JPH01278974A - Spot welding electrode for projection bolt or the like - Google Patents

Abstract

PURPOSE:To prevent danger and to improve working efficiency by advancing an operating rod to a bolt, etc., on standby at the prescribed position and engaging its tip with the bolt, etc., and subsequently, drawing the bolt, etc., into holes by the retreat of the operating rod. CONSTITUTION:The operating rod 24 is inserted in a movable state into a guide hole 23 provided on the central part of an electrode 11 and an engaging structure is provided on its tip. When the operating rod 24 advances and attains an end of the bolt 1 after passing through the hole 9, the bolt 1 is engaged by the engaging structure of the operating rod 24. When the operating rod 24 is then retreated, the bolt 1 is separated from a supply rod 17 and drawn into the hole 9 and the guide hole 23 and a movable electrode advances to a place where a flange part 2 is stuck to a steel plate part 3 to complete spot welding. By this method, the bolt 1 can be smoothly drawn into the holes and the danger is prevented and the working efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an electrode for spot welding such as a projection bolt. Fig. 1111 shows a case where the flange part 2 of the projection bolt 107 is welded to the steel plate part 3 at the welding part 4, and Fig. 12 shows the case where the cylindrical nut 5 is welded to the welding part 4 at the 7 flange part 6. 7t- to the steel plate part 8, and in both cases, the steel plate part has a circular hole 9.101-Page 9. The present invention is a spot welding electrode used in these cases. It is related to.

(b) Conventional technology When welding a projection bolt, etc. to a steel plate part as shown in Figures 11 and 12, the steel plate part is fixed with the hole in the steel plate part aligned with the guide hole of the fixed electrode. It is placed on the electrode and then a worker manually inserts a projection bolt or the like into the electrode, and the bolt part and nut f1 are inserted into the hole or guide hole.

(C) Invention Point 151J1 Problems to be Solved In the above-mentioned conventional technology, one worker manually handles the product, so piping and jig mechanisms are complicated and complicated. In such a place, it is very dangerous, and at the same time, the work efficiency is extremely low @Also. This is because the tip of the bolt is inserted by pushing it into the hole in the steel plate component or the guide hole in the fixed electrode.

The tips of bolts tend to shift from the axis of the hole.

If it rubs even a little, it will interfere with the periphery of the hole, making it impossible to insert it smoothly. In a method in which a projection bolt or the like is inserted into a hole in a steel plate component or a guide hole in a fixed electrode, and the bolt or the like is welded to the steel plate component on the fixed electrode, the actuating rod is placed in a state in which it can move forward or backward into the guide hole. is inserted, and its tip is provided with a VC engagement groove structure, so that the engaged bolt, etc. is drawn into the hole of the steel plate component or the guide hole as the actuating rod retreats. There are 11 signs.

The actuating rod advances to a bolt or the like that is waiting at a predetermined position, its advance engages with the bolt, etc., and then, as the actuating rod retreats, it is retracted into both holes.

(e) Example This example uses a projection bolt, hereinafter referred to simply as a bolt. Figure 9 is an external view showing the entire spot welding machine in which the electrode of the present invention is adopted. A steel plate component 3 is placed on a fixed electrode 11 with the assistance of a support stand 12 and a positioning bin 16.

A large number of bolts 1 are housed in a vibrating parts figure 14, and are fed into a holding box 16 through a supply chute 15 extending from there.
A supply rod 17 passes through this, and this supply rod 17 is moved forward and backward by a fly air cylinder 18. When the supply rod 17 is extended, the pol b' in the holding box 16
As an example of the 0 supply rod 17 that locks 6 and transfers the bolt 1 with the cylinder on the axis of the movable electrode 19 and stops there, various types can be adopted, such as one equipped with a chuck mechanism at the tip. Now, as shown in Fig. 10, the supply rod 17 has a double structure consisting of the inner rod 20 and the actuator rod 21, and a magnet (
The bolt 1 is attracted by the permanent magnet) 22, and only the inner rod 20 is moved back, and the magnet 22t-bolt 1 is
Next, the internal structure of the fixed electrode 110 will be explained with reference to FIG.
An operating rod 24t is inserted into the 0-actuating rod 24t so as to be able to move forward and backward, and an engagement structure to be described later is provided at the tip end of the operating rod 24t. The piston rod is the actuating rod. Note that the fixed electrode 11 and the air cylinder 25 are firmly connected as shown in the figure.

