JP2834016B2 - Whetstone with centering mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone provided with a centering mechanism.

[0002]

2. Description of the Related Art Generally, a disc-shaped or cup-shaped grindstone which is used by being fitted to a rotating shaft of a processing apparatus is provided on a cylindrical portion protruding from the center of one of the flange-shaped members. The grindstone is fixed to the rotary shaft by a grindstone fixing device that fits a through hole formed in the central part and presses the central part of the grindstone with the other flange-shaped member. When fitting the grindstone, in order to suppress the vibration and obtain high processing accuracy, it is desired that the axes of the two wheels coincide with each other, particularly when performing high-precision polishing or high-speed rotation drive. .

In general, the rotating shaft of the processing device has a tapered portion whose diameter decreases toward the tip, while one of a pair of members constituting the grinding wheel fixing device has one of the following members. Since a member having a tapered hole to be fitted to the tapered portion is used, this one member is merely fitted to the rotating shaft, and the axis of the member is made to coincide with the rotating shaft. I have. On the other hand, the whetstone is sandwiched between the other member in a state in which the whetstone is fitted in the through-hole by play fitting in a cylindrical portion formed at the center of the one member toward the tip end of the rotating shaft. It is attached by being pressed. However, between the through hole and the cylindrical portion, a gap based on the tolerance of the through hole is added to the clearance of the play fit, so that the axis of the grindstone does not always coincide with the rotation axis. For this reason, for example, in the case of a grinding wheel that performs processing on a disk-shaped outer peripheral surface, truing is performed after installation, and the center of the outer peripheral surface is aligned with the axis, or the grinding wheel is temporarily fixed to the rotating shaft and the hammer etc. Hitting was used to correct the mounting position. However,
In the former method, the grinding stone is wasted, and a large loss occurs particularly in a grinding stone using expensive abrasive grains such as diamond abrasive grains and CBN abrasive grains. In the latter method, since centering is performed depending on the intuition of the operator, it takes time and it is difficult to perform centering with high accuracy.

[0004]

Therefore, various proposals have been hitherto made to easily and surely perform the above-mentioned centering. For example, Japanese Utility Model Publication No. 56-98559, Tokuhei 2
-8867 (JP-A-61-68280), JP-A-1-216775, JP-A-5-21267
This is the one disclosed in Japanese Patent Publication No. 2 (1994). The above-mentioned technique, between the cylindrical portion of the one member and the grindstone, a centering member that projects radially by pressing a screw wedge and presses the inner peripheral surface of the grindstone, at a predetermined interval in the circumferential direction, for example, It is provided at three or more places. According to this technique, while rotating the grindstone around the rotation axis in a state where the grindstone is temporarily fastened to one of the members, a plurality of screwing-in operations are performed, for example, in accordance with the deflection of the outer peripheral surface detected by applying a dial gauge to the outer peripheral surface. Centering can be performed by screwing the wedges by a predetermined amount.

[0005] Further, the above-mentioned technique fixes a grindstone to a mold member having an outer peripheral surface similar to the cylindrical portion of the one member,
After rotating and centering while contacting the dial indicator on the outer peripheral surface of the grindstone, silicone rubber is poured between the outer peripheral surface of the mold member and the inner peripheral surface of the grindstone and hardened, so that the outer peripheral surface of the cylindrical portion is And a shim that fills a gap formed between the grinding wheel and the inner peripheral surface of the whetstone. According to this technique, a shim with high accuracy that fills the gap can be obtained. Therefore, prior to fixing the grindstone to one of the members, the shim is fitted into the cylindrical portion of the flange so that the core does not need to be particularly adjusted. Delivery will be performed.

Further, the above-mentioned technique is to form the outer peripheral surface of the cylindrical portion of the one member so as to have a regular polygonal cross section, and to radially extend between the outer peripheral surface and the inner peripheral surface of the grindstone. By providing a ring-shaped member having a plurality of movable alignment members at predetermined intervals, and by relatively rotating the cylindrical portion and the ring-shaped member, the grindstone through the alignment member according to the relative rotation angle. It presses the inner peripheral surface. According to this technique, all the alignment members are similarly moved to the outer peripheral side by the relative rotation, so that highly accurate centering can be performed by an extremely simple operation.

