JP2001314976A - Apparatus for welding projection bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for welding a projection bolt making use of an existing welding apparatus or a robot device with as simple as possible remodeling. SOLUTION: A movable electrode 10 and a fixed electrode 11 are respectively mounted to supporting arms 8, 9 of a stationary type welding machine 5, and a hole 13 for receiving the shaft portion 2 is formed on either one out of both electrodes. And a projection bolt supplying apparatus 14 is mounted to the supporting arm 9, a projection bolt stops at the position where the shaft portion 2 becomes coaxial with the receiving hole 13, a after that, the shaft portion 2 is inserted into the receiving hole 13. Then, a work 37 is transferred between both electrodes by the robot device 33, welding for the projection bolt and the work 37 is completed.

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, it is not satisfactory from the viewpoint of minimizing the existing equipment to simplify the equipment and reduce the equipment cost. In particular, when a projection bolt is welded to a small work made of a steel plate, such a requirement becomes very important. Further, when the work enters between the two electrodes, care must be taken so as not to hinder the behavior of the work.

[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 installed on a support arm of a stationary welding machine, and one of the two electrodes is provided. A receiving hole into which the shaft portion is inserted is formed, and a projection bolt supply device is attached to the support arm, while the work is held by the robot device and moved between the two electrodes.

[0005] The shaft is inserted into the receiving hole of the electrode from the projection bolt supply device attached to the support arm,
In this state, when the workpiece enters between the two electrodes by the robot function and the movable electrode is activated, the welding projection and the workpiece are pressed against each other to conduct and weld. As described above, since the support arm and the projection bolt supply device are unitized, the projection bolt welding can be completed at the target portion of the workpiece that enters 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.

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 from the support arm, the projection bolt locked to the holding head is 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,
Following the advance of the supply rod, highly reliable supply can be performed.

According to a fourth aspect of the present invention, in the third aspect, the driving means is fixed to the support arm, and the driving member for moving the supply rod forward and backward is fixed to the output member of the driving means. In two directions,
Thereby, 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 forward and backward drive means for the supply rod and the drive means for guiding the shaft to the receiving hole are installed,
It is ensured that the bolt is moved between the electrodes and that the shaft is inserted into the receiving hole.
This is realized by the forward / backward drive means being fixed to the output member of the drive means. Further, 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 rear of the electrode, so that the projection bolt supply device is unitized in the support arm. It will be easier.

[0009] The invention of claim 5 is the invention of claims 1 to 4.
In any one of the above, the workpiece held by the robot device is in contact with the welding projection of the projection bolt inserted into the receiving hole and the position separated from the electrode having the receiving hole between the two electrodes, or a small gap. It is characterized in that it can be moved so as to take at least two of the formation positions. By separating the work from the electrode with the receiving hole, it is possible to supply the projection bolt to the receiving hole while the work is located between the two electrodes. Therefore, since the first projection bolt can be continuously welded to the second projection bolt or the third projection bolt after the first projection bolt is welded, it is very advantageous for improving efficiency.

[0010]

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. 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.
This device is shown at 4 and is located behind the electrodes when viewed in the longitudinal direction of the support arm 9. That is,
The fixed electrode 11 is attached to the tip of the support arm 9,
The feeding device 14 is disposed behind the feeding device, that is, on the left side of 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.

A bracket 15 is fixed to a side surface of the support arm 9, 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 connecting bracket 20 attached to the air cylinder 19. An electric motor may be used instead of the air cylinders 16 and 19. When using an electric motor,
A mechanism for converting the rotation of the motor into a linear motion is interposed.

The supply rod 18 is inclined in two directions with respect to the support arm 9 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 9 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 recess 23 opened downward, 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. 4, 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 state of FIG. 4 is upside down, the bolt holding by the magnet 27 is indispensable.

When the supply rod 18 is retracted,
It is necessary to allow the flange 3 to enter the recess 23. For this purpose, a component supply pipe 29 is connected to a bracket 28 fixed to the side surface of the support arm 9, and an end of the supply pipe 29 coincides with the restored holding head 21 (shown by a two-dot chain line in FIG. 1). The parts supply pipe 29 is connected to the parts feeder 30 and is supplied with compressed air from the air hose 31 by the holding head 21.
Transported to

The robot device 33 is an ordinary general-purpose robot, and is of a six-axis type. An arm 35 is connected to the joint joint 34, and a chuck mechanism 36 is attached to a tip of the arm 35. The work 37 made of a steel plate is firmly held by the chuck mechanism 36. The workpiece 37 held by the robot device 33 is located at a position separated from the electrode 11 into which the shaft portion 2 is inserted as shown in FIG. 1 and a welding projection 4 of a bolt inserted into the receiving hole 13 although not shown. Or at least two positions: a position where a small gap is formed between the contact and the welding projection 4.

