JPH0224554Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a robot jig used for projection welding of nuts.

(Prior art) Conventionally, when projection welding a nut to a workpiece (for example, a steel plate), the workpiece was carried into a stationary welding machine by a robot, and the nut guide pin located at the center of the welding machine's electrode was connected to the workpiece. The nut is inserted into the hole and the threaded hole of the nut supplied from the nut feeder for positioning.Then, the upper electrode is lowered to apply pressure and current is passed, and the heat generated at that time welds the nut and the workpiece. Completed workpieces were carried onto a chute and discharged outside.

In the above process of welding the workpiece and the nut, the nut guide pin of the welding machine is inserted into the hole in the workpiece, but since the diameter of the hole in the workpiece is small, the robot is required to have high stopping accuracy. Therefore, in order to maintain high stopping accuracy, electric robots and PTP control were adopted.

(Problem that the invention aims to solve) However, in the current era where technological innovation progresses at a rapid pace, products are becoming more and more complex year by year, and as a result, the parts to be welded are also becoming more complex and diverse. We had to respond to the needs of users and the era of high quality, and the stopping accuracy of the robots introduced a few years ago could not keep up with the trends of the times, and we had no choice but to dispose of them, resulting in inefficient capital investment.

Therefore, the present invention is to provide a jig for a robot that can accurately position a workpiece at a predetermined position even if the robot's stopping accuracy is poor by attaching the jig to the robot with poor stopping accuracy as described above. .

(Means for solving the problem) In order to achieve the above object, the present invention is attached to a robot arm, holds a workpiece, moves it into a stationary welding machine, and places the workpiece at a predetermined position relative to the electrode of the welding machine. This is a robot jig for welding a projection nut for positioning, and includes a jig body formed in a U-shape, a workpiece placement surface is provided on the upper surface of the jig body, and a workpiece is placed on the workpiece placement surface. A pair of first taper pins for positioning are provided protrudingly, and a pair of second taper pins are protrusively provided on the lower surface of the jig body to engage with positioning holes provided in the welding machine. That is.

(Function) Since the present invention has the above-mentioned configuration, a workpiece is set in a predetermined position on the jig body, the workpiece set in the predetermined position is moved together with the jig body to the electrode side of the welding machine, and the welding machine A taper pin provided on the lower surface of the jig body is engaged with the positioning hole on the base of the jig, thereby positioning the jig body, that is, positioning the workpiece relative to the electrode. Welding work will be carried out.

(Embodiment) First, an embodiment of the present invention will be described based on FIGS. 1 and 2. Reference numeral 1 denotes a jig body, and a connecting member to which the robot arm 3 is connected to the front wall of the jig body 1. 2 is permanently installed. The jig main body 1 has a substantially U-shape when viewed from above, and a pair of first taper pins 6a, 6b for positioning the workpiece 5 are protruded from the workpiece mounting surfaces 4a, 4b at both ends of the upper surface. has been done.

A pair of second taper pins 11a, 11b protrude from both ends of the lower surface of the jig main body 1, respectively, to engage with positioning holes 7a, 7b on the side of a stationary welding machine 9, which will be described later.

Further, the stationary welding machine 9 for welding the workpiece 5 is equipped with an electrode 12 as shown in FIGS. 3 and 4, and a nut guide pin 13 is provided protruding from the center of the electrode 12. Further, the welding machine 9 is provided with a base 10 extending in the horizontal direction, and the base 10 engages with second taper pins 11a and 11b provided on the jig body 1 to position the jig body 1. hole 7
The second taper pin 11 of the jig body 1 is used to fix the pipe 7 having the pipes a and 7b and to weld another nut 15' (FIG. 2) on the same workpiece 5.
A tube 8 having holes 8a and 8b for positioning the jig main body 1 by engaging with the holes 8a and 11b is also fixed.

Further, a nut feeder 14 for feeding nuts 15 toward the electrode 12 is provided.

A first taper pin 6 provided on the workpiece mounting surfaces 4a and 4b of the jig main body 1 fixed to the robot.
Positioning holes 16a and 6b formed in the workpiece 5,
16b and placed on the mounting surface to determine its position, the robot transports it to the stationary welding machine 9 and starts the robot to attach the second taper pins 11a and 11b provided on the jig body 1 to the stationary welding machine 9. base 1
It operates to insert into the positioning holes 7a and 7b arranged on 0. Also, the second taper pin 11a, 1
Since the protrusion 17 (FIG. 1) of 1b is longer than the protrusion 18 (FIG. 4) of the nut guide pin 13 located at the center of the electrode 12, the second taper pin 11
a, 11b are inserted into the positioning holes 7a, 7b, and the nut guide pin 13 is engaged with the nut hole 19 of the workpiece 5 with the jig positioned.

Next, remove the nut guide pin 1 from the nut feeder 14.
3. Supply nut 15 towards work 5.
position on the nut hole 19 of. Next, the upper electrode (not shown) is lowered to apply pressure, and then electricity is applied, and the heat generated at that time causes the nut 1 to tighten.
5 and the workpiece 5 are welded together. Note that, if necessary, the second taper pins 11a, 11b are inserted into other positioning holes 8a, 8b to change the position of the hitting point, and another nut 15' is welded to the workpiece 5.

Furthermore, after the work is completed, the robot returns to its original position and lowers the arm 3 of the robot, and the workpiece 5 hits the chute 20 as shown in FIGS. It slides down and is ejected outside.

If the diameter or type of the nut is different, it can be handled by using a stationary welding machine according to the diameter or type of the nut as shown in FIG.

The jig of this embodiment has a very simple shape, so the manufacturing cost is low and maintenance is easy.

(Effects of the invention) As explained above, the present invention uses the first and second taper pins provided on the jig body to place the workpiece in the jig body and the jig body in the welding machine with high precision. The workpiece can be positioned with high accuracy relative to the electrode of the welding machine even if a robot with somewhat inferior stopping accuracy is used. Therefore, the period during which the robot can be used is extended and its service life is increased, thereby eliminating wasteful investment in equipment and improving economic efficiency.

In addition, the jig is small, compact, and has a simple shape, so the manufacturing cost is low. Therefore, it is easy to manufacture many types of jigs, and various types of jigs and stationary welding machines can be combined as necessary. This results in effects such as being able to sufficiently respond to complex welding work.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the workpiece set in the jig of the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a plan view of the positioning part provided in the welding machine, and Fig. 4 is a plan view of the positioning part provided in the welding machine.
The figure is a front view of Fig. 3, Fig. 5 is a side view of the jig of the present invention showing the state in which the chute is attached, and Fig. 6 is a front view of Fig. 5.
The plan view of the figure, FIG. 7, is a diagram showing an application example of FIG. 3. 1...Jig body, 3...Robot arm, 4
a, 4b...Work placement surface, 7a, 7b...Positioning hole, 11a, 11b...Second taper pin.

Claims (1)

[Scope of utility model registration request] A robot jig for welding projection nuts that is attached to a robot arm, holds a workpiece, moves it into a stationary welding machine, and positions the workpiece at a predetermined position relative to the electrode of the welding machine, and is formed in a U-shape. A jig main body, a work placement surface provided on the upper surface of the jig main body, a pair of first taper pins protruding from the work placement surface for positioning the work, and the jig main body A robot jig for welding a projection nut, characterized in that a pair of second taper pins protruding from the lower surface thereof are engaged with positioning holes provided in the welding machine.