JP7639245B2 - Tool holder unit - Google Patents

Description

The present invention relates to the structure of an approximately cylindrical tool holder unit that detects in real time the temperature and/or vibration of a rotating tool of a rotary processing device such as a cutting device.

In rotary processing equipment such as cutting equipment, it is necessary to evaluate the condition of the tool during processing, such as wear, fatigue, breakage, and chatter, when considering the product precision of the workpiece, manufacturing efficiency, and yield of the processed product. Traditionally, tool evaluation has been performed based on evaluation criteria that are generalized by equipment manufacturers and tool manufacturers for each device or tool, and academically standardized evaluations. However, real-time verification of the actual tool during processing has not been possible.

In response to this, the applicant has developed and provided a tool holder unit capable of measuring the temperature of a rotating tool (hereinafter also referred to as "rotating tool") during machining, and has also developed and provided anomaly prediction technology based on the results of this measurement (see Patent Documents 1 and 2). It is also known that vibration and stress, in addition to temperature, are important factors in causing tool damage, etc. The applicant has also focused on this point, and has developed and provided technology that can detect abnormal vibrations of a rotating tool in real time with the tool holder and analyze them in an external unit via wireless transmission (see Patent Documents 3, 1, etc.).

In the case of conventional tool holder units, the electronic board and rechargeable battery are mounted inside the tool holder, which rotates at high speed, and in order to improve the accuracy of the measuring device, it was necessary to consider the problems of large centrifugal force, the decrease and attenuation of the output radio waves from the electronic board to the outside and external parts, and the generation of noise due to interference. In addition, it is desirable to mount the electronic components that process the measurement data mounted inside the tool holder, the wireless transmission antenna connected to the rechargeable battery, and the battery charging device on the outside for ease of access. On the other hand, the outside of the tool holder unit is exposed to high-temperature, high-pressure, and high-speed cutting oil, cutting chips, cooling water, etc., and it is necessary to protect the wireless communication device, the power supply terminal to the rechargeable battery, and the internal electronic board from these. It is also necessary to have a fixing force that can withstand large centrifugal forces. In addition, wireless communication devices are required to transmit radio waves sufficiently to the outside in such a harsh environment.

In particular, in the case of split tool holders, which will be described later, the structure is such that cutting fluid and the like can easily enter from the outside at the connection points of the split parts, so even though it is a split type, it needs to have a sufficient waterproof and drip-proof effect and a centrifugal force resistant structure. Furthermore, when data from the thermocouple in the rotating tool is received and processed by electronic components mounted on an electronic board in the tool holder unit, the adverse effects of directly connecting the thermocouple wires to the internal electronic board must also be taken into consideration.

International Publication WO2015-022967 International Publication WO2016-111336 JP 2018-54611 A

The present invention was created in light of these circumstances, and aims to provide a suitable structure for a tool holder unit that is attached to the spindle of a rotary processing device and can measure the temperature, vibration, etc. of a rotating tool in real time, which can transmit wirelessly with high accuracy during high-speed rotation, can measure temperature while preventing the intrusion of external cutting oil, etc., and is easy to charge and assemble.

Antenna unit Specifically, the present invention is
A substantially cylindrical tool holder unit that detects temperature information and/or vibration information of a rotary tool during processing by a rotary processing device in real time and transmits the information wirelessly to an outside,
the tool holder unit holds a rotary tool at a lower chuck portion side and is held by a spindle of a rotary processing device at an upper shank portion side, and includes an electronic board unit that is mounted in an internal space and receives and transmits at least temperature information and/or vibration information of the rotary tool, and an antenna unit that receives the temperature information and/or vibration information from the electronic board unit via an antenna cable and wirelessly transmits the information to the outside,
The antenna unit is attached to the outer periphery of the tool holder unit in a state where the inside is sealed from the outside.

Furthermore, this tool holder unit has the following features:
an outer cover member made of an insulating material having radio wave permeability, the outer cover member having a radially outer surface that forms a semicircular arc shape continuous with an outer peripheral surface of the tool holder unit;
an inner cover member attached to the outer cover member from the radially inner side to form a semicircular arc shape;
The inner cover member has a substrate antenna which is a flexible, approximately plate-like member that connects, on its radially inner surface, the end of an antenna cable which is passed from the radially inside to the radially outside of the inner cover member, and which is sealed and mounted within the gap between the inner cover member and the outer cover member when attached to the radially outside of the inner cover member.

In this tool holder unit, an electronic board unit that receives and processes temperature data, vibration data, etc. is disposed in the internal space of the tool holder unit, and an antenna unit that transmits temperature data, etc. received by the electronic board unit to the outside is separated from the electronic board unit and disposed on the outer periphery of the tool holder unit. This allows wireless transmission of information on the rotating tool from the tool holder unit rotating at high speed with many interfering members in close proximity inside and around it, while reducing noise caused by interference and transmitting the information with high accuracy. In addition, as a configuration for disposing the antenna unit on the outer periphery, a configuration is adopted in which the antenna unit is integrated with the outer periphery of the cylindrical tool holder unit, reducing excess vibration and load during high-speed rotation while preventing the intrusion of cutting oil, etc. Specifically, a plate-shaped board antenna is bent and enclosed in the gap formed between the inside of the outer cover member that is continuous with the outer surface of the tool holder unit and the outside of the inner cover member that is sealed and attached to it. In addition, this antenna unit can be created simply by stacking parts in the radial direction, so it is easy to assemble.

In this typical tool holder unit,
the inner cover member has a recess on its radially outer surface that abuts against and receives the radially inner surface of the substrate antenna, and a protrusion protruding from an upper edge portion;
the substrate antenna has a radially inner side that is abutted against and received in the recess of the inner cover member, and a circumferential portion that has a thick portion that is thicker radially outward;
the outer cover member has a frame member standing radially inward along an upper edge portion and a lower edge portion, a receiving surface that abuts and receives the radially outer side of the substrate antenna on the radially inner side between the top and bottom of the frame member, a notch portion that is a part of the frame member and that fits and receives a protrusion of the inner cover member, and a recess that fits and receives a thick portion of the substrate antenna,
With the board antenna received and fixed in the recess of the inner cover member, the protrusion of the inner cover member and the thick portion of the board antenna are fitted into the cutout portion and recess of the outer cover member, respectively, to adhesively fix the inner cover member and the outer cover member.

Further, the tool holder unit of the present invention comprises:
a tool holder unit for mounting the electronic board unit, the tool holder unit having an internal space communicating with the outside;
A generally cylindrical boss having a through hole penetrating from inside to outside and an annular groove along an outer periphery protrudes from the radially inner side of the inner cover member and is inserted and fixed into the antenna hole,
the antenna cable is attached to the board antenna through a through hole of the boss inserted and fixed to the antenna hole from the electronic board unit,
It is preferable that an O-ring is disposed between the inner wall of the antenna hole and the annular groove of the boss, and an adhesive is filled between the through hole of the boss and the antenna cable.

With this antenna unit, a boss for mounting an antenna cable protrudes from the inner cover member, and this boss is inserted and fixed into the antenna hole on the tool holder unit side, allowing the board antenna to be easily connected to the electronic board unit in the shortest distance. In particular, the antenna hole can be created simply by drilling from the outside to the space where the electronic board unit is located, and if the tip of the antenna cable that connects to the electronic board is brought out of the antenna hole while the electronic board is being assembled, a wireless transmission structure can be easily created by simply connecting it to the board antenna through the boss and assembling the antenna unit, making the assembly work of the tool holder unit easier and significantly improving versatility. Furthermore, this structure is advantageous in that cutting oil, etc. can be prevented from entering the electronic board unit and antenna unit simply by sealing the boss and the antenna hole.

Charging unit Also, in this tool holder unit,
a charging unit attached to the tool holder unit so as to form an outer peripheral surface of the tool holder unit on the same horizontal plane as the antenna unit, the charging unit comprising:
a charging cable connected to a battery that is connected to the electronic board unit and supplies power thereto, and the charging cable is connected to the battery and supplies power thereto for charging the battery;
an outer cover member made of an insulating material, the outer surface of which in the radial direction is continuous with the outer peripheral surface of the tool holder unit and forms a semicircular arc shape having the same curvature as the antenna unit;
an inner cover member having a semicircular arc shape and attached to the outer cover member from the radially inner side;
a terminal board that is a generally plate-shaped member that connects an end of a charging cable that is passed from the radially inner side to the radially outer side of the inner cover member, and is attached and fixed to the radially inner side of the outer cover member by a fixing screw;
A configuration is also provided in which the tip of the fixing screw is exposed to the outside from the outer cover member and serves as an electric terminal for receiving a supply of electric power from the outside.

