JP2008149441A - Ultrasonic tool holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable ultrasonic processing tool holder having high processing accuracy. <P>SOLUTION: This ultrasonic tool holder 1 is a stainless steel column, and a tip part is the side for holding a tool. A hole coincident with the axis of the column is arranged up to the depth of a half degree of the length of the column on its reverse side. A stainless steel chuck bar 3 coincident with the axis of the ultrasonic tool holder 10 is arranged in a central part of the hole, and a small hole is also arranged at the bottom of the hole, and is joined by an epoxy resin by inserting the chuck bar 3. Cylindrical piezoelectric ceramics 2 being an ultrasonic vibrator are joined to the outside of the column of the ultrasonic tool holder 1 by using the epoxy resin. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ultrasonic tool holder for holding a tool.

  Recently, in order to process a so-called difficult-to-process material, a method of applying ultrasonic vibration to a tool or a workpiece and processing has been frequently used. Such a processing method is called ultrasonic cutting, and is described in detail in Non-Patent Document 1, for example. Examples of tools include a tool used for a lathe and an end mill used for a milling machine. Ultrasonic cutting has the advantages that the frictional resistance between the workpiece and the tool is reduced, so that the thermal distortion of the machined surface is reduced, the machining accuracy is increased, and the life of the cutting tool is extended. .

  Here, the cutting tool shown in Patent Document 1 in FIG. 1 will be described in detail. The cutting tool includes an ultrasonic torsional vibrator that generates ultrasonic torsional vibration, and a flexural vibration body that converts the torsional vibration generated by the ultrasonic torsional vibrator into bending vibration. The ultrasonic torsional vibrator is composed of a bolted Langevin type electrostrictive vibrator and is driven by a high-frequency drive signal from an ultrasonic oscillator.

  The tip of the ultrasonic torsional vibrator is screwed with a magnifying horn that expands the amplitude of the torsional vibration generated from the ultrasonic torsional vibrator and transmits it to the flexural vibrator. The vibration amplitude is expanded several times by passing through the horn.

  Further, a bending vibration body for converting torsional vibration into bending vibration is screwed to the tip of the amplitude expanding horn with a screw (not shown), and a cutting tip is screwed to the tip of the bending vibration body. .

  These ultrasonic torsional vibrators, amplitude-amplifying horns, flexural vibrators, and cutting tips are vibration systems that generate and resonate with standing waves at substantially the same frequency as the natural frequency of ultrasonic torsional vibrators. ing.

  Further, the torsional vibration system is attached to the case by a flange provided at a node of a standing wave generated in the amplitude expanding horn. A fan for cooling the ultrasonic torsional vibrator is provided behind the ultrasonic torsional vibrator.

  Further, when such a cutting tool is attached to a tool post of a lathe and a workpiece is subjected to circumferential cutting, it is preferable to use a vibration-proof alloy tool holder as means for attaching the cutting tool. .

  According to the cutting tool having such a configuration, the vibration generated in the holder during processing is reduced to 1/10 to 1/30 of the conventional, and high-precision and high-efficiency cutting can be performed. It is said that the service life has been improved.

  The ultrasonic grinding apparatus is described in detail in Non-Patent Document 2. The ultrasonic grinding apparatus shown in FIG. 1 also has a motor for rotating a rotary shaft, and a slip ring and an ultrasonic vibrator are provided on the rotary shaft. Further, a booster, a horn, and a diamond grindstone as a grinding tool are connected to the rotating shaft. In addition, a bearing for rotatably supporting is arranged. An ultrasonic oscillator and a brush for applying an ultrasonic alternating voltage to the ultrasonic vibrator are provided.

The general operation method of the above ultrasonic grinding apparatus is as follows. First, when the motor is operated, an ultrasonic alternating voltage is applied from an ultrasonic oscillator to a slip ring that rotates through a brush almost simultaneously. The AC voltage applied to the slip ring is applied to the ultrasonic vibrator, and the ultrasonic vibrator vibrates ultrasonically. This ultrasonic vibration propagates through the booster and horn, and then propagates to the grinding wheel, which is a grinding tool.
Ultrasonic Handbook Editorial Committee, “Ultrasonic Handbook”, Maruzen Co., Ltd., August 1999, p679-684 Japan Electromechanical Industry Association, "Ultrasonic Engineering", Corona Co., Ltd., 1993, p218-229 Japanese Patent Laid-Open No. 7-164217

  However, in the lathe of FIG. 1, there is a risk that the tool post, which is a holding device for holding the tool, and the bite holder, which is a part of the cutting tool, are rubbed with each other due to ultrasonic vibration and seizure occurs.

