JP2001321956A - Welding equipment for projection bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To weld a projection bolt composed of a shaft part, a flange and a projecting part for welding efficiently as much as possible, and also to realize the installation of an equipment by using an existing welding equipment and a robot device and modifying them readily as much as possible. SOLUTION: A movable electrode 10 and a fixed electrode 11 are mounted on supporting arms 8 and 9, respectively, of stationary type welding equipment 5, and an accepting port 13 for a shaft 2 is formed at either one of both electrodes. A supplying device 14 for the projection bolt is fixed on the stationary member of the stationary type welding equipment 5 and the supplying device 14 and both electrodes 10 and 11 are located in a state of plural pairs. The projection bolt 1 stops at a position where its shaft part 2 comes to be coaxial with the accepting port 13, and then the shaft part 2 is inserted into the accepting port 13. Thereafter a work 37 is transferred by the robot device 33 to a position between both electrodes and the welding of the projection bolt 1 and the work 37 is completed. During the welding work, plural pairs of electrodes operate simultaneously or alternately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Projection bolts comprising a shaft, a flange and a welding projection are welded to a plate-like work. The invention belongs to the technical field of such welding.

[0002]

2. Description of the Related Art Japanese Patent No. 2509103 is a prior art in the technical field as described above.
Here, it is disclosed that a receiving hole for inserting a shaft portion of the projection bolt is opened in the movable electrode, and the projection bolt held by the movable electrode is welded to a work such as a steel plate by the advance of the electrode.

[0003]

The above-described prior art plays a required role as a mechanism for inserting a projection bolt into a receiving hole of an electrode. However, no special consideration is given to increasing the productivity of the welding process. Furthermore, it is not satisfactory in terms of simplifying the equipment and reducing the equipment cost by modifying the existing equipment to a minimum. In particular,
Such requirements are very important when welding a projection bolt to a small steel work. Further, when the work enters between the two electrodes, care must be taken so as not to hinder the behavior of the work. On the other hand, it is impossible to insert the shaft portion of the bolt into the receiving hole of the electrode while the work is arranged between the two electrodes.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems and required conditions. In welding a projection bolt consisting of a welding projection formed on the side flange surface to a plate-like work, a movable electrode and a fixed electrode are respectively installed on a plurality of pairs of support arms installed on a stationary welding machine, A receiving hole into which the shaft portion is inserted is formed in one of the electrodes, and a projection bolt supply device is attached to a stationary member of the stationary welding machine. On the other hand, the work is held by a robot device and is placed between the two electrodes. It is characterized by being moved.

The shaft is inserted into each of the receiving holes of the electrodes from the projection bolt supply device attached to the stationary member of the stationary welding machine, and in this state, the work enters between the two electrodes by the robot function and the movable electrode is activated. Then, the welding protrusion and the work are pressed and the electric current and welding are performed. Since the two electrodes and the projection bolt supply device are installed as a plurality of pairs, multi-point bolt welding can be performed on one work, which is effective in increasing productivity. It is only necessary to modify the stationary welding machine so that it has more than one welding unit and to arrange a projection bolt supply device in conjunction with it, so existing facilities can be used to reduce equipment costs and simplify equipment. Can be achieved.
As described above, since the stationary member of the stationary welding machine and the projection bolt supply device are unitized, it is possible to complete the projection bolt welding to the target portion of the incoming work while supplying bolts to the electrodes. Can be. Therefore, a simple remodeling by simply attaching the projection bolt supply device to the existing stationary welding machine is sufficient. Further, since the existing robot device is used as it is, there is no economical problem in this respect.

According to a second aspect of the present invention, in the first aspect, the projection bolt supply device is disposed behind the electrode when viewed in the longitudinal direction of the support arm. By doing so, when the work enters between the two electrodes, the projection bolt supply device does not become an obstacle. This means that the work is first guided between the two electrodes because the two electrodes are arranged at the foremost portion of the support arm, so that welding can be performed smoothly without interference with other members.

According to a third aspect of the present invention, in the first or second aspect, the projection bolt supply device is configured to drive the holding head attached to the reciprocating supply rod and the shaft of the projection bolt into the receiving hole. It is characterized by being comprised from. As the retractable supply rod projects or retracts between the electrodes, the projection bolts locked on the holding head are successfully transferred between the electrodes. In particular, by stopping the supply rod from advancing at a position where the shaft is coaxial with the receiving hole, the shaft can be moved to the receiving hole accurately.
Since the shaft is inserted into the receiving hole at the output of the driving means, highly reliable supply can be performed following the advance of the supply rod.

