JPH1190643A - Inspection device for spot welding process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection device for a spot welding process capable of improving the efficiency of an inspecting operation and the reliability of the inspection. SOLUTION: In the case of spot-welding an automobile body 1 by plural spot welding machines 2 in plural welding processes, each of the spot machines is attached with an inspecting apparatus 3 for inspecting welding quality at the time of energization, also a backup process is continued to a last welding process to equip a backup spot- welding machine 2a. This spot welding process inspection device is provided with a defective data storing means 11 which, in the case that either of the inspecting apparatus 3 detects a defect, stores the defective data specifying the automobile body 1, spot welding machine 2 and the spot-welded position, with an alarm means 12 for raising an alarm at the point of time when a defective automobile body 1 is brought into the backup process and with a display means 13 which is installed side by side in the spot welding machine 2a, which graphically displays the shape of the automobile body part generating defectives by supplying the defective data from the defective data storing means 11, which instructs the defective spot-welded position in the graphic, and which displays the defective data in characters.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection apparatus for a spot welding process for inspecting the welding quality of each spot when performing spot welding with one or more spot welding machines in a plurality of welding processes. It is.

[0002]

2. Description of the Related Art Each spot welding machine in each welding process is provided with an inspection device for inspecting the quality of welding quality at the time of energization, and outputting a judgment result immediately after the energization. It is supposed to. As a result, the inspector rushes to temporarily stop the line after the end of the process, inserts a flap into the seam of the welded portion, specifies the defective spot position in a non-destructive state, and rewelds.

[0003]

Therefore, in such an inspection method, backup work efficiency is not good, and frequent periodic inspections including destructive inspections are indispensable from the viewpoint of reliability of the inspections, and defective data is also required. No accumulation had taken place.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an inspection apparatus for a spot welding process capable of improving the efficiency of inspection work and the reliability of inspection.

[0005]

According to the present invention, in order to achieve this object, according to the present invention, when spot-welding a workpiece with one or a plurality of spot welding machines in a plurality of welding steps, each of the hit points is determined. In the inspection equipment for spot welding process for inspecting welding quality, each spot welding machine is equipped with an inspection device for inspecting welding quality when energized, and the backup welding process is followed by the last welding process. When any of the inspection devices detects a defect, the defective data storage means for storing the defective work, the spot welding machine, and the defective data for specifying the position of the spot, and the defective work is backed up. Alarm means for issuing an alarm at the time of loading into the process Display means supplied from the storage means for displaying. The display means graphically displays the shape of the work part in which the defect has occurred, indicates the position of the defective point in the displayed figure, and displays the defect data. Is displayed in characters.

[0006] When the inspection device detects a defect, defect data for specifying the spot welding machine involved in the defect-producing work and the position of the defect spot is fetched and stored in the defect data storage means. At the time when the defective work is carried into the backup process, an alarm is issued by the alarm means, the shape of the defective work part is graphically displayed on the display means, and the position of the defective spot is indicated, and
Bad data is displayed in characters. The operator performs a backup operation using the backup spot welder according to the display.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An inspection apparatus for a spot welding process according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 partially shows a plurality of welding processes of an automobile body 1 as a workpiece, and each welding process is accompanied by one or more spot welding machines 2 (two in the illustrated process). At the end of the welding step, a backup step follows, and a backup spot welding machine 2a is prepared in the backup step area 9. The spot welding machine 2 usually performs a plurality of spots in the sharing area, detects the voltage and current value at the time of energization, estimates the nugget (weld portion) diameter by a calorific value calculation method, A well-known inspection device 3 for determining whether or not the thickness is appropriate is attached.

Each spot welding machine 2 has a welding control device 2b.
In addition, these welding control devices perform a plurality of spots in each welding area at a predetermined tact according to a command from the process control device 10. When the inspection device 3 detects a defect at the spot of the associated spot welding machine 2, the inspection device 3 sends a defect occurrence signal to that effect, and the welding control device 2b assigns a welding machine number, a process number, and a dot at the time of the defect detection. Send a number.

Reference numeral 19 denotes an inspection apparatus using a personal computer, which cooperates with an interface unit, a program memory, a readable and writable data memory, a CPU, and the like, and stores the defective data storage means 11 and the history data creation means of the present invention. 15 and history data storage means 16. That is, in order to constitute the failure data storage means 11, the spot welding machine 2 belonging to the corresponding spot welding machine 2 is transmitted in response to a failure occurrence signal which is transmitted when any of the inspection devices 3 detects a failure and can identify this inspection machine. , The work number being carried into the process at that time is fetched from the process control device 10, and the defect data for the defective work is sequentially updated in a data memory, for example, a hard disk. Store. Also, history data creation means 1
5, the failure occurrence data for each spot number of all spot welding machines 2 is sequentially updated for a predetermined operation time, for example, one month, based on the failure data stored in the failure data storage means 11. While storing the history data (see FIG. 3) on a hard disk as the history data storage means 16. Further, the personal computer 19 is provided with a CRT display unit 17 and a printer 18 for outputting history data and the like.

