JPH0646631Y2 - Positioning device for small parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a positioning device for fixing and holding parts during welding, and particularly to a part suitable for holding parts other than the welded part. The present invention relates to a positioning device for a small component having a hole.

(Prior Art) Various small parts are attached to a vehicle body by welding. In the small part W shown in FIG. 3, a strip-shaped steel plate is formed by bending, a hole 1 is formed at one end, and a weld nut 2 is welded corresponding to the position of the hole 1. In addition, a welding portion 3 is formed at the other end of the small component W, and the small component W is spot-welded to, for example, the floor of the vehicle body or a member. The weld nut 2 is a bolt screwing nut for mounting other parts which are automobile parts.

When welding such a small part W to a vehicle body or the like, as shown in FIG. 4, a positioning jig 6 in which a permanent magnet 4 is embedded and a recess 5 corresponding to the shape of the small part W is formed. Was used to ensure the accuracy of the welding position.
That is, one end of the small component W is set in the recess 5 of the positioning jig 6, and the jig 6 is moved to the welding position of the vehicle body by a clamp device or the like (not shown). Was spot welded.

A positioning device using an electromagnetic magnet instead of the permanent magnet 4 is also known.

(Problems to be solved by the invention) However, in the small part W as shown in FIG.
Since the hole 1 is formed in the portion held by the positioning jig 6, there is a problem that the suction force is weak. It is also attempted to form a projection corresponding to the hole 1 of the small component W on the permanent magnet 4. However, its processing was difficult and not practical. In addition, when the permanent magnet 4 is used, there is also a problem that the magnetic force of the permanent magnet 4 is reduced due to the magnetic field lines due to the current of spot welding.

On the other hand, when an electromagnetic magnet is used, the magnetic force is weaker than that of the permanent magnet 4, and therefore line troubles such as dropping of the small parts W or deterioration of welding accuracy may occur frequently.

Moreover, in a positioning jig using a permanent magnet or an electromagnetic magnet, in order to automate the welding process, it is necessary to separately provide a sensor for detecting whether or not small parts are set in the positioning jig. , Was one of the factors that provoke equipment complexity and cost increase.

The present invention has been made in view of such problems of the conventional art, and an object thereof is to provide a positioning device having an excellent suction force for small parts.

(Means for Solving the Problems) The present invention for achieving the above object is to hold a small component, which has a hole for attaching another component at one end and a welded portion at the other end, when welding the small component. A positioning device, wherein a holding part corresponding to the shape of one end of the small article is formed at the tip of the holding head body, and a through hole communicating with the holding part and connected to a vacuum means is formed in the holding head body. And, further, in the inside of the through hole of the holding head main body, a closing member having a protruding portion that closes the hole of the small component is provided so as to be movable back and forth with respect to the small component,
An elastic body for pressing the closing member in the direction of the small component is provided in the through hole of the holding head main body, and the small component is attached to the holding portion midway of the path from the vacuum means to the through hole. A positioning device for small parts, characterized in that a vacuum switch is provided which operates when the small parts are turned on.

(Operation) In the present invention configured as described above, the small parts are set in the holding portion of the holding head main body while the vacuum means is operated while the holding head main body is separated from the vehicle body panel. At this time, the small component is sucked and held by the holding portion. The holding in this holding portion is detected by the vacuum switch.

Next, the holding head main body is brought close to the vehicle body panel, and after the welded portion of the small component comes into contact with the welded portion of the vehicle body panel, the welding gun is operated to spot weld the welded portion.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is a front view showing a holding head body of the same embodiment.

As shown in FIG. 1, the holding head body 10 of this embodiment is
It is attached to the tip arm 12 of the clamp device 11,
The tip arm 12 rotates about a shaft 13. Further, the tip arm 12 and the drive arm 14 are rotatably connected about a shaft 15, and a drive means (not shown) such as a hydraulic cylinder is connected to the other end of the drive arm 14 so that the drive arm 14 can be rotated. Is moved downward in the figure, the tip arm 12 moves to a position separated from the panel P of the vehicle body. On the other hand, when the drive arm 14 moves upward in the figure, the tip arm 12 is moved relative to the vehicle body panel P. Move to a close position. This drive means is controlled by the control means of a welding device (not shown).