  In addition, the ultrasonic vibration reduces the frictional force between the tool holder and the tool post, which is the holding device, and the position of the tool holder in the holding device when a mechanical load is applied to the tool holder that is part of the cutting tool during processing. There is also a problem in that the machining accuracy deteriorates due to the change of.

  Further, the ultrasonic vibration of the ultrasonic vibrator propagates to a tool post that is a holding device, and the ultrasonic vibration applied to the cutting tip is reduced. In order to apply an ultrasonic vibration of a desired magnitude to the cutting tip, an unnecessary large ultrasonic AC power is applied to the ultrasonic transducer in order to apply vibration to an unnecessary part such as a tool post as a holding device. For this reason, the ultrasonic vibrator generates extra heat corresponding to the amount of ultrasonic vibration applied to unnecessary portions, and the temperature of the cutting tip, the holding device, etc. rises. This adversely affects machining accuracy, machining efficiency, and cutting chip life.

  As another problem, since the ultrasonic vibrator is bonded to the rear part of the tool holder, the ultrasonic vibration mode that can be excited by the cutting tip is limited. That is, there is a possibility that a desired vibration mode cannot be excited.

In the ultrasonic grinding apparatus of FIG. 2, when an ultrasonic vibrator is attached to the rotating shaft, the rotating shaft vibrates ultrasonically, so that the ultrasonic vibration propagates to the bearing and the bearing may be damaged. Also, abnormal wear may occur on the rotating shaft and the bearing, which may increase wear. Furthermore, since a Langevin type ultrasonic transducer, which is an ultrasonic transducer approximately equal to the diameter of the rotating shaft, is joined to the rotating shaft, the weight increases, the rotational inertia increases, and the structure becomes unsuitable for high speed rotation. Further, the rotation becomes unstable due to the shape error and weight imbalance of the ultrasonic transducer bonded to the rotating shaft, the rotating device breaks down, and the processing accuracy decreases.
Another problem is that the chuck device holding the tool and the tool are rubbed with each other by ultrasonic vibration and seizure occurs.
Furthermore, due to the ultrasonic vibration, the holding force of the chuck device that holds the tool sometimes becomes small, and there is a problem that the tool stops when a mechanical load is applied to the tool during processing.

  In addition, since the tool vibrates with the chuck device as a fixed end, the drive frequency must be changed depending on the length of the tool from the fixed end. However, the Langevin type ultrasonic vibrator, rotating shaft and horn Since the mass is large, vibration can be efficiently excited mainly only at the natural frequency of the Langevin type ultrasonic vibrator. Therefore, there is also a problem that it is impossible to excite vibrations optimal for the tool.

  An object of the present invention is to provide an ultrasonic processing method having high accuracy and high reliability.

  The present invention relates to an ultrasonic tool holder for holding a tool, wherein an ultrasonic vibrator is joined to the ultrasonic tool holder, and the ultrasonic tool holder has a hole that coincides with the center axis of the tool. It has a chuck bar having a central axis coinciding with the central axis of the tool at the center.

  In the present invention, the depth L2 of the hole of the ultrasonic tool holder is 0.2 times or more and 0.8 times or less of the length L1 of the ultrasonic tool holder. Moreover, the diameter of the hole of an ultrasonic tool holder shall be 0.2 times or more and 0.8 times or less of the maximum diameter of an ultrasonic tool holder. Furthermore, the maximum diameter of the chuck bar is 0.2 to 0.8 times the maximum diameter of the hole of the ultrasonic tool holder.

  A device for attaching a tool to the ultrasonic tool holder is provided.

  By using the ultrasonic tool holder of the present invention and performing ultrasonic machining on a machining machine such as a lathe or a milling machine, high-precision and high-speed machining can be performed.

  FIG. 3 is a front view showing a basic configuration of the ultrasonic tool holder 1 of the present invention, and FIG. 4 is a cross-sectional view taken along line AA of FIG. The ultrasonic tool holder 1 is a stainless steel cylinder, and the tip is the side that holds the tool. On the back side, a hole coinciding with the central axis of the cylinder is provided to a depth of about half the length of the cylinder. At the center of the hole, a stainless steel chuck rod 3 coinciding with the central axis of the ultrasonic tool holder 1 is provided at the bottom of the hole, and a smaller hole is provided. The chuck rod 3 is inserted and bonded with epoxy resin. Here, bonding is performed using an epoxy resin, but welding may of course be used. A cylindrical piezoelectric ceramic 2 that is an ultrasonic vibrator is bonded to the outside of the column of the ultrasonic tool holder 1 using an epoxy resin.

