Grinding wheel jig and grinding wheel case

Abstract

To provide a grinding wheel jig capable of inserting a bolt from a lower side of a mount when mounting a grinding wheel to the mount.SOLUTION: A grinding wheel jig to be used when a grinding wheel having an annular grindstone part disposed on one surface side of an annular base is mounted to a lower surface side of a disk-shaped mount attached to a lower end portion of a spindle includes: a bottomed cylindrical grindstone accommodating part that accommodates the annular grindstone part; an annular base accommodating part that is located on a side opposite to a bottom portion of the grindstone accommodating part in a height direction of the grindstone accommodating part, has an outside diameter greater than an outside diameter of the grindstone accommodating part, and is capable of accommodating at least a part of the base; and a plurality of cylindrical bolt accommodating parts provided at a bottom portion of the base accommodating part and each capable of accommodating a head part of a bolt. Each of the bolt accommodating parts has, at a bottom portion thereof, an opening in which a fastening tool is insertable into the head part of the bolt.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a grinding wheel jig used when mounting a grinding wheel on the underside of a disk-shaped mount attached to the lower end of a spindle, and a grinding wheel case that houses the grinding wheel. [Background technology]

[0002] A grinding device is used when grinding a workpiece such as a silicon wafer. The grinding device is equipped with a grinding unit including a cylindrical spindle. The spindle is disposed, for example, substantially parallel to the vertical direction, and a disk-shaped mount (wheel mount) is fixed to the lower end of the spindle. An annular grinding wheel is attached to the lower surface side of the mount.

[0003] In a typical grinding apparatus used to grind the entire back side of a workpiece (i.e., the side opposite to the front side on which the device is formed), a typical grinding wheel having a circular base (wheel base) is attached to the mount described above.

[0004] The outer periphery of the mount has a plurality of through holes formed along the circumferential direction of the mount, and the outer periphery of one side of the base of a typical grinding wheel (i.e., the side opposite to the other side on which the grinding wheel is provided) has a plurality of screw holes formed along the circumferential direction of the base to correspond to each of the through holes.

[0005] When a typical grinding wheel is attached to a mount, bolts are inserted into the mount's through holes from above, and the bottom ends of the bolts are fastened to the threaded holes of the grinding wheel. When the mount is removed from the grinding wheel, the bolts are removed from above the mount.

[0006] When attaching or detaching such a conventional grinding wheel to or from a mount, it is known to use a jig having an annular recess that can cover the entire side and bottom of the grinding wheel in order to protect the grinding stone, etc. (See, for example, Patent Document 1).

[0007] By the way, a grinding method called TAIKO (registered trademark) is known, in which a circular predetermined area on the back side of a workpiece corresponding to a device area provided on the front side of the workpiece is ground, but the outer periphery of the back side is left unground, thereby forming a disk-shaped recess on the back side. When performing this grinding, a dedicated grinding device different from a normal grinding device is used.

[0008] In this dedicated grinding device, a plurality of screw holes are provided along the circumferential direction of the mount on the outer periphery of the lower surface side of the mount, and the base (wheel base) of the grinding wheel attached to the mount has an annular flange, and a plurality of through holes are provided along the circumferential direction of the flange on the outer periphery of the lower surface side of the flange.

[0009] A ring-shaped grindstone attachment part having a smaller diameter than the flange is fixed to the underside of the flange, closer to the center of the flange than the through holes, and is generally concentric with the flange. A plurality of segment-shaped grinding wheels are arranged on the underside of the grindstone attachment part along the circumferential direction of the base.

[0010] When attaching such a grinding wheel to a mount, first place the grinding wheel below the mount and align the through holes in the flange with the screw holes in the mount. In this state, bolts are inserted into the mount from the underside of the flange and each bolt is tightened into the screw holes in the mount. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] JP 2011-121128 A Summary of the Invention [Problem to be solved by the invention]

[0012] However, if a jig is used that covers the entire side and bottom of the grinding wheel, as is the case with conventional grinding wheel jigs, then even if one attempts to insert a bolt into the through hole and screw hole from below the mount, the jig will block the insertion of the bolt.

