JPH0224193B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is mainly applied to a workpiece consisting of a plurality of divided members, which are first subjected to tack welding to be integrated, and then subjected to additional stroke welding to form a product. Regarding the method.

As a conventional method of this kind, Japanese Patent Publication No. 56-7473 discloses a method in which a jig table for work setting is made to be able to reciprocate between a rear setting position and a front welding position by means of a longitudinal conveying device in the front and back direction. A first welding device for tack welding and a second welding device for additional welding are selectively provided at the welding position, and a workpiece on the jig table carried into the welding position is temporarily welded at the first welding position. After welding, the jig table is raised to transfer the workpiece to the upper workpiece holder prepared at the welding position, and after the transfer, the jig table is moved back to the set position, and the second The welding device performs additional stroke welding on the workpiece held in the holder, and the next workpiece can be set on the jig table at the setting position during the additional stroke welding. However, in this method, after the completion of additional stroke welding, the jig table is moved forward and carried into the welding position, and then tack welding is performed and the workpiece is moved to the holder by raising and lowering the jig table. Unless the transfer is performed, the next additional stroke welding will not be performed, and it is desired to further improve productivity by reducing this time lag.

The object of the present invention is to provide a method that satisfies such demands, and the purpose of the present invention is to move a workpiece jig stand between the rear setting position and the front welding position by a longitudinal conveying device in the front and back direction. is capable of reciprocating, and an upper workpiece holder and an additional-stroke welding device for performing additional-stroke welding on the workpiece held in the holder are provided at the welding position, and tack welding is performed on the workpiece on the jig table. After the welding, the workpiece is transferred to the holder by raising the jig stand, and after the delivery, the jig stand is moved back to the set position, and a welding machine is mounted on the jig stand. At the same time, the conveying device is made to be able to be raised and lowered by a lifting device, and the jig table is moved forward to the welding position while being raised along with the conveying device by the lifting device, and during this forward movement, the workpiece on the jig table is touched. A feature is that tack welding is performed using a welding machine.

Next, the present invention will be explained with reference to the illustrated embodiments.

Referring to FIGS. 1 and 2, 1 is a jig stand for work setting, and 2 is a conveying device for reciprocating the jig stand 1 between a setting position A at the rear and a welding position B at the front. The jig table 1 includes a jig main body 4 supported on a cart 5, which includes a plurality of setting members 3 such as positioning pins and clamp members for positioning and fixing a plurality of divided members constituting the workpiece W. The conveyor device 2 is detachably attached to a jig base 6 via a lock cylinder 7, and the conveyor device 2 is provided with left and right side plates 8, 8, which are longitudinally longitudinal and extend between the two positions A and B. Each guide rail 9 and each conveyance chain 10 are provided along the longitudinal direction on the inner surface of each side plate 8, and each side plate 8,
The trolley 5 is disposed between them, and is rotatably supported by each guide rail 9 via a plurality of guide rollers 5a, and connected to each chain 10 via a continuous piece 5b. By circulating the chain 10, the trolley 5, and therefore the jig table 1, are given reciprocating motion between the set position A and the welding position B. The jig base 6 is rotatably supported, and each cam plate 11 is positioned inside the rear end of each side plate 8 at the set position A, and has a rear downward cam groove 11a continuous with each guide rail 9. Each cam plate 1 is provided so as to be able to rise and fall freely.
Set the jig table 1 in the set position A with the jig table 1 standing up.
When the jig base 6 moves backward, the guide rollers 6a provided on both sides of the rear end of the jig base 6 are inserted into the cam grooves 11a, and the jig base 6 is tilted backward about its shaft support 6b. The work of setting the workpiece to the jig main body 4 at the setting position A can be easily performed in a comfortable posture. To replace the jig main body 4, return the jig base 1 to the set position A with each cam plate 11 laid down, and place the jig base 6 in a horizontal position using the lock cylinder 5c provided on the trolley 5. Hold it in place. 11b indicates an undulation cylinder of the cam plate 11.

Further, each of the conveyance chains 10 is looped between a drive sprocket 10a provided on each side plate 8 and a plurality of idle sprockets 10b, and is driven in a circular manner in the front and back direction. The pair of driving sprockets 10a, 10a are connected by a synchronizing shaft 10c, and are driven synchronously with each other by a driving motor 10d provided on one of the side plates 8, 8.

At the welding position B, there is an upper workpiece holder 12.
and an additional welding device 13 on both sides, and the holder 12 is provided with a plurality of clamp members 12a for gripping the workpiece W, and the plurality of clamp members 12a are installed in the machine frame at the welding position B. The index device 15 on the holder 14 is provided for selective operation, and the additional welding device 13 is constructed of an industrial robot equipped with a welding machine 13a.
A predetermined number of additional strokes of welding is applied to the workpiece W held at the position.

According to the present invention, the welding machine 16 is mounted on the jig stand 1.
When the welding machine 1 is loaded and moved to the welding position B,
6 performs tack welding on the workpiece W on the jig table 1, and also provides an elevating device 17 for raising and lowering the conveying device 2, so that it can be raised and lowered together with the conveying device 2 when the jig table 1 reciprocates. In addition to the diagram shown in the figure, in further detail, the welding is carried out corresponding to each temporary attachment point of a plurality of divided members constituting the workpiece W on the jig main body 4 of the jig stand 1. A plurality of machines 16 are mounted, and the elevating device 17 is composed of a pair of X-shaped link mechanisms 18, 18 connected to each side plate 8 on both sides of the conveying device 2.

