JP2001205524A - Nut driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To position a workpiece easily and quickly and drive a nut in position accurately. SOLUTION: When a nut supply guide 10 with a passage 11 where a driving punch 1 is slidably inserted and with a nut supply port 12 perpendicular to the passage 11 is in an advanced position, a nut N is fed to a supply position at the point of the driving punch 1 via the nut supply port 12. After an axially retractile positioning pin 20 in the point of the driving punch 1 is projectingly passed through the threaded hole of the nut N, a small positioning hole 30 cut in advance in a nut mounting position of a metal plate W is fitted about the projected portion. With the nut supply guide 10 retracted by drive means 14 along the axis of the driving punch 1, the driving punch 1 cooperates with a crimping die 2 to drive and fix the nut N into the metal plate W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut driving device used for driving and fixing a pierce nut or a clinch nut to a workpiece made of a metal plate.

[0002]

2. Description of the Related Art Heretofore, when a pierce nut or a clinch nut is driven into a metal plate work and fixed thereto, the work is positioned by abutting an outer edge of the work against a stopper or the like. Such a positioning method is suitable for mass production in which many same workpieces are produced at the same time, but when the setup must be changed frequently in small lots, such as a large variety of small workpieces, the positioning work It took a lot of trouble and was unsuitable.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to easily and quickly position a work, and to accurately drive and fix a nut at a predetermined position of the work. It is an object of the present invention to provide a nut driving device capable of performing the following.

[0004]

In order to achieve the above object, a nut driving device according to the present invention comprises a driving punch for driving a nut into a metal plate, and a swaging die facing the driving punch with the metal plate interposed therebetween. A nut supply guide having a passage through which the driving punch is slidably inserted and a nut supply port orthogonal to the passage; and a driving means for moving the nut supply guide forward and backward in the axial direction along the driving punch. When the nut supply guide is at the forward position, the nut supplied through the nut supply port is fed to a feed position at the tip of the driving punch, the nut supply guide retreats, and the driving punch And the caulking die cooperate to drive and fix the nut to the metal plate. Te, provided retractably along the axial core to the tip portion of the punch positioning pins the driving, after the nut has been fed to the feed position of the driving punch tip,
With the positioning pin protruding through the screw hole of the nut and fitting a positioning hole provided at a nut mounting position of the metal plate to the protruding portion, the nut is fixed to the metal plate. It is characterized by being driven and fixed to W.

The positioning pin is inserted through a through-hole provided along the axis of the driving punch, and is protruded and retracted from an end surface of the driving punch by an air cylinder provided at a rear portion of the driving punch. It is configured to be.

A pair of elastic claws are provided on both sides of the tip of the driving punch so that a nut fed to the feeding position is gripped and held by the pair of elastic claws. Is preferred.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a nut driving device according to the present invention. The nut driving device includes a driving punch 1 for driving a pierce nut or a clinch nut (hereinafter simply referred to as a nut) N into a workpiece W made of a metal plate. And a caulking die 2 opposed to the driving punch 1 with the work W interposed therebetween.

The driving punch 1 has a rear end portion fixed to a back plate 4 via a punch holder 3 and the back plate 4 is set on a base (not shown) of a press machine, and the axis thereof is set in a vertical direction. And projecting upward. Further, a pair of opposing elastic claws 5 and 5 are provided on both sides of the tip end of the punch-in punch 1 (see FIGS. 2 and 4). The two elastic claws 5 and 5 are formed by fixing a leaf spring piece to a side surface of the driving punch 1 with a screw (not shown), and the nut N supplied to a nut feeding position formed on the distal end surface of the driving punch 1 is used. The nut N is correctly positioned at the feeding position by a stopper piece 6 which is gripped by the two elastic claws 5 and 5 and protrudes from the rear end of the punch 1.

On the other hand, the caulking die 2 is attached to a press ram (not shown) of a press machine, and is opposed and coaxially arranged above the punch 1.
It reciprocates in the axial direction in conjunction with the press ram, and moves toward and away from the driving punch 1.

The driving punch 1 has a nut supply guide 10
Are slidably mounted in the axial direction. The nut supply guide 10 has a passage 11 formed in a through hole through which the driving punch 1 is slidably inserted in the axial direction, and a nut supply port 12 orthogonal to the passage 11.
The nut N is continuously supplied through the nut supply hose 13, and the nut N is supplied from the nut supply port 12 to the tip of the driving punch 1 located in the passage 11. The paper is sequentially fed to the feeding position.

The nut supply guide 10 is moved up and down along the driving punch 1 by an air cylinder 14 fixedly mounted on the back plate 4. The air cylinder 14 is a double-acting type. A piston rod 15 extends in parallel with the driving punch 1, and a nut supply guide 10 is connected to a tip portion thereof. In the axial direction along the axis (up and down in the illustrated example). When the nut supply guide 10 is at the raised position shown in FIGS. 1 and 2, the nut N supplied through the nut supply port 12 is at the nut feeding position at the tip of the driving punch 1 located in the passage 11. Will be fed.