In the backup area 9 where the backup process is performed, a display unit 13 for displaying defective data and a personal computer 29 constituting the alarm unit 12 for alarming the occurrence of the error data are provided.
Is prepared. That is, each spot welding machine 2 in all processes
The graphic data for graphically displaying the partial shape of the vehicle body 1 in the hitting area assigned by the computer is stored, and the defective data transferred from the personal computer 19 is temporarily stored. When the process controller 10 instructs the carrying-in of the defective vehicle body 1 into the backup process, the beep sound is issued until the process is reset. In addition, it decodes the defect data, graphically displays the shape of the corresponding work part, indicates the position of the defective spot in the graphic, for example, by flashing, and sets the defect data of the welding process number, spot welder number and the dot number. Is displayed in characters.

The operation of the inspection apparatus for a spot welding process thus configured is as follows. The automobile body 1 is carried into the welding process, and welding is performed over a predetermined welding area shared by the associated spot welding machine 2 in each welding process. Each test point is judged to be good or bad by the associated inspection device 3, and when it is judged to be bad, the welding process number, the work number, the welding machine number and the test point number are taken into the fault data storage means 11 and temporarily stored. . At the same time, the failure data is transferred to the display means 13 and further the history data creation means 15
Are sequentially organized as history data and stored in the history data storage means 16.

When the defective automobile body 1 is carried into the backup area 9, the alarm means 12 issues an alarm and the display means 13 graphically displays the shape of the defective work part as shown in FIG. At the same time, the position of the hit point is indicated by blinking, and an instruction by characters is performed. The operator operates the associated spot welding machine 2a in accordance with the screen display, and strikes the designated spot again.

The display unit 17 and the printer 18 periodically output defect history data to check which spot position of the spot welding machine 2 has a high defect occurrence rate, and to maintain or spot the spot welding machine 2. It is used as information on the suitability of the position setting.

[0014]

According to the first aspect of the present invention, the backup operation for defective spots is performed in a dedicated process following the welding process without stopping the process each time, so that the backup operation is streamlined and the defective operation is improved. Since the data is displayed on the backup area in detail on the screen, backup errors are avoided, and the reliability of the backup is improved. Therefore, it is possible to eliminate the need for sampling, 100% inspection or destructive inspection, or to reduce the frequency.

According to the second aspect of the present invention, since the status of occurrence of defects at each spot can be ascertained, an abnormality of the spot welding machine can be found at an early stage, and the location of the spot at which the defect is likely to occur can be ascertained. It becomes possible. Therefore, it is possible to further improve the welding quality and further reduce the number of inspection steps by collectively managing the defect data of all the welding processes.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an inspection apparatus for a spot welding process according to an embodiment of the present invention.

FIG. 2 is a diagram showing a display state of a backup display unit of the inspection apparatus.

FIG. 3 is a diagram illustrating a format of history data created by the inspection apparatus.

[Explanation of symbols]

 2 spot welding machine 2a backup spot welding machine 3 inspection device 13 backup display means

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G05B 19/4061 G05B 19/405 M

Claims (2)

[Claims] 1. A spot welding process inspection apparatus for inspecting the welding quality of each spot when a workpiece is spot-welded by one or a plurality of spot welding machines in a plurality of welding processes. At the same time, an inspection device for inspecting the welding quality is attached, and a backup process is followed by a backup process after the last welding process. If any of the above-mentioned inspection devices detects a defect, this defect occurs. Defective data storage means for storing defective data specifying the work, the spot welding machine and the hitting position, alarm means for issuing an alarm when a defective work is carried into the backup step, and the backup spot Display means for juxtaposed with the welding machine and supplied with the defect data from the defect data storage means for display. The display means graphically displays the shape of the work part in which the defect has occurred, indicates the position of the defect in the displayed figure, and displays the defect data in characters. Process inspection equipment. 2. History data creating means for creating failure occurrence history data for a predetermined operation time for each spot of each spot welding machine from the failure data stored in the failure data storage means, and the created history data. 2. The inspection apparatus for spot welding process according to claim 1, further comprising: a history data storage unit for storing the inspection data.