JP3391219B2 - Automatic resistance welding equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic resistance welding apparatus capable of efficiently re-welding when restarting after an abnormality occurs.

[0002]

2. Description of the Related Art Conventionally, when an automatic resistance welding apparatus having two or more welding points is in operation and a welding abnormality, various abnormality of the apparatus, or a power failure occurs, the apparatus is returned to the initial state before the start of operation. Is the method of restarting the method of re-welding the already well-welded points, "Welding
When the operation is started with the "OFF" selection switch set to "Welding OFF", the operator of the automatic resistance welding device confirms "Welding ON" when the welding is not performed well or the driving means approaches the vicinity of the unwelded point. One of the methods was used in which welding was performed by setting the "-off" selection switch to "welding on" and operating the welding means.

[0003]

When a conventional welding abnormality, various abnormalities of the apparatus, or a power failure occur, the apparatus is returned to the initial state before the operation is started and then restarted, and welding is already well performed. It is a method of welding again the points
Pinholes may be generated in the work piece, or the work piece may melt and result in defective welding.

On the other hand, the operation is started by setting the "welding on / off" selection switch to "welding off" and visually confirming whether welding was not performed well or the driving means approached the vicinity of the unwelded point. If welding is performed by setting the "Welding ON / OFF" selection switch to "Welding ON" and operating the welding means, it is difficult to set the "Welding ON / OFF" selection switch to "Welding ON", and welding is already in good condition. In some cases, the welding point was welded again and the former phenomenon occurred, or conversely, the timing of "welding on" was delayed, and the welding point was sometimes skipped without welding.

The present invention is intended to solve the above-mentioned conventional problems, and at the time of restarting after an abnormality occurs, only the driving means is driven at the point where good welding is performed, and good welding is not performed. The high or non-welding point relates to an automatic resistance welding device that performs welding by operating the welding means together with the driving means.

[0006]

In order to solve this problem, the first means of the present invention is an input means for inputting a welding point and a first storage means for storing the welding point input from the input means. Storage means, control means for inputting data of the first storage means, welding means for welding an object to be welded controlled by the control means, and at least an object to be welded or welding means controlled by the control means And a second storage means for storing data from the detection means, the first means at the time of restarting after an abnormality occurs.
Comparing the data of the storage means with the data of the second storage means, the welding point where welding is performed well is driven only by the driving means, and the welding point where welding is not performed well or the unwelded point is driven means In addition to this, the welding means is operated to perform welding.

A second means of the present invention is that, of the first means, the second storage means holds data regardless of whether the power supply is on or off.

A third means of the present invention is the above first or second embodiment.
Among these means, the first storage means stores the welding point and the welding condition at the welding point.

The fourth means of the present invention is, out of the above-mentioned first to third means, two or more electrodes adapted to the material to be welded as welding means, and an opening / closing means for opening / closing the electrodes. And a control means for selecting the electrode according to the material of the object to be welded at the welding point.

The fifth means of the present invention is, in any of the above-mentioned first to fourth means, the second storage means, the welding point and
It is for storing a welding condition of it.

The sixth means of the present invention has a jig for placing an object to be welded among the means according to any one of the first to fifth aspects, and the object to be welded is placed on the jig. A second detection means for detecting whether or not there is a second storage means is provided, and when the object to be welded is removed from the jig, the data in the second storage means is reset.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A first aspect of the present invention is an input means for setting and inputting a welding point, a first storage means for storing a welding point input from the input means, and the first storage. Welding means for inputting data of means, welding means controlled by the control means for welding an object to be welded, and drive means controlled by the control means for moving at least the object to be welded or the welding means. Detecting means for detecting whether or not the operation has been performed satisfactorily, and second storing means for storing data from the detecting means are provided, and the data and the second storing in the first storing means at the time of restarting after an abnormality occurs. The data of the means are compared by the control means, only the driving means drives the points where good welding is performed, and the welding is not performed well, or the unwelded points move the welding means together with the driving means. Welding is performed by restarting the equipment after returning it to the initial state before starting the operation. It is possible to obtain the effect of welding only unwelded or unwelded points.

