JPS63192576A - Monitoring device for resistance welding - Google Patents

Abstract

PURPOSE:To reduce the size of the titled device and to simplify it by providing a set of indicators for a reference set value by a conditional item of an electrification current, etc., and arranging a memory to store conditional numbers and related plural reference criterion values. CONSTITUTION:A display device 11 for set values of the electrification current and the number of electrification cycles, a current and the number of cycles, etc., at the time of welding is provided and connected with a bus 3 via an interface 12 for displaying. Further, a RAM 4 and the fixed memory 5 are connected with the bus 3 and arranged thereto and an upper limit value and a lower limit value of the current set by an incremental key 7 and a decremental key 8 are stored in the memory 5 and the different plural welding conditions are simplily set by only one set of indicators of the display device 11. In this way, a mechanism of the titled monitoring device is simplified and the size of the whole of the device is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for setting a reference value with which measured values such as energizing current and energizing cycle are compared in resistance welding monitoring.

[Conventional technology]

Resistance welding monitoring usually involves measuring the current and number of cycles, comparing these measured values with respective predetermined reference values, and judging whether the welding result is acceptable or not based on the magnitude of these values. It is something to do.

Conventionally, when monitoring resistance welding, the method of setting a reference value to which each measured value is compared has been to
A set of multi-digit digital switches for setting upper and lower limit values is provided for each measurement item of the number of energizing cycles, and by manually operating the digital switch for the lower limit value, the energizing current and number of energizing cycles can be determined. An upper limit value and a lower limit value were set.

Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 58-176087, a system in which a reference value is set using a keyboard switch is also known.

[Problem that the invention seeks to solve]

In the conventional reference value setting method using digital switches as described above, only one set of reference values can be set on one monitor. Therefore, the reference value for each digital switch must be set every time the welding conditions are changed. The settings must be corrected, and the setting operation becomes extremely complicated. Furthermore, a plurality of digital switch groups each having a digital switch for each item of welding conditions are provided for each welding condition, and a desired one of the plurality of digital switch groups is selected by an external selection command. However, in this case, as the welding conditions increase, the number of digital switches will increase in multiplication type, the equipment will become larger, and the operation of setting the reference value will be complicated and require a lot of effort. Comment 1- There is a problem with high

In addition, with the keyboard method, the monitor display section for displaying each set value is common, so if you do not fully understand the setting contents, it is not easy to determine what data is currently being set. Furthermore, since a large number of various function keys are arranged in addition to numerical keys, there is a problem that setting operations are complicated and erroneous settings are likely to occur.

This invention was made to solve the above-mentioned problems, and it is possible to easily set and display reference values corresponding to a plurality of welding conditions at a low cost using several keys and one set of display means. It is an object of the present invention to provide a resistance welding monitoring device that achieves the above-mentioned results.

[Means for solving problems]

The resistance welding monitoring device according to the present invention includes a display that displays a welding condition number, a display that specifically displays reference setting values for each condition item such as the number of energizing currents and energizing cycles constituting the welding conditions, and Increment 1- to set the welding condition number or the reference value of the corresponding condition item for each display specified by the 31 number display and the above-mentioned reference set value display, and the above-mentioned shift key. The condition number display and each standard setting value display are sequentially set and controlled based on the signals from the shift key and the shift key, and the signals from the increment key and decrement key are processed. A control means for setting and displaying reference value contents of a designated display device;
It is provided with a memory which is controlled to read and write by the control means and stores a plurality of the condition numbers and reference values related thereto for each welding condition.

[Effect]

In this invention, when setting the condition number of welding conditions and each reference value related thereto, when the shift I key is operated, the condition number display is sequentially shifted from the condition number display to the reference setting value display for each item, By operating the increment key and the decrement key on the designated display, the condition number or reference value will be set.

Therefore, by repeating the above setting operation according to a plurality of necessary welding conditions, it becomes possible to set reference values for a plurality of welding conditions with one set of indicators.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a system configuration diagram of a resistance welding monitoring device equipped with a reference value setting method according to the present invention. In FIG. 1, 1 is a central processing unit (hereinafter abbreviated as CPU) that executes and manages the setting of reference values for the energizing current and the number of energizing cycles, the pass/fail judgment process for the energizing current and the number of energizing cycles, and the display processing of these processes. ), 2 is a program memory (hereinafter referred to as RO) connected to the CPU via bus 3
M) stores the various processing programs described above. Reference numeral 4 denotes a memory (RAM) connected to the CPU 1 via a bus 3, in which data such as calculation results in the CPU 1 is temporarily stored.

A non-volatile memory 5 stores reference setting values for various resistance welding conditions, and is connected to the CPU 1 via a bus 3.

