JP2001105252A - Parts press-fitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parts press-fitting device for ensuring press-fitting of parts in position while correctly holding a work in position at all times. SOLUTION: This device comprises a press-fit unit for holding hollow parts having a hollow hole and pressing them in a lower hole of a work and a work holder capable of holding the work in position. A positioning shaft 69 which has a large diameter portion 69a fittable to the lower hole of the work and a small diameter portion 69b associated with the large diameter portion 69a and fittable to the hollow hole of the hollow portion is arranged at the position of the work held by the work holder. The positioning shaft 69 is energized to be protruded from a position where it is movable forward and backward to the axial direction and the large diameter portion 69a is fittable to the lower hole of the work at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component press-in device for positioning a work at a predetermined position and press-fitting a hollow component into a prepared hole provided in the work.

[0002]

2. Description of the Related Art Conventionally, when a metal part such as a nut is press-fitted into a work made of a thermoplastic resin material, a heating press-fitting device has been used. As this heating press-in device, a press-in device disclosed in Japanese Patent Application Laid-Open No. 9-267223 previously created by the applicant is known. This press-fitting device arranges hollow metal parts in a cylindrical storage pipe extending vertically, and heats a storage block to which the storage pipe is connected by an electric heating element, so that the metal at the lower part of the storage pipe is heated. The parts are configured to be heated, and the heated metal parts are supplied and held one by one to the chuck unit by a separate supply unit, and the metal parts are pushed out onto the work by a stem that operates by being driven by a reciprocating drive source. Press-fitting. At the time of press-fitting, the metal component is press-fitted to a predetermined position by melting the work with its own heat.

[0003]

However, in the above-mentioned conventional press-fitting apparatus, when a pilot hole for press-fitting a metal part of the work is formed through the work, two or more of the work are placed on the work holding table. The work is held at a predetermined position by providing a pin corresponding to the pilot hole and engaging the pilot hole of the work with each pin. However, in such a configuration, the pin is often implanted and fixed at a predetermined position.However, when the metal component is pressed into the entire length of the prepared hole, the pin is not fixed. There have been problems such as being unable to press-fit the metal component to a predetermined position because of obstruction.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is a component press-fitting device capable of always correctly holding a work at a predetermined position and press-fitting a component to a predetermined position. The purpose is to provide. In order to achieve this object, the present invention is a component press-fitting device for press-fitting a hollow component having a hollow hole formed at least at one end thereof in a prepared hole provided in a workpiece, wherein the hollow component can be held and held. A press-fit unit configured to be capable of press-fitting the hollow part into the hole of the work, and a work holder configured to be capable of holding the work at a predetermined position; A large-diameter portion that can be fitted into a pilot hole in which the hollow component is not press-fitted, and a small-diameter portion that is connected to the large-diameter portion and that can be fitted into the hollow hole of the hollow component that is press-fitted into the pilot hole of the work. A positioning shaft is disposed, and this positioning shaft is reciprocally movable in the axial direction thereof and is always urged so that the large-diameter portion can be fitted into a prepared hole of the work. is there.

[0005] In the above construction, contact detecting means capable of detecting the contact of the positioning shaft on the moving path of the positioning shaft is provided, and when the metal component is pressed into a predetermined position, the positioning shaft is connected to the contact detecting means. Preferably, it is configured to abut. In addition, contact detection means capable of detecting that a hollow component pressed into the workpiece is in contact with a prepared hole of the work which does not correspond to the positioning axis is provided at a work holding position of the work holder. Is also good.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 12, reference numeral 1 denotes a component for press-fitting a metal hollow component P having a hollow hole opened at at least one end surface, such as a metal nut, into a work made of a thermoplastic resin material. A press-fitting device, a magazine unit 10 for arranging and storing a plurality of the hollow parts P, and a three-axis orthogonal coordinate robot R (hereinafter, referred to as a robot) disposed adjacent to the magazine unit.
A robot R), a press-fit unit 20 attached to the robot R, a heating unit 50 for heating the hollow part P, and a work holder 60 for holding a work at a predetermined position. Hereinafter, these components will be described in detail.

[0007] The magazine unit 10 has a magazine table 12 for holding a magazine 11 in which a plurality of hollow parts P are arranged. The magazine table 12 is located at a magazine receiving position M adjacent to a magazine supply conveyor (not shown).
1 and a component take-out position M2 by the press-fit unit 20 are configured to be slidable, and a magazine receiving position M
In 1, the magazine 11 is exchanged with a magazine supply conveyor.

