JPH05296Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) This invention relates to a welding device suitable for welding press-formed objects such as vehicle fuel tanks. The present invention relates to a welding device that supports a welding machine on a movable frame to improve work efficiency.

(Prior art) In recent years, fuel tanks and the like for motorcycles have been constructed by press-forming thin steel plates into divided halves of a tank body curved in a roughly U-shaped cross section, and joining these divided halves using automatic welding equipment. be done. Conventionally, welding of such curved press-formed bodies was carried out using, for example,
The welding device described in Publication No. 32857 is used. This welding device holds a pair of curved press-formed bodies with a fixed receiving jig on one side and a movable holding jig on the other side, and welds the joints of these press-formed bodies by scanning the welding torch. It is something. Such a welding device drives a movable holding jig to hold the transported press-formed body between the holding jig and the receiving jig, and then moves a welding torch to the joint of the press-formed body. The welding torch is scanned to weld the joint.

(Problem to be solved by the invention) However, in such conventional welding equipment, the welding torch is turned on after the movable holding jig is driven and the press-formed body is held between it and the receiving jig. It is necessary to move the welding torch to the joint and then scan it, which increases the time (cycle time) required for one process, and also requires a moving table etc. to move the welding torch together with the scanning mechanism. There was a problem that it was necessary to increase the size of the device.

This invention was made in view of the above-mentioned problems, and aims to provide a welding device that can shorten cycle time and be downsized.

(Means for solving the problem) This invention holds two plate-like members 12a, 12b, each of which is curved at least in part, against each other, and moves the abutted portion of these plate-like members 12a, 12b by itself. In a welding device that performs welding using welding machines 32 and 32', a fixed receiving jig 13 is attached to the fixed frame 11 and receives one side of the plate members 12a and 12b.
and movable presser jigs 17a and 17b that are attached to the movable frame 16 that moves relative to the fixed frame 11 and press the plate-like members 12a and 12b to the fixed receiving jig 13, and the movable frame The gist is that the welding machines 32, 32' are attached to the welding machine 16 so as to be self-propelled.

(Function) According to the welding device according to this invention, the movable frame supports the welding machine and the self-propelled mechanism together with the movable presser jig, and when the movable frame is driven and the plate member is held by the movable frame, the welding The machine moves together with the movable frame to the butt portion of the plate-shaped members. Therefore, after this, the abutting portions of the plate members can be welded simply by scanning the welding machine with the self-propelled mechanism. Therefore, there is no need to move the welding machine separately from the movable frame to the butting part of the plate-shaped members, and a mechanism for moving the welding machine is not required, allowing for miniaturization and shortening of cycle time. I can figure it out.

(Example) Hereinafter, an example of this invention will be described based on the accompanying drawings.

1 to 3 show an embodiment of the welding device according to this invention, with FIG. 1 being a front view, FIG. 2 being a side view, and FIG. 3 being a plan view.

In the drawing, reference numeral 11 denotes a fixed frame that is placed stationary on the floor surface, and a receiving jig 13 that holds the lower surfaces of the pair of press-formed bodies 12a and 12b is fixedly installed on the upper part of the fixed frame 11. . These pair of press-formed bodies 12a and 12b are press-formed into a curved shape obtained by dividing the fuel tank of a motorcycle.As will be described later, the joints are butted together and placed on a holding jig 13. The abutted portion (hereinafter referred to as the welded portion) is welded over the entire range. The upper surface of the receiving jig 13 is formed in a curved shape corresponding to the curved shape of the press molded bodies 12a, 12b, and corresponds to the welded part of the press molded bodies 12a, 12b in the extending direction of the welded part (hereinafter referred to as A welding groove 13a extending in the axial direction is formed. Further, a total of four guide rods 14a, 14b, 14'a, 14'b are erected on the fixed frame 11, two on each side of the receiving jig 13. Power cylinders 15, 15' are supported between guide rods 14a, 14b, 14c, and 14d.
The power cylinders 15, 15' have cylinder bodies 15a, 15a' fixed to a fixed frame 11, and the tips of rods 15b, 15'b connected to both ends of a movable frame 16 extending in the X-axis direction. The movable frame 16 is slidably penetrated by the guide rods 14a, 14b, 14'a, 14'b, and driven by power cylinders 15, 15'.
It moves up and down guided by 14'b.

