JP2534090Y2 - Oscillating device for welding torch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillating device for vibrating a welding torch.

[0002]

2. Description of the Related Art An oscillatory device for vibrating a welding torch in an automatic welding apparatus for forming a welding bead on a member to be welded by feeding a member to be welded facing the welding torch in one direction and performing welding. Is provided, and is known as a so-called oscillating type welding apparatus. One type of the oscillating type welding device includes an oscillating device that reciprocally oscillates by moving a welding torch in a direction perpendicular to a feed direction of a member to be welded, for example, butting against a thick member to be welded. When welding is performed, a wide welding bead is formed in the groove along the feed direction in accordance with the swing width of the welding torch. The oscillating device usually has a drive motor that can be rotated in both forward and reverse directions, and the welding torch reciprocally oscillates via a timing belt, a feed screw, and the like as the drive motor rotates in both forward and reverse directions. It is configured to be.

[0003]

However, in the above-described oscillating device that vibrates the welding torch with the rotation of the drive motor in both the forward and reverse directions, it is necessary to change the rotation direction of the drive motor in a short cycle. Yes, it takes a long time for the number of revolutions to rise at the time of conversion, so the frequency of the welding torch cannot be increased so much. As a result, the feed speed of the member to be welded becomes slow, and sufficient welding efficiency cannot be obtained. In some cases, the variation in the build-up of the formed or wide weld bead in the feed direction in the above-mentioned feed direction becomes so large that the weld quality cannot be sufficiently obtained. Further, since the feed speed of the member to be welded cannot be increased, the amount of heat input is increased, and the properties of the member to be welded may be degraded, or it may be difficult to appropriately secure the welding quality of the weld bead.

The present invention has been made in view of the above circumstances, and aims at increasing the frequency of the welding torch and the relative feed speed between the workpiece and the welding torch. It is an object of the present invention to provide an oscillating device for a welding torch that can improve welding efficiency and welding quality of a weld bead and can appropriately prevent thermal deterioration of a member to be welded.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a method for welding a member to be welded by relatively sending at least one of the member to be welded and a welding torch. A welding torch oscillating device for reciprocating the welding torch at a predetermined cycle within a predetermined range in a direction perpendicular to the feed direction based on the rotation of the drive motor, and (a) the welding torch A torch holding member to which is mounted, (b) guide means for guiding the torch holding member movably in the reciprocating vibration direction, and (c) an eccentric portion at a position eccentric from a rotation axis, the drive A rotating drive shaft that is rotationally driven by a motor, and (d) operatively connecting the eccentric portion of the rotating drive shaft and the torch holding member, and rotating the eccentric portion in one direction by the torch holding member. Linear reciprocation And connection means for converting the

[0006]

In the oscillating device for a welding torch having such a configuration, when the rotary drive shaft is driven by the drive motor, the eccentric portion of the rotary drive shaft is rotated about the axis of the rotary drive shaft. The rotational movement in one direction of the eccentric portion is transmitted to the torch holding member via the connecting means, so that the rotational movement in one direction of the eccentric portion is linearly reciprocated by the torch holding member guided by the guide means. Accordingly, the welding torch mounted on the torch holding member is reciprocated at a predetermined cycle in a predetermined range in a direction perpendicular to the feed direction. As described above, according to the welding torch oscillating device of the present invention, the welding torch can be reciprocally oscillated by rotating the drive motor in one direction without rotating the drive motor in both the forward and reverse directions. Can be more suitably increased than before. Thereby, the relative feed speed between the member to be welded and the welding torch can be further increased to improve the welding efficiency, and the variation in the build-up in the feed direction of the formed wide weld bead can be reduced. Welding quality can be improved. In addition, since the feed speed can be increased, the heat input amount is reduced, so that deterioration of the properties of the member to be welded can be suitably prevented, and the welding quality of the weld bead can be appropriately secured. As a result, there is provided an oscillating device for a welding torch capable of improving welding efficiency and welding quality of a weld bead and suitably preventing thermal deterioration of a member to be welded.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 3 show an example of an oscillating apparatus for a welding torch according to the present invention. A driving motor 1 is mounted on a first support plate 12 erected on one end of an upper surface of a base 10. As shown in FIG.
4 is fixed. As the driving motor 14, a motor whose rotational speed can be adjusted is preferably used. A pulley 18 is attached to the output shaft 16 of the drive motor 14 projecting from the first support plate 12 so as not to rotate relatively. Between the second support plate 20 and the first support plate 12 erected at the end of the upper surface of the base 10 opposite to the first support plate 12 side, a bottomed cylindrical shape having a through hole at the bottom. The cylindrical member 22 is provided in a state where the movement in the axial direction and the direction perpendicular to the axial center are prevented by the member 21 and the like. A rotary drive shaft 24 is rotatably supported in the cylindrical member 22 via a pair of bearings 26 in a state parallel to the output shaft 16. A pulley 28 is attached to one end of the rotary drive shaft 24 protruding from the first support plate 12 and the cylindrical member 22 so as to be relatively non-rotatable. A timing belt 30 extends between the pulley 28 and the pulley 18. Have been. The other end of the rotary drive shaft 24 has an eccentric shaft 3 at a position eccentric from the axis of the rotary drive shaft 24 by a predetermined amount.
2 (see FIG. 4) are provided integrally, and the eccentric shaft 32 protrudes from the second support plate 20 and the cylindrical member 22. An eccentric shaft 32 is provided with a first connecting member 34 having an elliptical shape and a plate shape at one end side of a bearing 36.
It is attached so as to be relatively rotatable via. The amount of eccentricity e (see FIG. 4) of the eccentric shaft 32 with respect to the axis of the rotary drive shaft 24 is determined to be half the required swing width of the welding torch 68 described later.

