JPH05154722A - Self-clinching nut fitting device - Google Patents

Abstract

PURPOSE:To surely fit a nut to a work by preventing the displacement of the nut. CONSTITUTION:Magnetic poles different from each other are formed on the face of a punch head 3 pressing a self-clinching nut 1 to a work on the side to be brought into contact with the self-clinching nut 1. A punch core 3a formed with a gap so that the magnetic flux density distribution on this face is made symmetrical with each other and a punch cap 3b made of a nonmagnetic material, covering at least the face of the punch core 3a on the side to be brought into contact with the self-clinching nut 1, and formed with the sliding face where the self-clinching nut 1 can be slid on its surface are provided.

Description

Detailed Description of the Invention

[0001]

The present invention relates to self-clinching
The present invention relates to a self-clinching nut mounting device for mounting a self-clinching nut on a work by inserting the nut into a pre-formed hole formed in the work and then pressing the nut against the work.

[0002]

2. Description of the Related Art Self-clinching nuts (self)
-ClinchingNut) is generally an American standard M
It is standardized to IL-N-45938, and as shown in FIG. 27, it has a nut portion that constitutes a so-called general nut and an inverse taper portion whose diameter decreases as it approaches this nut portion. ing.

Such a self-clinching nut (hereinafter, simply referred to as a nut) 1 has a strength that directly affects the work 2 such as when the work 2 is made of aluminum or a thin steel plate.
It is used when screw processing is not possible. That is, as shown in FIG. 27A, first, the plate-shaped work 2
The reverse taper portion of the nut 1 is inserted into the prepared hole 2a, and then, as shown in FIG. When the nut 1 is pressed, the metal forming the work 2 plastically flows between the outer peripheral surface of the reverse taper portion and the end surface of the nut portion, and the nut 1 is fixed to the work 2. In the screw fastening work, as shown in FIG. 27C, the connection work 2b is attached to the surface opposite to the surface on which the nut 1 is attached, and the screw 2c is fastened from one direction. During this time, since the nut 1 is fixed to the work 2, it is not necessary to hold the nut 1.

As described above, since the nut 1 can be easily used as a fastening structure for a thin plate material or the like,
Nowadays, when weight reduction of products is required, it is widely used as an optimum nut.

Conventionally, as an apparatus for attaching the nut 1 to the work 2, for example, as shown in FIGS. 28 and 29, the pilot hole 2a of the work 2 is manually attached to the anvil head 4.
After being inserted into the upper location pin 5, the nut 1 which is oriented in a certain direction by the nut aligning device 6 is automatically supplied to the location pin 5 by the nut transport device 7,
Then, the pressurizing device 8 is operated by a foot switch or the like (not shown) to lower the punch head 3, thereby pressurizing the nut 1 with the anvil head 4, and the work 2
There is one that attaches the nut 1.

Since the reverse taper portion of the nut 1 and the lower hole 2a are fitted with each other with high accuracy, naturally, the lower hole 2a and the location pin 5 are also fitted with high accuracy. Therefore, so that the location pin 5 can be easily inserted into the pilot hole 2a,
The location pin 5 is generally tapered.

[0007]

In the above-mentioned conventional technique, when the nut 1 is supplied to the location pin 5, as shown in FIG.
As shown in (A), the nut 1 is inclined and supplied,
The nut 1 sometimes came off the location pin 5. Further, in order to easily insert the location pin 5 into the prepared hole 2a, as shown in FIG. 29 (B), when the taper portion dimension l is larger than the plate thickness t of the work 2, the nut 1 is press-inserted. When the location pin 5 is sometimes pushed down, the inner peripheral surface of the pilot hole 2 and the straight body portion of the location pin 5 do not come into contact with each other, that is, there is the location pin 5 there.
Since the taper portion comes, the position of the work 2 may be displaced.

This tendency is particularly caused when a nut is attached to a thin work piece by using a device having a large taper portion size in order to maintain the insertability of the location pin 5 into the pilot hole 2a. Was noticeably seen in. As described above, the conventional technique has a problem in that the nut cannot be attached to the work accurately and surely due to the displacement of the nut or the work.

The present invention has been made by paying attention to such a conventional problem, and provides a self-clinching nut mounting apparatus capable of accurately and surely mounting a self-clinching nut on a work. With the goal. In addition, as a related technique, Japanese Patent Laid-Open No. 1-22
Although there is a shaft insertion device described in Japanese Patent No. 34127, this conventional technique cannot be applied to the insertion of a component having a shaft fitting portion smaller than the shaft body, such as a self-clinching nut.

[0010]

A self-clinching nut mounting device for achieving the above-mentioned object has a surface on a side where a punch head for pressing a self-clinching nut against a work comes into contact with the self-clinching nut. A magnetic core having different magnetic poles and a magnetic flux density distribution symmetrical to each other on the surface, and a contact between the self-clinching nut made of a non-magnetic material and the punch core. And a punch cap having a sliding surface on which the self-clinching nut is slidable. The punch cap is formed on the surface of the punch cap.

In another self-clinching nut mounting device for achieving the above object, a punch head for pressing a self-clinching nut against a work has a punching direction substantially perpendicular to the pressing direction. An anvil head for holding the work in a direction opposite to the pressing direction of the self-clinching nut is formed so as to be insertable into the pilot hole of the work, and a tip portion thereof is provided. Is in contact with a location pin formed so as to be inserted into a screw hole of the self-clinching nut and a surface of the workpiece opposite to the side where the self-clinching nut is inserted, and the location pin is attached to the workpiece. The location pin and the anvil that restrains it so that it can move in the pressing direction of The anvil that is held is movably supported in a direction substantially perpendicular to the pressing direction of the work, and when the location pin is inserted into the pilot hole of the work, the anvil is immovably restrained. An anvil lock mechanism and an actuator that applies a constant force to the location pin in the pressing direction of the work are provided.

Here, a sensor for detecting the position of the location pin in the work pressing direction of the location pin with respect to the anvil and the self-clinching nut mounting device for the punch head are supplied to the self-clinching nut mounting device. It is desirable to have a sensor for detecting whether or not it is. Further, it is desirable that the self-clinching nut mounting device is provided with a work restraint mechanism that restrains the work immovably. Further, the self-clinching nut mounting device stores a nut supply means for supplying the self-clinching nut to the punch head, and a storage means for storing the position of the prepared hole on the work. It is preferable to provide a work supply unit that conveys the work based on the position of the prepared hole so that the prepared hole comes to a target position.

The nut supply means is a tube having an inner size corresponding to the outer size of the self-clinching nut, and an air blower for supplying air to the tube in an amount of air that can be conveyed by the self-clinching nut. And may have.

