JPH10128584A - Welding jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce defective welds by setting the direction of the biasing force of an elastic body to be orthogonal to a butted part of a member to be welded to sufficiently release the welding heat during the welding. SOLUTION: A welding jig 20 is provided with an upper die 25 fitted to a bracket 24 and a lower die 22 provided on a jig base 21, a butted part of a member 2 to be welded is loaded on the lower die 22, and the upper die 25 is pressed toward the lower die to hold the member 2 to be welded. Receiving parts 29a-29c of the upper die 25 are provided on the bracket 24, the upper die 25 is split into a plurality of pieces, and the upper dies 25a-25c are slidably fitted to the bracket 24. An elastic body 32 is elastically fitted between the upper die 25c of the butted part of the member 2 to be welded extending in the direction parallel to or approximately parallel to the pressing direction out of the split upper dies 25a-25c, and its receiving part 29c, and the direction of the energizing the elastic body 32 is orthogonal to the butted part of the member 2 to be welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a welding jig, and more particularly to a welding jig for joining a half-split material such as a fuel tank for a motorcycle.

[0002]

2. Description of the Related Art A fuel tank 1 for a motorcycle as shown in FIG. 3, for example, is obtained by butt-butting a metal plate press material (work), which is a half-split member to be welded, and welding the butt portion. As shown in FIG. 4, the fuel tank 1 is formed by joining an outer tank 2 and an inner tank 3 at the lowermost portion of the tank 1. The outer tank 2 further includes a half-split outer left 2L. The outer light 2R is formed by butting against the outer light 2R and welding the butted portion.

[0005] The welding of the butt portion is often performed using a welding jig 4 as shown in FIGS. 5 and 6, for example. The welding jig 4 is mainly composed of a lower die 6 provided on a jig base 5 and an upper die 9 provided below a press plate 7 via a bracket 8. 6
Has a shape following the butted portion of the work 2, in this case, the outer tank 2.

[0004] Then, the butting portion of the half-shaped work 2 is placed on the lower mold 6, and the upper mold 9 is pressed toward the lower mold 6 from above to hold the work 2, and is provided on the press plate 7. A welding torch (not shown) is inserted from the working hole 10 to weld the butted portion.

[0005] A shim 12 is interposed between the receiving portion 11 of the upper die 9 provided on the bracket 8 and the upper die 9 as necessary to compensate for insufficient holding of the work 2.

[0006]

However, since the pressing direction on the upper die is a direction orthogonal to the jig base, the butting portion extending perpendicular to the jig base, that is, in a direction parallel to or close to the pressing direction. In FIG. 5, a sufficient pressing force is not applied to a portion A surrounded by a circle. Further, even if a shim is used as described above, insufficient holding of the work cannot be sufficiently compensated.

Since the lower die also serves as a cooling bracket, if the press force is insufficient and the contact between the work and the lower die becomes insufficient, the welding heat will not be sufficiently released, and poor welding such as perforation and pinholes will occur. Cause

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a welding jig that reduces welding defects.

[0009]

In order to solve the above-mentioned problems, a welding jig according to the present invention has an upper die attached to a bracket and a jig base. A lower die provided, and a butt portion of a member to be welded (work) is placed on the lower die, and the upper die is pressed from above toward the lower die to hold the member to be welded. In the welding jig configured as described above, the bracket is provided with the receiving portion of the upper mold, the upper mold is divided into a plurality of parts, and these upper molds are slidably attached to the bracket, and the divided parts are divided. An elastic body such as a coil spring is elastically mounted between the upper die of the butt portion of the member to be welded extending in a direction parallel to or close to the pressing direction of the upper die and its receiving portion, and the urging force of the elastic body is provided. The direction of the member to be welded It is obtained by the orthogonal to the abutting portion.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a welding jig to which the present invention is applied, and FIG. 2 is a sectional view taken along line II-II of FIG. The welding jig 20 is for butting a half-split metal plate press material and welding the butted portion. In the present embodiment, for example, a fuel tank 1 for a motorcycle as shown in FIG. The manufacturing jig will be described as an example of the welding jig 20.

This fuel tank 1 is, as shown in FIG.
The outer tank 2 and the inner tank 3 are joined at the lowermost portion of the tank 1, and the outer tank 2 (hereinafter referred to as “workpiece”) as a member to be welded is further formed of a half-split metal plate press material. It is formed by abutting the left 2L and the outer right 2R and welding the butted portion.

The welding jig 20 is mainly composed of a lower die 22 provided on a jig base 21 and an upper die 25 provided below a press plate 23 via a bracket 24. The surface facing the lower mold 22 is configured to follow the butted portion of the work 2. The upper mold 25 and the lower mold 22 are both formed of, for example, chromium copper (CuCr). In particular, the lower mold 22 also serves as a cooling metal at the time of welding.

Then, the butted portion of the half-shaped work 2 is placed on the lower mold 22 and the upper mold 25 is pressed from above toward the lower mold 22 to hold the work 2.
3, a welding torch (not shown) is inserted from a work hole 26 provided in the work piece 3 to weld the butt portion.

Since the pressing direction applied to the upper die 25 is a direction orthogonal to the jig base 21, the workpiece 2 extending perpendicular to the jig base 21, that is, parallel to or close to the pressing direction. Part, Figure 1
, A sufficient pressing force is not applied to the portion B surrounded by the circle.