On the other hand, the first support plate 1 of the second support plate 20
A pair of guide rods 38 that are parallel to the upper surface of the base 10 and parallel to each other at portions located on both sides of the eccentric shaft 32 in the direction approaching and separating from the base 10 on the surface opposite to the second side. , 40 are each a pair of support members 42, 42.
Respectively. A movable member 44 having a rectangular plate shape is slidably fitted to these guide rods 38 and 40 at leg portions 46 integrally provided at the four corners thereof.
Are guided along guide rods 38, 40.

At a substantially central portion of the movable member 44, a shaft portion 4 is provided.
8, a flange portion 50 provided on one end side of the shaft portion 48, and a protruding portion 52 protruding from the flange portion 50 to the side opposite to the shaft portion 48 side.
4 is fixed by a plurality of bolts 56 on the flange portion 50 in a state where the shaft portion 48 protrudes to the second support plate 20 side and the protruding portion 52 protrudes to the opposite side to the second support plate 20 side. The other end side of the first connecting member 34 is attached to the shaft portion 48 of the second connecting member 54 via a bearing 58 so as to be relatively rotatable, whereby the longitudinal direction of the first connecting member 34 is It is positioned substantially parallel to the guide rods 38,40.

A torch holding member 59 is attached to the projecting portion 52 of the second connecting portion 54. The torch holding member 59 includes a rod 60 and an attachment member 62 integrally fixed to one end of the rod 60, and the protrusion 52 of the second connecting member 54 The rod 60 has a key 66 in a through hole 64 provided at right angles to the upper surface.
The fitting member 6 is fitted in such a manner that relative rotation about the axis is prevented by the like and the fitting position in the longitudinal direction is adjustable by fixing means (not shown).
Inside 2, for example, a long welding torch 68 for arc welding is sandwiched and tightened by a pair of bolts 67, so as to be integrated with the rod 60 in parallel (at right angles to the upper surface of the base 10). Installed. As a result, the drive motor 14 is driven and the timing belt 30 is driven.
When the eccentric shaft 32 is rotated in one direction around the axis of the rotary drive shaft 24 by rotating the rotary drive shaft 24 through the first connection, the first connection is caused by the rotation of the eccentric shaft 32 in one direction. The member 34 is repeatedly reciprocated in the longitudinal direction while being swung about the shaft portion 48 side of the second connecting member 54 as a fulcrum, so that the movable member is provided via the first connecting member 34 and the second connecting member 54 and the like. While being guided by the guide 44 and the guide rods 38 and 40, the torch holding member 59 and the welding torch 68 are reciprocally oscillated with a swing width twice the eccentricity e. Therefore, in this embodiment, the eccentric shaft 32 serves as an eccentric part, the guide rods 38 and 40 and the movable member 44 serve as guide means, and the first connecting member 34 and the second connecting member 54 serve as connecting means. Make up. As shown in FIGS. 2 and 3, a predetermined amount of a welding wire 70 held by the welding torch 68 protrudes from the distal end (lower end). 1 to 3, the illustration of the welding wire 70 and the like on the upper end side of the welding torch 68 is omitted.

In the oscillating device for a welding torch constructed as described above, the welding wire 70 projecting from the welding torch 68 is brought close to, for example, a groove portion of a pair of members to be welded (not shown) butted against each other. In the state,
While the member to be welded is fed in one direction parallel to the rotary drive shaft 24, the drive motor 14 is driven in one direction at a constant rotation speed to move the welding torch 68 to the guide rod 3 as described above.
Arc welding is performed while reciprocating vibration in a direction parallel to 8,40. Thereby, for example, as shown by a dashed line in FIG. 5, a welding bead 72 having a relatively wide width W corresponding to the swing width of the welding torch 68 is formed in the groove portion along the feed direction of the member to be welded. Is done. In FIG. 5, the wavy line indicated by a solid line indicates the locus of the distal end of the welding wire 70 on the member to be welded when forming the wide welding bead 72 by the center line of the welding wire 70. Things.

