WO2020209362A1

WO2020209362A1 - Ultrasonic vibration adding tool

Info

Publication number: WO2020209362A1
Application number: PCT/JP2020/016129
Authority: WO
Inventors: 大西　一正
Original assignee: 有限会社Ｕｗａｖｅ
Priority date: 2019-04-11
Filing date: 2020-04-10
Publication date: 2020-10-15
Also published as: JPWO2020209362A1

Abstract

An ultrasonic vibration adding tool including a ring-shaped balance weight having a threaded part, at the top of an inner circumferential surface, which the threaded part of a cylindrical housing is screwed into. The ultrasonic vibration adding tool has such a structure that, below the threaded part of this ring-shaped balance weight is formed a lower small diameter part the inner diameter of which is smaller than the inner diameter of the threaded part, and a space is formed between the inner circumferential surface of the lower small diameter part and the side face of a columnar front mass, the radius (Hin) of a circle formed by the inner circumferential surface of cylindrical part of the cylindrical housing being larger than the radius (Nin) of a circle formed by the inner circumferential surface of the lower small diameter part of the ring-shaped balance weight, a difference in radius (HN), i.e., Hin-Nin, being 0.01-fold to 1-fold of the radius (Fr) of the columnar front mass at a position in contact with the lower surface of a disc-shaped bulge part (flange).

Description

Ultrasonic vibration imparting tool

The present invention relates to an ultrasonic vibration imparting tool using a Langevin type ultrasonic oscillator.
Background technology

Various types of ultrasonic vibrators using a piezoelectric element as an ultrasonic wave generator are known and are used as ultrasonic vibration imparting tools. As a typical configuration of the ultrasonic oscillator, a Langevin type ultrasonic oscillator composed of a pair of metal blocks and a polarized piezoelectric element fixed between these metal blocks is known. .. Among them, the bolted Langevin type ultrasonic vibrator, which has a structure in which polarized piezoelectric elements are connected by bolts between a pair of metal blocks and tightened and fixed at high pressure, can generate high-energy ultrasonic vibrations. Therefore, its use in ultrasonic processing, which is attached to tools for polishing, cutting, plastic working, abrasive grain processing, etc. of various solid materials, has been studied and is actually used. Furthermore, for various ultrasonic vibrators, ultrasonic cleaning, metal bonding, plastic welding, and ultrasonic waves are performed by transmitting the ultrasonic vibration generated by the ultrasonic vibrator via a vibrating plate or various vibrating means. Applications for ultrasonic processing such as atomization, emulsification / dispersion, and also for underwater acoustic devices (sonar) such as fish finder, ultrasonic flaw detectors, medical echo diagnostic devices, and communication application devices such as flow meters. It has been considered and is actually in use.

Patent Document 1 is written on August 16, 2018, which is earlier than the filing date (April 11, 2019) of the Japanese patent application (JP2019-087885) in which the priority based on the Paris Convention is claimed in this patent application. The published PCT / JP2018 / 00428 international publication WO 2018/147445 A1 is shown in Patent Document 1 as FIG. 1 (prior art: PRIOR ART) in the attached drawings of the present application (FIG. 4). A cylindrical housing with a contact surface at the bottom or bottom of the inner peripheral surface and a threaded portion at the bottom of the outer peripheral surface; a disk with a contact surface that is fitted to the contact surface of the cylindrical housing. A configuration in which a polarized piezoelectric element is sandwiched between a front mass including a cylindrical tool fixture having a bulging portion (flange) at the top and a rear mass arranged above the front mass, and bolted. The invention of an ultrasonic vibration imparting tool including a ring-shaped balancing weight (ring-shaped vibration weight) having a screw portion on which the screw portion of the cylindrical housing is screwed is disclosed. Has been done.

