Fixation mechanism

Abstract

To provide a fixation mechanism that can fix both of a hub blade and a hubless blade without exchanging both with a reception flange corresponding to each of both when exchanging the hub blade and the hubless blade that are fitted to a spindle.SOLUTION: A fixation mechanism 1 comprises: a reception flange 10 which has a male thread 15 on an outer periphery of a tip thereof, and supports one side face of a hub blade or a hubless blade 121-2 by a common first support part 16; a presser flange 20 having a second support part 22 which supports the other side face 175 of the hubless blade 121-2, and pinches the same between itself and the reception flange 10; and a nut 30 in which a screw hole 31 having a female thread engaging with the male thread 15 on an inner periphery thereof is formed, and which pinches and fixes the hub blade or the hubless blade 121-2 between itself and the reception flange 10 without or with the presser flange 20.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a fixing mechanism for sandwiching a hub blade or a hubless blade and fixing it to a spindle of a cutting device.

Background Art

[0002] Conventionally, a configuration for sandwiching a cutting blade and attaching it to a spindle of a cutting device is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, specifically, in the case of a hub blade having a circular base formed in a ring shape with an insertion hole and an annular cutting edge protruding from the outer periphery of the circular base, a male screw is formed on the boss portion of the receiving flange fixed to the spindle side. With the insertion hole of the hub blade inserted into the boss portion, the female screw of the nut is fastened to the male screw of the boss portion, and the receiving flange and the nut are clamped and fixed. Further, in the case of a hubless blade having no circular base and having an opening in the center, the opening of the hubless blade is inserted into the boss portion of the receiving flange, and in a state where the pressing flange is further inserted into the boss portion, the nut is fastened through the pressing flange to fix it in a state of being clamped between the receiving flange and the pressing flange.

[0005] In Patent Document 1, the position of the support portion of the receiving flange that contacts and supports the cutting blade is different between the hub blade and the hubless blade. Particularly in the case of the hubless blade, since it is difficult to handle the thin hubless blade, when attaching the hubless blade, the opening of the hubless blade is inserted into the convex portion formed on the flange portion of the receiving flange and temporarily fixed. For this reason, the support portion of the receiving flange that supports the hubless blade is formed on the outer peripheral side of the convex portion, and is located on the outer peripheral side and has a different position from the support portion of the receiving flange when attaching the hub blade. As a result, different receiving flanges are used for the hub blade and the hubless blade. Thus, since different receiving flanges have to be used, when exchanging and using the hub blade and the hubless blade, the operator has to exchange the receiving flange, which is a troublesome problem.

[0006] The present invention has been made in view of such problems, and its object is to provide a fixing mechanism that can fix both the hub blade and the hubless blade without exchanging the corresponding receiving flanges when exchanging the hub blade and the hubless blade mounted on the spindle.

Means for Solving the Problems

[0007] In order to solve the above-described problems and achieve the object, a fixing mechanism of the present invention is a fixing mechanism for fixing a cutting blade to a spindle of a cutting device. The cutting blade is a hub blade having a circular base formed in an annular shape with an insertion hole and an annular cutting edge protruding from an outer periphery of the circular base, or an annular hubless blade having an opening at a center. The fixing mechanism includes a columnar boss portion that can be inserted into either the insertion hole or the opening and has a male screw on an outer periphery of a tip portion, and a flange portion that protrudes radially outward from an axial rear end of the boss portion and supports one side surface of the hub blade or one side surface of the hubless blade with a first support portion. The fixing mechanism further includes a receiving flange having a through hole that can be inserted into the boss portion and has a hole substantially the same size as the insertion hole, and a pressing flange having a second support portion that supports the other side surface opposite to the one side surface of the hubless blade, faces the receiving flange, and sandwiches the hubless blade between the pressing flange and the receiving flange. A nut is provided with a female screw that engages with the male screw of the boss portion formed on an inner periphery thereof, and fixes the hub blade to the receiving flange by sandwiching the hub blade between the nut and the receiving flange in contact with the circular base side of the hub blade, or fixes the hubless blade to the receiving flange by sandwiching the hubless blade between the nut and the receiving flange via the pressing flange. The hub blade or the hubless blade is supported by the common receiving flange.

[0008] The first support portion of the receiving flange may support the hub blade in contact with the annular cutting edge on the outer periphery of the circular base of the hub blade.

[0009] An annular recess is formed on an inner peripheral side of the first support portion in the flange portion of the receiving flange, and an annular protrusion having an outer diameter smaller than an opening of the hubless blade and fitting with the annular recess is formed on an inner peripheral side of the second support portion in the pressing flange. The opening of the hubless blade may be inserted through the annular protrusion to temporarily hold the hubless blade on the pressing flange.

[0010] The flange portion of the receiving flange may have a third support portion that supports the circular base of the hub blade on an inner peripheral side of the first support portion.

[0011] The pressing flange may have an annular recess formed on the inner circumferential side of the second support portion for accommodating the third support portion.

Advantages of the Invention

[0012] In the present invention, when exchanging a hub blade and a hubless blade mounted on a spindle, without replacing the corresponding receiving flanges, by using a common receiving flange that supports one side surface of the hub blade or the hubless blade, and only changing whether or not to use the pressing flange, both the hub blade and the hubless blade can be fixed.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0014] Embodiments (modes for carrying out) of the present invention will be described in detail with reference to the drawings. The present invention is not limited by the content described in the following embodiments. Also, the constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the configurations described below can be combined as appropriate. Also, various omissions, substitutions, or changes in the configuration can be made without departing from the gist of the present invention.

[0015] 〔Embodiment 1〕 The fixing mechanism 1 according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a configuration example of a cutting device 100 in which the fixing mechanism 1 according to Embodiment 1 is used. FIGS. 2 and 3 are both exploded perspective views showing an outline of a main part of a cutting unit 120 in which the fixing mechanism 1 according to Embodiment 1 is used. FIGS. 4 and 5 are both cross-sectional views showing details of a main part of a cutting unit 120 in which the fixing mechanism 1 according to Embodiment 1 is used. FIGS. 2 and 4 respectively show an exploded perspective view and a cross-sectional view of a main part of the cutting unit 120 when a hub blade 121-1 is fixed and mounted to the tip of a spindle 122 of the cutting unit 120 via the fixing mechanism 1 according to Embodiment 1. FIGS. 3 and 5 respectively show an exploded perspective view and a cross-sectional view of a main part of the cutting unit 120 when a hubless blade 121-2 is fixed and mounted to the tip of a spindle 122 of the cutting unit 120 via the fixing mechanism 1 according to Embodiment 1.

[0016] This specification will first describe a cutting device 100 in which the fixing mechanism 1 according to Embodiment 1 is used. As shown in FIG. 1, the cutting device 100 in which the fixing mechanism 1 according to Embodiment 1 is used includes a holding table 110, a cutting unit 120, a moving unit 130, and a control unit 140.

[0017] In Embodiment 1, the workpiece 200 to be machined by cutting with the cutting blade 121 fixed by the fixing mechanism 1 is, for example, a disk-shaped semiconductor device wafer or an optical device wafer having a base material such as silicon, sapphire, silicon carbide (SiC), or gallium arsenide. As shown in FIG. 1, a device 203 is formed in a region of the workpiece 200 partitioned by a plurality of division planned lines 202 formed in a grid pattern on the flat surface 201. In Embodiment 1, the workpiece 200 has an adhesive tape 205 attached to the back surface 204 on the back side of the surface 201, and an annular frame 206 is attached to the outer edge of the adhesive tape 205, but the present invention is not limited thereto. Further, in the present invention, the workpiece 200 may be a rectangular package substrate, a ceramic plate, or a glass plate having a plurality of devices sealed with resin.

