JPH0123673Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a welding jig for welding multiple elongated materials in the longitudinal direction into an integrated elongated product, and in particular, the invention relates to a welding jig for welding a plurality of elongated materials in the longitudinal direction to form an integrated elongated product. The present invention relates to a welding jig that holds a long material while applying reverse strain to cancel it out.

PRIOR ART The side members of the ladder frame structure of automobiles (mainly trucks) usually have a length of 4 meters or more, and such side members are made into welded structures with a box-shaped cross section by welding. It is often said that For example, an inner rail with a narrower U-shaped cross section is fitted inside an outer rail with a U-shaped cross section facing each other, and then welded along the longitudinal direction at the fitted part of the two. It is made by

However, considerable welding distortion occurs in the side member product obtained by such welding, which appears as warpage in the longitudinal direction. Therefore, conventionally, in the pre-welding process, reverse strain is applied to both the outer and inner rail materials, which are long materials, using a hydraulic press or the like to eliminate the welding strain.
After that, welding is performed to check whether the welding strain has actually been canceled out, and the amount of reverse strain that should be applied at the stage before welding is adjusted accordingly, but there is a lot of variation, and the dimensional accuracy of the product is poor. Each time, the result was different, and it was therefore necessary to correct the welded finished product (side member) again by press working or the like.

The above-mentioned complication of causing reverse distortion does not only occur when the side members of an automobile frame are made by welding, but generally when multiple long materials are welded together in the longitudinal direction. The same can be said in the case of long products.

Purpose of the invention With this background in mind, the present invention eliminates the need for the troublesome and uncertain application of reverse strain in the pre-welding stage.
The purpose of this invention is to provide a welding jig that can simultaneously apply appropriate reverse strain when positioning a long material during welding.

Structure of the invention The welding jig according to the invention is designed to weld a plurality of long materials as described above into an integrated long product by welding them along the longitudinal direction. Three or more pieces are arranged on a base along the same line, and the long material is clamped at three or more locations spaced apart in the longitudinal direction, and the long material is given a reverse strain to cancel out the welding strain. It is a welding jig that can be held.

More specifically, (a) a first jig member fixed to the base and provided with a first clamp whose position in the direction in which the reverse strain is to be applied is adjustable;
The first jig member is attached to the first jig member so as to be rotatable between an open position and a clamp position in a plane substantially perpendicular to the longitudinal direction of the elongated material, and the reverse strainer is attached to a position facing the first clamp member. a second clamping tool whose position in the direction in which it is to be applied is adjustable; and in the open position, the elongated material is allowed to be supplied between the first jig member and the first clamping tool in the clamping position. (c) a second jig member that clamps the elongated material by sandwiching it from both sides between the first clamp tool and the second clamp tool; and (c) the first clamp tool and the second clamp tool can give an appropriate amount of reverse strain. and a drive mechanism that rotates the second jig member toward the clamp position using a force that overcomes the elastic force of the elongated material and holds the second jig member at the clamp position. It is.

Effect of the invention The welding jig including the first jig member, the second jig member, and the drive mechanism as described above has three or more welding jigs arranged on the base along the longitudinal direction of the long material. be done. Then, with the second jig member rotated to the open position, a long material is supplied between the second jig member and the first jig member, and then the second jig member is moved to the drive mechanism. By rotating the long material to the clamp position against the elastic force of the long material, welding can be performed while positioning during welding and at the same time applying a reverse strain to cancel the welding strain. Therefore, the conventional process of separately applying reverse strain before welding can be eliminated, making it possible to reduce equipment and man-hours.

Moreover, since the respective positions of the first clamp tool and the second clamp tool for clamping the long material can be adjusted in the direction in which reverse strain should be applied, it is easy to adjust the dimensional accuracy of the welded finished product. High precision long welded products can be obtained.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

The welding jig to be described is used to weld the side members of the ladder frame of the truck, and the side members have, for example, the front shape shown in FIG.
Further, as shown in the plan view of FIG. 2, it has an elongated shape, and actually has a length of 4 meters to 5 meters. Moreover, as is clear from FIG. 3, the combination of two long materials, the outer rail 4 and the inner rail 6 (hereinafter referred to as a long work), is moved along the longitudinal direction of the fitting portion of the two. It is obtained by welding, and below, the dimension in the W direction in Fig. 3 will be referred to as the width dimension.
Further, the dimension in the H direction is defined as the height dimension.