This charging unit supplies charging power from the outside to a charging battery that serves as the power source for the electronic board unit arranged in the internal space of the tool holder unit. In the tool holder unit, the electronic board unit and the battery are arranged in order in the space inside the tool holder unit, and the charging unit is provided on the outer periphery of the tool holder unit by separating it from the electronic board unit and the charging battery, and the electrical terminal of the charging cable is exposed on the outer periphery of the tool holder unit. In addition, the outer cover member of this charging unit forms part of the outer periphery surface of the tool holder unit together with the outer cover member of the antenna unit, so it does not interfere with the surrounding components during high-speed rotation, and is well suited to be combined with the antenna unit from the viewpoint of weight balance and prevention of excess vibration and load. In addition, the fixing screw of the terminal board that is electrically connected and fixed to the tip of the charging cable serves both as a fixing screw to the outer cover member and as an electrical terminal for connecting to an external plug and receiving a supply of power, so the number of parts can be reduced and the space can be reduced. Furthermore, this charging unit can be made simply by stacking the parts in the radial direction, so it is easy to assemble.

in particular,
The inner cover member has a radially outer surface that abuts against and receives a radially inner surface of the terminal board,
the outer cover member has a frame member that stands radially inward along an upper edge portion and a lower edge portion, and a recess that receives the terminal board , the recess having a through hole into which the fixing screw can be inserted,
the terminal board has a shape to be fitted into the recess of the outer cover member, and has a through hole at a position where the through hole through which the fixing screw can be inserted is visible when the terminal board is fitted into the recess of the outer cover member;
The fixing screw has a large diameter head and a tubular portion with a smaller diameter than the head and extending radially inward, and with the terminal board fitted into a recess in the outer cover member, the small diameter tubular portion is inserted and fixed from the radially inside into the through hole of the terminal board and the through hole of the outer cover member, thereby fixing the terminal board to the outer cover member.

The tool holder unit includes a charging cable hole that communicates with the outside from an internal space of the tool holder unit to which the electronic board unit is attached.
A substantially cylindrical boss having a through hole penetrating the inside from the inside to the outside and an annular groove along an outer periphery protrudes from the radially inside of the inner cover member and is inserted and fixed into the charging cable hole;
the charging cable is attached to the terminal board through a through hole of the boss that is inserted and fixed to the charging cable hole from the battery,
This tool holder unit may be one in which an O-ring is disposed between the inner wall of the charging cable hole and the annular groove of the boss, and adhesive is filled between the through hole of the engaging boss and the charging cable.

With this charging unit, a boss for attaching the charging cable protrudes from the inner cover member, just like the antenna unit, and this boss is inserted and fixed into the charging cable hole on the tool holder unit side, easily connecting the terminal board to the battery over the shortest distance. The charging cable hole can be created simply by drilling from the outside to the space where the electronic board unit and battery are located, and if the tip of the charging cable is extended from the charging cable hole, a structure can be created that can easily supply uncharged power from the outside by simply connecting it to the terminal board through the boss and assembling the charging unit. Also, just by sealing the boss and the charging cable hole, cutting oil and the like can be prevented from entering the electronic board unit, battery, and charging unit, just like the antenna unit.

Weight balance adjustment . The outer cover member of the antenna unit and the outer cover member of the charging unit are injection molded resin bodies, each having a semicircular arc shape of less than 180°, and their ends are connected by a small metal cover member to form the outer peripheral surface of the tool holder unit, and the small cover member has a recess for fitting that penetrates in the radial direction.
a key member that is connected to a tool holder unit on a radially inner side of the inner cover member of the antenna unit and the inner cover member of the charging unit, and has a projection that projects radially outward;
A configuration is also provided in which, when each small cover member is connected to both ends of the outer cover member of the antenna unit and the outer cover member of the charging unit, the protrusion of the key member is inserted into the recess of the small cover member, thereby positioning the antenna unit and the charging unit in the rotational direction.

In this example, the outer cover member and inner cover member of the antenna unit and charging unit are formed in an arc shape of less than 180° for the convenience of injection molding (taking into account the so-called draft angle), and the antenna unit and charging unit cannot form a 360° ring, resulting in a gap around the outer circumference. For this reason, in order to fill the gap and form a 360° ring-shaped member with the entire outer cover members of the antenna unit and charging unit, two small cover members are assembled between the ends of the two to completely cover the outer circumference. At this time, each small cover member is positioned by a key member, so the antenna unit and charging unit can be easily positioned in the rotational direction. In addition, considering that the small cover members will receive force in the rotational direction against the resin antenna unit and charging unit, the small cover members are formed from a metal material that is stronger and easier to machine than resin.

Further, a pair of screw holes having the same diameter are provided on both sides in the X direction and a pair of screw holes are provided on both sides in the Y direction on a horizontal plane relative to the rotation axis on an outer circumferential surface of the tool holder unit, the screw holes being drilled in the radial direction,
It is also possible to prepare locking screws of the same diameter and the same or different lengths that can be inserted into each screw hole and screwed, and insert the locking screws into each screw hole and screw them to adjust the weight balance of the tool holder unit in the X and Y directions.

Tool holder units rotate at high speeds, and if the weight balance in the XY directions is unbalanced, it causes rotational wobble and excessive vibration and load. Even if a tool holder unit is machined and assembled with high precision, it may not be possible to provide one with a completely uniform weight balance. In particular, when high-precision temperature and vibration measurements are required, the impact of unbalanced weight balance is significant, and eliminating this makes it possible to evaluate even minute temperature and vibration changes that were previously unmeasurable. From the perspective of providing a tool that can evaluate highly accurate phenomena of rotating tools in real time using this tool holder unit, the present invention allows the weight balance to be adjusted after the fact using a set screw.

Another example is a tool holder unit in which the set screw has a through hole or semi-through hole in the central axial direction, a rod member that can be inserted into the through hole or semi-through hole and has a density different from that of the set screw is prepared, and the rod member is inserted and fixed into the through hole or semi-through hole of the set screw fastened to the screw hole.

In this example, taking into consideration cases where weight balancing is not possible or difficult to achieve with only two pairs of locking screws in the XY directions, rod members of different densities are inserted into the locking screws, making it possible to easily adjust the weight of the locking screws themselves without having to prepare a large number of locking screws of different densities, and making it possible to adjust the weight balance of the tool holder unit with a small number of parts.

Temperature Sensor Unit The tool holder unit includes a temperature sensor unit that electrically connects the electronic board unit and a thermocouple in a rotary tool, and the temperature sensor unit includes:
A hollow cylindrical main body portion;
a flange portion provided at a bottom of the cylindrical main body portion and having a flange portion protruding radially outward and attached below the bottom portion;
a terminal board that closes an upper portion of the cylindrical main body;
a movable substrate that slides vertically between a bottom of the cylindrical main body and the terminal substrate within the cylindrical main body and electrically connects to an upper end of a wire from a thermocouple in a rotary tool;
a spring member made of a conductive material that is disposed between the movable substrate and the terminal substrate to apply an elastic force in a vertical direction to both of them and electrically connect them to each other;
a tubular member into which a wire from a thermocouple in a rotary tool is inserted, the upper end of which is connected to the movable substrate and the lower end of which is connected to the inside of the rotary tool;
In some cases, it is equipped with.

In this example of the tool holder unit, a tubular member that transmits vibrations from a rotating tool is attached, and a thermocouple and wire (covered with a sheath) are inserted inside it. When the rotating tool is tightened with a collet, the rotating tool is pulled upward, and the tubular member and the wire of the thermocouple are also pulled in, which may cause buckling and destruction of the thermocouple and wire between the lower surface of the bottom of the internal space in which the electronic board unit is disposed (the upper surface of the space in which the collet is disposed). To avoid this, the tool holder unit is provided with the present temperature sensor unit. In this temperature sensor unit, the flange portion functions as a stopper for upward movement, and the wire from the tubular member and the thermocouple is fixed to the movable board that slides up and down inside the cylindrical main body, preventing the tubular member and wire from being pulled in and buckling and destroying them. In addition, when the tubular member is not pulled in or is released, the movable board slides downward due to the spring member, so that it can flexibly respond to the vertical movement of the tubular member and the wire from the thermocouple. Furthermore, the spring member also has the function of electrically connecting the movable board and the terminal board, and by simply inserting this temperature sensor unit into the installation space of the electronic board unit, the temperature sensor of the electronic board unit can be connected to the terminal board that forms its upper surface.

Specifically, the temperature sensor unit has a threaded portion that protrudes downward from the flange portion and is screwed into the tool holder unit, the threaded portion, the flange portion and the bottom of the cylindrical main body portion have through holes that penetrate from below to the inside of the cylindrical main body portion, the inside of the cylindrical main body portion has a pin member that connects in the vertical direction from the bottom to the terminal board, the spring member is a coil spring that is slidably wrapped around the pin member and is arranged from the movable board to the terminal board, and the tubular member is inserted slidably in the vertical direction with the through hole that penetrates from below to the inside of the cylindrical main body portion sealed by a sealing means.

