Ultrasonic holder

Abstract

This invention provides an ultrasonic holder that integrates an ultrasonic oscillator and a power supply. [Solution] An ultrasonic holder A is attached to the rotating spindle of a machine tool and is a holder for gripping a tool 6, and is equipped with the function of applying ultrasonic vibrations to the tool 6. The ultrasonic holder A comprises a housing 1 and a spindle 2, part of which is housed in the housing 1 and the other part which protrudes from the housing 1. The housing 1 has a control device 4 for controlling the ultrasonic holder A and a battery 5 for supplying power to a piezoelectric element 21. The spindle 2 has a piezoelectric element 21 that vibrates ultrasonically when power is supplied and a resonator 22 connected to the piezoelectric element 21 that amplifies the vibration of the piezoelectric element 21.

Description

Technical Field

[0001] This invention relates to a holder that can be attached to the rotating spindle of a machine tool such as a machining center, and is an ultrasonic holder capable of ultrasonically vibrating a tool.

Background Art

[0002] In fields such as die processing, high-speed milling and high-speed grinding methods are used. For example, roughing to finishing can be performed using a single tool.

[0003] As an apparatus for performing such high-speed milling, for example, as Patent Document 1, a configuration related to a spindle device is disclosed that can reduce the manufacturing process of a rotating spindle that rotates while ultrasonically vibrating, can be assembled at low cost, simply and with high precision, has good rotational balance, and can achieve high speed and high precision.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the spindle device according to this Patent Document 1 uses the power received from an ultrasonic oscillator connected by a power supply line to ultrasonically vibrate and rotate the spindle related to the spindle device for cutting.

[0006] Furthermore, when using the spindle device described in Patent Document 1 connected to a machining center (machine tool), it was inconvenient because space had to be considered for the installation of the ultrasonic oscillator, which is separate from the spindle device. In addition, separate installation work was required for the power supply to power the ultrasonic oscillator, and since the ultrasonic oscillator requires a high voltage such as 100V or 200V, a power supply capable of outputting such a high voltage was required, which was also inconvenient.

[0007] Therefore, this invention has been made in view of these points, and aims to provide an ultrasonic holder that integrates an ultrasonic oscillator and a power supply. [Means for solving the problem]

[0008] In order to solve the aforementioned problems and achieve the objective, this invention is configured as follows.

[0009] The invention described in claim 1 is, An ultrasonic holder that is attached to the rotating spindle of a machine tool and is used to grip a tool, and is also equipped with the function of applying ultrasonic vibrations to the tool, The ultrasonic holder comprises a housing and a main shaft, part of which is housed within the housing and the other part of which protrudes from the housing. The housing includes a control device for controlling the ultrasonic holder and a battery for supplying power to the piezoelectric element. The main shaft is an ultrasonic holder having a piezoelectric element that vibrates ultrasonically when power is supplied, and a resonator connected to the piezoelectric element that amplifies the vibration of the piezoelectric element.

[0010] Furthermore, the invention described in claim 2 is, An ultrasonic holder that is attached to the rotating spindle of a machine tool and is used to grip a tool, and is also equipped with the function of applying ultrasonic vibrations to the tool, The ultrasonic holder comprises a housing and a main shaft, part of which is housed within the housing and the other part of which protrudes from the housing. The housing includes a control device for controlling the ultrasonic holder and a generator for supplying power to the piezoelectric element. The main shaft is an ultrasonic holder having a piezoelectric element that vibrates ultrasonically when power is supplied, and a resonator connected to the piezoelectric element that amplifies the vibration of the piezoelectric element.

[0011] Furthermore, the invention described in claim 3 is, The ultrasonic holder according to claim 1 or 2, wherein the control device boosts the DC voltage related to the power supplied from the battery or the generator, converts the boosted DC voltage into an AC voltage, and outputs the converted AC voltage to the piezoelectric element.