According to the second aspect of the invention, since the second storage means is configured to retain the data regardless of whether the power source is on or off, the welding can be performed well even after a power failure or a work interruption during welding. It has the effect of being able to store points.

According to a third aspect of the present invention, the first storage means is provided with a welding point and a storage means for storing the welding conditions at the welding point, and it is possible to store the welding current and electrode pressure force during welding. Have.

According to a fourth aspect of the present invention, as welding means, two or more electrodes suitable for the material of the object to be welded, opening / closing means for opening and closing the electrodes, and the electrode are selected according to the material of the object to be welded at the welding point. With the control means, it is possible to obtain the effect that welding suitable for the material of the workpiece can be performed.

A fifth aspect of the present invention includes means for detecting the welding state of the welding point input to the second storage means by the detection means, and has an effect of detecting whether or not the welding is performed well. .

According to a sixth aspect of the present invention, there is provided a jig for placing an object to be welded, and a second detecting means for detecting whether or not the object to be welded is placed on the jig. By resetting the data in the second storage means when the object is removed from the jig, when a workpiece to be welded having the same part number is newly placed on the jig, welding is started from the first point. The effect of being able to go is obtained.

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 is an input means for inputting a set value such as a welding point number, a welding condition selection number, an electrode selection suitable for a workpiece, an electrode pressing force, etc. by an alphanumeric numeric keypad and a display. Reference numeral 2 is a first storage means for storing various data input from the input means 1 by using a programmable controller (hereinafter referred to as a sequencer) or a personal computer (hereinafter referred to as a personal computer). Reference numeral 3 is a control means for inputting the first storage means 2 using a sequencer or the like, and 4 is welding means for applying a welding current to a welding current control device, a welding transformer, an electrode pressurizing device, an electrode, etc. is there. Reference numeral 5 is a drive means for driving a servo controller, a robot using a servo motor, or the like by the control means 3, and moves at least an object to be welded or an electrode. Reference numeral 6 is a detection means using a welding monitor for detecting whether or not welding is performed well, and reference numeral 7 is a second storage means for storing the data from the detection means 6 using a sequencer or the like.

The operation of the automatic resistance welding apparatus configured as described above will be described below with reference to the operation explanatory view of FIG. 3 and FIG.
Will be explained. FIG. 3 is an explanatory diagram of the operation of the automatic resistance welding device according to the first embodiment of the present invention. 8 is the object to be welded, the ● mark is the point to weld with the A electrode, ○
The mark is the point of welding with the B electrode. The A electrode and the B electrode have different electrode materials, and are properly used at the time of welding depending on the material of the workpiece. In FIG. 3, A1, A2, B3 ...
The symbol A17 indicates the order of welding, the letters A and B of the alphabet indicate the electrodes to be used, and the numbers indicate the order of welding points. For example, A2 means that the electrode used at the second welding point is A.

Data setting such as welding point number, electrode selection, welding condition selection number, etc. corresponding to the welding sequence of FIG. 3 is performed through the input means 1 such as the alphanumeric numeric keypad of FIG. 1, keyboard, push button switch and data display. Enter the value. Enter these data settings according to the type of work piece and the welding point. When these data set values are input, the data set values are stored in the storage memory of the sequencer or personal computer, which is the first storage means 2. Even after these data set values are stored, the data can be changed by the rewriting operation via the input means 1.

The control means 3 in FIG. 1 uses the data such as the welding point number, electrode selection, electropneumatic proportional valve pressurization value, and welding condition selection number stored in the first storage means 2 in FIG. Welding control device that stores pressurizing time, electropneumatic proportional valve pressurizing value, welding time, welding current for each welding condition selection number, welding transformer that sends welding current, and welding means for welding electrode that pressurizes the workpiece. 4, a robot or the like that moves the welding electrode in accordance with the welding order of the welding points of the work piece (or moves the work piece with the electrode fixed), and electrode pressurization to move the welding electrode up and down or open and close. The drive means 5 using a head cylinder is controlled by the control means 3 using a sequencer or a personal computer.