Also, 6 is the shift 1-key, 7 is the increment 1-key,
8 indicates a decrement key, among which keys 7 and 8
are used to input reference setting values for welding conditions, and shift keys 1 to 6 are used to sequentially specify each setting condition item, such as the upper and lower limits of the energizing current and number of energizing cycles when setting the reference value. . 9 is a mode changeover switch for switching the resistance welding monitor to a setting mode or a measurement mode.

The keys 6 to 8 and mode changeover switch 9 are connected to the CPU 1 via an interface 10 and a bus 3.

Reference numeral 11 denotes a display device for displaying the set values of the current and the number of cycles, the current and number of cycles during welding, and the pass/fail judgment.
It is connected to the.

The display device 11 includes, as shown in FIG. 2, an upper limit setting value display 111 and a lower limit setting value display 112 for the energizing current;
A current value display 113 that displays the actual welding current, a current judgment display 114 that displays the pass/fail judgment result of the current, an upper limit set value display 115 and a lower limit set value display 116 for the number of energization cycles, and the actual welding current. It is composed of an energization cycle indicator 117 that displays the number of energization cycles, an energization cycle judgment display 118 that displays the pass/fail judgment result of the energization cycle, and a display 119 that displays the welding condition number, and these indicators are connected to the control box. 13 on the front panel 13a. Similarly, shift key 6, increment key 7, decrement key 8 and mode changeover switch 9
is also arranged on the front panel 13a.

In Fig. 1, numeral 14 is a welding current detector consisting of a toroidal core that detects welding current and an integrating circuit that integrates its output voltage and restores the original welding current waveform. It is connected to the bus 3 via an A-D converter 15 for conversion.

Next, the operation of this embodiment configured as described above will be described.

FIG. 3 is a flowchart 1- showing the procedure for setting the energizing current and the number of energizing cycles. When setting the energizing current and the number of energizing cycles under various welding conditions, first in step 20, the mode selector switch 9 is switched to the 1 setting side, and the resistance welding monitor system is set to the welding condition setting mode.

Then, the condition setting program starts, step 2
1, a blinking command is given from the CPU 1 to the condition number display 119 via the bus 3 and the interface 12, so that the display on the display 119 blinks. At the time of O, the numbers blinking on the display 119 are 0 to 9.
This number is the number that was set during measurement mode.

Next, in step 22, the increment key 7 or decrement key 8 is operated to set the desired condition number. A one-pulse signal generated each time the increment key 7 or decrement key 8 is turned on is sent to the CPU 1 through the interface 10 and the bus 3.
be taken in. The CPU 1 performs increment or decrement processing every time a signal is input from the key 7 or 8, and outputs the numerical data to the condition number display 119 through the interface 12 for display.

Then, when the condition number you want to set is displayed, press key 7.
Or stop the operation in step 8. Next, in step 23, the shift key 6 is turned on once. When the resulting key signal is taken into the CP'UI through the interface 10, the set condition number data is stored in a predetermined memory space of the non-volatile memory 5, and a blinking command is issued to the display of the next setting item. give. That is, in step 24, the current upper limit setting value display], ],
] will be deducted. Then, in the next step 25, one or both of the increment key 7 and decrement key 8 is operated to set the current upper limit value.

The key signals accompanying the operations of keys 7 and 8 are taken into the CPU 1, and are incremented or decremented by the CPU 1, and the processing results are displayed on the current upper limit set value display N111. Here, once the display content on the display 111 is set to the desired value, key operations are stopped, and in the next step 26, the shift key 6 is turned on once.

As a result, the current upper limit value data is stored in the memory space of the nonvolatile memory 5 corresponding to the condition number, and at the same time, the CPU 1 commands the next setting item, that is, the blinking command to the current lower limit setting value display 112. is given to indicate that it is possible to set the lower limit value of the current (step 27).

Then, in the next step 28, one or both of the increment key 7 and the decrement key 8 are operated to set the current lower limit value.

Thereafter, in step 29, the shift key 6 is operated again to move to the step of setting the number of energization cycles corresponding to the welding condition number set in step 22. Step 3
0 is a processing step for setting an upper limit value and a lower limit value of the number of energization cycles, and although a detailed explanation thereof will be omitted, it is performed in accordance with steps 24 to 28 described above.

When the setting of the energizing current and the number of energizing cycles for the welding condition number set in step 22 is completed, the shift key 6 is operated in the next step 31. Then, the blinking position returns to the condition number display 119. At the time of Otsu,
The condition number set in step 22 is displayed blinking on the display 119, and each display 111, 112, 1
The set value of the condition number is displayed at 15° 116 (step 32). Then, in the next step 33, it is determined whether all the welding conditions to be used have been set. This is determined by the operator after looking at the display results in step 32.

When the determination result in step 33 is rYEsJ, the process proceeds to step 34, where the mode changeover switch 9 is switched to the "1 measurement" mode. When rNOj, the process returns to step 22 and the next welding condition number is selected again. Set.

Next, the operation during measurement will be explained.