According to a fourth aspect of the present invention, in the third aspect, the driving means is fixed to a stationary member of the stationary welding machine, and the feed rod advance / retreat driving means is fixed to the output member of the driving means. Are inclined in two directions with respect to the support arm, so that the projection stops at a position where the shaft of the projection bolt held by the holding head is coaxial with the receiving hole. It is characterized by being inserted into. Since the advancing / retracting driving means for the supply rod and the driving means for guiding the shaft to the receiving hole are provided, it is ensured that the bolt is moved between the electrodes and the shaft is inserted into the receiving hole. You. This behavior is realized particularly when the forward / backward drive means is fixed to the output member of the drive means. Furthermore, since the supply rod is inclined in two directions with respect to the support arm, it is possible to move the projection bolt between the two electrodes from the back of the electrode, and the projection bolt supply device is attached to the stationary member of the stationary welding machine. Can be easily performed.

[0009] The invention of claim 5 is the invention of claims 1 to 4.
In any one of the above, a plurality of pairs of movable electrodes, fixed electrodes, and projection bolt supply devices are separately arranged on both sides of a center line of the work. In this way, since a plurality of pairs of welding units can correspond to both sides of the work center line, each welding unit performs bolt welding simultaneously or alternately on both sides of the work, and a large number of bolt welds can be performed in a short time.

According to a sixth aspect of the present invention, there is provided a stationary welding machine for welding a projection bolt formed of a welding projection formed on a shaft portion, a flange, and a flange surface opposite to the shaft portion to a plate-like work. A movable electrode and a fixed electrode are respectively installed on the support arms installed in the above, a receiving hole into which the shaft part is inserted is formed in one of the two electrodes, and a projection bolt supply device is attached to a stationary member of the stationary welding machine. On the other hand, the work is configured to be held by the robot apparatus and moved between the two electrodes, and
The distance between the work and one of the electrodes is set so that the shaft portion can be inserted into the receiving hole by the projection bolt supply device while the work enters between the two electrodes.

Therefore, by positioning the work away from the electrode having the receiving hole or by keeping the work in contact with the electrode having no receiving hole, the bolt shaft portion can be received while the work is arranged between the two electrodes. And a large work can be supplied without moving a large work one by one. In this way, the welding efficiency is improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. The iron projection bolt is indicated by reference numeral 1 and includes a shaft portion 2, a circular flange 3 integral with the shaft portion 2, and a welding projection 4 formed on a flange surface opposite to the shaft portion 2. The welding protrusions may be provided in three or four warts.

Reference numeral 5 denotes a stationary welding machine, and supporting arms 8 and 9 are connected to a column 7 standing upright from a floor 6. A movable electrode 10 and a fixed electrode 11 are provided on each of the support arms 8 and 9, and the movable electrode 10 is driven by an air cylinder 12 attached to the support arm 8. A receiving hole 13 is formed in one of the electrodes 10 and 11, and the shaft portion 2 is inserted therein. Here, the receiving hole 13 is formed in the movable electrode 10 as is apparent from FIG. The air cylinder 12 can be replaced with an electric motor. In this case, a mechanism for converting a rotational motion into a linear motion is also used.

Reference numeral 1 denotes a projection bolt supply device.
The device is shown at 4 and is located behind the electrodes in the longitudinal direction of the support arm 8. That is,
The movable electrode 10 is attached to the tip of the support arm 8,
The supply device 14 is disposed behind the supply device, that is, on the right side in FIG. In other words, when the workpiece enters the stationary welding machine 5, the workpiece first enters between the electrodes 10, 11, and at this time, the supply device 14 does not interfere with the workpiece.

The movable electrode 10, the fixed electrode 11, and the projection bolt supply device 14 form a pair, which is installed in the stationary welding machine 5 in a plurality of pairs. For this purpose, a plurality of support arms 8 and 9 are provided on a column 7, and a movable electrode 10 and a fixed electrode 11 are provided respectively.
Are provided, and a plurality of projection bolt supply devices 14 for the receiving holes 13 of the respective electrodes are also arranged. In this embodiment, two sets are installed as is apparent from FIG.

A bracket 15 is fixed to the side surface of the column 7, and an air cylinder 16 as a driving means is attached to the bracket 15. Advancing / retracting driving means 19 of the supply rod 18 is fixed to a piston rod 17 corresponding to an output member of the driving means. This means 19 is constituted by an air cylinder, and the piston rod 17 and the air cylinder 19
Are integrated via a coupling bracket 20 attached to the main body. An electric motor may be used instead of the air cylinders 16 and 19. When an electric motor is employed, a mechanism for converting the rotation of the motor into a linear motion is interposed. The driving means 16 is attached to a stationary member of the stationary welding machine, and here, the side surface of the column is a stationary member.