Further, the above-mentioned technique is used in a wheel grinding apparatus, in which a grinding wheel is attached to an outer peripheral surface of a base having a disk shape as a whole, wherein a grinding wheel is provided between the outer peripheral surface of the base and the grinding wheel. A ring-shaped member having an annular tapered surface formed on the outer peripheral surface and an annular groove formed on the inner peripheral side of the tapered surface, and pressing the inner peripheral surface of the grindstone by the elastic force of the tapered surface. It is. According to this technology,
After the grindstone is temporarily fixed, centering can be performed by a simple operation of pushing the ring-shaped member between the disc-shaped base and the grindstone and screwing it.

However, in the above-mentioned techniques,
In any case, there is a problem that processing of at least one member of the grindstone fixing device is required or a great deal of labor is required. That is, in the technique described above, it is necessary to form a screw hole for fixing the alignment member to one of the members. Further, since a plurality of screw wedges are sequentially adjusted while performing measurement with a dial gauge or the like, it takes time and requires skill to perform high-precision centering. In addition, in the technique, when fixing the grindstone to the one member, high-precision centering is performed by simply fitting the shim first, but it takes time and effort to produce the shim. In addition, it takes a long time to prepare the shim to wait for the silicone rubber to cure. In the technology,
The outer peripheral surface of the cylindrical portion needs to be processed, and in order to perform high-precision centering, it is necessary to form the cylindrical portion into a high-precision regular polygon. In addition, the technique is based on the premise that a special structure for attaching a grindstone to the outer peripheral surface of a grindstone fixing device is used. When a similar structure is applied to the fitting between the cylindrical portion and the grindstone, machining of the cylindrical portion is performed. Is required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a centering mechanism capable of performing high-precision centering using a conventionally used grindstone fixing device as it is. To provide a whetstone.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a through hole in the center portion penetrating in the axial direction, and the through hole is fitted to the rotating shaft. A grindstone used, (a) a female screw portion provided on the inner peripheral side of the through hole, and (b) a substantially annular shape provided with an external thread portion on an outer peripheral surface, and the female screw portion has a substantially annular shape. A fastening member screwed from one end, and (c) provided in the through-hole with an inner peripheral surface facing the outer peripheral surface of the rotating shaft, with the relative rotation of the fastening member and the through-hole. And a centering member that is elastically deformed in a direction in which the inner diameter of the inner peripheral surface is reduced in accordance with the axial displacement generated.

[0011]

In this manner, the grindstone has a female screw portion formed in the through hole, an annular fastening member screwed from one end of the through hole, and an outer peripheral surface of the rotating shaft. Provided in the through hole with an inner peripheral surface facing the
A centering member is provided which is elastically deformed in a direction in which an inner diameter of an inner peripheral surface thereof is reduced in accordance with an axial displacement generated due to a relative rotation between the fastening member and the through hole. for that reason,
The centering of the whetstone with the centering mechanism is performed in a state where the whetstone is fitted to the cylindrical portion of one of the members of the whetstone fixing device, and the tightening member and the through hole are used until the cylindrical portion is tightened by the centering member. Is performed by a simple operation of only relative rotation, and the inner diameter of the centering member is uniformly deformed in the reducing direction, so that the centering is performed with high accuracy. In addition, since the tightening member and the centering member are provided in the through holes of the grindstone, the central part of the grindstone is completely fixed by being clamped without changing the conventional grindstone fixing device as it is or with little change. . Therefore, a grindstone provided with a centering mechanism capable of high-precision centering using a conventional grindstone fixing device having a relatively simple structure can be obtained.

[0012] Preferably, in the grinding wheel with a centering mechanism, (d) the tightening member has a tapered inner periphery whose diameter decreases from the screwing direction side to the opposite direction of the screwing direction. (E) the centering member is formed at a plurality of elastically deformable claws that are divided in a circumferential direction and protrude in a direction opposite to the screwing direction, and formed at the distal ends of the plurality of claw portions. And a sliding contact surface that is in sliding contact with the tapered inner peripheral surface of the tightening member, and is fixed so as not to move in the axial direction in the through hole.