Further, when the target work is relatively large, the work supply means is provided with a work table on which the work moves while being in contact therewith, and the work table is provided with a convex portion of the work. It is preferable that a deformation member that is deformed by at least the height of the convex portion is provided in a direction in which the load of the work is applied when pushed.

[0015]

In the punch core of the punch head, a magnetic field having a symmetrical magnetic flux density is formed across the gap. When a line-symmetrical nut is supplied here, the magnetic field acts so that the nut cuts the magnetic field lines evenly on the left and right, so the nut slides on the surface of the punch cap made of a non-magnetic material and moves linearly with respect to the gap. It is centered on the target position, that is, the center of the punch head where the gap is formed.

Therefore, even if the nut is not supplied to the center of the punch head, the nut can be supplied to the center of the punch head almost accurately by the action of the magnet. Therefore, high-speed supply of the nut is facilitated and the nut is easily supplied. It is possible to prevent poor nut mounting due to misalignment.

The operation when the work is supplied to the position where the pilot hole of the work deviates from the central axis of the punch head and the anvil head will be described. In the following description, the punch head is arranged above the work and the anvil head is arranged below the work in order to make the contents of the description easy to understand.

When the center of the pilot hole of the work and the center of the location pin are deviated, the location pin moves horizontally along with the anvil during the process of the ascent of the anvil head, and moves horizontally along with the anvil. Fit in. Due to this horizontal movement, the location pin is displaced in the horizontal position from the nut supplied on the central axis of the punch head.

When the location pin fits into the pilot hole, the anvil locking mechanism is activated to immobilize the anvil. By this operation, the location pin can move in the vertical direction but cannot move in the horizontal direction.
Then, the punch head starts descending. The nut attached to the punch head is guided along the funnel-shaped recess in the thread of the nut itself to the tip of the location pin, which is offset from the center axis, and slides horizontally on the punch core surface. Move to and fit into the tip of the location pin so that the central axis of the pilot hole and the central axis of the nut are aligned.

The punch head continues to descend after that, and the nut is attached to the prepared hole of the work. Here, for example, if the nut is not firmly attached to the work due to a defective nut, etc., the location pin receives a certain amount of force from the actuator in the vertical direction. It loses this force and completely comes off the work. As the constant force applied to the location pin, it is generally preferable to use the value of the push-pull load used in the nut attachment state inspection performed after the nut attachment.

As described above, even when the work is supplied to the position where the central axis of the nut and the central axis of the pilot hole are deviated, the central axis of the nut matches the central axis of the pilot hole. Since it is guided to the position, the nut can be attached to the work accurately. In addition, a nut that is not properly attached can be detected during the nut attaching step, and the step of inspecting the nut attached state can be substantially omitted.

In the case where a sensor for detecting the vertical position of the location pin with respect to the anvil is provided, for example, when a workpiece without a pilot hole is supplied, when a workpiece to which a nut is already attached is supplied, etc. In this case, the position of the location pin in the vertical direction is different from that in the normal case, and therefore these states can be detected.
Also, in the case where the work restraint mechanism is provided, if the movement of the work is restrained by the work restraint mechanism when pressing the nut, it is not necessary to maintain the position of the work by the location pin, so The taper part that improves the insertability of the location pin into the hole can be determined regardless of the plate thickness of the work, the workability of the work into the pilot hole can be improved, and the position shift of the work can be prevented. ..

If the size of the taper portion of the location pin can be increased to some extent regardless of the plate thickness of the work, the prepared hole of the work is relatively displaced from the central axes of the punch head and the anvil head. Also, since the followability of the location pin to the pilot hole is enhanced, the location pin can be reliably inserted into the pilot hole, and more reliable nut mounting can be performed.

Further, in the case where the work supply means and the nut supply means are provided, the steps from the step of setting the work and the nut between the punch head and the anvil head to the step of finally attaching the nut are automated. It is possible to reduce manpower.

[0025]

EXAMPLES Various examples of the nut mounting device according to the present invention will be described below. A first embodiment of the nut mounting device will be described with reference to FIGS. 1 to 19. As shown in FIG. 3 and FIG. 4, the nut mounting device of the present embodiment includes a punch head 3 and an anvil head 4 that directly apply pressure to the nut 1, and a linear guide 10a that moves these with high accuracy in the vertical direction. , Pressurizing devices 8 and 9 (in this embodiment, two sets for M3 size and M4 size are mounted) for performing a pressurizing operation, and nut alignment for orienting the nuts 1, 1, ... In a fixed direction. Device 6, a nut transport device 11 that transports the nut 1 to a predetermined position, and the transported nut 1
A nut supply device 12 for supplying the punch head 3 to the punch head 3, a control device 14 for controlling these operations, and a storage device 13 for storing a target position for supplying the work 2 and a position of the prepared hole 2a on the work 2. It is configured to have a frame 10 on which these are mounted and which has a substantially C-shaped cross section, a work loading device 16 for loading the work 2, and a work supply device 15 for transporting the work 2 from the loading device 16 to a target position. ing.

FIG. 1 is a vertical sectional view showing an embodiment of a nut mounting head according to the present invention. The nut mounting head includes the above-mentioned punch head 3, anvil head 4, and
Comprised of pressure devices 8 and 9 and a linear guide 10a,
The punch head 3 and the anvil head 4 are arranged so that their central axes coincide with each other.
The structure is such that it can move in the axial direction Z with an optimum pressure.

As shown in FIGS. 1 and 2, the punch head 3 has a collar 3d provided at the lower end of the pressure device 8.
A punch core 3a formed of a magnetic material and provided at an end of the collar 3d, and a cap 3 of a non-magnetic material covering the punch core 3a.
b, a bearing 3f provided around the collar 3d,
It is composed of a work retainer 3e which moves along the sliding surface of the bearing 3f in the axial direction Z to the work 1 surface, and a cylinder 3g which is provided on the collar 3d and moves the work retainer 3e.

As shown in FIG. 2, the punch core 3a made of a magnetic material is provided with a magnet 3c therein, which is perpendicular to the nut feeding direction y and at the center axis of the magnet 3c and the punch core 3a. A gap G is formed above. In the punch core 3a, the magnet 3c forms an N pole on one side and an S pole on the other side with the gap G as a boundary.
As described above, the cap 3b covering the punch core 3a is made of a non-magnetic material, for example, SUS303 material, and its outer surface is finished smoothly.

The punch head 3 having such a structure
When a line-symmetrical steel nut 1 is supplied to the position, a centripetal force C that acts to apply a uniform magnetic force F around the gap G acts on the nut 1 and the cap 3 slides.
b a position on the surface where the gap G is provided,
That is, it is centered on the central axis of the punch head 3. Therefore, even when the nut feeding speed is increased, the nut deviation amount with respect to the central axis of the punch head 3 is corrected by the action of the magnet 3c, and the nut 1 can be fed onto the central axis of the punch head 3. Needless to say, such a suction centripetal mechanism can be widely applied to not only nuts but also line-symmetrical magnetic parts.