[0012] Furthermore, the invention described in claim 4 is, The control device further includes a rotation sensor for detecting the rotation of the main spindle, The control device generates ultrasonic vibrations when it recognizes through the rotation sensor that the rotation of the main spindle exceeds a predetermined number, and stops the ultrasonic vibrations when it recognizes that the rotation of the main spindle falls below the predetermined number, thus providing an ultrasonic holder according to claim 1 or 2.

[0013] Furthermore, the invention described in claim 5 is, The ultrasonic holder according to claim 1, wherein the battery can be charged externally by wired or wireless connection while it is built into the housing. [Effects of the Invention]

[0014] With the above configuration, this invention has the following effects.

[0015] In the inventions described in claims 1 and 2, the ultrasonic holder, ultrasonic oscillator, and power supply are integrated into one unit. Therefore, only the ultrasonic holder needs to be attached to the rotating spindle of a machining center (machine tool), making it easier to attach an ultrasonically vibrating ultrasonic holder regardless of the configuration of the machining center.

[0016] In the invention according to claim 3, since the control device is configured to boost the DC voltage applied from the battery or the generator and convert the boosted DC voltage into an AC voltage, the battery or the generator can be used as a power source for oscillating ultrasonic waves, and the ultrasonic holder, the ultrasonic oscillator, and the power source can be integrated.

[0017] In the invention according to claim 4, when the control device recognizes through the rotation sensor that the rotation of the main shaft has exceeded a predetermined number, the control device generates ultrasonic vibration, and when it recognizes that the rotation of the main shaft has become less than or equal to the predetermined number, the control device stops the ultrasonic vibration. With this configuration, the ON / OFF of the ultrasonic vibration is automatically performed according to the rotation speed of the main shaft related to the ultrasonic holder, which is convenient. In addition, power waste can be reduced and power saving can be achieved. Further, when the power source is a battery, the battery power can be extended in life, which is convenient.

[0018] In the invention according to claim 5, since it can be charged from the outside without removing the battery built in the housing, there is no need to remove the ultrasonic holder from the machining center for battery replacement, which is convenient.

Brief Description of the Drawings

[0019] [Figure 1] It is a left side view of the ultrasonic holder according to the first embodiment. [Figure 2] It is a cross-sectional view of the ultrasonic holder according to the first embodiment. [Figure 3] It is a right side view of the ultrasonic holder according to the first embodiment. [Figure 4] It is a diagram conceptually showing the overall configuration of the control means related to the ultrasonic holder according to the first embodiment. [Figure 5] It is a diagram conceptually showing the overall configuration of the control device related to the ultrasonic holder according to the first embodiment. [Figure 6] It is a left side view of the ultrasonic holder according to another embodiment. [Figure 7]This diagram conceptually shows the overall configuration of a control device for an ultrasonic holder according to another embodiment. [Modes for carrying out the invention]

[0020] The following describes embodiments of the ultrasonic holder of this invention. These embodiments represent the most preferred form of the invention, and the invention is not limited thereto.

[0021] <First Embodiment> As shown in Figures 1-3, the ultrasonic holder A comprises a housing 1 and a spindle 2 that vibrates ultrasonically. The spindle 2 and the tool 6 attached to the spindle 2 vibrate ultrasonically to cut the workpiece (not shown). Figure 2 is a cross-sectional view of the ultrasonic holder A cut perpendicularly across the BB plane in Figure 1.

[0022] The material of the workpiece can be any material, including carbon steel, pre-hardened steel, stainless steel, hardened steel for molds, non-ferrous metals such as aluminum, as well as non-metallic materials such as glass, ceramics, and gemstones, rubber, plastics, and wood.

[0023] The housing 1 is cylindrical and made of a material such as metal. A portion of the spindle 2 is housed inside the housing 1, while the remaining portion of the spindle 2 protrudes from the housing 1. More specifically, the spindle 2 is housed inside the housing 1 such that a resonator 22 (described later) protrudes from one end of the housing 1 in the thrust direction (axial direction). The housing 1 also mainly houses a control device 4 that controls the ultrasonic holder A and a battery 5 that supplies voltage to the piezoelectric element 21 (described later).