The movable frame 16 has the receiving jig 1 at the bottom.
3, a pair of presser jigs 17a, 17b and a pair of posture holding members 18a, 18b are fixedly provided, respectively. The holding jigs 17a and 17b are arranged around the welding groove 13a of the receiving jig 13.
A welding torch 8, which will be described later, is placed between these holding jigs 17a and 17b at a predetermined distance in a horizontal direction (hereinafter referred to as the Y-axis direction) perpendicular to the extending direction of the
The scanning space is set. These presser jigs 1
7a and 17b are respectively press molded bodies 12
a, 12b, and as described later, when the movable frame 16 moves downward, the lower end engages with the inner surface of the press-formed bodies 12a, 12b to receive the press-formed bodies 12a, 12b. It is held between the jig 13. Posture holding members 18a, 18b
are formed to have dimensions corresponding to the upper end portions of the press-formed bodies 12a and 12b, respectively, and as described later, when the movable frame 16 moves downward, the press-formed body 1
The welding posture of the press-formed bodies 12a, 12b is maintained by engaging with the inner circumferential surfaces of the upper ends of the press-formed bodies 12a, 12b.

In addition, a pair of rails 19 for moving in the X-axis direction are provided on the upper part of the movable frame 16 and extend in the extending direction of the welding section, and two movable platforms 20 supporting welding machines to be described later are mounted on the rails 19. , 20' are slidably provided. In addition, the above-mentioned moving table 20, 2
0' is the same, and below, only one movable base 20 will be explained, and the other movable base 20 will be explained below.
Regarding 0', the same parts are designated with dash symbols and the explanation will be omitted.

The movable table 20 has a ball nut (not shown) fixedly attached to the ball screw of the feed shaft 21 at its lower part, and is supported on the rail 19 so as to be slidable on the rail 19 by rotation of the feed shaft 21. . Feed shaft 2
1 is rotatably supported on the movable frame 16 in parallel with the rail 19, and has an end connected to the movable frame 16.
Motor 2 for driving in the X-axis direction provided at the upper end
It is connected to 2. This motor 22 is connected to a control device (not shown), and receives power from the control device to rotationally drive the feed shaft 21 . Note that 23 is a flexible cover that covers the motor 22 to make it waterproof and dustproof, and 24 is a stopper provided at the opposite end of the movable table 20.

Furthermore, a rail 25 for moving in the Y-axis direction is provided on the movable table 20, and a support 26 is slidably erected on the rail 25. A motor 27 for axial drive is provided. Although the support column 26 is not shown, a ball nut is fixed thereto which is screwed into a ball screw of a feed shaft connected to a motor 27, and slides on the rail 25 as the feed shaft driven by the motor 27 rotates.

A motor 28 for driving in the Z-axis direction is provided at the upper end of the column 26, and a motor 28 for driving in the vertical direction (hereinafter referred to as
A rail for movement in the Z-axis direction extending in the Z-axis direction (referred to as the Z-axis direction) and a feed shaft connected to the motor 28 are installed in parallel, and a ball nut (not shown) that is threadedly engaged with the feed shaft is attached to this rail. A fixed machine base 29 is slidably supported. The motor 28 is connected to and receives power from the control device, and the machine base 29 is driven on the rail by rotation of a feed shaft driven by the motor 28. A support shaft 30 is rotatably supported on the machine base 29, and a motor 31 for rotationally driving the support shaft 30 is provided. Support shaft 3
0 is the welding torch 32a of the MIG automatic welding machine 32
is supported, and this torch 32a is driven by a motor 31 to rotate through a predetermined angle around a support shaft 30. The motor 31 is connected to each of the aforementioned motors 22, 2.
Similarly to 7 and 28, it is connected to a control device and is supplied with power from this control device. Note that the details of this MIG automatic welding machine 32 are clear from the above-mentioned publications and the like, so the explanation will be omitted.

Next, the operation of this embodiment will be explained.

This welding device includes power cylinders 15, 15',
Motors 22, 22', 27, 27', 28, 28',
31, 31' and MIG automatic welding machine 32, 32'
is controlled by a control device, and the welded portions of the transported press molded bodies 12a, 12b are welded by MIG automatic welding machines 32, 32' in the following manner to form a fuel tank.

