JPH05318180A - Device for delivering work to welding machine - Google Patents

Abstract

PURPOSE:To shorten the cycle time for the welding process and to effectively weld by reducing the loss time of the welding working. CONSTITUTION:Work receiving means (supporting arms) 9, 10 are provided to a ram 4 being movable up and down of a welding machine 1, and a 1st transferring means (shuttle transferring device) transferring one side work 14 among works 13, 14 to be joined to a welding jig of the welding machine 1. A 2nd transferring means (loader device) 16 transferring the other side work 13 to the ram 4 is provided at the upper position of the 1st transferring means. The other side work 13 is received with work receiving means 9, 10 from the 2nd transferring means 16 at the elevation position of the ram 4, and one side work 14 is set to the welding jig by the 1st transferring means, and the other side work 13 which is held with the work receiving means 9, 10 is set to the welding jig by lowering the ram 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work transfer device for a welding machine.

[0002]

2. Description of the Related Art Conventionally, when welding a pair of upper and lower works (rear floor panel assembly and rear floor member assembly) 51 and 52 which constitute a vehicle body of an automobile as shown in FIG. 9, they are shown from different directions. No welder work 5
A shuttle transfer device for transferring 1, 52 and a loader device (not shown) are used. Then, such work 5
In the process of automatically welding 1, 52, the lower workpiece 52 is conveyed from the direction of the arrow a in the drawing by the shuttle conveying device and set on the welding jig (not shown) of the welding machine in advance, and The loader device that conveys the work 51 enters above the welding jig at a right angle from the direction of arrow b. Next, after confirming that the lower work 52 is set on the welding jig, the loader device descends in the direction of arrow c and the upper work 51 is set on the welding jig. The work 52 is superposed in an unclamped state.

After confirming that the loader device is raised and retracted and is located outside the area where the loader device interferes with the ram of the welding machine, the welding jig clamps the workpieces 51 and 52 and the ram of the welding machine moves. It descends and performs predetermined automatic welding. After welding is completed, the ram of the welder rises, the welding jig is released from the clamp, the lower part of the work is carried in from the previous process by the shuttle transfer device, and the welded product is delivered to the next process. There is.

[0004]

However, in the above-described conventional welding process, after the operation of the shuttle transfer device is completed, the loader device descends to set the upper work 51 on the welding jig, and the loader device operates. After ascending and retreating to the outside of the interference, the workpieces 51 and 52 are clamped by the welding jig, and the ram of the welding machine descends to perform welding. Following the operation of the shuttle transfer device, the loader device is operated. Since the operation is started, the loss time of welding work is increased, the welding time is shortened, the investment amount of equipment is increased, and the maintainability is impaired.

The present invention has been made in view of such circumstances, and an object thereof is to shorten the cycle time of the welding process by reducing the loss time of the welding work and to improve the efficiency of the welding work. It is to provide a work transfer device for a welding machine.

[0006]

In order to solve the problems of the above-mentioned prior art, in the present invention, one of the works to be joined to each other is provided with a work receiving means in a vertically movable ram of a welding machine. A first transfer means for transferring the work to the welding jig of the welding machine is provided, and a second transfer means for transferring the other work to the ram of the welder is provided above the first transfer means. At the elevated position, the other work is received by the work receiving means from the second transfer means, and one work is set on the welding jig of the welding machine by the first transfer means, and the ram is moved down. The other work held by the work receiving means is set in the welding jig of the welding machine.

[0007]

[Working] In a work transfer device for a welding machine according to the present invention, a work receiving means is provided on a vertically movable ram of the welding machine, and first and second transfer means for transferring the works to be joined together to the welding machine. Since the work is received by the work receiving means from the second transfer means at the raised position of the ram and the work is set on the welding jig by the ram, the operation time of the first transfer means is increased. It is possible to finish the series of operations of the second transfer means therein, and at the same time when the ram is lowered, it is possible to position the marriage position (joint position) of the work and weld it.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

1 to 6 show an embodiment of a work transfer device for a welding machine according to the present invention. In the figure, reference numeral 1 is a multi-welding machine used in an automatic welding process of a work constituting a vehicle body of a four-wheeled vehicle, and the welding machine 1 is mounted on an upper frame 2 through a plurality of supporting rods 3 to move vertically. A possible ram 4 and a welding jig 6 provided on the lower table 5 facing the ram 4 are provided. Four columns 7 are installed between the upper frame 2 and the table 5.

A large number of welding guns 8 are provided on the lower surface of the ram 4.
Is attached, and a pair of front and rear support arms 9 and 10 are attached to the left and right so as to be openable and closable with the welding gun 8 interposed therebetween. These support arms 9 and 10 constitute a work receiving means, and hook-shaped hand portions 9a and 10a for gripping a work, which will be described later, are provided at the tips thereof, respectively. The welding jig 6 has a plurality of jig blocks 11 and 12 arranged at a predetermined interval, and a shuttle transfer device described later enters between the jig blocks 11 and 12 and is arranged. It has become so. Further, the welding jig 6 is provided with a clamp means (not shown), and the jig block 11,
The work set in 12 is clamped at the time of welding,
Alternatively, it can be unclamped after welding is completed.

