JP5583528B2 - Ultrasonic vibration unit, ultrasonic press-in device, and ultrasonic press-in method - Google Patents

Description

The present invention relates to an ultrasonic vibration unit and an ultrasonic wave that uses such an ultrasonic vibration unit and press-fits a pin as a press-fitting part while applying ultrasonic vibration into a hole provided in a work as a press-fit member. The present invention relates to a press-fitting device and an ultrasonic press-fitting method, and more particularly to a device devised so as to prevent the collapse of the posture of a press-fitting part (for example, twisting, tilting, etc.) during press-fitting operation and accurately press-fitting.

As an ultrasonic press-fitting device that press-fits a pin into a hole provided in a workpiece while applying ultrasonic vibration, for example, there are devices described in Patent Document 1, Patent Document 2, and the like.
The purpose of applying ultrasonic vibration during press-fitting is to reduce the press-fitting load.

Japanese Patent Laid-Open No. 50-36343

JP 2007-296615 A

The conventional configuration has the following problems.
That is, if ultrasonic vibration is applied to the pin during press-fitting, the posture of the pin may be lost (for example, twisting, tilting, etc.). If the press-fitting operation is continued in such a state, the posture remains broken. In this state, there was a problem that the pin was press-fitted into the hole of the workpiece.
For such a problem, for example, it is conceivable to use a fixing jig for preventing the pin posture from collapsing. However, when such a fixing jig is used, the ultrasonic vibration is attenuated, and there is a problem that the effect of reducing the press-fit load due to the addition of the ultrasonic vibration is impaired.

The present invention has been made on the basis of such points, and the object of the present invention is to maintain the posture of the press-fitted parts when ultrasonic vibration is applied without damaging the effect of reducing the press-fitting load due to the addition of ultrasonic vibration. It is an object of the present invention to provide an ultrasonic vibration unit, an ultrasonic press-in apparatus using such an ultrasonic vibration unit, and an ultrasonic press-in method.

In order to achieve the above object, an ultrasonic vibration unit according to claim 1 of the present invention comprises an ultrasonic vibrator and a horn connected to the ultrasonic vibrator, and an ultrasonic wave generated by the ultrasonic vibrator. in the ultrasonic vibration unit for outputting a vibration through the horn, a plurality of first grooves that are provided to cut out the tip portion at the distal end of the horn, said plurality a distal end of the horn A plurality of second grooves provided so as to cut out the tip portions at different positions along the circumferential direction and the axial direction with respect to the first groove of the first groove, and the plurality of first grooves The tip of the horn is rotated by the bending vibration generated and the bending vibration generated by the plurality of second grooves .
According to a second aspect of the present invention, in the ultrasonic vibration unit according to the first aspect, a pair of the first grooves are opposed to each other at a position of 180 °, and the second groove is also 180. A pair is opposed and arranged at a position of ° .
Further, the ultrasonic vibration unit according to claim 3 is the ultrasonic vibration unit according to claim 1 or 2, wherein the ultrasonic vibration unit is shifted in a circumferential direction within a range of 60 ° to 120 ° with respect to the first groove. The second groove is provided .
An ultrasonic vibration unit according to claim 4 is the ultrasonic vibration unit according to any one of claims 1 to 3 , wherein the ultrasonic vibration unit is generated by the bending vibration generated by the first groove and the second groove. The second groove is shifted in the axial direction with respect to the first groove so that the phase difference of the bending vibration is 60 ° to 120 ° .
The ultrasonic press-fitting device according to claim 5 is a press means provided with a rod that is moved back and forth, and the ultrasonic vibration unit according to any one of claims 1 to 4 attached to the tip of the rod. , And the rod is advanced by the pressing means so that the press-fitting part is press-fitted into the hole of the press-fitted member through the ultrasonic vibration unit .
Further, the ultrasonic press-fitting method according to claim 6 is the above-mentioned by pressing means in which a rod that is moved back and forth is provided and the ultrasonic vibration unit according to any one of claims 1 to 4 is attached to the tip of the rod. By pressing the press-fitted part through the ultrasonic vibration unit, the press-fitted part is pressed into the hole of the press-fitted member, and the posture of the press-fitted part is broken by the rotational movement of the horn tip of the ultrasonic vibration unit. It is characterized by preventing the above .