[0018] The holding table 110 has a disk-shaped frame body in which a recess is formed, and a disk-shaped suction portion fitted into the recess. The suction portion of the holding table 110 is formed of a porous material such as porous ceramic and is connected to a vacuum suction source (not shown) via a vacuum suction path (not shown). The upper surface of the suction portion of the holding table 110 is a holding surface 111 on which the workpiece 200 is placed and the placed workpiece 200 is sucked and held. In Embodiment 1, the workpiece 200 is placed with the surface 201 facing upward, and the placed workpiece 200 is sucked and held from the back surface 204 side via the adhesive tape 205. The holding surface 111 and the upper surface of the frame body of the holding table 110 are arranged on the same plane and are formed parallel to the XY plane, which is a horizontal plane. The holding table 110 is movable in the X-axis direction parallel to the horizontal direction by the X-axis moving unit 131 of the moving unit 130, and is rotatably provided around an axis parallel to the Z-axis direction, which is the vertical direction and perpendicular to the holding surface 111, by a rotation drive source (not shown).

[0019] As shown in FIGS. 1, 2, 3, 4, and 5, the cutting unit 120 includes a cutting blade 121, a spindle 122, and a spindle housing 123. The spindle 122 is rotatably provided about an axis parallel to the horizontal direction and parallel to the Y-axis direction orthogonal to the X-axis direction, and is rotated about the axis by a motor (not shown) connected to the base end portion on the side opposite to the tip end side (the -Y direction shown in FIGS. 2 to 5) of the spindle 122.

[0020] A screw hole 124 that engages with a bolt 40 described later is formed at the tip of the rotation axis of the spindle 122. The spindle 122 has the tip of the rotation axis inserted through the cutting blade 121 via the fixing mechanism 1 according to Embodiment 1, and the bolt 40 is screwed into the screw hole 124 via the receiving flange 10 of the fixing mechanism 1 according to Embodiment 1 described later and fastened. Thus, the cutting blade 121 is fixed and attached to the tip of the rotation axis via the fixing mechanism 1 according to Embodiment 1.

[0021] In Embodiment 1, the cutting blade 121 is a hub blade 121-1 (see FIGS. 2 and 4) or a hubless blade 121-2 (see FIGS. 3 and 5). As shown in FIGS. 2 and 4, the hub blade 121-1 has a circular base 161 formed in an annular shape with an insertion hole 163, and an annular cutting edge 162 protruding from the outer periphery of the circular base 161. The circular base 161 is formed with two generally planar side surfaces 164 and 165 that are substantially perpendicular to the central axis direction. As shown in FIG. 4, the annular cutting edge 162 has a circular opening 166 formed at the center, which is smaller than the outer diameter of the circular base 161. In Embodiment 1, the hub blade 121-1 has the annular cutting edge 162 formed on one side surface 164 side of the circular base 161. The hub blade 121-1 is attached to the tip of the spindle 122 via the fixing mechanism 1 according to Embodiment 1 through the insertion hole 163, and is rotated around the axis by the spindle 122 serving as the rotation axis, so that the workpiece 200 is machined by the cutting edge 162. The circular base 161 is made of a metal such as an aluminum alloy, for example. The cutting edge 162 is composed of, for example, abrasive grains such as diamond or CBN (Cubic Boron Nitride) and a bonding material (binder) such as metal or resin, has a predetermined thickness, and is formed with two generally planar side surfaces that are substantially perpendicular to the central axis direction.

[0022] As shown in FIGS. 3 and 5, the hubless blade 121-2 has an opening 173 at the center and is formed in an annular shape. The hubless blade 121-2 is formed with two generally planar side surfaces 174 and 175 that are substantially perpendicular to the central axis direction of the opening 173. Substantially, the hubless blade 121-2 is obtained by omitting the circular base 161 in the hub blade 121-1, and the whole is like the cutting edge 162 of the hub blade 121-1. The hubless blade 121-2 is made of, for example, the same material as the cutting edge 162 of the hub blade 121-1 and is formed to have a predetermined thickness. The hubless blade 121-2 is attached to the tip of the spindle 122 via the fixing mechanism 1 according to Embodiment 1 through the opening 173, and is rotated around the axis by the spindle 122 serving as the rotation axis, so that the workpiece 200 is machined.

[0023] Since the hub blade 121-1 has a circular base 161 and is easier for an operator to handle by hand than the hubless blade 121-2, the hubless blade 121-2 is formed to have a thickness greater than the thickness of the cutting edge 162 of the hub blade 121-1. Also, the hubless blade 121-2 is formed such that its inner diameter is larger than the inner diameter of the insertion hole 163 of the circular base 161 and smaller than the inner diameter of the circular opening 166 of the cutting edge 162.

[0024] The spindle housing 123 exposes the tip of the spindle 122 and houses the portion except the tip, so that the spindle 122 is inserted therethrough. The spindle housing 123 supports the spindle 122 so as to be rotatable about the axis.

[0025] The spindle housing 123 is provided so as to be movable in the Y-axis direction by the Y-axis moving unit 132 of the moving unit 130 and movable in the Z-axis direction by the Z-axis moving unit 133 of the moving unit 130 with respect to the workpiece 200 held on the holding table 110. The spindle 122 rotatably supported by the spindle housing 123 and the cutting blade 121 attached to the tip of the spindle 122 move together with the spindle housing 123.

[0026] The cutting device 100 sets the cutting blade 121 attached to the tip of the spindle 122 by the moving unit 130 at a predetermined position with respect to the workpiece 200 held on the holding table 110, and relatively moves the cutting blade 121 along the division planned line 202 with respect to the workpiece 200 while rotating the cutting blade 121, thereby cutting the workpiece 200 along the division planned line 202 with the cutting blade 121.

[0027] The control unit 140 controls the operations of the respective components of the cutting device 100 to cause the cutting device 100 to perform a cutting process by the cutting unit 120. In Embodiment 1, the control unit 140 includes a computer system. The computer system included in the control unit 140 has an arithmetic processing unit having a microprocessor such as a CPU (Central Processing Unit), a storage device having a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory), and an input / output interface device. The arithmetic processing unit of the control unit 140 performs arithmetic processing according to a computer program stored in the storage device of the control unit 140, and outputs a control signal for controlling the cutting device 100 to each component of the cutting device 100 via the input / output interface device of the cutting device 100.

[0028] Next, this specification will describe the fixing mechanism 1 according to Embodiment 1. As shown in FIGS. 2, 3, 4, and 5, the fixing mechanism 1 according to Embodiment 1 includes a receiving flange 10, a pressing flange 20, a nut 30, and a bolt 40. As shown in FIGS. 2 and 4, the fixing mechanism 1 according to Embodiment 1 fixes and mounts a hub blade 121-1 to the tip of the spindle 122 of the cutting unit 120 by the receiving flange 10 and the nut 30, and as shown in FIGS. 3 and 5, a hubless blade 121-2 is fixed and mounted to the tip of the spindle 122 of the cutting unit 120 by the receiving flange 10, the pressing flange 20, and the nut 30. The receiving flange 10, the pressing flange 20, and the nut 30 are all made of a metal such as an aluminum alloy similar to the circular base 161, for example.

[0029] The receiving flange 10 and the nut 30 used when fixing and mounting the hub blade 121-1 to the tip of the spindle 122 of the cutting unit 120, and the receiving flange 10 and the nut 30 used when fixing and mounting the hubless blade 121-2 to the tip of the spindle 122 of the cutting unit 120 are all common to each other. The pressing flange 20 is not used when fixing and mounting the hub blade 121-1 to the tip of the spindle 122 of the cutting unit 120 in the first embodiment, and is used only when fixing and mounting the hubless blade 121-2 to the tip of the spindle 122 of the cutting unit 120.

[0030] The receiving flange 10 is formed in a generally axially symmetric shape except for the male screw 15 portion. As shown in FIGS. 2, 3, 4, and 5, the receiving flange 10 includes a columnar boss portion 11 extending in the axial direction, a disk-shaped flange portion 12 protruding radially outward from the axial rear end opposite to the axial front end of the boss portion 11, and a cylindrical portion 13 protruding further toward the axial rear end side of the flange portion 12. The boss portion 11, the flange portion 12, and the cylindrical portion 13 constituting the receiving flange 10 are all formed in a generally axially symmetric shape.