圧 Press-fit unit The press-fit unit 20 is a Z-axis movable portion R1 of the robot R.
The work tool 22 and the air cylinder 23 are rotatably arranged on a main frame 21 connected to the main frame 21. The work tool 22 includes a main frame 21.
A rotating frame 24 rotatably supported by a support shaft 21a, an air cylinder 25 disposed on the rotating frame 24, and a press-fit head 26 connected to a piston rod 25a of the air cylinder 25. The tip of the piston rod 23a of the air cylinder 23 is rotatably connected to the rotating frame 24. That is, the work tool 22 is
When the piston rod 23a of FIG.
As shown in FIG. 2, the rotary shaft is rotated by 90 °, so that the press-fitting operation in the horizontal and horizontal directions can be performed. The turning operation of the work tool 22 is performed in a turning area T adjacent to the heating unit and the work holder.

The press-fit head 26 includes a support table 27 connected to the tip of a piston rod 25a of the air cylinder 25, a centering device 28 connected to the support table 27, and a centering device 28.
Heat insulation block 29 attached to the
9 and an air injection nozzle 31 supported by the centering device 28
It is composed of

The centering device 28 is configured to support the heat insulating block 29 in a floating state, so that the heat insulating block 29 and the component holding unit 30 can move a little in a horizontal plane. The heat insulating block 29 is made of a heat insulating material 2 made of a material having a low thermal conductivity, such as a heat insulating ceramic.
9a is incorporated in the connection position of the component holding unit 30, so that heat conduction from the component holding unit 30 is minimized. Further, the air jet nozzle 31 is disposed with its tip directed to the vicinity of a lower portion of a reference member 34 described later, and injects air from the tip in response to the operation of an air supply source (not shown). It is configured.

Further, the component holding unit 30 has a pressing bush 3 whose upper part is covered with the heat insulating material 29a and which is integrally fixed to the heat insulating block 29 by a screw part 29b.
2 and a holding rod 3 inserted in the pressing bush 32.
3 is provided. The holding rod 33 has a shape capable of entering the hollow hole of the hollow component P, and is urged to always protrude from the pressing bush 32 by a spring 34 stored in the pressing bush 32. A storage groove 33a is formed in the holding rod 33, and a locking member 35 is rotatably supported in the storage groove 33a. The locking member 35 is urged by a spring 36 so that the locking piece 35a at the tip always projects from near the holding rod 33 side tip, and when the holding rod 33 is inserted into the hollow hole of the hollow component P, The locking piece 35a is pressed against the hollow hole, whereby the hollow component P can be held.

Heating Unit The heating unit 50 has a heating system (not shown) built in a housing 51, and a coil 52 projecting from the housing 51 is connected to the heating system. The coil 52 is formed to have an inner diameter and an overall length capable of containing the portion to be heated of the hollow part P, and a high-frequency current is supplied from the heating system 51 to the coil 52 to generate a magnetic flux, which is inserted into the coil 52. An eddy current is generated in the hollow part P by an electromagnetic induction action by concentrating on the hollow part P, and the heat generated by the hollow part P itself causes the hollow part P to generate an eddy current.
Is to be heated. Further, a non-contact type temperature sensor 54 is provided on the housing 51 via a bracket 53,
The detection surface is arranged to face the position above the coil 52, and the temperature sensor 54 can detect the temperature of the hollow part P taken out of the coil 52.

The work holder 60 includes an index table 62 connected to a slide unit 61, a pedestal 63 disposed on the index table 62, and a pedestal 63.
And a work table 64 arranged on the upper side and configured to hold the work W.
The work table 64 is horizontally moved by the operation of (1), and is positioned at the work acquisition position W1 and the press-fitting work position W2 adjacent to the rotation area T. Are rotated on a horizontal plane, and the work W held on the work table 64 can be changed in direction and positioned.

The pedestal 63 is provided with two plates 63a and 63b arranged in parallel. The pedestal 63 is provided with a plurality of simple contacts 65 and positioning / contacts 67 extending to the work table 64. Have been.

The simple contact 65 is connected to the plate 63a.
Has a conductive metal terminal 66 attached via a non-conductive bush 65a, and a lead 67 leading to a control unit (not shown) is connected to a lower portion of the terminal 66. The upper portion of the metal terminal 66 is connected to the work table 64 via a non-conductive bush 65b, and the upper end surface of the metal terminal 66 is configured to be exposed on the upper surface of the work table 64.

The positioning contact 68 is provided on a conductive positioning shaft 69 slidable by being guided by a non-conductive bush 68a disposed on the plate 63a, and on a plate 63b below the positioning shaft 69. And a conductive metal terminal 70. A lead wire 71 leading to the control unit is connected to the lower part of the metal terminal 70, similarly to the simple contact 65.

The tip of the positioning shaft 69 is
Has a two-stage structure including a large-diameter portion 69a that can be fitted into a predetermined pilot hole h and a small-diameter portion 69b that can be fitted into the hollow hole of the hollow part P. The spring 7 always projects so as to protrude above the work table 64.
2 energized. A non-conductive bush 68b is provided at a position on the work table 64 where the positioning shaft 69 is inserted, and the bush 68b insulates the positioning shaft 69 from the work table 64.

