JPH0732161A - Manufacture of welding jig - Google Patents

Abstract

PURPOSE:To efficiently manufacture the welding jig suitable for workpiece by judging whether a standard welding jig is usable or not from working reference plane data of materials to be welded, welding gun data and standard welding jig data. CONSTITUTION:At the stage 11, the working reference plane data to show a weld zone peculiar to the workpieces three-dimensionally are prepared and these are inputted to a three-dimensional CAD and CAM system. At a stage 12, the standard welding jig data are called. At a stage 13, whether or not the standard welding jig is usable is judged from the standard welding jig data, the working reference plane data of the workpieces and the welding gun data. When this is usable, at a stage 14, an NC tape is prepared and working and assembling are carried out. When this is not usable, at a stage 18, the welding jig is designed automatically and the presence or absence of an interference is judged. When there is the interference, the stage is returned to the stage 18 and redesigned is carried out. When there is no interference, at the stage 14, the NC tape is prepared and working and assembling are carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used when welding an object to be welded such as an automobile body by a welding robot.
The present invention relates to a method for manufacturing a welding jig.

[0002]

2. Description of the Related Art When a plurality of members constituting an automobile body are automatically welded by a welding robot, a welding jig is used to position the plurality of members to be welded and prevent the relative positions of these members from being displaced. used. Various welding jigs are used depending on the shape and structure of the automobile body, the position of the welding portion, the type of welding gun used for welding the welding portion, and the like.

Of these welding jigs, a certain range of jigs are certified as standard welding jigs based on past usage records,
It is widely used as a welding jig for various automobile bodies.
However, since the shape and structure of the automobile body differs depending on the vehicle model, the standard welding jig cannot be used because of the interference between the welding gun and the welding jig depending on the position of the welding site and the type of welding gun used. There are cases. In such a case, a welding jig unique to the work to be welded must be designed. The suitability of welding jigs used for automobile bodies is
Conventionally, it is selected manually by a worker, and when a new welding jig is required, it is individually designed and manufactured.

[0004]

As described above, the selection and production of the welding jig is largely due to the manual work of the operator,
The work efficiency was not necessarily high. However, in recent years, there has been a demand for automation in this field as well.
There is an increasing desire to eliminate the manual work of workers as much as possible and to make the work easier. For example, Japanese Patent Laid-Open No. 2-2
No. 84885 discloses a work positioning device based on input position teaching data at a predetermined assembly position for a plurality of works that form a vehicle body or a main part of the vehicle body in order to facilitate the work for attaching the automobile body to a jig. There has been proposed a position teaching method for a work positioning device, in which a deviation value is obtained from measurement data and design data, and correction data is created from the deviation value to perform position teaching when performing positioning by the operation of.

Therefore, an object of the present invention is to provide a method for manufacturing a welding jig, which facilitates selection of the welding jig and facilitates designing and manufacturing of the welding jig.

[0006]

In order to achieve the above object, the present invention has the following configuration. That is, a standard welding jig can be used from processing reference plane data that three-dimensionally represents the welded part of the workpiece, data on a welding gun for welding the welded part, and data on a standard welding jig. If it is determined that the standard welding jig cannot be used, the position of the welding part, the model of the welding gun, and the approach direction of the welding gun to the welding part are determined. Considering the above, a step of designing a welding jig unique to the object to be welded, which does not hinder the welding work for the welding portion of the welding gun.

According to the welding jig manufacturing method of the present invention having such a configuration, the standard welding jig that can be used is selected, whether or not a new welding jig is necessary is determined, and new welding is performed. When a jig is required, its design and production can be systematically performed as a series of operations, and a welding jig suitable for each automobile body can be efficiently produced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a flow chart showing a welding jig manufacturing method of the present invention, and FIGS. 2 to 7 show a relationship between a welding gun and a welding jig when automatic welding is performed on an automobile body by a welding robot. FIG.

First, the relationship between the automobile body 1, the welding jig 2, and the welding gun 3 will be described with reference to FIGS. The vehicle body 1 is fixed to a predetermined position of the base plate 4 by a positioning jig (not shown), and is conveyed to the welding position of FIG. 2 while being fixed to the base plate 4. The points 1a, 1a, ... Described on the automobile body 1 in FIG. 2 indicate welded portions (the welding point positions of the welding gun 3). At the welding positions, welding robots 5 are arranged at positions corresponding to the four corners of the base plate 4, and the welding gun 3 is attached to the tip of the telescopic arm 5a of the welding robot 5.

