JP4179601B2 - Arbor and rotating tools - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an arbor for mounting rotating tools such as a face mill, a shell end mill, a boring cutter, a side cutter, and the like, and particularly to the internal supply of compressed air and cutting oil (hereinafter referred to as fluid). Is about what is possible.
[0002]
[Prior art]
Conventionally, in a face mill, a shell end mill, a boring cutter, a side cutter, etc. (hereinafter referred to as “rotary tool”), a fluid supply method for removing chips includes the following.
(1) This is a method in which the fluid is supplied from the outside of a rotary tool such as a face mill. Specifically, as shown in FIG. 11, the fluid is supplied from a nozzle provided in the machine tool toward the cutting portion. It is a method.
(2) The fluid is supplied from the inside of the rotary tool 30 such as a face mill. Specifically, as shown in FIGS. 12 (a), (b) and FIG. 13, the arbor body 10 has a shaft. A fluid supply hole 19 penetrating in the axial direction is formed near the center. A central hole 241 is also formed in the axial direction in the vicinity of the axial center of the fixing member 20 that fixes the rotary tool 30. When the rotary tool 30 is attached to the arbor, the fluid supply hole 19 and the central hole 241 communicate with each other, and the fluid supplied from the main spindle 111 of the machine tool passes through the arbor and the fixing member 20. Injected from the center of the front end of the flange portion 22 toward the axial direction of the arbor. (For example, Non-Patent Document 1)
(3) The fluid is supplied from the inside of the rotary tool 30 such as a face mill. Specifically, as shown in FIGS. 14 to 17, the arbor body 10 has a pull stud mounting hole 13 that opens on the small diameter side end surface of the taper shank portion 11 and a central mounting hole 35 of the rotary tool 30 on the other end surface side. A fluid supply having a fitting fitting portion 15 to be fitted and a fixing member attaching hole 17 opened in an end face of the fitting fitting portion 15 and communicating with the pull stud attaching hole 13 and the fixing member attaching hole 17. A hole 19 is drilled. The fixing member 20 that engages with the fixing member mounting hole 17 has a central hole 241 formed in the vicinity of the axial center of the shaft portion 21, and a branch hole 242 that communicates from the central hole 241 to the outer peripheral surface of the shaft portion 21. Are formed almost symmetrically. In the rotary tool 30, a suction port 37 that opens in the inner wall of the central mounting hole 35, and a standing wall 38 of the chip pocket 31 that communicates with the suction port 37 and that is provided on the outer periphery of the tip of the rotary tool 30. An opening 39 is provided. With the above configuration, the fluid supplied from the main spindle 111 of the machine tool passes through the arbor body 10, the fixing member 20, and the rotary tool 30, and is supplied from the injection port 39 toward the cutting edge. (For example, Non-Patent Document 2)
[0003]
[Non-Patent Document 1]
CUTING TOOLS catalog issued by Hitachi Tool Co., Ltd. (issued in September 2002) page 71 仕 様 Specifications of arbor for high feed radius mill ASR type [Non-patent document 2]
Published by Mitsubishi Materials Corporation Diatita Knit News LJ410 “Radius cutter AJX type for high feed” (issued in October 2002) Page 2 Specification of arbor type Specification drawing of special arbor standard on page 3 [0004]
[Problems to be solved by the invention]
However, in the fluid supply method described in the section (1) of the prior art, it is difficult for the rotary tool having a large outer diameter to eject the fluid to the entire cutting portion. In addition, when the feed direction of the rotary tool 30 is changed or when the rotary tool 30 is replaced with a rotary tool 30 having a different outer diameter or overall length, the fluid is not sprayed to the cutting edge, so that the nozzle 60 faces the cutting edge each time. There was a need to adjust. Alternatively, since the position of the nozzle 60 cannot be adjusted to the cutting edge each time in unmanned machining, the chips are not removed and are caught between the cutting edge of the rotary tool 30 and the work material, and the machining surfaces 70 and 71 are processed. There was a problem of scratching the blade and causing the cutting edge to be lost.
Also in the fluid supply method described in the section (2) of the prior art, the fluid is only sprayed in the axial direction from the vicinity of the axial center of the rotary tool 30 and is not directly sprayed toward the cutting edge. Chips may not be removed sufficiently, and the processed surfaces 70 and 71 may be damaged or the cutting edges may be lost.