A flange member 73 is integrally fixed to the lower portion of the positioning shaft 69.
The positioning shaft 69 is always in contact with the lower end of the bush 68a under the bias of the spring 72. In this position, the flange member 73 is detected by a sensor 74 arranged on the plate 63a. The simple contact 65 and the positioning / contacting contact 68 are provided so as to communicate with the pilot hole h for component press-fitting of the work W when the work W is placed on the work table 64.

When the hollow component P is press-fitted into the work W using the heating press-fitting device 1, first, the magazine table 12 of the magazine unit 10 moves to the magazine receiving position M1, receives the magazine 11, and receives the component unloading position M2. Is positioned backward. At the same time, the work table 64 of the work holder 60 moves to the work supply position W1 by the operation of the slide unit 61 and receives the work W.

The simple contact 65 or the positioning contact 68 is located below the pilot hole h of the work W arranged on the work holder 64, and the pilot hole h corresponding to the positioning contact 68 has a large positioning shaft 69. The diameter part 69a is fitted. By fitting the positioning shaft 69 into the prepared hole h, the work W is accurately positioned and held at a predetermined position on the work table 64. At this time, if the work W is not properly placed at a predetermined position on the work table 64, the positioning shaft 69 does not fit into the pilot hole h and the work W
, And moves downward.
Is out of the detection area of the sensor 74. Therefore, it is possible to confirm whether or not the work W is arranged at a correct position. If the work W is not properly held, the position of the work W can be quickly corrected.

When the work W is held, the work table 6
4 is a press-fitting work position W due to the backward movement of the slide unit 61.
Move to 2. Subsequently, the press-fit unit 20 is moved to the magazine 11 by the operation of the robot R, and the holding rod 33 of the component holding unit 30 is inserted into the hollow hole of the predetermined hollow component P. As a result, the locking piece 35a of the locking member 35 is pressed against the inner wall of the hollow hole of the hollow component P.
3 can hold the hollow part P.

Thereafter, the press-fit unit 20 moves to the heating unit 50 by the operation of the robot R, and inserts the hollow part P into the coil 52 together with the holding rod 33. A high-frequency current is supplied to the coil 52 by the operation of the heating system. Therefore, the hollow component P inserted into the coil 52 is heated to a corresponding temperature by an electromagnetic induction effect of the high-frequency current. At this time, the component holding unit 30 is provided by the heat insulating material 29a.
The heat conduction from the robot R and the press-fit unit 20 can be prevented from being thermally degraded.

The heating time of the hollow part P in the heating unit 52 is controlled by a control unit (not shown). When this heating time elapses, the press-fit unit 20 rises by the operation of the robot R to remove the hollow part P. Coil 5
Remove from 2. When the hollow part P is removed from the coil 52, the temperature of the hollow part P is measured by the temperature sensor 54. If the hollow part P is not heated to a predetermined temperature, the hollow part P is removed, and the press-fit unit 20 retakes another hollow part P and re-enters the magazine unit 1.
After returning to 0, another hollow part P is held and the above-described heating operation is repeated.

When the hollow part P is heated to a predetermined temperature, the press-fit unit 20 moves to the work holder 60 by the operation of the robot R, and as shown in FIG. Is positioned above the pilot hole h.

Subsequently, the air cylinder 25 is actuated to lower the press-fit head 26, and the hollow part P is moved to the lower hole h of the work W.
Press into the entrance. As a result, the hollow component P is pressed into the work W while melting the peripheral portion of the prepared hole h of the work W. At this time, the holding rod 33 compresses the spring 34 by press-fitting resistance and escapes into the pressing bush 32 as shown in FIG. For this reason, the distal end surface of the pressing bush 32 contacts the hollow component P.

When the hollow component P is press-fitted, the component holding unit 30 can slightly move in the horizontal plane by the action of the centering device 28. Therefore, the work W
By correcting the deviation between the center of the pilot hole h and the center of the hollow component P, the hollow component P can be properly press-fitted. Therefore, even when the work W is formed by casting and the actual position of the pilot hole h is slightly shifted from the designed pilot hole position, the hollow component P is press-fitted along the pilot hole h. be able to.

When the pilot hole h corresponds to the simple contact 65, when the hollow component P is press-fitted to a predetermined position, the lower end surface of the hollow component P contacts the metal terminal 66. A weak current is applied to the metal terminal 66 from the control unit through the lead wire 67, and the contact of the hollow component P causes a change in the current value. Thereby, it can be detected that the hollow component P is press-fitted to the predetermined position.

