JP7621582B2 - Split type tool holder unit - Google Patents

Description

The present invention relates to the structure of a roughly cylindrical split 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, the evaluation of the condition of the tool during processing, such as evaluation of wear, fatigue, breakage, and chatter, is required in consideration of 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.).

However, in the case of conventional tool holders, the shank portion that connects to the spindle of the rotary processing device and the chuck portion that grips the rotary tool are integrated. In the case of this integrated tool holder, in order to place an electronic board inside, it is necessary to insert and place it from the lower side of the chuck portion with the collet removed, and it is necessary to assemble the electronic board and electronic components upward in a narrow space, which makes the assembly process complicated and time-consuming. In addition, since the shank side of the tool holder is determined according to the spindle of the predetermined (standard) rotary processing device, it is not possible to change the diameter or shape of the shank side. As a result, it is not possible to improve the efficiency of the arrangement of electronic boards and electronic components, or to ensure the arrangement space of the electronic boards, etc.

Therefore, methods of splitting the tool holder unit into two parts (split type) have been considered, but a split type could reduce the strength of the tool holder unit, which rotates at high speed, and could generate excess vibration. In addition, the tool holder unit is held by a general-purpose spindle, and since it is located in close proximity to peripheral equipment, it is necessary to avoid the folly of making it larger in order to prioritize strength. Furthermore, even if the tool holder unit is simply split, it cannot be said that space for installing electronic boards and the like is secured and workability is improved.

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 tool holder unit that can be attached to the spindle of a rotary processing device and measure the temperature, vibration, etc. of a rotating tool in real time, which has a split structure yet can be made the same size (total length) as or smaller than a general tool holder, while at the same time improving the ease of assembly of electronic boards, etc., and maintaining strength.

Divided structure and electronic board unit Specifically, the present invention provides:
A substantially cylindrical split tool holder unit that detects in real time at least a temperature and/or a vibration of a rotary tool during processing by a rotary processing device,
The split type tool holder unit has a chuck portion that grips a rotary tool at a lower portion, and a shank portion that is connected to an upper portion of the chuck portion at a lower portion and is gripped by a spindle of a rotary processing device at an upper portion, the shank portion being connected to an upper portion of the chuck portion at a lower portion, the shank portion being connected to an upper portion of the chuck portion at a lower portion,
The chuck portion has an annular flange portion that protrudes around the outer periphery at a vertical intermediate position, and a chuck side connecting portion that forms a tapered portion that reduces in diameter upward from the flange portion and has a cylindrical recessed space therein,
the shank portion has a shank-side connecting portion having a tapered recess that expands in diameter downward therein, and the tapered portion of the chuck-side connecting portion can be inserted into the tapered recess in a nested manner;
An insulating electronic board unit is inserted and fixed in the recessed space of the chuck portion, which receives the temperature and/or vibration of the rotary tool.

The split tool holder unit of the present invention is constructed in two parts, a chuck portion and a shank portion. Therefore, after an insulated electronic board unit is inserted from above into the cylindrical recessed space provided above the chuck portion and fixed, the shank portion is connected. This eliminates the need to insert the electronic board into the internal space from the chuck side of the small working space as with conventional integrated tool holder units, greatly improving ease of assembly.

In addition, the chuck and shank are joined by inserting (pressing) the tapered chuck side connecting part into the shank side connecting part, which has a tapered recess that widens at the end, in a nested manner, making it easy to ensure space above and below to accommodate the electric board unit while maintaining high rigidity in the radial direction. This also contributes to shortening the overall length of the tool holder as a whole, preventing the occurrence of unnecessary vibrations and amplification, and enabling the tool holder unit to have high sensitivity and precision as a temperature and vibration detection device.

Furthermore, with this split tool holder unit, the shank portion is nested over the chuck portion and the lower end of the shank portion is abutted against the flange portion of the chuck portion to join them, improving rigidity and ease of assembly in the vertical direction. Even if there is an intercoolant passage inside, it is easy to position the passage by splitting it.