If no precautions are taken when welding as described above, welding distortion will occur particularly in the W direction, as conceptually shown in Figure 4, and the largest welding distortion C will occur at both arched ends. will occur. In order to solve this problem, the welding jig described below holds the long workpiece in a state in which a reverse strain is applied in the opposite direction to the direction in which the welding strain occurs, in order to cancel out the welding strain. In Figure 2, there are five locations along the longitudinal direction of the long workpiece (a,
b,...e).

One of them is shown in FIG. Further, a plan view thereof is shown in FIG. 6, a front view is shown in FIG. 7, and an exploded perspective view is shown in FIG. 8.

As shown in FIG. 5, this welding jig 10 includes a lower jig 12 as a first jig member and a top jig 14 as a second jig member. The lower jig 12 is integrally provided with a substrate 16 at its bottom, and is supported on a base 18 by the substrate 16. A pair of guide rails 20 are fixed to a base 18 on both sides of the substrate 16, and the lower jig 12 slides along these guide rails 20 in a horizontal direction perpendicular to the longitudinal direction of the long work. However, as is clear from FIG. 6, it is fixed to the base 18 by a lock bolt 24 that is tightened to the base 18 through a pair of elongated holes 22 formed in the base plate 16.

Also, as is clear from Fig. 7, the lower jig 1
Two position adjustment bolts 26 are provided to sandwich the bracket 2 from the slidable direction, and are screwed into screw holes formed in a bracket 28 fixed to the base 18, respectively. Therefore, the lock bolt 24
With the position adjustment bolts 26 loosened, if one of these position adjustment bolts 26 is screwed forward and the other is screwed back, the lower jig 12
can be adjusted along the guide rail 20 within the range of the elongated hole 22, and the position of each position adjustment bolt 26 relative to the bracket 28 is fixed by a lock nut 30, respectively. A position adjustment device that adjusts the position of the lower jig 12 in the horizontal direction is composed mainly of these position adjustment bolts 26 .

A positioning groove 32 having a rectangular cross section is formed in the upper part of the lower jig 12 along the longitudinal direction of the long workpiece. In this positioning groove 32, a first clamp plate 3 functioning as a first clamp tool is provided.
4 is a plurality of spacer shims 36 between the groove bottom surface
It is housed in a movable state in the depth direction of the groove with the two sides in between. At the center of the clamp plate 34, a position adjustment bolt 3 is provided in the thickness direction of the clamp plate 34.
When the heads 40 of No. 8 are engaged and protrude into the spaces 42 formed below the positioning grooves 32 through the plurality of shims 36, the positions between the positioning grooves 32 and the spaces 42 are Support part 4 formed between
It is screwed into the screw hole 46 of No. 4.

A circular stepped hole 48 is formed in the clamp plate 34, and the position adjustment bolt 38 is inserted into this stepped hole 48.
The circular head 40 of the spacer shim 36 is rotatably fitted without protruding from the upper surface of the plate 34, and as is clear from FIG. The bolt 38 is inserted through the shim 36, and it is possible to remove the shim 36 from between the clamp plate 34 and the support portion 44, or insert another shim therebetween. Then, the position adjustment bolt 38 is screwed forward or backward, and the plate 34 and the support part 4 are
By increasing or decreasing the number of shims present between the clamp plate 34 and the clamp plate 4, it is possible to adjust the position of the clamp plate 34 in the vertical direction.

On the other hand, the upper jig 14 is arranged above the lower jig 12 as described above. The top jig 14 is attached at one end to the upper part of the lower jig 12 via a bracket 52 and a shaft 54, and is moved around the axis of the shaft 54 in a plane perpendicular to the longitudinal direction of the long workpiece. is rotatable between a clamp position and an open position.

This upper jig 14 has the positioning groove 32 of the lower jig 12 in its clamp position.
A positioning groove 56 with a rectangular cross section is formed in a direction perpendicular to the rotation plane thereof, and a plurality of spacer shims 58 are sandwiched between the positioning groove 56 and the bottom surface of the groove, similar to the lower jig 12. The second clamp plate 60 is accommodated in a movable state in the groove depth direction, and the head 4 of the position adjustment bolt 62
0, and this position adjustment bolt 6
2 is screwed into a screw hole 64 formed in the top jig 14 and protrudes from the top surface thereof. The second clamp plate 60 functions as a second clamp tool, and has position adjustment bolts 6
As in the case of the lower jig 12, the position in the vertical direction can be adjusted by rotating the spacer shim 2 and increasing or decreasing the spacer shim 58.