In addition, the sealing means in the temperature sensor unit is a ring-shaped O-ring made of two elastic materials and a ring-shaped washer made of a metal material, the ring-shaped O-ring and the ring-shaped washer being disposed around the outer periphery of the tubular member through a central hole,
The two O-rings are each elastically intimately contacted with the inner wall of the through hole inside the threaded portion and the outer circumferential surface of the tubular member at their outer circumferential edges and the inner wall of the central hole,
It is preferable that the washer is interposed vertically between the two O-rings.

This sealing means allows the tubular member (and the wires from the thermocouple) to be properly sealed in a sliding state within the temperature sensor unit. Specifically, a metal washer is sandwiched from above and below around the tubular member by an O-ring made of resin or the like. By adopting this configuration, even if an O-ring made of soft material such as resin, which is a normal sealing member, deforms as the tubular member slides, the presence of the washer made of a hard material limits the deformation, preventing it from becoming irreversible. Therefore, a high level of sealing can be maintained.

The tool holder unit of the present invention is advantageous in that it provides a suitable structure for a tool holder unit that is attached to the spindle of a rotary processing device and capable of measuring the temperature, vibration, etc. of a rotating tool in real time, and that is capable of wirelessly transmitting with high accuracy during high-speed rotation within the rotary processing device, and that can measure temperature and charge while preventing the intrusion of external cutting oil, etc.

FIG. 2 is a cross-sectional view of a tool holder unit according to the present invention. FIG. 2 is an exploded perspective view showing a state in which the tool holder unit shown in FIG. 1 is divided. FIG. 2 is a cross-sectional view showing a state immediately before the tool holder unit shown in FIG. 1 is connected. FIG. 2 is a perspective view showing a state in which the tool holder unit shown in FIG. 1 is connected and a collet and a nut are attached to a chuck portion. 2 is a see-through perspective view showing a state in which an electronic board unit is mounted in a recessed space provided in a chuck-side connecting portion of a chuck portion of the tool holder unit shown in FIG. 1 . FIG. FIG. 11 is an enlarged cross-sectional view of the vicinity of a connection portion between a chuck portion and a shank portion with an electronic board unit attached thereto; FIG. 13 is an exploded perspective view seen from above, showing a structure in which a battery unit is connected and fixed to a power supply terminal of an uppermost electronic board with an electronic board unit fixed in a recessed space of a chuck portion. FIG. FIG. 9 is a bottom view of the exploded view of FIG. 8 . FIG. 2 is a perspective view showing the configuration of the antenna unit in an assembled state. 11 is an exploded perspective view of the antenna unit showing a state in which an outer cover member is attached. FIG. FIG. 2 is a partially enlarged cross-sectional view of the tool holder shown in FIG. 1 , illustrating the vicinity of the antenna unit. FIG. 4 is a partially enlarged cross-sectional view of the tool holder in the vicinity of the antenna unit. 11 is a perspective view of the antenna unit of FIG. 10 as viewed from the inner cover member side. FIG. 2 is an exploded perspective view of the components of the antenna unit. FIG. 2 is a perspective view showing the configuration of the charging unit in an assembled state. FIG. 4 is a partially enlarged cross-sectional view of the tool holder showing the vicinity of the charging unit. 11 is a perspective view of a state in which an antenna unit and a charging unit are attached to a chuck portion. FIG. FIG. 13 is a cross-sectional view of the tool holder unit with a collet, a nut and a rotating tool. 5A and 5B are longitudinal cross-sectional views of a temperature sensor unit, in which FIG. 5A shows the state when uncompressed and FIG. 5B shows the state when compressed; 1 shows the vicinity of a movable substrate c in a cylindrical main body of a temperature sensor unit, with (a) being a partially transparent perspective view and (b) being a partially sectional view. FIG. 1A shows an exploded perspective view of the temperature sensor unit and the tool holder unit viewed from below without the collet, nut, and rotating tool, and FIG. 1B and FIG. 1C show transparent perspective views of the temperature sensor unit viewed from diagonally above and below, respectively. FIG. 2 is a partial cross-sectional view of the vicinity of a temperature sensor unit of the tool holder unit, and shows an internal structure of the temperature sensor unit in a perspective view. FIG. 13 is a schematic cross-sectional view of a tool holder unit having a cooling oil passage therein. FIG. 11 is a partial cross-sectional view of a tool holder unit showing a structure for preventing coolant from entering the temperature sensor unit. FIG. 13 is a schematic cross-sectional view showing adjustment of the weight balance of a tool holder unit in which the shank portion is cut horizontally at the height of the fastening screw.

<Basic structure of tool holder unit>
In this embodiment, in explaining a specific example of the structure of the tool holder unit of the present invention, a case where the tool holder unit is attached to a split type tool holder unit will be explained as an example. Note that, although a split type tool holder unit will be explained as an example here, the structure of the present invention is not only applicable to split type tool holder units, but can also be applied to integrated type tool holder units.

Figure 1 shows a cross-sectional view of the tool holder unit 10 of the present invention, Figure 2 shows an exploded perspective view showing the tool holder unit in a divided state, and Figure 3 shows a cross-sectional view showing the state immediately before the tool holder unit is connected. Figure 4 shows a perspective view showing the state in which the tool holder unit 10 of the present invention is connected and a collet and a nut are attached to the chuck portion.

The split tool holder unit 10 is configured by connecting in the vertical direction a chuck portion 11 that grips a rotating tool such as a cutting tool with a lower collet 28 and nut 29 (see Figure 4 (positions 17 and 18 in Figure 1)) and a shank portion 12 that is gripped by a spindle of a rotary processing device such as a machining center (not shown, but located above in Figure 1). The chuck portion 11 has an annular flange portion 20 protruding around the outer periphery at a vertical intermediate position. Below the flange portion 20, the shank side connecting portion 19 extends, having a reduced diameter than the flange portion 20. The inside of the shank portion 12 has a cylindrical tapered recess 16 that reduces in diameter upward from the lower end 19a of the shank side connecting portion 19.

The chuck-side connecting part 21 extends above the chuck part 11, tapering upward from the flange part 13, and has a cylindrical recessed space 14 with an open top. This recessed space 14 is a space into which an electronic board or the like, described later, is inserted and fixed. The shank part 12 and the chuck part 11 of the tool holder unit 10 are connected to each other by inserting (pressing) the tapered recessed part 16 of the shank-side connecting part 19 into the tapered part 15 of the chuck-side connecting part 21 in a nested manner until the lower end 19a abuts the flange part 13. In addition, the nut connecting part 24 extends below the chuck part 11, has a hollow space 17 that narrows upward for inserting a collet 28 that holds a rotating tool inside, and is fitted with a nut 29 that tightens the collet 28 from the outside to fix the rotating tool, and has a flange part 13 at its upper base. .

Although each component will be described in detail later, the chuck portion 11 is provided with an antenna unit 50 and a charging unit 60, and the outer cover member 52 of the antenna unit 50, which forms part of the outer surface of the chuck portion 11, and the charging unit 60 and outer cover member 62 are attached to the flange portion 13 at the base of the nut connecting portion 24, and are sandwiched and fixed from above and below by the flange portion 20 of the shank portion 12 and the annular cover 26 arranged on the outer periphery of the nut connecting portion 24. The annular cover 26 is made of aluminum, and is fastened to the screw hole 27a of the chuck portion 11 with a fixing screw 27.

<Structure and arrangement of electronic board unit>
Fig. 5 is a perspective view showing a state in which the electronic board unit 30 is mounted in the recessed space 14 provided in the chuck side connecting portion 21 of the chuck portion 11. Fig. 7 is an enlarged cross-sectional view of the vicinity of the connecting portion between the chuck portion 11 and the shank portion 12 in a state in which the electronic board unit 30 is mounted. As described above, the chuck portion 11 and the shank portion 12 are connected by inserting the chuck side connecting portion 21 into the shank side connecting portion 19 in a nested manner and press-fitting the tapered portion 15 on the outer peripheral surface of the chuck side connecting portion 21 into the tapered recessed portion 16 on the inner peripheral surface of the shank side connecting portion 19. The recessed space 14 of the chuck side connecting portion 21 has an opening at the top and forms a cylindrical recess at the bottom, and the electronic board unit 30 is inserted and fixed therein.

First, the substrate mounting base 31 is placed and fixed on the bottom 14a of the recessed space 14 (see FIG. 1). FIG. 6 shows a perspective view of the substrate mounting base 31. The substrate mounting base 31 is a disk-shaped member having a thickness made of an insulating material such as resin, and is lowered in the thickness direction along the inner diameter of the recessed space 14 of the chuck part 11 from above, and its bottom 31a is placed on the bottom 14a of the recessed space 14. At this time, adhesive is applied to the bottom 31a (or bottom 14a) and fixed in place. Furthermore, adhesive is applied to the side 31b of the substrate mounting base 31, and it is also sufficiently fixed to the inner wall 14b of the recessed space 14. In addition, multiple grooves are provided in the circumferential direction on the side 31b to improve adhesion and prevent the adhesive from leaking out.