When welding is performed in the order of the welding points shown in FIG. 3, it is detected by the welding monitor whether or not the welding is successfully performed as the detection means 6 shown in FIG. 1, and the result is detected by the sequencer or the personal computer. It is stored in the storage means 7.

When the welding point indicated by the circle B14 in FIG. 3 was welded, the welding current became insufficient, and the welding monitor of the detection means 6 in FIG. 1 detected that the welding was not performed well. B14 in the second storage means 7 of No. 1
Is stored as a welding abnormality point. After this, the operator of the automatic resistance welding apparatus drives the driving means 5 of FIG. 1 to check the welding state of the workpiece, and returns the welding point of FIG. 3 to the first mark A1 before the operation. . And ○
When the operator checks the welding abnormal point indicated by mark B14 and cancels the abnormal state of the apparatus and restarts the operation, the welding stored in the first storage means 2 of FIG. 1 for each welding point of FIG. By comparing the point number with the welding result stored in the second storage means 7, the welding point determined to be a welding point in which the welding is performed well does not drive the welding means 4 in FIG. Only one driving means 5 is driven. If the welding is not performed well, or if the welding is not yet completed, the welding is performed by driving both the welding means 4 and the driving means 5 shown in FIG. Then, when the welding point in FIG. 3 reaches the  mark 15, since it is an unwelded point, naturally, both welding means 4 and drive means 5 in FIG. 1 are driven to perform welding.
When the welding at the final welding point-mark A17 is completed, the driving means 5 in FIG. 1 is in the original position of the apparatus in the same state as before the operation.

(Embodiment 2) A second embodiment of the present invention will be described. In FIG. 3, the apparatus of FIG. The power may turn off. In such a case,
When the robot or the like which is the driving means 5 is returned to the origin and the operation of the apparatus is restarted, the second storage means 7 in FIG. 1 determines whether or not the welding is performed well regardless of whether the power is on or off. By configuring the storage device so as to hold such data, it is possible to realize an automatic resistance welding device that can be in the same state as before power-off.

(Embodiment 3) In the third embodiment of the present invention, the pressure value of the electropneumatic proportional valve, which is the welding condition stored in the welding control device of the welding means 4 of FIG. It is an automatic resistance welding device in which the pressure value of the electropneumatic proportional valve, which is the welding condition, is stored in the first storage means 2 of FIG. 1 together with the welding point of FIG. 3 without being stored in the welding control device of means 4. .

(Embodiment 4) In the fourth embodiment of the present invention, as the welding means 4 of FIG. 1, two or more electrodes adapted to the material of the object to be welded and the electrodes are opened and closed. This is an automatic resistance welding device configured by an air cylinder and a solenoid valve so that two or more electrodes are selected by the control means 3 of FIG. 1 depending on the material of the object to be welded at the welding point of FIG.

(Fifth Embodiment) A fifth embodiment of the present invention will be described. FIG. 4 is a detailed configuration diagram of the second storage means 7 of FIG. 2 , and 7-1 to 7-N indicate whether or not the welding is performed well when each welding point of FIG. 3 is welded. When the welding monitor of the detection means 6 of FIG. 1 detects and stores the result in the second storage means 7 of FIG. 1, each welding end storage signal corresponding to each welding point of FIG. 7-E is an all-welding end memory signal.

For example, the welding end memory of the welding point ● mark A1 of FIG. 3 is stored in the welding end memory signal of 7-1 of FIG. 4, and the welding end memory of the welding point ● mark A7 of FIG.
It is stored in the welding end memory signal of 7-7. Then, the welding end memory of the welding point ● mark A17 in FIG.
When the welding end memory signal of -N is stored, the all welding end memory signal of 7-E is stored, and upon completion of all welding, the driving means 5 of FIG. 1 returns to the original position state of the apparatus before the operation.

Reference numerals 10-1, 10-2, and 10-N in FIG. 4 are composed of digital switches, rotary switches, and the like, and when the model of the work piece is selected, all the welding points of the work piece are selected. This is a model-specific bypass signal for bypassing and storing the welding end storage signal. In the example of FIG. 4, the welding end signals of the welding points of the model 1 are stored from 7-1 to 7-6, and then the by-type bypass signal 10-1 is bypassed and the all welding end storage signal of 7-E is stored. It is an automatic resistance welding device configured to be stored.