Further, the electronic board unit includes a substantially disk-shaped board attachment base that is placed and fixed to a bottom of the cylindrical recessed space of the chuck portion, a substantially disk-shaped bottom-layer electronic board that has a bottom surface placed and fixed on the board attachment base, and one or more substantially disk-shaped upper-layer electronic boards that are stacked at a distance from the bottom-layer electronic board, each of the substantially disk-shaped board attachment base being made of an insulating material;
a distance between each of the lowermost electronic substrate and the uppermost electronic substrate is formed by a substantially cylindrical spacer made of a conductive material, the spacer standing on a through hole provided in an outer peripheral edge of each of the electronic substrates , the outer peripheral surface of the spacer being offset inwardly from the electronic substrates in the standing state ;
It is preferable that the through hole of the lowermost electronic board be aligned in phase with the through hole of the uppermost electronic board, the inner diameter hole of the spacer which provides a distance between them, and the screw hole provided in the board mounting base, so that they can be seen into each other, and that each electronic board is fixed onto the board mounting base by a fixing screw made of a conductive material which passes through the respective hole from the through hole of the uppermost electronic board and has its tip fastened to the screw hole of the board mounting base.

In this example of a split tool holder, first, a board mounting base made of insulating material is inserted and placed at the bottom of the recessed space on the chuck side as the mounting space for the electronic board, and the gap between the bottom and the inner wall of the recessed space is fixed with adhesive or the like. In this example, as described below, the electronic boards are stacked and fixed to the tool holder with fixing screws made of metal or the like, so in order to insulate the electronic boards from the tool holder and the fixing screws, a board mounting base made of resin or the like that is similar to the inner diameter of the board is fixed to the bottom of the recessed space, and a fastening partner when fastening the electronic boards with the fixing screws can be created by a simple insertion and adhesive process while ensuring insulation. In addition, in this example, multiple electronic boards can be easily stacked on the board mounting base while ensuring insulation by sandwiching a spacer between them, and the vertical direction can be connected at once with the fixing screws, making assembly easy. In addition, since the spacer and the fixing screws that pass through them are made of conductive materials such as metal, it is possible to electrically connect each electronic board at the same time as assembling the electronic boards (insulated from the tool holder).

Furthermore, electronic circuit boards can become unable to function properly if they become too hot, but in this example, by placing a circuit board mounting base made of resin or other material with low thermal conductivity at the bottom of the recessed space, it is possible to protect the electronic circuit board from the tool holder, which is made of metal and has high thermal conductivity.

As a specific example of the split type tool holder unit, an upper part of a temperature sensor unit connected to a thermocouple in the rotary tool protrudes from below at a bottom of the recessed space of the chuck portion, and the temperature sensor unit is provided with a flange portion on its outer periphery,
The substrate mounting base is provided with a through hole for the temperature sensor unit at the center of the rotation axis and a notch at a position approximately symmetrical in the radial direction on the outer periphery, and a counterbore recessed downward is formed on the upper surface,
At least the bottom electronic board has a center hole at the center of the rotation axis, the center hole being exposed to the through hole for the temperature sensor unit,
When the temperature sensor unit is placed and fixed to the bottom of the recessed space, when the flange portion is fixed to the chuck portion from below, the upper portion of the temperature sensor unit is inserted into the temperature sensor unit through hole and the central hole, and the tip thereof protrudes upward.

In this split tool holder unit, the temperature sensor unit is fixed to the chuck section from below by its flange section with screws or the like, and its upper part is connected to the electronic board through a through hole for the temperature sensor unit in the center of the board mounting base placed and fixed to the bottom of the recessed space. At this time, at least a through hole (center hole) is provided in the lowest electronic board. It is configured so that the upper end of the temperature sensor unit can pass through. When the temperature sensor unit is provided in the chuck section, it is necessary to give the temperature sensor unit an expandable function in consideration of the length of the rotating tool and the retraction length when gripping the rotating tool. In order to prevent the overall length of the tool holder unit from increasing due to this, the upper part of the temperature sensor unit is inserted into a through hole through which the board mounting base and the electronic board pass. In addition, since a counterbore is provided on the upper surface of the board mounting base, even if the side on which the electronic components of the electronic board on the lowest layer are attached is attached to the board mounting base with the side facing down, the counterbore portion becomes a space to receive the electronic components, further eliminating waste in the vertical direction and shortening the overall length of the tool holder. In addition, a pair of notches is provided symmetrically on the outer periphery of the board mounting base. Conductive wires for connection to an electronic board can be extended downward from each cutout portion and connected to an external antenna or the like.