The anvil head 4 has a hollow main body 4g, a floating shaft 4b arranged therein, an actuator 4d for moving the floating shaft 4b up and down, and a floating shaft 4b.
Location pin 5 provided at the upper end of the floating shaft 4b and the location pin 5 at the upper end of the floating shaft 4b.
And an anvil 4a slidably fitted to the head main body 4g and a housing 4c fitted to the head main body 4g so as to be vertically movable.

The floating shaft 4b is made of spring steel or the like, and its central portion is elongated. A clearance i is provided between the anvil 4a and the inner wall of the head body 4g, and the anvil 4a slidably fitted to the location pin 5 and the floating shaft 4b has a clearance i equal to H. You can move in any direction. The location pin 5 and the anvil 4a are normally located on the central axis of the anvil head 4, and when an external force in the H direction is applied, the clearance i
When the position pin 5 moves by a minute and the external force disappears, the location pin 5 returns to the central axis of the anvil head 4 again by the elasticity.

Here, the floating shaft 4b is
For example, the diameter of the thin part in the center is φ2 mm and the length is 200
Floating shaft 4b when formed to about mm
Deforms with a low load of about 0.2 to 0.3 N in the H direction and about 7.8 × 10 ³ N to 2.N in the Z direction.
Can withstand a large load of 0 × 10 ⁴ N.

The actuator 4d can move the location pin 5 up and down via the floating shaft 4b according to an instruction from the control device 14, and can apply a constant force to the location pin 5 for a certain period of time. Sensors 4e and 4f for detecting the vertical position of the internal cylinder are provided in the actuator 4d in order to detect the vertical position of the location pin 5.

The housing 4 is provided on the side of the housing 4c.
Ports a and b for supplying compressed air are provided in two upper and lower chambers formed between c and the head body 4g. The housing 4c can move up and down relatively with respect to the head body 4g according to the amount of compressed air supplied into the upper and lower chambers.

A collar portion is formed around the anvil 4a. This flange portion is located between the upper end surface of the head body 4g and the upper inner surface of the housing 4c, and when the housing 4c rises relative to the head body 4g, the anvil 4a can move in the H direction. State,
When the housing 4c descends relatively to the head body 4g and the flange portion of the anvil 4a is sandwiched between the housing 4c and the head body 4g, the anvil 4a is locked so that it cannot move in the H direction. Become.

In the nut aligning device 6, as shown in FIGS. 3 and 5, the nut contact surface has a predetermined angle θ with respect to the installation surface.
And a vibrating mechanism 6b for vibrating the guide 6a which is formed in a spiral shape.

As shown in FIG. 7, the nut transfer device 11 includes a casing 11k having a hollow structure inside, a cutout bar 11f fitted in the casing 11k so as to be horizontally movable in the K direction, and a cutout bar 11f. It has a cylinder 11i for horizontal movement and an air blower (not shown) for supplying air E into the casing 11k.

The casing 11k has a conveying guide 7a for guiding the nut 1 in the nut aligning device 6 into the casing 11k, and air E from the air blow device in the casing 1k.
It communicates with an air tube 11e for guiding the inside of 1k and a nut transport tube 11a for guiding the nut 1 from the casing 11k to the nut supply device 12. The cut-out bar 11f has a pocket 11g in which one nut 1 is inserted,
An air passage hole 11h is formed for guiding the air E passing through the air tube 11e to the nut carrying tube 11a. The cylinder 11i is provided with a sensor 11j for detecting the position of the cutting bar 11f.

As shown in FIG. 6, the internal dimensions of the transfer guide 7a for guiding the nut 1 from the nut aligning device 6 to the nut transfer device 11 are such that the nut 1 moves smoothly in the transfer guide 7a and is of a different type. It is decided to have a clearance that does not flow when a nut is mixed.

As shown in FIG. 8, the nut supply device 12 includes a casing 12f that temporarily holds the nut 1 that has passed through the nut transport tube 11a, and a finger that grips the nut 1 and supplies it to the punch head 3. 12h are provided.

The casing 12f has a casing 12f.
A sensor 12b is provided to detect whether or not a predetermined number of nuts 1 for the pool are contained therein. Finger 1
2h is configured by key-shaped finger rods 12n and rod-shaped finger rods 12m that are pin-coupled at their base ends. A cylinder 12k is provided on the base end side of the key-shaped finger rod 12n for swinging the finger rod 12n around the base end and causing the finger 12h to grip the nut 1. A cylinder 12l for horizontally moving the finger 12h is provided on the base end side of the rod-shaped finger rod 12m. The cylinders 12k and 12l are respectively provided with sensors 12e and 12d for obtaining operation information of the cylinders.

The finger 12h holds the nut 1 by the tip of the key-shaped finger rod 12n and the tip of the rod-shaped finger rod 12m.
When the nut 1 is supplied from 2f to the finger 12h,
The swing range of the key-shaped finger rod 12n is limited so that the nut 1 can be smoothly fitted between the tip of the key-shaped finger rod 12n and the tip of the rod-shaped finger rod 12m. The casing 12f is provided with a tapered stopper 12g that restricts the gripping operation.

In addition to these, the nut supply device 12 has a sensor 12c for detecting whether or not the nut 1 is fitted between the tip of the key-shaped finger rod 12n and the tip of the rod-shaped finger rod 12m. And a sensor 12a for detecting whether or not the nut 1 is supplied to the punch head 3,
A roller 12j is provided forcibly closing the finger 12h that has been opened to supply the nut 1 to the punch head 3. The roller 12j is provided at a position where the finger 12h can be closed at a point where it reaches a position where the open finger 12h does not interfere with the supplied nut 1.

Next, the operation of the nut mounting device will be described. A plurality of works 2, 2, ... In which a prepared hole 2a for mounting the nut 1 is preliminarily formed is loaded on the work loading device 16. Further, a plurality of nuts 1, 1, ... Are put in the nut aligning device 6.

The work feeding device 15 is the work loading device 1.
The work 2 in 6 is gripped, and the work 2 is supplied onto the central axes of the punch head 3 and the anvil head 4 according to an instruction from the control device 14. The instruction from the control device 14 is given based on the stored contents of the storage device 13.

