in an increase in the number of processes, complexity, and high costs. In addition, in the resistance welding control device shown in Fig. 7, each welding condition is displayed as an address, which is difficult to read at a glance, and it is troublesome to refer to the address table (Fig. 8). Even people who are used to displaying addresses often misunderstand them. The present invention has been made in view of the above-mentioned problems of the prior art, and is capable of supporting a large number of welding condition schedules with a single machine, and also allows setting, changing, and checking of welding conditions, as well as interpretation of measured values, etc., to be performed easily and quickly. It is an object of the present invention to provide a resistance welding control device that can perform resistance welding. (Means for Solving the Problems) In order to achieve the above object, the resistance welding control device of the present invention each corresponds to one setting item of a welding schedule or welding conditions, and a setting item selection means consisting of a large number of selection keys for enabling setting input;
Setting input is enabled by a display means consisting of a large number of display elements, each corresponding to a setting item or measurement item, and arranged close to a selection key corresponding to that setting item, and a setting item selection means. key input means consisting of first and second data input keys for respectively incrementing and decrementing the set values for the set welding schedules; a schedule signal input means for inputting a schedule signal given from an external device prior to execution of the selected welding schedule; and a schedule signal input means for inputting a schedule signal given from an external device prior to execution of the selected welding schedule; A measuring means that measures conditions and obtains the measured values, displays the setting values of setting items on the corresponding display elements in the program mode, and stores the setting values for the welding schedule in response to the schedule signal in the operation mode. The measuring device is configured to include display control means for reading out the values from the measuring means and displaying them on the respective corresponding display elements, and displaying the measured values given by the measuring means on the respective corresponding display elements. (Function) In the program mode, when the selection key corresponding to the welding schedule is pressed, the schedule code becomes available for setting input. Under this condition, when the first data input key or the second data input key is pressed, the schedule code is incremented or decremented each time, and the value is displayed on the display element corresponding to the welding schedule one by one. be done. When the operation of the first data input key or the second data input key stops, the set value of the schedule code is determined. Next, for example, when the selection key corresponding to the maximum current value is pressed, the maximum current value can be set and input, and under this state, when the first or second data input key is pressed an appropriate number of times,
The set value of the maximum current value becomes the desired value. In this case, the display element corresponding to the maximum current value displays how the set input value of the maximum current value changes with time. Similar setting operations and operations are performed for other welding conditions. In addition, even values that have been set and input once can be easily changed, since pressing the selection key will enable resetting and inputting. The setting input values of each setting item are associated with each welding schedule and written to a predetermined storage address of the storage means. In this way, in the present invention, for any setting item, when the corresponding selection key is pressed, the setting can be input immediately, and in this state, each time the first or second data input key is pressed, Increment or decrement the configuration input value for that configuration item. Then, this setting input value is displayed for each setting item on a display element located close to the selection key, and the setting values for all setting items are displayed at the same time. This results in
From the worker's point of view, they can easily check what values are currently being input for which setting items for which welding schedule, and also know the setting values for other setting items at the same time, so they can easily check the setting input status. can be easily and reliably understood. Further, since the set values of the welding schedule are stored in the storage means, a large number of welding schedules can be set using a common selection key, data input key, and display element. Furthermore, the data input keys consist only of the first and second data input keys for incrementing and decrementing the setting value of each setting item, no matter how many types of setting items or number of digits of setting values increase. , the key input mechanism does not become complicated or expensive. In the operation mode, a schedule signal instructing a welding schedule to be executed is input from an external device to the schedule input means. Every time this schedule signal is input, the display control means reads out the schedule code and welding condition setting values of the welding schedule from the storage means, and displays them on the respective corresponding display elements. When this welding schedule is executed, the measuring means obtains measured values such as current values, and the display controlling means displays these measured values on the respective corresponding display elements. This allows workers to simply look at the front panel of a single welding control device even when multiple welding schedules are being executed continuously.