The top surface of the board mounting base 31 is provided with a downwardly recessed countersunk 31f, and a rim 31h is provided along the periphery of the countersunk 31f. This countersunk 31 is the space in which the electronic components of the bottom electronic board 31 described later are received. The center of the countersunk 31f is provided with a through hole 31c for the temperature sensor unit through which the temperature sensor unit 35 can protrude from below. A pair of notches 31d are provided at 180° symmetrical positions on the side of the board mounting base 31, and each of these is a space through which the antenna cable and charging cable described later pass. The rim 31h is provided with four support stands 31i at 90° intervals for the bottom electronic board 31 and the spacer (described later) fixed thereon, which protrude radially into the countersunk portion 31f, and a screw hole 31e is drilled in the center of the support stand 31i. Furthermore, eight pin receiving holes 31g are drilled in the counterbore 31f to prevent the sockets and pins for electrical connection between the electronic boards 32 to 34 (described later) from hitting them, thereby shortening the overall length of the electronic board unit 30.

When the board mounting base 31 is placed and fixed on the bottom 14a of the recessed space 14, a first electronic board 31 (also referred to as the "lowest electronic board 31") made of an insulating material such as resin is stacked on top of it. Electronic components are attached to the underside of the first electronic board 31, and are received in the aforementioned counterbore 31f and glued to the edge 31h. At this time, the first electronic board 31 also has through holes 32e, pin receiving holes 32e, and notches 32d so as to look into the screw holes 31e, pin receiving holes 31e, and notches 31d of the support base 31i. In addition, four cylindrical spacers 36 of the same height are arranged upright above the first electronic board 32 at positions looking into the through holes 32e, and the second electronic board 33 (also referred to as the "upper electronic board 33" and the "lower electronic board 33 of the upper electronic boards") is stacked above these spacers 36.

Similarly, the second electronic board 33 and the third electronic board 34 (also referred to as the "upper electronic board 34" and the "upper electronic board 34 of the upper electronic boards") made of insulating material such as resin are stacked in order on the first electronic board 32 and glued and fixed. At this time, the second electronic board 33 and the third electronic board 34 also have through holes 33e, 34e, pin receiving holes 33e, and notches 33d, 34d so as to look into the screw holes 31e, pin receiving holes 31e, and notches 31d of the support base 31i. Note that the notches 34d of the third electronic board 34 are different from the notches 32d, 33d of the other electronic boards 32 to 33 in that four of them are provided in an arc shape along the outer periphery, but this point will be described later in the explanation of the battery unit holder 42.

In addition, four cylindrical spacers 36 of the same height are arranged upright above the second electronic board 33 at positions looking into the through holes 33e, and the third electronic board 34 is stacked above the spacers 36. Four board fixing screws 37 are arranged from the through holes 34e of the third electronic board 34 through the spacers 36, the through holes 33e, and the spacers 36, 33e, to be screwed into the screw holes 31e of the board mounting base 31. The spacers 36 and the board fixing screws 37 are made of a metal material such as SUS and are conductive, so they serve to electrically connect the electronic components of the electronic boards 32, 34, secure space between the electronic boards 32, 34 and the electronic components, and prevent heat conduction. It should be noted that the board mounting base 31, which is thicker, plays a greater role in preventing heat conduction.

In addition, a power supply terminal 38 for supplying power to each of the electronic boards 32 to 34 and electronic components is provided on the top of the third electronic board 34. This power supply terminal 38 uses a leaf spring type to apply a reaction force upward to fix it so that the electrode 41a of the battery unit 41 described below abuts against it for electrical connection.

<Battery unit structure and arrangement>
Next, a description will be given of the power supply structure for the battery unit and the like mounted above the aforementioned electronic board unit 30. Figures 8 and 9 are exploded perspective views showing a structure for connecting and fixing the battery unit 41 to the power supply terminal 38 of the uppermost electronic board 34 in a state in which the electronic board unit 30 is fixed in the recessed space 14 of the chuck portion 11, with Figure 8 being a view from above and Figure 9 being a view from below.

The battery unit 41 is provided with a frame member 41c on the outer periphery of a disk-shaped rechargeable battery 41a, and the electrodes 41b are exposed from the lower part of the frame member 41a. The outer periphery of the frame member 41c is provided with a protrusion 41d that protrudes radially outward. This battery unit 41 is received from above by a battery unit holder 42. The battery unit holder 42 is made of an elastic material having insulating properties such as resin, and is provided with a counterbore 42a that has an opening at the top and is recessed downward, and the inner diameter of the counterbore 42a is close to the outer diameter of the battery unit 41 to receive the battery unit 41 within the counterbore 42a. A large through hole 42b is drilled in the center of the counterbore 42a, and when the battery unit 41 is received, the electrodes 41b of the battery 41a are exposed downward. In addition, a recess 42d is provided radially outward on the inner wall around the countersunk 42a of the battery unit holder 42, and when the battery unit 41 is received, the protrusion 41d fits into the recess 42d to be positioned in the rotational direction.

In addition, the bottom of the battery unit holder 42 is provided with an arc-shaped protrusion 42c that protrudes downward around the outer periphery. In this example, the central angles of the arcs of the protrusions 42 are different, 43°, 40°, 48°, and 40°. Similarly, the cutouts 34d of the topmost third electronic board 34 are also arc-shaped, and their central angles are set to 43°, 40°, 48°, and 40°. This eliminates the folly of assembling with the wrong angle in the rotation direction, since only the cutouts 34d of the third electronic board 34 corresponding to each of the protrusions 42d of the battery unit holder 42 can be fitted when the battery unit holder 42 is inserted into the recessed space 14 and stacked on the third electronic board 34 for positioning.

Therefore, the battery unit holder 42 not only protects the battery 41a, which is a rechargeable secondary battery and tends to be more vulnerable to vibration and shock than a primary battery, but also allows the electrode 41b of the battery 41a to be correctly assembled with the corresponding leaf spring type power terminal 38 by positioning the convex portion 42c and concave portion 42d with the notch portion 34d of the third electronic board 34 and the protrusion 41d of the battery unit 41. Furthermore, the countersunk portion 42a of the battery unit holder 42 has four semi-through holes 42e at positions where the board fixing screws 37 of the electronic board unit 30 can be seen, preventing electrical interference with the electronic boards 32 to 34 via the board fixing screws 37.

Furthermore, the battery unit holding member 43 is placed on the battery unit holder 42. The battery unit holding member 43 is made of a sponge material (insulating elastic member) such as urethane foam, and when the shank side connecting portion 19 of the shank portion 12 is covered and connected to the chuck side connecting portion 21 of the chuck portion 11, it is inserted between the top surface of the tapered recess 16 of the shank portion 12 and the battery unit 41 and compressed to press the battery unit 41 downward. Therefore, due to the elasticity and insulating properties of the battery unit holding member 43, the battery unit 41 is pressed against the electronic boards 32-34 while being insulated from the shank portion 12 and the chuck portion 11, protecting the battery unit 41 from vibration and impact and fixing it in the vertical direction (the electrical connection state between the electrode 41b and the power terminal 38 is also maintained).

<Antenna unit structure and arrangement>
Next, the tool holder unit 10 has an antenna unit 50 attached to its chuck portion 11. Fig. 10 is a perspective view showing the configuration of the antenna unit 50 in an assembled state, Fig. 11 is an exploded perspective view of the antenna unit showing a state in which an outer cover member is attached, Fig. 12 is a partially enlarged cross-sectional view of the tool holder 10 near the antenna unit 50, Fig. 13 is an assembled and exploded perspective view of each component of the antenna unit 50, and Fig. 14 is a perspective view of the antenna unit 50 in Fig. 10 as viewed from the inner cover member 54 side.

The antenna unit 50 is generally composed of an outer cover member 52, a board antenna 53, an inner cover member 54, an antenna cable 51, and a connector 55, in that order from the outside. The board antenna 53 is a flexible (flexible) plate-shaped antenna that can be arranged on the outermost periphery of the tool holder unit 10, taking into consideration radio interference, noise generation, transmission capacity, etc., in the tool holder unit 10, which has a large environmental load and rotates at high speed. The inner cover member 54 and the board antenna 53 are generally arc-shaped members, and are formed with a curvature that can be attached to each other and fit the outer cover member 52 described later. The inner cover member 54 is an injection-molded resin material member, and as shown in FIG. 13, a recess 54a is provided on the surface of the outer cover member side (the radial outside of the tool holder unit 10) so that the entire back surface of the board antenna 53 can be received and bonded. In addition, a substantially cylindrical fitting boss 56 protrudes from the back surface of the inner cover member 54. 14 and 12, the fitting boss 56 has a through hole 56a at its center that penetrates the inner cover member 54, and an annular groove 56b on its outer circumferential wall. The antenna cable 51 is inserted into this annular groove 56b and attached to the back surface of the board antenna 53. The antenna cable 51 is attached to the back surface of the board antenna 53 by bending its tip in the gap between the back surface of the board antenna 53 and the recess 54a of the inner cover member 54. An adhesive is then filled inside the through hole 56a of the fitting boss 56 to fix the antenna cable 51 so that it does not move due to centrifugal force.

