Rotary cutting tool

Abstract

This rotary cutting tool is provided with a shaft part, a body part, a battery, and a sensor. The body part is attached to the shaft part. The battery is housed in the internal space of the body part. The sensor is electrically connected to the battery. A vent hole communicating with the internal space is provided in the body part.

Description

Turning tools

[0001] The present disclosure relates to milling tools.

[0002] Japanese Patent Application Laid-Open No. 2018-54611 (Patent Document 1) discloses a milling tool having a battery disposed therein.

[0003] JP 2018-54611 A

[0004] The milling tool according to the present disclosure includes a shaft portion, a main body portion, a battery, and a sensor. The main body portion is attached to the shaft portion. The battery is housed in an internal space of the main body portion. The sensor is electrically connected to the battery. The main body portion is provided with a vent hole communicating with the internal space.

[0005] FIG. 1 is a schematic perspective view of a milling tool according to a first embodiment. FIG. 2 is a schematic bottom view of the milling tool according to the first embodiment. FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. FIG. 4 is a schematic, partially enlarged cross-sectional view of region IV in FIG. 3. FIG. 5 is a schematic cross-sectional view taken along line V-V in FIG. 3. FIG. 6 is a schematic perspective view of a shaft portion to which a cutting portion according to the first embodiment is attached. FIG. 7 is a schematic, partially enlarged cross-sectional view of a milling tool according to a first modified example of the first embodiment. FIG. 8 is a schematic, partially enlarged cross-sectional view of a milling tool according to a second modified example of the first embodiment. FIG. 9 is a schematic, partially enlarged cross-sectional view of a milling tool according to a third modified example of the first embodiment. FIG. 10 is a schematic, partially enlarged cross-sectional view of a vent hole in region X in FIG. 9. FIG. 11 is a schematic, partially enlarged cross-sectional view of a vent hole according to a fourth modified example of the first embodiment. FIG. 12 is a schematic, partially enlarged cross-sectional view of a milling tool according to a fifth modified example of the first embodiment. FIG. 13 is a schematic, partially enlarged cross-sectional view of a milling tool according to a sixth modified example of the first embodiment. Fig. 14 is a schematic cross-sectional view of a milling tool according to a seventh modified example of the first embodiment. Fig. 15 is a schematic perspective view of a milling tool according to a second embodiment.

[0006] [Problem to be Solved by the Present Disclosure] A battery that supplies power to a sensor for determining the state of the milling tool is housed in the internal space of the main body. If the battery is a nickel-metal hydride battery that releases gas, the internal space of the main body will be filled with gas if the internal space of the main body is sealed. Therefore, the gas needs to be vented from the internal space to the outside.

[0007] An object of the present disclosure is to provide a milling tool that can exhaust gas released from a battery to the outside.

[0008] Effect of the Present Disclosure According to the present disclosure, it is possible to provide a milling tool that can exhaust gas released from a battery to the outside.

[0009] [Outline of the embodiment] First, an outline of the embodiment of the present disclosure will be described.

[0010] (1) A milling tool according to the present disclosure includes a shaft portion, a main body portion, a battery, and a sensor. The main body portion is attached to the shaft portion. The battery is housed in an internal space of the main body portion. The sensor is electrically connected to the battery. The main body portion is provided with a vent hole communicating with the internal space.

[0011] According to the milling tool of the present disclosure, gas released from the battery can be exhausted from the internal space of the main body in which the battery is housed to the outside of the main body.

[0012] (2) According to the milling tool of (1) above, the shaft portion may have an attachment portion. A cutting portion for cutting a workpiece may be attached to the attachment portion. The main body portion may have a bottom wall portion. The bottom wall portion may be disposed between the attachment portion and the battery. A vent hole may be provided in the bottom wall portion. This allows gas released from the battery to be exhausted through the bottom wall portion.

[0013] (3) The milling tool according to (2) above may be rotatable around the axis. The lower wall portion may have an inner surface that forms the internal space and an outer surface located opposite the inner surface. A direction perpendicular to the direction in which the axis extends may be defined as the radial direction. The first opening of the vent hole on the outer surface may be positioned farther from the axis in the radial direction than the second opening of the vent hole on the inner surface. This reduces the intrusion of cutting oil into the internal space through the vent hole when machining the workpiece.

