JP2587387Y2 - Parts positioning device for welding machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component positioning device for an electric resistance welding machine.

[0002]

2. Description of the Related Art A conventional component positioning apparatus will be described below.

In a conventional component positioning device, a positioning pin having a head projecting from the upper surface thereof is slidably provided in a fixed electrode of an electric resistance welding machine, and a workpiece and a component are positioned on the positioning pin. Thereafter, the movable electrode is lowered onto the component under a predetermined load, and the component is welded to the workpiece. At this time, the positioning pin is slidably held with respect to the fixed electrode in order to release sinking of the component due to the lowering of the movable electrode.

FIG. 6 shows an example of a component positioning device for a welding machine. A stepped through hole 1a is formed in the center of the fixed electrode 1 in the axial direction, and a positioning pin 2 is inserted into the through hole 1a. A tapered cylindrical portion 1 b is formed below the fixed electrode 1, and the cylindrical portion 1 b is fitted in the tapered hole 3 a of the holder 3.

The projection 2a above the positioning pin 2 is formed to have a small diameter, and a tapered portion 2b is formed below the projection 2a. The tapered portion 2b accurately positions the nut n fitted to the small-diameter projection 2a. can do.

A compression spring 4 is interposed between a flange 2c provided at the base of the positioning pin 2 and the bottom surface of the tapered hole 3a of the holder 3. The elasticity of the compression spring 4 allows positioning. The pin 2 is urged upward, and the flange 2c is engaged with the step of the through hole 1a of the fixed electrode 1 to prevent the fixed electrode 1 from being pulled out.

In this state, the upper end of the body of the positioning pin 2 protrudes from the upper surface of the fixed electrode 1, into which a positioning hole of the work w is inserted, and then the screw of the nut n supplied by a component supply device (not shown). The hole is inserted into the head of the positioning pin 2 and positioned. Thereafter, the nut n is pressurized by the movable electrode 5 that has descended, and is welded to the work w. At this time, the positioning pin 2 moves downward due to the load applied to the nut n, and when the load is removed, the positioning pin 2 returns due to the elasticity of the compression spring 4.

[0008]

However, in the above-mentioned conventional configuration, since the positioning pin 2 is floated by the compression spring 4, welding debris such as spatter enters the sliding surface between the fixed electrode 1 and the positioning pin 2. And the positioning pin 2 malfunctions.

Further, since the positioning pin 2 is biased by the compression spring 4, there is a variation in the positioning. If the position is not fixed, the machine is stopped, the operation becomes inefficient due to rework, and the parts supply device is not connected. There is a problem that a minute gap with the positioning pin 2 needs to be managed.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an accurate and accurate component positioning device which prevents a fixed electrode and a positioning pin from sticking to each other due to adhesion of welding chips. And

[0011]

In order to achieve this object, a part positioning device for a welding machine according to the present invention is provided with a positioning pin movable in an axial direction in a fixed electrode, and a shaft connected to the positioning pin by an actuator. To the shaft driven in the direction and the magnet of the spindle of the component feeder
Therefore, it was chucked and supplied on the positioning pin.
The gap between the spindle and the tip of the positioning pin
And a magnetic coil for magnetizing a positioning pin via the shaft when a predetermined size is reached .

[0012]

With this configuration, the positioning pin attached to the tip of the shaft is accurately regulated by the fixed electrode, and the positioning pin is magnetized by the magnetic coil to suck the component, so that there is no variation in the positioning of the component. This is easy and accurate, and a small gap between the component supply device and the positioning pin is maintained, resulting in high efficiency. In addition, welding spatter and the like do not adhere to the gap between the positioning pin and the fixed electrode, and there is no malfunction of the machine.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an electric resistance welding apparatus 10, which comprises a welding machine main body 11 and a component supply device 15. In the figure, a positioning device 30 is mounted on the bed 12 at the front of the welding machine body 11, and a fixed electrode 31 is mounted at the upper end of the positioning device 30. A pressurizing device 13 is provided on the head of the welding machine body 11, and a movable electrode 14 is attached to a lower end of the pressurizing device 13. Welding machine body 1
A component supply device 15 is attached to one side surface via a universal bracket 16.

As shown in FIG. 2, the lower part of the fixed electrode 31 at the upper end of the positioning device 30 is screwed into the screw hole of the upper holder 33, and the lower screw part of the upper holder 33 is screwed into the screw hole of the lower holder 34. It is screwed. A cooling water case 45 is attached to the outer periphery of the upper holder 33, and upper and lower portions of the cooling water case 45 are sealed by O- rings 46, respectively. Further lower holder 34
A cylinder bracket 35 is attached to a lower portion of the cylinder 35, and a cylinder 36 as an actuator is held by the cylinder bracket 35.

A magnetic coil 39 is mounted in the cylinder bracket 35, and a cylinder shaft 37, which is a magnetic shaft, penetrates the center of the magnetic coil 39. The upper part of the cylinder shaft 37 is the lower holder 34
Is held slidably in the vertical direction via a bush 38, and the lower portion is connected to the cylinder 36. Further, a positioning pin 40 is inserted into a hole formed at the center of the fixed electrode 31. The positioning pin 40 is attached to the cylinder shaft 37 by the adapter 32 and is held together with the cylinder shaft 37 so as to be vertically movable.