[0013] On the other hand, if a jig is not used, the worker's hand may come into contact with the grinding wheel, causing injury to the worker, or the grinding wheel may be damaged by contact with a tool. In addition, grinding chips attached to the grinding wheel may fall and contaminate the inside of the grinding device.

[0014] The present invention has been made in consideration of the above problems, and has an object to provide a jig for a grinding wheel that allows a bolt to be inserted from below the mount when attaching the grinding wheel to the mount. [Means for solving the problem]

[0015] According to one aspect of the present invention, there is provided a grinding wheel jig used when mounting a grinding wheel having an annular grinding stone portion arranged on one side of a circular base, to the underside of a disk-shaped mount attached to the lower end of a spindle, the grinding wheel jig comprising: a bottomed cylindrical grinding stone accommodating portion that accommodates the annular grinding stone portion; an annular base accommodating portion that is located on the opposite side of the bottom of the grinding stone accommodating portion in the height direction of the grinding stone accommodating portion, has an outer diameter larger than the outer diameter of the grinding stone accommodating portion, and is capable of accommodating at least a portion of the base; and a plurality of cylindrical bolt accommodating portions each provided at the bottom of the base accommodating portion and capable of accommodating the head of a bolt, each bolt accommodating portion having an opening at the bottom through which a fastening tool can be inserted into the head of the bolt.

[0016] Preferably, an inner peripheral side surface of the side portion of the base receiving portion comes into contact with an outer peripheral side surface of the mount when the base received in the base receiving portion is brought into contact with the lower surface of the mount.

[0017] According to another aspect of the present invention, there is provided a grinding wheel case that accommodates a grinding wheel having an annular grinding stone portion arranged on one side of a circular base, the grinding wheel case comprising: a bottomed cylindrical grinding stone accommodating portion that accommodates the annular grinding stone portion; an annular base accommodating portion that is located on the opposite side of the bottom of the grinding stone accommodating portion in the height direction of the grinding stone accommodating portion, has an outer diameter larger than the outer diameter of the grinding stone accommodating portion, and is capable of accommodating at least a portion of the base; and a plurality of cylindrical bolt accommodating portions that are each provided at the bottom of the base accommodating portion and are capable of accommodating the head of a bolt, each bolt accommodating portion comprising a grinding wheel jig having an opening at the bottom through which a fastening tool can be inserted into the head of the bolt, and a lid portion that covers the opening of the base accommodating portion. Effect of the Invention

[0018] A grinding wheel jig according to one aspect of the present invention has a grindstone housing that houses an annular grindstone. An annular base housing is located on the opposite side of the grindstone housing from the bottom in the height direction of the grindstone housing. The base housing has an outer diameter larger than the outer diameter of the grindstone housing and is capable of housing at least a portion of the base.

[0019] The base housing has a bottom provided with a plurality of cylindrical bolt housings, each having an insertion hole at its bottom into which a fastening tool can be inserted to the head of the bolt. With the grinding wheel housed in the grinding wheel jig, the grinding wheel can be attached to the mount by inserting a bolt into the through hole of the base from below the mount and fastening the bolt into the screw hole of the mount.