According to this structure, since the centering member is provided so as not to move in the axial direction, the fastening member screwed into the through hole and the axial direction generated by relative rotation with the through hole. , The axial relative position between the fastening member and the centering member is changed. At this time, the fastening member
The centering member has a tapered inner peripheral surface having a smaller diameter in a direction opposite to the screwing direction, and the centering member is divided in a circumferential direction, and a sliding contact surface that comes into sliding contact with the tapered inner peripheral surface of the tightening member has a distal end portion. The inner peripheral surface of the tightening member moves the outer peripheral surface of the centering member toward the inner peripheral side in accordance with a change in the relative position of the two members in the axial direction. As a result, the inner diameter of the centering member is reduced in accordance with the axial displacement of the fastening member.

[0014] Preferably, in the grinding wheel with a centering mechanism, (f) the other end of the through hole has an annular face opposed to an end face of a fastening member screwed from one end of the through hole. A clamping member having an end surface is fixed, and (g) the centering member bulges inward by being clamped between the end surface of the tightening member and the end surface of the clamping member to reduce the inner diameter. It is a thick cylindrical elastic member that shrinks. With this configuration, the clamping member facing the end surface of the fastening member is fixed to the other end side of the through hole, while the centering member is formed of the thick cylindrical elastic member. When the member is displaced in the axial direction according to the relative rotation with the through hole, the centering member provided between the tightening member and the pressing member is elastically compressed by being pressed between the two members. It is deformed and swells inward to reduce the inner diameter.

[0015] Preferably, in the grinding wheel with a centering mechanism, (h) the other end of the through hole has an annular shape opposed to an end surface of a fastening member screwed from one end of the through hole. A clamping member having an end surface is fixed, and (i) the centering member is a disc-shaped spring whose inner diameter is reduced by being clamped between an end surface of the tightening member and an end surface of the clamping member. is there. According to this configuration, since the centering member is formed of the disc-shaped spring, the fastening member is provided with the through hole as in the case where the centering member is formed of the thick cylindrical elastic member. When displaced in the axial direction according to the relative rotation, the centering member provided between the tightening member and the pressing member is elastically deformed by being pressed between the two members, and the inner diameter is reduced. Will be reduced.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a view showing a state in which a grindstone with a centering mechanism (hereinafter referred to as a grindstone) 10 of the present invention is mounted on a rotating shaft 12 such as a grinder (not shown). , The lower half shows a cross section passing through the axis of the rotating shaft 12. The whole grindstone 10 has a disk shape, and is attached to the rotating shaft 12 while being held between a pair of fixed flanges 14 and a movable flange 16. In the present embodiment, the fixing flange 14 and the moving flange 16 constitute a grindstone fixing device.

The rotary shaft 12 is provided with a tapered portion 18 whose diameter is reduced toward the distal end. The tapered portion 18 has a female screw hole 20 from its distal end.
Is provided. In addition, the fixed flange 14 has a diameter smaller than that of the grindstone 10 and a large-diameter portion 22 having a disc shape.
And an axial length smaller than the grindstone 10 and its large diameter portion 22
A first cylindrical portion 23 having a diameter sufficiently smaller than the large diameter portion 22 and having a diameter sufficiently smaller than the first cylindrical portion 23 and having a female screw portion 24 on the inner diameter side;
And a second cylindrical portion 25 formed following the first cylindrical portion 23 and a tapered through hole 26 fitted into the tapered portion 18 of the rotary shaft 12. The moving flange 16 has a diameter similar to that of the large-diameter portion 22, has a disk shape, and has a through hole 28 at the center thereof to be fitted with the second cylindrical portion 25.