First, the press-formed bodies 12a and 12b are placed on the receiving jig 13 so as to butt against each other, and the welded portions of these press-formed bodies 12a and 12b are positioned on the welding groove 13a of the receiving jig 13. Then, as shown by the two-dot chain line in the figure, the movable frame 16 is moved downward by the power cylinders 15, 15', and each press-formed body 1 is
2a, 12b are held between the holding jigs 17a, 17b and the receiving jig 13, and the posture holding member 18
The upper portions of the press molded bodies 12a and 12b are held by a and 18b.

Next, the movable table 20,
20' is driven in the X-axis direction, the motors 27, 27' drive the columns 26, 26' in the Y-axis direction, the motors 28, 28' drive the machine bases 29, 29' in the Z direction, and The welding torches 32a, 32a' are rotated by the motors 31, 31', one of the welding torches 32a is scanned along the area A of the welded part of the press-formed bodies 12a, 12b, and the area is welded. Then, the other welding torch 32'a is scanned along the range B of the welded portion of the press-formed bodies 12a, 12b to weld the area. At this time,
MIG automatic welding machine 32, 32' has a movable frame 16
Since the MIG automatic welding machines 32, 32' are supported by the presser jigs 17a, 17b and move together with the presser jigs 17a, 17b, there is no need to move the MIG automatic welding machines 32, 32' independently of the presser jigs 17a, 17b. Can be done continuously. Therefore, MIG automatic welding machine 3
There is no need for a power source or mechanism for moving 2, 32' independently, and the overall size can be reduced, and
The time from holding the press-formed bodies 12a, 12b to welding is shortened, and the cycle time can also be shortened. Furthermore, during welding, the square press molded bodies 12a and 12b are not only held by the receiving jig 13 and the holding jigs 17a and 17b, but also held in the welding posture by the posture holding members 18a and 18b. Therefore, these press molded bodies 12
Even if heat distortion or the like occurs in parts a and 12b, the position of the welded part does not shift, and welding can be performed accurately. Furthermore, this welding device has press molded bodies 12a, 12b.
One welding torch 32
In addition, since the welding area B of the press-formed bodies 12a and 12b is simultaneously welded using the other welding torch 32'a, the time required for welding is shortened, and the cycle time can be further shortened. can.

After welding is completed, the power cylinder 15,
15' moves the movable frame 16 upward to press the press molded body 1 to which the holding jigs 17a and 17b are joined.
2a, 12b, this press molded body 12
a and 12b are taken out from above the receiving jig 13. Even at this time, since the MIG automatic welding machines 32, 32' move upward together with the movable frame 16,
Jig 17a for holding the MIG automatic welding machine 32, 32',
There is no need to move it independently from 17b, and the process from welding to removal can be carried out continuously, thereby shortening the cycle time.

In the above-mentioned embodiments, a MIG automatic welding machine is used as an example, but it goes without saying that other welding machines such as seam welding can be used, and the present invention can also be applied to welding structures other than fuel tanks. Needless to say.

(Effects of the invention) As explained above, according to the welding device according to this invention, since the welding machine is supported on the movable frame provided with the movable holding jig that holds the press-formed object during welding, the press-formed object can be The cycle time for continuously holding, welding, and removing the welding machine can be shortened, and a mechanism for moving the welding machine is not required, making it possible to downsize the welding machine.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the welding device according to this invention, in which FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a plan view. 11... Fixed frame, 12a, 12b... Press molded body, 13... Receiving jig, 16... Movable frame, 17a, 17b... Holding jig, 18a,
18b... Posture holding member, 20, 20'... Moving table, 32, 32'... MIG automatic welding machine, 32a,
32'a...Welding torch.

Claims (1)

[Scope of claims for utility model registration] (1) Two plate-like members 1 with at least a portion curved
2a, 12b are butted and held, and the welding device welds the abutting portions of these plate-like members 12a, 12b using self-propelled welding machines 32, 32', which are attached to a fixed frame 11 to A fixed receiving jig 13 that receives one surface of the members 12a, 12b; and a movable frame 16 that moves relative to the fixed frame 11, and is attached to a movable frame 16 that supports the plate-like members 12a, 12b.
3; and welding machines 32, 32' attached to the movable frame 16 so as to be self-propelled. (2) The movable frame 16 includes a first welding machine 32 that welds a part of the abutting part, and a second welding machine 32' that welds the remaining part of the abutting part.
2. The welding device according to claim 1, further comprising: a welding device as claimed in claim 1;