[0024] Six batteries 5 are provided at approximately equal intervals along the inner circumference of the housing 1 (only two are shown in Figure 2 for illustrative purposes). For example, six batteries 5 are connected in series to output a voltage of 20V. Because multiple batteries 5 are provided at approximately equal intervals along the inner circumference of the housing 1, the weight of the batteries 5 is distributed approximately evenly in the radial direction of the ultrasonic holder A, preventing any adverse effects on rotation, such as disrupting the rotational balance, when the ultrasonic holder A rotates. Furthermore, it is desirable to use lithium iron phosphate batteries for the batteries 5, as lithium iron phosphate batteries have a lower risk of explosion due to leakage. The batteries 5 are connected to the control means 41 for mutual communication and supply power to the DC-DC converter 42 in response to commands from the control means 41. The batteries 5 also output information about the remaining power stored within them to the control means 41 as needed. This remaining power information includes, for example, information related to the output current and output voltage of the batteries 5.

[0025] Furthermore, it is desirable that the battery 5 can be charged externally via wired (or wireless) connection while remaining built into the housing 1, without having to remove it from the housing 1. Using a battery 5 with such a configuration would allow it to be charged externally without having to remove it from the housing 1, thus eliminating the need to remove the ultrasonic holder A from the machining center for battery replacement, which is convenient.

[0026] The main shaft 2 is formed from a single component, and its material is, for example, bearing steel, stainless steel, or titanium alloy. This main shaft 2 is cylindrical, and its outer circumference is polished.

[0027] The spindle 2 includes a ceramic piezoelectric element (piazo element) 21 that causes the spindle 2 to vibrate ultrasonically, a resonant body (horn) 22 that resonates in response to the vibration of the piezoelectric element 21, and a tool chuck 23 that is installed in a fixing hole 221 provided at one end of the resonant body 22 in the thrust direction (axial direction) and grips and fixes the tool 6. In the ultrasonic holder A according to this embodiment example 1, a collet chuck is used as the tool chuck 23. As shown in Figure 2, the piezoelectric element 21 is fitted into the other end of the resonant body 22 in the thrust direction and is integrated with the resonant body 22. An electrode (not shown) is connected to the piezoelectric element 21, and the piezoelectric element 21 vibrates when a voltage related to the power supplied from the battery 5 is applied to this electrode.

[0028] Tool 6 can be an end mill or the like, but the material should preferably be cemented carbide, coated cemented carbide, sintered and single-crystal diamond, cBN (cubic boron nitride), or grinding wheel.

[0029] An arbor 3 is connected to the other end of housing 1 in the thrust direction (axial direction). Arbor 3 acts as an adapter connecting the rotary spindle of the machining center to the ultrasonic holder A. Since arbor 3 can be selected to match the specifications of the rotary spindle of the machining center, it can be installed (inserted) into any machining center. Because the ultrasonic holder A is connected to the rotary spindle of the machining center via arbor 3, it rotates in accordance with the rotation of the rotary spindle of the machining center.

[0030] The control device 4 plays the role of controlling the ultrasonic holder A. As shown in Figures 4 and 5, the control device 4 is equipped with a control means 41 which is a microcontroller (microcomputer). It is desirable that the control means 41 be a single-chip microcontroller (=single integrated circuit) that has a rich array of peripheral circuits, including at least a chip control unit 411 such as a CPU (Central Processing Unit), a chip storage unit 412 such as a ROM (Read Only Memory), flash memory or RAM (Random Access Memory), an I / O port (Input / Output Port) 413, a timer 414, a serial communication interface 415, an analog-to-digital converter (AD converter) 416, and a digital-to-analog converter (DA converter) 417, all contained within a single IC (Integrated Circuit).