The holding head body 10 of the positioning device has a small part W at the tip.
A holding member 16 which is a recess corresponding to the shape of the holding member 16 is formed and a cylindrical member 18 having a through hole 17a and an opening of the cylindrical member 18 on the opposite side of the holding member 16 are hermetically closed by an O-ring 19. It is configured by screwing with a lid member 20 that operates. When the small parts W are set in the holding portion 16, as shown in FIG.
Is formed. The lid member 20 includes the tubular member.
A through hole 17b communicating with the through hole 17a of 18 is provided, and a conduit 22 connected to a vacuum device 21 (vacuum means) is connected to one end of the through hole 17b. Further, in the through hole 17 of the tubular member 18, a member having a large diameter hole 24 near the holding portion 16 into which a closing member 23 described later is fitted and a small hole 25 formed around the same.
26 is stuck. As shown in FIG. 2, in this embodiment, four small holes 25 are formed.

The closing member 23 has a projection 27 corresponding to the shape of the hole 1 of the small component W at the tip thereof and is held so as to be movable back and forth with respect to the member 26. An elastic body 28 is interposed between the closing member 23 and the lid member 20, and the closing member 23 is spring-biased in the left side of the drawing, that is, in the direction in which the projection 27 presses the hole 1 of the small component. Has been done.

The vacuum device 21 includes a general vacuum pump and the like,
A vacuum switch 29 is provided in the middle of the conduit 22. The vacuum switch 29 is configured to operate depending on the degree of vacuum in the conduit 22, and therefore the holding head body 10
In the state where the small part W is set in the holding part 16 of the above, since the air in the small space S formed between the small part W and the holding part 16 is sucked, the degree of vacuum in the conduit 22 is It gradually rises, and it becomes possible to detect whether or not the small component W is set in the positioning device of this embodiment by the vacuum switch 29.

In the present embodiment, the tubular member 18 and the member 26 are formed as separate members, but they may be integrally formed depending on the material forming them. Further, the present positioning device can be applied not only to the clamp device 11 shown in the present embodiment but also to a clamp device that performs other operations.

Next, the operation of this embodiment will be described.

In the state where the driving means (not shown) is operated downward in FIG. 1 and the tip arm 12 is separated from the vehicle body panel P, the vacuum device 21 is operated and the small parts are attached to the holding portion 16 of the holding head body 10. Set W. At this time, by sucking the air in the small space S from the small hole 25 formed in the member 26, the small component W can be set in the positioning device.
If the small parts W are not set in this state, the degree of vacuum in the conduit 22 does not rise and the vacuum switch
Since 29 does not operate, small parts W for the body panel P
It is possible to prevent forgetting to attach.

In this state, the vehicle body panel P is set at a predetermined position of the welding device.

When the setting of the small parts W and the vehicle body panel P is completed, the drive means is operated to move the drive arm 14 upward in the drawing, and bring the holding head body 10 close to the vehicle body panel P. Then, after the welded portion 3 of the small part W comes into contact with the welded portion of the vehicle body panel P, the welding gun 30 operates to spot-weld this welded portion.

As described above, according to this embodiment, the small parts are not attracted by the magnetic force but are attracted by the air pressure, so that the magnetic force lines emitted from the welding device are not affected.

Further, although the closing member closes the hole of the small component, the projection of the closing member is fitted into the hole, so that the positioning accuracy of the small component is improved.

Furthermore, by connecting a vacuum switch or the like using a vacuum device that is a source of suction force, it can be shared for the presence confirmation of small parts.

(Effect of the Invention) As described above, according to the present invention, it is possible to accurately position a small component having a hole without being affected by the magnetic field lines of the welding device, and the suction force is extremely high. It will be excellent. Furthermore, it becomes possible to prevent forgetting to attach small parts.

[Brief description of drawings]

FIG. 1 is a sectional view showing an essential part of an embodiment of the present invention, FIG. 2 is a front view showing a holding head body of the same embodiment, FIG. 3 is a perspective view showing small parts, and FIG. It is a perspective view showing a positioning jig. 1 ... Hole, 3 ... Welded portion, 10 ... Holding head main body, 16 ... Holding portion, 17a, 17b ... Through hole, 21 ... Vacuum means, 23 ... Closure member, 27 ... Projection portion, 28: Elastic body, W: Small parts.

Claims (1)

[Scope of utility model registration request] 1. A positioning device for fixing and holding a small component having a welded portion at the other end and a hole for attaching another component at one end, wherein the small component is provided at a tip of a holding head body. A holding part corresponding to the shape of one end of the holding head body is formed, and a through hole communicating with the holding part and connected to a vacuum means is formed in the holding head body, and further, in the through hole of the holding head body, A closing member having a protrusion that closes the hole of the small component is provided so as to be movable back and forth with respect to the small component, and the closing member is pressed into the through hole of the holding head main body in the direction of the small component. An elastic body is provided, and a vacuum switch that operates when the small component is attached to the holding portion is provided in the middle of the path from the vacuum means to the through hole. -Decided Me apparatus.