[0031] The receiving flange 10 is integrally formed such that the boss portion 11, the flange portion 12, and the cylindrical portion 13 have their respective central axes overlapping each other. The receiving flange 10 has a mounting hole 14 formed on the inner side thereof so as to fit (fit together) without a gap to the outer periphery of the tip of the spindle 122 over the boss portion 11, the flange portion 12, and the cylindrical portion 13.

[0032] The receiving flange 10 is mounted on the tip of the spindle 122 such that the axially rear end side where the cylindrical portion 13 is formed faces the base end side of the spindle 122 and the spindle housing 123, and the mounting hole 14 is fitted onto the outer periphery of the tip of the spindle 122. After the receiving flange 10 is mounted on the tip of the spindle 122 in this way, a bolt 40 (described later) is inserted into the mounting hole 14 from the axially front end side (boss portion 11 side) of the receiving flange 10 and screwed into a threaded hole 124 formed at the tip of the rotation axis of the spindle 122 and tightened, whereby the receiving flange 10 is mounted and fixed to the tip of the rotation axis of the spindle 122.

[0033] When the receiving flange 10 is mounted on the tip of the spindle 122 in this way, the central axis of the receiving flange 10 (the central axis of the boss portion 11, the flange portion 12, and the cylindrical portion 13) coincides with the rotation axis of the spindle 122, is arranged along the Y-axis direction shown in FIGS. 2 to 5, and the axially front end direction (boss portion 11 side of the receiving flange 10) and the axially rear end direction (cylindrical portion 13 side of the receiving flange 10) are directed in the -Y direction and the +Y direction shown in FIGS. 2 to 5, respectively.

[0034] The outer diameter of the boss portion 11 is formed smaller than the inner diameter of the insertion hole 163 formed in the circular base 161 of the hub blade 121-1 and the inner diameter of the opening 173 of the hubless blade 121-2. In this way, the boss portion 11 is formed in a shape and size that can be inserted into either the insertion hole 163 of the hub blade 121-1 or the opening 173 of the hubless blade 121-2. Specifically, the outer periphery of the portion on the axially rear end side of the boss portion 11 is formed in a shape and size that fits into the inner periphery of the insertion hole 163 formed in the circular base 161 of the hub blade 121-1 and the inner periphery of the through hole 21 formed in the pressing flange 20 (described later).

[0035] The boss portion 11 supports, from the inner peripheral side toward the outer peripheral side, the inner peripheral surface of the insertion hole 163 of the hub blade 121-1 inserted and fitted into the boss portion 11 or the inner peripheral surface of the through hole 21 of the pressing flange 20 inserted and fitted into the boss portion 11 on the outer peripheral surface of the portion on the rear end side in the axial direction. The boss portion 11 is formed with a male screw 15 that engages with a screw hole 31 having a female screw formed on the inner periphery of the nut 30 on the outer periphery of the portion on the front end side in the axial direction, which is the tip portion.

[0036] The hub blade 121-1 is mounted on the receiving flange 10 by inserting the boss portion 11 into the insertion hole 163 with one side surface 164 of the circular base 161 formed with the annular cutting edge 162 facing the receiving flange 10 side and fitting the insertion hole 163 and the portion on the rear end side in the axial direction of the boss portion 11. The hubless blade 121-2 is mounted on the receiving flange 10 together with the pressing flange 20 by inserting the boss portion 11 into the opening 173, further inserting the boss portion 11 into the through hole 21 of the pressing flange 20, and fitting the through hole 21 and the portion on the rear end side in the axial direction of the boss portion 11.

[0037] When the hub blade 121-1 or the hubless blade 121-2 is mounted on the receiving flange 10 in this way, the central axis (the central axis of the insertion hole 163 or the opening 173) of the hub blade 121-1 or the hubless blade 121-2 coincides with the central axis of the receiving flange 10 and is arranged along the Y-axis direction shown in FIGS. 2 to 5, and the axial front end direction (the other side surface 165, 175 side) and the axial rear end direction (one side surface 164, 174 side) are directed toward the -Y direction and the +Y direction shown in FIGS. 2 to 5, respectively.

[0038] The outer diameter of the flange portion 12 is formed to be larger than the inner diameter of the insertion hole 163 formed in the circular base 161 of the hub blade 121-1 and the inner diameter of the opening 173 of the hubless blade 121-2, and smaller than the outer diameter of the cutting edge 162 of the hub blade 121-1 and the outer diameter of the hubless blade 121-2. When the hub blade 121-1 or the hubless blade 121-2 is attached to the receiving flange 10, the surface on the axially front end side of the flange portion 12 faces axially along with one side surface 164 facing the axially rear end side of the circular base 161 of the attached hub blade 121-1 or one side surface 174 facing the axially rear end side of the attached hubless blade 121-2.

[0039] The flange portion 12 has a first support portion 16 that supports one side surface 164 of the hub blade 121-1 attached to the receiving flange 10 or one side surface 174 of the hubless blade 121-2 attached to the receiving flange 10 from the axially rear end side toward the axially front end side on the surface on the axially front end side. The first support portion 16 is formed in an annular shape when viewed axially on the radially outer peripheral side of the surface on the axially front end side of the flange portion 12. The first support portion 16 protrudes toward the axially front end side from the region adjacent to the inner peripheral side of the region where the first support portion 16 is formed on the surface on the axially front end side of the flange portion 12, and the protruding portion is formed in an annular planar shape parallel to the surface orthogonal to the axial direction. In Embodiment 1, the first support portion 16 is formed to protrude most highly toward the axially front end side on the surface on the axially front end side of the flange portion 12.

[0040] The receiving flange 10 supports one side surface 164 of the hub blade 121-1 attached to the receiving flange 10 or one side surface 174 of the hubless blade 121-2 attached to the receiving flange 10 from the axially rear end side toward the axially front end side by the annular first support portion 16 of the flange portion 12. The receiving flange 10 supports the hub blade 121-1 or the hubless blade 121-2 with the tip of the cutting edge 162 of the hub blade 121-1 or the tip of the hubless blade 121-2 protruding radially outward from the outer periphery of the flange portion 12.

[0041] In Embodiment 1, the flange portion 12 is further formed such that its outer diameter is larger than the inner diameter of the circular opening 166 of the cutting edge 162 of the hub blade 121-1. The first support portion 16 contacts the cutting edge 162 of the hub blade 121-1 and supports the cutting edge 162 from the axially rear end side toward the axially front end side, and also supports one side surface 164 of the circular base 161 of the hub blade 121-1 from the axially rear end side toward the axially front end side via the cutting edge 162 of the hub blade 121-1.

[0042] Therefore, in Embodiment 1, whether the hub blade 121-1 is attached to the tip of the spindle 122 via the fixing mechanism 1 or the hubless blade 121-2 is attached, the first support portion 16 of the flange portion 12 supports the axially rear end side of the cutting edge 162 portion of the hub blade 121-1 or the axially rear end side of the cutting edge portion of the hubless blade 121-2, respectively. Thus, the position of the cutting edge of the cutting blade 121 in the Y-axis direction for cutting the workpiece 200 is the same. Therefore, in Embodiment 1, when exchanging the cutting blade 121 attached to the tip of the spindle 122 between the hub blade 121-1 and the hubless blade 121-2, the position of the cutting edge of the cutting blade 121 in the Y-axis direction for cutting the workpiece 200 does not change. Therefore, operations such as adjusting the supply position of the cutting fluid according to the position of the cutting edge of the cutting blade 121 in the Y-axis direction for cutting the workpiece 200 can be omitted, and the labor involved in such adjustment operations can be suppressed.

[0043] In Embodiment 1, on the axially distal end surface, an annular recess 17 is formed on the radially inner circumferential side of the first support portion 16 in the flange portion 12. The annular recess 17 is formed in an annular shape when viewed axially. The annular recess 17 is recessed toward the axially rear end side from the region adjacent to the outer circumferential side of the region where the annular recess 17 is formed on the axially distal end surface of the flange portion 12, and is recessed toward the axially rear end side from the region adjacent to the inner circumferential side of the region where the annular recess 17 is formed, and is formed. Since the annular recess 17 does not contact one side surface 164 of the circular base 161 of the hub blade 121-1 attached to the receiving flange 10, it does not prevent the first support portion 16 from supporting one side surface 164 of the hub blade 121-1 or from contacting and supporting the cutting edge 162 of the hub blade 121-1.