  In the configuration of the ultrasonic tool holder 1, the important point is the relationship between the length L1 of the ultrasonic tool holder 1 and the depth L2 of the hole 4 of the ultrasonic tool holder 1. The depth L2 of the hole 4 of the ultrasonic tool holder 1 is desirably in the range of 0.2 to 0.8 times the length L1 of the ultrasonic tool holder 1. The vibration at the center position of the hole 4 of this depth is small and is almost a vibration node. When the chuck bar 3 is joined to the hole 4, an almost ideal vibration node is restrained regardless of the restraining position of the chuck bar 3.

  In the configuration of the ultrasonic tool holder 1, an important point is the relationship between the maximum diameter D1 of the ultrasonic tool holder 1 and the maximum diameter D2 of the hole 4 of the ultrasonic tool holder 1. The maximum diameter D2 of the hole 4 of the ultrasonic tool holder 1 is preferably in the range of 0.2 to 0.8 times the maximum diameter D1 of the ultrasonic tool holder 1. If the maximum diameter D2 of the hole 4 of the ultrasonic tool holder 1 is smaller than 0.2 times the maximum diameter D1 of the ultrasonic tool holder 1, the chuck bar becomes too thin, so that the tool cannot be held with high rigidity. If the maximum diameter D2 of the hole 4 of the ultrasonic tool holder 1 is larger than 0.8 times the maximum diameter D1 of the ultrasonic tool holder, the thickness of the ultrasonic tool holder 1 becomes too thin and excites a desired vibration mode. It becomes difficult to do.

  In the configuration of the ultrasonic tool holder 1, an important point is the relationship between the maximum diameter D2 of the hole 4 of the ultrasonic tool holder 1 and the maximum diameter D3 of the chuck bar 3. The maximum diameter D3 of the chuck bar 3 is desirably in the range of 0.2 to 0.8 times the maximum diameter D2 of the hole 4 of the ultrasonic tool holder 1. If the maximum diameter D3 of the chuck bar 3 is smaller than 0.2 times the maximum diameter D2 of the hole 4 of the ultrasonic tool holder 1, the chuck bar 3 becomes too thin and the tool 5 cannot be held with high rigidity. If the maximum diameter D3 of the chuck bar 3 is larger than 0.8 times the maximum diameter D2 of the hole 4 of the ultrasonic tool holder 1, there is a high possibility that ultrasonic vibration is excited on the chuck bar 3.

  The cylindrical piezoelectric ceramic 2 is polarized in the radial direction. Silver electrodes are provided on the inner and outer surfaces.

  Next, the vibration mode of the ultrasonic tool holder 1 will be described. The ultrasonic tool holder 1 to which the piezoelectric ceramic 2 is bonded performs a primary longitudinal vibration in which both ends are not restrained. Then, the position of the hole bottom of the ultrasonic tool holder 1 is almost a longitudinal vibration node, and the chuck bar 3 is joined to that position. Therefore, even if the chuck bar 3 is held and fixed, the longitudinal vibration of the ultrasonic tool holder 1 is hardly affected.

  Here, a vibration mode in which, for example, an end mill is held in the ultrasonic tool holder 1 of FIG. 4 will be described with reference to FIG. When the section of L3 of the chuck bar 3 is constrained and a voltage having a natural frequency of longitudinal vibration of the ultrasonic tool holder 1 is applied to the piezoelectric ceramic 2, the ultrasonic tool holder 1 is almost affected by the restraint of the chuck bar 3. It vibrates vertically. The end of the ultrasonic tool holder 1 becomes a vibration abdomen, and the end mill connected thereto also vibrates longitudinally.

  FIG. 6 shows the result of calculating the above vibration using the finite element method. In order to simplify the calculation, only 30 degrees was calculated using symmetry conditions. Further, the section L3 of the ultrasonic tool holder 1 of the chuck bar 3 is restrained. The vibration displacement of the ultrasonic tool holder 1 calculated under such conditions is indicated by a vector. The chuck bar 3 hardly vibrates. The ultrasonic tool holder 1 is subjected to primary longitudinal vibration with substantially free ends. However, the central portion of the ultrasonic tool holder is displaced in the radial direction. This is presumably because the rigidity in the radial direction is small due to the influence of the hole 4 of the ultrasonic tool holder 1. The tool 5 corresponding to the end mill also performs substantially primary longitudinal vibration with the tip end surface of the ultrasonic tool holder 1 as a support end.