Further, in Patent Document 1, as a preferable configuration of the ring-shaped balancing weight, a lower small diameter portion having an inner diameter smaller than the inner diameter of the threaded portion is formed on the lower side of the threaded portion, and the lower small diameter portion thereof is formed. A configuration in which a gap is formed between the inner peripheral surface of the portion and the side surface of the cylindrical tool attachment (which also serves as the front mass) is also disclosed. Then, in FIGS. 4 and 8 and 9, the ultrasonic vibration imparting tool is supported (or held) by a supporting (or holding) member provided around or above the cylindrical housing. It is shown.

Patent Document 1 states that when ultrasonic processing is performed using an ultrasonic processing apparatus incorporating the ultrasonic vibration imparting tool of the invention disclosed therein, the ultrasonic vibration energy generated by the ultrasonic vibration imparting tool is supported. Leakage to the member is significantly reduced, and therefore, the ultrasonic vibration generated by the Langevin type ultrasonic vibrator can be transmitted to the tool attached to the ultrasonic vibration imparting tool with high efficiency and high stability. There is a statement to the effect that it will be possible.

Patent Document 1: WO 2018/147445 A1 (International Publication of PCT / JP2018 / 00428)

The inventor of the present invention is the inventor of the invention disclosed in Patent Document 1, but in order to further improve the ultrasonic vibration imparting efficiency of the ultrasonic vibration imparting tool disclosed in Patent Document 1, Patent Document Improvement of the ultrasonic vibration imparting tool according to No. 1 (in particular, ultrasonic vibration imparting capable of transmitting ultrasonic vibration generated by a Langevin type ultrasonic vibrator to a tool or the like mounted on the front mass with higher efficiency. Since then, I have continued research aimed at (development of tools).
Means to solve problems

As a result of the above research, the inventor of the present invention considers the ultrasonic vibration imparting tool having the basic configuration described in Patent Document 1 as the ultrasonic vibration imparting tool when the configuration satisfies the conditions described below. The present invention has been reached by finding that the function of the above is further improved and the ultrasonic vibration imparting tool is more advantageous for industrial use.

The ultrasonic vibration imparting tool provided by the present invention is an ultrasonic vibration imparting tool having the following configuration.
A cylindrical housing with a contact surface at the bottom or bottom of the inner peripheral surface and a thread at the bottom of the outer peripheral surface; a disc-shaped bulge (flange) with a contact surface fitted to the contact surface of the cylindrical housing. ) Is held at the top, and a cylindrical front mass on which a tool is mounted at the bottom and a cylindrical rear mass placed above the front mass are bolted together with a polarized piezoelectric element sandwiched between them. Langeban type ultrasonic transducer; and an ultrasonic vibration imparting tool including a ring-shaped balancing weight having a threaded portion on the upper part of the inner peripheral surface into which the threaded portion of the cylindrical housing is screwed, of the ring-shaped balancing weight. A small diameter portion (lower small diameter portion) having an inner diameter smaller than the inner diameter of the screw portion is formed on the lower side of the threaded portion, and between the inner peripheral surface of the lower small diameter portion and the side surface of the cylindrical front mass. The radius (Hin) of the circle formed by the inner peripheral surface of the cylindrical part of the cylindrical housing is the radius of the circle formed by the inner peripheral surface of the lower small diameter part of the ring-shaped equilibrium weight (Hin). The radius (Fr) of the cylindrical front mass at the position where (HN), which is larger than Nin) and is the difference from the radius (that is, Hin-Nin), is in contact with the lower surface of the disk-shaped bulge (flange). ) Is 0.01 times or more and 1 time or less.

A preferred embodiment of the ultrasonic vibration imparting tool of the present invention is described below.
(1) The cylindrical housing is made of a metal material (particularly a steel material).
(2) The ultrasonic vibration imparting tool is supported (or held) by a supporting (or holding) member provided around or above the cylindrical housing.
(3) Three or more through holes penetrating from the outer peripheral surface to the inner peripheral surface are formed in the threaded portion (upper large diameter portion) of the ring-shaped balancing weight.
(4) A tool mounting opening is formed below the front mass.