The supply rod 18 is inclined in two directions with respect to the support arm 8 extending in the lateral direction. This inclination is set as an angle θ1 when viewed in the direction of FIG. 1 and as an angle θ2 when viewed in the direction of FIG. That is, the supply rod 18 crosses the support arm 8 obliquely. A holding head 21 is connected to the tip of the supply rod 18, and the shaft 2 of the projection bolt held here is inserted into the receiving hole 1 when the holding head 21 advances.
It is configured to be coaxial with the third axis.

The axis of the holding head 21 is aligned with the supply rod 18.
At an acute angle with respect to the axis. Head body 22
Is formed with a circular concave portion 23 which is opened upward, and the flange 3 is accommodated therein. Since the welding projection 4 is integrated with the flange 3, a large-diameter portion 23 a for the flange 3 and a small-diameter portion 23 b for the welding projection 4 are formed in the concave portion 23 in order to accommodate them. ing. Recess 2
A magnet (permanent magnet) 24 is buried in the back of the projection 3 and sucks the flange 3 in the recess 23 to hold the projection bolt 1 in a stable state. In this state, as shown in FIG. 3, the outer peripheral portion of the flange 3 is in close contact with the bottom surface of the large-diameter portion 23a.

An air passage 25 is opened at the center of the head body 22 and opens at the bottom of the small diameter portion 23b. With the compressed air from the air passage 25, the flange 3 is forced out of the recess 23 against the attraction force of the magnet 24, and the shaft 2 is completely moved to the receiving hole 13. The compressed air is supplied when a part of the shaft 2 enters the receiving hole 13. Reference numeral 26 denotes an air hose connected to the air passage 25, and reference numeral 27 denotes a magnet (permanent magnet) installed at the back of the receiving hole 13, which reliably sucks and holds the bolt 1 transferred into the receiving hole 13. ing. If the upside down of FIG. 3 is reversed, stable bolt holding by the magnet 27 is performed.

When the supply rod 18 is retracted,
It is necessary to allow the flange 3 to enter the recess 23. For this purpose, the support piece 28 is fixed to the bracket 20, the component supply pipe 29 is connected to the support piece 28, and the end of the support piece 28 matches the holding head 21 (represented by the two-dot chain line in FIG. 2). The component supply pipe 29 is connected to a parts feeder 30 and is conveyed to the holding head 21 by compressed air from an air hose 31.

The robot device 33 is an ordinary general-purpose robot, and is of a six-axis type. Air cylinder 3 on joint joint 34
5 are coupled, and a chuck mechanism 36 is attached to the tip thereof. The workpiece 37 made of a steel plate includes a chuck mechanism 36.
Is firmly pinched. The workpiece 37 held by the robot device 33 is separated from the electrode 10 having the receiving hole 13 as shown in FIG.
Is in contact with the fixed electrode 11, or
Into a position where a slight gap is created between them. The reason for moving the work 37 into such a position is as follows.
This is because the projection 2 can be inserted into the receiving hole 13 by the projection bolt supply device 14 while the work 37 enters between the electrodes 10 and 11. Therefore, the interval between the work 37 and one of the electrodes is set so that the shaft portion 2 can be inserted.

The operation of the above embodiment will be described. When the holding head 21 is at the position shown by the two-dot chain line in FIG. 2, the projection bolt 1 is sent from the parts feeder 30. Then, the flange 3 and the welding projection 4 of the bolt are housed in the concave portion 23, and the shaft portion 2 projects upward from the holding head 21. Next, the supply rod 18 is advanced, and the advance of the supply rod 18 is stopped at a position where the shaft portion 2 is coaxial with the receiving hole 13. Thereafter, when the entire supply rod 18 is moved by the action of the air cylinder 16, the shaft 2 enters the receiving hole 13, and the shaft 2, that is, the projection bolt 1 is completely received by the compressed air from the air passage 25. After entering the hole 13, the magnet 27
Is used for suction holding. Then, the holding head 21 returns to the original position through a trajectory opposite to the above.