[0044] The annular recess 17 is further formed such that the diameter of the inner circumferential side end (inner circumferential end) is larger than the outer diameter of the boss portion 11, and the diameter of the outer circumferential side end (outer circumferential end) is formed to be equal to the inner diameter of the opening 173 of the hubless blade 121-2. The annular recess 17 is formed in a shape that fits into the annular convex portion 23 of the pressing flange 20 after being inserted through the opening 173 of the hubless blade 121-2.

[0045] The cylindrical portion 13 covers a portion that is not covered on the outer circumferential side by the boss portion 11 and the flange portion 12 at the exposed portion (exposed portion) of the tip of the spindle 122 from the spindle housing 123. The cylindrical portion 13 is a portion formed according to the axial length of the exposed portion of the tip of the spindle 122, and may be omitted when the exposed portion of the tip of the spindle 122 is short.

[0046] The pressing flange 20 is formed in a generally axially symmetric shape. The pressing flange 20 is formed in an annular shape with a through-hole 21. The inner diameter of the through-hole 21 of the pressing flange 20 is formed as a hole larger than the outer diameter of the boss portion 11 and can be inserted into the boss portion 11. Also, the inner diameter of the through-hole 21 of the pressing flange 20 is formed as a hole having substantially the same (equivalent) size as the inner diameter of the insertion hole 163 of the hub blade 121-1. The inner periphery of the through-hole 21 of the pressing flange 20 is formed in a shape and size that fits onto the outer periphery of the portion on the axially rear end side of the boss portion 11 when inserted into the boss portion 11 in the same manner as the inner periphery of the insertion hole 163 of the hub blade 121-1.

[0047] The pressing flange 20 is inserted into the boss portion 11 of the receiving flange 10 where the hubless blade 121-2 has been previously mounted, and is fitted onto the outer periphery of the portion on the axially rear end side of the boss portion 11, so that it is mounted on the receiving flange 10 together with the hubless blade 121-2, and sandwiches the hubless blade 121-2 between the pressing flange 20 and the receiving flange 10, and is mounted on the tip of the spindle 122 together with the receiving flange 10 and the hubless blade 121-2.

[0048] When the pressing flange 20 is mounted on the receiving flange 10 in this way, the central axis of the pressing flange 20 (the central axis of the through-hole 21) coincides with the central axis of the receiving flange 10, is arranged along the Y-axis direction shown in FIGS. 2 to 5, and the axially front end direction (nut 30 side) and the axially rear end direction (receiving flange 10 side) are directed in the -Y direction and the +Y direction shown in FIGS. 2 to 5, respectively.

[0049] The outer diameter of the pressing flange 20 is formed to be larger than the inner diameter of the opening 173 of the hubless blade 121-2 and smaller than the outer diameter of the hubless blade 121-2. The outer diameter of the pressing flange 20 is formed to be approximately the same as the outer diameter of the flange portion 12, for example. The pressing flange 20 is formed in an annular planar shape such that the surface on the axially front end side is generally parallel to the surface orthogonal to the axial direction. When the pressing flange 20 is attached to the receiving flange 10 together with the hubless blade 121-2, the surface on the axially rear end side faces the other side surface 175 directed toward the axially front end side of the attached hubless blade 121-2 along the axial direction.

[0050] The pressing flange 20 has a second support portion 22 on the surface on the axially rear end side for supporting the other side surface 175 of the hubless blade 121-2, which is opposite to one side surface 174 of the hubless blade 121-2, from the axially front end side toward the axially rear end side. The second support portion 22 is formed in an annular shape when viewed from the axial direction on the radially outer peripheral side of the surface on the axially rear end side of the pressing flange 20. The second support portion 22 protrudes toward the axially rear end side from the region adjacent to the inner peripheral side of the region where the second support portion 22 is formed on the surface on the axially rear end side of the pressing flange 20, and the protruding portion is formed in an annular planar shape parallel to the surface orthogonal to the axial direction. The second support portion 22 is formed to protrude most toward the axially rear end side on the surface on the axially rear end side of the pressing flange 20, excluding the annular convex portion 23 described later.

[0051] The pressing flange 20 supports the other side surface 175 of the hubless blade 121-2 from the axially front end side toward the axially rear end side by the second support portion 22. The pressing flange 20 supports the hubless blade 121-2 in a state where the blade tip of the hubless blade 121-2 protrudes radially outward from the outer periphery of the pressing flange 20.

[0052] The second support portion 22 of the pressing flange 20, when the pressing flange 20 is mounted on the tip of the spindle 122 together with the receiving flange 10 and the hubless blade 121-2 such that the hubless blade 121-2 is sandwiched between the pressing flange 20 and the receiving flange 10, faces axially along the other side surface 175 of the hubless blade 121-2 and axially faces the first support portion 16 of the flange portion 12 of the receiving flange 10 via the hubless blade 121-2. The pressing flange 20 sandwiches and supports the hubless blade 121-2 axially along with the first support portion 16 of the receiving flange 10 at the second support portion 22.

[0053] In Embodiment 1, the pressing flange 20 further has an annular convex portion 23 protruding axially rearward formed on the radially inner peripheral side of the second support portion 22 on the axially rear end side surface. The annular convex portion 23 is formed annularly when viewed axially. The annular convex portion 23 protrudes axially rearward from a region adjacent to the outer peripheral side of the region where the annular convex portion 23 is formed on the axially rear end side surface of the pressing flange 20, and protrudes axially rearward from a region adjacent to the inner peripheral side of the region where the annular convex portion 23 is formed, and is formed. The annular convex portion 23 is formed to protrude axially rearward from the second support portion 22 on the axially rear end side surface of the pressing flange 20.

[0054] The annular convex portion 23 is formed in a shape and size that fits into the annular concave portion 17 of the flange portion 12 of the receiving flange 10. When the pressing flange 20 is mounted on the tip of the spindle 122 together with the receiving flange 10 and the hubless blade 121-2 such that the hubless blade 121-2 is sandwiched between the pressing flange 20 and the receiving flange 10, the annular convex portion 23 faces axially along the annular concave portion 17 of the flange portion 12 of the receiving flange 10 and fits into the annular concave portion 17. By fitting the annular convex portion 23 into the annular concave portion 17, the pressing flange 20 can be prevented from being displaced radially relative to the receiving flange 10.

[0055] In Embodiment 1, also, the annular convex portion 23 is formed such that the diameter of the inner peripheral side end is larger than the outer diameter of the boss portion 11, and the diameter of the outer peripheral side end is smaller than the inner diameter of the opening 173 of the hubless blade 121-2. Thus, the annular convex portion 23 is formed in a shape and size that can be inserted into the opening 173 of the hubless blade 121-2. Therefore, the annular convex portion 23 does not prevent the second support portion 22 from supporting the other side surface 175 of the hubless blade 121-2.

[0056] In Embodiment 1, the annular convex portion 23 is further formed in a shape and size such that the outer peripheral end fits into the inner periphery of the opening 173 of the hubless blade 121-2. The annular convex portion 23 supports the inner peripheral surface of the opening 173 of the hubless blade 121-2 fitted to the annular convex portion 23 from the inner peripheral side toward the outer peripheral side at the outer peripheral end. The pressing flange 20 temporarily holds the hubless blade 121-2 by inserting the opening 173 of the hubless blade 121-2 through the annular convex portion 23 and supporting the inner peripheral surface of the opening 173 of the hubless blade 121-2 at the outer peripheral end of the annular convex portion 23. In Embodiment 1, after the annular convex portion 23 is inserted through the opening 173 of the hubless blade 121-2 and supports the inner peripheral surface of the opening 173 of the hubless blade 121-2 at the outer peripheral end of the annular convex portion 23, it is fitted into the annular recess 17.