When the ultrasonic vibration imparting tool of the present invention is incorporated into an ultrasonic processing device or an ultrasonic transmission device via a support to generate ultrasonic vibration, the ultrasonic vibration generated by the Langevin type ultrasonic vibrator is supported. There is little leakage to the body, and it can be reliably and highly efficiently transmitted to the tools and vibrating bodies attached to the front mass. Therefore, it is possible to reduce the electric power energy required to drive the ultrasonic vibration device.

It is a front sectional view (vibration mode is also shown) which shows the structural example of the ultrasonic vibration imparting tool (the ultrasonic vibration imparting tool disclosed in Patent Document 1) belonging to the prior art (PRIOR ART). It is a top view of the example of the ultrasonic vibration imparting tool of this invention, and shows the state supported by the support member. It is a front sectional view of the ultrasonic vibration imparting tool (supported by a support member) shown in FIG. Vibration of the Langevin type ultrasonic oscillator generated when electric energy is applied to the ultrasonic vibration imparting device of the present invention shown in FIGS. 2 and 3, vibration of the flange portion of the front mass, and ring-shaped balanced weight. It is explanatory drawing which illustrates each of the vibrations. Note that in FIG. 4, the support member is not shown. Then, FIG. 4 shows a state in which the Langevin type ultrasonic oscillator is in a lowered position due to vibration. The vibration of the Langevin type ultrasonic oscillator constituting the ultrasonic vibration imparting tool of the present invention shown in FIG. 4, the vibration of the disk-shaped bulge (flange) of the columnar front mass, and the vibration of the ring-shaped equilibrium weight, respectively. It is explanatory drawing which shows by a method different from FIG. It is a figure which shows the ring-shaped balancing weight which has the female screw hole for adjusting the runout accuracy which is a preferable example of the ring-shaped balancing weight attached to the ultrasonic vibration imparting tool of this invention, (a) is a plan view, and (b). ) Is a front sectional view cut along the line AA shown in (a). Vibration and columnar of Langevin type ultrasonic vibrator generated when electric energy is applied to an ultrasonic processing device in which a tool is attached to the tip of the front mass of the ultrasonic vibration imparting tool shown in FIG. 2 via a horn. It is explanatory drawing which illustrates the vibration of the disk-shaped bulge (flange) of the front mass, and the ring-shaped equilibrium weight, and this figure shows a state where the front mass is in a position lowered by the vibration. In the configuration of this figure, vibration nodes (nodes) appear on both the horn and the rear mass.

A detailed description of the ultrasonic vibration imparting device of the present invention will be described with reference to FIGS. 2 to 7.

2 and 3 are views showing a typical configuration example of the ultrasonic vibration imparting tool of the present invention, in which the ultrasonic vibration imparting tool supports (or holds) the ultrasonic vibration imparting tool provided around or above the cylindrical housing. Indicates a state of being supported (or held) by a member.

The ultrasonic vibration imparting tool of the present invention shown in FIGS. 2 and 3 has a configuration similar to that of the ultrasonic vibration imparting tool disclosed in Patent Document 1.

That is, the ultrasonic vibration imparting tool 1 shown in FIGS. 2 and 3 is provided with a contact surface (contact surface with the end surface of the flange 3 formed on the upper portion of the front mass 2) at the lower portion or the bottom portion of the inner peripheral surface. Cylindrical housing 9 with a threaded portion at the bottom of the outer peripheral surface; a flange 3 (disk-shaped bulge) with a contact surface fitted to the contact surface of the cylindrical housing 9 at the top 18 and a tool at the bottom. The polarization-treated

piezoelectric elements

4a and 4b are sandwiched between the cylindrical front mass 2 on which the is mounted and the cylindrical rear mass 7 arranged above the front mass 2 by the