You can easily see at a glance which welding schedule was currently executed under what setting values and what welding results were obtained. (Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 shows the front panel of the resistance welding control device according to this embodiment. As shown in the figure, a large number of keys and indicators are provided, and they are classified according to function or setting content as follows. (1) Welding schedule section 12 Here, there is a "condition input" key 1 for setting and inputting the code (number) of the welding schedule.
4, and a "condition input" display element 16 for displaying the code of the welding schedule input or selected by the key 14. (2) Cycle section 18 Here, the following setting input keys are arranged side by side in the horizontal direction. (A) "Squeeze" key 20 Key for setting and inputting squeeze time T _SQ . (B) "Weld I" key 22 Key for setting and inputting weld time T _W1 . (C) "Cool I" key 24 Key for setting and inputting the cool time T _C1 . (D) "Slope" key 26 Key for setting and inputting slope time _TSL . (E) “Weld” key 28 Key for setting and inputting weld time T _W2 . (F) "Cool" key 30 Key for setting and inputting the cool time T _C2 . (G) “Weld” key 32 Key for setting and inputting weld time T _W3 . (H) "Hold" key 34 Key for setting and inputting the hold time T _HO . (I) "Off" key 36 Key for setting and inputting the off time T _OF . Further, above the keys 20 to 36, the following display elements 38 to 54 corresponding to the respective keys are arranged in parallel in the horizontal direction. (a) “Squeeze” display element 38 A display element that displays the squeeze time T _SQ . (b) "Weld I" display element 40 A display element that displays the weld time T _W1 . (c) "Cool I" display element 42 A display element that displays the cool time T _C1 . (d) "Slope" display element 44 A display element that displays slope time _TSL . (e) “Weld” display element 46 A display element that displays the weld time T _W2 . (f) "Cool" display element 48 A display element that displays the cool time T _C2 . (g) “Weld” display element 50 A display element that displays the weld time T _W3 . (h) “Hold” display element 52 A display element that displays the hold time T _HO . (i) "Off" display element 54 A display element that displays the off time T _OF . Here, squeeze time T _SQ , weld I time
T _W1 , cool time T _C1 , slope time T _SL , weld time T _W2 , cool time T _C2 , weld time T _W3 , hold time T _HO , off time T _OF
1, as shown in the welding sequence displayed on the panel surface above the display elements 38 to 52.
These are temporal welding conditions included in one welding condition schedule. (3) Pressure No. section 56 Here, a "valve" key 5 is used to select one of a plurality of preset electrode tip pressure forces according to the welding schedule.
8, and a "pressure No." display element 6 that displays the code of the pressure force selected by this key 58.
0 is arranged. (4) Dot monitor section 62 Here, there is a "count" key 64 for setting and inputting the count number of the dot monitor corresponding to the above-mentioned pressure No., and a "count" key 64 for setting and inputting the count number for the dot monitor corresponding to the above-mentioned pressure No., and the input count number set and inputted above as necessary. A "dot monitor" display element 66 for display is arranged. (5) Current section 68 Here, the following setting input keys related to current values are arranged in parallel in the horizontal direction. (A) "Maximum current" key 70 Key for setting or selecting the maximum current value for the relevant welding schedule. (B) “Current” key 72 Weld time of the relevant welding schedule
T Key for inputting or selecting the current value at _W1 . (C) “Current” key 74 Weld time of the relevant welding schedule
T Key for inputting or selecting the current value in _W2 . (D) “Current” key 76 Weld time for the relevant welding schedule
Key for setting and inputting the current value at T _W3 . Moreover, the following display elements are arranged above the keys 70 to 76. Second "current" display element 78 A display element that selectively displays the maximum current value, current value, set value or measured value of the current value. Second "current" schedule 80 A display element that selectively displays the set value or measured value of the current value. (6) Monitor section 82 Here, there is a "conduction angle" key 84 for setting and inputting the maximum conduction angle, and a "+ A "setting" key 86 and a "-setting" key 88 are arranged side by side in the horizontal direction. Further, above the keys 84 to 88, a "monitor" display element 90 is arranged to selectively display the set values or monitor values (measured values) of the maximum conduction angle, + side and - side current fluctuation values. It is set up. (7) Step-up section 92 Here, the step-up step number,
"Step No." key 94 for setting and inputting the up rate and count number, "Up rate"
A key 96 and a "count" key 98 are juxtaposed. Then, the "step No." display element 1 displays the step number above the "step No." key 94.