  As described above, even if the chuck bar 3 is restrained, the longitudinal vibration of the ultrasonic tool holder 1 is hardly attenuated. Moreover, a desired longitudinal vibration can also be excited in the tool 5. Since only the ultrasonic tool holder 1 and the tool 5 are substantially vibrated, unnecessary vibration is not propagated to the mechanical device. Further, since unnecessary vibration is not propagated, vibration energy can be reduced, so that the amount of generated heat can be reduced, and the processing accuracy can be improved. Furthermore, since the power supply can be reduced, the power supply can be reduced, so that the equipment cost can be reduced.

  Here, a lathe operating method using the ultrasonic tool holder of the present invention will be described with reference to FIG. A high frequency voltage is applied to the piezoelectric ceramic 2 from an ultrasonic oscillator (not shown). By applying a high frequency voltage having a desired frequency, stretching vibration is excited in the length direction of the tool 5. At substantially the same time, a motor (not shown) is started to rotate the chuck device 6 and the workpiece 7 mechanically fixed thereby. And the feed motor which is not illustrated is started, the tool 5 with a cutting tip is moved to the workpiece | work 7 direction, and the inner peripheral part of the workpiece | work 7 is cut. A cutting fluid is supplied to the cutting part at the time of cutting.

  Details of the ultrasonic tool holder 1 and the tool will be described with reference to the side view of FIG. A tool having a cutting tip 10 is joined to the ultrasonic tool holder 1 with a bolt (not shown). Then, the chuck bar 3 is fixed by the tool post 9.

  In the above configuration, only the ultrasonic tool holder 1 and the tool 5 vibrate. The vibration hardly propagates to the tool post 9 of the lathe 8. Therefore, since no power is required to excite unnecessary vibrations, the ultrasonic oscillator can be downsized, and since the power input is small, the temperature rise of the cutting tip 10 can be reduced, so that the machining accuracy and the machining speed are high. it can.

  FIG. 9 is a front view including a partial cross section showing a basic configuration of an ultrasonic polishing apparatus using the ultrasonic tool holder 1 of the present invention. A hollow motor 12 for rotating a stainless steel hollow rotating shaft 11 is provided. There is a bearing 13 for rotatably supporting the rotating shaft 11, and there is a stainless case 14 for fixing the bearing 13. The rotary shaft 11 includes a rotary transformer 15 a on the rotation side fixed to the rotary shaft 11. In the vicinity of the rotary transformer 15a, there is a fixed rotary transformer 15b. The fixing plate to which the fixed-side rotary transformer 15b is attached is not shown in order to simplify the drawing. The ultrasonic tool holder 1 is fixed via the chuck bar 3 by the chuck device 6 which is a holding device attached to the rotary shaft 11. The rotary transformer 15 a on the rotation side and the piezoelectric ceramic 2 that is an ultrasonic vibrator fixed to the ultrasonic tool holder 1 are electrically coupled by a lead wire 17. A bar having a grindstone 18 at the tip is joined to the ultrasonic tool holder 1. Below that, there is a work 7 fixed to the table 19.

  Next, the operating method of the processing apparatus using this ultrasonic tool holder 1 will be described with reference to FIG. First, the motor 12 is turned on to rotate the rotating shaft 11. Next, the ultrasonic oscillator 16 is turned on, and an ultrasonic alternating voltage is applied to the cylindrical piezoelectric ceramic 2 via the rotary transformer 15a on the rotating side and the rotary transformer 15b on the fixed side. By applying an ultrasonic AC voltage having a natural frequency at which the ultrasonic tool holder 1 vibrates in the longitudinal vibration mode, only the ultrasonic tool holder 1 and the grindstone 18 with a shaft as the tool 5 mainly vibrate.

  As a result, the chuck device 6 is not seized by ultrasonic vibration, and the ultrasonic tool holder 1 is not loosened due to a decrease in the frictional force of the chuck device 6.