electrodes

6a and 6b, and the bolts 8 are used. A flange van type ultrasonic transducer 1 having a fixed configuration; and an ultrasonic vibration imparting tool including a ring-shaped balancing weight 5 having a threaded portion on the lower outer peripheral surface of the cylindrical housing 9 on the upper inner peripheral surface, which is a ring. A lower small diameter portion having an inner diameter smaller than the inner diameter of the threaded portion is formed on the lower side of the threaded portion of the balanced weight 5, and the inner peripheral surface of the lower small diameter portion and the side surface of the cylindrical front mass 2 are formed. A circle having a structure in which a gap is formed between them, and the radius (Hin) of the circle formed by the inner peripheral surface of the cylindrical portion of the cylindrical housing 9 is a ring-shaped equilibrium weight 5 formed by the inner peripheral surface of the lower small diameter portion. The radius (Fr) of the cylindrical front mass 2 at the position where (HN), which is larger than the radius (Nin) of the flange 3 and is the difference from the radius (that is, Hin-Nin), is in contact with the lower surface of the flange 3 is 0. It is an ultrasonic vibration imparting tool 1 which is 0.01 times or more and 1 times or less. Note that FIGS. 2 and 3 show a state in which the ultrasonic vibration imparting tool 1 is supported (or held) by a supporting (or holding) member 15 provided around or above the cylindrical housing 9.

That is, the ultrasonic vibration imparting tool of the present invention is an ultrasonic vibration imparting tool described in Patent Document 1 and having a basic configuration similar to that of the illustrated ultrasonic vibration imparting tool, but the cylindrical portion of the cylindrical housing. The radius (Hin) of the circle formed by the inner peripheral surface is larger than the radius (Nin) of the circle formed by the inner peripheral surface of the lower small diameter portion of the ring-shaped equilibrium weight, and the difference from the radius (that is, Hin-Nin). ) Is 0.01 times or more and 1 time or less of the radius (Fr) of the columnar front mass at the position in contact with the lower surface of the disk-shaped bulge (flange).

As described above, the ultrasonic vibration imparting tool of the present invention has a basic configuration similar to that of the ultrasonic vibration imparting tool described in Patent Document 1 and shown, but within the cylindrical portion of the cylindrical housing. The radius (Hin) of the circle formed by the peripheral surface is larger than the radius (Nin) of the circle formed by the inner peripheral surface of the lower small diameter portion of the ring-shaped equilibrium weight, and is the difference (Hin-Nin) from the radius. The difference is that (HN) is 0.01 times or more and 1 time or less of the radius (Fr) of the cylindrical front mass at the position in contact with the lower surface of the disk-shaped bulge (flange).
Due to such a difference in configuration, the lower small diameter portion of the ring-shaped balancing weight that contacts the lower surface of the disk-shaped bulging portion (flange) is compared with the ultrasonic vibration imparting tool described in Patent Document 1. The contact area of the upper surface becomes large. Therefore, the ultrasonic vibration generated by the Langevin type ultrasonic oscillator and transmitted to the flange can be transmitted to the ring-shaped balanced weight with higher efficiency.

4 and 5 are diagrams diagrammatically showing the transmission of the ultrasonic vibration transmitted to the flange to the ring-shaped balanced weight with high efficiency, respectively.
That is, the vertical vibration (butterfly vibration) of the outer peripheral end of the ring-shaped balancing weight becomes large. Then, due to the vertical vibration (butterfly vibration) increased at the outer peripheral end portion, the bending vibration of the flange of the front mass in the vertical direction increases from the screw surface of the upper large diameter portion through the lower part of the housing, and as a result, The ultrasonic vibration in the vertical direction of the front mass increases. That is, the ultrasonic vibration in the vertical direction generated by the Langevin type ultrasonic vibrator is amplified and transmitted to the tool or the vibrating tool equipped with the front mass.