Each of the link mechanisms 18 has a drive link 18a and a driven link 18b which are pivoted to cross each other in an X shape, and a movable element 18e connected to a cylinder 18d to a fixed frame 18c provided below each side plate 8. is provided so as to be movable forward and backward along the guide groove 18f on the fixed frame 18c, and each side plate 8 supports a movable frame 18g so as to be movable forward and backward, and the drive link 18a has one end pivotally connected to each side plate 8. The driven link 18 has one end pivotally connected to the mover 18e and one end to the fixed frame 18c.
The other end of b is pivotally connected to the movable frame 18g, and each link mechanism 1 is connected by the cylinder 18d.
8 so that each side plate 8 can be moved up and down horizontally without moving in the front-back direction.

In the drawing, 19 indicates the movable frame 18g provided on each side plate.
The guide rail is shown.

In addition, in the illustrated example, a payout device 20 is provided for dispensing the work W subjected to multi-stroke welding at the welding position B to a payout position C in front of the workpiece W, and the device 20
As shown in FIG.
and a support 20c for the workpiece W provided on the trolley 20a via a cylinder 20b so as to be freely raised and lowered. The reciprocating motion between the welding position B and the set position A of the jig table 1 causes the cart 20a to be reciprocated between the dispensing position C and the welding position B.

Next, to explain its operation, first, a plurality of divided members constituting the workpiece W are set on the jig table 1 located at the set position A, and then the conveying device 2 and the lifting device 17 are operated synchronously to move the jig. The table 1 is moved forward to the welding position B and raised, and at the same time the jig table 1 is
Tack welding is performed on the workpiece W using the upper welding machine 16.

According to this, at the end of the forward movement of the jig stand 1, the jig stand 1 is raised to a predetermined work transfer position that matches the upper work holder 12 prepared for the welding position B, and the work W is temporarily transferred. The attachment welding is completed, and the time lag due to tack welding after the completion of forward movement and the rise of the jig table 1 to the workpiece transfer position is eliminated, and the workpiece W can be efficiently transferred to the holder 12. .

After the workpiece is delivered, the jig stand 1 is moved back to the set position A in a reverse operation to the above, and the additional stroke welding device 1 is attached to the workpiece W held by the holder 12.
3, and during this welding work, the next workpiece W is placed on the jig table 1 that has been moved backward to the set position A.
Set.

In this case, the cart 20a of the dispensing device 20 is waiting to be carried into the welding position B in conjunction with the jig table 1,
After the additional stroke welding is completed, the receiver 20c of the device 20 is raised and lowered to allow the receiver 20c to receive the workpiece W on the holder 12.

After receiving this, the jig stand 1 is moved forward to the welding position B in the same manner as above, and the cart 20a is carried out to the unloading position C to unload the workpiece W, and the workpiece W is tack welded to the holder 12. Next work W
is delivered, and the welding work of the work W is continuously performed by repeating the above operations.

Depending on the type of workpiece W, the tack welding may not be completed during the forward movement of the jig table 1, and in this case, after the forward movement is completed, the additional stroke welding device 13 performs tack welding of the remaining parts. and hold the workpiece W in the holder 1.
However, the time lag is significantly shortened compared to the conventional method in which tack welding is started after the forward movement is completed.

As described above, according to the present invention, a welding machine for performing tack welding on a workpiece on the jig table is mounted on the jig table, and the jig table is reciprocated between the set position and the welding position. The conveyance device can be raised and lowered by a lifting device, and when the jig table is moved forward to the welding position, tack welding and raising of the jig table to a predetermined position are performed. Compared to the conventional method, which involves tack welding and raising the jig table toward the workpiece holder, the time lag between the completion of additional stroke welding and the start of the next additional stroke welding is greatly shortened. , has the effect of improving productivity.

[Brief explanation of drawings]

FIG. 1 is a side view of an example of an apparatus used to carry out the method of the present invention, FIG. 2 is a front view of the conveying device seen from the left side of FIG. 1 with the conveying device raised, and FIG. 3 is a dispensing device FIG. DESCRIPTION OF SYMBOLS 1... Jig stand, 2... Transfer device, 12... Work holder, 13... Multi-stroke welding device, 16... Welding machine, 17... Lifting device, A... Set position, B...
...Welding position, W...Work.

Claims (1)

[Claims] 1. A jig table for setting the workpiece is made to be able to reciprocate in the longitudinal direction between the rear setting position and the front welding position using a longitudinal conveying device, and the workpiece is held at the upper workpiece holder at the welding position by the holder. and an additional-stroke welding device for performing additional-stroke welding on the workpiece that has been tack welded, and after performing tack welding on the workpiece on the jig table, the workpiece is transferred to the holder by raising the jig table, and the delivery is carried out. After that, the jig table is moved back and forth to the set position, and a welding machine is mounted on the jig table, and the conveying device can be raised and lowered by a lifting device,
The jig table is raised along with the transport device by the elevating device and moved to the welding position, and during this forward movement, the work on the jig table is tack welded by the welding machine. Characteristic automatic welding method.