As described above, according to the ultrasonic vibration unit according to claim 1 of the present invention, in the ultrasonic vibration unit that outputs the ultrasonic vibration generated by the ultrasonic vibrator via the horn, the horn is provided with a groove. For example, when this is applied to an ultrasonic press-fitting device, bending vibration can be applied to the press-fitted parts, thereby preventing the posture from collapsing during press-fitting. can do.
The ultrasonic vibration unit according to claim 2 is the ultrasonic vibration unit according to claim 1, wherein a plurality of grooves are provided at different positions along the circumferential direction. For example, when this is applied to an ultrasonic press-fitting device, a plurality of bending vibrations in different directions can be applied to the press-fitting component, thereby preventing the posture from being collapsed during press-fitting. Can do.
According to a third aspect of the present invention, in the ultrasonic vibration unit according to the second aspect, the plurality of grooves are provided at different positions along the axial direction, so that a rotational motion can be generated. . In other words, multiple bending vibrations with different resonance frequencies are generated, and by bending the bending vibration and the longitudinal vibration resonance frequency of the ultrasonic vibrator close to each other, bending vibrations with different vibration displacement directions and phases during longitudinal vibration excitation. Occur at the same time, thereby generating a rotational motion at the tip of the horn. When this is applied to an ultrasonic press-fitting device, a rotary motion can be applied to the press-fitted parts, thereby preventing the posture from being lost during press-fitting.
According to a fourth aspect of the present invention, in the ultrasonic vibration unit according to the third aspect, there are a first groove and a second groove provided at different positions along the axial direction. Since the second groove is provided at a position shifted in the circumferential direction within a range of 60 ° to 120 ° with respect to the groove, the vibration displacement of the bending vibration can be obtained in a direction necessary to obtain the rotational motion. This makes it possible to make the above effect more reliable.
The ultrasonic vibration unit according to claim 5 is the ultrasonic vibration unit according to claim 4, wherein the phase difference of the bending vibration of the second groove is 60 ° to 120 ° with respect to the first groove. Thus, the rotational movement can be made closer to a circular orbit, and the above-described effect can be made more reliable.
According to a sixth aspect of the present invention, in the ultrasonic vibration unit according to the first aspect, since the groove is provided as an annular groove, the above effect can be obtained with a simple configuration.
According to a seventh aspect of the present invention, there is provided an ultrasonic press-fitting device comprising a press means and the ultrasonic vibration unit according to any one of the first to sixth aspects attached to the tip of the press means. Since the press-fitted part is press-fitted into the hole of the press-fitted member via the vibration unit, vibration in the bending direction can be applied to the press-fitted part, thereby preventing the collapse of the posture during press-fitting. .
Further, in the ultrasonic press-fitting method according to the eighth aspect, the ultrasonic vibration generated by the ultrasonic vibration is applied to the press-fitted part through the horn and is pressed by the pressing means so that the press-fitted part is inserted into the hole of the pressed member. In the ultrasonic press-fitting method, the rotary motion is generated in the horn, thereby preventing the posture of the press-fitted component from collapsing, so that the rotary motion can be applied to the press-fitted component. It is possible to prevent collapse of the posture at the time.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the 1st Embodiment of this invention, and is a perspective view which shows the structure of the whole ultrasonic press injection apparatus. It is a figure which shows the 1st Embodiment of this invention and is a side view which shows the structure of the ultrasonic press-fit unit of an ultrasonic press-fit apparatus. It is a figure which shows the 1st Embodiment of this invention, and is III-III sectional drawing of FIG. FIG. 4A is a diagram showing a first embodiment of the present invention, FIG. 4A is a side view showing a configuration of a tip portion of an ultrasonic press-fitting unit of an ultrasonic press-fitting device, and FIG. 4B is FIG. The side view which expands and shows the b part of FIG. 4, (c) is a cc arrow line view of FIG.4 (b). It is a figure which shows the 1st Embodiment of this invention, and is a perspective view which shows the mode of the measurement for demonstrating an effect | action and effect. It is a figure which shows the 1st Embodiment of this invention, and is a characteristic view for demonstrating an effect | action and effect. FIGS. 7A and 7B show a first embodiment of the present invention, FIG. 7A is a bottom view for explaining the operation and effect, and FIG. 7B is a bottom view of another timing for explaining the operation and effect. It is. FIGS. 8A and 8B are views showing a second embodiment of the present invention, FIG. 8A is a side view showing the configuration of the tip of an ultrasonic press-fitting unit of the ultrasonic press-fitting device, and FIG. 8B is FIG. Fig. 8C is a side view showing the portion b of Fig. 8B in an enlarged manner, and Fig. 8C is a view taken along the line cc in Fig. 8B. FIGS. 9A and 9B are views showing a third embodiment of the present invention, FIG. 9A is a side view showing a configuration of a tip portion of an ultrasonic press-fitting unit of an ultrasonic press-fitting device, and FIG. 9B is FIG. The side view which expands and shows the b section of FIG. 9, (c) is a cc arrow directional view of FIG.9 (b). It is a figure which shows the 3rd Embodiment of this invention, and is a perspective view which shows the structure of the front-end | tip part of the ultrasonic press-fit unit of an ultrasonic press-fit apparatus.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the overall configuration of the ultrasonic press-fitting device according to the present embodiment. First, there is a device stand 1. A press machine 3 as a press means is attached to the apparatus base 1. In the case of this embodiment, the press machine 3 is constituted by an electric actuator. That is, the electric motor 5, a ball screw (not shown) connected to the electric motor 5, a ball nut (not shown) that is screwed and disposed on the ball screw and slides by the rotation of the ball screw, and a rod 7 fixed to the ball nut. Etc. The ball screw, ball nut and the like are housed inside the housing 9.