The fluid supply method described in the section (3) of the prior art can accurately supply the fluid toward all the cutting edges. However, the cross-sectional area of the central hole 241 or the branch hole 242 provided in the vicinity of the axial center of the fixing member 20 cannot be secured due to the restriction of the outer diameter of the shaft portion 21 of the fixing member 20. Therefore, the cross-sectional area of the central hole 241 or the branch hole 242 is smaller than the total area of the injection port 39 provided in the rotary tool 30, and the pressure of the fluid supplied to the cutting edge is reduced. Therefore, there is a problem that the chips are not reliably removed and are caught between the cutting edge of the rotary tool 30 and the work material, and the processing surfaces 70 and 71 are scratched or the cutting edge is lost. . If the cross-sectional area of the central hole 241 or the branch hole 242 provided inside the fixing member 20 is increased in order to increase the pressure of the fluid sprayed to the cutting edge, the strength of the shaft portion 21 of the fixing member 20 is reduced. There is a possibility that troubles such as insufficient holding force of the rotary tool 30 or breakage of the shaft portion 21 may occur.
[0005]
The present invention solves the above-mentioned problems, and the fluid supplied from the machine tool passes through the supply passages provided in the arbor and the rotary tool, and accurately and high pressure is applied to the cutting edge of the rotary tool. Further, it is possible to inject the air and to suppress the strength reduction of the fixing member of the arbor.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the arbor of the present invention has a shank portion that is inserted and held in the spindle of the machine tool, and has an attachment fitting portion that fits the rotary tool at the other end portion. An arbor including an arbor body and a fixing member that engages with an inner diameter portion of the attachment fitting portion, and the arbor body penetrates or communicates from an end surface of the shank portion to an end surface or an outer peripheral surface of the fitting portion. The fixing member has a shaft portion provided on the outer peripheral surface with an engaging portion that engages with the inner diameter portion of the mounting fitting portion at one end portion thereof , and a flange portion at the other end portion; the outer peripheral surface of the shank characterized in that it is extended in the longitudinal direction of the shaft portion so as to open to the end face of the shaft portion with the concave groove of at least one strip is cut out the engaging portion.
Preferably the concave groove that extends in the axial portion of the fixing member cross-sectional shape is square groove shape, or arc shape, or U-shaped, or, is either in the form of V-shaped, the fixing member concave grooves extending in the axial portion is equal to or less than 6 or more one.
Further, the rotary tool of the present invention is a rotary tool mounted on the arbor, wherein a central mounting hole that fits into the mounting fitting portion, a counterbored hole that corresponds to the flange portion of the fixing member, and the central mounting A through hole communicating with the hole and the counterbore hole, and has an inlet opening on either the inner wall or the end surface of the central mounting hole or the inner peripheral surface of the through hole. It has an injection port which opens toward the outer peripheral direction of the rotating tool. And, preferably characterized in that the total cross-sectional area of the concave groove that extends in the shaft portion of the fixing member in the rotary tool is more than the total cross-sectional area of the injection port.
[0007]
According to the present invention, the fluid supplied from the spindle of the machine tool is supplied to the attachment fitting portion through the hole provided in the arbor body, and in the fixing member engaged with the attachment fitting portion. through the extended been recessed groove on the outer peripheral surface of the shaft portion, it is supplied to the gap between the central mounting hole of the rotary tool and the fitting part of the arbor body. The fluid is supplied from a suction port that opens to the central mounting hole of the rotary tool, passes through the rotary tool, communicates with the suction port, and opens from an injection port that opens toward the outer peripheral direction of the rotary tool. Be injected. According to such a configuration, since the fluid is hardly supplied except for the above-described path, the fluid can be ejected from the ejection port toward a desired position with almost no loss. In particular, the concave groove is fluid passages in said stationary member so as to extend to the outer periphery of the shaft portion, the strength reduction of the shank decreases less of the cross-sectional area is suppressed. Therefore, the rotary tool attached to the arbor can be fixed with a high tightening force. Furthermore, since the total cross-sectional area of the concave groove is not less than the total cross-sectional area of the injection port, the hardly reduced pressure of the fluid ejected from the ejection nozzle, increased chip removal effect, reliably chip removal it can. In the rotary tool, the injection port can be provided at a position close to the cutting edge and can be injected in a desired direction, so that the fluid can be accurately and highly pressurized toward the cutting edge. Can be injected.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a front view including a partial cross-sectional view of a state where a rotating tool is mounted on an arbor. 2A to 2C are a front view and a side view of a fixing member of the arbor, respectively. FIG. 3 is a view showing a fluid passage between the arbor tip and the rotary tool. FIG. 4 is a perspective view of the rotary tool. FIGS. 5A to 5C and FIGS. 6A to 6C are a front view and a side view of a modified example of the fixing member. FIGS. 7A to 7I are side views of the fixing member, showing a modification of the groove shape and the number of grooves.