When the board antenna 53 and the antenna cable 51 are fixed to the inner cover member 54, they are attached to the outer cover member 52 in this state as shown in FIG. 11. The outer cover member 52 has an arc-shaped surface that forms the outer surface of the chuck portion 11 as shown in FIG. 4, and is made of a radio wave-transmitting material that can be injection molded, such as resin. The back surface of the outer cover member 52 has a receiving surface 52a that abuts the entire surface of the inner cover member 54, which has the board antenna 53 attached to its edge portions 52c that are parallel to each other in an arc shape, and the surfaces of the inner cover member 54 and the board antenna 53 are abutted against the receiving surface 52a to fit vertically with the outer cover member 52. When abutting against the receiving surface 52a, the edge portions of the surface of the inner cover member 54 are coated with adhesive in a frame shape without any gaps, and the inner cover member 54 is fixed while preventing the intrusion of cutting oil, etc. In addition, a thick portion 53a is formed on the surface of the board antenna 53 on the outer cover member side, and a recess 52b is formed at the corresponding position of the outer cover member 52. This recess 52 b is a portion that receives the thickness of the thick portion 53 a of the board antenna 53 and the tip of the antenna cable 51 that is bent and attached to the back surface of the board antenna 53 .

The inner cover member 54 has a protrusion 54b that protrudes upward along its upper edge. The upper edge 52c of the outer cover member 52 has a notch 52d at a corresponding position. This allows the inner cover member 54 and the outer cover member 52 to be aligned in terms of their relative angles in the rotational direction. The outer cover member 52 and the inner cover member 54 are each made by injection molding, but both are formed in an arc shape of less than 180°. This is because it is necessary to provide a so-called draft angle when removing them from the injection molding die. The charging cover unit 60 is the same in this respect, and the presence of the key 70 and the positioning in the rotational direction, which are reasons why the antenna unit 50 and the charging unit 60 cannot form 360°, will be described later.

12, the fitting boss 56 of the inner cover member 54 is inserted into an antenna hole 57 (see also FIG. 5) through which the recessed space 14 of the chuck portion 11 communicates with the outside. An annular groove 56b is formed on the outer periphery of the fitting boss 56, and the fitting boss 56 is inserted into the antenna hole 57 with a packing such as an O-ring (not shown) fitted in the annular groove 56b to prevent cutting oil and the like from entering the recessed space 14.

<Charging unit structure and installation>
Next, the tool holder unit 10 has a charging unit 60 attached to its chuck portion 11. Fig. 15 is an exploded perspective assembly view of each component of the antenna unit 50, Fig. 16 is a perspective view showing the configuration of the charging unit 60 in an assembled state, and Fig. 17 is an enlarged partial cross-sectional view of the tool holder unit 10 showing the vicinity of the charging unit 60.

The charging unit 60 is generally composed of an outer cover member 62, a charging terminal board 63, an inner cover member 64, a charging cable 61, and a connector 65, in that order from the outside. The charging terminal board 63 is for fixing a terminal for supplying power from an external power source to the battery unit 41 (battery 41a) via a charging cable (electrical cable) 61. The inner cover member 64 and the outer cover member 62 are generally arc-shaped members, and are resin material members that are injection molded with the same curvature as the inner cover member 54 and the outer cover member 52 of the antenna unit 50, respectively. As shown in FIG. 15, the outer cover member 62 has a recess 62b on its back surface that fits and receives the entire surface of the charging terminal board 63 and attaches the charging terminal board 63 with a charging terminal 68 that also serves as a fixing screw. Three through holes 63a, 62d are formed in the charging terminal board 63 and the recess 62b of the outer cover member 62 at positions where they can be seen from each other, and the charging terminal board 63 is fixed to the recess 62b by passing the charging terminal 68 through the through holes 63a, 62d. At this time, the tip of the charging terminal 68 is exposed to the outside from the through hole 62d, and an external power plug is connected to it. In this example, charging by a 3P power plug is assumed.

In addition, a substantially cylindrical fitting boss 66 protrudes from the back surface of the inner cover member 64. As shown in FIG. 17, the fitting boss 66 has a through hole 66a penetrating the inner cover member 64 at its center, similar to the fitting boss 56 of the antenna unit 50 (see FIG. 14), and an annular groove 66b is provided on the outer peripheral wall. The charging cable 61 is inserted into this annular groove 66b and attached to the back surface of the charging terminal board 6. The charging cable 61 is attached to the back surface of the charging terminal board 63 by sandwiching and fixing (electrically connecting) the tip of the charging cable 61 between the head 68a of the charging terminal 68 and the charging terminal board 63 when the charging terminal 68 is inserted and fixed into the through hole 63a, and is bent and fixed in the gap between the back surface of the charging terminal board 63 and the front surface of the inner cover member 64. An adhesive is filled inside the through hole 66a of the fitting boss 66 to prevent the intrusion of cutting oil and the like and the loosening of the fitting boss 66 due to centrifugal force.

Then, with the charging terminal board 63 and charging cable 61 fixed to the outer cover member 62, the inner cover member 62 is attached to the outer cover member 62. As shown in FIG. 4, the outer cover member 62 has an arc-shaped surface that forms the outer surface of the chuck portion 11, and is made of an injection-moldable material such as resin. The back surface of the outer cover member 62 has a receiving surface 62a that abuts and adheres to the entire surface of the inner cover member 64 with the charging terminal board antenna 63 fixed to the frame-shaped edge 62c that surrounds the periphery, and the inner cover member 64 is fixed to the outer cover member 62.

17, the fitting boss 66 of the inner cover member 64 is inserted into a charging cable hole 67 (see also FIG. 5) that connects the recessed space 14 of the chuck portion 11 to the outside. An annular groove 66b is formed on the outer periphery of the fitting boss 66, and the fitting boss 66 is inserted into the charging cable hole 67 with a packing such as an O-ring (not shown) attached to the annular groove 66b to prevent cutting oil and the like from entering the recessed space 14.

<Aluminum alloy cover for positioning and strength support>
Fig. 18 shows a perspective view of the antenna unit 50 and the charging unit 60 attached to the chuck part 11. As can be understood from Fig. 18, Fig. 1 and Fig. 3, the antenna unit 50 and the charging unit 60 are attached by sandwiching the flange part 13 of the chuck part 11 with the edge parts 52c, 62c of the outer cover members 52, 62. As described above, the outer cover member 62 and the inner cover member 64 are formed in an arc shape of less than 180° for convenience of injection molding, and the antenna unit 50 and the charging unit 60 cannot form 360°, resulting in a gap around the outer periphery. In order to fill the gap and form a 360° annular member with the outer cover member 52 and the outer cover member 62 as a whole, two small cover members 70 are assembled between the ends of both to completely cover the outer periphery. In this example, the small cover member 70 made of aluminum alloy is adopted in consideration of strength, lightness, workability and decorativeness.

Here, six connecting shaft members 21a are arranged on the upper surface of the flange portion 13 of the chuck portion 11. The connecting shaft members 21a are inserted into the connecting holes 19c (see FIG. 2) drilled in the lower end 19a of the shank connecting portion 19 of the shank portion 12, thereby connecting the chuck portion 11 to the shank portion 12. A pair of connecting shaft members 21a arranged at a position rotated approximately 90° from the antenna hole 57 and the charging cable hole 67 are fitted and inserted with approximately annular keys 71. Each of the keys 71 is provided with a protrusion 71a that protrudes radially outward. In addition, a fitting recess 70a is provided on the radial inner surface of the small cover member 70, and the protrusion 71a of each key 71 is fitted into the fitting recess 70a to be positioned. Therefore, when the small cover member 70 is assembled between the outer cover members 52, 62, the positioning of the outer cover members 52, 62 in the rotational direction can be achieved by the small cover member 70, and the small cover member 70 can absorb fatigue caused by repeated deceleration and acceleration during high-speed rotation, thereby preventing fatigue failure of the resin outer cover members 52, 62. Note that, taking into consideration the thickness of the key 71, a recess 19C is provided in the corresponding connecting hole 19b of the shank side connecting part 19 so as to have a different height from the others.