An ultrasonic press-fitting unit 11 is connected to the tip of the rod 7. The ultrasonic press-fitting unit 11 is configured as shown in FIGS. First, there is a connection tool 13 having a substantially hollow cylindrical shape, and an end member 15 is attached and fixed to the upper end of the connection tool 13 in FIGS. 2 and 3 by a plurality of bolts 17. A female screw portion 19 is formed at the center of the end member 15. On the other hand, a male screw portion (not shown) is formed at the tip of the rod 7 already described. The rod 7 and the end member 15 are connected and fixed by screwing the male screw portion into the female screw portion 19.

  A Langevin transducer 21 as an ultrasonic transducer is housed inside the connector 13. A horn 23 is connected to the distal end side of the Langevin vibrator 21 via a connecting bolt 25. The horn 23 is integrally formed with a flange member 27, and the flange member 27 is attached and fixed to the distal end side of the connector 13 by a plurality of bolts 29.

The drive motor 5 of the press machine 3 already described is controlled by a motor control device 31, and the Langevin vibrator 21 is controlled by an ultrasonic press-fitting control device 33. The Langevin transducer 21 is connected to the ultrasonic press-fitting control device 33 via cables 35 and 37. The cables 35 and 37 are installed through a through-hole 39 formed in the connection tool 13, and electrodes 21a and 21b are projected and arranged on the Langevin vibrator 21 side. The cables 35 and 37 are connected to 21b. In the case of the present embodiment, a hole is previously drilled in the work 43 as a press-fitted member conveyed by the belt conveyor 41, and a pin 45 as a press-fitting part is press-fitted into the hole. is there.
At the stage of being conveyed by the belt conveyor 41, the lower end of the pin 45 is slightly inserted into the hole of the work 43.