[0014] (4) According to the milling tool of (3), the first opening may have a first end closest to the axis in the radial direction. The second opening may have a second end farthest from the axis in the radial direction. The first end may be positioned farther from the axis in the radial direction than the second end. This reduces the intrusion of cutting oil into the internal space through the vent hole during machining of the workpiece.

[0015] (5) According to the milling tool of (1) above, the shaft portion may have an attachment portion. A cutting portion for cutting a workpiece may be attached to the attachment portion. The main body portion may have an upper wall portion, a lower wall portion, and a side wall portion. The lower wall portion may be opposite the upper wall portion. The side wall portion may be connected to the upper wall portion and the lower wall portion. A battery may be disposed between the upper wall portion and the lower wall portion. At least one of the upper wall portion and the side wall portion may have a vent hole. This allows gas released from the battery to be exhausted from the internal space of the main body portion in which the battery is housed to the outside of the main body portion. Furthermore, when machining a workpiece, the intrusion of cutting oil into the internal space through the vent hole is reduced.

[0016] (6) In the milling tool according to any one of (1) to (5) above, the vent hole may be provided in a position facing the battery, thereby enabling efficient exhaust of gas released from the battery from the internal space of the main body in which the battery is housed to the outside of the main body.

[0017] (7) The milling tool according to any one of (1) to (6) above may include a filter that blocks the vent hole. The filter may be impermeable to liquids but permeable to gases. This reduces the intrusion of cutting oil into the internal space through the vent hole during machining of the workpiece.

[0018] [Details of the embodiment] Hereinafter, details of the embodiment of the present disclosure (hereinafter also referred to as the present embodiment) will be described with reference to the drawings. Note that the same or corresponding parts in the following drawings are designated by the same reference numerals, and description thereof will not be repeated.

[0019] First Embodiment <Configuration of Milling Tool> First, a milling tool 100 according to a first embodiment will be described.

[0020] FIG. 1 is a schematic perspective view of a milling tool 100 according to the first embodiment. FIG. 2 is a schematic bottom view of the milling tool 100 according to the first embodiment. FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. FIG. 4 is a schematic enlarged partial cross-sectional view of region IV in FIG. 3. FIG. 5 is a schematic cross-sectional view taken along line V-V in FIG. 3. The milling tool 100 according to the first embodiment has a shaft portion 1, a main body portion 2, a battery 4, a substrate 5, and a sensor 6.

[0021] The shaft portion 1 has a first end surface 11a, a second end surface 11b, and a side surface 11c. The side surface 11c is continuous with the first end surface 11a and the second end surface 11b. The shaft portion 1 extends from the first end surface 11a to the second end surface 11b along the axis A. Here, as shown in FIGS. 2 to 5 , the direction in which the axis A extends from the first end surface 11a to the second end surface 11b is defined as the axial direction Z. The direction perpendicular to the axial direction Z and away from the axis A is defined as the radial direction R. The main body portion 2 is arranged to surround a portion of the side surface 11c in the axial direction Z.

[0022] As shown in Figure 1, the shaft portion 1 has multiple (two in the case of the milling tool 100 according to the first embodiment) mounting portions 9 formed as cutouts on the side surface 11c from the first end face 11a to the second end face 11b.

[0023] As shown in FIG. 2 , the multiple mounting portions 9 are arranged at equal intervals in the circumferential direction around the axis A. The cutting portion 3 is attached to a wall surface forming the mounting portion 9. The cutting portion 3 is, for example, a cutting tip that cuts a workpiece. The milling tool 100 may be a drill, an end mill, or a reamer. The workpiece (not shown) can be machined by rotating the shaft portion 1 around the axis A and bringing the cutting portion 3 into contact with the workpiece. In other words, the milling tool 100 is a cutting tool that can rotate around the axis A.

[0024] <Shaft Portion> Next, the configuration of the shaft portion 1 will be described. FIG. 6 is a schematic perspective view of the shaft portion 1 to which the cutting portion 3 according to the first embodiment is attached. The side surface 11c includes a first region 11c1, a second region 11c2, a third region 11c3, and a fourth region 11c4. The first region 11c1, the second region 11c2, the third region 11c3, and the fourth region 11c4 are arranged in this order from the first end face 11a toward the second end face 11b. The first end face 11a is continuous with the first region 11c1. The second end face 11b is continuous with the fourth region 11c4.