2 and 4, the annular cover 26 is inserted around the nut connecting portion 24 from below with the outer cover members 52, 62 and the small cover member 70 assembled to the chuck portion 11. The annular cover 26 and the flange portion 13 have four through holes 26a and connecting holes 13a at approximately equal intervals in the rotational direction at positions where they can be seen from each other, and when the annular cover 26 is attached to the flange portion 13, fixing screws 27 are inserted into the through holes 26a and connecting holes 13a to fix them. Furthermore, as shown in FIGS. 2 and 3, the outer peripheral edge portion 19d of the flange portion 19 of the chuck portion 11 protrudes downward (hangs down), and the outer peripheral edge portion 26b of the annular cover 26 protrudes upward (stands up). Therefore, when the chuck portion 11 and the annular cover 26 are connected to the shank portion 12, the outer peripheral edges 19d and 26b engage with the upper and lower edges 52c, 62c of the outer cover members 52, 62 (and the small cover member 70) to prevent fixation and loosening in the vertical direction.

<Temperature sensor unit structure>
Next, the temperature sensor unit 35 will be described.
1 shows a cross-sectional view of the tool holder unit 10 without the collet 28, the nut 29, and the rotating tool 72, while FIG. 19 shows a cross-sectional view of the tool holder unit 10 with the collet 28, the nut 29, and the rotating tool 72 (hereinafter also referred to as "rotating tool 72"). For convenience of explanation of the temperature sensor unit 35, FIG. 19 will be mainly referred to. Also, FIG. 20 is a vertical cross-sectional view of the temperature sensor unit 35, where (a) shows the state when not compressed, and (b) shows the state when compressed. FIG. 21 shows the vicinity of the movable substrate 35c in the cylindrical main body 35b of the temperature sensor unit 35, where (a) is a partially transparent perspective view, and (b) is a partial cross-sectional view. 22(a) shows an exploded perspective assembly view of the temperature sensor unit 35 and the tool holder unit 10 seen from below without the collet 28, the nut 29 and the rotating tool 72, and (b) and (c) show transparent perspective views of the temperature sensor unit 35 seen from obliquely above and below, respectively. Furthermore, Fig. 23 is a partial cross-sectional view of the vicinity of the temperature sensor unit 35 of the tool holder unit 10, and for convenience of explanation, the internal structure of the temperature sensor unit 35 is shown in perspective.

The temperature sensor unit 35 is composed of a generally hollow cylindrical main body 25b, a flange portion 35a forming an annular flange at its base, a thermocouple 75 (covered with a sheath 73) having one end electrically connected to a movable substrate 35c inside the cylindrical main body 25b and the other end inserted and fixed at a temperature measurement location in the rotating tool 72, a screw portion 35d protruding downward from the flange portion 35a and having a through hole therein, a terminal substrate 35e abutting and fixed to the top surface (upper surface) of the cylindrical main body 25b and electrically connecting with the movable substrate 35c, a pin member 35f as a guide element for moving the movable member 35c toward and away from the terminal substrate 35d, and a coil spring 35g arranged around the pin member 35f and electrically connecting the movable substrate 35c and the terminal substrate 35e while generating a reaction force between them.

As shown in FIG. 19, the tool holder unit 10 connects the tip of a thermocouple 75 extending from a temperature measurement point inside the rotating tool 72 held by a collet 28 arranged inside the nut connection portion 24 to an electronic component on an electronic board (in this example, the second electronic board 33), and the thermocouple 75 is connected to the second electronic board 33 via a temperature sensor unit 35.

First, the bottom 14a of the recessed space 14 of the chuck part 11 on which the electronic board unit 30 is mounted and fixed, the board mounting base 31, and the center of the first electronic board 32e are provided with through holes 14c, 31c, and 32e for the temperature sensor unit (the aforementioned through hole 32e). The cylindrical main body part 35b of the temperature sensor unit 35 is inserted from the lower inside of the nut connecting part 24, and the upper end protrudes through the through holes 14c, 31c, and 32e for the temperature sensor unit to the vicinity of the lower surface of the second electronic board 33 in the recessed space 14. At this time, the flange part 35a at the base of the cylindrical main body part 35b acts as an upward stopper and abuts against the bottom part 14a of the recessed space 14.

20 and 21, the inside of the cylindrical main body 35b has a cylindrical space, and the upper surface forms a lid member that closes the upper part of the internal space, and a disk-shaped terminal board 35e is attached to the second electronic board 33 as an electrical contact. As shown in FIG. 22(b), the terminal board 35e has a conductive part 35h that serves as an electrical contact formed in a ring shape concentric with the axis center. This allows the temperature sensor unit 35 to be electrically connected to the second electronic board 33 regardless of the angle at which it is disposed. The internal space of the cylindrical main body 35b is connected in the vertical direction from its bottom to the terminal board 35 by a pin member 35f. As shown in FIG. 21, the movable board 35c is attached to the pin member 35f so as to be slidable up and down, and a coil spring 35g made of a conductive material such as metal is disposed around the pin member 35f between the movable board 35c and the terminal board 35e. Therefore, when a force is applied upward on the movable substrate 35e from below, the coil spring 35g is compressed (see Figure 20(b)), and when the upward force is removed (or when an upward force is applied), the coil spring 35g expands and moves to the movable member 35e, returning to its original position (or moving to a lower position (see Figure 20(a))).

The vertical movement of the movable substrate 35c is achieved by following the advancement and retreat of the pipe member 74. The pipe member 74 is a tubular member, the tip of which is inserted and fixed from below the movable substrate 35c and protrudes upward, and passes downward through a through hole in the screw portion 35d, with the lower end being inserted and fixed into the rotating tool 72. Therefore, when the pipe member 74 connected to the rotating tool 72 is pushed upward, the movable substrate 35c linked thereto is pushed up along the pin member 35f against the repulsive force of the coil spring 35g, and conversely, when the pipe member 74 is pulled downward, the movable substrate 35c is pulled down along the pin member 35f.

In addition, a thermocouple 75 (including its wire) is inserted inside the pipe member 74 along the entire length, and both ends of the thermocouple 75 protrude from the pipe member 74. As shown in Figures 19 and 20, the upper end of the thermocouple 75 protrudes from the pipe member 74 protruding from the movable substrate 35c, and this upper end is electrically connected to the conductive part 35j (thin film, etc.) of the movable substrate 35c by the connecting wire 35i. The conductive part 35j is electrically connected to the lower end of the coil spring 35g, and the upper end of the coil spring 35g is connected to the conductive part 35h of the terminal substrate 35e. As a result, even if the rotating tool 72 moves up and down due to the tightening condition of the nut 29 and the collet 28 (see the arrow in Figure 10), the thermocouple 75, the sheath 73, and the pipe member 74 do not buckle between the chuck part 11.

As described above, the conductive portion 35h of the terminal board 35e is formed by a central circle and its concentric rings, and this conductive portion 35h is electrically connected to a connection terminal arranged on the underside of the third electronic board 33.

<Internal oil supply flow path and leakage/intrusion prevention structure>
FIG. 24 shows a schematic cross-sectional view of a tool holder unit 10 in the case where a passage for cooling oil (hereinafter also referred to as "coolant") is provided inside. In this tool holder unit 10, the coolant is discharged from the tip (lower end) of the rotating tool 72 through the shank part 12, the chuck part 11, and the internal passage of the rotating tool 71 from the spindle of the processing device (see arrows A to F). First, the coolant flows into a main passage 80 connected to a coolant passage (not shown) of the spindle (see arrow A). The main passage 80 is drilled downward along the rotation axis from the upper end of the shank part 12. The coolant that has passed through the main passage 80 flows into a plurality of first passages 81 that extend radially from the main passage 80 in the outer circumferential direction (see arrows B). The first passages 81 are created by drilling from the outside to the inside in the radial direction to the main passage 80, and are sealed from the outside by a set screw 85.

The coolant that flows through the first flow passage 81 to the radial outside (near the set screw 85) due to the pressure in the forward direction and the centrifugal force caused by the rotation flows into the second flow passage 82 that communicates with the first flow passage 81 (see arrow C). The second flow passage 82 is formed by bending downward on the radial outside of each first flow passage 81, and extends downward through the thick interior of the shank side connecting part 19 of the shank part 12 to its bottom 19a. As shown in FIG. 2, the second flow passage 82 is created by drilling the thick interior from the bottom 19a side of the shank side connecting part 19 to the first flow passage 81. At the bottom 19a, a countersink is formed around the outlet 82a of the second flow passage 82, and an O-ring 82b is attached with a thickness that protrudes outward when attached to the countersink. As a result, when the shank portion 12 is connected to the chuck portion 11, leakage of coolant between the inlet of the third flow path 83 can be prevented simply by pressing the shank portion 12 against the upper surface of the chuck side connecting portion 21.