[0009]
As shown in FIG. 1, the arbor body 10 includes a tapered shank portion 11 that is inserted and held in a main shaft 111 of a machine tool (not shown), a flange portion 12 at the large-diameter end of the tapered shank portion 11, A pull stud mounting hole 13 that opens to the end surface on the small diameter side of the tapered shank portion 11 and an engaging portion 14 on the inner diameter of the pull stud mounting hole 13 are provided. A pull stud bolt 40 is engaged and fixed to the engaging portion 14. Further, on the opposite side of the taper shank portion 11, there are an attachment fitting portion 15 and an attachment reference surface 16, a fixing member attachment hole 17 that opens to an end surface of the attachment fitting portion 15, and an inner diameter of the fixing member attachment hole 17. And the engaging portion 18. A fixing member 30 is engaged and fixed to the engaging portion 18. A fluid supply hole 19 communicating with the pull stud mounting hole 13 and the fixing member mounting hole 17 is formed in the vicinity of the axial center of the arbor body 10. A through hole 41 is also formed in the vicinity of the axial center of the pull stud 40 that is engaged with and fixed to the small-diameter end of the tapered shank portion 11, and the fluid extends from the pull stud 40 to the fixing member mounting hole 17 of the arbor body 10. The passage is formed to communicate.
[0010]
Fixing member 20, as shown in FIG. 2, and a shaft portion 21 and the flange portion 22, the engaging portion 23 is formed on an outer peripheral surface of the shaft portion 21, further, with respect to the center axis to the outer peripheral surface two concave grooves 24 are extended in the axial direction approximately symmetrically in the. The concave groove 24 is open to the shaft portion 21 end surfaces, cross-sectional shape angled groove. The fixing member 20, in a state where the fixing member is engaged with the mounting hole 17 of the arbor body 10, the two concave grooves 24 is in communication with the fixed member mounting holes 17.
[0011]
The rotary tool 30 attached to the arbor body 10 is provided with at least one chip pocket 31 and a tip seat 32 along the outer peripheral surface at the outer peripheral portion of the tip, and a known material such as a cemented carbide is provided in the tip seat 32. A chip 50 made of a material is detachably mounted. Although not shown in FIG. 1, the tip 50 is wedged to the tip seat 32 by a wedge. An insertion hole 33 through which the fixing member 20 is inserted is provided in the vicinity of the axial center of the rotary tool 30, and the insertion hole 33 is fixed to a central attachment hole 35 that opens to the base end face 34 and to the other end face side. It communicates with the member engagement hole 36. In the rotary tool 30, the central mounting hole 35 is fitted into the mounting fitting portion 15 of the arbor body 10. The fixing member 20 engages with the fixing member mounting hole 17 of the arbor and also engages with the fixing member engaging hole 36 of the rotating tool 30, whereby the rotating tool 30 has its base end surface 34. Is fixed to the reference mounting surface 16 of the arbor body 10. The rotary tool 30 is formed with a fluid suction port 37 that opens at the bottom end face of the central mounting hole 35, and as shown in FIG. 4 (chip shape and tip fixing means are different), An injection port 39 that opens outward from the standing wall 38 of the communication chip pocket 31 is provided.
[0012]
Next, the fluid path in the arbor body 10 and the rotary tool 30 described above will be described with reference to the drawings. A fluid supplied from a main shaft 111 of a machine tool (not shown) passes through a through hole 41 in the vicinity of the axial center of the pull stud 40 attached to the end face of the tapered shank portion 11 of the arbor main body 10 and near the axial center of the arbor main body 10. The fluid passes through the perforated fluid supply hole 19 and is supplied to the fixing member mounting hole 17. Then, the fluid, as shown by the shaded portion of FIG. 3, it is supplied to the concave groove 24 which is extended to the outer periphery of the shaft portion 21 of the fixing member 20 for engaging the fixing member mounting holes 17. The concave groove 24, in a state of mounting a rotary tool 30 is formed so as to protrude from the end surface of the fitting part 15 of the arbor body 10, the fluid having passed through the concave groove 24, the rotary tool 30 Is supplied to the gap generated in the central mounting hole 35. Then, the fluid is supplied from the suction port 37 that opens to the end face of the central mounting hole 35 of the rotary tool 30, passes through the rotary tool 30, and the injection port 39 that opens to the standing wall 38 of the chip pocket 31. Is sprayed toward the cutting edge.