Battery unit Also, this split type tool holder unit is,
a rechargeable battery unit having an electrode formed of a leaf spring disposed on the underside thereof;
a battery unit holder that can receive and fix the battery unit from above to expose electrodes downward, and can be inserted into a recessed space of the chuck portion to position the battery unit in a rotational direction relative to the electronic board;
a battery unit pressing member that is disposed in contact with an upper surface of the battery unit received and fixed in the battery unit holder and is pressed between the upper surface and a top surface of the tapered recess of the shank portion,
A structure in which a power supply terminal that comes into contact with an electrode of the battery unit is disposed on the upper surface of the uppermost electronic board among the upper electronic boards is also exemplified.

The battery unit pressing member is formed of a substantially disk-shaped insulating elastic member (urethane resin, urethane rubber),
the electronic board on the top layer is provided with a positioning notch on its outer periphery;
The battery unit is substantially disk-shaped and has a protrusion protruding in a radial direction on its outer periphery.
It is preferable that the battery unit holder is formed of an insulating elastic member, has a protrusion on the outer edge of its underside for fitting into a positioning notch on the top layer electronic board to position it in the rotational direction, has a seat groove formed in the center of the bottom having a through hole large enough to insert and receive the battery unit from above and expose the electrodes of the battery unit downward, and has a recess on the inner wall of the seat groove for radially fitting into the protrusion of the battery unit.

According to this split tool holder unit, when power is supplied from a rechargeable battery unit to an electronic board, an electrode is provided on the bottom (lower surface) of the battery unit. The battery units are stacked on top of each other and abutted against the power terminal provided on the surface (upper surface) of the topmost electronic board. The terminals of the battery units are made of a leaf spring, and a battery unit holder made of an elastic material such as urethane foam is placed on top of the battery units and the shank is simply covered to supply power while insulating the electronic board components with the elastic force of the leaf spring and the battery unit holder. In addition, the battery unit can be protected from vibration and impact by abutting the electrode of the battery unit against the power terminal of the topmost electronic board while the battery unit is received in the battery unit holder made of an elastic material. Furthermore, the battery unit, the battery unit holder, and the electronic board can be positioned by being fitted together by the protrusions of the battery unit, the convex parts, countersunk parts, and concave parts of the battery unit holder, and the notch parts of the topmost electronic board, and the battery unit can be held in an appropriate position and posture even in a simple assembly process of stacking from top to bottom.

Internal cooling oil flow path The split tool holder unit further includes a cooling oil flow path that passes from the rotary processing device through the interior to the rotary tool, and the cooling oil flow path includes:
A main flow path that flows downward along a rotation axis from an upper end of the shank portion;
A plurality of first flow paths extending radially outwardly from a lower end of the main flow path in a substantially lateral direction;
a second flow passage extending downward from a radial outer end of each of the first flow passages through the thick wall of the shank side connecting portion to an outlet at a lower end thereof;
a third flow passage having an inlet at a position fluidly continuous with each of the outlets of the second flow passages when the shank portion and the chuck portion are connected, and extending within a thick wall of a flange portion of the chuck portion to a height position below the chuck side connecting portion;
and a fourth flow passage extending generally laterally radially inward from a lower end of each of the third flow passages and exiting above the rotary tool.