Further, around the welding machine 1, a pair of upper and lower works (for example, an upper work is a rear floor panel assembly, a lower work is a rear floor member assembly) 13, which are connected to each other to form a vehicle body, Among the four, the lower work 14 is transported to the welding jig 6 by a shuttle transport device 15 as a first transport means, and above the shuttle transport device 15, the upper work 13 is transported to the ram 4 of the welding machine 1. And a loader position 16 which is a second transfer means for the shuttle transfer device 15 and the loader device 16 respectively.
And are arranged in directions orthogonal to each other.

The shuttle transfer device 15 is provided with a vertically movable work receiving portion 17 for holding the lower work 15, and the position of the previous process (not shown) in which the lower work 14 is arranged. And the welding jig 6 of the welding machine 1 are arranged so as to be reciprocally movable. Then, the shuttle transport device 1
5 moves forward with the work receiving portion 17 holding the lower work 14 rising, and lowers the work receiving portion 17 at a position between the jig blocks 11 and 12, thereby lowering the lower work 14 Is configured to be seated on the welding jig 6 and set.

On the other hand, the loader device 16 includes a guide rail 18 arranged at the same height as the upper frame 2 of the welding machine 1, a movable body 19 sliding on the guide rail 18, and the movable body. 19 and a loader body 21 that is vertically movable via a plurality of rods 20. The loader body 21 has a lower surface on which the upper workpiece 13 is attached.
A work hand 22 for gripping is attached so as to be openable and closable. A work storage 2 for storing the upper work 13a to be conveyed is provided below the loader device 16.
3 is provided corresponding to the work hand 22. For this reason, the work storage 23 is provided in the vicinity of the welding machine 1, and a large number of works 13a to be conveyed next are placed side by side on the upper surface portion thereof.

Thus, the loader device 16 is arranged so as to be reciprocally movable between the welding machine 1 and the work storage 23, and when the ram 4 is at the rising end position, the loader main body 2
1 enters below the ram 4 and transfers the upper work 13 gripped by the work hand 22 to the support arms 9 and 10. That is, the work transfer device of this embodiment is constituted by the support arms 9 and 10 of the arm 4 and the work hand 22 of the loader body 21. In the drawing, the arrow a direction is the work transfer direction of the shuttle transfer device 15, and the arrow b direction is the loader device 16.
The work transfer direction of is shown. 1 and 2
3, a chain line c indicates a position when the work 13 is conveyed by the loader device 16, a chain line d indicates a position when the work 13 is conveyed by the ram 4, and a chain line e indicates a setting position of the work 13 on the welding jig 6. ..

In the automatic welding process of the works 13 and 14 using the work transfer device of this embodiment, first, the work receiving portion 17 of the shuttle transfer device 15 receives the lower work 14 from the previous process at a position not shown. Rise. During this time, the loader device 16 holding the upper work 13 by the work hand 22 of the loader body 21 advances toward the upper frame 2 of the welding machine 1 (direction of arrow b) via the movable body 19. Next, the workpiece receiving portion 17 of the shuttle transport device 15 is directed toward the welding jig 6 of the welding machine 1 (arrow a).
Direction) and moves forward, and is arranged between the jig blocks 11 and 12. At the same time, the loader main body 21 enters below the ram 4 at the rising end position, and the upper work 13 gripped by the work hand 22 is moved to the support arms 9 and 10 on the ram 4 side.
(See Figure 3).

Further, the work receiving portion 17 of the shuttle transfer device 15 arranged between the jig blocks 11 and 12 is lowered, and the lower work 14 being held is seated on the welding jig 6 and set. .. During this time, the loader device 16 moves backward, and at any time during the backward movement, the loader main body 21 descends to take out the upper work 13 from the work storage 23 by the work hand 22, and then rises and waits at a predetermined position. ing. Then, after confirming that the lower work 14 is seated on the welding jig 6, the ram 4 is moved to the position shown in FIG.
As shown in FIG. 5, the supporting arms 9 and 1 are lowered in the order shown in FIG.
0 opens and the upper work 13 is released from the clamp, is superposed on the lower work 14 on the welding jig 6, is positioned at the marriage position, and both works 13, 14 are clamped to the welding jig 6 ( (See FIG. 6). The support arms 9 and 10 on the ram 4 side are open so as not to interfere with other members. Therefore, when the welding is over and the ram 4 rises, the support arms 9, 10 remain open.