[0013]
In addition, it is preferable that the said injection port 39 is provided with respect to all the chips | tips 50 with which the rotary tool 30 was mounted | worn in order to heighten the effect of chip removal. Moreover, in order not to impair the pressure of the fluid, the cross-sectional area of each part of the fluid passage provided in the arbor body 10 is preferably not less than the total cross-sectional area of the injection port 39 and not more than 5 times the total cross-sectional area. By doing so, the pressure of the fluid ejected from the ejection port 39 does not decrease. Particularly in the axial portion 21 of the fixing member 20, since the total cross-sectional area of the concave groove 24 which extends to the outer periphery becomes larger which leads to decrease in strength of the shaft portion 21, more preferably, on the outer periphery of the shaft portion 21 the total cross-sectional area of the concave groove 24 that extends the over the total cross-sectional area of the injection port 39 may not more than 3 times the total cross-sectional area.
[0014]
As described above, the fluid supplied from the machine tool is ejected from a position that finally passes through the inside of the pull stud 40, the arbor body 10, the fixing member 20, and the rotary tool 30. In addition, since chips are ejected accurately and with high pressure toward the cutting edge, chips can be reliably removed.
[0015]
For example, the shape of the fixing member 20 can be modified as shown in FIGS. 5 and 6 without being limited to the above-described embodiment. In the fixing member 20 shown in FIG. 5, the portion of the flange portion 22 that contacts the fixing member engagement hole 36 of the rotary tool 30 is tapered. Then, the outer diameters of the fixing member engaging hole 36 and the flange portion 22 of the fixing member 20 can be reduced, and the rotary tool 30 is firmly fixed to the arbor body 10, so that the rotation with a small diameter is possible. It is preferable when there is a restriction on the outer diameter of the fixing member engagement hole 36 as in a tool. The fixing member 20 shown in FIG. 6 has a relatively large outer diameter of the flange portion 22 with respect to the shaft portion 21. Since such a fixing member 20 can ensure a wide contact surface with respect to the rotary tool 30, the rotary tool 30 can be fixed to the arbor body 10 very strongly. In particular, this is a preferred modification as an arbor fixing member 20 on which a large-diameter rotary tool is mounted. On the other hand, with respect to the rotary tool 30, the means for attaching the tip 50 is not limited to the wedge, and is not limited to the one to which the tip is detachably attached. For example, the cutting blade member is rotated like a brazing tool. It may be provided integrally with the tool body, and can be variously modified without departing from the gist of the present invention.
[0016]
Also, showing a modification of the concave groove 24 formed on the shaft portion 21 of the fixing member 20 in FIG 7. As shown in (a) to (f) of FIG. 7, the cross-sectional shape of the concave groove 24 is square groove shape, an arc shape, U-shape, it may be selected from shapes such as V-shape. In addition, in the shape of a square groove, one with a chamfered corner or one rounded into an arc is preferable for increasing the strength of the shaft 21. Furthermore, the concave groove 24 of the fixing member 20 be made of one, the fluid path can be ensured. Further, as described above, the injection ports 39 of the rotary tool 30 are preferably provided for all the chips 50. In such a case, a plurality of suction ports 37 concentrically provided in the central mounting hole 35 are provided. the concave grooves 24 are preferably more provided as shown in (g) through (i) in FIG. 7 for supplying fluid at a uniform pressure against. However, if the number is greater than 6, the engagement portion 23 of the shaft portion 21 is insufficient, and the engagement with the arbor body 10 is insufficient. In addition, most generally the engaging portion 23 is intended to be formed by the M24 following screw, in such a fixing member 20, the number of the concave groove 24 is preferably less than or more one 4.