As shown in FIGS. 3 to 5, the welding gun 3 includes various welding guns 6, 7 and 8 which can be selectively used depending on the welding site. The welding gun 6 is generally called a C-type gun, and is a type of welding gun that performs welding by sandwiching the welding portion of the automobile body 1 between the movable contact 6a and the fixed contact 6b. Further, the welding gun 7 is called a scissor type gun, and is a welding gun having welding contacts 7d and 7e at the tips of a pair of arms 7b and 7c that open and close around a fulcrum 7a. The welding gun 8 is a deformation type welding gun of the welding gun 6, and is the same as the welding gun 6 in that welding is performed by sandwiching the welding portion of the automobile body 1 between the fixed contact 8a and the movable contact 8b. However, in this welding gun 8, the C-shaped arm 8c that supports the fixed contact 8a is curved more largely than the C-shaped arm 6c of the welding gun 6, so that it can be adapted to a deeper welding site. However, the type of welding gun 3 is not limited to these welding guns 6, 7, and 8.

An automobile body 1 fixed to a base plate 4
Are assembled by integrally fixing a plurality of constituent members with a plurality of welding jigs 2, 2, ... As shown in FIGS. Then, the respective members constituting the automobile body 1 are integrated by joining the welded portion 1 a with the welding gun 3. The welded portion 1a is a welding position specific to the automobile body 1 which is determined by the shape and structure of the automobile body 1. Therefore, the welding site 1a cannot be moved according to the characteristics of the welding gun 3 and the performance of the welding robot 5. Therefore, when the welding jig 2 is arranged near the welding site 1a, depending on the model of the welding gun 3 and the performance of the welding robot 5, when the welding gun 3 approaches the welding site 1a, as shown in FIG. As shown, the welding gun 3 may interfere with the welding jig 2. If the welding gun 3 and the welding jig 2 interfere with each other, the welding gun 3 cannot reach the welding site 1a. In this case, it is necessary to change the shape and size of the welding jig 2. Note that FIG. 7 shows a case where the welding jig 2 and the welding gun 3 do not interfere with each other.

Therefore, in the present invention, a welding jig that can be used for the automobile body 1 is selected from the standard welding jigs through the steps shown in FIG. In the case where interference with 3 occurs, a new welding jig that enables welding with the welding gun 3 can be designed and manufactured.

The method of the present invention will be described below with reference to FIG. Starting at step 10, at step 11,
First, processing reference plane data that three-dimensionally represents a welded portion peculiar to the automobile body 1 is created, and this is used for three-dimensional CAD / CA
Input to the M system. Next, in step 12, the data regarding the standard welding jig is called, and from the data regarding this standard welding jig, the machining reference plane data of the automobile body 1 and the data regarding the welding gun used for welding the automobile body 1, At 13, it is determined whether the standard welding jig can be used. When the standard welding jig can be diverted, design data regarding the standard welding jig to be used is diverted to create an NC tape in step 14, whereby a drawing is drawn in step 15 and standard welding is performed in step 16. Process and assemble jigs.

If it is judged that the standard welding jig cannot be diverted, the standard attribute data unique to each base plate 4 is called in step 17, and based on this data, an appropriate welding jig is selected in step 18. Perform automatic editing design. Next, in step 19, the attribute data such as the position of the welded portion of the automobile body 1 (position of the welding point), the type of welding gun to be used, the approach direction of the welding gun during welding, etc. is called, and the welding designed in step 18 is performed. It is determined whether or not the jig and the welding gun interfere with each other. If no interference occurs, the new welding jig designed in step 18 is manufactured through steps 14, 15 and 16. If interference occurs, the process returns to step 18, and the design of the previously designed welding jig is changed. Hereinafter, similar steps are repeated.

[0015]

As described above, according to the method for manufacturing a welding jig of the present invention, the standard welding jig that can be used is selected, whether or not a new welding jig is necessary, and When a large welding jig is required, it can be systematically designed and manufactured as a series of operations, and a welding jig suitable for each automobile body can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a process chart showing a method for manufacturing a welding jig of the present invention.

FIG. 2 is a plan view showing a state in which an automobile body fixed to a bed plate is in a welding position.

FIG. 3 is a side view of an embodiment of a welding gun.

FIG. 4 is a side view of another embodiment of the welding gun.

FIG. 5 is a side view of still another embodiment of the welding gun.

FIG. 6 is a side view showing an interference state between a welding gun and a welding jig.

FIG. 7 is a side view showing a state in which the welding gun and the welding jig do not interfere with each other.

[Explanation of symbols]

 1 ... Automobile body 2 ... Welding jig 3 ... Welding gun 4 ... Base plate 5 ... Welding robot 6, 7, 8 ... Welding gun 1a ... Welding part (spotting position)

Claims (1)

[Claims] 1. A standard welding jig based on processing reference plane data that three-dimensionally represents a welded portion of an object to be welded, data on a welding gun for welding the welded portion, and data on a standard welding jig. The position of the welding part, the model of the welding gun and the approach of the welding gun to the welding part when the standard welding jig is judged to be unusable. Designing a welding jig specific to the workpiece, which does not interfere with the welding operation of the welding gun with respect to the welding portion while considering the direction. .