When the top jig 14 is in the clamp position, a space with a rectangular cross section corresponding to the cross section of the long workpiece is formed between the clamp plate 60 and the clamp plate 34 of the lower jig 12. In this embodiment, the vertical dimension of this space corresponds to the W-direction dimension of the long workpiece in FIG. 3, and the horizontal dimension corresponds to the H-direction dimension. Then, the position adjustment bolt 38 and spacer shim 36 on the lower jig 12 side
The position adjustment bolt 62 and spacer shim 58 on the side of the tensioner jig 14 together constitute an adjustment device that adjusts the amount of reverse strain to be applied to the long workpiece in the W direction. In addition, when the tensioning jig 14 is rotated to the open position, the free end of the tensioning jig 14 is rotated by an amount sufficient to supply a long workpiece between both clamp plates 34 and 60. is spaced apart from the lower jig 12.

A U-shaped engagement notch 66 is formed at the free end of the up-up jig 14 from the end surface of the free end side toward the positioning groove 56 side, and is formed along the rotation plane of the up-up jig 14. This engagement notch 6
A clamp bolt 68 is fitted into the inside of the clamp bolt 6 . This clamp bolt 68 is
One end is attached to the side surface of the lower jig 12 via a bracket 70 and a shaft 72, and is supported so as to be rotatable around the axis of the shaft 72 in a direction parallel to the rotation plane of the upper jig 14. When it is fitted into the engagement notch 66, its tip portion protrudes by a certain distance from the upper end of the engagement notch 66, and a clamp nut 74 is screwed into this protruded portion. Therefore, if the clamp nut 74 is tightened with the long workpiece positioned between the clamp plates 34 and 60, the tension jig 14 will be tightened against the elastic force of the long workpiece. In this embodiment, the clamp bolt 68 and the clamp nut 74 together constitute a drive mechanism that rotates the top jig 14 toward the clamp position. There is.
On the other hand, if the clamp bolt 68 is rotated around the axis of the shaft 72 and disengaged from the engagement notch 66 with the clamp nut 74 loosened, the top jig 14 is directed to the open position. It can be rotated once.

In addition, starting with this clamp nut 74,
The position adjustment bolts 38, 62, the horizontal position adjustment bolt 26, etc. are each provided with a tool engagement portion that can be engaged with an impact wrench, so all rotation operations thereof are This can be done with an impact wrench.

Next, a method of using the welding jig 10 configured as above will be explained.

As shown in FIG. 2, such a welding jig 10 is installed at five locations (portions a, b, c, d, and e) on the base 18 along the longitudinal direction of a long workpiece. Then, by rotating the position adjustment bolt 38 of the lower jig 12 and adjusting the number of shims 36, the vertical position of the first clamp plate 34 can be adjusted. The position of the second clamp plate 60 in the vertical direction is adjusted by rotating the shims 58 and adjusting the number of shims 58, thereby making it possible to apply a reverse strain that cancels out the estimated welding strain at each part of the long workpiece. Also,
The horizontal position of the lower jig 12 with respect to the base 18 is adjusted by rotating the position adjustment bolts 26, 26 with the lock bolt 24 loosened, and fixed at that position by the lock nut 30 and the lock bolt 24. do.

The position adjustment of the lower jig 12 and the position adjustment of both clamp plates 34, 60 are carried out by
After welding is carried out for each of the welding jigs 10 at positions a to e in accordance with the regular dimensions of each part of the long workpiece, loosen the clamp nut 74, lower the clamp bolt 68, and pivot the top jig 14. 54 to the open position. In this state, a long workpiece (side member material) is supplied between both clamp plates 34 and 60 across each welding jig 10, and set in the positioning groove 32 of the lower jig 12. At this time, the long workpiece 32 is held by the groove wall surfaces on both sides of the positioning groove 32.
The position in the H direction is defined.

Next, the clamp bolt 68 is raised and fitted into the engagement notch 66 of the top jig 14, and then the clamp nut 74 is tightened. As a result, the upper jig 14 is rotated toward the clamp position, and the clamp plate 60 is rotated toward the lower jig 1.
The elongated workpiece is brought close to the second clamp plate 34 against the elastic force of the elongated workpiece, and the above-mentioned reverse strain is forcibly applied to the elongated workpiece. When the attachment jig 14 is rotated to the clamping position, as is clear from FIG. 9, the long workpiece is sandwiched between the clamp plates 34 and 60 from both sides in the W direction. It is clamped and held in place. Note that the outer rail 4 and the inner rail 6 of the long workpiece are tack-welded in advance at a plurality of locations and have integrity.

With the reverse strain applied and positioned as described above, the outer rail 4 and the inner rail 6
After welding, loosen the clamp nut 74, lower the clamp bolt 68, and remove the top jig 14.
is rotated to the open position to take out the welded product, but as described above, welding is performed with a reverse strain applied in the direction that cancels out the welding strain, so a welded product close to the regular size can be obtained.