Next, the work 37 located at a position distant from the stationary welding machine 5 is gripped by the chuck mechanism 36 and enters between the electrodes 10 and 11 by the function of the air cylinder 35 and the like. At this time, the work 37 is stopped at a position in contact with the fixed electrode 11 as shown by a two-dot chain line in FIG. Thereafter, the movable electrode 10 advances and the welding projection 4
Is pressed into contact with the work 37, and then electricity is supplied.
7, the projection bolt 1 is welded. Such welding is performed simultaneously or alternately on both sides of the center line O of the work 37 by a plurality of pairs of units. Also,
Thereafter, when the next shaft portion 2 is inserted into each of the receiving holes 13 and the robot moves, the position of the work 37 is shifted, the next welding portion corresponds to the electrode, and bolt welding is performed again. After completion of the welding of a plurality of scheduled bolts in this manner, the work 37 is moved by the operation of the robot device 33 to the both electrodes 1.
It is retracted from between 0 and 11 and bolt welding to the work is completed. Thereafter, the entire work 37 is transferred to the next step.

When the work 37 is kept in contact with the fixed electrode 11 as shown in FIG. 2, the bolt welding is completed and the movable electrode 10 is retracted upward, so that the holding head 21 holds the bolt 1 again while holding the bolt 1. After entering, the shaft 2 is inserted into the receiving hole 13 and held by the movable electrode 10. That is, the space between the workpiece 37 and the movable electrode 10 is ensured so that the shaft portion can be inserted by the holding head 21.

Note that the present invention can be established even if the vertical relationship of the illustrated embodiment is reversed. In addition, since the stationary member of the stationary welding machine includes a support arm, a projection bolt supply device may be attached to a side surface of the arm.

[0026]

According to the present invention, there is provided a stationary type welding method for welding a projection bolt formed of a welding projection formed on a shaft portion, a flange and a flange surface opposite to the shaft portion to a plate-like work. A movable electrode and a fixed electrode are respectively installed on a plurality of pairs of support arms installed on the welding machine, a receiving hole into which the shaft is inserted is formed in one of the two electrodes, and a projection bolt is provided on a stationary member of the stationary welding machine. The supply device is attached, while the workpiece is held by the robot device and moved between the two electrodes.

The shaft is inserted into each of the receiving holes of the electrodes from the projection bolt supply device attached to the stationary member of the stationary welding machine, and in this state, the workpiece enters between the two electrodes by the robot function and the movable electrode is activated. Then, the welding protrusion and the work are pressed and the electric current and welding are performed. Since the two electrodes and the projection bolt supply device are installed as a plurality of pairs, multi-point bolt welding can be performed on one work, which is effective in increasing productivity. In particular, since electrodes and bolt supply devices are installed in a plurality of pairs, welding progresses simultaneously or alternately at a plurality of locations on the work, and the moving distance of the work by the robot device is also short due to the plurality of pairs. Therefore, a large number of projection bolts can be welded in a short welding time, which is very advantageous for improving productivity.

It is sufficient to modify the stationary welding machine so as to have a plurality of welding units, and to arrange a projection bolt supply device in accordance therewith. Can be simplified. As described above, since the stationary member of the stationary welding machine and the projection bolt supply device are unitized,
The projection bolt welding can be completed at the target portion of the incoming work while supplying bolts to the electrodes. Therefore, a simple remodeling by simply attaching the projection bolt supply device to the existing stationary welding machine is sufficient. Further, since the existing robot device is used as it is, there is no economical problem in this respect.

The projection bolt supply device is disposed behind the electrode when viewed in the longitudinal direction of the support arm. By doing so, when the work enters between the two electrodes, the projection bolt supply device does not become an obstacle. This means that the work is first guided between the two electrodes because the two electrodes are arranged at the foremost portion of the support arm, so that welding can be performed smoothly without interference with other members. This is very important for avoiding the interference problem when the shape of the work is complicatedly bent.

The projection bolt supply device is composed of a holding head attached to a reciprocating supply rod and driving means for inserting the shaft of the projection bolt into a receiving hole. As the retractable supply rod projects or retracts between the electrodes, the projection bolts locked on the holding head are successfully transferred between the electrodes. In particular, by stopping the supply rod from advancing at a position where the shaft is coaxial with the receiving hole, the shaft can be moved to the receiving hole accurately. Since the shaft is inserted into the receiving hole at the output of the driving means, highly reliable supply can be performed following the advance of the supply rod.