00 is disposed, and an "up rate/count" display element 102 for selectively displaying the step up rate or the number of steps is disposed above the "up rate" key 96 and the "count" key 98. (8) Program section 104 Here, there is a "program" key 106 for putting the device into program mode, the above-mentioned welding schedule section 12, cycle section 18, pressure No. section 56, dot monitor section 62, and current section. 68, the setting value selected with the various keys of the monitor section 82 and step-up section 92 is increased by +1.
"+1 data input" key 108 to increment (increment), -1 decrement (decrement)
A "-1 data input" key 110 is provided. (9) Operation section 112 An "operation" key 114 for putting the device into operation mode is provided here. (10) Monitor section 116 The following monitor lamps are provided here. (A) "Welding possible" indicator lamp 118 A lamp that lights up when all predetermined conditions such as control power and welding power are being supplied are met. (B) “Welding power source” indicator lamp 120 A lamp that lights up when welding power source is being supplied. (C) “No power” indicator lamp 122 A lamp that lights up when no power is applied or the toroidal coil is disconnected. (D) "Thermo trip" indicator lamp 124 A lamp that lights up when the thyristor thermo connected to a predetermined rear terminal (not shown) becomes open circuit. (E) “Thyristor failure” indicator lamp 126 This lamp lights up when the thyristor is short-circuited and becomes conductive. (F) "Current Caution" indicator lamp 128 A lamp that lights up when the energized current exceeds the maximum current setting value, + side current fluctuation setting value, or - side current fluctuation setting value. (G) “Insufficient dots” indicator lamp 130 This lamp lights up when the dot monitor function detects a lack of dots. (H) “Step end” indicator lamp 132 A lamp that lights up when the final step of current step-up is completed. Further, a "reset" key 134 is provided for canceling the abnormal state, and when this key is pressed, all of the lamps 118 to 132 that were lit are turned off. (11) Welding section 136 A "welding on/off" key 138 for turning the welding control ON/OFF is provided here. The functions of the various keys and display elements on the front panel of the resistance welding control device of the present invention have been explained above.
The keys preferably consist of tactile switches that make a clicking sound when pressed, and the display elements preferably consist of a 7-segment LED (light emitting diode) display, and a lamp 11.
8 to 132 may be composed of LED lamps. Note that keys 70 to 76 of current section 68, keys 84 to 88 of monitor section 82, and step-up section 92
keys 96 and 98, key 1 of the program section 104
06, key 114 of operating part 112 and welding part 1
36 key 138 has an LED lamp (for example, 70
a, 96a) are attached. these
The LED generally lights up when the relevant key is pressed in the operating mode, and at that time the set value is displayed on the corresponding display element. Some devices light up whenever the key is pressed to indicate that data can be changed. These keys without LED lights only work in program mode and are disabled in operating mode. System Configuration FIG. 2 shows the system configuration of the resistance welding control device 10 of the present invention. The system bus 150 has
CPU (central processing unit) 152, RAM (random write/read memory) 154, ROM (read-only memory) 156, reference counter 158, panel controller 160, input/output interface (I/O
O) 162 and A/D converter 164 are connected. The CPU 152 controls the operation of each component and the entire device according to the control program, display program, key input routine, etc. stored in the ROM 156, and also calculates the measured value of welding current and compares the set value and the measured value. Performs various calculations such as judgment. In addition to temporarily storing various calculation data obtained by the CPU 152 in the RAM 154, the schedule code and setting values entered from the front panel keys (panel keys) for each of the set welding schedules are stored in the RAM 154, for example, as shown in FIG. Store them in correspondence as shown in . In Figure 3, J1,
J2,... represents the schedule code (number),
a1, a2,..., b1, b2,..., etc. represent set values (numeric data). The panel controller 160 has a buffer memory that stores setting value data or measured value data sent from the CPU 152, and distributes and displays the data to the corresponding panel display elements. Reference counter 158 generates a reference clock. In addition, the I/O 162 transmits the control signal sent from the CPU 152 to the thyristor firing circuit 1.