[0020] Furthermore, since the grindstone is housed in the grindstone housing, it is possible to prevent the worker from coming into contact with the grindstone, damage to the grindstone by tools, and the falling of grinding chips from the grindstone or base during attachment and detachment operations. [Brief description of the drawings]

[0021] [Figure 1] FIG. [Diagram 2]FIG. 2(A) is a perspective view of the workpiece, and FIG. 2(B) is a cross-sectional view of the workpiece after grinding. [Diagram 3] FIG. 3(A) is a perspective view of the upper side of the jig, and FIG. 3(B) is an enlarged view of the dashed line area of ​​FIG. 3(A). [Figure 4] FIG. 4(A) is a perspective view of the lower side of the jig, and FIG. 4(B) is an enlarged view of the dashed line area of ​​FIG. 4(A). [Diagram 5] FIG. 2 is a bottom perspective view of the grinding wheel housed in the jig. [Figure 6] FIG. 2 is a top perspective view of a grinding wheel housed in a jig. [Figure 7] FIG. 13 is a partial cross-sectional side view showing how the grinding wheel is attached to the mount. [Figure 8] FIG. [Figure 9] FIG. 11 is a side view of a jig according to a second embodiment. [Figure 10] FIG. 10(A) is a side view of the mount, FIG. 10(B) is a partially sectional side view of the mount, and FIG. 10(C) is a bottom view of the mount. [Figure 11] FIG. 11(A) is a diagram showing the state in which the grinding wheel is raised, and FIG. 11(B) is a diagram showing the state in which the grinding wheel is rotated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] An embodiment according to one aspect of the present invention will be described with reference to the accompanying drawings. First, a grinding unit 2 to which a grinding wheel 10 is attached will be described. Fig. 1 is a side view of the grinding unit 2. Note that the Z-axis direction shown in Fig. 1 is, for example, parallel to the vertical direction.

[0023] The grinding unit 2 is used when grinding the back surface 11b side of a disk-shaped workpiece 11 (see FIG. 2(A)). FIG. 2(A) is a perspective view of the workpiece 11. The workpiece 11 is, for example, a disk-shaped silicon wafer. A plurality of planned dividing lines 13 are set in a lattice pattern on the front surface 11a side of the workpiece 11.

[0024] Devices 15 such as ICs (Integrated Circuits) are formed in each region partitioned by the plurality of planned division lines 13. Surrounding the device region 15a in which the plurality of devices 15 are formed is a substantially flat peripheral excess region 15b in which no devices 15 are formed.

[0025] The grinding unit 2 is used to grind a circular region on the back surface 11b of the workpiece 11 corresponding to the device region 15a to form a recess 11c (see FIG. 2(B)). FIG. 2(B) is a cross-sectional view of the workpiece 11 after grinding.

[0026] Returning to Fig. 1, the grinding unit 2 has a cylindrical spindle housing 4. The spindle housing 4 is movable along the Z-axis direction by a ball screw type grinding feed unit (not shown). A part of a cylindrical spindle 6 is rotatably accommodated in the spindle housing 4.

[0027] A rotation drive source (not shown) such as a motor is provided at the upper end of the spindle 6. A lower end 6a of the spindle 6 protrudes downward from the bottom of the spindle housing 4, and a central portion of an upper surface 8a side of a disk-shaped mount 8 is attached to this lower end 6a.

[0028] A plurality of screw holes 8c are provided at approximately equal intervals along the circumferential direction of the mount 8 on the lower surface 8b side of the mount 8. In this embodiment, four screw holes 8c are provided along the circumferential direction of the mount 8. However, three screw holes 8c are shown in FIG.

[0029] An annular grinding wheel 10 is attached to the lower surface 8b side of the mount 8. The grinding wheel 10 is made of a metal material such as an aluminum alloy or stainless steel. The grinding wheel 10 has an annular flange 12 having approximately the same diameter as the outer diameter of the mount 8.

[0030] A plurality of through holes 12c are formed in the outer periphery of the flange 12, penetrating from the upper surface 12a to the lower surface 12b of the flange 12. The plurality of through holes 12c are spaced apart at approximately equal intervals along the circumferential direction of the flange 12.

[0031] In this embodiment, four through holes 12c are provided along the circumferential direction of the flange 12. However, three through holes 12c are shown in Fig. 1. After the flange 12 is placed on the mount 8 so that the screw holes 8c and the through holes 12c correspond one-to-one, the shaft portion 14a of the bolt 14 is inserted into the through holes 12c, and the shaft portion 14a is fastened to the screw hole 8c.