The positioning pin 40 is a magnetic material whose surface is electrically insulated and coated with ceramics or the like, and the head 41 is used for positioning the work 21 and the nut 22 shown in FIG.
(Parts) positioning. And positioning pin 40
Of the fixed electrode 31 is movably held in a hole formed at the center of the fixed electrode 31, and a flange portion 4 formed at the lower end thereof
3 prevents it from slipping upward.

The movable electrode 14 is supported by the pressurizing device 13 so as to be able to move up and down. The distal end of the movable electrode 14 is formed to have a small diameter in accordance with the outer shape of the nut 22, and a positioning pin is provided at the center of the distal end. The recessed hole 14a for the escape of the hole 40 is formed.

FIGS. 4 and 5 show the main part of the component supply device 15. FIG. The component supply device 15 includes a catcher section 17 for catching the nut 22 conveyed by the chute, and a supply section 18 for sending the nut 22 to the fixed electrode 31. The supply section 18 is a pin at the tip of a spindle 19 having a magnet. 19a, the spindle 19 is a nut 22
Is transmitted in the direction of the positioning pin 40, the pin 19a
The gap c between the tip of the positioning pin 40 and the tip of the positioning pin 40 is 0, 1 to 1.
It is adjusted to 0 and 5 mm.

The operation of the component positioning device configured as described above will be described.

When the cylinder 36 is driven, the cylinder shaft 37 moves upward, and the head 41 of the positioning pin 40 at the upper end thereof protrudes from the surface of the fixed electrode 31.
When the workpiece 21 is placed on the fixed electrode 31 and positioned at this position, the spindle 1 of the component supply device 15 is next moved.
The nut 22 is chucked by the magnet 9 and sent out onto the positioning pin 40. When the gap between the pin 19a and the positioning pin 40 the tip of the spindle 19 reaches a predetermined size, a magnetic Tsu preparative itself off the spindle 19 is stopped. Positioning pin 4 through the cylinder shaft 37 in which a by <br/> the excitation of the magnetic coil 39 at the same time
0 is magnetized, the nut 22 is sucked from the spindle 19 to the positioning pin 40, and is set at the tip of the positioning pin 40.

Next, the movable electrode 14 is lowered by the pressurizing device 13, and the nut 22 is pressurized and energized to be welded to the work 21. This welding is performed instantaneously, and when the movable electrode 14 rises, the excitation of the magnetic coil 39 is released, and the positioning pin 40 descends together with the cylinder shaft 37 to move the work 2.
1 is taken out.

As described above, the positioning pin 40 is fixed to the cylinder shaft 37 whose position is accurately regulated by the lower holder 34 via the bush 38, and the positioning pin 40 magnetized by the magnetic coil 39 is connected to the nut 22. Therefore, the positioning pin 40 can always and easily determine the position of the nut 22. Therefore, the tip of the pin 19a of the spindle 19 and the positioning pin 4
It is not necessary to manage a minute gap with the leading end, thereby improving work efficiency.

Further, since no spring is used for holding the positioning pin 40, there is no need to provide a gap between the positioning electrode 40 and the fixed electrode 31, no welding residue enters between the two, and the positioning pin 40 is not operated properly. Also do not cause.
Further, since the positioning pin 40 can be freely moved by the cylinder 36, the work 21 can be easily taken out, and the work can be automated.

[0025]

As described above, the component positioning device for a welding machine according to the present invention includes a positioning pin movable in an axial direction in a fixed electrode, a shaft connected to the positioning pin and driven in an axial direction by an actuator. Of parts supply equipment
Chucked by the spindle magnet
The parts supplied on the positioning pins are
When the gap with the tip of the positioning pin reaches the specified size
By providing a magnetic coil to magnetize the positioning pin through the shaft, facilitating the positioning pin attached to the distal end of the shaft is magnetized in a magnetic coil attracts the component, positioned without variations in the positioning of the components And a small gap with the component supply device is maintained, thereby improving work efficiency. Further, since the positioning pin is precisely held by the fixed electrode, welding spatter or the like does not adhere to a gap between the two, and there is no malfunction of the machine.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electric resistance welding apparatus including a component positioning device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the component positioning device.

FIG. 3 is a perspective view of the nut.

FIG. 4 is a partial perspective view of the component supply device.

FIG. 5 is an enlarged view of the main part.

FIG. 6 is a sectional view of a main part of a conventional component positioning device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electric resistance welding apparatus 11 Welding machine main body 14 Movable electrode 15 Component supply device 19 Spindle 21 Work 22 Nut (part) 30 Component positioning device 31 Fixed electrode 33 Upper holder 34 Lower holder 37 Cylinder shaft (shaft) 38 Bush 39 Magnetic coil 40 Positioning pin

Claims (1)

(57) [Scope of request for utility model registration] An axially movable positioning pin in a fixed electrode, a shaft connected to the positioning pin and driven in an axial direction by an actuator, and a component supply device.
Chucked by the spindle magnet
The parts supplied on the positioning pins are
When the gap with the tip of the positioning pin reaches the specified size
And a magnetic coil for magnetizing a positioning pin via the shaft.