On the other hand, the nut 1 vibrates by the vibrating mechanism 6b of the nut aligning device 6, moves upward along the guide 6a, and reaches the conveyance guide 7a. During this movement process, the nut 1 which is not oriented in the determined direction is shaken off. This is because the nut contact surface of the guide 6a is inclined at a predetermined angle θ with respect to the installation surface, so that the center of gravity g of the nut 1 oriented in a predetermined direction is g as shown in FIG. 5 (A). Although the nut 1 is inside the nut holding step of the guide 6, but the nut 1 that is not oriented in a predetermined direction has a center of gravity g as compared with the nut holding step of the guide 6, as shown in FIG. This is because it will be located outside.

Among the nuts reaching the transport guide 7a, a nut larger than the nut 1 having a predetermined size cannot enter the transport guide 7a and is shaken off. After that, the nut 1 drops in the conveyance guide 7 a along the inner wall of the guide and is supplied to the nut conveyance device 11.
This supply operation is managed by the sensors 7b and 7c. The nut 1 is managed so as to always fit within the conveyance guide 7a up to the position of the sensor 7b, and when the nut 1 is not fit up to the position of the sensor 7c even when the nut aligning device 6 is operating, there is no nut. Is displayed. With this display, the remaining amount of the nut 1 can be easily managed.

Nut 1 supplied from the conveyance guide 7a
However, as shown in FIG. 7 (A), when it enters the pocket 11g of the cutting bar 11f of the nut transport device 11, the cylinder 11i is driven to move the cutting bar 11f in the direction K, and the pocket 11g is As shown in 7 (B), it communicates with the air tube 11e. The nut 1 in the pocket 11g is sent to the nut transport tube 11a by the air E that has passed through the air tube 11e from an air blower (not shown). The operation timing of the cutout bar 11f is managed by a signal from the sensor 11j.

In this embodiment, the nut carrying tube 11a is made of polymer plastic or the like, as shown in FIG.
As shown in (B), the conveyance route is twisted by 180 °. This twist causes the nut 1 to flip 180 °,
Through the nut supply device 12, the nut 1 is supplied in the intended direction to the punch head 3 installed on the upper side.

As described above, the nut 1 corresponds to the punch head 3
In the process up to the step of supplying the nuts 1, the nuts are not supplied by the free fall method, so that the nut aligning device 6 can be installed at a low position where the operator can easily supply the nuts 1, and the workability is improved. ..

The nut 1 is the pocket 1 of the cutting bar 11f.
When discharged from 1g, the cylinder 11i is driven again and the cut-out bar 11f returns to the original position. During this time,
The nut 1 in the nut transport tube 11a is transported by the air E guided into the tube 11a via the air passage hole 11h of the cutout bar 11f.

As shown in FIG. 8A, the nut 1 is supplied from the nut transport tube 11a into the casing 12f of the nut supply device 12. The nut 1 is temporarily stored in the casing 12f. Casing 12f
Whether or not there is a predetermined number of nuts for the pool is managed by the sensor 12b.

The nut 1 in the casing 12f is made of air E
And the tip of the key-shaped finger rod 12n and the rod-shaped finger rod 12 that form the fingers 12h one by one.
sent to the tip of m. At this time, the tip of the key-shaped finger rod 12n and the rod-shaped finger rod 12m.
Since the swing range of the key-shaped finger rod 12n is regulated by the tapered stopper 12g so that a clearance of (nut diameter + α) is maintained between the nut 1 and the finger portion, It fits smoothly within 12h. Whether or not the nut 1 fits between the tip of the key-shaped finger rod 12n of the finger 12h and the tip of the rod-shaped finger rod 12m is controlled by the sensor 12c. It should be noted that the sensor 12c is provided because when the nut 1 is stopped in the middle of the casing 12f and the finger 12h, the finger 12h is moved by the cylinder 12l without confirming that the nut 1 is securely set in the finger 12h. This is to prevent the lock state when moving.

When the nut 1 is set in the finger 12h,
The cylinder 12l is driven, and the finger 12h moves toward the punch head 3. During this movement process, the tapered portion 12i of the key-shaped finger rod 12n is separated from the tapered stopper 12g, and the key-shaped finger rod 1 is removed.
2n restriction is released, nut 1 is finger 12h
Is firmly gripped by.

When the finger 12h moves and the nut 1 reaches the punch head 3, the sensor 12e detects this and the cylinder 12k is driven to open the finger 12h.
The opened finger 12h is returned to its original position by the cylinder 12l. At this time, when the fingers 12h reach a position where they do not interfere with the nut 1, the rollers 12j forcefully
The finger 12h is closed and the cylinder 12k also performs the closing operation. The operation timing of the cylinder 12k is managed by the information from the sensors 12d and 12e.

As described above, the nuts 1 of a predetermined number or more are always pooled in the nut supply device 12, and the gripping operation of the nuts 1 by the fingers 12h is performed while the fingers 12h are moving, so that the nuts 1 can be shortened. It will be possible to supply a large amount in time. Specifically, the conventional nut supply is about 20 to 30 pieces / minute, but 90 pieces / minute or more can be supplied.

The operation of attaching the nut 1 to the work 2 will be described with reference to FIGS. 9 to 11. As described above, the nut 1 gripped by the fingers 12h is stopped on the substantially central axis of the punch head 3 and then the fingers 12h are opened to open the punch head 3 as shown in FIGS. 9 (A) and 9 (B). Adsorb to. The adsorbed nut 1 is shown in FIG.
As shown in FIG. 3, the centripetal force C by the magnet 3c acts to centripe the punch head 3 on the central axis thereof.

As described above, the nut 1 is centered on the center axis of the punch head 3 even if the nut 1 is not accurately supplied on the center axis of the punch head 3, so that the nut 1 is easily and rapidly supplied. be able to.

Next, as shown in FIG. 9 (D), the anvil head 4 rises, and the location pin 5 enters the prepared hole 2a of the workpiece 2 supplied as described above. afterwards,
As shown in FIG. 10 (E), the work clamp 3e is lowered,
The work 2 is clamped by the work presser 3e and the anvil head 4 to fix the work 2.

When the work 2 is fixed, as shown in FIG. 10 (F), the punch core 3a starts to descend, and the threaded portion of the nut 1 is guided to the tip of the location pin 5.
The punch core 3a is further lowered as shown in FIG. 9 (G), and the nut 1 is attached to the prepared hole 2a of the work 2.
At this time, the location pin 5 is lowered together with the nut 1 because the force pushed down by the punch head 3 via the pressure device 8 is better than the force raised by the actuator 4d of the anvil head 4. After the nut is attached, as shown in FIGS. 9H and 10I, the punch core 3a and the work retainer 3e are returned in this order.
After that, the above operation is repeated.