[0032] In addition, a counterbore portion 12d capable of accommodating a head portion 14b of the bolt 14 is formed on the lower surface 12b side of the through hole 12c. The bolt 14 in this embodiment is a hexagonal socket bolt having a hexagonal hole formed in the head portion 14b. The outer diameter of the shaft portion 14a is 5 mm.

[0033] On the underside 12b of the flange 12, inside the outer periphery of the flange 12, an annular grindstone attachment portion 16 made of the same metal material as the flange 12 is fixed. The grindstone attachment portion 16 has an outer diameter smaller than that of the flange 12 and is disposed substantially concentrically with the flange 12.

[0034] An upper surface 16a side of the grindstone mounting portion 16 is fixed to a lower surface 12b side of the flange 12. In this specification, the grindstone mounting portion 16 and the flange 12 are collectively referred to as a base (wheel base) 17.

[0035] A plurality of segment-shaped grinding wheels (grinding wheel portions) 18 are arranged annularly along the circumferential direction of the grinding wheel mounting portion 16 on the lower surface (one surface) 16b side of the grinding wheel mounting portion 16. The annular grinding wheel portion may be a single circular (so-called continuous type) grinding wheel.

[0036] When mounting the grinding wheel 10 on the mount 8, first, as shown in FIG. 1, the grinding wheel 10 is placed below the mount 8 and the through hole 12c of the flange 12 is aligned with the screw hole 8c of the mount 8.

[0037] In this state, bolts 14 are inserted into the through holes 12c from the underside 12b of the flange 12, and each bolt 14 is fastened to a screw hole 8c of the mount 8. In this embodiment, when mounting the grinding wheel 10 to the mount 8, a jig (grinding wheel jig) 20 into which the bolts 14 can be inserted from below the mount 8 is used.

[0038] 3(A) is a perspective view of the upper side of the jig 20. The jig 20 of this embodiment is formed of a resin having translucency, but the jig 20 may be formed of a transparent resin, or may be formed of a resin having no translucency or other materials. The jig 20 of this embodiment can be created by, for example, a 3D printer, but may also be created by a device other than a 3D printer.

[0039] The jig 20 has a cylindrical grindstone accommodating portion 22 with a bottom. The cylindrical outer diameter of the grindstone accommodating portion 22 in this embodiment is 102 mm, and the length of the grindstone accommodating portion 22 in the height direction 20a of the jig 20 (i.e., the height direction of the base accommodating portion 24) is 37 mm.

[0040] The grinding wheel housing section 22 houses a plurality of grinding wheels 18 by covering the entire outer peripheral side surface 18a and the lower surface 18b (see FIG. 1) of each grinding wheel 18. A substantially semi-cylindrical recess 22b is formed on the bottom 22a side of the grinding wheel housing section 22 in a manner recessed toward the center side in the radial direction of the grinding wheel housing section 22.

[0041] In this embodiment, four recesses 22b are formed at approximately equal intervals along the circumferential direction of the grindstone housing portion 22. However, the number of recesses 22b is not limited to four. Note that, when the grinding wheel 10 is housed in the jig 20, the lower surface 18b of the grinding stone 18 does not contact the upper surface 22c of the recesses 22b (see FIG. 6).

[0042] The recess 22b is provided for the purpose of facilitating handling of the jig 20 when an operator holds the jig 20 by hand. For example, the recess 22b makes it easier to move or rotate the jig 20.

[0043] In the height direction 20a of the jig 20, a top portion located on the opposite side to the bottom portion 22a is connected to an annular base housing portion 24 having an outer diameter larger than the outer diameter of the grindstone housing portion 22. The base housing portion 24 has an annular bottom portion 24a connected to the outside of the top portion of the grindstone housing portion 22.