[0025] The shape of the side surface 11c in each of the first region 11c1, the second region 11c2, and the fourth region 11c4 as viewed in the axial direction Z is, for example, circular. As shown in FIG. 5 , the shape of the side surface 11c in the third region 11c3 as viewed in the axial direction Z is, for example, octagonal. The shape of the side surface 11c in the third region 11c3 as viewed in the axial direction Z may be, for example, rectangular, pentagonal, or hexagonal. The outer diameter of the side surface 11c in the second region 11c2 is larger than the outer diameter of the side surface 11c in the first region 11c1.

[0026] As described above, the multiple attachment portions 9 are formed in the first region 11c1. As the cutting portion 3, for example, a cutting tip is mechanically fixed to the shaft portion 1. For example, a male screw may be inserted into a screw hole formed in the cutting tip, and the cutting tip may be fastened by the male screw to fix the cutting tip to the shaft portion 1 (not shown).

[0027] 3 and 4, the lower wall portion 23 is disposed in the second region 11c2. The lower wall portion 23 is disposed in the second region 11c2 in the vicinity of the third region 11c3.

[0028] The third region 11c3 is a region surrounded by the main body portion 2. A plurality of recesses 12 (four in the milling tool 100 according to the first embodiment) may be formed in the third region 11c3. The recesses 12 are recessed from the third region 11c3 toward the axis A. The plurality of recesses 12 are arranged at equal intervals in the circumferential direction around the axis A.

[0029] A groove 12a may be formed in the side surface 11c at the center of the recess 12 in the axial direction Z. The groove 12a is recessed from the side surface 11c toward the axis A. The groove 12a is formed in the circumferential direction around the axis A.

[0030] The upper wall portion 21 protrudes from the side surface 11c between the third region 11c3 and the fourth region 11c4 in the radial direction R. As described above, the lower wall portion 23 is disposed in the second region 11c2. That is, the third region 11c3 is disposed between the upper wall portion 21 and the lower wall portion 23 in the axial direction Z.

[0031] The fourth region 11c4 is, for example, a region where the shaft portion 1 is held by the tool holder 10 (see FIG. 13).

[0032] <Main body> The battery 4, the circuit board 5, and the sensor 6 are housed in the internal space Q of the main body 2. As shown in Figures 1 to 5, the main body 2 has an upper wall 21, a side wall 22, and a lower wall 23. When viewed from the first end surface 11a on which the mounting portion 9 is formed, the upper wall 21 is located farther in the axial direction Z than the lower wall 23. In other words, the lower wall 23 is opposite the upper wall 21 in the axial direction Z.

[0033] As will be described later, a portion of the main body 2 may be made of a resin material in order to wirelessly transmit information detected by the sensor to the outside. The upper wall 21 and the side wall 22 of the main body 2 may be made of the same material as the shaft 1, for example, a metal material. The lower wall 23 may be made of a resin material, for example.

[0034] The lower wall portion 23 has an outer surface 23a and an inner surface 23b. The inner surface 23b is a surface that forms the internal space Q. In other words, the inner surface 23b faces the upper wall portion 21. The outer surface 23a is located opposite the inner surface 23b. In other words, in the axial direction Z, the outer surface 23a is closer to the first end face 11a than the inner surface 23b.

[0035] As described above, the upper wall portion 21 protrudes from the side surface 11c between the third region 11c3 and the fourth region 11c4 in the radial direction R. In other words, the upper wall portion 21 is integral with the shaft portion 1. The lower wall portion 23 is disposed in the second region 11c2.

[0036] The side wall portion 22 is continuous with the upper wall portion 21 and the lower wall portion 23. The side wall portion 22 surrounds the side surface 11c in the third region 11c3. The side wall portion 22 is disposed apart from the side surface 11c of the shaft portion 1 in the radial direction R. In other words, the side wall portion 22 is continuous with the upper wall portion 21 and the lower wall portion 23 at a position farther from the axis A in the radial direction R than the side surface 11c. The internal space Q of the main body portion 2 is formed by the upper wall portion 21, the side wall portion 22, the lower wall portion 23, and the side surface 11c in the third region 11c3.