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. 1, the projection bolt 1 is sent from the parts feeder 30. Then, the flange 3 and the welding projection 4 of the bolt are accommodated in the concave portion 23, and the shaft portion 2 projects downward 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. It enters the hole 13. Then, the holding head 21 returns to the original position through a trajectory opposite to the above.

Then, the work 37 located at a position distant from the stationary welding machine 5 is grasped by the chuck mechanism 36 and enters between the electrodes 10 and 11. At this time, the work 37 is stopped at a position away from the fixed electrode 11 as shown by a two-dot chain line in FIG. Then, the work 37 is lowered and brought into contact with the welding projection 4 of the bolt held in the receiving hole 13. Then, the movable electrode 10 advances and the power is supplied, and the projection bolt 1 is welded to the work 37. After the welding is completed, the shaft portion 2 is pulled out of the receiving hole 13 by the operation of the robot device 33, and the work 3
7 is transferred to the next step.

When one projection bolt 1 is welded and the work 37 retreats upward, the supply rod 18 advances again and inserts the bolt 1 into the receiving hole 13. In this state, the workpiece 37 changes its position in the horizontal direction and then descends, and the second projection bolt welding is performed. That is, the work 37 is connected to both electrodes 10 and 11.
The welding of the projection bolts continues one after another in a state of being installed between them.

Such a continuous welding is not described in the claims, but can be described in the claims. By enabling continuous welding, the movement trajectory of the work 37 can be shortened, which is effective in increasing efficiency. Note that the same operation can be obtained even when the vertical relationship of the entire apparatus in FIG. 1 is reversed.

[0023]

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 installed on a support arm of the machine, 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 the support arm, and the workpiece is a robot device. And is moved between the two electrodes.

Inserting the shaft into the electrode receiving hole from the projection bolt supply device attached to the support arm,
In this state, when the workpiece enters between the two electrodes by the robot function and the movable electrode is activated, the welding projection and the workpiece are pressed against each other to conduct and weld. As described above, since the support arm and the projection bolt supply device are unitized, the projection bolt welding can be completed at the target portion of the workpiece that enters 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.

Since the projection bolt supply device is disposed behind the electrodes as viewed in the longitudinal direction of the support arm, when the work enters between the two electrodes, the projection bolt supply device may interfere with the work. do not do.
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.

The projection bolt supply device is composed of a holding head attached to the reciprocating supply rod and a driving means for inserting the shaft of the projection bolt into the receiving hole. As they protrude or retreat, the projection bolts locked on the holding head are successfully transferred between the electrodes. In particular, by stopping the advancement of the supply rod at a position where the shaft is coaxial with the receiving hole,
Shaft movement to the receiving hole is accurately performed. 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 the support arm, and the supply rod advance / retreat drive means is fixed to the output member of the drive means, and the supply rod is inclined in two directions with respect to the support arm. The shaft of the projection bolt held by the head stops 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 realized particularly when the forward / backward drive means is fixed to the output member of the drive means. Further, 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 rear of the electrode, so that the projection bolt supply device is unitized in the support arm. It will be easier.

The workpiece held by the robot device contacts the welding projection of the projection bolt inserted into the receiving hole and the position separated from the electrode having the receiving hole between the two electrodes, or forms a slight gap. Moved to take at least two of the positions. By separating the work from the electrode with the receiving hole, it is possible to supply the projection bolt to the receiving hole while the work is located between the two electrodes. Therefore, since the first projection bolt can be continuously welded to the second projection bolt or the third projection bolt after the first projection bolt is welded, it is very advantageous for improving efficiency.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a projection bolt supply device.

FIG. 3 is a perspective view showing a part of the projection bolt supply device.

FIG. 4 is a vertical sectional side view showing a relationship between a holding head and a receiving hole.

FIG. 5 is a side view showing the appearance of the projection bolt.

[Explanation of symbols]

 2 Shaft 3 Flange 4 Welding projection 1 Projection bolt 37 Work 5 Stationary welding machine 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 Driving means 17 Output Member 19 advance / retreat driving means

Claims (5)

[Claims] 1. A 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, wherein the projection bolt is movable to a support arm of a stationary welding machine. An electrode and a fixed electrode are provided, 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 support arm, while the work is held by a robot device and A projection bolt welding apparatus, which is moved between both 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. The driving device according to claim 3, wherein the driving means is fixed to the support arm, and the output member of the driving means is fixed to the supply rod advance / retreat driving means, and the supply rod is inclined in two directions with respect to the support arm. The projection is stopped at a position where the shaft of the projection bolt held by the holding head is coaxial with the receiving hole, and the shaft is inserted into the receiving hole from the stopped position. Bolt welding equipment. 5. The workpiece according to claim 1, wherein the workpiece held by the robot device is located at a position separated from an electrode having a receiving hole between the two electrodes and a projection bolt inserted into the receiving hole. A welding apparatus for a projection bolt, wherein the welding apparatus is moved to take at least two positions of contacting a welding projection or forming a small gap.