[0044] The bottom portion 24a has an outer periphery provided with an annular side portion 24b protruding in the height direction 20a. The side portion 24b and the bottom portion 24a each have approximately the same thickness as the grindstone accommodating portion 22.

[0045] An opening 24c is formed on the top side of the base accommodating portion 24. In this embodiment, the outer diameter of the base accommodating portion 24 is 124 mm, and the length of the base accommodating portion 24 in the height direction 20a is 20 mm.

[0046] A plurality of cylindrical bolt accommodating portions 26 are provided at approximately equal intervals in the circumferential direction of the base accommodating portion 24 on the bottom 24a of the base accommodating portion 24. In this embodiment, four bolt accommodating portions 26 are provided, but the number of bolt accommodating portions 26 may be changed as appropriate depending on the number of screw holes 8c.

[0047] When the jig 20 is viewed in plan, one bolt accommodating portion 26 is located between two recesses 22b. The bolt accommodating portion 26 includes a cylindrical recess having approximately the same diameter as the outer diameter of the head 14b of the bolt 14. The bottom 26a of each bolt accommodating portion 26 protrudes toward the bottom 22a of the grindstone accommodating portion 22 beyond the bottom 24a of the base accommodating portion 24.

[0048] As shown in Fig. 3(B), head 14b is supported by bottom 26a of bolt accommodating portion 26, and when head 14b is entirely housed in bolt accommodating portion 26, shaft 14a protrudes in height direction 20a from bolt accommodating portion 26. Fig. 3(B) is an enlarged view of the dashed-dotted line area in Fig. 3(A), and shows the state in which bolt 14 is housed in bolt accommodating portion 26.

[0049] A circular opening 26b (see FIGS. 4A and 4B) is formed in the bottom 26a of the bolt accommodating portion 26. For example, a hexagonal wrench (fastening tool) 30 (see FIG. 7) is inserted into the hexagonal hole in the head 14b of the bolt 14 through the opening 26b.

[0050] In this embodiment, a hexagonal hole is formed in head 14b, but if a cross recess or a square hole is formed in head 14b instead of a hexagonal hole, a fastening tool is appropriately selected depending on the shape of the hole.

[0051] Fig. 4(A) is a perspective view of the lower side of jig 20, and Fig. 4(B) is an enlarged view of the dashed line area in Fig. 4(A). For convenience, Fig. 4(B) shows bolt 14 accommodated in bolt accommodating portion 26 with head 14b in contact with bottom portion 26a.

[0052] The grinding wheel 10 is housed in the jig 20 with the bolts 14 inserted into the through holes 12c. Fig. 5 is a bottom perspective view of the grinding wheel 10 housed in the jig 20.

[0053] As shown in FIG. 5, when the grinding wheel 10 is accommodated in the jig 20, the lower surface 12b of the flange 12 is supported by the bottom 24a of the base accommodating portion 24, and the head 14b of the bolt 14 is supported by the bottom 26a of the bolt accommodating portion 26.

[0054] At this time, the upper surface 12a of the flange 12 does not protrude from the opening 24c as shown in Fig. 6. Also, the outer peripheral side surface of the flange 12 contacts the inner peripheral side surface 24d of the side portion 24b of the base receiving portion 24 (see Fig. 7).

[0055] Fig. 6 is a top perspective view of the grinding wheel 10 accommodated in the jig 20. As shown in Fig. 6, when the bolt 14 is accommodated in the bolt accommodating portion 26, the shaft portion 14a of the bolt 14 does not protrude from the upper surface 12a.

[0056] Next, a procedure for mounting the grinding wheel 10 housed in the jig 20 to the mount 8 will be described. First, an operator holds the jig 20 in his / her hand and adjusts the orientation so that the screw holes 8c and the through holes 12c correspond one-to-one. Then, the operator raises the jig 20 and brings the upper surface 12a of the flange 12 into contact with the lower surface 8b of the mount 8.