It should be noted that, as a matter of course, the piezoelectric element mounted on the Langevin type ultrasonic oscillator of the ultrasonic vibration imparting tool shown in each drawing attached to the present application actually supplies electric energy. Comes with a wiring system for. However, the illustration of such a wiring system is omitted in each drawing because the drawing becomes complicated.

(A) and (b) of FIG. 6 show preferable shapes of the ring-shaped balancing weight attached to the ultrasonic vibration imparting tool of the present invention, respectively.
That is, in the ultrasonic vibration imparting tool, the central axis of the ultrasonic vibrator is slightly deviated due to a slight "shift" in the mounting position of the ring-shaped balancing weight that occurs during assembly or continuous use. However, the deviation of the central axis of such an ultrasonic vibration imparting tool may adversely affect the performance of the ultrasonic vibration imparting tool. In order to prevent or correct the deviation (bias) of the central axis of such an ultrasonic oscillator, it may be required to correct the deviation of the central axis. Then, in preparation for such a requirement, it is preferable to provide a female screw hole for adjusting the runout accuracy in the large diameter portion on the upper side of the ring-shaped balancing weight 5. The plan view and the vertical front view of the shape of the ring-shaped balancing weight 5 provided with the female screw hole for adjusting the runout accuracy are shown in FIGS. 6A and 6B. As shown in FIG. 6 (a), it is desirable to form three or more female screw holes for adjusting the runout accuracy evenly along the plane of the ring-shaped balancing weight. When adjusting the runout accuracy, the deviation of the central axis of the ultrasonic vibration imparting tool can be adjusted by embedding a male screw in each female screw hole and adjusting the tip position of the male screw.

FIG. 7 shows an image of an ultrasonic processing tool in which a tool is attached to the front mass of the ultrasonic vibration imparting tool of the present invention via a horn.
That is, the ultrasonic processing tool shown in FIG. 7 has a configuration in which a tool is attached to the ultrasonic vibration imparting tool shown in FIGS. 2 to 5 via a horn, but even in this case, the vibration Although the number of nodes increases, ultrasonic vibration in a mode similar to the ultrasonic vibration shown in FIGS. 4 and 5 is generated.

Claims

Cylindrical housing with contact surfaces at the bottom or bottom of the inner peripheral surface and threads at the bottom of the outer peripheral surface; having a flange at the top with a contact surface fitted to the contact surface of the cylindrical housing. A flange van type ultrasonic transducer with a structure in which a polarized piezoelectric element is sandwiched between a cylindrical front mass on which a tool is mounted at the bottom and a cylindrical rear mass placed above the front mass and bolted. An ultrasonic vibration imparting tool including a ring-shaped balancing weight having a screw portion on the upper part of the inner peripheral surface into which the screw portion of the cylindrical housing is screwed, and below the threaded portion of the ring-shaped balancing weight. A lower small diameter portion having an inner diameter smaller than the inner diameter of the threaded portion is formed, and a gap is formed between the inner peripheral surface of the lower small diameter portion and the side surface of the cylindrical front mass, and the cylinder is cylindrical. The radius (Hin) of the circle formed by the inner peripheral surface of the cylindrical part of the cylindrical housing is larger than the radius (Nin) of the circle formed by the inner peripheral surface of the lower small diameter part of the ring-shaped balancing weight, and the difference from that radius. (HN) is 0.01 times or more and 1 times or less of the radius (Fr) of the cylindrical front mass at the position in contact with the lower surface of the flange.
The ultrasonic vibration imparting tool according to claim 1, wherein the cylindrical housing is made of a steel material.
The ultrasonic vibration imparting tool according to claim 1, which is supported or held by a support member or a holding member provided around or above the cylindrical housing.
The ultrasonic vibration imparting tool according to claim 1, wherein the threaded portion of the ring-shaped balancing weight is formed with three or more through holes penetrating from the outer peripheral surface to the inner peripheral surface thereof.
The ultrasonic vibration imparting tool according to claim 1, wherein an opening for mounting a tool is formed below the front mass.