[0017]
Next, in order to compare the strength of the shaft portion 21 of the fixing member 20 of the arbor, the cross-sectional area of the shaft portion 21 was compared between this embodiment and the prior art. A conventional arbor corresponds to Non-Patent Document 2, and a front view, a side view, and a cross-sectional view of the arbor are shown in FIGS. 9A to 9C are a front view, a side view, and a cross-sectional view of the fixing member of the arbor in this embodiment. Further, the rotary tool 30 mounted on both arbors has an outer diameter of 63 mm, eight chips 50 to be mounted, and an injection port 39 provided on the standing wall 38 of the chip pocket 31 for all the chips 50. The diameter is 1.5 mm. The total cross-sectional area of the injection port 39 in the rotary tool 30 is 14.1 mm ² . The fixing member 20 of the conventional arbor shown in FIG. 8 has a central hole 241 formed in the vicinity of the center of the shaft, communicates with the central hole 241 and extends in the diametrical direction so as to open on the outer peripheral surface of the shaft portion 21. Is provided. The diameter of the central hole 241 is 4.3 mm, and the diameter of the branch hole 242 is 3 mm. The total cross-sectional area of the central hole 241 at this time is 14.5 mm ² , which is substantially the same as the total cross-sectional area of the injection port 39 provided in the rotary tool 30, and the pressure of the supplied fluid is reduced. Absent. At this time, the cross-sectional area of the shaft portion 21 indicated by oblique lines is 34.4 mm ² . On the other hand, the fixed member 20 in the first embodiment of the present invention, as shown in FIG. 9, is obtained by extending the two square groove-shaped concave groove 24 in the shaft portion 21 the outer periphery from the shaft portion 21 end face . Wherein the dimensions of the concave grooves 24, 4 mm in width, a is 2mm depth, these dimensions, the cross-sectional area of the central bore 241 of the total cross-sectional area of the concave groove 24 is provided on the above-described conventional arbor of the fixing member 20 Is set to be equal to At this time, the shaft portion 21 of this embodiment can secure a cross-sectional area of 48.8 mm ² , and the cross-sectional area is increased by 42% with respect to the fixing member 20 of the prior art. The cross-sectional strength of the shaft portion 21 can be significantly increased while ensuring. In other words, it is possible to greatly increase the amount of fluid supplied while ensuring the same cross-sectional strength as the fixing member 20 of the prior art. As described above, in the arbor of this embodiment, the total cross-sectional area of the fluid passage in the fixing member 20 is larger than the total cross-sectional area of the injection port 39 of the rotary tool, and the strength reduction of the fixing member 20 is suppressed. Therefore, the pressure of the fluid to be supplied is not reduced, and the rotary tool 30 can be firmly fixed.
[0018]
Next, a second embodiment will be described with reference to FIG. In this embodiment, as shown in FIG. 10, at least one branch hole 151 penetrating the outer peripheral surface of the attachment fitting portion 15 of the arbor body 10 and the inner wall of the fixing member attachment hole 17 is provided. A groove 371 is formed on the inner wall of the central mounting hole 35 of the rotary tool 30 so as to surround the opening of the branch hole 151, and a suction port 37 that opens to the groove 371 is provided, and communicates with the suction port 37. An injection port 39 is provided in the upright wall 38 of the chip pocket 31 of the rotary tool 30. In the configuration other than that described above, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.
[0019]
According to the above configuration, the fluid passes through the fluid supply hole 19 of the arbor body 10, passes through the concave groove 24 which extends to the outer periphery of the stationary member 20, the opening of the outer peripheral surface from the branch hole 151 Supplied. Then, the air is supplied to the suction port 37 through the groove 371 on the inner wall of the central mounting hole 35 of the rotary tool 30. Finally, as in the first embodiment, fluid is ejected from the ejection port 39 toward the cutting edge. The injection port 39 is preferably provided for all the chips 50 attached to the rotary tool 30 in order to enhance the chip removal effect. In order not to impair the pressure of the fluid, the cross-sectional area of each part of the fluid passage provided in the arbor is preferably equal to or larger than the total cross-sectional area of the injection port 39. By doing so, the pressure of the fluid ejected from the ejection port 39 does not decrease. Furthermore, according to this embodiment, the concave groove 24 provided on the outer periphery of the shaft portion 21 of the fixing member 20 may be the length of the axial direction shorter than the first embodiment, the shaft portion The strength of 21 is further increased.
[0020]
【The invention's effect】
As described above, according to the arbor and rotary tool of the present invention, the fluid supplied from the spindle 111 of the machine tool passes through the arbor and the rotary tool and travels toward the cutting edge from a position close to the cutting edge. And accurately and at a high pressure. Therefore, chips near the cutting edge can be reliably removed, chips are not bitten between the cutting edge and the work material, the work surface is not damaged, and chipping of the cutting edge is prevented. To do.
[Brief description of the drawings]
FIG. 1 is a front view and a partial cross-sectional view of a first embodiment of an arbor and a rotary tool of the present invention.
FIG. 2A is a front view of a fixing member in the arbor of the first embodiment.
(B) It is a side view of the fixing member in the arbor of 1st Embodiment.
(C) It is a side view of the fixing member in the arbor of 1st Embodiment.