[0057] At this time, the upper part of the inner peripheral side surface 24d of the side portion 24b comes into contact with the outer peripheral side surface 8d of the mount 8, so that the center of rotation of the grinding wheel 10 can be easily aligned with the center of rotation of the mount 8. In addition, by aligning the position of the bolt accommodating portion 26 with the screw hole 8c when the mount 8 is viewed from the side, the bolt 14 can be easily aligned with the screw hole 8c.

[0058] Next, a hexagonal wrench 30 is inserted into the opening 26b, and the bolts 14 are fastened to the screw holes 8c, thereby mounting the grinding wheel 10 to the mount 8 (see FIG. 7). FIG. 7 is a partial cross-sectional side view showing the mounting of the grinding wheel 10 to the mount 8.

[0059] After the grinding wheel 10 is attached, the jig 20 is removed from the grinding wheel 10. In this embodiment, with the grinding wheel 10 housed in the jig 20, the grinding wheel 10 can be attached to the mount 8 by fastening the bolt 14 into the screw hole 8c from below the mount 8.

[0060] Furthermore, since multiple grinding wheels 18 are stored in the grinding wheel storage section 22, it is possible to prevent the worker from coming into contact with the grinding wheels 18, damage to the grinding wheels 18 by tools, and falling of grinding chips from the grinding wheels 18 and base 17 when attaching or removing the grinding wheel 10.

[0061] When removing the grinding wheel 10, the procedure is reversed from that of mounting. That is, with the jig 20 mounted on the grinding wheel 10 from below, the bolts 14 are removed. Then, with the grinding wheel 10 housed in the jig 20, the grinding wheel 10 is removed from the mount 8.

[0062] The grinding wheel 10 removed from the mount 8 is stored in a case (grinding wheel case) 34 that is composed of a jig 20 and a disk-shaped lid portion 32, as shown in Fig. 8. Fig. 8 is a partial cross-sectional side view of the case 34.

[0063] The lid portion 32 in this embodiment is formed from the same material as the jig 20, but the lid portion 32 may be formed from a material different from that of the jig 20. The lid portion 32 has a disk-shaped recess 32a on the inside.

[0064] Since the diameter 32b of the recess 32a is approximately the same as the outer diameter of the side portion 24b of the base housing portion 24, the lid portion 32 can be fitted to the upper side of the base housing portion 24 so as to close the opening 24c of the base housing portion 24. By closing the opening 24c with the lid portion 32, the grinding wheel 10 and the multiple bolts 14 can be housed integrally within the case 34.

[0065] In the recess 32a, a plurality of spacers 32c, each of which is made of resin and has a cylindrical shape, are arranged along the circumferential direction of the lid portion 32. In this embodiment, four spacers 32c are arranged at approximately equal intervals along the circumferential direction of the lid portion 32. However, in FIG. 8, three spacers 32c are shown.

[0066] The height (thickness) of each spacer 32c corresponds to a depth 36 (see FIG. 6) from the opening 24c to the upper surface 12a when the grinding wheel 10 is accommodated in the jig 20. The diameter of the spacer 32c in this embodiment is larger than the through hole 12c of the flange 12 so that the spacer 32c does not fit into the through hole 12c.

[0067] By providing the spacer 32c, it is possible to suppress movement of the grinding wheel 10 housed in the case 34 within the case 34. Note that, instead of the cylindrical spacer 32c, one ring-shaped spacer (not shown) may be provided concentrically with the cover portion 32, or multiple arc-shaped spacers (not shown) may be provided along the circumferential direction of the cover portion 32.

[0068] Incidentally, grinding wheels 10 are available in a number of different diameters depending on the diameter of the workpiece 11. Also, jigs 20 of different diameters are used depending on the diameter of the grinding wheel 10. Therefore, if the jig 20 is used only when the grinding wheel 10 is attached to or detached from the mount 8, it may become necessary to search for the jig 20 that matches the diameter of the grinding wheel 10 each time.