[0031] Furthermore, as shown in Figure 5, the control device 4 is electrically connected to the battery 5 and includes a DC-DC converter 42 that boosts / decompresses the DC voltage input from the battery 5 and outputs the transformed DC voltage. The DC-DC converter 42 is also connected to the control means 41 in a manner that allows for mutual communication. For example, in response to a command from the control means 41, the DC-DC converter 42 boosts the 10-20V DC voltage input from the battery 5 to a DC voltage of 20-60V and outputs it.

[0032] Furthermore, the control device 4 is electrically connected to the DC-DC converter 42 and includes a high-voltage driver IC 43 that converts the transformed DC voltage input from the DC-DC converter 42 into an AC voltage, changes the frequency if necessary, and outputs an AC voltage with a predetermined frequency (e.g., 40 kHz). This high-voltage driver IC 43 functions as both an inverter and a transformer. The high-voltage driver IC 43 is also connected to the control means 41 in a manner that allows for mutual communication. For example, in response to a command from the control means 41, the high-voltage driver IC 43 converts the 20-60V DC voltage input from the DC-DC converter 42 into an AC voltage, increases the frequency, and outputs an AC voltage with a frequency of 40 kHz. This high-voltage driver IC 43 is electrically connected to the piezoelectric element 21 via electrodes (not shown), and the AC voltage output from the high-voltage driver IC 43 is applied to the electrodes connected to the piezoelectric element 21.

[0033] Furthermore, the control device 4 is equipped with an acceleration sensor 44 (an example of a rotation sensor) that detects and outputs the acceleration of an object by outputting a voltage proportional to the acceleration when it moves in any of the three directions, the X-axis (centrifugal force direction), the Y-axis (circumferential direction), and the Z-axis (earth axis direction), or when gravity is applied. Because this acceleration sensor 44 is provided on the ultrasonic holder A, the acceleration sensor 44 detects whether or not the main shaft 2 related to the ultrasonic holder A is rotating. The acceleration sensor 44 is also connected to the control means 41 so as to be able to communicate with each other. Therefore, when the control means 41 recognizes through the acceleration sensor 44 that the rotation of the main shaft 2 related to the ultrasonic holder A has exceeded a predetermined number (for example, 1000 rpm), it outputs a command to the battery 5 to start supplying power to the piezoelectric element 21, and when it recognizes that the rotation of the main shaft 2 has fallen below the predetermined number, it instructs the battery 5 to stop outputting voltage (supplying power) to the piezoelectric element 21. Here, the commands output for when the rotation of the main spindle 2 related to the ultrasonic holder A "exceeds a predetermined number" and "is below a predetermined number" are distinguished, but this is for the sake of explanation. Therefore, for example, it would also be possible to configure the system to distinguish the commands output for when the rotation is "greater than a predetermined number" and "less than a predetermined number". In short, any configuration that uses a "predetermined number" or a "predetermined range (for example, 1000 to 1200 rpm)" as a boundary for outputting a command to start supplying power to the piezoelectric element 21, or a command to stop outputting voltage (supplying power) to the piezoelectric element 21, is acceptable.

[0034] Furthermore, the control device 4 is equipped with an optical communication IC 45 that inputs and outputs information to and from the outside using infrared light. The optical communication IC 45 is connected to the control means 41 so as to be able to communicate with each other, and the control means 41 outputs to the outside in infrared light the remaining power information such as current and voltage output from the battery 5, and monitoring information related to the operating state of the ultrasonic holder A, such as the amount of rotation of the spindle 2 of the ultrasonic holder A. The control means 41 also receives setting information (operation commands) related to the ultrasonic holder A, such as current and voltage output from the battery 5, in infrared light via the optical communication IC 45, and outputs operation commands to the DCDC converter 42, high-voltage driver IC 43, etc., based on the input setting information.Therefore, for example, an information processing device such as a notebook computer capable of optical communication can receive the monitoring information and obtain operation information related to the ultrasonic holder A from the outside, and can also output setting information to the ultrasonic holder A from the outside using the information processing device.Note that in this embodiment example 1, a configuration using an optical communication IC 45 that performs optical wireless communication using infrared light is shown, but the configuration is not limited to this. For example, any configuration using an optical communication IC that performs optical wireless communication using electromagnetic waves (light rays) with wavelengths between infrared and visible light would suffice.

