JPH0335487Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a device for fixing and holding a material to be welded when another member is welded to an inner surface having a substantially C-shaped cross section, and is particularly applicable to reinforcement of side rails of vehicles. The present invention relates to a fixing and holding device for welding materials suitable for welding.

[Conventional technology]

FIG. 7 is a perspective view of the frame of the truck. The frame of this truck has an inner channel 12 welded to the inside of a pair of side rails 10, 10, respectively. The truck frame has the side rails 10, 10 to which the inner channel 12 is welded as main girders, and the side rail 1
It has a ladder-like structure in which a plurality of cross members 14 are assembled between 0 and 10.

The side rail 10 and the inner channel 12 have a substantially C-shaped cross section in order to reduce the weight of the vehicle, and the side rail 10 and the inner channel 12 are welded into a square pipe shape. However, the truck frame is required to have high strength, and reinforcements are provided in the portions of the side rails 10 where particularly high rigidity is required.

That is, when forming a track frame,
As shown in FIGS. 8 and 9, the side rail 10
A side rail reinforcement 16 inscribed in the side rail 10 is welded to a predetermined location at a welding portion 18, and then an inner channel 12 is welded to the side rail 10 as shown in FIG. . However, if these members are welded without restraint, welding distortion occurs, which adversely affects product accuracy. In particular, side rail 10
If the welding between the inner channel 12 and the side rail reinforcement 16 is performed without restraint, the inner channel 12 may not be able to be inserted into the side rail 10 due to welding distortion.

FIG. 11 shows a front view of a conventional fixing and holding device for welding the side rail 10 and the side rail reinforcement 16.
Welding work using this fixing and holding device is performed as follows.

The side rail 10 with the side rail reinforcement 16 inserted therein is placed on the support stand 20, and the upper clamp 22 descending from above separates the side rail reinforcement 16 from the support stand 20 and the upper clamp 22. sandwiched between. Thereafter, the sides of the side rail 10 are pressed inward by the side clamps 24, 24, and the side rail 10 and side rail reinforcement 1 generated by the spring back of the side rail 10 are
Eliminate the gap between 6 and 6. side clamp 24
is fixed to the upper end of an arm 28 rotatably connected to the cylinder 26.
It is designed to open and close by operating the

After the side rail 10 and the side rail reinforcement 16 are fixed on the support base 20 as described above, predetermined welding portions are welded with the welding torch 30.

[Problem that the invention seeks to solve]

However, in the above fixed holding device, the side portion of the side rail 10 is held only by the side clamp 24.
The only thing that was required was to press inward to eliminate the gap between the side rail 10 and the side rail reinforcement 16. This is side rail 10 and side rail reinforcement 16.
A welding torch 30 for welding the side rail 1
This is because it is difficult to provide a complicated clamp structure on the inside of the side rail 10 because the clamp comes inside the side rail 10. Even the upper clamp 22 had to be installed in a place where welding is not performed in order to avoid slow impact with the welding torch 30.

Therefore, as shown in FIG. 12, the opening 32 of the side rail 10 collapses inward due to welding distortion when the side rail reinforcement 16 is welded, and the inner channel 12 is connected to the side rail 1.
There were many cases where it could not be inserted into 0. In order to insert the inner channel 12 into the side rail 10, it is necessary to widen the opening 32 in the side rail 10, which reduces product accuracy. Furthermore, the welding distortion caused by welding the side rail reinforcement 16 not only causes the opening 32 to fall inward, but also causes the side rail 10 to bend or twist in the longitudinal direction. . For this reason, when welding a large side rail reinforcement 16, there have been cases where it is necessary to anticipate the welding distortion of the side rail 10 in advance and bend the side rail 10 in the longitudinal direction before welding. In such a case, a strong clamping device (fixing and holding device) is required to bend the highly rigid side rail 10. However, in order to avoid the slow impact with the welding torch 30 described above, it is often impossible to apply sufficient reverse strain due to the restriction that the clamp material cannot be placed in an appropriate position.

The present invention has been made in order to eliminate the drawbacks of the prior art described above, and an object of the present invention is to provide a fixing and holding device for a welded material that can eliminate welding distortion of a welded material having a substantially C-shaped cross section. purpose.