At the same time, it receives a start signal (schedule signal) instructing to start welding from a welding machine, etc., and sends it to the CPU 152.
The A/D converter 164 receives an analog welding measurement signal from the waveform restoration circuit 168 or the waveform amplification circuit 170 and converts it into a digital signal.
Send to CPU152. Note that the pressurization output selection section 172
AC power is applied to the pressurizing valve corresponding to the code according to the pressurizing force No. code sent from the
Supply 100V. The control power supply unit 174 includes a control power transformer 176
The AC power supply is input through the AC power supply, and a predetermined operating power supply voltage is supplied to each part of the system. The phase detection circuit 178 includes a synchronization transformer 180
The welding power supply voltage E is input through the system, and a synchronization signal or timing signal synchronized with that frequency (50 or 60Hz) is given to the system. The power supply voltage detection section 182 includes a synchronization transformer 18
0 is detected, and a compensation voltage that compensates for the variation is applied to the A/D converter 164. Further, 184A and 184B are thyristors forming contacts, 186 is a welding transformer, and 188 is a welding transformer.
is a current transformer for measuring the primary side welding current, 1
90 is a toroidal coil for measuring secondary side welding current, 192 is a primary side/secondary side switching circuit, and 1
94 is a material to be welded. Overall Operation Next, the operation of the resistance welding control device 10 of the present invention will be explained with reference to the flowcharts of FIGS. 4 and 5. (A) Program mode (Figure 4) (a) First, when the program key 106 is pressed, the program mode for inputting settings is entered (step). (b) Next, when the "condition input" key 14 is pressed, the "condition input" display element 16 flashes and the welding schedule code can be input.
In this state, press the “+1 data input” key 108.
Alternatively, operate the "-1 data input" key 110 to set (select) the welding schedule (step, ). Thereby, if setting values have been previously registered for that welding schedule, those setting values are displayed on the respective corresponding display elements. (c) Next, when you press the key corresponding to the desired setting value to input or change it (step), the corresponding display element above that key will blink, so you can select the "+1 data input" key 108 or the "-" key. 1 data input" key 110 to input or change the set value (step). (d) Repeat the operation in (c) above to input or change all desired setting values (step). (e) Then, repeat the operations (b) to (d) above to input settings for each of the welding schedules (for example, 1 to 15) to be used (step). After that, press the operation key 114 at an appropriate time to start the program. mode to operation mode. At the same time as this switching, the set value changes to the format shown in Figure 3, for example.
Registered in RAM154. (B) Operation mode (Figure 5) In the operation mode, before executing a welding schedule, the CPU 152 waits for a schedule signal given from a welding machine, etc. (step), and upon receiving that signal, the CPU 152 executes the schedule code and code for that welding schedule. Setting value RAM1
54 and send them to the panel controller 160. As a result, the "condition input" of the welding schedule section 12 is displayed on the front panel.
The welding schedule code (number) is displayed on the display element 16, and the cycle section 1
The squeeze time T _SQ is displayed on the "squeeze" display element 38 of No. 8, and the first "current" of the current section 68 is displayed.
On the display element 78, the maximum current value, the current value, and the set value of the current value are selectively displayed (steps). Then, when welding is started, the pressure No. 56
"Pressure No." display element 60 and monitor section 116
The pressurization and welding process is displayed on the "weldable" indicator lamp 118 (step). When welding is performed normally, the predetermined monitor value is displayed on the front panel (step,
) For example, the maximum current value, the current value, and the measured value of the current value are selectively displayed on the first "current" display element 78 of the current section 68, and the "monitor" display element 90 of the monitor section 82 displays the maximum conduction angle, + Measured values of side and negative current fluctuation values are selectively displayed. After that, it waits for the next schedule signal in this state. However, if an abnormality occurs, the monitor unit 11
6, the details of the abnormality are displayed (step). For example, if the current transformer 188 or the toroidal coil 190 is disconnected, the "no power" indicator lamp 122 lights up. In such a case, when the "reset" key 134 is pressed, the lamp 122 will turn off and the abnormal display will be canceled (step, ).