[0035] Furthermore, the control device 4 includes a battery level monitor indicator 46, which for example has a light-emitting diode (LED). The battery level monitor indicator 46 is connected to the control means 41 so as to be able to communicate with each other, and the battery level monitor indicator 46 displays the remaining charge of the battery 5 in response to a command from the control means 41. For example, if the remaining power of the battery 5 is above a predetermined value, it displays "green," and if it is below the predetermined value, it displays "red." The battery level monitor indicator 46 is located in a position where it can be seen from outside the ultrasonic holder A, for example, on the outside of the housing 1.

[0036] In the control device 4, a single integrated circuit constituting the control device 4 is provided on multiple circular substrates 47, with each circular substrate 47 arranged concentrically with the main axis 2. In Figure 2, the back surfaces of each circular substrate are connected, and the single integrated circuit constituting the control device 4 is provided on two circular substrates 47.

[0037] In this way, by distributing the single integrated circuit constituting the control device 4 across multiple circular substrates 47, the diameter of the circular substrates 47 can be reduced, making it possible to house them within the housing 1. Furthermore, for high-speed rotating devices such as ultrasonic holders A, a smaller diameter is advantageous, and the small diameter of the circular substrates 47 contributes to this advantage as well.

[0038] Therefore, the control device 4 can be housed within the housing 1, and even if the ultrasonic holder A rotates at high speed, it will not be affected in a way that disrupts the rotational balance or otherwise adversely impacts the rotation.

[0039] Next, the operation of the control device 4 related to the ultrasonic holder A will be explained.

[0040] The control device 4 generates ultrasonic vibrations. Specifically, the control means 41 related to the control device 4 outputs a command to supply power to the battery 5. Upon receiving this power supply command, the battery 5 supplies power to the DC-DC converter 42. The DC-DC converter 42 boosts / steps down the DC voltage input from the battery 5 and outputs it to the high-voltage driver IC 43. The high-voltage driver IC 43 converts the transformed DC voltage input from the DC-DC converter 42 into an AC voltage, changes the frequency if necessary, and supplies an AC voltage with a predetermined frequency (for example, 40 kHz) to the electrodes connected to the piezoelectric element 21. When the AC voltage is applied to the electrodes, the piezoelectric element 21 vibrates ultrasonically, and the resonator 22, which is integrated with the piezoelectric element 21, also resonates.

[0041] In order to use a battery 5 that outputs DC power to cause ultrasonic vibration of the piezoelectric element 21, a circuit is needed to boost the DC voltage, convert it to AC current, and output a high frequency. If such a circuit were to be constructed using analog circuits, each element would become large, resulting in a large overall circuit. Therefore, it was difficult to incorporate the battery 5 for ultrasonic vibration into the ultrasonic holder. However, as in Example 1 of this embodiment, by using a control device 4 equipped with a microcontroller-like control means 41 to digitally control the ultrasonic holder A, the size of the circuit was reduced, making it possible to incorporate it into the ultrasonic holder A.

[0042] Furthermore, the control means 41 acquires monitoring information related to the operating state of the ultrasonic holder A, such as the current and voltage output from the battery 5 and the amount of rotation of the ultrasonic holder A, through the acceleration sensor 44, and outputs it to the outside in the form of infrared light through the optical communication IC 45.

[0043] Furthermore, the control means 41 operates the DC-DC converter 42 and the high-voltage driver IC 43 based on monitoring information related to the current and voltage output from the battery 5, supplying the optimal voltage for the piezoelectric element 21 to vibrate. For example, when it recognizes that the voltage output from the battery 5 has decreased, it operates the DC-DC converter 42 to boost the input voltage from the battery 5, supplying the optimal voltage for the piezoelectric element 21 to vibrate.