  The above machining is an ultrasonic cutting process, and the frictional resistance between the workpiece 7 and the tool 5 is reduced, so that the thermal distortion of the machining surface is reduced, the machining accuracy is increased, and the life of the tool 5 is extended. It has the advantages such as.

  Of course, vibration hardly propagates to the rotating shaft 11, so there is almost no risk of damage due to vibration of the bearing 13 or the rotating shaft 11.

  As described above, since vibration can be excited only in the tool 5 and the ultrasonic tool holder 1, ultrasonic processing with high processing accuracy and high reliability can be provided.

  As shown in the above two examples, the ultrasonic machining using the ultrasonic tool holder 1 of the present invention can excite the ultrasonic vibration only in the ultrasonic tool holder 1 and the tool 5, so that the machining accuracy is high. It has the advantages of high tool life, increased tool life and increased machining speed.

  Tools used in the present invention include end mills, knives, drills, reamers, and the like, in addition to the above-described tool and grindstone with shaft.

  Another ultrasonic tool holder is shown in FIG. 11 which is a front view of FIG. 10 and a sectional view taken along line AA of FIG. The outer shape of the ultrasonic tool holder 1 made of titanium alloy is a regular quadrangular prism. A rectangular piezoelectric ceramic 2 is bonded to the outer four surfaces by an epoxy resin. The stainless steel chuck rod 3 is attached to the center of the bottom of the hole 4 by brazing.

  The arrow in the figure is the polarization direction of the piezoelectric ceramic 2. Then, the ultrasonic tool holder 1 side is set to the ground side, and sinusoidal and cos phase voltages having the same frequency are applied from the ultrasonic oscillator through lead wires as shown in the figure. As a result, the tool can excite elliptical vibrations in a plane perpendicular to the central axis. Such vibration is suitable, for example, for polishing or lapping a plane.

  A collet device, which is a chuck device 6, is joined to the tip surface of the ultrasonic tool holder 1. The ultrasonic tool holder 1 and the collet container 21 are formed as an integral structure. For example, an end mill is fixed as a tool 5 by a collet 20 via a collet screw 22.

  There is also another ultrasonic tool holder 1 shown in the front view of FIG. 12 and the side view of FIG. The outer shape of the ultrasonic tool holder 1 made of tool steel is a regular hexagonal column. A rectangular piezoelectric ceramic 2 is bonded to the outer six surfaces by an epoxy resin. The tool steel chuck bar 3 is attached to the center of the bottom of the hole 4 by welding.

  A drill chuck device, which is the chuck device 6, is joined to the distal end surface of the ultrasonic tool holder 1 with screws. For example, a drill is fixed as the tool 5 using a drill chuck device.

  The polarization direction of the piezoelectric ceramic 2 is the plate thickness direction. The ultrasonic tool holder 1 side is the ground side, and a voltage is applied from the ultrasonic oscillator through a lead wire. As a result, longitudinal vibration in the central axis direction can be excited in the tool 5. Such vibrations are suitable, for example, for drilling, cutting and grooving.

  12 and 13, the ultrasonic tool holder 1 is made of a stainless steel regular hexagonal column having a maximum diameter D1 of 30 mm, a length L1 of 45 mm, a hole 4 of the ultrasonic tool holder 1 having a maximum diameter D2 of 20 mm, and the length of the hole. The length L2 was 20 mm, the maximum diameter D3 of the chuck bar 3 was 6 mm, and the length of the chuck bar 3 was 60 mm. Next, six piezoelectric ceramics 2 polarized in the thickness direction having a width of 14 mm, a length of 20 mm, and a thickness of 1 mm were joined to the outer surface of the ultrasonic tool holder 1 using an epoxy resin. In addition, the hole 4 of the ultrasonic tool holder 1 was cylindrical, and the chuck bar 3 was a round bar. In addition, a round bar having a diameter of 10 mm and a length of 30 mm was formed integrally with the ultrasonic tool holder 1 at the center of the tip surface of the ultrasonic tool holder 1. This round bar was prepared as an end mill corresponding to the tool 5.

  Next, as a result of applying a voltage of about 35 KHz and 70 V (PP) to the piezoelectric ceramic 2, the amount of axial vibration displacement at the tip surface of the round bar corresponding to the tool 5 having a length of 30 mm is about 5.6 μm ( PP), the amount of vibration displacement in the direction orthogonal to the axis in the vicinity of the end face of the round bar corresponding to the tool 5 was about 0.05 μm (PP).