In the nut driving device according to the present invention, a positioning pin 20 is provided on the driving punch 1 so as to be able to reciprocate along the axis, and a tip portion 20a of the positioning pin 20 is provided.
It is designed to protrude from the front end face. The positioning pin 20 is axially slidably inserted into a through hole 21 provided along the axis of the driving punch 1, and a rear end portion 20.
b is connected to a piston 23 of an air cylinder 22 provided at the rear of the driving punch 1 and
The distal end portion 20a is urged by the pressing spring 24 fitted into the inside 2 into the through hole 21 from the distal end surface of the driving punch 1 (see FIG. 1). And the air passage 25
By pressing the piston 23 with the pressurized air supplied through the pressing pin 24 and pushing up the positioning pin 20 against the pressing spring 24, the distal end portion 20 a of the positioning pin 20 is configured to protrude from the distal end surface of the driving punch 1. ing.

Next, the operation of the nut driving device according to the present invention configured as described above will be described. FIGS. 1 and 2 show the feeding state of the nut N, in which the nut supply guide 10 is in the ascending position and the foremost nut N in the group of nuts N continuously supplied through the nut supply hose 13.
Is fed from the nut supply port 12 to the nut feed position at the tip of the driving punch 1 located in the passage 11, and is gripped by the elastic claws 5 and 5. At this time, the positioning pin 20
As shown in the figure, the tip portion 20a is immersed into the through hole 21 from the tip end face of the driving punch 1, so that the feeding of the nut N is not hindered.

Next, as shown in FIGS. 3 and 4, the air cylinder 14 operates to lower the nut supply guide 10, and pressurized air is supplied into the air cylinder 22. The positioning pin 20 is pushed up and the nut is ready to be driven. At this time, positioning pin 2
The leading end portion 20a of the punch N protrudes from the leading end surface of the driving punch 1, the posture is regulated by the stopper piece 6 at the front feeding position, and the penetrating protrusion protrudes through the screw hole of the nut N gripped by both elastic claws 5, 5. I do. On the other hand, the work W
The positioning small hole 30 is provided at the position where the is driven.

In the above-described nut driving preparation state, the work W is supplied between the driving punch 1 and the caulking die 2, and the positioning holes 30 are fitted to the distal end portions 20a of the positioning pins 20 protruding from the nut N. (See FIG. 5).

Subsequently, as shown in FIG. 6, when the caulking die 2 is lowered and pressed so as to pinch the work W in cooperation with the driving punch 1, the nut N is driven into the work W by the driving punch 1. Is fixed. When the nut N is fixed to the work W, the caulking die 2 moves up, and the positioning pin 20 and the nut supply guide 10 return to the nut feeding state shown in FIG.

In the illustrated embodiment described above, the driving punch 1 is arranged and fixed below, and the caulking die 2 arranged above is moved up and down.
Can be arranged below and fixed, and the driving punch 1 arranged above can be moved up and down.

[0018]

As described above, according to the present invention,
A positioning pin incorporated in the driving punch penetrates through the screw hole of the nut fed to the feeding position at the tip of the driving punch, and is provided in advance at the nut mounting position of the workpiece (metal plate) at the protruding portion. In the state where the small holes for positioning are fitted, the nut is driven into and fixed to the work, so that the work for positioning the work can be performed easily and quickly, and the nut is positioned at a predetermined position on the work. It can be accurately driven and fixed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a nut feeding state of a nut driving device according to the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a vertical sectional front view showing a driving preparation state of the nut driving device.

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a vertical sectional front view showing a workpiece positioning state of the nut driving device.

FIG. 6 is a vertical sectional front view showing a nut driving state of the nut driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driving punch 2 Caulking die 5 Elastic claw 6 Stopper piece 10 Nut supply guide 11 Passage 12 Nut supply port 13 Nut supply hose 14 Air cylinder 20 Positioning pin 20a Tip part 20b Rear end part 21 Through hole 22 Air cylinder 23 Piston 24 Press spring 25 Air passage

Claims (3)

[Claims] 1. A driving punch for driving a nut into a metal plate, a caulking die opposed to the driving punch with the metal plate interposed therebetween, a passage through which the driving punch is slidably inserted, and a nut perpendicular to the passage. A nut supply guide having a supply port, and driving means for moving the nut supply guide forward and backward along the driving punch in the axial direction thereof; and when the nut supply guide is at the forward position, the nut supply guide is provided through the nut supply port. The supplied nut is fed to a feeding position at the tip of the driving punch, and the nut supply guide retreats, and the driving punch and the caulking die cooperate to drive the nut into the metal plate to be fixed. In the nut driving device configured as described above, after the nut is fed to the feeding position at the tip of the driving punch, A female pin projects through the screw hole of the nut, and the nut is inserted into the metal plate W in a state in which the protruding portion is fitted with a positioning hole provided in advance at the nut mounting position of the metal plate. Nut driving device characterized by being driven into and fixed to a nut. 2. The positioning pin is attached by being inserted into a through hole provided along an axis of the driving punch,
2. The nut driving device according to claim 1, wherein the driving device is configured such that an air cylinder provided at a rear portion of the driving punch allows the driving punch to protrude and retract from a distal end surface of the driving punch. 3. A pair of elastic claws facing each other on both sides of the tip of the driving punch, and a nut fed to the feeding position is gripped and held by the pair of elastic claws. The nut driving device according to claim 1 or 2, wherein