[0069] However, as described above, if the grinding wheel 10 is stored in the case 34, the grinding wheel 10 can be attached to the mount 8 using the jig 20 having a diameter corresponding to the grinding wheel 10 simply by removing the lid 32, which has the advantage of facilitating management of the jig 20. Another advantage is that the bolts 14 can be prevented from being lost.

[0070] An engagement mechanism (not shown) such as a screw cap may be provided on the inner peripheral side surface of the lid portion 32 and the outer peripheral side surface of the side portion 24b to fix the lid portion 32 and the base housing portion 24 by rotation. Also, instead of the engagement mechanism, another fixing mechanism may be provided.

[0071] Next, a second embodiment will be described. Fig. 9 is a side view of a jig (grinding wheel jig) 40 according to the second embodiment. Below, differences between the jig 40 and the jig 20 will be mainly described.

[0072] The depth of the recess of the bolt accommodating portion 26 of the jig 40 is shallower than that of the bolt accommodating portion 26 of the first embodiment. Therefore, the tip of the shaft portion 14a of the bolt 14 accommodated in the bolt accommodating portion 26 of the second embodiment protrudes from the upper surface 12a of the flange 12.

[0073] A plurality of rectangular cutouts 24e are formed in the side portion 24b of the base housing portion 24. Since each cutout 24e is disposed at a position corresponding to the bolt housing portion 26, the worker can visually check, from the side of the jig 40, the tip portion of the shaft portion 14a protruding from the upper surface 12a.

[0074] The jig 40 is used when rotating and mounting the grinding wheel 10 to the mount 8. The mount 8 used in the second embodiment includes an arc-shaped long groove 8e having approximately the same width as the screw hole 8c, on the lower surface 8b side of the screw hole 8c (see FIGS. 10(A) to 10(C)).

[0075] FIG. 10(A) is a side view of the mount 8 according to the second embodiment, FIG. 10(B) is a partially cross-sectional side view of the mount 8 according to the second embodiment, and FIG. 10(C) is a bottom view of the mount 8 according to the second embodiment.

[0076] A mark 8f is provided on the outer peripheral side surface 8d at a predetermined position corresponding to one end of the long groove 8e. The mark 8f is engraved, for example, by laser processing. The above-mentioned screw hole 8c is provided in the upper part of the other end of the long groove 8e.

[0077] When mounting the grinding wheel 10 on this mount 8, the worker adjusts the orientation of the jig 40 housing the grinding wheel 10 so that the mark 8f corresponds to the tip of the shaft portion 14a of the bolt 14, and then raises the jig 40.

[0078] Fig. 11(A) is a diagram showing a state in which the grinding wheel 10 is raised relative to the mount 8 so that the upper surface 12a of the flange 12 contacts the lower surface 8b of the mount 8. At this time, a jig 40 is used, but for convenience, the jig 40 is omitted in Fig. 11(A).

[0079] When the grinding wheel 10 is raised, the upper part of the inner peripheral side surface 24d of the side portion 24b of the jig 40 comes into contact with the outer peripheral side surface 8d of the mount 8, so that the center of rotation of the grinding wheel 10 and the center of rotation of the mount 8 can be easily aligned.

[0080] When the upper surface 12a comes into contact with the lower surface 8b, the shaft portion 14a fits into the long groove 8e. Then, as shown in Fig. 11(B), the grinding wheel 10 is rotated together with the jig 40 in a predetermined direction to position the bolt 14 below the screw hole 8c.

[0081] Fig. 11(B) is a diagram showing a state in which the grinding wheel 10 is rotated relative to the mount 8 until the bolts 14 are positioned directly below the screw holes 8c. Note that, for convenience, the jig 40 is also omitted from Fig. 11(B). After rotating the grinding wheel 10, each bolt 14 is tightened into the screw holes 8c using the hexagonal wrench 30, as in Fig. 7.