[Means for solving problems]

The present invention includes a pair of arms that are raised and lowered by an actuator, a support base on which a material to be welded having a substantially C-shaped cross section is placed, and a support base that is provided at the upper end of each of the arms so that the material to be welded is a claw portion that locks the open end of the welding material; and a clamp portion that is provided on each of the arms below the claw portion and presses the side of the welded material inward as the arm descends. and an expansion/contraction mechanism that expands the distance between the arms when each of the arms is raised, and contracts and closes the distance between the arms when each of the arms is lowered.

[Effect]

In the present invention configured as described above, the claw portion provided on the arm that is raised and lowered by the actuator,
By locking the opening of the welded material, it is possible to prevent the opening of the welded material from falling inward. Further, by arranging a plurality of arms in the longitudinal direction of the welded material, it is possible to prevent longitudinal deformation of the welded material due to welding distortion.

〔Example〕

A preferred embodiment of the device for fixing and holding a welded material according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing an embodiment of the fixing and holding device according to the present invention. The embodiment shown in FIG. 1 incorporates a pair of fixed holding devices having the same structure, and the right fixed holding device is shown with the front side plate removed.

In FIG. 1, at a predetermined position on the upper plate 32,
A support stand 20 is provided. This support stand 20 has
A positioning pin 34 is attached so that the side rail 10 and the side rail reinforcement 16, which are the materials to be welded, can be placed at predetermined positions on the support base 20.

A front side plate 38 and a rear side plate 40 are attached between the upper plate 32 and the lower plate 36. A window 42 is formed in the front side plate 38, and the window 42 can be covered with a lid 44. A knuckle 46 is arranged between the front side plate 40 and the front side plate 40. The lower end of the knuckle 46 is connected to the cylinder 26, which is an actuator, and is moved up and down by operating the cylinder 26. Also, Natsukuru 46
, one end of the detection bar 48 is fixed. The other end of this detection bar 48 is connected to a dog 50.
The dog 50 is attached to the bracket 5 as shown in FIG.
Upper limit detection limit switch 54 and middle closed detection limit switch 5 attached to the side plate via 2
6. A lower limit detection limit switch 58 is activated.

On the other hand, a link 62 is attached to the upper part of the knuckle 46 via a shaft 60. The lower ends of the pair of arms 28 are rotatably connected to the link 62 via pins 64, 64. These arms 28, 28 have convex portions 6 whose upper ends are bent toward opposite sides.
6, and a claw portion 68 is attached to the lower part of the convex portion 66 via a slow impact material. This claw portion 68 is
A locking pawl 70 is formed at the lower part of the tip so that the opening of the side rail 10 can be locked. Further, a clamp portion 72 is provided below the claw portion 68 of the arm 28 via a slow impact material.

Each arm 28 has a substantially crank shape with a sloped portion at the bottom. And the inner slope part 7
4 and the outer inclined portion 76, together with guide rollers 82 and 84 rotatably provided between the front side plate 38 and the rear side plate 40 via shafts 78 and 80, constitute an expansion/contraction mechanism whose operation will be described in detail later. ing. In addition, as shown in FIGS. 2 and 3, the arm 2
Support rollers 86 for regulating the lateral movement of the arm 28 are rotatably provided on the upper plate 32 on both sides of the upper plate 32 .

The operation of the embodiment configured as described above is as follows.

First, when the knuckle 46 is raised from the lowered state by the cylinder 26, the inner inclined part 74 of the arm 28 comes into contact with the guide roller 80, and the left arm 28 shown in FIG. 1 moves counterclockwise. Further, the right arm 28 rotates clockwise. As a result, as the arm 28 rises, the distance between the tips of the paired arms 28, 28 widens. At this time, the guide roller 82
, as shown by the two-dot chain line, contacts the outer inclined portion 76 of the arm 28 to prevent the arm 28 from falling outward.

On the other hand, when the knuckle 46 rises, the detection bar 48 whose one end is connected to the knuckle 46 moves to the dog 50.
push upward. Then, when the nutcle 46 pushes up the arm 28 to a predetermined position, the dog 50
operates the middle closed detection limit switch 56,
The operation of cylinder 26 is stopped. As a result, the upper ends of the paired arms 28, 28 gradually expand and are maintained at a predetermined opening state, and the support base 20
It becomes possible to arrange the side rail 10 on top.