The coolant that flows through the second flow path 82 flows into the third flow path 83 that is fluidly connected to the second flow path 82. The third flow path 83 extends downward in the thickness direction inside the flange portion 13 of the chuck portion 11 and connects to the fourth flow path 84 below the flange portion 13. The fourth flow path 84 bends radially inward at the lower end of the third flow path 83, and four of them extend radially toward the center (see arrow D). The fourth flow path 84 is drilled from the outside to the inside in the radial direction and is sealed from the outside with a set screw 86. In addition, the third flow path 83 is created by drilling from the upper part of the flange portion 13 to the fourth flow path 84 with the fourth flow path 84 drilled. The coolant that has reached the fourth flow passage 84 then flows into a space 88 below a plate nut (see FIG. 22(a)) that supports the flange portion 35a of the temperature sensor unit 35, flows into the spiral flow passage 72b in the rotating tool 71 (see arrow E), and is discharged from the lower end of the rotating tool 72 (see arrow F). An annular O-ring 87 is interposed between the flange portion 35a of the temperature sensor unit 35 and the bottom 14a of the recessed space 14. Taking into consideration the ease of installation and the reduction in the overall length of the tool holder unit 10, an O-ring 87 that can be fixed flat is used.

Furthermore, the partial cross-sectional view of FIG. 25 shows a structure for preventing coolant from entering the temperature sensor unit 35. As described above, the temperature sensor unit 35 has the thermocouple 75 (and the sheath 73 and the pipe member 74) slidably inserted into the through hole 35m inside the threaded portion 35d, and its upper end protrudes into the inside of the cylindrical main body portion 35b. Therefore, it is necessary to prevent coolant from entering the inside of the cylindrical main body portion 35b from the through hole 35m of the threaded portion 35d. In this temperature sensor unit 35, an annular O-ring 80, a washer 81, and an O-ring 82 are arranged in the through hole 35m through which the pipe member 74 passes. By sandwiching the metal washer 81 between the resin O-rings 80 and 82, the pipe member 74 slides up and down, and the O-ring is prevented from deforming in the through hole 35m, thereby preventing a reduction in the sealing effect.

<Weight balance adjustment structure>
In addition, in the above description of the coolant flow paths 80 to 84, the set screws 85 and 86 arranged at the radial ends of the first flow path 81 and the fourth flow path 84 to prevent leakage of the internal coolant were mentioned, but in this tool holder unit, in addition to the set screws 85 and 86, a set screw 96 for adjusting the weight is also provided. The tool holder unit 10 rotates at high speed, and if the radial weight balance is biased, it will cause extra vibration and stress, leading to a decrease in accuracy as a measuring device. In this tool holder unit 10, the set screw 96 is used as an adjustment element for the weight balance. FIG. 26 shows, as an example, a schematic cross-sectional view of the shank portion 12 cut horizontally at the height of the set screw 96 (see FIG. 2, reference numeral 96). As shown in FIG. 26 (and FIG. 2), a screw hole 95 into which the set screw 96 can be inserted and fastened is drilled on the outer periphery of the shank portion 12. In this example, four screw holes 95 are provided at 90° intervals. This is to adjust the weight balance in the XY direction.

Figure 26(a) shows an example where the weight is unbalanced in the XY direction when no set screw is inserted (left), and steel set screws 96a-96d (Φ=M5, density 7.9 g/cm2) of different lengths are inserted into the screw holes 96a-96d to adjust the weight balance in the XY direction (right). Figure 26(b) shows an example where the same steel set screws 96a-96c as in Figure 26(a) but of different lengths are inserted into the screw holes 96a-96c, and the weight balance in the Y direction can be adjusted, but the left side is still heavier than the right side, and the weight balance in the X direction cannot be adjusted with the set screw 96 alone (left). In such a case, as shown in the right figure, the lighter set screw 96b on the right side is temporarily removed and a set screw 97 (Φ=M5, density 14.5 g/cm2) made of cemented carbide, which is heavier than the set screw 96b, is inserted to adjust the weight balance in the X direction. Also, even if the set screw 96b is not removed, if the set screw 96 is originally made hollow, it is possible to adjust the weight by increasing the density by inserting a round bar of cemented carbide therein.

The above describes examples of the configuration (examples of components) of the tool holder unit of the present invention, but it will be clear to those skilled in the art that there are various modifications and improvements that use the technical ideas of the present invention.

10...tool holder unit 11...chuck portion 12...shank portion 13...flange portion 13a...connecting hole 14...recessed space 14a...bottom portion 14b...inner wall 14c...through hole for temperature sensor unit 15...tapered portion 16...tapered recess 17...hollow space 19...shank side connecting portion 19a...lower end 19b...connecting hole 19c...recess 19d...outer peripheral edge portion 20...flange portion 21...chuck side connecting portion 21a...connecting shaft member 24...nut connecting Connection portion 25... flange portion 26... annular cover 26a... connection hole 26b... outer peripheral edge portion 27... fixing screw 27a... screw hole 28... collet 29... nut 30... electronic board unit 31... board mounting base 31a... bottom portion 31b... side portion 31c... through hole for temperature sensor unit 31d... notch portion 31e... screw hole 31f... counterbore 31g... pin receiving hole 31h... edge portion 31i... support base 32... first electronic board (lowest electronic board)
32d: Notch 32e: Through hole 32g: Pin receiving hole 33: Second electronic board (below the upper electronic board)
33d: Notch 33e: Through hole 33g: Pin receiving hole 34: Third electronic board (above the upper electronic board)
34d...notch portion 34e...through hole 35...temperature sensor unit 35a...flange portion 35b...cylindrical main body portion 35c...movable board 35d...screw portion 35e...terminal board 35f...pin member 35g...coil spring 35h...conductive portion 35i...connecting wire 35j...conductive portion 35m...through hole 36...spacer 37...board fixing screw 38...power terminal 41...battery unit 41a...battery 41b...electrode 41c...frame member 41d...projection 42...battery unit holder 42a...countersink 42b...through hole 42c...protrusion 42d...recess 42e...semi-through hole 43...battery unit Pressing member 50...antenna unit 51...antenna cable 52...outer cover member 52a...receiving surface 52b...recess 52c...edge 52d...notch 53...substrate antenna 53a...thick portion 54...inner cover member 54a...recess 54b...projection 55...connector 56...fitting boss 56a...through hole 56b...annular groove 57...antenna hole 60...charging unit 61...charging cable 62...outer cover member 62a...receiving surface 62b...recess 62c...edge 62d...through hole 63...charging terminal substrate 63a...through hole 64...inner cover member 65...connector 66...fitting boss (boss)
66a...through hole 66b...annular groove 67...hole for charging cable 68...charging terminal 68a...head 70...small cover member 70a...fitting recess 71...key (key member)
71a: Protrusion 72: Rotary tool
72a...Through hole (semi-through hole)
72b...flow path (fourth flow path)
73: Sheath 74: Pipe member (tubular member)
75... Thermocouple (including its wire)
76...Plate nut 80...Main flow path 81...First flow path 82...Second flow path 82a...Outlet 82b...O-ring 83...Third flow path 84...Fourth flow path 85...Setting screw 86...Setting screw 87...O-ring 88...Space 90...O-ring 91...Washer 92...O-ring 95 (95a to 95d)...Screw hole 96 (96a to 96d)...Setting screw 97...Round bar set screw (set screw)

Claims (11)