As shown in FIG. 4, the horn 23 has a substantially inverted conical shape. In addition, a pair of first grooves 51, 51 and a pair of second grooves 53, 53 are formed at the tip. First, the pair of first grooves 51, 51 are provided in a state of being opposed to each other at a position of 180 °. Similarly, the pair of second grooves 53, 53 are also provided in a state of being opposed to each other at a position of 180 °. The pair of second grooves 53 and 53 rotate in the rotation direction with respect to the first grooves 51 and 51 by an arbitrary angle in the range of 60 ° to 120 ° (90 ° in this embodiment). Are provided with their positions shifted. Further, the pair of second grooves 53, 53 have a bending vibration phase difference of 60 ° at a frequency for driving the ultrasonic transducer (Languban transducer 21) with respect to the first grooves 51, 51. It is provided in a state where its axial position is shifted so as to be shifted by an arbitrary angle in the range of ˜120 ° (90 ° in the case of this embodiment).

In the case of the present embodiment, the pair of first grooves 51, 51 and another pair of second grooves 53, 53 are provided, but at different positions along the axial direction. By providing, a plurality of bending vibrations having different resonance frequencies are generated. By devising to bring the bending vibration close to the resonance frequency of the longitudinal vibration of the Langevin vibrator 21, bending vibration having a phase different from the vibration displacement direction is simultaneously generated during the longitudinal vibration excitation, thereby rotating at the tip of the horn 23. Movement will occur. Further, the bending vibration caused by providing the groove at the frequency for driving the ultrasonic transducer can be excited.

Further, in the case of this embodiment, the pair of second grooves 53 and 53 are provided in a state where their positions are shifted in the rotational direction by 90 ° with respect to the first grooves 51 and 51. At the same time, the pair of second grooves 53, 53 are provided with their axial positions shifted so that the phase difference of the bending vibration is shifted by 90 ° with respect to the first grooves 51, 51. Therefore, the rotational motion is a circular orbital rotational motion.
Incidentally, when each angle is set to an angle other than 90 °, for example, a rotational motion of an elliptical orbit is obtained.

The operation will be described based on the above configuration.
First, as a basic operation as an ultrasonic press-fitting device, a pressing force is applied in a direction toward the workpiece 43 by the press machine 3. At the same time, ultrasonic vibration is applied by the ultrasonic press-fitting unit 11, whereby the pin 45 is pressed in a state where ultrasonic vibration is applied, and is pressed into the hole of the work 43. become.

In this case, since the pair of first grooves 51, 51 and another pair of second grooves 53, 53 are formed at the tip of the horn 23 in the case of the present embodiment, the ultrasonic press-fitting is performed. Bending vibration is generated by the longitudinal vibration applied by the unit 11. As a result, the pin 45 rotates about its lower end as a fulcrum so that its upper end performs a circular motion in a horizontal plane. As a result, the pin 45 is accurately press-fitted into the hole of the workpiece 43 without breaking its posture.

With reference to FIG. 5 and FIG. 6, a detailed description will be given of the circular mobility of the upper end of the pin 45. First, as shown in FIG. 5, at the tip of the horn 23, the first groove 51 is irradiated with laser (X direction), and similarly, the second groove 53 is irradiated with laser (Y direction). ) And its rotational motion was measured by a laser vibrometer. As a result, a result as shown in FIG. 6 could be obtained. FIG. 6 is a diagram showing time variation of amplitude with time on the horizontal axis and amplitude on the vertical axis. As shown in FIG. 6, the bending vibration in the X direction and the bending vibration in the Y direction are generated with a phase difference of 90 °. As a result, the pin 45 rotates about its lower end as a fulcrum so that its upper end performs a circular motion in a horizontal plane. This is shown in FIG. FIGS. 7A and 7B are views of the horn 23 as viewed from below, and the state rotated by 90 ° from the state shown in FIG. 7A is the state shown in FIG. 7B.