On the other hand, the grinding wheel 10 has the first
It has a through-hole 30 having an inner diameter larger than the outer diameter of the cylindrical portion 23, and a base body 32 made of, for example, S45C tempered steel, and, for example, diamond or CBN (cubic boron nitride).
Is a so-called superabrasive grindstone provided with an abrasive grain layer 33 fixed to the outer peripheral surface thereof by bonding abrasive grains such as resin, inorganic material, metal, and plating. On the inner peripheral side of the through hole 30 of the base metal body 32, the large-diameter portion 22
A female screw portion 34 of a left-hand thread is formed in a range from the end on the side to the substantially middle portion in the axial direction of the through hole 30. The female screw portion 34 is similarly made of S45C tempered steel, and has an outer peripheral surface. A substantially annular fastening member 38 provided with the external thread portion 36 is
The through hole 30 is screwed from one end, that is, from the moving flange 16 side.

The male screw portion 36 of the tightening member 38 is formed in a range from the end of the tightening member 38 located on the large-diameter portion 22 side to a substantially middle portion in the axial direction. The inner peripheral surface of the fastening member 38 is formed in a range from the end on the moving flange 16 side to a substantially middle portion in the axial direction, that is, a range in which the male screw portion 36 is not formed. The tapered surface 40 whose inner diameter increases as the distance from the inner surface increases (that is, a tapered inner peripheral surface whose diameter decreases from the screwing direction side toward the opposite direction) is formed. The taper surface 40 has an inclination angle θ with respect to the axial direction of, for example, about 10 °. In addition, the moving flange 16 of the fastening member 38
On the side end surface, engagement holes 42 having a depth substantially the same as the axial length of the tapered surface 40 are provided at eight locations, for example, at equal intervals in the circumferential direction as shown in FIG. The engagement hole 42 is used to catch a claw 58 of the tool 56 when rotating the fastening member 38 as described later. FIG. 2 is a view showing the left half of a state in which only the grindstone 10 is viewed from the moving flange 16 side in FIG.

On the other hand, a relatively shallow stepped portion 44 is provided on the inner peripheral portion of one surface located on the large diameter portion 22 side of the base metal main body 32.
Is provided. For example, S45
A flange 4 is formed at the end located on the large-diameter portion 22 side, which is made of C-tempered steel.
The centering member 48 having an outer peripheral portion 6 is provided with a screw 49 at an outer peripheral portion of the flange portion 46 at regular intervals in the circumferential direction, for example.
It is fixed to the base metal body 32 by being screwed at two places. The centering member 48 has a large number of elastically deformable pieces (in the present embodiment) directed from the inner peripheral end of the flange 46 to the moving flange 16 side (that is, the direction opposite to the screwing direction of the tightening member 38). In FIG. 2, 24) claw portions 50 are erected at equal intervals in the circumferential direction, for example, as shown in FIG.

The plurality of claws 50 are formed at their tip portions at the same inclination angle (about 10 °) in the direction opposite to the tapered surface 40 of the tightening member 38, and the tapered surface 40 is formed.
The outer peripheral surface is provided with a tapered surface 52 which is slidably contacted with the inner peripheral surface 54. The inner peripheral surface 54 is provided in parallel with the axial direction. In addition, the tapered surface 52 is provided with the centering member 48 from the end on the moving flange 16 side.
Is formed in a range up to a substantially intermediate portion in the axial direction. In this embodiment, the tightening member 38 and the centering member 48 are used.
A centering mechanism is constituted by the tapered surface 5.
2 corresponds to the sliding surface, and the inner peripheral surface of the centering member 48 facing the outer peripheral surface of the rotating shaft 12 is formed by the inner peripheral surface 54 of the large number of claws 50. The centering member 48
Although the flange 46 is attached to the end face of the base metal body 32, the claw 50 is located on the inner peripheral side of the through hole 30, and is substantially provided in the through hole 30. Also,
In the present embodiment, the height of the claw portion 50 of the centering member 48 is made substantially the same as the thickness dimension of the base metal body 32, and as shown in FIG. The end face on the side of the moving flange 14 is configured not to protrude from the end face of the base metal body 32, and a centering mechanism is provided within the thickness dimension of the grindstone 10.