[0044] Thus, the control means 41 monitors the current and voltage output from the battery 5, and if there is a fluctuation, it operates the DC-DC converter 42, etc., in accordance with the fluctuation. This configuration allows for the supply of an optimal voltage for the piezoelectric element 21 to vibrate according to the remaining power of the battery 5, which is convenient. Therefore, in order to stabilize the voltage supplied to the piezoelectric element 21, a voltage regulator (not shown) may be provided at an appropriate point in the circuit from the battery 5 to the piezoelectric element 21.

[0045] Furthermore, when the control device 4 recognizes, via the acceleration sensor 44, that the rotation of the spindle 2 related to the ultrasonic holder A exceeds a predetermined number, it generates ultrasonic vibration. Specifically, when the control means 41 of the control device 4 recognizes, via the acceleration sensor 44, that the rotation of the spindle 2 related to the ultrasonic holder A exceeds a predetermined number, it outputs a command to the battery 5 to start supplying power to the piezoelectric element 21. When the battery 5 receives the start command, it starts supplying power. Also, when the control device 4 recognizes, via the acceleration sensor 44, that the rotation of the spindle 2 related to the ultrasonic holder A falls below a predetermined number, it stops the ultrasonic vibration. Specifically, when the control means 41 of the control device 4 recognizes that the rotation of the spindle 2 related to the ultrasonic holder A falls below a predetermined number, it outputs a command to the battery 5 to stop supplying power to the piezoelectric element 21. When the battery 5 receives the stop command, it stops supplying power.

[0046] This configuration allows for the automatic switching of ultrasonic vibrations on and off according to the rotational speed of the spindle 2 related to the ultrasonic holder A, which is convenient.

[0047] Furthermore, the control means 41, based on the remaining power information stored in the battery 5 obtained through the battery 5, outputs a command to the battery level monitor display 46 to display "green" if the remaining power of the battery 5 is above a predetermined value, and outputs a command to display "red" if it is below the predetermined value. The battery level monitor display 46 displays a color corresponding to the remaining power of the battery 5 based on the display command.

[0048] This configuration allows the remaining charge of battery 5 to be visually monitored, and when the remaining power becomes low, battery 5 can be recharged.

[0049] <Variation> In the above embodiment example 1, the control device 4 generates ultrasonic vibration when it recognizes, via the acceleration sensor 44, that the rotation of the spindle 2 related to the ultrasonic holder A exceeds a predetermined number, and stops the ultrasonic vibration when it recognizes that the rotation of the spindle 2 related to the ultrasonic holder A falls below a predetermined number. However, the configuration is not limited to this. For example, the control means 41 may output a command to stop the ultrasonic vibration when it recognizes, via the acceleration sensor 44, that the rotation of the spindle 2 related to the ultrasonic holder A falls below a predetermined number (less than a predetermined number). Such a configuration is convenient because it reduces power waste, saves power, and extends the battery life.

[0050] Furthermore, in the above embodiment example 1, the battery 5 is configured to be charged externally via a wired (or wireless) connection without being removed from the housing 1, but the configuration is not limited to this. For example, the battery 5 may be removed from the housing and charged with a charger.

[0051] Furthermore, in the above embodiment example 1, a configuration was shown in which a single integrated circuit constituting the control device 4 is provided on multiple circular substrates 47, and each circular substrate 47 is provided concentrically with the main axis 2. However, the configuration is not limited to this. For example, a single integrated circuit constituting the control device 4 may be provided on a single circular substrate 47, and the circular substrate 47 may be provided concentrically with the main axis 2.

[0052] Furthermore, in the above embodiment example 1, the control means 41 is configured to output a command to the battery level monitor display 46 to display "green" if the remaining power of the battery 5 is above a predetermined value, and to output a command to display "red" if it is below the predetermined value, based on the remaining power information of the battery 5 obtained through the battery 5. However, the configuration is not limited to this. For example, the control means 41 may be configured to output a command to the battery level monitor display 46 to display "green" if the remaining power of the battery 5 is above a predetermined value, to blink the "green" display if it is below the predetermined value, and to turn off the display when the remaining power of the battery 5 is depleted. In short, any configuration that displays the remaining power of the battery so that it can be seen from the outside is sufficient.