As described above, since the work 2 is fixed by the work holder 3e of the punch head 3 when the nut 1 is mounted, the position deviation from the punch head 3 is eliminated and the nut 1 can be mounted accurately. Become. Further, since the positional deviation of the work 2 is eliminated, the length of the tapered portion of the location pin 5 can be sufficiently secured even for a work having a thin plate thickness.
It is possible to accurately guide the nut 1 to the pilot hole 2a. Actually, the nut size M4 is the plate thickness t1.0mm
Compared with the conventional technology when mounting on the workpiece of No. 1, the length of the taper portion of the location pin 5 is
It is possible to increase the length from about 0.8 mm to 3 mm or more, so that the nut 1 can be mounted accurately. At this time, the size of the pilot hole is φ5.4 mm, and the maximum clearance between the location pin 5 and the pilot hole 2a is 0.
High precision of 04 mm.

Next, as shown in FIG. 12A, the operation when the position of the lower hole 2a of the supplied work 2 is slightly displaced from the central axes of the punch head 3 and the anvil head 4 will be described. This will be described with reference to FIGS.

The feeding operation of the nut 1 to the punch head 3 is as follows.
The same as above. The location pin 5 is, as shown in FIG. 12B, during the process of raising the anvil head 4.
Following the pilot hole 2a, it moves in the H direction together with the anvil 4a and fits into the pilot hole 2a. As described above, this means that the clearance i is provided between the anvil 4a and the inner wall of the head body 4g, and the rotating shaft 4b provided with the location pin 5 has a clearance of about 0.
This is because it is deformed under a low load of about 2 to 0.3N.

When the location pin 5 is fitted in the lower hole 2a, air is supplied from an air blower (not shown) to the lower chamber formed between the housing 4c and the head body 4g. Therefore, the housing 4c descends with respect to the head body 4g, the flange portion of the anvil 4a is sandwiched between the housing 4c and the head body 4g, and the anvil 4a and the location pin 5 cannot move in the H direction. It will be locked.

Next, as shown in FIG. 12C, the work retainer 3e is lowered to fix the work 2 on the anvil 4a. After this, the punch core 3a starts descending and the nut 1
In the vicinity of, the descending speed is reduced by the decelerating means (not shown). The nut 1 is guided to the pointed portion of the location pin 5 deviated from the central axis along a funnel-shaped recess provided in the threaded portion of the nut 1 itself, moves in the H direction on the punch core 3a, and then the nut 1 shown in FIG. ) As shown in FIG.

The punch core 3a continues to descend, and the punch core 3a shown in FIG.
As shown in FIG. 3 (E), the nut 1 is attached to the pilot hole 2a of the workpiece 2.
To install. After attaching the nut 1, first, FIG.
As shown in (F), the punch core 3a returns, and then
As shown in FIG. 13G, the location pin 5 is pulled in. Then, as shown in FIG. 13 (H), after returning the work retainer 3e and the anvil head 4 with the location pin 5 retracted, the location pin 5 is pushed out.

As described above, by pulling out the location pin 5 while the work 2 is fixed by the work retainer 3e, it is possible to operate the work 2 at a high speed without deforming the work 2 having a high fitting precision. Further, even if the position of the prepared hole 2a of the work 2 is slightly deviated from the central axes of the punch head 3 and the anvil head 4, the nut 1 can be surely attached at a correct position by being automatically corrected.

Next, the nut 1 once attached to the workpiece 2
The operation for detecting the improper mounting is described below. Even after the nut 1 is attached to the location pin 5, the actuator 4d moves in the pushing direction.
By applying a steady pressure R for a certain period of time, the nut 1 that is not properly attached can be detected. Here, the value of the steady pressure R is the value of the push-pull gauge used when manually performing the mounting inspection, or the screw 2c on the nut 1.
When screwing in, the force applied to the nut 1 from the electric screwdriver, specifically about 58 to 78 N, is set.

The punch head 3 pushes the location pin 5 through the nut 1 as shown in FIG.
Attach the nut 1 to the work 2. As shown in FIG. 14B, the punch core 3a returns. At this time, nut 1
In FIG. 14, the nut 1 which receives the steady pressure R from the location pin 5 and cannot withstand this force is disengaged from the work 2 as shown in FIG.

As described above, during the nut mounting process,
A poorly mounted nut can be detected, a special inspection process can be omitted, and a working process can be shortened. In addition, by automatizing the detection of defective nuts,
The work man-hour can also be reduced. Even if a defective nut having no reverse taper portion (portion to be inserted into the work) is supplied, it is not possible to firmly attach the nut to the work 2. Therefore, it is needless to say that such a defective nut can be detected. Yes.

Next, the detection operation when the working hole 2a of the workpiece 2 is erroneously machined or the wrong nut is supplied will be described with reference to FIGS. It should be noted that in these drawings, the structure inside the anvil head 1 is drawn in a simplified manner as compared with FIG. 1 in order to facilitate understanding of the operation description.

First, regarding the operation for normal ones,
This will be described with reference to FIG. When the work 2 is supplied and when the work 2 is fixed by the work retainer 3e, FIG.
As shown in (A) and (B), the sensor 4e detects that the location pin 5 is located at the uppermost position. When the nut 1 is pressed by the punch core 3a and when the punch core a is returned, as shown in FIGS. 15C and 15D, the intermediate stroke state and the sensors 4e and 4f are in the non-detection state.

Therefore, when the lowermost position of the location pin 5 is detected, or when the uppermost position of the location pin 5 is detected except when the work 2 is supplied and when the work 2 is fixed, there is some abnormality. It will be The control device 14 determines whether or not there is an abnormality based on the information from these sensors 4e and 4f, and if there is an abnormality, issues an alarm.

The operation when the work 2 having no prepared hole is supplied due to a programming error or a processing error will be described with reference to FIG. When the work 2 having no prepared hole is relatively light, the location pin 5 is
As shown in (A), although the work 2 is lifted, it cannot be lifted completely and the uppermost position of the location pin 5 cannot be detected. Also, if
Even if the location pin 5 is completely raised and the uppermost position is detected, as shown in FIG. 16 (B), when the workpiece 2 is pressed by the work retainer 3e, the location pin 5 is lowered to the lowest position. , Which is detected by the sensor 4f.

When the work 2 is relatively heavy and is pushed down by the work supplied by the location pin 5, it is detected that the location pin 5 is located at the lowest position. Therefore, in such a case, the control device 14 issues an alarm.

Next, the operation when the workpiece 2 having a large pilot hole is supplied to the nut 1 and when the nut 1 having no reverse taper portion is supplied will be described with reference to FIG. When a workpiece 2 with a large pilot hole is supplied, and when a nut 1 without a reverse taper is supplied,
Since the nut 1 is not firmly attached to the prepared hole 2a, even when the punch core 3a returns after pushing the nut 1 into the work 2, the nut 1 is lifted, so that the uppermost position of the location pin 5 is To be detected.