[0057] The nut 30 is formed in a generally axially symmetric shape except for the female screw portion of the screw hole 31. The nut 30 has a screw hole 31 formed with a female screw on the inner periphery that engages with the male screw 15 of the boss portion 11. The nut 30 is formed annularly with the screw hole 31. The surface on the axially rear end side of the nut 30 is formed in a generally annular planar shape parallel to the surface orthogonal to the axial direction. The outer diameter of the nut 30 is larger than the outer diameter of the boss portion 11 of the receiving flange 10, and smaller than the outer diameter of the flange portion 12 of the receiving flange 10, the outer diameter of the pressing flange 20, and the outer diameter of the other side surface 165 of the circular base 161 of the hub blade 121-1.

[0058] As shown in FIGS. 2 and 4, after the hub blade 121-1 is mounted on the receiving flange 10 mounted at the tip of the spindle 122, the nut 30 is inserted into the screw hole 31 from the axially front end side of the hub blade 121-1. The boss portion 11 of the receiving flange 10 is inserted into the screw hole 31 and screwed and fastened to the male screw 15 of the boss portion 11 of the receiving flange 10. Thus, the axially rear end side surface of the nut 30 is in contact with the other side surface 165 on the circular base 161 side of the hub blade 121-1, and the hub blade 121-1 is sandwiched between the axially rear end side surface of the nut 30 and the first support portion 16 of the receiving flange 10, thereby fixing the hub blade 121-1 to the receiving flange 10.

[0059] As shown in FIGS. 3 and 5, after the hubless blade 121-2 is mounted on the receiving flange 10 mounted at the tip of the spindle 122 together with the pressing flange 20, the nut 30 is inserted into the screw hole 31 from the axially front end side of the hubless blade 121-2. The boss portion 11 of the receiving flange 10 is inserted into the screw hole 31 and screwed and fastened to the male screw 15 of the boss portion 11 of the receiving flange 10. Thus, the axially rear end side surface of the nut 30 is in contact with the axially front end side surface of the pressing flange 20, and the hubless blade 121-2 is sandwiched between the axially rear end side surface of the nut 30 and the first support portion 16 of the receiving flange 10 via the second support portion 22 of the pressing flange 20, thereby fixing the hubless blade 121-2 to the receiving flange 10.

[0060] The bolt 40 is formed with a screw groove that engages with the screw hole 124 formed at the tip of the rotation axis of the spindle 122. After the hub blade 121-1 or the hubless blade 121-2 is fixed to the receiving flange 10 by the nut 30, the bolt 40 is inserted into the mounting hole 14 from the axially front end side and screwed and fastened to the screw hole 124 formed at the tip of the rotation axis of the spindle 122, thereby mounting and fixing the receiving flange 10 to the tip of the spindle 122. Also, via the receiving flange 10, the hub blade 121-1 or the hubless blade 121-2 fixed to the receiving flange 10 by the nut 30 is mounted and fixed to the tip of the spindle 122.

[0061] In this way, the fixing mechanism 1 supports the other side surface 165 and one side surface 164 of the hub blade 121-1 respectively with the surface on the axial rear end side of the nut 30 and the first support portion 16 of the receiving flange 10, and clamps the hub blade 121-1 between the surface on the axial rear end side of the nut 30 and the first support portion 16 of the receiving flange 10, thereby mounting and fixing the hub blade 121-1 to the tip of the spindle 122. The fixing mechanism 1 supports the other side surface 175 and one side surface 174 of the hubless blade 121-2 respectively with the second support portion 22 of the pressing flange 20 and the first support portion 16 of the receiving flange 10, and clamps the hubless blade 121-2 between the second support portion 22 of the pressing flange 20 and the first support portion 16 of the receiving flange 10, thereby mounting and fixing the hubless blade 121-2 to the tip of the spindle 122. The fixing mechanism 1 can thus mount and fix both the hub blade 121-1 and the hubless blade 121-2 to the tip of the spindle 122 using the same receiving flange 10.

[0062] The operation of the fixing mechanism 1 according to Embodiment 1 having the above configuration will be described. When removing the hub blade 121-1 mounted on the tip of the spindle 122 via the fixing mechanism 1 according to Embodiment 1 and newly mounting the hubless blade 121-2, first, loosen and remove the bolt 40 screwed and fastened into the screw hole 124, loosen and remove the nut 30 screwed and fastened to the male screw 15 of the receiving flange 10, remove the hub blade 121-1 supported by the first support portion 16 of the receiving flange 10, and leave the receiving flange 10 mounted on the tip of the spindle 122 as it is. Next, mount a new hubless blade 121-2 together with the pressing flange 20 on the receiving flange 10 left as it is, screw and fasten the screw hole 31 of the nut 30 removed earlier to the male screw 15 of the receiving flange 10 left earlier, screw and fasten the bolt 40 removed earlier into the screw hole 124, thereby mounting and fixing the new hubless blade 121-2 to the tip of the spindle 122.

[0063] When removing the hubless blade 121-2 attached to the tip of the spindle 122 via the fixing mechanism 1 according to Embodiment 1 and newly attaching the hub blade 121-1, first, loosen and remove the bolt 40 screwed and fastened into the screw hole 124, loosen and remove the nut 30 screwed and fastened onto the male screw 15 of the receiving flange 10, remove the pressing flange 20 that clamped the hubless blade 121-2 together with the receiving flange 10, remove the hubless blade 121-2 supported by the first support portion 16 of the receiving flange 10, and leave the receiving flange 10 attached to the tip of the spindle 122 as it is. Next, attach the new hub blade 121-1 to the receiving flange 10 left as it is, screw and fasten the screw hole 31 of the nut 30 removed earlier onto the male screw 15 of the receiving flange 10 left earlier, screw and fasten the bolt 40 removed earlier into the screw hole 124, and attach and fix the new hub blade 121-1 to the tip of the spindle 122.

[0064] As described above, for the cutting blade 121 attached to the tip of the spindle 122 via the fixing mechanism 1, the fixing mechanism 1 according to Embodiment 1 can replace the hub blade 121-1 and the hubless blade 121-2 using the same receiving flange 10 without removing the receiving flange 10 attached to the tip of the spindle 122.

[0065] Conventionally, the support portion of the receiving flange that supports the hubless blade 121-2 is located on the outer peripheral side and has a different position from the support portion of the receiving flange that supports the hub blade 121-1. However, in the fixing mechanism 1 according to Embodiment 1 having the above configuration, the position of the support portion of the receiving flange 10 that supports one side surface 164 of the hub blade 121-1 is moved to the outer peripheral side and made to coincide with the position of the support portion of the receiving flange 10 that supports one side surface 174 of the hubless blade 121-2, and the support portion of the receiving flange 10 that supports one side surface 164 of the hub blade 121-1 and the support portion of the receiving flange 10 that supports one side surface 174 of the hubless blade 121-2 are made into a common first support portion 16. By doing so, when exchanging the hub blade 121-1 and the hubless blade 121-2 mounted on the spindle 122, without exchanging the corresponding receiving flanges, by using the common receiving flange 10 having the common first support portion 16 and only changing whether or not the pressing flange 20 is used, the fixing mechanism 1 according to Embodiment 1 can achieve the effect of fixing both the hub blade 121-1 and the hubless blade 121-2.