[0053] Furthermore, in the above embodiment example 1, the battery 5 housed in the housing 1 was shown to supply power to the control device 4 that controls the ultrasonic holder A and the piezoelectric element 21. However, the configuration is not limited to this. As shown in Figures 6 and 7, instead of the battery 5, a generator 7 may be used to supply power to the control device 4 and the piezoelectric element 21.

[0054] When the main shaft 2 is rotated, the rotor (rotor, not shown) of the generator 7 rotates relative to the stator (stator, not shown) in accordance with the rotation. As a result, if a DC generator is used, the generator 7 generates DC power and supplies the generated power to the control device 4 and the piezoelectric element 21. In other words, the generator 7 generates electricity using the rotational force of the main shaft 2. Note that the configuration is not limited to using the main shaft 2 as long as the generator 7 can receive rotational force. Also, the generator 7 is not limited to a DC generator, and a configuration using an AC generator is also possible. For example, if a three-phase synchronous generator is used as the AC generator, it generates three-phase AC power and supplies the generated power to the control device 4 and the piezoelectric element 21. Note that in the case of a configuration using an AC generator, the DC-DC converter 42 is not required. [Explanation of Symbols]

[0055] A: Ultrasonic holder, 1: Housing, 2: Main shaft, 21: Piezoelectric element, 22: Resonator, 221: Fixing hole, 23: Tool chuck, 3: Arba, 4: Control device, 41: Control means, 411: Chip control unit, 412: Chip memory unit, 413: I / O port, 414: Timer, 415: Serial communication interface, 416: Analog-to-digital converter, 417: Digital-to-analog converter, 42: DC-DC converter, 43: High-voltage driver IC, 44: Accelerometer, 45: Optical communication IC, 46: Battery level monitor indicator, 47: Circular substrate, 5:Battery, 6 tools, 7: Generator

Claims

1. An ultrasonic holder that is attached to the rotating spindle of a machine tool and is used to grip a tool, and is also equipped with the function of applying ultrasonic vibrations to the tool, The ultrasonic holder comprises a housing and a main shaft, part of which is housed within the housing and the other part of which protrudes from the housing. The housing includes a control device for controlling the ultrasonic holder and a battery for supplying power to the piezoelectric element. The ultrasonic holder is characterized in that the main shaft has a piezoelectric element that vibrates ultrasonically when power is supplied, and a resonator connected to the piezoelectric element that amplifies the vibration of the piezoelectric element.

2. An ultrasonic holder that is attached to the rotating spindle of a machine tool and is used to grip a tool, and is also equipped with the function of applying ultrasonic vibrations to the tool, The ultrasonic holder comprises a housing and a main shaft, part of which is housed within the housing and the other part of which protrudes from the housing. The housing includes a control device for controlling the ultrasonic holder and a generator for supplying power to the piezoelectric element. The ultrasonic holder is characterized in that the main shaft has a piezoelectric element that vibrates ultrasonically when power is supplied, and a resonator connected to the piezoelectric element that amplifies the vibration of the piezoelectric element.

3. The ultrasonic holder according to claim 1 or 2, characterized in that the control device boosts the DC voltage related to the power supplied from the battery or the generator, converts the boosted DC voltage into an AC voltage, and outputs the converted AC voltage to the piezoelectric element.

4. The control device further includes a rotation sensor for detecting the rotation of the main spindle, The ultrasonic holder according to claim 1 or 2, characterized in that the control device generates ultrasonic vibration when it recognizes through the rotation sensor that the rotation of the main spindle exceeds a predetermined number, and stops the ultrasonic vibration when it recognizes that the rotation of the main spindle has fallen below the predetermined number.

5. The ultrasonic holder according to claim 1, characterized in that the battery can be charged externally by wire or wireless connection while it is built into the housing.

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