Next, the operation when a nut having a size smaller than the size of the nut to be attached is mixed in the supplied nut 1 will be described with reference to FIG. In the present embodiment, a nut having a size larger than the size of the nut to be attached is shaken off at the stage of moving from the nut aligning device 6 to the conveyance guide 7a, so that the nut having a large size is not supplied to the punch head 3.

For example, M3 in a nut 1 of M4 size
When a nut of the size comes in, punch core 3
When a pushes the M3 size nut into the work 2, M
The location pin 5 is not inserted into the screw hole of the M3 size nut because the pointed portion of the M4 size location pin 5 is thicker than the screw hole of the 3 size nut. Therefore, the lowermost position of the location pin 5 is detected by the sensor 4f. Therefore, even in such a case, the control device 14 issues an alarm.

Next, the operation in the case where the operator erroneously specifies the place where the nut 1 has already been attached and positions the workpiece 2 will be described with reference to FIG. This behavior is
Similar to the case where the work 2 having no prepared hole is supplied, the work 2 with the nut 1 is relatively light, and even when the work 2 is supplied, as shown in FIG.
Is completely raised and the highest position is detected,
As shown in (B), the lowest position of the location pin 5 is detected when the work 2 is pressed by the work press 3e. Further, when the work 2 is relatively heavy, the location pin 5 is pushed down by the supplied work, and the lowermost position of the location pin 5 is detected. Thus, by detecting the position of the location pin 5, various abnormalities can be automatically determined.

As described above, in this embodiment, the nut 1 is attached to the work 2
It is possible to accurately and surely attach it to, and to judge various abnormalities. Further, since the apparatus carries out from loading of the nut 1 and the work 2 to supply, mounting of the nut, and removal of the work to which the nut is mounted, manpower can be largely saved. Although the punch head 3 is provided above the work 2 in this embodiment,
This does not limit the present invention and may be provided below the work 2.

Next, a second embodiment of the nut mounting device will be described with reference to FIGS. The nut mounting device of the present embodiment is a large work, for example,
It is used to attach the nut 1 to a work piece of 914 × 1829 mm, and is different from the first embodiment in that the work loading apparatus 1
The basic configurations of the other parts are the same as those of the first embodiment except for the configurations of 6, the work supply device 15, and the nut transfer device 11. Further, the nut mounting device of the present embodiment is provided with four sets of the punch head 3 and the anvil head 4, and the installation directions of these are alternately changed in the vertical direction.

As shown in FIG. 21, the work stacking device 16 is a supply work stacking unit 16 for stacking the works 2 to be supplied.
a, a work loading portion 16b with a nut for loading the work 2 to which the nut 1 is attached, a work carrier 16i for holding the work 2, an elevating device 16e for elevating the work carrier 16i, and an elevating device together with the work carrier 16i. A linear guide 16d that moves in the 16ex direction is provided.

The supply work stacking portion 16a is provided with a positioning bar 16c for contacting the end surface of the work 2 for positioning the work 2 being loaded.

The work carrier 16i has a plurality of suction pads 16f for sucking the work 2, and a positioning device 16h for positioning the work 2 with respect to the work supply device 15 when the work 2 is supplied to the work supply device 15. is doing. As shown in FIG. 26, the positioning device 16h includes a pin 16g inserted into a positioning hole 2d provided in the work 2 in advance, a cylinder 16k for moving the pin 16g in a constant J direction, and a pin 16g. A rotary shaft 16j for rotating the cylinder 16k around the O axis is provided. The positioning hole 2d is provided in the portion of the clamp allowance that is removed when the work 2 is completed.

As shown in FIG. 20, the work supply device 15 includes a clamp device 15b for moving the work 2 in the y direction while gripping the work 2, and a work 2 on which the work 2 gripped by the clamp device 15b is placed. The table 15a and the base 16f that supports these are provided.

On the work table 15a, a guide rail 15e for moving the clamp device 15b in the y direction.
A table body 15g on which the work 2 is placed and a roller 15d for moving the work table 15a itself in the x direction with respect to the base 16f are provided. As shown in FIG. 23, a slender elastic body 1 having a spherical wear resistant material 15h fixed to the tip thereof is mounted on the table body 15g.
A plurality of 5i are provided.

Here, the elastic force S [N / cm ² ] per unit area of the plurality of elongated elastic bodies 15i is calculated from the largest weight work (for example, steel plate) among the works supplied to the apparatus before the nut 1 is attached. The force per unit area received by the plurality of elongated elastic bodies 15i is P [N / cm ² ], and the nut attached to the work of the minimum weight (for example, aluminum plate) among the works supplied to the apparatus after the nut 1 is installed. The force per unit area received by one to a plurality of elongated elastic bodies 15i is B [N
/ Cm ² ], the value is set to the value defined by the following formula.

P <S <B (Equation 1) The nut carrying device 11 has basically the same structure as that of the first embodiment, but the installation directions of the four punch heads 3 are upward and downward. In order to correspond to this, the cutting bar 11f for cutting out the nut 1 from the casing 11k so as to supply the upward-pointing nut 1 and the downward-pointing nut 1 has a pocket 1 into which one nut 1 is inserted.
Two 1g and 11m are provided, and the cutting bar 11
Since the nut 1 cut out by f is supplied to the upward punch head 3 and the downward punch head 3 via the nut supply device 12, two nut transport tubes 11 are provided.
a and 11b are provided. Note that, of the two nut transport tubes 11a and 11b, one nut transport tube 11a needs to transport the nut 1 whose vertical direction is different from that of the other nut transport tube 11b. It is twisted 180 °. The casing 11k has a gate 11 that restricts the nut 1 from the pockets 11g and 11m of the cut-out bar 11f so that the nut 1 does not enter the nut transport tubes 11a and 11b.
c and 11d are provided.

Next, the operation of this embodiment will be described.
In the operation of this embodiment, the operation of attaching the nut 1 to the work 2 by using the punch head 3 and the anvil head 4 is the same as that of the first embodiment, and therefore its explanation is omitted.

The large work 2 to be supplied to the apparatus is loaded in the supply work loading unit 16a with its end surface in contact with the positioning bar 16C. The elevating device 16e of the work loading device 16 receives the instruction from the control device 14 and descends to a position where the large work 2 can be adsorbed. When reaching this point, the suction pad 16f of the work carrier 16i adsorbs the large work 2. At this stage, work carrier 1
Pin 16g of the positioning device 16h provided in 2i
Is inserted into the positioning hole 2d of the large workpiece 2. Then, as shown in FIG. 21, while maintaining this state, the elevating device 16e together with the large work 2 and the work carrier 16i moves up to the original position, and then the linear guide 16
Moving in the x direction along d, the large work 2 is placed on the work table 15a.

