JPH0538584A - Clamp device for work - Google Patents

Abstract

PURPOSE:To improve the welding work efficiency to a work. CONSTITUTION:In the clamp device for a work for holding the work at the time of executing spot welding to plural parts by a welding means with respect to the work, this clamp device for a work is constituted by providing reference gages 11, 16 for holding continuously the work extending from the start to the end of a welding work to the work W on a base 10, providing main gages 12, 14 for holding the work only for a prescribed time to the work on the base so as to be freely movable vertically, and placing sub-gages 13, 15 for forming pairs with the main gages, and holding same work at the time when the main gages concerned are not holding the work, adjacently to the main gages 12, 14. In one stage, the welding work can be executed to many parts, therefore, the number of stages in an assembly line of a car body can be decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workpiece clamping device used for clamping a workpiece when a welding process is performed on an automobile body.

[0002]

2. Description of the Related Art As is well known, an assembly process of an automobile body includes a floor main process, a main body process, a metal line process and the like. The fluff main process is a process of integrally assembling the engine compartment and the front and rear floor panels, and the main body process is such that body side panels and roof panels are integrated with the floor main assembled in the floor main process. In the metal line process, a door panel, a hood panel, a trunk lid and the like are further assembled. Many of these processes are equipped with a welding robot on a stage forming each process, and spot welding work is performed at a predetermined position by the welding robot. Also,
For example, in the floor-main process, after joining the panel materials to each other in the temporary fixing stage on the upstream side of the many stages that make up this process, the additional welding work, that is, spot welding spots, is increased in the subsequent stages to increase the car body Work has been done to give a predetermined strength to the.

[0003]

When the predetermined work in each process is completed, the car body, which is a work, is simultaneously conveyed. Therefore, the work time is set within a certain range in each process. Therefore, for example, when a plurality of panel materials integrated in the temporary fixing stage are further subjected to spot welding work in a plurality of additional stamping steps, the number of strokes that can be welded in one additional stamping stage depends on the stage. It will be limited to a fixed time when the vehicle body can be stopped. If there is a limit to the number of spots that can be welded in one stage, the work needs to be performed in multiple stages. If the welding work is completed with few stages, not only can the line for body assembly be shortened,
The manufacturing work of the vehicle body will be done quickly and efficiently.

Therefore, various studies have been made in order to improve the welding work efficiency in one stage so that the welding work can be performed on a large number of places in one stage within a predetermined time. As a result, factors that impede rapid welding work in one stage include:
It was thought that the existence of a gauge, which is also referred to as a clamp material or a support post for holding the vehicle body as a work to be welded, is unavoidable. In other words, the welding work is performed by the welding robot while the vehicle body is supported by the gauges at each stage, but it is necessary to avoid interference between the robot and the support posts, so even if there is time, There was a limit to the number of RBIs on one stage. The present invention has been made in view of the above-mentioned problems of the prior art, and by performing welding work sequentially while letting out a gauge that interferes with a robot, a large number of places can be formed in a predetermined time in one stage. The purpose of the present invention is to improve welding work efficiency by enabling welding work.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a work clamping device for holding a work when spot welding is performed on a work at a plurality of locations by a welding means. A gauge for reference that keeps holding the work from the start to the end of welding work is provided, and a main gauge that holds the work only for a predetermined time with respect to the work is vertically movable on the base, and the main gauge is provided. And a sub-gauge that holds the work when the main gauge does not hold the work, and is arranged adjacent to the main gauge.

[0006]

In addition to the standard gauge for always holding the vehicle body, the pair of main gauge and sub gauge is provided. Therefore, when performing welding work on the vehicle body by the welding means, one of the main and sub means and the welding means If there is a possibility of interference with one another, retract one and hold the vehicle body with the gauge of the other. As a result, it becomes possible to perform the welding work of the vehicle body on a large number of places within a predetermined time in one stage.

[0007]

The present invention will be described in detail below with reference to an embodiment of the present invention shown in the drawings. FIG. 1 is a view showing one of the incremental striking stages constituting a floor main line of an automobile body assembly line. The base portion 10 provided on this stage is provided with a plurality of gauges 11 to 16 for supporting the vehicle body W which is a work. The vehicle body W is transported to a position above the base portion 10 by a transport device (not shown), and when the welding operation is completed, the vehicle device W is transported to the next stage. These gauges are
For example, at least four pieces are required to support the four corners of the vehicle body, but normally more gauges are used. For example, eight gauges may be used, four on each side of the vehicle body. In the case shown in the figure, six gauges 11 to 16 are provided on one side of the vehicle body, and a similar number of gauges are provided on the other side of the vehicle body, resulting in a total of 12 gauges. Is provided. In order to perform spot welding on the vehicle body W held by these gauges, welding robots 21 to 23 are provided in the base portion 10. Welding robots 21-23
Has a spot welding gun at its tip, and these are configured to move in the three axial directions of up, down, left, right, and front and back.