Conventional tool holders with functions for measuring temperature, vibration, etc. did not have internal cooling oil passages due to the difficulty of securing space for mounting the electronic board and space for the passages, but with the structure of this split tool holder, the shank side connecting part that is nested and the flange part of the chuck part that supports its bottom have a thick structure, and because the shank part and chuck part are separated, space is secured to install a cooling oil passage and processing from the outside is also simplified, making it possible to form a cooling oil passage through the internal thick part. This not only provides a heat-resistant structure for the electronic board unit, but also makes it possible to cool it with cooling oil, making it possible to process and transmit large volumes of data with high precision.

in particular,
The first flow passage is formed by drilling a hole radially inward from the outer surface of the shank portion at a height position near the lower end of the main flow passage, and the radial outer end of the first flow passage is sealed with a set screw;
The second flow passage is created by drilling upward the thick-walled portion at the lower end of the shank-side connecting portion, and a counterbore is formed at the outlet of the lower end, which is recessed upward, and an O-ring having a thickness that protrudes downward when viewed from the second flow passage is attached to the counterbore,
the third flow passage is formed by drilling downward a thick-walled portion at an upper end of a flange portion of the chuck portion, and when the shank portion is connected to the chuck portion, an O-ring at an inlet at the upper end of the flange portion is pressed against an outlet of the second flow passage, thereby connecting the outlet of the second flow passage and the inlet of the third flow passage in a sealed state;
The fourth flow passage is formed by drilling a hole radially inward from the outer surface of the chuck portion at a height position near the lower end of the third flow passage, and the radial outer end of the fourth flow passage is sealed with a set screw.

In this specific example of an internal cooling oil flow path, the flow path can be easily formed by drilling holes from the outside, as described above, and sufficient sealing can be achieved even in areas where leakage is possible by simply applying locking screws or O-rings.

The split tool holder unit of the present invention, although split, can be easily connected by simply placing the shank portion over the chuck portion in a nested manner and connecting them, and since the area around the recessed space in which the electronic board unit or the like is placed can be made thick, it is possible to achieve a shortened overall length and high strength while ensuring a wide space for placing electronic boards, etc. In addition, since this tool holder unit is structured so that the recessed space in the chuck portion in which the electronic board unit is placed is open upward, the assembly work of the electronic boards, etc. is also made easy.

In addition, with this split tool holder unit, even though it is a split type, the shank side connecting part and the flange part of the chuck part that supports it can be made with a thick structure, leaving space inside to set up a cooling oil flow passage, which is advantageous in that the cooling oil flow passage can be created and sealed simply by drilling holes from the outside while the unit is in the split state.

FIG. 2 is a cross-sectional view of a split tool holder unit of the present invention. FIG. 2 is an exploded perspective view showing a state in which the split type tool holder unit shown in FIG. 1 is split. FIG. 2 is a cross-sectional view showing a state immediately before the split type tool holder unit shown in FIG. 1 is connected. FIG. 2 is a perspective view showing a state in which the split tool holder units shown in FIG. 1 are 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 split tool holder unit shown in FIG. 1 . FIG. FIG. 13 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 split tool holder shown in FIG. 1 , showing 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 a split 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 split 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 split 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 split tool holder unit having a cooling oil passage therein. FIG. 11 is a partial cross-sectional view of a split 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 split tool holder unit in which the shank portion is cut horizontally at the height of the fastening screw.