A method of attaching the grindstone 10 configured as described above to the rotating shaft 12 of the grinding machine will be described below. First, the fixing flange 14 is fixed to the rotating shaft 12 by fitting the through hole 26 of the fixing flange 14 to the rotating shaft 12 and tightening the bolt 60 into the female screw portion 24.
The outer diameter of the head of the bolt 60 is smaller than the outer diameter of the second cylindrical portion 25, and the moving flange 16
There is no hindrance at the time of fitting. Next, the through hole 30 of the grindstone 10 (more precisely, the inner peripheral surface 54 of the centering member 48) is fitted into the first cylindrical portion 23 of the fixed flange 14. At this time, a gap is formed between the first cylindrical portion 23 and the inner peripheral surface 54, the size of which is determined by their processing accuracy and the degree of wear.

After that, using the tool 56 shown in FIG.
Of the base metal body 3 by rotating the fastening member 38 in the counterclockwise direction.
2 into the through hole 30. At this time, the tapered surface 40 of the fastening member 38 inclined in different directions from each other.
And the tapered surface 52 of the centering member 48 are in sliding contact with each other, so that as the tightening member 38 is screwed in, the tapered surface 52 of the centering member 48 is pressed by the tapered surface 40 and the claw portion 50 is With the vicinity of the boundary between the flange portion 46 and the claw portion 50 as a fulcrum, it is tilted in the direction of arrow A in FIG. 1, and the inner diameter of the centering member 48 is reduced while maintaining the axial position.

That is, the centering member 48, or more precisely, the claw portion 50, of the centering member 48, according to the axial displacement generated by the relative rotation between the fastening member 38 and the through hole 30 of the base metal body 32, includes This is elastically deformed in the direction in which the inner diameter of the peripheral surface 54 decreases. Thereby, the first cylindrical portion 23
The gap between the grinding wheel 10 and the inner peripheral surface 54 of the grinding wheel 10 disappears, and the centering of the grinding wheel 10 is completed. Then, the moving flange 16 is fitted to the second cylindrical portion 25 of the fixed flange 14 and is fixed at a plurality of positions in the circumferential direction by the fixing screws 62. The large-diameter portion 22 of the fixed flange 14 and the moving flange 16 By sandwiching the base metal body 32, the whetstone 10
Is attached to a rotating shaft 12 such as a grinding machine. In addition, the fixed flange 14 is attached to the rotating shaft 12
It may be performed in a state where it is not fitted to, for example,
As described above, the fixed flange 14 and the movable flange 16
May be fitted to the rotating shaft 12 while holding the grindstone 10. Further, the female screw portion 24 is provided with the fixing flange 1.
This is for screwing a bolt (not shown) when removing the 4 from the rotating shaft 12.

Table 1 below shows the whetstone 10 of this embodiment mounted as described above and the centering mechanism (ie, the centering mechanism)
This figure shows the result of a measurement in which a conventional grindstone without the fastening member 38 and the centering member 48) is attached to the same rotating shaft 12 (having a horizontal axis).
The whetstone 10 was attached while the fixed flange 14 was fitted to the rotating shaft 12. In such a mounting method, the conventional grindstone is eccentric by the size of the gap between the inner peripheral surface 54 (the through hole of the grindstone) and the cylindrical portion 24 by the weight of the grindstone 10. Therefore, Table 1
As shown in FIG. 1, in the conventional grindstone, the outer peripheral runout and the amount of unbalance were large.
In the case of 0, a small peripheral runout and an unbalance amount were obtained in each case. In FIG. 1, the gap is omitted.

[0027]

[Table 1]

In Table 1 above, the grinding machine A has a large gap and the grinding machine B has a small gap. As is clear from Table 1, any one of the grinding wheels 10 in the present embodiment is used. Good results have also been obtained in these cases. On the other hand, in the case of a conventional grindstone, the grinding machine B having a large gap has a particularly large peripheral runout and an unbalance amount. The “outer circumference runout” is the difference between the maximum value and the minimum value of the distance from the rotation center to the outer peripheral surface (the ground surface of the grindstone 10).
Generally, it is desired that the thickness is 10 μm or less,
The "unbalance amount" is a displacement amount of the rotation center in the rotation of the grindstone 10, and is generally desired to be 0.1 μm or less. This unbalance amount is measured under the condition that the peripheral speed of the grindstone 10 is 30 m / s.