[0037] As described above, the battery 4, the board 5, and the sensor 6 are housed in the internal space Q of the main body 2. That is, the battery 4, the board 5, and the sensor 6 are arranged between the upper wall 21 and the lower wall 23. The lower wall 23 is arranged between the mounting portion 9 and the battery 4. A jig (not shown) for fixing the battery 4, the board 5, and the sensor 6 in the internal space Q of the main body 2 may be housed in the internal space Q of the main body 2.

[0038] As shown in Figures 3 to 5, sensors 6 are disposed on the wall surfaces forming the recesses 12. The sensors 6 are, for example, sensors capable of measuring a desired physical quantity. The sensors 6 may be, for example, any of a strain sensor, a temperature sensor, and an acceleration sensor. The sensors 6 disposed in each of the plurality of recesses 12 may be sensors capable of measuring physical quantities different from each other. The sensors 6 may be disposed in at least one of the plurality of recesses 12.

[0039] The substrate 5 may include a first substrate 5a and a second substrate 5b. As shown in Fig. 5, the first substrate 5a is disposed on the third region 11c3. The first substrate 5a is disposed along the shape of the side surface 11c.

[0040] 5, the second substrate 5b is disposed at a distance from the first substrate 5a. The second substrate 5b is disposed between the first substrate 5a and the side wall portion 22 in the radial direction R. When viewed from the axial direction Z, the second substrate 5b is disposed along the side wall portion 22. The first substrate 5a and the second substrate 5b are electrically connected via a connection portion 5c.

[0041] The substrate 5 includes an insulating layer made of resin or the like and a circuit pattern (not shown) made of copper or the like formed on the surface of the insulating layer. The substrate 5 may be flexible so that it can be accommodated in the internal space Q of the main body 2.

[0042] The sensor 6 is electrically connected to the first substrate 5a via wiring 7. A wireless communication unit and an AD converter may be arranged on the substrate 5 (not shown). Information such as physical quantities detected by the sensor 6 is an analog signal. Therefore, by arranging an AD converter on the surface of the substrate 5, the analog signal can be converted into a digital signal and sent to the wireless communication unit. The signal sent to the wireless communication unit is then sent from the wireless communication unit to the outside of the main body 2. The signal is received and analyzed outside the main body 2, allowing the state of the milling tool 100 to be determined.

[0043] The battery 4 is electrically connected to the sensor 6 via the first substrate 5a. The battery 4 supplies power to the sensor 6, the wireless communication unit, and the AD converter. A connector (not shown) for electrically connecting to the battery 4 may be provided on the substrate 5.

[0044] As shown in Figures 3 and 4, the battery 4 is disposed between the first substrate 5a and the second substrate 5b in the radial direction R. The number of batteries 4 may be, for example, one or two. When two batteries 4 are housed in the internal space Q of the main body 2, the batteries 4 may be disposed so as to be point-symmetric with respect to the axis A in a plan view seen from the axial direction Z, as shown in Figure 5. In this way, eccentricity of the milling tool 100 does not occur when machining a workpiece.

[0045] The battery 4 may be a secondary battery such as a rechargeable nickel-metal hydride battery. If the battery 4 is a nickel-metal hydride battery, the battery 4 will release gas if overcharge occurs. To prevent the gas from filling the internal space Q of the main body 2, the main body 2 is provided with a vent hole h for venting the gas from the internal space Q to the outside. The vent hole h connects the outside of the main body 2 to the internal space Q. In this way, the gas released from the battery 4 can be vented through the vent hole h.

[0046] As described above, the upper wall portion 21 and the side wall portion 22 are made of a metal material. On the other hand, the lower wall portion 23 is made of a resin material. Therefore, the rigidity of the lower wall portion 23 is smaller than the rigidity of the upper wall portion 21 and the side wall portion 22. The ventilation holes h may be provided in the lower wall portion 23, which is easier to process than the upper wall portion 21 and the side wall portion 22.