However, since there is usually an error between the estimated amount of welding strain and the actual amount of welding strain, after taking out the welded side member, error)
The positions of the clamp plates 34 and 60 of the lower jig 12 and the upper jig 14 are adjusted by the measured error by rotating the position adjustment bolts 38 and 62 and spacer shim 3 as described above.
Correct in the positive or negative direction by inserting/removing parts 6 and 58. Further, if necessary, the positions of the lower jig 12 and the upper jig 14 are corrected and positioned by rotating the position adjustment bolts 26, 26.

After carrying out a welding trial in this way and measuring the actual welding strain, and determining the positions of both clamp plates 34, 60, etc. based on that, the long workpiece is placed in the positioning groove 32 of the lower jig 12. By setting and tightening the clamp nut 74, a reverse strain is applied to the long workpiece to cancel out the welding strain at the same time as positioning during welding.If welding is performed in this state, regardless of the welding strain, Welded products with high dimensional accuracy can be easily obtained.

Further, since all the members to be screwed forward and backward, including the clamp nut 74, can be rotated by an impact wrench, there is an advantage that the work can be done quickly.

In the embodiment described above, the clamp bolt 68 and the clamp nut 74 were used as the drive mechanism for rotating the tensioner jig 14 to the clamp position, but instead of this, a mechanical doubler using a link or a cam, etc. The drive mechanism can be configured by a force mechanism, or can also be configured by a hydraulic cylinder or the like.

Further, a configuration in which the lower jig 12 can be moved in the horizontal direction and the position thereof can be adjusted is not necessarily an essential requirement, and it is possible to omit this and simply fix the lower jig 12 on the base 18. It is also possible.

Furthermore, instead of the lower jig 12 and the top jig 14 as the first jig member and the second jig member,
A second jig member can also be rotatably attached to the side of the first jig member.

Furthermore, the present invention can be applied not only to welding jigs for welding frames with a box-shaped cross section, but also to welding jigs for welding pipe frames with a circular cross section. It is not limited to member welding.

In addition, although specific explanations are omitted, it goes without saying that the present invention can be implemented with various changes, improvements, etc. based on explanations by those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a side member of a truck, which is an example of a long product, and FIG. It is also a diagram showing the following. Third
The figure is a - sectional view in FIG.
The figure is a diagram conceptually showing welding distortion occurring in such a long workpiece. FIG. 5 is a perspective view of a welding jig which is an embodiment of the present invention, FIG. 6 is a plan view thereof, and FIG. 7 is a front view thereof. Figure 8 shows the fifth
FIG. 2 is an exploded perspective view showing the welding jig shown in the figure exploded into main components. FIG. 9 is a partial perspective view showing a state in which a long workpiece is positioned and clamped on the welding jig. {4: Outer rail, 6: Inner rail}...
(Long material), 10: Welding jig, 12: Lower jig (first jig member), 14: Atsupa jig (second jig member), 18: Base, 32, 56: Positioning groove,
34: first clamp plate (first clamp tool),
36, 58: Spacer shim, 38, 62: Position adjustment bolt, 60: Second clamp plate (second clamp tool), 66: Engagement notch, {68: Clamp bolt, 74: Clamp nut}... (Drive mechanism) .

Claims (1)

[Claims for Utility Model Registration] In order to make a plurality of elongated materials into an integrated elongated product by welding them along the longitudinal direction, three or more elongated materials are placed on a base along the longitudinal direction of the elongated materials. A welding jig that clamps arranged long materials at three or more locations spaced apart in the longitudinal direction, and holds the long materials in a state where a reverse strain is applied to cancel the welding strain. , a first jig member fixed to the base and equipped with a first clamping tool whose position in the direction in which the reverse strain is to be applied is adjustable; mounted so as to be rotatable between an open position and a clamped position in a plane substantially perpendicular to the
a second clamping tool whose position in the direction in which the reverse strain should be applied is adjustable at a position facing the first clamping tool, and the length between the second clamping tool and the first jig member in the open position; a second jig member that allows supply of the elongated material and clamps the elongated material by sandwiching it from both sides between the first clamping tool and the second clamping tool at the clamping position; the first clamping tool; With the second clamping tool pre-positioned at a position where it can apply an appropriate amount of the reverse strain, the second jig member is rotated toward the clamping position with a force that overcomes the elastic force of the elongated material. A welding jig for a long product, comprising a drive mechanism for holding the clamped product in the clamp position.