[0066] In addition, with respect to the fixing mechanism 1 according to Embodiment 1, as the position of the support portion of the receiving flange 10 that supports one side surface 164 of the hub blade 121-1 has moved to the outer peripheral side compared to the conventional case, the first support portion 16 of the receiving flange 10 contacts and supports the annular cutting edge 162 on the outer periphery of the circular base 161 of the hub blade 121-1. Therefore, for the fixing mechanism 1 according to Embodiment 1, whether the hub blade 121-1 is attached to the tip of the spindle 122 via the fixing mechanism 1 or the hubless blade 121-2 is attached, the first support portion 16 of the flange portion 12 supports the axially rear end side of the cutting edge 162 portion of the hub blade 121-1 or the axially rear end side of the cutting edge portion of the hubless blade 121-2, respectively. As a result, the position of the cutting edge of the cutting blade 121 in the Y-axis direction for cutting the workpiece 200 becomes equal. Thereby, when exchanging the cutting blade 121 attached to the tip of the spindle 122 between the hub blade 121-1 and the hubless blade 121-2, the fixing mechanism 1 according to Embodiment 1 does not change the position of the cutting edge of the cutting blade 121 in the Y-axis direction for cutting the workpiece 200. Thus, operations such as adjusting the supply position of the cutting fluid according to the position of the cutting edge of the cutting blade 121 in the Y-axis direction for cutting the workpiece 200 can be omitted, and the labor involved in such adjustment operations can be suppressed.

[0067] Further, in the fixing mechanism 1 according to Embodiment 1, an annular recess 17 is formed on the inner peripheral side of the first support portion 16 in the flange portion 12 of the receiving flange 10. On the pressing flange 20, an annular convex portion 23 is formed on the inner peripheral side of the second support portion 22, which has an outer diameter smaller than the opening 173 of the hubless blade 121-2 and fits with the annular recess 17. The opening 173 of the hubless blade 121-2 is inserted through the annular convex portion 23 to temporarily hold the hubless blade 121-2 on the pressing flange 20. Thus, in the fixing mechanism 1 according to Embodiment 1, the opening of the hubless blade 121-2 was conventionally inserted into the convex portion formed on the flange portion of the receiving flange for temporary fixing, but the annular convex portion 23 for temporary fixing is changed to be provided on the pressing flange 20 side, and an annular recess 17 is provided at a position corresponding to the annular convex portion 23 of the flange portion 12 of the receiving flange 10. Therefore, while maintaining the function of temporarily holding the hubless blade 121-2, it is possible to support one side surface 164 of the hub blade 121-1 and one side surface 174 of the hubless blade 121-2 with the common first support portion 16 of the common receiving flange 10.

[0068] 〔Embodiment 2〕 The fixing mechanism 1-2 according to Embodiment 2 of the present invention will be described with reference to the drawings. FIGS. 6 and 7 are both cross-sectional views showing details of the main part of the cutting unit 120 in which the fixing mechanism 1-2 according to Embodiment 2 is used. FIG. 6 shows a cross-sectional view of the main part of the cutting unit 120 when the hub blade 121-1 is fixed and mounted via the fixing mechanism 1-2 according to Embodiment 2 at the tip of the spindle 122 of the cutting unit 120. FIG. 7 shows a cross-sectional view of the main part of the cutting unit 120 when the hubless blade 121-2 is fixed and mounted via the fixing mechanism 1-2 according to Embodiment 2 at the tip of the spindle 122 of the cutting unit 120. In FIGS. 6 and 7, the same parts as those in Embodiment 1 are denoted by the same reference numerals and the description thereof is omitted.

[0069] The fixing mechanism 1-2 according to Embodiment 2 is obtained by changing the receiving flange 10 in Embodiment 1 to the receiving flange 10-2 shown in FIGS. 6 and 7, and changing the pressing flange 20 to the pressing flange 20-2 shown in FIG. 7, and the other configurations are the same as those in Embodiment 1.

[0070] As shown in FIGS. 6 and 7, the receiving flange 10-2 has a third support portion 18 that supports the circular base 161 of the hub blade 121-1 on the surface of the axial front end side of the flange portion 12, further on the inner peripheral side in the radial direction than the first support portion 16. The third support portion 18 is formed in an annular shape when viewed from the axial direction. That is, the receiving flange 10-2, on the surface of the axial front end side of the flange portion 12, in order from the inner peripheral side in the radial direction, has a third support portion 18 that supports one side surface 164 of the circular base 161 of the hub blade 121-1 from the axial rear end side toward the axial front end side, an annular concave portion 17 that fits into the annular convex portion 23 of the pressing flange 20-2, and a first support portion 16 that supports one side surface 174 of the hubless blade 121-2 from the axial rear end side toward the axial front end side. In the receiving flange 10-2, with the formation of the third support portion 18, the radial length of the annular concave portion 17 is formed shorter compared to the receiving flange 10.

[0071] The third support portion 18 protrudes toward the axial front end side from a region adjacent to the inner peripheral side of the region where the third support portion 18 is formed on the surface of the axial front end side of the flange portion 12, and the protruding portion is formed in an annular planar shape parallel to the plane orthogonal to the axial direction. In Embodiment 2, the third support portion 18 is higher than the first support portion 16 and protrudes most toward the axial front end side on the surface of the axial front end side of the flange portion 12.

[0072] The third support portion 18 is formed such that the diameter of the inner peripheral side end is larger than the outer diameter of the boss portion 11, and the diameter of the outer peripheral side end is smaller than the inner diameter of the circular opening 166 of the cutting edge 162 of the hub blade 121-1 and the inner diameter of the opening 173 of the hubless blade 121-2. Therefore, the third support portion 18 can directly contact and support one side surface 164 of the circular base 161 of the hub blade 121-1 without passing through the cutting edge 162 of the hub blade 121-1. Also, the third support portion 18 does not prevent the first support portion 16, which is lower than the third support portion 18, from supporting one side surface 174 of the hubless blade 121-2.

[0073] As shown in FIG. 6, different from the receiving flange 10, the receiving flange 10-2 does not contact the mounted hub blade 121-1 at the first support portion 16, but at the third support portion 18 of the flange portion 12 formed on the inner peripheral side of the first support portion 16, directly contacts one side surface 164 of the circular base 161 of the mounted hub blade 121-1 without passing through the cutting edge 162 of the hub blade 121-1, and supports it from the axial rear end side toward the axial front end side. On the other hand, as shown in FIG. 7, similar to the receiving flange 10, the receiving flange 10-2 supports one side surface 174 of the mounted hubless blade 121-2 from the axial rear end side toward the axial front end side at the first support portion 16 of the flange portion 12.

[0074] The third support portion 18 is further formed such that the diameter of the outer peripheral side end is smaller than the outer diameter of the nut 30. Therefore, when the hub blade 121-1 is fixed to the receiving flange 10-2 by the nut 30, the third support portion 18 of the receiving flange 10-2 faces the surface on the axial rear end side of the nut 30 along the axis. In the fixing mechanism 1-2 according to the second embodiment, in this way, the support region that supports one side surface 164 of the hub blade 121-1 by the third support portion 18 and the support region that supports the other side surface 165 of the hub blade 121-1 by the surface on the axial rear end side of the nut 30 overlap in the positional relationship as viewed from the axis, so that the possibility of deformation of the hub blade 121-1 caused by support by the nut 30 and the receiving flange 10-2 can be suppressed.

[0075] As shown in Fig. 7, on the axially rear end side surface, the pressing flange 20-2 further has an annular recess 24 formed on the radially inner peripheral side of the second support portion 22 and the annular convex portion 23 to accommodate the third support portion 18 of the receiving flange 10-2. The annular recess 24 is formed annularly when viewed axially. That is, on the axially rear end side surface, the pressing flange 20-2 has, in order from the radially inner peripheral side, an annular recess 24 for accommodating the third support portion 18 of the receiving flange 10-2, an annular convex portion 23 that fits into the annular recess 17 of the receiving flange 10-2, and a second support portion 22 that supports the other side surface 175 of the hubless blade 121-2 from the axially front end side toward the axially rear end side. In the pressing flange 20-2, with the formation of the annular recess 24, the radially length of the annular convex portion 23 is formed shorter compared to the pressing flange 20.

[0076] The annular recess 24 is recessed toward the axially front end side compared to the region adjacent to the outer peripheral side of the region where the annular recess 24 is formed on the axially rear end side surface of the pressing flange 20-2, and is also recessed toward the axially front end side compared to the region adjacent to the inner peripheral side of the region where the annular recess 24 is formed. The annular recess 24 is formed in a shape and size to accommodate the third support portion 18 of the receiving flange 10-2. When the pressing flange 20-2 is mounted on the tip of the spindle 122 together with the receiving flange 10-2 and the hubless blade 121-2 so as to sandwich the hubless blade 121-2 between the pressing flange 20-2 and the receiving flange 10-2, it faces the third support portion 18 of the flange portion 12 of the receiving flange 10-2 along the axial direction and accommodates the third support portion 18.