<Basic structure of split tool holder unit>
Fig. 1 is a cross-sectional view of a split tool holder unit 10 of the present invention (hereinafter also simply referred to as "tool holder unit 10"), Fig. 2 is an exploded perspective assembly view showing a state in which the tool holder unit is split, and Fig. 3 is a cross-sectional view showing a state immediately before the tool holder units are connected. Fig. 4 is a perspective view showing a state in which the split 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 recess 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 tapers 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, the charging unit 60, and the outer cover member 62 are attached to the flange portion 25 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 (see FIG. 1) of the recessed space 14. 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. Furthermore, adhesive is applied to the side 31b of the substrate mounting base 31, and it is 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. Four support stands 31i for the bottom electronic board 31 protruding radially into the countersunk portion 31f and the spacer (described later) fixed thereon are provided at 90° intervals on the rim 31h, 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 on top of the first electronic board 32 in order and glued. 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 in the second electronic board 33 and the third electronic board 34 so as to look into the screw hole 31e, pin receiving hole 31e, and notch 31d of the support base 31i. Note that the notch 34d of the third electronic board 34 is different from the notches 32d, 33d of the other electronic boards 32 to 33 in that four notches 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 installation>
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, a battery unit pressing member 43 is placed on the battery unit holder 42. The battery unit pressing 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 pressing 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 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 showing the vicinity of 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 rotates at high speed and has a large environmental load. 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 is provided on the 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) through which the recessed space 14 of the chuck portion 11 communicates with 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) fitted in 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 with and inserted into the connecting shaft members 21a. 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 connection part 24 from below with the outer cover members 52, 62 and the small cover member 70 assembled to the chuck part 11. The annular cover 26 and the flange part 13 have four through holes 26a and connection 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 part 13, fixing screws 27 are inserted into the through holes 26a and connection holes 13a to fix it. Furthermore, as shown in Figs. 2 and 3, the outer peripheral edge 19d of the flange part 19 of the chuck part 11 protrudes downward (hangs down), and the outer peripheral edge 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 the 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 paths 84 bend radially inward at the lower end of the third flow path 83, and extend radially toward the center in four directions (see arrow D). The fourth flow paths 84 are drilled from the outside to the inside in the radial direction and are sealed from the outside by 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.

We have described above examples of the configuration (examples of components) of the split 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 concepts of the present invention.

10...Split type 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 portion 25... flange portion 26... annular cover 26a... connecting 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...convex portion 42d...concave portion 42e...semi-through hole 43...battery unit pressing member 50...antenna unit 51...antenna cable 52...outside Cover member 52a...receiving surface 52b...recess 52c...edge 52d...notch 53...board 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 board 63a...through hole 64...inner cover member 65...connector 66...fitting boss 66a...through hole 66b...annular groove 67...charging cable hole 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 (6)