[0047] The ventilation hole h is formed to extend from the inner surface 23b to the outer surface 23a of the lower wall portion 23. That is, as shown in Fig. 4, the ventilation hole h has a first opening ha on the outer surface 23a and a second opening hb on the inner surface 23b.

[0048] 5, the vent holes h are provided at positions facing the batteries 4. In this way, gas released from the batteries 4 can be efficiently exhausted.

[0049] The number of vent holes h may be, for example, one, or two or more. If there are a large number of vent holes h, gas released from the battery 4 can be efficiently exhausted.

[0050] During machining of a workpiece, cutting oil is used to cool the workpiece. Therefore, cutting oil is dispersed from the workpiece being machined. If a vent hole h is provided in the lower wall portion 23, cutting oil may enter the internal space Q through the vent hole h. Therefore, as shown in FIG. 4 , the inner circumferential surface of the vent hole h may be inclined with respect to the axial direction Z. Specifically, the first opening ha may be positioned farther from the axis A in the radial direction R than the second opening hb. In this manner, even if cutting oil enters the vent hole h, centrifugal force acts on the cutting oil entering the vent hole h because the milling tool 100 is rotating, and the cutting oil is discharged to the outside of the main body portion 2. As a result, the intrusion of cutting oil into the internal space Q through the vent hole h is reduced during machining of the workpiece.

[0051] When the thickness t of the ventilation hole h in the axial direction Z is large, the intrusion of cutting oil into the internal space Q through the ventilation hole h during machining of the workpiece is reduced. Furthermore, when the width w of the ventilation hole h in the radial direction R is small, the intrusion of cutting oil into the internal space Q through the ventilation hole h during machining of the workpiece is reduced. Therefore, the thickness t of the ventilation hole h in the axial direction Z may be 0.5 times or more, 1 time or more, or 2 times or more the width w of the ventilation hole h in the radial direction R. The width w of the ventilation hole h in the radial direction R may be 4 mm or less, 3 mm or less, or 2 mm or less. To prevent the ventilation hole h from being clogged with cutting oil and chips, the width w of the ventilation hole h in the radial direction R may be 1 mm or more.

[0052] <First Modification> Figure 7 is a schematic, partially enlarged cross-sectional view of a milling tool 100 according to a first modification of the first embodiment. If the distance from the cutting portion 3 to the lower wall portion 23 in the axial direction Z is large, scattered cutting oil may not reach the lower wall portion 23. Therefore, as shown in Figure 7, the inner circumferential surface of the ventilation hole h may extend along the axial direction Z. From a different perspective, the distance from the axis A to the first opening ha in the radial direction R may be the same as the distance from the axis A to the second opening hb.

[0053] 8 is a schematic partially enlarged cross-sectional view of a milling tool 100 according to a second modification of the first embodiment. The inner circumferential surface of the air hole h may include a portion extending along the radial direction R and a portion extending along the axial direction Z.

[0054] Specifically, the vent hole h may include a first inner circumferential region h1, a second inner circumferential region h2, and a third inner circumferential region h3. The first inner circumferential region h1, the second inner circumferential region h2, and the third inner circumferential region h3 form the inner circumferential surface of the vent hole h. Each of the first inner circumferential region h1 and the third inner circumferential region h3 extends along the axial direction Z. The second inner circumferential region h2 extends along the radial direction R.

[0055] The first inner circumferential region h1 is continuous with the first opening ha. The second inner circumferential region h2 is continuous with the first inner circumferential region h1 and the third inner circumferential region h3. The third inner circumferential region h3 is continuous with the second opening hb. In a plan view seen from the axial direction Z, the distance from the axis A to the first inner circumferential region h1 in the radial direction R is greater than the distance from the axis A to the third inner circumferential region h3.

[0056] In this way, the distance from the axis A to the first opening ha is greater than the distance from the axis A to the second opening hb in the radial direction R. As a result, even if cutting oil seeps into the ventilation hole h, the cutting oil will not enter the internal space Q of the main body 2.

[0057] <Third Modification> Fig. 9 is a schematic, partially enlarged cross-sectional view of a milling tool 100 according to a third modification of the first embodiment. Fig. 10 is a schematic, partially enlarged cross-sectional view of the vent hole h in region X of Fig. 9 .