Therefore, the upper mold 25 is first provided with a plurality of upper molds 25 in order to easily conform to the complicated curved surface shape of the work 2.
In the present embodiment, it is divided into three. In addition, the divided upper mold 25 is a first upper mold 2 from the left side of FIG.
5a, a second upper mold 25b and a third upper mold 25c.

Each of the upper dies 25a to 25c is, for example, a bolt 27
To the bracket 24. The bolt hole 28 formed in the bracket 24 is formed, for example, in the jig base 2.
1, an upper die having an abutting portion of the work 2 extending at an angle relatively parallel to the first die, in this embodiment, a first upper die 25
Regarding those of a and the second upper mold 25b, the elongated holes extend in parallel with the pressing direction, that is, in the direction orthogonal to the jig base 21. In addition, for example, the upper die having the butting portion of the work 2 extending at a relatively close angle to the jig base 21, in this embodiment, the bolt hole 28 of the third upper die 25c is orthogonal to the butting portion of the work 2. It is a long hole extending in the direction.

Each of the upper dies 25a to 25c is attached to the bracket 24 by tightening a bolt 27 without looseness so as to be slidable in the longitudinal direction of the bolt hole 28 which is a long hole.

Further, each upper mold 25a is attached to the bracket 24.
The receiving portions 29 to 25c are attached with, for example, bolts 30. These receiving portions 29 are used when the upper mold 25 is pressed.
The first and second receiving portions 29a and 29b and the first and second upper dies 25a and 2
The pressing force of these upper dies 25a and 25b is supplemented by interposing a shim 31 between the upper molds 5a and 5b as necessary.

On the other hand, in the third upper mold 25c, the shim 31 is used.
Instead, an elastic body such as a coil spring 32 is elastically mounted between the third receiving portion 29c and the third upper die 25c. Specifically, a recess 33 for inserting a spring is formed in the third receiving portion 29, and the coil spring 32 is mounted in the recess 33 in a compressed state. In addition, coil spring 3
2 is arranged at a position where the direction of the biasing force is orthogonal to the butted portion of the work 2.

Note that an air cylinder (not shown) or the like may be used instead of using an elastic body such as the spring 32 to obtain a biasing force orthogonal to the butted portion of the work 2.

The upper die 25 is divided into a plurality of pieces in accordance with the complicated curved surface shape of the work 2, and the upper die of the butted portion of the work 2 extending in a direction orthogonal to or close to the jig base 21. In the form, the third upper mold 25c
An elastic body such as a coil spring 32 is elastically mounted between the receiving portion 29 provided on the bracket 24 and the third receiving portion 29c in the present embodiment, and the direction of the urging force is adjusted by the butting portion of the work 2. When the upper die 25 is pressed, insufficient pressing of the work 2 can be sufficiently compensated for. As a result, the contact between the work 2 and the lower mold 22, that is, the degree of adhesion is improved, the welding heat at the time of welding can be sufficiently released through the lower mold 22, and the occurrence of welding defects such as perforations and pinholes is reduced. it can.

Further, since the structure is relatively simple and can be easily applied to conventional models, the increase in cost can be suppressed.

In the above embodiment, the outer tank 2 of the fuel tank 1 for a motorcycle is used as an example of the half-split metal plate press material (work). It can be applied to welding of butt portions of materials.

[0025]

As described above, the welding jig according to the present invention has an upper die attached to a bracket and a lower die provided on a jig base. In the welding jig configured to place the butted portion of the member to be welded (work) on the upper surface and press the upper die from above toward the lower die to hold the member to be welded, A receiving portion of the mold is provided, and the upper mold is divided into a plurality of parts, and these upper molds are slidably attached to the bracket, while the divided upper molds are parallel to the pressing direction or in a direction close to the pressing direction. An elastic body such as a coil spring is elastically mounted between the upper die of the butt portion of the welded member and the receiving portion, and the direction of the urging force of the elastic body is made orthogonal to the butt portion of the welded member. , Welding during welding Can escape sufficiently, it is possible to reduce welding defects.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a welding jig according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a side view of a fuel tank for a motorcycle.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a side view of a conventional welding jig.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 motorcycle fuel tank 2 work (outer tank, welded member) 20 welding jig 21 jig base 22 lower die 24 bracket 25 upper die 25a first upper die 25b second upper die 25c third upper die 29 receiving part 29a first receiving portion 29b second receiving portion 29c third receiving portion 31 shim 32 coil spring (elastic body)

Claims (1)

[Claims] 1. An upper die attached to a bracket, and a lower die provided on a jig base, a butt portion of a member to be welded is placed on the lower die, and the upper die is placed on the lower die from above. In a welding jig configured to hold the member to be welded by pressing toward a lower mold, the bracket 24 is provided with a receiving portion 29 of the upper mold 25, and the upper mold 25 is divided into a plurality. Divide the upper molds 25a to 25c
Is slidably attached to the bracket 24, and the welded member 2 extending in a direction parallel to or close to the pressing direction among the divided upper dies 25a to 25c.
The elastic body 32 is elastically mounted between the upper die 25c of the butted portion and the receiving portion 29c, and the direction of the urging force of the elastic body 32 is orthogonal to the butted portion of the member to be welded 2. Welding jig.