As soon as the large work 2 is placed on the work table 15a, suction of the large work 2 by the suction pad 16f is stopped, the positioning device 16h of the work carrier 16i is driven, and as shown in FIG. The large work 2 is positioned with respect to the work table 15a. In this positioning, the pin 16g inserted in the positioning hole 2d of the large work 2 is moved by the positioning device 16
By moving h in the J direction by the cylinder 16k and rotating it about the rotation axis j by θ, the large work 2 moves in the x and y directions, and the stopper 15c attached to the work table 15a and two clamps. 15b,
It is performed by abutting three points of 15b.

Generally, when the large work 2 is positioned, the suction pad that sucks the large work 2 is moved, or the end surface of the large work 2 is pushed by a cylinder or the like. However, in order to move the suction pad to a desired position, the lifting device 16e must be moved not only in the x direction but also in the y direction, which is not a good idea because the device becomes large. Further, when the end surface of the large work 2 is pushed by the cylinder, the deformation amount of the large work 2 inevitably increases,
High precision nut installation cannot be performed. Therefore, in this embodiment, when positioning, the lifting device 16e is not moved and only the pin 16g is moved to reduce the size of the device and the positioning hole 2 into which the pin 16g is inserted.
d is formed relatively close to the stopper 15c, etc.,
Stopper 15c acts on the point of action of the moving force applied to the large workpiece
The deformation amount of the large work 2 is reduced by positioning the large work 2 near the same position.

The large work 2 positioned on the table body 15g is gripped by the clamp device 15b. Then, the clamp device 15b holding the large work 2 moves in the y direction along the guide rail 15e, and the large work 2 is positioned between the punch head 3 and the anvil head 4.

The large work 2 moves y on the table body 15g.
23A, the spherical wear-resistant material 15 provided at the tip of the elongated elastic body 15i when moving in the direction.
Slide on h and move while maintaining a constant work level.

By the way, for example, in the case where a spherical bearing is provided on the table body, when the large work 2 is to be moved and the nuts 1 are mounted on both sides of the large work 2, the spherical work comes into contact with the spherical bearing. On the surface
Since the concavity and convexity are formed by the nut 1, the large work 2 moves up and down during movement, and the work level cannot be maintained constant. In addition, the nut 1 may come off due to an impact due to the vertical movement of the large workpiece 2.

However, in this embodiment, the table body 15
An elongated elastic body 15i is provided on g and its elastic force S [N
/ Cm ² ] is set to the value shown in (Equation 1),
As shown in FIG. 23B, the elongated elastic body 15i is deformed with respect to the nut 1 protruding from the large work 2, so that the large work 2 does not move up and down during movement.
Therefore, the work level can be maintained constant, and the nut 1 causes the large work 2
It does not come off.

In order to obtain such an effect, even if the elongated elastic body 15i is not used as the elastic body,
If (Equation 1) is satisfied, for example, FIGS.
As shown in FIG.
It is also possible to use the one to which k is attached, or a brush 1 constituted by bundling a plurality of 66-nylons or the like as shown in FIGS. 25 (A) and 25 (B).

On the other hand, similarly to the first embodiment, the nut 1 is supplied from the nut aligning device 6 to the nut carrying device 11 through the carrying guide 7a. The nut 1 supplied from the conveyance guide 7a is supplied to the hole 11g of the cutout bar 11f, as shown in FIG.
When i is driven to move the cutting bar 11f in the direction K, the nut 1 is moved to the air tube 11e, and then is fed into the nut transport tube 11a by the force of the air E. At this time, since the gate 11c on the other air tube 11b side is closed, the nut 1
Is not supplied. When carrying the nut 1 in the pocket 11m, the gate 11d may be closed and the gate 11c may be opened.

The nut 1 passing through the conveying tube 11a changes its vertical direction by 180 ° due to the twisting of the tube in the process of passing therethrough, and is supplied to the nut supplying device 12 for supplying the nut 1 from the upper side to the punch head 3. .. The nut 1 passing through the other air tube 11b is supplied to the nut supply device 12 that supplies the nut 1 to the punch head 3 from below without changing its direction.

After the nut 1 and the large work 2 are positioned at the desired positions, they operate in the same manner as in the first embodiment.

In this embodiment, as shown in FIG. 21, different nut sizes can be handled.
A nut aligning device and the like that can handle nuts of different sizes from the nut aligning device 6 are provided on the right side of the frame 10 in FIG. So, for example,
It is possible to realize a nut mounting device capable of automatically mounting M3 and M4 size nuts on a large-sized work from both sides, thereby improving work efficiency.

[0102]

According to the present invention, since the nut can be accurately supplied to the center of the punch head, the nut can be prevented from being displaced and the nut can be securely attached to the work. Also, when the pilot hole of the work is off the central axis of the punch head and the anvil head,
Since the nut is guided to the position of the prepared hole, the nut can be securely attached to the work.

Further, in the case of having the work restraining mechanism, the position shift of the work can be prevented, and the nut can be more surely attached to the work.

[Brief description of drawings]

FIG. 1 is a sectional view of a nut mounting head of an embodiment according to the present invention.

FIG. 2 is a sectional view of a punch head according to an embodiment of the present invention.

FIG. 3 is an overall side view of a nut mounting device according to an embodiment of the present invention.

FIG. 4 is a view on arrow I in FIG.

FIG. 5 is an explanatory diagram for explaining a structure of a nut alignment device according to an embodiment of the present invention.

FIG. 6 is a sectional view of a nut carrying guide according to an embodiment of the present invention.

FIG. 7 is a cross-sectional view of a nut carrying device according to an embodiment of the present invention.

FIG. 8 is a sectional view of a nut supply device according to an embodiment of the present invention.

FIG. 9 is an explanatory diagram for explaining the operations of the punch head and the anvil head according to the embodiment of the present invention.

FIG. 10 is an explanatory diagram for explaining the operations of the punch head and the anvil head according to the embodiment of the present invention.

FIG. 11 is an explanatory diagram for explaining the operations of the punch head and the anvil head according to the embodiment of the present invention.

FIG. 12 is an explanatory diagram for explaining the operations of the punch head and the anvil head according to the embodiment of the present invention.

FIG. 13 is an explanatory diagram for explaining the operations of the punch head and the anvil head according to the embodiment of the present invention.

FIG. 14 is an explanatory diagram for explaining an operation of detecting a poorly mounted nut according to the embodiment of the present invention.

FIG. 15 is an explanatory diagram for explaining an operation for detecting various abnormalities in the embodiment according to the present invention.

