JPH049104Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a welding device used for spot welding, for example, automobile panel parts.

Conventional technology Generally, most of the panel parts used in automobiles etc. are joined by spot welding, but the spot welded parts of the panel parts change three-dimensionally due to the nature of the panel parts. Welding may be performed using a pre-taught spot welding robot.

Problems that the invention aims to solve Generally, welding robots have a boom supporting body on the base, and the boom is rotatably attached to this boom supporting body. Since a hydraulic device such as a pump generator is installed and the boom is long, there is a problem in that a large amount of installation space is required.

Therefore, welding robots cannot be used to perform accurate welding work in places where installation space is limited, and workers are required to have a high level of skill.

Therefore, the present invention provides a welding device that does not require operator skill even in a limited installation space and can provide welding accuracy comparable to that of a welding robot.

Means for Solving the Problems An X table is supported by a drive device on a frame installed near the workpiece so as to be slidable in the X-axis direction along the frame.
A table is supported so as to be slidable along the Y-axis direction in which the table approaches and leaves the frame, and a spline shaft in which a shaft extending in the Z-axis direction is inserted into the Y table is supported so as to be movable up and down. This welding device is equipped with a gun body that rotates around the Y-axis direction due to the vertical movement of the shaft, and the frame supports a Y cam plate that moves the Y table, and also rotates the spline shaft in the vertical direction. A Z cam plate is supported on the frame, and a θ cam plate is supported on the frame to move the shaft up and down and rotate the gun body.

Operation When the X table slides along the frame by the drive device, the Y table follows the Y cam plate, the spline shaft follows the Z cam plate, and the gun body is moved in the Y-axis direction and the Z-axis direction, respectively.
Furthermore, by moving the shaft up and down following the θ cam plate, the gun body is rotated, and spot welding is automatically performed along the workpiece shape.

Embodiment Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings.

FIG. 1 shows an overall exploded perspective view of a welding device 1 for spot welding, which is installed near a workpiece (not shown).

Reference numeral 2 in the figure indicates a frame, which is fixed to a jig for a work such as a suspension member, and is formed in a substantially U-shape.

A ball screw 3 is attached to the frame 2 in the longitudinal direction and an X rail 4 is attached thereto, and the ball screw 3 is connected to a motor 5.
Note that 2a indicates a mounting seat.

A drive device is composed of the motor 5, the ball screw 3, and a nut member to be described later.

The frame 2 has an X table 6 on the X rail 4, which is slidable in the X axis direction along the frame 2.
is supported, and this X-table 6 is screwed into the ball screw 3 via a nut member (not shown).

A Y-rail 7 is provided on the X-table 6 in the Y-axis direction toward and away from the frame 2, and a Y-table 8 is slidably supported on the Y-rail 7.

A cylindrical cam roller 9 is attached to the Y table 8, and a spline shaft 10 extending in the Z-axis direction is inserted into the cam roller 9 so as to be vertically movable, also passing through the X table 6.

An upper bracket 1 is attached to the upper end of the spline shaft 10.
A gun mounting seat 12 is attached to the gun mounting seat 12 through the
3 is installed.

Further, a shaft 1 is located inside the spline shaft 10.
4 is inserted vertically movably, the upper end of the shaft 14 passes through the upper bracket 11, and the upper end of the shaft 14 is inserted into the gun body 1.
It is rotatably attached to an arm 13b attached to a rotating shaft 13a of No. 3 via a pin 13c.

A lower bracket 15 is attached to the lower end of the spline shaft 10, and this lower bracket 1
A sub-spline 16 is inserted through 5 from the Y-axis direction.

And the shaft 1 in the spline shaft 10
4 is rotatably attached to an arm 17 provided on the sub-spline shaft 16 via a pin 17a.

Therefore, when the shaft 14 moves up and down via the arm 17 due to the rotation of the sub-spline shaft 16, the gun body 13 moves up and down via the arm 13b of the gun body 13.
will rotate.

In this way, by the X table 6, Y table 8, and spline shaft 10,
The gun body 13, which is freely movable in the Y-axis direction and the Z-axis direction, performs predetermined operations by means of a cam plate, etc., which will be described below.

That is, a sub-frame 2b provided at both ends of the frame 2 is provided with a mounting seat 2c facing the Z-axis direction and a mounting seat 2d facing the Y-axis direction. A Y cam plate 18 having a groove 18a corresponding to the displacement in the Y-axis direction is attached to the mounting seat 2d, and a Z cam plate 19 having a groove 19a similarly corresponding to the displacement in the Z-axis direction is attached to the mounting seat 2d.

The cam roller 9 is fitted into the groove 18a of the Y cam plate 18, and the cam roller 20 provided at the end of the sub-spline shaft 16 is fitted into the groove 19a of the Z cam plate 19. On the other hand, a θ cam plate 21 made by bending and molding a plate material is attached to the Z cam plate 19,
A guide body 23 at the tip of an arm 22 attached to the end of the sub-spline shaft 16 is locked.

That is, the sub-spline shaft 16 is rotated by the guide body 23 that slides along the θ cam plate 21, and the shaft is moved up and down, thereby rotating the gun body 13.

According to the structure of the above embodiment, when the ball screw 3 is rotated by the motor 5, the X table 6 slides along the frame 2 from the left side in the figure, for example.

Then, since the cam roller 9 smoothly rolls along the groove 18a of the Y cam plate 18, the gun body 13 is displaced in the Y-axis direction as set, and the cam roller 20 rolls along the groove 19a of the Z cam plate 19. As a result, the gun body 13 moves up and down in the Z-axis direction via the spline shaft 10 as set.

Further, the θ cam plate 21 allows the gun body 13 to freely rotate and follow changes in the welding surface of the workpiece, thereby preventing welding defects and improving product accuracy.

Therefore, Y, Z, θ cam plates 18, 19, 2, which are formed in advance to correspond to the welding portion of the workpiece,
1, it is possible to perform accurate welding work comparable to that of a welding robot in a small space and without requiring any level of skill.

In addition, for large workpieces, the above welding device 1
It is also excellent in that it has high versatility because it is sufficient to use a plurality of cam plates 18, 19, and 21, and it can easily be used for different workpieces.

Note that this invention is not limited to the above-mentioned embodiment, and the target work may be other than automobile parts. Alternatively, the θ cam plate 21 may be provided independently to directly move the shaft 14 up and down.

Effects of the invention As explained above, according to this invention, the gun body can be freely moved in the X-axis direction, Y-axis direction, and Z-axis direction by the X table, Y table, and spline shaft. Therefore, even if the installation space is limited, the operator does not need to be highly skilled, and the welding accuracy comparable to that of a welding robot can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an overall exploded perspective view. 1... Welding device, 2... Frame, 3... Ball screw (drive device), 5... Motor (drive device),
6...X table, 8...Y table, 10...
Spline shaft, 13...gun body, 14...shaft, 18...Y cam plate, 19...Z cam plate, 21...θ cam plate.

Claims (1)

[Scope of utility model registration request] An X table is supported by a drive device on a frame installed near the workpiece so as to be slidable in the X-axis direction along the frame.
A table is supported so as to be slidable along the Y-axis direction in which the table approaches and leaves the frame, and a spline shaft in which a shaft extending in the Z-axis direction is inserted into the Y table is supported so as to be movable up and down. This welding device is equipped with a gun body that rotates around the Y-axis direction due to the vertical movement of the shaft, and the frame supports a Y cam plate that moves the Y table and also rotates the spline shaft in the vertical direction. A welding device characterized in that a Z cam plate to be moved is supported, and a θ cam plate to move the shaft up and down and rotate a gun body is supported on the frame.