In this state, a welding current is supplied to the welding gun 8, and along with this, the welding gun 8 welds and joins the predetermined positions of the joint surfaces of the upper and lower works 13, 14. Then, if the ram 4 rises after the completion of the predetermined welding, one cycle of this automatic welding process ends. When the ram 4 rises to the rising end and the upper work 13a conveyed by the loader device 16 enters the designated position, the support arms 9 and 10 are closed to move the upper work 13a from the work hand 22. It is received and clamped, and then the same operation as described above is repeated. During this period, the clamps of the works 13 and 14 set on the welding jig 6 are released, the lower work 14 is carried in from the previous process by the shuttle transfer device 15, and the welding-completed product is discharged. And sent to the next process.

In the automatic welding process using the work transfer device of this embodiment, the supporting arms 9 and 10 are mounted at the rising end of the ram 4.
However, since the upper work 13 is received from the work hand 22 of the loader device 16 and the ram 4 is lowered to set the upper work 13 on the welding jig 6, the operation time of the shuttle transfer device 15 is reduced. It is possible to finish the delivery of the upper work 13 to the ram 4 side, and at the same time the ram 4 is lowered, the upper work 13 can be positioned in the welding jig 6, thereby shortening the cycle time. Can be realized. This is obvious by comparing the time chart of the present embodiment shown in FIG. 7 with the time chart of the conventional example shown in FIG.

In FIG. 7, (1) is the raising of the shuttle transport device 15 and the advance of the loader device 16, and (2) is the advance of the shuttle transport device 15 and the loader device 16 to the ram 4.
Work transfer to the side, (3) lowering the shuttle transfer device 15 and retracting the loader device 16, (4) lowering the ram 4,
(5) shows the clamp of the welding jig 6, (6) shows welding by the welding gun 8, (7) shows the rise of the ram 4, and (8) shows the rise of the shuttle transport device 15. Further, in FIG. 8, (11) is the lift of the shuttle transfer device, (12)
Is the forward movement of the shuttle transport device, (13) is the downward movement of the shuttle transport device, (14) is the forward movement of the loader device, (15) is the lower loader device, (16) is the work set, and (17) is the upper loader device. , (18) shows the retracting of the loader device, (19) shows the descending of the ram, (20) shows welding by a welding gun, (21) shows the ascending of the ram, and (22) shows the ascending of the shuttle transfer device.

The embodiment of the present invention has been described above.
The present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention.

[0021]

As described above, in the work transfer device for the welding machine according to the present invention, the work receiving means is provided on the vertically movable ram of the welding machine, and among the works connected to each other,
The ram is provided with a first transfer means for transferring one work to a welding jig of the welding machine and a second transfer means for transferring the other work to a ram of the welder above the first transfer means. At the elevated position, the other work is received from the second transfer means by the work receiving means, and one work is set on the welding jig by the first transfer means.
Further, since the other work held by the work receiving means is set on the welding jig by further lowering the ram, the operation of the second transfer means can be performed within the operation time of the first transfer means. The other work can be positioned on the welding jig by the ram, and the operation time of the second transfer means required in addition to the operation time of the first transfer means in the conventional welding process It is possible to omit the work set time. Therefore, if the work transfer device of the present invention is used, the cycle time of the welding process can be shortened and the efficiency of the welding operation can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing a welding machine provided with a work transfer device according to an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a perspective view conceptually showing a ram of the welding machine in a state before receiving the work held by the loader device.

FIG. 4 is a perspective view conceptually showing a ram of the welding machine in a state where the work is received from the loader device.

FIG. 5 is a conceptual diagram showing an operation of a support arm provided on a ram of the welding machine.

FIG. 6 is a perspective view conceptually showing a state of welding a work positioned by a ram of the welding machine.

FIG. 7 is a time chart showing an automatic welding process using the work receiving device of the present embodiment.

FIG. 8 is a time chart showing a conventional automatic welding process.

FIG. 9 is a perspective view conceptually showing a work carried by a conventional carrying means.

[Explanation of symbols]

 1 Multi Welder 2 Upper Frame 3 Support Rod 4 Ram 5 Table 6 Welding Jig 8 Welding Gun 9,10 Support Arm 13,14 Work 15 Shuttle Transfer Device 16 Loader Device 18 Guide Rail 19 Movable Body 20 Rod 21 Loader Body 22 Work Hand 23 work storage

Claims (1)

[Claims] 1. A work receiving means is provided on a vertically movable ram of a welding machine, and a first transfer means is provided for transferring one of the works connected to each other to a welding jig of the welder. A second transfer means for transferring the other work to the ram of the welding machine is provided above the first transfer means, and the other work is received by the work receiving means from the second transfer means at the raised position of the ram. With
One work is set on the welding jig of the welding machine by the first conveying means, and the other work held by the work receiving means is set on the welding jig of the welding machine by lowering the ram. A work transfer device for a welding machine, which is characterized in that