When the side rail 10 is placed in position on the support base 20 with the side rail reinforcement 16, the cylinder 26 is activated again to gradually lower the knuckle 46. As the nutcle 46 descends, each of the paired arms 28
The outer inclined portion 76 is guided by a guide roller 82,
It descends as the interval contracts and closes. Then, when the arm 28 is lowered to a predetermined position, the engaging claw 70 provided on the claw part 68 enters the inside of the opening of the side rail 10 and locks the opening, and the clamp part 7
2 presses the side of the side rail 10 inward. In this way, when the arm 28 fixedly holds (clamps) the side rail 10, the dog 50 lowered by the knuckle 46 via the detection bar 48 operates the lower limit detection limit switch 58 and stops the operation of the cylinder 26. do. In addition, when attempting to widen the distance between the paired arms 28, 28, the knuckle 46 is raised until the dog 50 operates the upper detection limit switch 54.

As described above, according to this embodiment, the side rail 10, which is the workpiece to be welded, can be fixedly held on the support base 20 by the claw portion 68 and the clamp portion 72 provided on the arm 28, so that the welding torch 30 can be It is possible to weld the side rail 10 and the side rail reinforcement 16 without causing any slow impact with the members. The locking pawl 70 provided on the pawl portion 68 can prevent the opening of the side rail 10 from collapsing inward due to welding distortion caused by welding.

In addition, in the actual welding work between the side rail 10 and the side rail reinforcement 16, as shown in FIG. Clamp the rail 10 at a predetermined location. The trolley 92 is equipped with wheels 96 that roll on rails 94, and receives the side rail 10, which is a work, onto the fixed holding member 90 at a predetermined work loading position, and moves the side rail 10 to the welding work position as shown by an arrow 98. 100.

Note that the side rail 10 is carried into the fixed support device 90 provided on the trolley 92 by following the arrow 10 in FIG.
As shown in 2, 104, the cart 92 is carried in pairs from both sides. And welding work position 100
, a welding torch 30 is installed on a beam 108 suspended horizontally between columns 106, 106, and this welding torch 3
0 moves as shown by the arrow 110 to weld the side rail 10 and the side rail reinforcement 16 at a predetermined location.

By clamping the side rail 10 at multiple locations in this manner, it is possible to prevent the side rail 10 from bending in the longitudinal direction due to welding distortion.

The welded side rail 10 is released from the clamp of the fixed holding device 90 and moved to the welding position 100.
(Dolly 92) Unloaders 11 placed on both sides
2 and 114, and are sequentially conveyed to predetermined positions as shown by arrows 116 and 118.

〔Effect of the invention〕

As described above, according to the present invention, each of the pair of arms that is raised and lowered by the actuator is provided with a claw portion that locks the opening of the welded material and a clamp portion that presses the welded material inward. This can prevent the welding material from falling inward at the opening during welding.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the device for fixing and holding materials to be welded according to the present invention, Fig. 2 is a view taken in the direction of Fig. 1, and Fig. 3 is a cross section taken along the - line in Fig. 1. 4 is a sectional view taken along the - line in FIG. Figures 8 to 10 are explanatory diagrams showing the welding procedure for side rails and inner channel;
FIG. 11 is a front view of a conventional fixing and holding device for fixing and holding a side rail, and FIG. 12 is an explanatory diagram of welding distortion caused by welding using the conventional fixing and holding device. 10... Side rail, 16... Side rail reinforcement, 26... Cylinder, 28... Arm, 68... Claw portion, 70... Engaging claw, 72...
Clamp part, 74... Inner inclined part, 76... Outer inclined part, 82, 84... Guide roller.

Claims (1)

[Claims for Utility Model Registration] A pair of arms that are raised and lowered by an actuator; A support base on which a material to be welded having a substantially C-shaped cross section is placed; a claw portion that locks the open end of the material to be welded; provided on each of the arms below the claw portion, and as the arm descends, the side portion of the material to be welded is A device for fixing and holding materials to be welded, comprising: a clamp portion that presses; and an expansion/contraction mechanism that expands the arm spacing when each of the arms rises and contracts and closes the arm spacing when each of the arms descends. .