[0082] In the second embodiment, too, with the grinding wheel 10 housed in the jig 40, the grinding wheel 10 can be attached to the mount 8 by fastening the bolt 14 into the screw hole 8c of the mount 8 from below the mount 8.

[0083] Furthermore, since multiple grinding wheels 18 are stored in the grinding wheel storage section 22, it is possible to prevent the worker from coming into contact with the grinding wheels 18, damage to the grinding wheels 18 by tools, and falling of grinding chips from the grinding wheels 18 and base 17 when attaching or removing the grinding wheel 10.

[0084] In addition, the structures, methods, etc. according to the above-described embodiments can be modified as appropriate without departing from the scope of the present invention. For example, the jig 40 of the second embodiment and the lid portion 32 can form a case for the grinding wheel 10. [Explanation of symbols]

[0085] 2: grinding unit, 4: spindle housing, 6: spindle, 6a: lower end 8: Mount, 8a: Top, 8b: Bottom, 8c: Screw holes, 8d: Outer periphery 8e: Long groove, 8f: Mark, 10: Grinding wheel 11: Workpiece, 11a: Front surface, 11b: Back surface, 11c: Concave part 12: flange, 12a: upper surface, 12b: lower surface, 12c: through hole, 12d: counterbore 13: Planned division line 14: bolt, 14a: shaft, 14b: head 15: device, 15a: device area, 15b: peripheral surplus area 16: Grinding wheel attachment part, 16a: Top surface, 16b: Bottom surface (one side) 17: base, 18: grinding wheel, 18a: outer peripheral side surface, 18b: bottom surface 20, 40: jig (jig for grinding wheel), 20a: height direction 22: grindstone housing portion, 22a: bottom portion, 22b: recessed portion, 22c: upper surface 24: base receiving portion, 24a: bottom portion, 24b: side portion, 24c: opening, 24d: inner peripheral side surface 24e:Notch 26: bolt receiving portion, 26a: bottom portion, 26b: opening, 30: hexagonal wrench (fastening tool) 32: lid portion, 32a: recessed portion, 32b: diameter, 32c: spacer 34: Case (for grinding wheels), 36: Depth

Claims

1. A grinding wheel jig used when mounting a grinding wheel having an annular grinding wheel portion disposed on one side of a circular base to a lower side of a disk-shaped mount attached to a lower end of a spindle, comprising: The grinding wheel jig comprises: a bottomed cylindrical grindstone housing portion that houses the annular grindstone portion; a ring-shaped base housing portion that is located on the opposite side of the bottom of the grindstone housing portion in the height direction of the grindstone housing portion, has an outer diameter larger than an outer diameter of the grindstone housing portion, and is capable of housing at least a part of the base; a plurality of cylindrical bolt accommodating sections each provided at a bottom of the base accommodating section and capable of accommodating a head of a bolt; Equipped with A jig for a grinding wheel, wherein each bolt receiving portion has an opening at its bottom through which a fastening tool can be inserted into the head of the bolt.

2. A jig for a grinding wheel as described in claim 1, characterized in that the inner peripheral surface of the side portion of the base accommodating portion comes into contact with the outer peripheral surface of the mount when the base accommodated in the base accommodating portion is brought into contact with the underside of the mount.

3. A grinding wheel case for accommodating a grinding wheel having an annular grinding wheel portion disposed on one side of a circular base, a grinding wheel jig comprising: a bottomed cylindrical grindstone accommodating section for accommodating the annular grindstone portion; an annular base accommodating section located on the opposite side of the bottom of the grindstone accommodating section in the height direction of the grindstone accommodating section, having an outer diameter larger than the outer diameter of the grindstone accommodating section, and capable of accommodating at least a part of the base; and a plurality of cylindrical bolt accommodating sections each provided at the bottom of the base accommodating section and capable of accommodating a bolt head, each bolt accommodating section having an opening at the bottom through which a fastening tool can be inserted into the bolt head; a cover portion that closes the opening of the base housing portion; A case for a grinding wheel comprising:

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