According to the present embodiment, the grindstone 10 has a female screw portion 34 formed in the through hole 30 and an annular tightening screw threaded from one end of the through hole 30 on the moving flange 16 side. An attachment member 38 and an inner peripheral surface 54 facing the outer peripheral surface of the rotating shaft 12 are provided in the through hole 30, and are provided in the axial direction generated by the relative rotation of the fastening member 38 and the through hole 30. A centering member 48 that is elastically deformed in a direction in which the inner diameter of the inner peripheral surface 54 is reduced according to the displacement. Therefore, the centering of the grinding stone 10 is
In a state where the first cylindrical portion 23 of the fixing flange 14 is fitted to the first cylindrical portion 23, the tightening member 38 and the through hole 30 are simply rotated relative to each other until the first cylindrical portion 23 is tightened by the centering member 48. Since the inner diameter of the centering member 48 is uniformly deformed in the reducing direction,
Alignment is performed with high precision. Moreover, since the tightening member 38 and the centering member 48 are provided within the through hole 30 of the grindstone 10 within the thickness dimension thereof, the conventional flanges 14 and 16 can be used as they are or with little change. The central part is pinched and completely fixed. Therefore, it is possible to obtain the grindstone 10 having a centering mechanism capable of performing high-precision centering using the conventional flanges 14 and 16 having a relatively simple structure.

In this embodiment, the centering member 4
The fastening member 3 is screwed into the through hole 30 because it is fixed in the through hole 30 so as not to move in the axial direction.
The axial relative position of the tightening member 38 and the centering member 48 is changed according to the axial displacement generated due to the relative rotation between the tightening member 38 and the through hole 30. At this time, the fastening member 38 includes a tapered surface 40 having a smaller diameter from the screwing direction side to the opposite direction to the screwing direction, and the centering member 48 is divided in the circumferential direction and tightened. Member 3
8, a plurality of elastically deformable claws 50 protruding in the direction opposite to the screwing direction, and a tapered surface 52 formed at the tip of the plurality of claws 50 and slidingly contacting the tapered surface 40 of the tightening member 38. Therefore, the tapered surface 40 of the fastening member 38 moves the tapered surface 52 of the centering member 48 toward the inner circumferential side, that is, toward the outer circumferential surface of the rotary shaft 12 in accordance with the change in the relative position in the axial direction. As a result, the inner diameter of the centering member 48 is reduced in a direction in which the inner diameter of the centering member 48 is reduced in accordance with the axial displacement of the fastening member 38, and the centering is performed.

According to the present embodiment, the centering of the grindstone 10, that is, the screwing of the fastening member 38 is performed by the claw 5 of the tool 56.
The alignment can be performed by rotating the engagement holes 58 and 58 in the engagement holes 42, so that the centering operation is relatively easy.

Next, another embodiment of the present invention will be described. In the following embodiments, portions common to the above-described embodiments will be denoted by the same reference numerals and description thereof will be omitted.

(Second Embodiment) FIG. 4 is a sectional view of a main part showing the structure of another centering mechanism that can be used for the grindstone 10. As shown in FIG.
In the present embodiment, the centering mechanism includes a tightening member 64 and a centering member 66. The tightening member 64 has substantially the same shape as the tightening member 38 of the above embodiment,
On the other hand, the centering member 66 is formed such that the outer peripheral surface 68 of the claw portion 50 is not a tapered surface, but is a cylindrical surface whose axis coincides with the through hole 30. Even with such a configuration, the tightening member 64 and the through hole 30 are rotated relative to each other as in the above-described embodiment, and the tightening member 64 is screwed in the direction of arrow B in FIG. As a result, the claw portion 50 is pressed and is tilted in the direction of arrow A in the drawing with the vicinity of the boundary with the flange portion 46 as a fulcrum, thereby performing centering.

