JP3402929B2 - Seam welding line copying machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a seam welding line copying apparatus, and more particularly, to a method of performing seam welding when sandwiching a peripheral portion of a fuel tank between a pair of upper and lower electrode wheels. The present invention relates to a welding line copying apparatus that corrects a welding trajectory of an electrode wheel at a peripheral portion of a fuel tank by horizontally turning the fuel tank while supporting the tank horizontally in a no-load floating state. 2. Description of the Related Art Conventionally, seam welding of a small number of fuel tanks or the like is performed manually by two workers, an operator A holding a fuel tank and an operator B operating a seam welding machine. Was. Worker A is in charge of checking the welding line and turning or moving the fuel tank while holding the fuel tank. Worker B is turning / stopping the electrode wheel, pressurizing / opening, and turning ON / O the power supply.
In charge of FF. [0003] The conventional seam welding operation requires at least two persons, and the worker A is in a posture holding a fuel tank and carefully observing a welding line.
The very difficult task of properly turning or moving the fuel tank so that the weld line is correctly formed is forced. [0004] It is an object of the present invention to provide a welding line copying apparatus in which one operator can relatively easily perform seam welding. [0005] The welding line copying apparatus of the present invention focuses on the fact that it is possible to control the welding line direction by the electrode wheels by adjusting the turning of the fuel tank in the horizontal direction. The principle will be described with reference to FIGS. FIG. 1 shows an XY table 50 in which three horizontal plates 48a to 48c are vertically stacked, and the first and second plates 4 from the bottom.
8a and 48b, and between the second and third plates 48b and 48c from below, the linear motion guides 52 and 54, respectively.
Are arranged. The linear motion guides 52 and 54 allow the plates 48a to 48c to slide in a linear direction, and the lower linear motion guide 52 and the upper linear motion guide 54 are disposed orthogonal to each other. That is, the lower linear guide 52 is an X-directional linear guide, and the upper linear guide 54 is a Y-directional linear guide. [0006] A copying control shaft 56 is provided on the upper or lower surface of the XY table 50. In FIG. 2, the XY table 5
It is assumed that the scanning control shaft 56 is provided on the lower surface of the zero.
The scanning control shaft 56 can be rotated manually, or can be rotated by a motor whose rotation angle can be controlled, such as a step motor or a servo motor. And this control shaft 5
It is assumed that a work 58 to be welded on which two sheet metals are stacked is supported at the lower end of the workpiece 6. In such a state that the workpiece 58 is supported, the peripheral edge of the workpiece (corresponding to the peripheral flange of the fuel tank) is sandwiched between the electrode wheels 46, and the electrode wheel 46 is rotated to seam weld the peripheral edge of the workpiece. At this time, when the scanning control shaft 56 is rotated in either the forward or reverse direction, the direction of the workpiece 58 with respect to the electrode wheel 46 changes. When this is viewed from the electrode wheel 46 side, the traveling direction of the electrode wheel 46 has changed. FIG. 3 shows an example of the relationship between the rotation direction of the scanning control shaft 56 and the traveling direction of the electrode wheel 46. When the electrode wheel 46 is traveling along the linear portion of the peripheral portion of the workpiece 58 to be welded (see FIG. When the control axis is rotated clockwise in accordance with the point A), the electrode wheel 46 is shifted inside the workpiece 58 to be advanced. When the electrode wheel 46 approaches the corner (point B in FIG. 3), and the scanning control shaft 56 is rotated clockwise by 90 °, the electrode wheel 46 makes a curve at 90 ° to the left in the traveling direction. . This is the control principle of the welding line of the present invention. Although the conventional fuel tank 2 is supported by a horizontally movable supporting device called an iron man, the iron man cannot support the rotational reaction force of the scanning control shaft 56. The XY table 50 as described above or a supporting means having a function equivalent thereto is required. By arranging various known link mechanisms and universal joints between the plates 48a to 48c, it is possible to realize a configuration in which the work is supported movably in the horizontal direction while supporting the rotational reaction force as in the XY table 50. It is. The above-described control of the welding line can be easily understood by imagining the work of feeding a fabric by a sewing machine. The feed direction of the sewing machine is always straight, but the stitch direction is changed by turning the fabric horizontally and changing the angle of the fabric fed to the needle. The XY table according to the present invention provides a slip between the sewing machine table and the cloth at this time. Further, the function of the hand for turning the fabric corresponds to the copying control axis of the present invention. The welding line tracing control device of the present invention is an application of the above-described welding line control principle, and is applied to the periphery of a workpiece.
When seam welding is performed with the edge sandwiched between a pair of upper and lower electrode wheels
Correction of the welding locus of the electrode wheel at the periphery of the workpiece
In a copying apparatus that performs horizontal turning adjustment, a support table on which a work is mounted and an XY table on which the support table is mounted are provided.