As described above, according to the present embodiment, the rotation of the eccentric shaft 32 in one direction accompanying the rotation of the drive motor 14 in one direction is performed by the torch via the first connecting member 34 and the second connecting member 54 and the like. By being converted into the linear reciprocating motion of the holding portion 59 and thus the welding torch 68, the welding torch 68 is reciprocally oscillated with a swing width 2e in a direction perpendicular to the feed direction of the member to be welded, as in the conventional case. Since it is not necessary to rotate the drive motor in both the forward and reverse directions to reciprocate the welding torch, the frequency of the welding torch 68 can be further increased. FIG. 6 shows a welding torch 68
FIG. 4 is a diagram showing an example of the relationship between the swing width of the motor and the maximum allowable frequency.The solid line shows the relationship when the oscillation device of the present invention is used, and the dashed line shows the welding by rotating the drive motor in both forward and reverse directions. The relationship in the case where a conventional oscillating device for reciprocating the torch is used is shown, and a comparison is made using drive motors having the same output and mounting loads of a welding torch or the like being substantially the same. As can be seen from FIG. 6, in the oscillation device of the present embodiment, the frequency of the welding torch 68 can be greatly increased as compared with the conventional one, so that the feed speed of the member to be welded can be further increased. As the welding efficiency is improved, a wide weld bead 7 is formed.
Variations in the overlay in the feed direction of the workpiece 2 (vertical direction in FIG. 5) can be suitably reduced, and the welding quality is improved.

Further, according to the present embodiment, since the feed speed of the member to be welded can be increased, the amount of heat input is reduced, and the deterioration of the properties of the member to be welded due to penetration of the welding bead 72 is preferably prevented. In addition, the welding quality of the weld bead 72 can be suitably secured.

Also, according to the present embodiment, the welding torch 68
Even if the mounting load is substantially the same as the conventional one, the frequency of the welding torch 68 can be further increased using the drive motor 14 having the same output as the conventional one. In a good case, there is an advantage that the mounting load can be increased as compared with the conventional case.

In the above-described embodiment, the eccentric shaft 32
It is also possible to change the amount of eccentricity of the rotary drive shaft 24 from the axis so that the swing width of the welding torch 68 can be changed according to the member to be welded. In this case, specifically, for example, the eccentric shaft 32 is provided as a separate member from the rotary drive shaft 24, and a guide groove extending in the radial direction is provided on the end face of the rotary drive shaft 24, and the eccentric shaft is provided at the bottom of the guide groove. 32 is fixed by a bolt or the like so as to be position-adjustable along the guide groove.

In the above-described embodiment, the guide means is constituted by the guide rods 38, 40 and the movable member 44. However, the guide means is not necessarily required. For example, the movable member may be replaced with the guide rods 38, 40. 44 may be provided with a pair of guide grooves for fitting and guiding the same, or a guide groove for fitting a part of the shaft portion 48 of the second connecting member 54 to guide it. The guide means can be constituted by.

In the above-described embodiment, the welding torch 68
Is provided at a right angle to the upper surface of the base 10, but is not necessarily required. For example, it may be provided at a predetermined angle in the feed direction of the member to be welded. In this case, the inclination angle of the welding torch can be configured to be adjustable.

In the above embodiment, the welding torch 68
Is mounted at right angles to the upper surface of the base 10, and the base 1
The welding torch 68 is configured to be oscillated in a direction perpendicular to the upper surface of the base 10 by mounting the welding torch 68 in parallel with the upper surface of the base 10. Can also.

In the above embodiment, the welding torch 68
Is configured so that the member to be welded is sent in a fixed position.However, the member to be welded can be configured to send the welding torch with the position fixed, or both the welding torch and the member to be welded can be reversed. It can also be configured to send to.

In the above-described embodiment, a welding torch 68 for arc welding such as MIG welding using a welding wire 70 also serving as an electrode is attached to the oscillating apparatus. However, welding for TIG welding or plasma welding is performed. A torch can be attached.

In addition, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an oscillating device for a welding torch according to the present invention together with a welding torch, with a part cut away.

FIG. 2 is a view of the device of FIG.

FIG. 3 is a view taken in the direction of arrow B in FIG. 2;

4 is an enlarged view of the rotary drive shaft 24 of the apparatus of FIG. 1 as viewed from the movable member 44, and is a diagram showing an eccentric state of an eccentric shaft 32. FIG.

FIG. 5 is a view for explaining a wide welding bead formed by using the apparatus of FIG. 1;

6 is a diagram showing an example of a relationship between the swing width of the welding torch and the maximum frequency by the apparatus of FIG.

[Explanation of symbols]

Reference Signs List 14 drive motor 24 rotation drive shaft 32 eccentric shaft (eccentric portion) ｛34 first connecting member, 54 second connecting member｝ connecting means ｛38, 40 guide rod, 44 movable member｝ guide means 59 torch holding member 68 welding torch 72 Weld bead

Claims (1)

(57) [Scope of request for utility model registration] When a welding is performed on a member to be welded by relatively sending at least one of the member to be welded and a welding torch, a predetermined range in a direction perpendicular to a feeding direction based on rotation of a drive motor. A welding torch oscillating device for reciprocating the welding torch at a predetermined cycle within the torch holding member to which the welding torch is attached,
A guide means for guiding the torch holding member movably in the reciprocating vibration direction, a rotary drive shaft having an eccentric portion at a position eccentric from a rotary axis, and rotationally driven by the drive motor; Connecting means for operatively connecting the eccentric portion of the torch and the torch holding member, and converting a rotational movement of the eccentric portion in one direction into a linear reciprocating motion of the torch holding member. Oscillating device.