  It was possible to excite only a longitudinal vibration in a round bar corresponding to the tool 5 with a sufficient magnitude. As described above, the configuration of the present invention was proved to be an unprecedented configuration capable of obtaining the target vibration.

  The outer shape of the ultrasonic tool holder 1 has been described with a cylinder, a regular square column, and a regular hexagonal column. However, in order to obtain a desired vibration mode of the ultrasonic tool holder, a regular polygonal column and a cylinder that are equal to or greater than a regular triangular column are desirable. .

  There is also another ultrasonic tool holder 1 shown in a front view of FIG. 14 and FIG. 15 is a sectional view taken along line AA of FIG. The outer shape of the aluminum alloy ultrasonic tool holder 1 is a cylinder. In this ultrasonic tool holder 1, the chuck bar 3 and the lower ultrasonic tool holder 1a are integrated. The annular piezoelectric ceramics 2a and 2b are tightened and integrated with the upper ultrasonic tool holder 1b and the lower ultrasonic tool holder 1a.

  When the piezoelectric ceramic 2 having the polarization direction indicated by the arrow shown in the perspective view of FIG. 16 is used in the configuration of FIGS. 14 and 15, longitudinal vibration that vibrates in the central axis direction can be excited.

  Further, when a piezoelectric ceramic having a polarization direction indicated by an arrow shown in the perspective view of FIG. 17 is used in the configurations of FIGS. 14 and 15, torsional vibration that vibrates around the central axis can be excited.

  Here, an outline of a method for producing the piezoelectric ceramic 2 for torsional vibration will be described. A ring-shaped piezoelectric ceramic 2 divided into four parts is polarized in the direction of the arrow. And it joins in ring shape with the epoxy resin 23. Further, the both sides of the ring are polished and lapped so as to be flat.

  Thus, by joining the piezoelectric ceramic 2 to the ultrasonic tool holder 1 with a screw, the long-term reliability of the joining can be improved.

  The ultrasonic tool holder of the present invention can be ultrasonically used in various machining apparatuses.

It is a schematic explanatory drawing which shows the conventional ultrasonic byte. It is a schematic explanatory drawing which shows the conventional ultrasonic polishing apparatus. It is a front view which shows the ultrasonic rotation holder of this invention. It is sectional drawing in the AA of FIG. It is sectional drawing which shows the structure which joined the tool to the ultrasonic rotation holder of FIG. It is the figure which calculated the vibration mode by the finite element method about the structure of FIG. It is the front view from the top which used the ultrasonic rotation holder of the present invention for the lathe It is a side view which shows the detail of the ultrasonic rotary holder and tool used for FIG. It is a side view including the partial cross section which used the ultrasonic rotating holder of this invention for the grinding | polishing apparatus. It is a front view which shows another ultrasonic rotary holder of this invention. It is sectional drawing in the AA of FIG. It is a front view which shows another ultrasonic rotating holder of this invention. It is sectional drawing in the AA of FIG. It is a front view which shows another another ultrasonic rotary holder of this invention. It is sectional drawing in the AA line of FIG. It is a perspective view which shows the piezoelectric ceramic used for FIG. It is a perspective view which shows another piezoelectric ceramic used for FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ultrasonic tool holder 2 Piezoelectric ceramic 3 Chuck rod 4 Hole 5 Tool 6 Chuck apparatus 7 Work piece 8 Lathe 9 Tool post 10 Cutting tip 11 Rotating shaft 12 Motor 13 Bearing 14 Case 15 Rotary transformer 16 Ultrasonic oscillator 17 Lead wire 18 Grinding stone 19 Table 20 Collet 21 Collet container 22 Collet screw 23 Epoxy resin

Claims (5)

  In a tool holder for holding a tool, an ultrasonic transducer is joined to the tool holder, and the ultrasonic tool holder has a hole that matches the central axis of the tool, and the central axis of the tool is in the center of the hole. It is characterized by having a chuck bar with a matching central axis.   The tool holder according to claim 1, wherein the depth L2 of the hole of the tool holder is 0.2 to 0.8 times the length L1 of the tool holder.   The tool holder according to claim 1, wherein the diameter of the hole of the tool holder is 0.2 times or more and 0.8 times or less of the maximum diameter of the ultrasonic tool holder.   2. The tool holder according to claim 1, wherein a maximum diameter of the chuck bar is 0.2 to 0.8 times a maximum diameter of the hole of the ultrasonic tool holder.   A device for attaching a tool to the tool holder is provided.

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