Wait for the next schedule signal. Then, when the next schedule signal is given, the same operation as described above is repeated. (Effects of the Invention) By having the above-described configuration, the present invention provides the following effects. (1) In program mode, schedule codes and setting values for various welding conditions are input in advance for a large number of welding schedules and stored in a predetermined memory location, and in operation mode, in response to schedule signals from external equipment, The schedule code and setting values corresponding to the welding schedule to be executed are automatically read out and displayed, and various measured values obtained as a result of the execution of the welding schedule are displayed, so one machine can handle many welding schedules. can correspond to (2) The selection keys and display elements are placed close to each other for each setting item, and the setting values for all setting items are displayed at the same time.In the program mode, you can see which setting item is currently used for which welding schedule. At a glance, you can quickly and easily understand what values are being set and input, what the settings are for other setting items, etc. In addition, in operation mode, even if a large number of welding schedules are executed continuously, you can check which welding schedule is currently being executed at what setting values and what welding results are by simply looking at the front panel of one welding control device. You can easily and reliably know at a glance whether the results have been obtained or not. (3) Since all data (schedule code, welding conditions) can be entered using the common first and second data input keys using the increment and decrement method, the types of setting items and the number of digits of the setting values can be changed. No matter how many keys are added, the key input mechanism will not become complicated or expensive.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the front panel of a resistance welding control device according to an embodiment of the present invention, FIG. 2 is a diagram showing the system configuration of the present invention, and FIG.
FIG. 4 and FIG. 5 are flowcharts showing the operation of the resistance welding control device of the present invention, and FIG. FIG. 7 is a diagram showing the front panel of the welding control device.
FIG. 8 is a diagram showing a front panel of another conventional resistance welding control device, and FIG. 8 is a diagram showing an address table used in the resistance welding control device of FIG. 7. 10... Resistance welding control device, 14... "Condition input" key, 20-36... Cycle section keys, 5
8... "Valve" key, 64... "Count" key, 70-76... Current section keys, 84-88...
...Keys of the monitor section, 94-98...Keys of the step-up section, 106..."Program" key,
108... "+1 data input" key, 110...
"-1 data input" key, 114... "operation" key, 134... "reset" key, 16... "condition input" key, 38-54... display element of cycle section, 60... "pressure No.” display element, 66...
"Dot monitor" display element, 78...first "current" display element, 80...second "current" display element, 90...
..."Monitor" display element, 100..."Step
No." display element, 102..."Up rate/count" display element, 118...Lamp of monitor section,
152...CPU, 154...RAM, 156...
ROM, 160...Panel controller, 162
...I/O, 190...Troidal coil.

Claims (1)

[Scope of Claims] 1. A resistance welding control device configured to set various welding conditions and display measured values for predetermined welding conditions, each of which corresponds to one setting item of a welding schedule or welding conditions. and a setting item selection means consisting of a large number of selection keys for enabling setting input for the setting item, each of which corresponds to one of the setting items or measurement items, and the selection corresponding to the setting item. a display means consisting of a large number of display elements disposed close to the key, and incrementing the set value of each setting item for which setting input is enabled by the setting item selection means;
key input means consisting of first and second data input keys for decrement; storage means for storing the setting values of each setting item for each of the set welding schedules at a predetermined address; and the selected welding schedule. A schedule signal input means for inputting a schedule signal given from an external device prior to execution of the schedule; and a measuring means for measuring predetermined welding conditions for a welding schedule to be executed immediately after inputting the schedule signal and obtaining the measured value. In the program mode, the setting values of the setting items are displayed on the corresponding display elements, and in the operation mode, in response to the schedule signal, the setting values for the welding schedule are read out from the storage means and displayed on the corresponding display elements. 1. A resistance welding control device comprising: display control means for displaying measured values given by the measuring means on respective corresponding display elements.