FIG. 16 is an explanatory diagram for explaining an operation for detecting various abnormalities in the embodiment according to the present invention.

FIG. 17 is an explanatory diagram for explaining an operation for detecting various abnormalities in the embodiment according to the present invention.

FIG. 18 is an explanatory diagram for explaining an operation for detecting various abnormalities in the embodiment according to the present invention.

FIG. 19 is an explanatory diagram for explaining an operation for detecting various abnormalities in the embodiment according to the present invention.

FIG. 20 is an overall side view of a nut mounting device according to another embodiment of the present invention.

FIG. 21 is a view on arrow II in FIG. 20.

FIG. 22 is a sectional view of a nut carrying device according to another embodiment of the present invention.

FIG. 23 is an explanatory diagram for explaining the operation of the work table of another embodiment according to the present invention.

FIG. 24 is an explanatory diagram for explaining the operation of the work table of still another embodiment according to the present invention.

FIG. 25 is an explanatory diagram for explaining the operation of the work table of still another embodiment according to the present invention.

FIG. 26 is an explanatory diagram for explaining the operation of the positioning device provided in the lifting device of another embodiment according to the present invention.

FIG. 27 is an explanatory diagram for explaining how to handle the self-clinching nut.

FIG. 28 is an overall front view of a conventional nut mounting device.

FIG. 29 is an explanatory diagram for explaining a nut mounting operation in the conventional nut mounting device.

[Explanation of symbols]

1 ... Nut, 2 ... Workpiece, 2a ... Prepared hole, 3 ... Punch head, 3a ... Punch core, 3b ... Cap, 3c ... Magnet,
3d ... Color, 3e ... Work clamp, 3f ... Bearing, 3g
… Cylinder, 4… Anvil head, 4a… Anvil, 4
b ... Floating shaft, housing 4c ... Housing, 4d ... Constant output actuator, 4e, 4f ... Sensor, 4g ... Head body, 5 ... Location pin, 6 ... Nut alignment device, 6a ... Guide, 7 ... Nut transport device, 7
a ... Nut transport guide, 7b, 7c ... Sensor, 8, 9 ...
Pressurizing device, 15a ... Work table.

Claims (14)

[Claims] 1. A self-clinching nut mounting device for mounting a self-clinching nut on a workpiece after inserting the self-clinching nut into a prepared hole formed in the workpiece in advance. In the punch head for pressing the self-clinching nut against the workpiece, the punch head is provided on a surface of the self-clinching nut which is in contact with the punch head.
A punch core formed with magnetic poles different from each other and having magnetic flux density distributions symmetrical to each other on the surface, and a side of the punch core that is in contact with the self-clinching nut formed of a non-magnetic material. And a punch cap having a sliding surface on which the self-clinching nut slidable is formed.
Nut mounting device. 2. The punch core is formed by including a core body made of a magnetic material and a magnet provided inside the core body, wherein the core body has the self-clinching nut of the self-clinching nut. The self-clinching nut mounting device according to claim 1, wherein a gap is formed on the contacting side so that the magnetic flux density distributions of the magnetic poles different from each other are symmetrical. 3. The self-clinching member is provided on the sliding surface of the punch cap from the direction in which the magnetic poles different from each other are lined up.
The self-clinching tool according to claim 1 or 2, further comprising a nut supply means for supplying a nut.
Nut mounting device. 4. A self-clinching nut mounting device for mounting a self-clinching nut on a workpiece after inserting the self-clinching nut into a pre-formed hole formed in the workpiece beforehand. In the punch head for pressing the self-clinching nut against the work, the punch head is provided with a holding means for holding the self-clinching nut so that the self-clinching nut is movable in a direction substantially perpendicular to the pressing direction. The anvil head, which is pressed in the direction opposite to the pressing direction of the ring nut, is formed so that it can be inserted into the pilot hole of the workpiece, and
A location pin whose tip is formed so as to be inserted into a screw hole of the self-clinching nut, and a surface of the workpiece opposite to a side into which the self-clinching nut is inserted, and the location pin An anvil that movably restrains the work in the pressing direction of the workpiece, and the anvil that supports the location pin,
An anvil lock mechanism that movably supports the work in a direction substantially perpendicular to the pressing direction of the work and locks the anvil immovably when the location pin is inserted into the pilot hole of the work; On the other hand, the self-clinching nut mounting device is provided with an actuator that applies a constant force in the pressing direction of the work. 5. The punch head has a surface on a side where the self-clinching nut contacts,
A punch core formed with magnetic poles different from each other and having magnetic flux density distributions symmetrical to each other on the surface, and a side of the punch core that is in contact with the self-clinching nut formed of a non-magnetic material. And a punch camp on which at least the surface of the self-clinching nut is slidable, the slidable surface being formed on the surface of the self-clinching nut. The self-clinching nut mounting device according to claim 4, wherein the surface is provided with a nut supplying means for supplying the self-clinching nut. 6. The self-clinching nut mounting device according to claim 4, further comprising a sensor for detecting a position of the location pin in the work pressing direction with respect to the anvil. 7. An alarm is issued when the position of the location pin in the work pressing direction is different from the position of the location pin in each step when the self-clinching nut is accurately attached to the work. 7. The self-clinching nut mounting device according to claim 6, further comprising warning means. 8. A sensor for detecting whether or not the self-clinching nut has been supplied to the punch head, according to any one of claims 1, 2, 3, 4, 5, and 6.
Or the self-clinching nut mounting device described in 7. 9. A work restraint mechanism for restraining the work immovably.
Self-clinching nut mounting device according to 3, 4, 5, 6, 7 or 8. 10. A storage means for storing the position of the pilot hole on the workpiece, and the workpiece is conveyed such that the pilot hole is at a target position based on the stored position of the pilot hole. And a work supply means.
Self-clinching nut mounting device according to 3, 4, 5, 6, 7, 8 or 9. 11. The self-clinching nut is stored from a plurality of stored self-clinching nuts.
In the process of supplying the nut to the punch head, a tube having an inner size corresponding to the outer dimension of the self-clinching nut is provided, and the air flow rate at which the self-clinching nut can be conveyed to the tube. 11. The self-clinching nut mounting device according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, further comprising an air blow device for supplying the air. 12. A work table is provided on which the work moves while being in contact therewith, and on the work table, a deforming member that is deformed when pressed by a convex portion of the work is provided. Self-clinching nut mounting device according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11. 13. A work table on which a work having one or more projections provided on its surface is placed, and at least the projections in a direction in which a load is applied to the work when pushed by the projection of the work. A work table provided with a deforming member that is deformed by the height of the work table. 14. The work table according to claim 13, wherein the deformable member is an elongated elastic material having a wear-resistant material provided at a tip thereof.