[0077] Unlike the fixing mechanism 1, the fixing mechanism 1-2 according to Embodiment 2 supports the other side surface 165 and one side surface 164 of the hub blade 121-1 by the surface on the axial rear end side of the nut 30 and the third support portion 18 of the receiving flange 10-2, respectively, and sandwiches the hub blade 121-1 between the surface on the axial rear end side of the nut 30 and the third support portion 18 of the receiving flange 10-2, thereby mounting and fixing the hub blade 121-1 to the tip of the spindle 122. On the other hand, similar to the fixing mechanism 1, the fixing mechanism 1-2 according to Embodiment 2 supports the other side surface 175 and one side surface 174 of the hubless blade 121-2 by the second support portion 22 of the pressing flange 20-2 and the first support portion 16 of the receiving flange 10-2, respectively, and sandwiches the hubless blade 121-2 between the second support portion 22 of the pressing flange 20-2 and the first support portion 16 of the receiving flange 10-2, thereby mounting and fixing the hubless blade 121-2 to the tip of the spindle 122. The fixing mechanism 1-2 according to Embodiment 2 can mount and fix both the hub blade 121-1 and the hubless blade 121-2 to the tip of the spindle 122 using the same receiving flange 10-2 in this way.

[0078] Similar to the fixing mechanism 1, for the cutting blade 121 mounted on the tip of the spindle 122 via the fixing mechanism 1-2 according to Embodiment 2, the hub blade 121-1 and the hubless blade 121-2 can be exchanged using the same receiving flange 10-2 without removing the receiving flange 10-2 mounted on the tip of the spindle 122.

[0079] The fixing mechanism 1-2 according to Embodiment 2 having the above configuration is provided with both a third support portion 18 that supports one side surface 164 of the circular base 161 of the hub blade 121-1 on the axially front end side surface of the flange portion 12 of the receiving flange 10-2, and a first support portion 16 that supports one side surface 174 of the hubless blade 121-2. The third support portion 18 is provided protruding toward the axially front end side on the radially inner peripheral side of the first support portion 16. The fixing mechanism 1-2 according to Embodiment 2 thereby has the effect that when exchanging the hub blade 121-1 and the hubless blade 121-2 mounted on the spindle 122, by using the common receiving flange 10-2 provided with the first support portion 16 and the third support portion 18 without exchanging the corresponding receiving flanges, and only changing the presence or absence of use of the pressing flange 20-2, both the hub blade 121-1 and the hubless blade 121-2 can be fixed.

[0080] Also, since the fixing mechanism 1-2 according to Embodiment 2 is provided at a position axially opposite to the axially rear end side surface of the nut 30 along the axis, the support region that supports one side surface 164 of the hub blade 121-1 by the third support portion 18 and the support region that supports the other side surface 165 of the hub blade 121-1 by the axially rear end side surface of the nut 30 overlap when viewed axially. Thus, the possibility of deformation of the hub blade 121-1 caused by support by the nut 30 and the receiving flange 10-2 can be suppressed.

[0081] Furthermore, the fixing mechanism 1-2 according to Embodiment 2 is further formed with an annular recess 24 that houses the third support portion 18 on the axially rear end side surface of the pressing flange 20-2. The fixing mechanism 1-2 according to Embodiment 2 can thereby more reliably suppress the possibility that the third support portion 18 obstructs the support of the hubless blade 121-2 by the second support portion 22 of the pressing flange 20-2 when mounting and fixing the hubless blade 121-2 to the spindle 122.

[0082] The fixing mechanism 1-2 according to Embodiment 2, similar to Embodiment 1, has an annular recess 17 formed in the flange portion 12 of the receiving flange 10-2, an annular protrusion 23 formed in the pressing flange 20-2, and the opening 173 of the hubless blade 121-2 is inserted through the annular protrusion 23 to temporarily hold the hubless blade 121-2 on the pressing flange 20. Therefore, similar to Embodiment 1, the fixing mechanism 1-2 according to Embodiment 2 can support one side surface 164 of the hub blade 121-1 and one side surface 174 of the hubless blade 121-2 with the common receiving flange 10-2 while maintaining the function of temporarily holding the hubless blade 121-2.

[0083] 〔Embodiment 3〕 The fixing mechanism 1-3 according to Embodiment 3 of the present invention will be described with reference to the drawings. FIGS. 8 and 9 are both cross-sectional views showing details of the main part of the cutting unit 120 in which the fixing mechanism 1-3 according to Embodiment 3 is used. FIG. 8 shows a cross-sectional view of the main part of the cutting unit 120 when the hub blade 121-1 is fixed and mounted via the fixing mechanism 1-3 according to Embodiment 3 at the tip of the spindle 122 of the cutting unit 120. FIG. 9 shows a cross-sectional view of the main part of the cutting unit 120 when the hubless blade 121-2 is fixed and mounted via the fixing mechanism 1-3 according to Embodiment 3 at the tip of the spindle 122 of the cutting unit 120. In FIGS. 8 and 9, the same reference numerals are given to the same parts as in Embodiments 1 and 2, and the description thereof is omitted.

[0084] The fixing mechanism 1-3 according to Embodiment 3 is obtained by changing the receiving flanges 10, 10-2 in Embodiments 1 and 2 to the receiving flange 10-3 shown in FIGS. 8 and 9, and changing the pressing flanges 20, 20-2 to the pressing flange 20-3 shown in FIG. 9, and the other configurations are the same as those in Embodiments 1 and 2.

[0085] The receiving flange 10-3 is obtained by providing an annular end face 19 instead of the annular recess 17 on the axially front end side surface of the flange portion 12 in the receiving flange 10-2 of the second embodiment as shown in FIGS. 8 and 9. The annular end face 19 is formed in an annular shape when viewed axially. That is, on the axially front end side surface of the flange portion 12, the receiving flange 10-3 is formed with a third support portion 18, an annular end face 19, and a first support portion 16 in order from the radially inner peripheral side.

[0086] The region where the annular end face 19 is formed is recessed toward the axially rear end side from the third support portion 18 adjacent to the inner peripheral side of the region where the annular end face 19 is formed on the axially front end side surface of the flange portion 12, and protrudes toward the axially front end side from the first support portion 16 adjacent to the outer peripheral side of the region where the annular end face 19 is formed. The annular end face 19 is the peripheral surface on the outer peripheral side in the region where the annular end face 19 is formed, and is formed in an annular shape along the circumferential direction. Therefore, the region where the annular end face 19 is formed does not prevent the third support portion 18 from supporting one side surface 164 of the hub blade 121-1.

[0087] The region where the annular end face 19 is formed is formed such that the diameter of the inner peripheral side end and the diameter of the outer peripheral side end are the same as the diameter of the inner peripheral side end and the diameter of the outer peripheral side end of the annular convex portion 23 in the first and second embodiments. Therefore, the region where the annular end face 19 is formed does not prevent the first support portion 16 from supporting one side surface 174 of the hubless blade 121-2.

[0088] The annular end face 19 is formed in a shape and size that fits into the inner circumference of the opening 173 of the hubless blade 121-2. The annular end face 19 supports the inner circumferential surface of the opening 173 of the hubless blade 121-2 fitted to the annular end face 19 from the inner circumferential side toward the outer circumferential side. The receiving flange 10-3 thus temporarily holds the hubless blade 121-2 by inserting the opening 173 of the hubless blade 121-2 through the region where the annular end face 19 is formed and supporting the inner circumferential surface of the opening 173 of the hubless blade 121-2 with the annular end face 19. In Embodiment 3, after the annular end face 19 supports the inner circumferential surface of the opening 173 of the hubless blade 121-2, it is housed in the annular recess 24.