As shown in wc1 figure and figure 9, the steel plate part 3 is the positioning bin 1.
3 is suitable for multi-slot welding machines with a large number of electrodes, and the positioning bin does not protrude from the fixed electrode. This is to ensure that a large number of holes 9 are aligned with the guide holes 23 of the fixed electrode at the same time. In the case of such multi-spots, f1
! The moving rod 24Fi should normally be moved back as shown in Fig. 1 and left waiting at the next position. When the bolt 1Fi is engaged by the engagement structure of the actuating rod 24 and then the actuating rod 24 is retracted, the bolt 1 is pulled away from the supply rod 17 and into the hole 9 and the guide hole 23, and
The movable electrode 19 advances to the place where the movable electrode 19 is in close contact with the steel plate component 3, and the spot welding is completed.

FIG. 2 shows an embodiment in which a function equivalent to one positioning pin 13 is given to the fixed electrode 11, in which a guide pin 27 having a guide hole 26 in the A position is attached to the fixed electrode 11.
It sticks out from the top. Guide bin 27 is part 7 lunge 2
8 is applied with the elasticity of a coil spring 29, and the tip of the actuating rod 24 is fitted into the guide hole 26. The protruding guide pin 27 relatively passes through the hole 9 of the steel plate component. It has a positioning function. Note that the guide bin 27Fi is suitable to be made of hard synthetic resin, ceramic, or other non-magnetic material. The engagement structure formed at the tip of the actuating rod 24 is explained in Figs. 6 to 8. Then, this structure part has the code 3
3, indicated in its entirety by 0, is the actuating rod 2.
A taper hole 61 with a larger diameter on the opening side is formed at the end of the actuating rod 24, into which the bolt 1 (shown by the two-dot chain line) is fitted. The bolt 1, which has moved forward and is waiting, is engaged as shown in Fig. 5.
Then, the actuating rod 24 is moved back and introduced into the hole 9 and the guide hole 23.

In the case shown in FIGS. 4 and 5, each actuating rod 24 is made of a hollow pipe, and a slit 32 in the axial direction is cut in order to elastically engage the bolt 1. The bolt 1 is engaged by the advancement of the rod 24. In the case shown in Figs. Spring 34f: The spring 34f is attached to the end of the actuating rod 24, and when the bolt 1 relatively enters the accommodation hole 33, it is elastically held by the plate spring 34. Matching hole 35k
In EJ1, the bolt 1 is engaged with a considerable gap t.It is as if the bolt 1 has been dropped into the engagement hole 35 with a gap. Chuck 3 that holds the bolt head 2 at the tip
7 is provided, and the bolt head 'k>'' is provided from the chuck 37.
74 may be released and entered into the engagement hole 35, or the bolt head may be held by the chuck 67 and the supply arm 3b + lowered. The steel plate part 2 is placed on the part, and the actuating rod penetrates the center between the fixed electrodes and protrudes upward.It corresponds to the fixed electrode 38. il! I-electrodes are not shown in the drawings.The above-mentioned embodiment is a case in which the actuating rod advances and retreats in the vertical direction, but in the present invention, the actuating rods are tilted or arranged horizontally so that the actuating rods move forward and backward. It is possible to introduce parts in the direction ◎ (f) Effects According to the present invention, there is no need to manually insert bolts etc. using the actuating metal as described above, and the danger is also avoided. The working efficiency is also improved.Since the actuating rod is inserted in advance into the aromatic hole of the fixed electrode, the relative position of the actuating rod and the guide hole or the hole in the steel plate component, that is, the center alignment, can be set reliably. Therefore, when a bolt etc. is introduced into both holes,
Retraction is performed with high precision.Furthermore, since the bolt, etc. is engaged with the tip of the first actuating rod and moved by pulling the bolt, etc., the tip of the bolt, etc. does not run out, and the hole is closed. Enables smooth retraction without interference with surrounding areas.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIGS. 1 and 2 are longitudinal sectional side views, FIGS. 3 to 7 are partial drawings of the actuating rod, FIG. 6 is a longitudinal sectional side view, and FIG. 4 is a longitudinal sectional side view. The figure is an external side view, Figure 5 is a cross-sectional view of Figure 4 (Il-reflection), Figure 6 is a vertical side view, Figure 7 is a plan view, and Figure 8 is a vertical cross-section showing an example of application to a fixed electrode. A side view, FIG. 9 is an overall view of the device to which the present invention is applied, FIG. 10 is a vertical side view of the supply rod, FIG.
Figure 2 is a longitudinal side view. 5... Steel plate parts, 9.10... Holes, 11... Fixed electrodes, 23°26... Guide holes, 1.5... Projection bolts, etc. 24...f7: Kinrod, 5
0...Engagement structure.

Claims (1)

[Claims] In a device that inserts a projection bolt, etc. into a hole in a steel plate component or a guide hole in a fixed electrode, and welds the bolt, etc. to the steel plate component on the fixed electrode, an actuating rod is inserted into the guide hole in a movable state, and the An engaging structure is provided at the tip, and the bolt, etc. engaged by this is drawn into the hole of the steel plate component or the guide hole as the actuating rod retreats. Electrode for spot welding such as projection bolts.