That is, in the centering mechanism composed of the tightening member 64 and the centering member 66, both of the surfaces 40 and 68 that come into contact with each other need not be tapered, and only the tightening member 64 is provided. The tapered surface 40 may be provided. In addition, in the case of such a configuration, the axial length of the claw portion 50 is
It is necessary to form the base metal body 32 shorter than the axial length.

(Third Embodiment) FIG. 5 is a view showing still another configuration of a centering mechanism that can be used for the grindstone 10. In this embodiment, the cylindrical fastening member 70 and the elastic member 7
A centering mechanism is constituted by the second and ring-shaped pressing members 74. The fastening member 70 and the clamping member 74
Are made of, for example, S45C tempered steel.
The fastening member 70 has a male screw portion 76 screwed to the female screw portion 34 of the base metal body 32 on the outer peripheral surface, and can be relatively rotated with the through hole 30 similarly to the fastening member 64 and the like. Is moved in the axial direction. Further, the clamping member 74 is provided with the flange 46 such as the centering member 66 of the above-described embodiment.
The outer peripheral portion is fixed to a stepped portion 78 provided on the inner peripheral portion of the base metal body 32 by a plurality of screws 49.

On the other hand, the elastic member 72 is made of, for example, a natural rubber or a synthetic rubber having a thick and short cylindrical shape, and is provided between the tightening member 70 and the pressing member 74 on the inner peripheral side of the through hole 30. It is provided in the position of. The fastening member 70, the elastic member 72, and the clamping member 74 have their inner peripheral surfaces 80, 82, and 84 all located on a single cylindrical surface having a common axis with the through hole 30. The entirety, that is, the entire centering mechanism is provided within the thickness of the base metal 32 (the grindstone 10).

In the centering mechanism having the above-described structure, the fastening member 70 and the through hole 30 are relatively rotated and the fastening member 7 is rotated.
0 is moved in the direction of arrow B in the figure, the pressing member 74 is fixed to the stepped portion 78 and cannot move in the axial direction. It is clamped between the member 74. For this reason, the elastic member 72
Is reduced in thickness in the axial direction according to the pinching force, and is swelled in the inner circumferential direction, that is, in the direction of arrow C in the figure, and is elastically deformed substantially uniformly in the circumferential direction as shown by the dashed line in the figure. Let me do. As a result, the inner diameter of the grindstone 10 is reduced, but the elastic member 72 transmits the pressure as if it were a fluid, and the centering is performed with high accuracy regardless of the weight of the grindstone 10. As is clear from the above description, in the present embodiment, the elastic member 72 corresponds to the centering member.

(Fourth Embodiment) FIG. 6 is a view showing still another configuration of a centering mechanism that can be used for the grindstone 10. As shown in FIG. In this embodiment, in the embodiment shown in FIG.
Instead of the elastic member 72, a plurality of sheets (4 in this embodiment)
5), but the other parts are the same as in the embodiment of FIG. That is, the disc spring 86 corresponds to the centering member, and the tightening member 70, the pressing member 74, and the disc spring 86 constitute a centering mechanism. When the tightening member 70 is screwed forward, the disc spring 86 is pinched between the tightening member 70 and the pinching member 74.
It is elastically deformed so that the whole becomes flat, and at the same time, it is elastically deformed substantially uniformly in the circumferential direction in the direction in which the inner diameter decreases. Thus, centering is performed in the same manner as in the case where the elastic member 72 is used.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in still another embodiment.

For example, in the above-described embodiment, the case where the present invention is applied to the disc-shaped grindstone 10 has been described. However, the present invention has a through hole and is used by being attached to a rotating shaft. If it is available, it can be applied to grindstones of various shapes, for example, it may be applied to a cylindrical or cup-shaped grindstone.