  When such a circular motion occurs, the upper end of the pin 45 moves toward the center, and as a result, the collapse of the posture of the pin 45 is effectively prevented.

As described above, according to the present embodiment, the following effects can be obtained.
First, since the pair of first grooves 51, 51 and another pair of second grooves 53, 53 are formed at the tip of the horn 23, bending vibration is generated by the longitudinal vibration generated by the ultrasonic press-fitting unit 11. As a result, the upper end of the pin 45 rotates and tries to prevent the posture from collapsing. Thereby, the collapse of the posture of the pin 45 is prevented, and it becomes possible to perform press-fitting with high accuracy.
In the case of the present embodiment, the pair of second grooves 53, 53 are at an arbitrary angle in the range of 60 ° to 120 ° with respect to the first grooves 51, 51 (this embodiment In the case of the form, it is provided with its position shifted in the rotational direction by 90 °), and the pair of second grooves 53, 53 are relative to the first grooves 51, 51. Since the phase difference of the bending vibration is shifted by an arbitrary angle in the range of 60 ° to 120 ° (90 ° in the case of this embodiment), the axial position is shifted, so that the pin The upper end of 45 will perform a circular motion in the horizontal plane with the lower end as a fulcrum, whereby the above effect can be further enhanced.

Next, a second embodiment of the present invention will be described with reference to FIG. In the case of the first embodiment, a pair of first grooves 51, 51 and another pair of second grooves 53, 53 are formed. In the case of this embodiment, one each. The first groove 51 and the second groove 53 are formed.
Other configurations are the same as those in the case of the first embodiment, and the same reference numerals are given to the same portions in the drawing, and the description thereof is omitted.

In the case of this second embodiment, since the center of bending vibration is shifted with respect to the center of the horn 23, the rotational motion is generated at a position shifted with respect to the shaft core. The same effects as those of the first embodiment can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIGS. In the case of the third embodiment, an annular groove 61 is formed at the tip of the horn 23.
In the case of this embodiment, bending vibration is generated by providing the annular groove 61 by the longitudinal vibration generated by the ultrasonic press-fitting unit 11. The annular groove 61 is formed so that the frequency and the resonance frequency of the bending vibration generated by providing the annular groove are close to each other.
The other configurations are the same as those in the first embodiment, and the same parts are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

Even with such a configuration, it is possible to achieve substantially the same effects as those of the first and second embodiments.
Further, since the annular groove 61 is formed so that the resonance frequency of the ultrasonic transducer and the resonance frequency of the bending vibration generated by providing the annular groove are close to each other, the bending vibration is generated in any direction of the ring. The effect which makes it easy to raise is acquired. In addition, if the end of the press-fit pin 45 comes into contact with the tip of the horn 23 in which the annular groove 61 is formed, and the posture of the press-fit pin 45 is tilted at that time, a large bending vibration is generated in the tilt direction. Thereby, the tilt correction effect of the press-fit pin 45 is obtained.