(Embodiment 6) A sixth embodiment of the present invention will be described. In FIG. 2, a second sensor including sensors such as a photoelectric switch, a proximity switch, and a limit switch for detecting whether or not the object to be welded is placed on a jig (not shown) on which the object to be welded is placed. And an automatic resistance welding apparatus configured to reset the data of the welding end memory of each welding point of the second memory means 7 of FIG. 2 when the object to be welded is removed from the jig. is there.

The fact that the data of the welding end memory of each welding point of the second memory means 7 of FIG. 2 is reset is shown in FIG.
7-1 to 7-N welding end memory signals and 7-E all welding end memory signals are also reset.

If the object is not reset, the object to be welded is removed from the jig during welding, and the unwelded object to be welded of the same model is newly placed on the jig. Since it is memorized that the welding was performed well up to the welding point removed from the jig, those welding points do not operate the welding means 4 of FIG. Only operate, so no welding will be done. This is to prevent such non-welding when the object to be welded is newly placed on the jig.

[0034]

As described above, according to the present invention, after welding abnormalities, various abnormalities of the apparatus, or power failure, when the apparatus is returned to the initial state before the start of operation and then restarted, good welding is already performed. Only the driving means operates at the welding point where the welding is performed, and the welding is not performed well, or at the unwelded point, the welding means is operated together with the driving means to perform welding.

Therefore, it is possible to prevent a pinhole from being generated in the welded portion and to prevent the welded object from being melted to cause defective welding, and it is possible to produce a good welded object.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an automatic resistance welding device according to first to fifth embodiments of the present invention.

FIG. 2 is a schematic configuration diagram of an automatic resistance welding device according to a sixth embodiment of the present invention.

FIG. 3 is an explanatory diagram of an operation in the first to sixth embodiments of the present invention.

FIG. 4 is an explanatory diagram of welding end storage means according to a sixth embodiment of the present invention.

[Explanation of symbols]

1 Input means 2 First storage means 3 control means 4 Welding means 5 Drive means 6 Detection means 7 Second storage means 8 Objects to be welded 9 Second detection means

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-9-29457 (JP, A) JP-A-7-185834 (JP, A) JP-A-3-254369 (JP, A) JP-A-62-1 275585 (JP, A) JP 63-36982 (JP, A) JP 63-52777 (JP, A) JP 7-16758 (JP, A) JP 55-2157 (JP, B2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B23K 11/24

Claims (6)

(57) [Claims] 1. Input means for inputting a welding point, first storage means for storing a welding point input from the input means, control means for inputting data of the first storage means, and the control. Welding means for welding the object to be welded controlled by the means, and driving means for moving at least the object to be welded or the welding means controlled by the control means, and a detection means for detecting whether or not the welding is performed well The second storage means for storing the data from the detection means is provided, and the data in the first storage means and the data in the second storage means are compared with each other at the time of re-operation after the occurrence of the abnormality, and the welding is satisfactorily performed. An automatic resistance welding device that drives only the driving means at the welding point and does not weld well, or operates the welding means together with the driving means to perform welding at the unwelded point. 2. The automatic resistance welding apparatus according to claim 1, wherein the second storage means is configured to retain data regardless of whether the power source is on or off. 3. The automatic resistance welding apparatus according to claim 1, wherein the first storage means stores the welding point and the welding condition at the welding point. 4. A welding means comprising two or more electrodes adapted to the material of the object to be welded, an opening / closing means for opening and closing the electrodes, and a control means for selecting the electrode according to the material of the object to be welded at the welding point. The automatic resistance welding device according to any one of claims 1 to 3, which comprises. 5. A second storage means, an automatic resistance welding apparatus according to any one of claims 1 to 4 for storing a welding condition of the welding point and its. 6. A jig for placing an object to be welded, comprising second detecting means for detecting whether or not the object to be welded is placed on the jig. 6. The data in the second storage means is reset when it is removed from the tool.
The automatic resistance welding device according to any one of 1.