A substantially cylindrical split tool holder unit that detects in real time at least a temperature and/or a vibration of a rotary tool during processing by a rotary processing device,
The split type tool holder unit has a chuck portion that grips a rotary tool at a lower portion, and a shank portion that is connected to an upper portion of the chuck portion at a lower portion and is gripped by a spindle of a rotary processing device at an upper portion, the shank portion being connected to an upper portion of the chuck portion at a lower portion, the shank portion being connected to an upper portion of the chuck portion at a lower portion,
The chuck portion has an annular flange portion that protrudes around the outer periphery at a vertical intermediate position, and a chuck side connecting portion that forms a tapered portion that reduces in diameter upward from the flange portion and has a cylindrical recessed space therein,
the shank portion has a shank-side connecting portion having a tapered recess that expands in diameter downward therein, and the tapered portion of the chuck-side connecting portion can be inserted into the tapered recess in a nested manner;
an insulating electronic board unit is inserted and fixed in the recessed space of the chuck portion from the chuck portion which receives the temperature and/or vibration of the rotary tool;
the electronic board unit includes a substantially disk-shaped board mounting base that is mounted and fixed to a bottom of the cylindrical recessed space of the chuck portion, a substantially disk-shaped bottom-layer electronic board that has a bottom surface mounted and fixed to the board mounting base, and one or more substantially disk-shaped upper-layer electronic boards that are stacked at a distance from the bottom-layer electronic board, each of the substantially disk-shaped board mounting base being made of an insulating material;
a distance between each of the lowermost electronic substrate and the uppermost electronic substrate is formed by a substantially cylindrical spacer made of conductive material, the outer peripheral surface of which is offset inwardly from the electronic substrate when the spacer is erected on a through hole provided in an outer peripheral edge of each of the electronic substrates;
a through hole of the lowermost electronic board from a through hole of an uppermost electronic board, an inner diameter hole of the spacer that provides a distance between them, and a screw hole provided in the board mounting base are aligned in phase so that they can see into each other, and each electronic board is fixed onto the board mounting base by a fixing screw made of a conductive material that passes through the respective hole from the through hole of the uppermost electronic board and has its tip fastened to a screw hole of the board mounting base. An upper portion of a temperature sensor unit connected to a thermocouple in the rotary tool protrudes from below at the bottom of the recessed space of the chuck portion, and a flange portion is provided on the outer periphery of the temperature sensor unit.
The substrate mounting base is provided with a through hole for the temperature sensor unit at the center of the rotation axis and a notch at a position approximately symmetrical in the radial direction on the outer periphery, and a counterbore recessed downward is formed on the upper surface,
At least the bottom electronic board has a center hole at the center of the rotation axis, the center hole being exposed to the through hole for the temperature sensor unit,
2. The split tool holder according to claim 1, wherein when the temperature sensor unit is placed and fixed to a bottom of the recessed space, an upper portion of the temperature sensor unit is inserted into the temperature sensor unit through hole and the central hole and a tip of the temperature sensor unit protrudes upward when the flange portion is fixed to the chuck portion from below. a rechargeable battery unit having an electrode formed of a leaf spring disposed on the underside thereof;
a battery unit holder that can receive and fix the battery unit from above to expose electrodes downward, and can be inserted into a recessed space of the chuck portion to position the battery unit in a rotational direction relative to the electronic board;
a battery unit pressing member that is disposed in contact with an upper surface of the battery unit received and fixed in the battery unit holder and is pressed between the upper surface and a top surface of the tapered recess of the shank portion,
2. The split tool holder according to claim 1, wherein a power supply terminal that comes into contact with an electrode of the battery unit is disposed on an upper surface of an uppermost electronic board among the upper electronic boards. The battery unit pressing member is formed of a substantially disk-shaped insulating elastic member,
the electronic board on the top layer is provided with a positioning notch on its outer periphery;
The battery unit is substantially disk-shaped and has a protrusion protruding in a radial direction on its outer periphery.
4. The split tool holder according to claim 3, wherein the battery unit holder is formed of an insulating elastic member, the outer peripheral edge of the lower surface of the battery unit holder is provided with a protrusion for fitting into a positioning notch of the uppermost electronic board to position it in the rotational direction, a seat groove is formed in the center of the bottom surface of the battery unit by inserting the battery unit from above, and the seat groove has a through hole of a size that allows the electrodes of the battery unit to be exposed downward, and a recess is arranged in the inner peripheral wall of the seat groove into which the protrusion of the battery unit fits radially . The split type tool holder unit according to any one of claims 1 to 4, further comprising a cooling oil flow passage for allowing a cooling oil to flow from a rotary processing device through an inside of the unit to a rotary tool, the cooling oil flow passage comprising:
A main flow path that flows downward along a rotation axis from an upper end of the shank portion;
A plurality of first flow paths extending radially outwardly from a lower end of the main flow path in a substantially lateral direction;
a second flow passage extending downward from a radial outer end of each of the first flow passages through the thick wall of the shank side connecting portion to an outlet at a lower end thereof;
a third flow passage having an inlet at a position fluidly continuous with each of the outlets of the second flow passages when the shank portion and the chuck portion are connected, and extending within a thick wall of a flange portion of the chuck portion to a height position below the chuck side connecting portion;
a fourth flow passage extending radially inwardly in a substantially lateral direction from the lower end of each of the third flow passages and flowing out above the rotary tool; The first flow passage is formed by drilling a hole radially inward from the outer surface of the shank portion at a height position near the lower end of the main flow passage, and the radial outer end of the first flow passage is sealed with a set screw;
The second flow passage is created by drilling upward the thick-walled portion at the lower end of the shank-side connecting portion, and a counterbore is formed at the outlet of the lower end, which is recessed upward, and an O-ring having a thickness that protrudes downward when viewed from the second flow passage is attached to the counterbore,
the third flow passage is formed by drilling downward a thick-walled portion at an upper end of a flange portion of the chuck portion, and when the shank portion is connected to the chuck portion, an O-ring at an inlet at the upper end of the flange portion is pressed against an outlet of the second flow passage, thereby connecting the outlet of the second flow passage and the inlet of the third flow passage in a sealed state;
6. The split tool holder unit of claim 5, wherein the fourth passage is drilled radially inward from an outer surface of the chuck portion at a height position near a lower end of the third passage, and a radially outer end of the fourth passage is sealed with a set screw.