[0058] 10 , the first opening ha has a first end pa1 closest to the axis A in the radial direction R and a third end pa3 farthest from the axis A. The second opening hb has a second end pb2 farthest from the axis A in the radial direction R and a fourth end pb4 closest to the axis A.

[0059] When machining a workpiece, cutting oil splashes, for example, from the cutting portion 3 that comes into contact with the workpiece toward the ventilation hole h. In other words, in order to prevent cutting oil from entering the internal space Q of the main body 2, the second opening hb may be disposed in a region where the axis A is located when viewed from the straight line connecting the cutting portion 3 and the first end pa1.

[0060] The first end surface 11a has an outer circumferential portion 9a. The outer circumferential portion 9a is the farthest from the axis A in the radial direction R on the first end surface 11a. The first end surface 11a is connected to the side surface 11c in the first region 11c1 at the outer circumferential portion 9a. A straight line T shown in FIG. 9 connects the outer circumferential portion 9a and the first end pa1. As shown in FIG. 10, the inner surface 23b has an intersection point pc where the line T intersects with the line T. In other words, the intersection point pc is on the line T and on the inner surface 23b. The first end pa1 is positioned closer to the axis A in the radial direction R than the intersection point pc.

[0061] As shown in Fig. 9 , the second opening hb may be located in the region where the axis A is located when viewed from the straight line T. From a different perspective, as shown in Fig. 10 , the second end pb2 may be located at a position closer to the axis A than the intersection point pc in the radial direction R. In this way, even if cutting oil splashes from the cutting portion 3 or the mounting portion 9 that contacts the workpiece toward the vent hole h (along the straight line T), the cutting oil will not enter the internal space Q of the main body 2.

[0062] The first opening ha does not have to overlap with the second opening hb in a plan view seen from the axial direction Z. Specifically, as shown in FIG. 9 , the first end pa1 may be positioned farther from the axis A in the radial direction R than the second end pb2. From a different perspective, the distance L1 from the axis A to the first end pa1 in the radial direction R may be greater than the distance L2 from the axis A to the second end pb2 in the radial direction R. In this way, the first opening ha does not overlap with the second opening hb in a plan view seen from the axial direction Z. As a result, even if cutting oil seeps into the vent hole h, centrifugal force acts on the cutting oil that has penetrated the vent hole h, and the cutting oil is discharged to the outside of the main body 2.

[0063] 11 is a schematic partial enlarged cross-sectional view of a vent hole h according to a fourth modification of the first embodiment. The second end portion pb2 may be disposed closer to the axis A in the radial direction R than the intersection point pc. Therefore, in a plan view seen from the axial direction Z, a portion of the first opening portion ha may overlap a portion of the second opening portion hb, and the second end portion pb2 may be disposed farther from the axis A in the radial direction R than the first end portion pa1.

[0064] From a different perspective, it is sufficient that the distance from the axis A in the radial direction R to the intersection point pc is shorter than the distance L2 from the axis A to the second end pb2 in the radial direction R, and the distance L1 from the axis A to the first end pa1 in the radial direction R may be shorter than the distance L2 from the axis A to the second end pb2 in the radial direction R. In this way, when cutting oil splashes from the cutting portion 3 or the mounting portion 9 that contacts the workpiece toward the vent hole h (along the straight line T), the cutting oil will not infiltrate into the internal space Q of the main body 2 even if part of the first opening ha overlaps part of the second opening hb in a plan view seen from the axial direction Z.

[0065] <Fifth Modification> Figure 12 is a schematic, partially enlarged cross-sectional view of a milling tool 100 according to a fifth modification of the first embodiment. The milling tool 100 may include a filter 8 that blocks the vent hole h. The filter 8 may be any filter that blocks liquids but allows gases to pass through. In this manner, even if cutting oil seeps into the vent hole h, the filter 8 prevents the cutting oil from entering the internal space Q of the main body 2. Furthermore, since the filter 8 allows gases to pass through, it can exhaust gas released from the battery 4. The filter 8 may be attached to the lower wall 23 using, for example, an adhesive.

[0066] The filter 8 may be disposed on the outer surface 23a so as to block the first opening ha of the ventilation hole h in the outer surface 23a.