[0089] The pressing flange 20-3 is obtained by omitting the annular convex portion 23 on the surface on the rear end side in the axial direction as shown in FIG. 9 in the pressing flange 20-2 of Embodiment 2 and expanding the annular recess 24 in the radial direction to the region where the annular convex portion 23 was formed. That is, on the surface on the rear end side in the axial direction, the pressing flange 20-3 is formed with an annular recess 24 and a second support portion 22 in order from the inner circumferential side in the radial direction.

[0090] In Embodiment 3, the annular recess 24 is formed in a shape and size that houses the region where the third support portion 18 and the annular end face 19 of the receiving flange 10-3 are formed. When the pressing flange 20-3 sandwiches the hubless blade 121-2 between it and the receiving flange 10-3 and is attached to the tip of the spindle 122 together with the receiving flange 10-3 and the hubless blade 121-2, the annular recess 24 faces the region where the third support portion 18 and the annular end face 19 of the flange portion 12 of the receiving flange 10-3 are formed along the axial direction and houses the region where the third support portion 18 and the annular end face 19 are formed.

[0091] The fixing mechanism 1-3 according to Embodiment 3, similar to the fixing mechanism 1-2 of Embodiment 2, supports the other side surface 165 and one side surface 164 of the hub blade 121-1 with the surface on the axially rear end side of the nut 30 and the third support portion 18 of the receiving flange 10-3, respectively, and sandwiches the hub blade 121-1 between the surface on the axially rear end side of the nut 30 and the third support portion 18 of the receiving flange 10-3, thereby mounting and fixing the hub blade 121-1 to the tip of the spindle 122. Also, the fixing mechanism 1-3 according to Embodiment 3, similar to the fixing mechanism 1-2 of Embodiment 2, supports the other side surface 175 and one side surface 174 of the hubless blade 121-2 with the second support portion 22 of the pressing flange 20-3 and the first support portion 16 of the receiving flange 10-3, respectively, and sandwiches the hubless blade 121-2 between the second support portion 22 of the pressing flange 20-3 and the first support portion 16 of the receiving flange 10-3, thereby mounting and fixing the hubless blade 121-2 to the tip of the spindle 122. The fixing mechanism 1-3 according to Embodiment 3 can mount and fix both the hub blade 121-1 and the hubless blade 121-2 to the tip of the spindle 122 by using the same receiving flange 10-3 in this way.

[0092] The fixing mechanism 1-3 according to Embodiment 3, similar to the fixing mechanisms 1, 1-2, can replace the hub blade 121-1 and the hubless blade 121-2 using the same receiving flange 10-3 without removing the receiving flange 10-3 mounted on the tip of the spindle 122 for the cutting blade 121 mounted on the tip of the spindle 122 via the fixing mechanism 1-3.

[0093] The fixing mechanism 1-3 according to Embodiment 3 having the above configuration, similar to Embodiment 2, when exchanging the hub blade 121-1 and the hubless blade 121-2 attached to the spindle 122, without exchanging the corresponding receiving flanges, by using the common receiving flange 10-3 provided with the first support portion 16 and the third support portion 18, and only changing the presence or absence of the use of the pressing flange 20-3, both the hub blade 121-1 and the hubless blade 121-2 can be fixed, achieving the above-described operational effect. Also, the fixing mechanism 1-3 according to Embodiment 3, similar to Embodiment 2, when attaching and fixing the hubless blade 121-2 to the spindle 122, can more reliably suppress the possibility that the third support portion 18 may interfere with the support of the hubless blade 121-2 by the second support portion 22 of the pressing flange 20-3.

[0094] Further, the fixing mechanism 1-3 according to Embodiment 3, similar to Embodiment 2, has the third support portion 18 provided at a position axially opposed to the rear end side surface of the nut 30 along the axial direction. Therefore, the support region for supporting one side surface 164 of the hub blade 121-1 by the third support portion 18 and the support region for supporting the other side surface 165 of the hub blade 121-1 by the rear end side surface of the nut 30 in the axial direction overlap when viewed from the axial direction, thereby suppressing the possibility of deformation of the hub blade 121-1 by being supported by the nut 30 and the receiving flange 10-3.

[0095] The fixing mechanism 1-3 according to Embodiment 3, in the fixing mechanisms 1, 1-2 of Embodiments 1 and 2, instead of the annular recess 17 formed in the receiving flange 10, 10-2 and the annular protrusion 23 formed in the pressing flange 20, 20-2, an annular end face 19 is formed on the receiving flange 10-3, and the annular recess 24 formed in the pressing flange 20-3 is expanded to a shape and size capable of accommodating the third support portion 18 of the receiving flange 10-3 and the region where the annular end face 19 is formed. The opening 173 of the hubless blade 121-2 is inserted through the annular end face 19 to temporarily hold the hubless blade 121-2 on the receiving flange 10-3. Thereby, while maintaining the function of temporarily holding the hubless blade 121-2, the fixing mechanism 1-3 according to Embodiment 3 can support one side surface 164 of the hub blade 121-1 and one side surface 174 of the hubless blade 121-2 with the common receiving flange 10-3.

[0096] Note that the present invention is not limited to the above embodiments. That is, various modifications can be made and implemented without departing from the gist of the present invention.

Explanation of Reference Numerals

[0097] 1, 1-2, 1-3 Fixing mechanism 10, 10-2, 10-3 Receiving flange 11 Boss portion 12 Flange portion 15 Male screw 16 First support portion 17, 24 Annular recess 18 Third support portion 20, 20-2, 20-3 Pressing flange 21 Through hole 22 Second support portion 23 Annular protrusion 30 Nut 31 Screw hole 100 Cutting device 121 Cutting blade 122 Spindle 121-1 Hub blade 121-2 Hubless blade 161 Circular abutment 162 Cutting edge 163 Insertion hole 164, 174 One side surface 165, 175 The other side surface 173 Opening

Claims

1. A fixing mechanism for fixing a cutting blade to a spindle of a cutting device, wherein the cutting blade is a hub blade having a circular base formed in an annular shape with an insertion hole and an annular cutting edge protruding from the outer periphery of the circular base, or an annular hubless blade having an opening at the center, a cylindrical boss portion that can be inserted into either the insertion hole or the opening and has a male screw on the outer periphery of the tip portion, and a flange portion that protrudes radially outward from the axial rear end of the boss portion and supports one side surface of the hub blade or one side surface of the hubless blade with a first support portion, a receiving flange having; a through hole having a hole substantially the same size as the insertion hole and capable of being inserted into the boss portion, and a second support portion that supports the other side surface opposite to the one side surface of the hubless blade, faces the receiving flange, and sandwiches the hubless blade between the receiving flange and the pressing flange, a pressing flange having; a nut having a female screw thread engaging with the male screw of the boss portion formed on the inner periphery, and fixing the hub blade to the receiving flange by sandwiching the hub blade between the receiving flange in contact with the circular base side of the hub blade, or fixing the hubless blade to the receiving flange by sandwiching the hubless blade between the receiving flange via the pressing flange; comprising, The fixing mechanism is characterized in that the hub blade or the hubless blade is supported by the common receiving flange.

2. The fixing mechanism according to claim 1, wherein the first support portion of the receiving flange supports the cutting edge of the outer periphery of the circular base of the hub blade in contact therewith.

3. An annular recess is formed on the inner peripheral side of the first support portion in the flange portion of the receiving flange, an annular convex portion having an outer diameter smaller than the opening of the hubless blade and fitting with the annular recess is formed on the inner peripheral side of the second support portion of the pressing flange, The fixing mechanism according to claim 1 or claim 2, wherein the opening of the hubless blade is inserted through the annular convex portion to temporarily hold the hubless blade to the pressing flange.

4. The fixing mechanism according to claim 1, wherein the flange portion of the receiving flange has a third support portion that supports the circular base of the hub blade on the inner peripheral side of the first support portion.

5. The holding flange is the fixing mechanism according to claim 4, characterized in that an annular recess for accommodating the third support portion is formed on the inner peripheral side of the second support portion.

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