The first linear motion guide and the second linear
Two linear guides are arranged orthogonal to each other and
Arbitrary horizontal movement with horizontal swivel movement restricted
The XY table , a rotatable scanning control shaft supported on the base floor with the XY table supported at the upper end, and an operation member for manually rotating the scanning control shaft. A seam welding operation using the welding line scanning control device is performed as follows. First, a seam welding portion of a work on a support base is sandwiched between a pair of upper and lower electrode wheels of a seam welding machine. In this state, seam welding is started by energizing the electrode wheels while rotating the electrode wheels. The work is fed in the horizontal direction by the rotation of the electrode wheel. At this time, if the scanning control shaft is not rotated, the feed direction of the workpiece is a linear direction that always coincides with the tangential direction of the electrode wheel, and the seam welding line is basically a straight line except for errors. If the seam welding line deviates from the normal locus due to a variation in the thickness of the welded portion of the work, abrasion of the electrode ring, or friction of the support means, the operator visually checks the seam welding line and checks the welding line. In order to correct the deviation, the scanning control shaft is rotationally adjusted in a predetermined direction. Thereby, the traveling direction of the electrode wheel with respect to the workpiece is corrected, and a correct welding line is obtained. Further, at the place where the seam welding line of the work is curved, the scanning control shaft is gradually rotated in a predetermined direction while carefully checking the running position of the electrode wheel. This results in a curved weld line. For example, when a 90 ° arc welding line is formed at a corner of a work, the copying control shaft is slowly rotated by 90 ° at a substantially constant speed. In general, when the scanning control shaft is rotated, the support of the work not only makes a horizontal turning movement but also moves in the X and Y directions. However, since the support means permits the horizontal movement of the support, the electrode is moved. No excessive force acts on the wheel and the scanning control shaft. FIG. 4 shows an embodiment of the present invention.
It will be described based on. In the figure, reference numeral 44 denotes a seam welding machine, and a pair of upper and lower electrode wheels 46, 46 are disposed on the front surface of the seam welding machine 44. In front of the seam welding machine 44, a board 74 fixed by bolts 72 to a base floor surface 70 is installed, and a copying control shaft 78 integrally having a toothed pulley 76 on the board 74 is rotated with its axis vertical. It is arranged freely. An XY table 50 constituted by mutually independent three-layer plates is mounted on the upper end of the scanning control shaft 78. The XY table 50 is the same as that described in FIG. On the XY table 50, a dedicated jig 6 for supporting the fuel tank 2 is provided. This special jig 6
Has a plurality of claw portions 6a fixed to the upper surface thereof.
The support of the lower portion of the fuel tank 2 as a work enables the fuel tank 2 to be positioned and fixed at a fixed position. On the side of the substrate 74, a handle shaft 80 is erected on the base floor 70 so as to be rotatable. A toothed pulley 82 is fixed to the lower end of the handle shaft 80, and a toothed belt 84 is looped between the toothed pulley 82 and the toothed pulley 76 fixed to the copying control shaft 78. A handle 86 as a ring-shaped operation member is attached to the upper end of the handle shaft 80, and the operator C
Is rotated, the scanning control shaft 78 rotates in the same direction. The seam welding line copying apparatus is configured as described above, and the peripheral flange 4 of the fuel tank 2 is
The electrode wheel 46 is rotated while being sandwiched between the
The peripheral flange portion 4 is continuously resistance-welded by applying a current between the first and second peripheral portions 6 and 46. The operator C visually checks the trajectory of the welding line, and when the welding line is likely to deviate from the normal trajectory, rotates the handle 86 to the right or left by a predetermined amount to correct the deviation of the welding line. In particular, the welding line is formed at the corner R of the fuel tank 2.
When passing through, the handle 86 is quickly operated so that an arc-shaped welding line can be accurately formed. Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be variously modified. For example, in the above embodiment, the handle shaft 8
Although the zero and the scanning control shaft 78 are connected by the toothed belt 84, they may be connected by a chain or a gear. As described above, according to the present invention, the welding line can be easily controlled only by rotating the scanning control shaft, so that even one operator can operate the seam welding machine and copy the welding line. Work can be performed concurrently, and the work load per worker can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an XY table. FIG. 2 is a perspective view showing a relationship between a welding wheel and a scanning control shaft. FIG. 3 is a plan view of a workpiece showing welding line copying control. FIG. 4 is a perspective view of a seam welding line copying apparatus according to an embodiment of the present invention. [Description of Signs] 76, 82 Toothed pulley 78 Copying control shaft 80 Handle shaft 84 Toothed belt 86 Handle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23K 11/06 B23K 11/24

Claims (1)

(57) [Claims 1] A peripheral portion of a work is sandwiched between a pair of upper and lower electrode wheels.
Of the electrode ring at the periphery of the workpiece when seam welding
Copying equipment that corrects the welding trajectory by adjusting the horizontal rotation of the work
And a XY table on which the work is placed, and an XY table on which the support is placed.
The first linear guide and the second linear guide are perpendicular to each other in the gap.
And restricts the movement of the work in the horizontal turning direction.
An XY table that allows movement in an arbitrary horizontal direction in a state, a rotatable scanning control axis supported on the upper end of the XY table , and a rotatable scanning control axis; hand
A seam welding line copying apparatus comprising: an operating member that is rotated by motion .