In the case where the pilot hole h corresponds to the positioning contact 68, as shown in FIG. Are fitted, and the positioning shaft 69 is pushed down. When the hollow part P is press-fitted to a predetermined position, the positioning shaft 69 comes into contact with the lower metal terminal 70. This metal terminal 70 has the same structure as the simple contact 65 described above.
Since a weak current is applied in advance, it can be detected that the hollow component P has been pressed into the predetermined position by the contact of the positioning shaft 68. At this time, since the small diameter portion 69b of the positioning shaft 69 is fitted to the hollow part P, the hollow part P
Can be continuously positioned and held correctly at a predetermined position even after the press-fitting is performed.

As described above, when it is detected that the hollow part P is press-fitted to the predetermined position, the operation of the air cylinder 25 is stopped in response to this, and the press-fit head 26 is temporarily stopped at that position. Will be retained. Meanwhile air injection nozzle 3
From 1, compressed air is injected, whereby the work W melted by the heat of the hollow part P is cooled and solidified, and the vicinity of the tip of the holding rod 33 is cooled. Then, after a certain time has elapsed, the press-fit head 26 is returned to the original position by the reciprocation of the air cylinder 25. Then, press-fit unit 2
0 is transferred to the magazine unit 10 for the next hollow part P by the operation of the robot R, and thereafter, the hollow part P is press-fitted into the remaining prepared hole h of the work W by the same operation as described above.

[0030]

According to the component press-fitting device of the present invention, when the hollow part is not press-fitted into the prepared hole of the work, the large-diameter portion of the positioning shaft is fitted into the prepared hole of the work, and the hollow is inserted into the prepared hole. When the component is press-fitted, the small diameter portion fits into the hollow hole of the hollow component, and the positioning shaft is pushed out from the pilot hole. Therefore, there is an advantage that the work can be correctly positioned at a predetermined position continuously even after the hollow component is press-fitted. Further, a contact detecting means is arranged on a moving path of the positioning shaft which is pushed and moved by the hollow component, and is configured such that when the hollow component is pressed into a predetermined position, the positioning shaft comes into contact with the contact detecting device. . Therefore, there is an advantage that the hollow component can be accurately press-fitted to a predetermined position while always correctly positioning the work.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of a main part showing a vicinity of a part D in FIG.

FIG. 2 is an enlarged front view of a work holder in the component press-fitting device according to the present invention.

FIG. 3 is a plan view of the component press-fitting device according to the present invention.

FIG. 4 is a front view of the component press-fitting device according to the present invention.

FIG. 5 is an enlarged view of a magazine unit in the component press-fitting device according to the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 6 is a partially cutaway enlarged front view of a press-fitting unit in the component press-fitting device according to the present invention.

FIG. 7 is a partially cutaway enlarged side view of a press-fitting unit in the component press-fitting device according to the present invention.

FIG. 8 is an operation explanatory view of the component press-fitting device according to the present invention.

FIG. 9 is a partially cutaway enlarged sectional view of a component holding unit in the component press-fitting device according to the present invention.

FIG. 10 is an enlarged view of a heating unit in the component press-fitting device according to the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 11 is an operation explanatory view of the component press-fitting device according to the present invention.

FIG. 12 is an operation explanatory view of the component press-fitting device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating press-in apparatus of metal parts 10 Magazine unit 20 Press-in unit 23 Air cylinder 25 Air cylinder 30 Parts holding unit 31 Air injection nozzle 32 Pressing bush 33 Holding shaft 35 Engaging member 50 Heating unit 60 Work holder 65 Simple contact 68 Positioning / contact 69 Positioning axis 69a Large diameter part 69b Small diameter part R Robot W Work

Claims (3)

[Claims] 1. A component press-fitting device for press-fitting a hollow component having a hollow hole formed at least at one end thereof in a pilot hole provided in a work, wherein the hollow component capable of holding and holding the hollow component is formed in a hole of the work. And a work holder configured to be able to hold the work at a predetermined position. A hollow part of the work is press-fitted at the work holding position in the work holder. A positioning shaft having a large-diameter portion that can be fitted into a non-prepared hole and a small-diameter portion that is connected to the large-diameter portion and that can be fitted into a hollow hole of a hollow component that is press-fitted into a work lower hole is arranged. A component press-fitting device, wherein the positioning shaft is reciprocally movable in the axial direction thereof and is constantly urged so that the large-diameter portion can be fitted into a prepared hole of a work. 2. A contact detecting means for detecting contact of the positioning shaft with the positioning shaft is provided on a moving path of the positioning shaft. When the hollow component is pressed into a predetermined position, the positioning shaft contacts the contact detecting means. The component press-fitting device according to claim 1, wherein the component press-fitting device is configured to be in contact with the component. 3. A contact detecting means is provided at a work holding position of a work holder, the contact detecting means being capable of detecting that a hollow component to be press-fitted therein has come into contact with a prepared hole of the work which does not correspond to the positioning axis. 3. The method according to claim 2, wherein
A component press-fitting device according to item 1.