The present invention is not limited to the first to third embodiments.
First, in the case of the first and second embodiments, the configuration in which both the first groove and the second groove are provided has been described as an example. However, in either case, a certain degree of effect is achieved. I can play.
A configuration in which three or more kinds of grooves are provided at three or more locations in the circumferential direction is also conceivable.
In the case of the first and second embodiments, in the configuration in which both the first groove and the second groove are provided, the second groove is 60 ° to the first groove. The case where the angle is set to 90 ° within the range of 120 ° has been described as an example. However, it is conceivable that the position is shifted in the rotation direction at an angle other than 90 °, and the second groove is formed in the second groove. Although the case where the phase difference of the bending vibration is set to 90 ° in the range of 60 ° to 120 ° with respect to one groove has been described as an example, the axial position thereof is shifted so as to be shifted by an angle other than 90 °. It is also possible to provide it in a shifted state. In that case, the upper end of the pin performs an elliptical motion in the horizontal plane with the lower end as a fulcrum.
Further, the position may be set by shifting the position in the rotation direction at an angle other than the range of 60 ° to 120 °, or the bending vibration phase difference may be set at an angle other than the range of 60 ° to 120 °. Anyway.
In addition to the Langevin transducer, various types of ultrasonic transducers are conceivable. For example, it is possible to use a magnetostrictive element.
Moreover, you may make it generate | occur | produce a rotational motion by providing a horn with a spiral or a diagonal groove | channel.
Moreover, in the case of each said embodiment, although the shape of the horn was made into the substantially inverted cone shape, it is not limited to it, For example, the thing of a funnel shape is also assumed.
Moreover, in the case of each said embodiment, although the case where it applied to an ultrasonic press-in apparatus is mentioned as an example and demonstrated, it is not limited to it, It can apply also to the machine of another use. It is.
In addition, the illustrated configuration is merely an example.

The present invention relates to an ultrasonic vibration unit and an ultrasonic wave that uses such an ultrasonic vibration unit and press-fits a pin as a press-fitting part while applying ultrasonic vibration into a hole provided in a work as a press-fit member. The present invention relates to a press-fitting device and an ultrasonic press-fitting method, and in particular, to a device devised so as to prevent the collapse of the posture of a press-fitting component during a press-fitting operation (for example, twisting, tilting, etc.) and accurately press-fitting, for example, This is suitable when the pins are ultrasonically pressed into the holes of the workpiece.

3 Press machine (pressing means)
11 Ultrasonic vibration unit 43 Workpiece (Press-fit member)
45 pins (press-fit parts)
12 Langevin transducer (ultrasonic transducer)
23 Horn 51 First groove 53 Second groove

Claims (6)

Is composed of a linked horn to the ultrasonic transducer and the ultrasonic transducer, the ultrasonic vibration generated by the ultrasonic vibrator in the ultrasonic vibrating unit to output through the horn,
A plurality of first grooves provided at the tip of the horn so as to cut out the tip;
A plurality of second grooves provided to cut out the tip at different positions along the circumferential direction and the axial direction with respect to the plurality of first grooves at the tip of the horn;
Comprising
An ultrasonic vibration unit, wherein the tip of the horn is rotated by bending vibration generated by the plurality of first grooves and bending vibration generated by the plurality of second grooves . The ultrasonic vibration unit according to claim 1,
The ultrasonic vibration unit according to claim 1, wherein a pair of the first groove is opposed and arranged at a position of 180 °, and a pair of the second groove is also arranged and opposed at a position of 180 ° . The ultrasonic vibration unit according to claim 1 or 2,
The ultrasonic vibration unit, wherein the second groove is provided at a position shifted in the circumferential direction within a range of 60 ° to 120 ° with respect to the first groove . In the ultrasonic vibration unit according to any one of claims 1 to 3,
The second groove is positioned with respect to the first groove so that the phase difference between the bending vibration generated by the first groove and the bending vibration generated by the second groove is 60 ° to 120 °. An ultrasonic vibration unit characterized by being shifted in the axial direction . A pressing means provided with a rod to be moved back and forth, and the ultrasonic vibration unit according to any one of claims 1 to 4 attached to a tip of the rod, wherein the rod is moved by the pressing means. An ultrasonic press-fitting device, wherein the press-fitting part is pressed into a hole of a press-fitted member through the ultrasonic vibration unit . A rod that is moved back and forth is provided, and the press-fitting component is pressed through the ultrasonic vibration unit by a pressing means in which the ultrasonic vibration unit according to any one of claims 1 to 4 is attached to a tip of the rod. ultra the press-fitting part so as to press fit within the bore of the press-fitting member, the rotational movement of the tip of the horn of the ultrasonic vibration unit, characterized in that so as to prevent the collapse of the posture of the press-fitting parts by Sonic injection method .

Images