A substantially cylindrical tool holder unit that detects temperature information and/or vibration information of a rotary tool during processing by a rotary processing device in real time and transmits the information wirelessly to an outside,
the tool holder unit holds a rotary tool at a lower chuck portion side and is held by a spindle of a rotary processing device at an upper shank portion side, and includes an electronic board unit that is mounted in an internal space and receives and transmits at least temperature information and/or vibration information of the rotary tool, and an antenna unit that receives the temperature information and/or vibration information from the electronic board unit via an antenna cable and wirelessly transmits the information to the outside,
the antenna unit is attached to the outer periphery of the tool holder unit in a state where the inside is sealed from the outside ,
an outer cover member made of an insulating material having radio wave permeability, the outer cover member having a radially outer surface that forms a semicircular arc shape continuous with an outer peripheral surface of the tool holder unit;
an inner cover member attached to the outer cover member from the radially inner side to form a semicircular arc shape;
a substrate antenna, which is a flexible, generally plate-like member that connects, at its radially inner surface, an end of an antenna cable that is passed from the radially inner side to the radially outer side of the inner cover member, and which is sealed and attached within a gap between the inner cover member and the outer cover member when attached to the radially outer side of the inner cover member;
having
the inner cover member has a recess on its radially outer surface that abuts against and receives the radially inner surface of the substrate antenna, and a protrusion protruding from an upper edge portion;
the substrate antenna has a radially inner side that is abutted against and received in the recess of the inner cover member, and a circumferential portion that has a thick portion that is thicker radially outward;
the outer cover member has a frame member standing radially inward along an upper edge portion and a lower edge portion, a receiving surface that abuts and receives the radially outer side of the board antenna on the radially inner side between the top and bottom of the frame member, a notch portion that is a part of the frame member and that fits and receives a protrusion of the inner cover member, and a recess that fits and receives a thick portion of the board antenna,
a tool holder unit in which, with a substrate antenna received and fixed in a recess of the inner cover member, a protrusion of the inner cover member and a thick portion of the substrate antenna are fitted into a cutout portion and a recess of the outer cover member, respectively, to adhesively fix the inner cover member and the outer cover member . A substantially cylindrical tool holder unit that detects temperature information and/or vibration information of a rotary tool during processing by a rotary processing device in real time and transmits the information wirelessly to an outside,
the tool holder unit holds a rotary tool at a lower chuck portion side and is held by a spindle of a rotary processing device at an upper shank portion side, and includes an electronic board unit that is mounted in an internal space and receives and transmits at least temperature information and/or vibration information of the rotary tool, and an antenna unit that receives the temperature information and/or vibration information from the electronic board unit via an antenna cable and wirelessly transmits the information to the outside,
the antenna unit is attached to the outer periphery of the tool holder unit in a state where the inside is sealed from the outside ,
an outer cover member made of an insulating material having radio wave permeability, the outer cover member having a radially outer surface that forms a semicircular arc shape continuous with an outer peripheral surface of the tool holder unit;
an inner cover member attached to the outer cover member from the radially inner side to form a semicircular arc shape;
a substrate antenna, which is a flexible, generally plate-like member that connects, at its radially inner surface, an end of an antenna cable that is passed from the radially inner side to the radially outer side of the inner cover member, and which is sealed and attached within a gap between the inner cover member and the outer cover member when attached to the radially outer side of the inner cover member;
having
a tool holder unit for mounting the electronic board unit, the tool holder unit having an internal space communicating with the outside;
A generally cylindrical boss having a through hole penetrating from inside to outside and an annular groove along an outer periphery protrudes from the radially inner side of the inner cover member and is inserted and fixed into the antenna hole,
the antenna cable is attached to the board antenna through a through hole of the boss inserted and fixed to the antenna hole from the electronic board unit,
a tool holder unit , wherein an O-ring is disposed between an inner wall of the antenna hole and the annular groove of the boss, and an adhesive is filled between the through hole of the boss and the antenna cable . A substantially cylindrical tool holder unit that detects temperature information and/or vibration information of a rotary tool during processing by a rotary processing device in real time and transmits the information wirelessly to an outside,
the tool holder unit holds a rotary tool at a lower chuck portion side and is held by a spindle of a rotary processing device at an upper shank portion side, and includes an electronic board unit that is mounted in an internal space and receives and transmits at least temperature information and/or vibration information of the rotary tool, and an antenna unit that receives the temperature information and/or vibration information from the electronic board unit via an antenna cable and wirelessly transmits the information to the outside,
the antenna unit is attached to the outer periphery of the tool holder unit in a state where the inside is sealed from the outside,
an outer cover member made of an insulating material having radio wave permeability, the outer cover member having a radially outer surface that forms a semicircular arc shape continuous with an outer peripheral surface of the tool holder unit;
an inner cover member attached to the outer cover member from the radially inner side to form a semicircular arc shape;
a substrate antenna, which is a flexible, generally plate-like member that connects, at its radially inner surface, an end of an antenna cable that is passed from the radially inner side to the radially outer side of the inner cover member, and which is sealed and attached within a gap between the inner cover member and the outer cover member when attached to the radially outer side of the inner cover member;
having
The charging unit is attached to the tool holder unit so as to form an outer peripheral surface of the tool holder unit on the same horizontal plane as the antenna unit, the charging unit comprising:
a charging cable connected to a battery that is connected to the electronic board unit and supplies power thereto, and the charging cable is connected to the battery and supplies power thereto for charging the battery;
an outer cover member made of an insulating material, the outer surface of which in the radial direction is continuous with the outer peripheral surface of the tool holder unit and forms a semicircular arc shape having the same curvature as the antenna unit;
an inner cover member having a semicircular arc shape and attached to the outer cover member from the radially inner side;
a terminal board that is a generally plate-shaped member that connects an end of a charging cable that is passed from the radially inner side to the radially outer side of the inner cover member, and is attached and fixed to the radially inner side of the outer cover member by a fixing screw;
The tip of the fixing screw is exposed to the outside from the outer cover member and serves as an electric terminal for receiving power from the outside . The inner cover member has a radially outer surface that abuts against and receives a radially inner surface of the terminal board,
the outer cover member has a frame member that stands radially inward along an upper edge portion and a lower edge portion, and a recess that receives the terminal board, the recess having a through hole into which the fixing screw can be inserted,
the terminal board has a shape to be fitted into the recess of the outer cover member, and has a through hole at a position where the through hole through which the fixing screw can be inserted is visible when the terminal board is fitted into the recess of the outer cover member;
4. The tool holder unit according to claim 3, wherein the fixing screw has a large-diameter head and a cylindrical portion having a smaller diameter than the head and extending radially inward, and the terminal board is fixed to the outer cover member by inserting and fixing the small-diameter cylindrical portion from the radially inside into the through hole of the terminal board and the through hole of the outer cover member while the terminal board is fitted and received in a recess of the outer cover member. a charging cable hole that communicates from an internal space of a tool holder unit to the outside,
A substantially cylindrical boss having a through hole penetrating the inside from the inside to the outside and an annular groove along an outer periphery protrudes from the radially inside of the inner cover member and is inserted and fixed into the charging cable hole;
the charging cable is attached to the terminal board through a through hole of the boss that is inserted and fixed to the charging cable hole from the battery,
5. The tool holder unit according to claim 4 , wherein an O-ring is disposed between an inner wall of the charging cable hole and the annular groove of the boss, and an adhesive is filled between the through hole of the boss and the charging cable. the outer cover member of the antenna unit and the outer cover member of the charging unit are injection molded resin bodies, each having a semicircular arc shape of less than 180°, and their ends are connected to each other by a small metal cover member to form an outer peripheral surface of the tool holder unit, and the small cover member is provided with a fitting recess penetrating therethrough in the radial direction;
a key member that is connected to a tool holder unit on a radially inner side of the inner cover member of the antenna unit and the inner cover member of the charging unit, and has a projection that projects radially outward;
A tool holder unit according to any one of claims 3 to 5, wherein when each small cover member is connected to both ends of the outer cover member of the antenna unit and the outer cover member of the charging unit , the antenna unit and the charging unit are positioned in the rotational direction by inserting a protrusion of the key member into a recess of the small cover member. a pair of screw holes of the same diameter drilled radially on both sides in an X direction and a pair of screw holes of the same diameter drilled radially on both sides in a Y direction on a plane horizontal to a rotation axis,
7. The tool holder unit according to claim 1, further comprising: preparing set screws of the same diameter and the same or different lengths that can be inserted into the respective screw holes and screw-fastened; inserting the set screws into the respective screw holes and screwing them together to adjust the weight balance of the tool holder unit in the X and Y directions. 8. The tool holder unit according to claim 7, wherein the set screw has a through hole or a semi-through hole in a central axial direction, a rod member insertable into the through hole or the semi-through hole is prepared, and the rod member is inserted and fixed into the through hole or the semi-through hole of the set screw fastened to the screw hole . The tool holder unit according to any one of claims 1 to 8 , further comprising a temperature sensor unit that electrically connects the electronic board unit and a thermocouple in a rotary tool, the temperature sensor unit comprising:
A hollow cylindrical main body portion;
a flange portion provided at a bottom of the cylindrical main body portion and having a flange portion protruding radially outward and attached below the bottom portion;
a terminal board that closes an upper portion of the cylindrical main body;
a movable substrate that slides vertically between a bottom of the cylindrical main body and the terminal substrate within the cylindrical main body and electrically connects to an upper end of a wire from a thermocouple within the rotary tool;
a spring member made of a conductive material that is disposed between the movable substrate and the terminal substrate to apply an elastic force in a vertical direction to both of them and electrically connect them to each other;
a tubular member into which a wire from a thermocouple in a rotary tool is inserted, the upper end of which is connected to the movable substrate and the lower end of which is connected to the inside of the rotary tool;
A tool holder unit comprising: 10. The tool holder unit according to claim 9, wherein the temperature sensor unit has a threaded portion protruding downward from the flange portion and screwed to the tool holder unit, the threaded portion, the flange portion and a bottom portion of the cylindrical main body have a through hole penetrating from below to an inside of the cylindrical main body, the inside of the cylindrical main body has a pin member connecting in the vertical direction from the bottom to a terminal board, the spring member is a coil spring slidably wound around the pin member and disposed from the movable board to the terminal board, and the tubular member is inserted slidably in the vertical direction with a through hole penetrating from below to the inside of the cylindrical main body sealed by a sealing means . the sealing means being an annular O-ring made of elastic material and an annular washer made of metallic material, each disposed around the outer periphery of the tubular member through a central hole;
The two O-rings are each elastically intimately contacted with the inner wall of the through hole inside the threaded portion and the outer circumferential surface of the tubular member at their outer circumferential edges and the inner wall of the central hole,
The tool holder unit according to claim 10 , wherein the washer is interposed between two O-rings in the vertical direction.