FIG. 3 is a cross-sectional view showing a fluid passage in the arbor tip and the rotary tool of the first embodiment.
FIG. 4 is a perspective view of the rotary tool according to the first embodiment.
FIG. 5A is a front view of a modified example of a fixing member in the arbor of the first embodiment.
(B) It is a side view of the modification of the fixing member in the arbor of 1st Embodiment.
(C) It is a side view of the modification of the fixing member in the arbor of 1st Embodiment.
FIG. 6A is a front view of another modification of the fixing member in the arbor of the first embodiment.
(B) It is a side view of another modification of the fixing member in the arbor of 1st Embodiment.
(C) It is a side view of another modification of the fixing member in the arbor of 1st Embodiment.
7 (a) to (b) is a side view of the fixing member in the arbor in the first embodiment and showing a modification of the cross-sectional shape and number of slots recessed groove.
FIGS. 8A to 8C are a front view, a side view, and a cross-sectional view taken along line AA of a fixing member in a conventional arbor.
FIGS. 9A to 9C are a front view, a side view, and a B-B cross-sectional view of a fixing member in the arbor of the first embodiment of the present invention.
FIG. 10 is a cross-sectional view showing a fluid passage in an arbor tip and a rotary tool according to a second embodiment of the present invention.
FIG. 11 is a diagram illustrating a conventional fluid supply method, and is a diagram illustrating a system for supplying fluid from the outside.
FIG. 12 is a diagram showing a prior art of an arbor and a rotary tool having a fluid passage inside.
13 is a diagram of Non-Patent Document 1. FIG.
FIG. 14 is a view showing another prior art of an arbor and a rotary tool having a fluid passage therein.
FIGS. 15A to 15C are a front view, a side view, and a bottom view of a fixing member in the prior art arbor shown in FIG. 14;
16 is a cross-sectional view showing a fluid passage in the prior art arbor tip shown in FIG. 14 and a rotary tool.
17 is a diagram of Non-Patent Document 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Arbor body 11 Tapered shank part 111 Machine tool spindle 12 Flange part 13 Pull stud mounting hole 14 Engaging part 15 Mounting fitting part 151 Branching hole 16 Reference mounting surface 17 Fixing member mounting hole 18 Engaging part 19 Fluid supply hole 20 fixing member 21 shaft section 22 flange portion 23 engaging portion 24 recessed grooves 241 center hole 242 branch hole 30 the rotary tool 31 chip pocket 32 tip seat 33 through hole 34 proximal end face 35 central mounting hole 36 fixing member engagement hole 37 inlet 371 Groove 38 Standing wall 39 Injection port 40 Pull stud bolt 41 Through hole 50 Tip 51 Tip mounting screw 60 Nozzle 70 Workpiece bottom surface 71 Workpiece machining wall surface

Claims (5)

An arbor body having a shank portion that is inserted into and held by the spindle of the machine tool and having an attachment fitting portion that is fitted to the rotary tool at the other end portion, and engages with an inner diameter portion of the attachment fitting portion. In an arbor provided with a fixing member,
The arbor body has a hole that penetrates or communicates with an end surface or an outer peripheral surface of the fitting portion from an end surface of the shank portion,
The fixing member has a shaft portion provided on the outer peripheral surface with an engaging portion that engages with an inner diameter portion of the attachment fitting portion at one end portion thereof , and a flange portion at the other end portion,
Arbor, wherein a concave groove of at least one strip on the outer circumferential surface of the shaft portion is extended in the longitudinal direction of the shaft portion so as to open to the end face of the shaft portion with cutting out the engagement portion . Wherein the concave groove that extends in the axial portion of the fixing member cross-sectional shape is square groove shape, or arc shape, or, characterized in that there is a U-shape, or any shape of V-shaped The arbor of claim 1. Arbor according to claim 1 or claim 2, wherein the concave groove that extends in the axial portion of the fixing member is six or less than one. In the rotary tool to be mounted on arbor according to any one of claims 1 to 3,
A central mounting hole that fits into the mounting fitting portion, a counterbored hole corresponding to the flange portion of the fixing member, and a through hole that communicates with the central mounting hole and the counterbored hole;
A suction port that opens on either the inner wall or end face of the central mounting hole or the inner wall of the through hole;
A rotary tool having an injection port that communicates with the suction port and opens toward an outer peripheral direction of the rotary tool. Rotation tool according to claim 4, wherein the total cross-sectional area of the concave groove that extends in the shaft portion of the fixing member is not less than the total cross-sectional area of the injection port.

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