A gauge 1 for holding the front and rear ends of the vehicle body
Reference numerals 1 and 16 are reference gauges for holding the vehicle body W from the start to the end of the welding work by the welding robots 21 to 23. The gauges 11 and 16 shown are used to hold one side of the vehicle body.
In order to hold the other side of the vehicle body W corresponding to, a reference gauge (not shown) is provided. Two gauges 12,
13 form a pair, one is the main gauge 12, and the other is the sub gauge 13. Similarly, of the two gauges 14 and 15 forming a pair, one is the main gauge 14 and the other is the sub gauge 15. These main and sub gauges are configured to always hold the vehicle body W by at least one of the main and sub gauges. For example, in the case where the welding robot 21 welds a portion marked with a circle to the vehicle body W, when the welding robot 21 approaches the main gauge 12 in order to avoid interference between the welding robot 21 and the main gauge 12. The main gauge 12 descends as shown by the chain double-dashed line in the figure. At that time, a predetermined portion is held by the auxiliary gauge 13 provided adjacent to the main gauge 12. Further, for example, when the welding robot 22 welds a part marked with “X” in the figure, when the welding robot 22 approaches the sub gauge 13, in order to avoid interference between the sub gauge 13 and the welding robot 22, This sub gauge 13
Will fall. Similarly, when welding a portion where the welding robot 22 and the main gauge 14 interfere with each other, the main gauge 14 is lowered, and the sub gauges 1 adjacent to each other are paired.
5, the vehicle body is held. The same applies to the case where the welding robot 23 welds a portion marked with Δ in the drawing.

FIG. 2 is a view showing a work clamp device according to another embodiment of the present invention. In this case, the main gauge 31 and the sub gauge 32 are arranged in a pair in the vehicle width direction of the vehicle body W, and a pair is similarly formed on the other side of the pair gauges in the vehicle width direction. Main gauge 33 and sub gauge 3
4 and 4 are arranged. Also in this case, when the welding robot as the welding means interferes with one of the main and sub gauges, that gauge is retracted and the other gauge holds the vehicle body as in the above-described embodiment. Therefore, it is possible to perform the welding work on a large number of places within a fixed time in the additional punching stage shown in the figure, and it is possible to reduce the number of stages, that is, the number of each step constituting one line. As a result, the welding work efficiency can be significantly improved. In the illustrated embodiment, each of the main gauge and the sub gauge is formed by one gauge, but a plurality of gauges may constitute at least one of the main and sub gauges.

[0010]

According to the present invention, as a result of holding adjacent portions by at least one of the main and sub gauges,
The interference between the welding means and the gauge is avoided, and it becomes possible to weld a large number of points within a predetermined time by one welding means, and the welding work efficiency is improved. Further, since more points can be welded in one stage than in the conventional case, it is possible to reduce the number of stages in an assembly line of a vehicle body having a large number of stages. Has improved.

[Brief description of drawings]

FIG. 1 is a side view showing a workpiece clamping device according to an embodiment of the present invention,

FIG. 1 is a front view showing a work clamp device according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Base, 11, 16 ... Reference gauge, 12, 14,
31, 33 ... Main gauge, 13, 15, 32, 34 ... Sub gauge, 21-23 ... Welding robot.

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[Procedure amendment]

[Submission date] September 4, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a side view showing a workpiece clamping device according to an embodiment of the present invention,

FIG. 2 is a front view showing a workpiece clamping device according to another embodiment of the present invention.

[Explanation of Codes] 1 ... Base, 11, 16 ... Reference gauge, 12, 14,
31, 33 ... Main gauge, 13, 15, 32, 34 ... Sub gauge, 21-23 ... Welding robot.

Claims (1)

[Claims] 1. A clamp device for a work, which holds the work when spot welding is performed on a work at a plurality of locations by a welding means, a standard for continuously holding the work from the start to the end of the welding work on the work. And a main gauge that holds the work only for a predetermined time with respect to the work is movably provided on the base, and forms a pair with the main gauge, and the main gauge holds the work. A work clamp device in which a sub-gauge for holding the work when not present is arranged adjacent to the main gauge.