[0067] The filter 8 may also be disposed on the inner surface 23 b so as to block the second openings hb of the ventilation holes h on the inner surface 23 b. In this way, scattered chips will not hit the filter 8 when the workpiece is machined.

[0068] 13 is a schematic partially enlarged cross-sectional view of a milling tool 100 according to a sixth modification of the first embodiment. The ventilation hole h may be provided in at least one of the upper wall portion 21 and the side wall portion 22 as long as it communicates from the outside of the main body portion 2 with the internal space Q.

[0069] 13, a vent hole h may be provided in the side wall portion 22. This allows gas released from the battery 4 to be exhausted from the internal space Q of the main body portion 2 to the outside of the main body portion 2. Furthermore, when machining a workpiece, the intrusion of cutting oil into the internal space Q through the vent hole h is reduced.

[0070] <Seventh Modification> Figure 14 is a schematic cross-sectional view of a milling tool 100 according to a seventh modification of the first embodiment. As described above, when the width w of the vent hole h is large, gas released from the battery 4 can be exhausted. The width w of the vent hole h may be, for example, 4 mm or more. As shown in Figure 14, the vent hole h does not have to be provided in a position facing the battery 4.

[0071] Second Embodiment <Configuration of Milling Tool> Next, a milling tool 100 according to a second embodiment will be described.

[0072] 15 is a schematic perspective view of a milling tool 100 according to the second embodiment. The milling tool 100 includes a tool holder 10 in addition to the components of the milling tool 100 according to the first embodiment. The tool holder 10 holds the side surface 11c in the fourth region 11c4 of the shaft portion 1.

[0073] In the milling tool 100 according to the second embodiment, the tool holder 10 is inserted into an insertion port formed in the spindle of the machine tool. In this way, the milling tool 100 according to the second embodiment is held in the spindle of the machine tool. The tool holder 10 may be modified as appropriate to suit the holding mechanism of the spindle of the machine tool.

[0074] Next, the effects of the milling tool 100 according to the present disclosure will be described. To grasp the state of the milling tool 100, a sensor 6 and a battery 4 that supplies power to the sensor 6 are housed in the internal space Q of the main body 2. If the battery 4 is a nickel-metal hydride battery that releases gas, there is a risk that the internal space Q of the main body 2 will be filled with gas.

[0075] The milling tool 100 according to the present disclosure includes a shaft portion 1, a main body portion 2, a battery 4, and a sensor 6. The main body portion 2 is attached to the shaft portion 1. The battery 4 is housed in an internal space Q of the main body portion 2. The sensor 6 is electrically connected to the battery 4. An air vent h that communicates with the internal space Q is provided in the main body portion 2. This allows gas released from the battery 4 to be exhausted from the internal space Q of the main body portion 2 in which the battery 4 is housed to the outside of the main body portion 2.

[0076] According to the milling tool 100 of the present disclosure, the shaft portion 1 may have an attachment portion 9. A cutting portion 3 that cuts a workpiece may be attached to the attachment portion 9. The main body portion 2 may have a bottom wall portion 23. The bottom wall portion 23 may be disposed between the attachment portion 9 and the battery 4. A vent hole h may be provided in the bottom wall portion 23. This allows gas released from the battery 4 to be exhausted through the bottom wall portion 23.

[0077] The milling tool 100 according to the present disclosure may be rotatable around the axis A. The lower wall portion 23 may have an inner surface 23b that forms the internal space Q and an outer surface 23a located opposite the inner surface 23b. A direction perpendicular to the direction in which the axis A extends may be defined as the radial direction R. The first opening ha of the vent hole h on the outer surface 23a may be positioned farther from the axis A in the radial direction R than the second opening hb of the vent hole h on the inner surface 23b. This reduces the intrusion of cutting oil into the internal space Q through the vent hole h when machining the workpiece.

[0078] According to the milling tool 100 of the present disclosure, the first opening ha may have a first end pa1 that is closest to the axis A in the radial direction R. The second opening hb may have a second end pb2 that is farthest from the axis A in the radial direction R. The first end pa1 may be disposed at a position farther from the axis A in the radial direction R than the second end pb2. This reduces the intrusion of cutting oil into the internal space Q through the vent hole h when machining the workpiece.