In the first and second embodiments, the inner peripheral surfaces of the tightening members 38 and 64 and the outer peripheral surface of the centering member 48 are tapered, so that the tightening members 38 and 64 are fixed to the fixing flange 14. Of the centering member 66 is screwed into the large-diameter portion 22 side. However, contrary to the second embodiment, the outer circumferential surface 6 of the centering member 66 is opposite to the second embodiment.
Even if 8 is a tapered surface and the inner peripheral surface of the tightening member 64 is a cylindrical surface, centering can be similarly performed. Further, for example, in the first embodiment, the tapered surface 40 of the fastening member 38 is used.
And the inclination of the tapered surface 52 of the centering member 48 are reversed, so that the tightening member 38
It is also possible to configure so that the claw portion 50 is tilted down to perform centering by relatively rotating in a direction away from the center portion 2.

In the third embodiment, the elastic member 7
2, the inner peripheral surface 82 is located on the same cylindrical surface as the inner peripheral surfaces 80 and 84 of the tightening member 70 and the pressing member 74. However, the inner peripheral surface 82 is higher than the inner peripheral surfaces 80 and 84. May be located on the inner peripheral side or the outer peripheral side. Also, the inner peripheral surfaces 80 and 84 of the fastening member 70 and the clamping member 74 need not be located on the same cylindrical surface.

Further, in the fourth embodiment, the centering member is constituted by four disc springs 86, but the number thereof can be changed as appropriate. For example, the centering member may be constituted by one disc spring 86, and conversely, the centering member may be constituted by five or more disc springs 86.

Although not specifically exemplified, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view showing a state in which a grindstone with a centering mechanism of the present invention is attached to a rotating shaft.

FIG. 2 is a view showing a half of a state in which the grindstone of FIG. 1 is viewed from one surface on a moving flange side.

FIG. 3 is a view showing a tool used for rotating a tightening member when performing the centering shown in FIG. 1;

FIG. 4 is a view showing a cross section of a main part of another embodiment of the present invention, and is an enlarged view showing a vicinity of a through hole of a base metal body in FIG. 1;

FIG. 5 is a diagram showing a cross section of a main part of still another embodiment of the present invention, and is a diagram corresponding to FIG. 4;

FIG. 6 is a diagram showing a cross section of a main part of still another embodiment of the present invention, and is a diagram corresponding to FIG. 4;

[Explanation of symbols]

 10: Grinding stone with centering mechanism 12: Rotating shaft 30: Through hole 34: Female thread 36: Male thread 38: Tightening member 48: Centering member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B24D 5/16 B24B 45/00

Claims (4)

(57) [Claims] 1. A grindstone provided with a through hole at a central portion penetrating in an axial direction, wherein the through hole is used by being fitted to a rotating shaft, and a female screw portion provided on an inner peripheral side of the through hole. An outer peripheral surface having a male thread portion, forming a substantially annular shape, a tightening member screwed into the female thread portion from one end of the through hole, and an inner peripheral surface facing the outer peripheral surface of the rotary shaft. A centering member that is provided in the through hole and that is elastically deformed in a direction in which the inner diameter of the inner peripheral surface is reduced according to an axial displacement generated due to the relative rotation of the fastening member and the through hole, A grindstone with a centering mechanism characterized by including: 2. The tightening member has a tapered inner peripheral surface having a smaller diameter from a screwing direction side toward a direction opposite to the screwing direction, the centering member is divided in a circumferential direction, and A plurality of elastically deformable claws protruding in a direction opposite to the screwing direction; and a sliding contact surface formed at the tip of the plurality of claws and slidingly contacting the tapered inner peripheral surface of the tightening member. 2. The grinding wheel with a centering mechanism according to claim 1, further comprising: 3. A clamping member having an annular end surface facing an end surface of a fastening member screwed from one end of the through hole is fixed to the other end side of the through hole. 2. A centering elastic member according to claim 1, wherein said elastic member is a thick-walled cylindrical elastic member which swells inward by being pressed between an end surface of said fastening member and an end surface of said pressing member to reduce its inner diameter. Whetstone with mechanism. 4. A clamping member having an annular end surface facing an end surface of a fastening member screwed from one end of the through hole is fixed to the other end of the through hole. 2. The grinding wheel with a centering mechanism according to claim 1, wherein the grinding wheel is a disc-shaped spring whose inner diameter is reduced by being squeezed between an end surface of the fastening member and an end surface of the squeezing member.