The drive means is fixed to a stationary member of the stationary welding machine, and the output member of the drive means has a feed rod advance / retreat drive means fixed thereto. The supply rod is inclined in two directions with respect to the support arm. With this arrangement, the shaft of the projection bolt held by the holding head is stopped at a position coaxial with the receiving hole, and the shaft is inserted into the receiving hole from the stopped position. Since the advancing / retracting driving means for the supply rod and the driving means for guiding the shaft to the receiving hole are provided, it is ensured that the bolt is moved between the electrodes and the shaft is inserted into the receiving hole. You. This behavior is
In particular, this is realized by the advance / retreat driving means being fixed to the output member of the driving means. Furthermore, since the supply rod is inclined in two directions with respect to the support arm, it is possible to move the projection bolt between the two electrodes from the back of the electrode, and the projection bolt supply device is attached to the stationary member of the stationary welding machine. Can be easily performed.

A plurality of pairs of movable electrodes, fixed electrodes, and projection bolt supply devices are distributed on both sides of the center line of the work. As described above, since a plurality of pairs of welding units can correspond to both sides of the work center line, each welding unit simultaneously or alternately performs bolt welding on both sides of the work, and furthermore, the moving distance of the work by the robot device is shortened. Many bolts can be welded in a short time.

A projection bolt formed of a welding projection formed on a shaft portion, a flange, and a flange surface opposite to the shaft portion is welded to a plate-like work. A movable electrode and a fixed electrode are installed, a receiving hole into which the shaft is inserted is formed in one of the two electrodes, and a projection bolt supply device is attached to a stationary member of a stationary welding machine. And the workpiece can be moved between the two electrodes, and the workpiece can be inserted into the receiving hole by a projection bolt supply device while the workpiece has entered between the two electrodes. An interval with one of the electrodes is set.

Therefore, by positioning the work away from the electrode having the receiving hole, or by keeping the work in contact with the electrode having no receiving hole, the bolt shaft portion can be inserted into the receiving hole while the work is arranged between the electrodes. And a large work can be supplied without moving a large work one by one. In this way, the welding efficiency is improved.

[Brief description of the drawings]

FIG. 1 is an overall plan view showing an embodiment of the present invention.

FIG. 2 is a side view of that of FIG.

FIG. 3 is a vertical sectional side view showing a relationship between a holding head and a receiving hole.

FIG. 4 is a side view showing an appearance of a projection bolt.

[Explanation of symbols]

 2 Shaft 3 Flange 4 Welding projection 1 Projection bolt 37 Work 5 Stationary welding machine 8, 9 Support arm 10 Movable electrode 11 Fixed electrode 13 Receiving hole 14 Projection bolt supply device 33 Robotic device 18 Supply rod 21 Holding head 16 Drive means 17 output member 19 forward and backward driving means

Claims (6)

[Claims] 1. A welding method comprising: welding a projection bolt formed of a welding projection formed on a shaft portion, a flange, and a flange surface opposite to the shaft portion to a plate-like work; A movable electrode and a fixed electrode are respectively installed on the support arms, a receiving hole into which the shaft is inserted is formed in one of the two electrodes, and a projection bolt supply device is attached to a stationary member of the stationary welding machine, and And a workpiece is held by a robot device and moved between the two electrodes. 2. The projection bolt welding device according to claim 1, wherein the projection bolt supply device is disposed behind the electrode when viewed in the longitudinal direction of the support arm. 3. The projection bolt supply device according to claim 1, wherein the projection bolt supply device includes a holding head attached to a reciprocating supply rod and a driving unit for inserting a shaft of the projection bolt into a receiving hole. Welding equipment for projection bolts. 4. A driving device according to claim 3, wherein the driving means is fixed to a stationary member of the stationary welding machine, and an output member of the driving means is fixed to an advancing / retracting driving means of the supply rod. The projection bolt held by the holding head stops at a position coaxial with the receiving hole, and the shaft is inserted into the receiving hole from the stopped position. Projection bolt welding equipment characterized by the following. 5. The projection according to claim 1, wherein a plurality of pairs of a movable electrode, a fixed electrode, and a projection bolt supply device are distributed on both sides of a center line of the workpiece. Bolt welding equipment. 6. A support arm installed in a stationary welding machine, wherein a projection bolt formed of a welding projection formed on a shaft portion, a flange, and a flange surface opposite to the shaft portion is welded to a plate-like work. A movable electrode and a fixed electrode are installed in each, a receiving hole into which the shaft is inserted is formed in one of the two electrodes, and a projection bolt supply device is attached to a stationary member of the stationary welding machine.
The work is configured to be held by the robot device and moved between the two electrodes, and further, the shaft portion can be inserted into the receiving hole by the projection bolt supply device while the work enters between the two electrodes. Wherein the distance between the work and one of the electrodes is set.