[0079] According to the milling tool 100 of the present disclosure, the shaft portion 1 may have an attachment portion 9. A cutting portion 3 for cutting a workpiece may be attached to the attachment portion 9. The main body portion 2 may have an upper wall portion 21, a lower wall portion 23, and a side wall portion 22. The lower wall portion 23 may be located opposite the upper wall portion 21. The side wall portion 22 may be connected to the upper wall portion 21 and the lower wall portion 23. A battery 4 may be disposed between the upper wall portion 21 and the lower wall portion 23. A vent hole h may be provided in at least one of the upper wall portion 21 and the side wall portion 22. This allows gas released from the battery 4 to be exhausted from the internal space Q of the main body portion 2 in which the battery 4 is housed to the outside of the main body portion 2. Furthermore, the intrusion of cutting oil into the internal space Q through the vent hole h during machining of the workpiece is reduced.

[0080] According to the milling tool 100 of the present disclosure, the vent hole h may be provided in a position facing the battery 4. This allows gas released from the battery 4 to be efficiently exhausted from the internal space Q of the main body 2 in which the battery 4 is housed to the outside of the main body 2.

[0081] The milling tool 100 according to the present disclosure may include a filter 8 that blocks the vent hole h. The filter 8 may be impermeable to liquids but permeable to gases. This reduces the intrusion of cutting oil into the internal space Q through the vent hole h during machining of the workpiece.

[0082] The embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The basic scope of the present disclosure is defined by the claims, not the above-described embodiments, and is intended to include all modifications within the meaning and scope of the claims.

[0083] 1 shaft portion, 2 main body portion, 3 cutting portion, 4 battery, 5 substrate, 5a first substrate, 5b second substrate, 5c connection portion, 6 sensor, 7 wiring, 8 filter, 9 mounting portion, 9a outer peripheral portion, 10 tool holder, 11a first end face, 11b second end face, 11c side surface, 11c1 first region, 11c2 second region, 11c3 third region, 11c4 fourth region, 12 recess, 12a groove portion, 21 upper wall portion, 22 side wall portion, 23 lower wall portion, 23a outer surface, 23b inner surface, 100 milling tool, A axis, h ventilation hole, h1 first inner peripheral region, h2 second inner peripheral region, h3 third inner peripheral region, ha first opening, hb second opening, L1, L2 distance, pa1 first end, pb2 2nd end, pa3 3rd end, pb4 4th end, pc intersection, Q internal space, R radial direction, T straight line, w width, t thickness, Z axial direction.

Claims

1. A milling tool comprising: a shaft portion; a main body portion attached to the shaft portion; a battery housed in an internal space of the main body portion; and a sensor electrically connected to the battery, wherein the main body portion is provided with an air vent communicating with the internal space.

2. A milling tool as described in claim 1, wherein the shaft portion has an attachment portion to which a cutting portion that cuts a workpiece is attached, the main body portion has a lower wall portion that is arranged between the attachment portion and the battery, and the lower wall portion is provided with the ventilation hole.

3. A milling tool as described in claim 2, wherein the milling tool is rotatable around an axis, the lower wall portion has an inner surface that forms the internal space and an outer surface located opposite the inner surface, and when a direction perpendicular to the direction in which the axis extends is defined as a radial direction, the first opening of the air hole on the outer surface is positioned farther from the axis in the radial direction than the second opening of the air hole on the inner surface.

4. A milling tool as described in claim 3, wherein the first opening has a first end closest to the axis in the radial direction, the second opening has a second end farthest from the axis in the radial direction, and the first end is positioned farther from the axis in the radial direction than the second end.

5. A milling tool as described in claim 1, wherein the shaft portion has an attachment portion to which a cutting portion for cutting a workpiece is attached, the main body portion has an upper wall portion, a lower wall portion opposite the upper wall portion, and a side wall portion connected to the upper wall portion and the lower wall portion, the battery is disposed between the upper wall portion and the lower wall portion, and the air hole is provided in at least one of the upper wall portion and the side wall portion.

6. A milling tool according to any one of claims 1 to 5, wherein the vent hole is provided in a position facing the battery.

7. The milling tool according to any one of claims 1 to 6, further comprising a filter that blocks the air vent, the filter being impermeable to liquids but permeable to gases.

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