When monitoring resistance welding, first a selection switch (not shown) is operated according to the welding conditions of the resistance welding machine.

When the selection signal is thereby taken into the CPU 1, the condition number corresponding to the welding condition and the upper and lower limit value setting data of the current and cycle related thereto are read out from the nonvolatile memory 5 based on this selection signal. The setting data is set in the RAM as a reference value, and the upper and lower limit settings of the energizing current are displayed on displays 111 and 112, respectively, and the upper and lower limit setting values of the number of energizing cycles are displayed on the display 115. , 116, and the condition number is further displayed on the display 119.

Here, when a welding current flows due to the welding operation of the resistance welding machine, the welding current is detected by the current detector 14, and the welding current is detected by the current detector 14.
- Converted to digital quantity by D converter and sent to CPU
be taken in. The CPU calculates the effective value of the energizing current and the number of energizing cycles, displays these on the current value display 113 and the energizing cycle display 117, and also compares the current value with the current upper limit setting value and the current lower limit setting value, and calculates the current value. The results are displayed on the current determination display 114. Then, the energization cycle value is compared with the cycle upper limit setting value] 15 and the cycle lower limit setting value 116, and the result is displayed on the cycle judgment display 118.

This completes the first measurement.

When the next welding is performed under conditions different from the first welding, input a selection signal from the corresponding selection switch, and thereby set the standard setting values of the new welding conditions on the respective displays @111, 11.
2, 115, 116, 119 and waits for the second energization.

In the resistance welding monitoring device of this embodiment, when setting the reference lower limit value of the resistance welding condition number and the corresponding energizing current and number of energizing cycles, it is possible to The welding number is shifted to a special display that displays the upper and lower limits of the corresponding current and cycle number in the order of 119-111-112→115→116. - Since the reference values of each setting item are compared by operating the key 7 and the decrement key 8, and these setting values are stored in the non-volatile memory 5, only one set of indicators for setting the reference is required. If you want to change the condition number,
It is possible to set reference values for each current and number of cycles for multiple sets of welding conditions, and when setting the reference values, each item is designated sequentially using the shift key 6, and the display blinks when designated. Since there are only 3 keys, 6 shift keys, 7 increment keys, and 8 decrement keys, the operation for setting the reference value is easy, and the operation of setting the reference value is easy. The monitor front panel 13a can be made simple, and the monitoring device can be made smaller and cost-effective.

In the above embodiment, the welding condition setting items are current and number of cycles, but a method of setting voltage or power and time may also be used.

In addition, in the above embodiments, the current and cycle number are higher.

Although the method of setting and displaying the lower limit value has been described, the present invention is not limited to this method.

〔Effect of the invention〕

As described above, according to the present invention, there is provided one set of indicators for reference setting values for each condition item such as the welding condition number display and the number of energizing currents and energizing cycles constituting the welding conditions, and each reference value of the welding conditions is provided. When setting, use the shift key to sequentially shift from the condition number display to the standard setting value display for each item, and use the increment and tickment keys to change the condition Since the number or reference value is set, displayed, and stored in memory, only one set of display units is required for setting the reference value. Welding conditions can be set, and the settings are also easy.

Moreover, since the reference value of the relevant welding condition can be displayed on the display and judged during measurement, it is possible to easily provide a low-cost, small-sized, multi-strip resistance welding monitoring device.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram showing an example of a resistance welding monitoring device according to the present invention, Fig. 2 is a front view of the display panel section in this embodiment, and Fig. 3 shows a procedure for setting reference values in this embodiment. It is a flowchart. 1-, CPU, 2--ROM, 3... bus, 4- RA
M, 5-Non-volatile memory, 6--Shift key, 7--Increment key, 8-Decrement key, 9--Mode selector switch, 11--Display device, 14--Current detector, 15--A-D Converter, 111 Current upper limit value display, 112 Current lower limit value display, 113... Current value display, 114... Current judgment display temperature, 115... Cycle upper limit value display, 116... Cycle lower limit value display, 117
- Energization cycle indicator, 118... Energization cycle determination indicator, 119... Condition number indicator. 6...Shift key

Claims (1)

[Claims] A display device that displays a welding condition number in a resistance welding monitoring device that measures the current, number of cycles, etc. during resistance welding, and compares the measured values with predetermined reference values to determine whether welding is successful. and a display for specifically displaying standard set values for each condition item such as the energizing current and number of energizing cycles that make up the welding conditions; a shift key for specifying the condition number display and each standard set value display; An increment key and a decrement key set the welding condition number or the standard value of the corresponding condition item for each display specified by the shift key, and the condition number display and each standard are set based on the signal from the shift key. a control means for sequentially setting and controlling the set value display and processing signals from the increment key and the decrement key to set and display reference value contents of the specified display; A resistance welding monitoring device comprising a memory that is controlled to read and write and stores a plurality of condition numbers and reference values related thereto for each welding condition.