JP2000190217A - Rotary shaft with grinding wheel and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary shaft with grinding wheel which can install various inner diameters of grinding wheels to the main shaft of a machine tool, accurately. SOLUTION: This is a rotary shaft with grinding wheel which can install grinding wheels with various inner diameters made in a disk form, accurately to the main shaft of a machine tool, and a ring form bush 53 is placed between the main shaft and the grinding wheel, an oil pressure room is formed to either one side of the main shaft or the grinding wheel, near the inner part of the abutting surface to the bush 53, and at the position separated from the abutting surface, a feeding mechanism to feed the operation oil to the oil pressure room is provided, and the bush is made in a form allowable to expand and contract in the diameter direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating shaft with a grinding wheel, in which a disk-shaped grinding wheel is attached to a main shaft of a machine tool. The present invention also relates to a method for manufacturing such a rotary shaft with a grinding wheel.

[0002]

2. Description of the Related Art Conventionally, for example, a disk-shaped grinding wheel is used as a grinding wheel flange which is mounted on a main shaft of a machine tool such as a surface grinding machine by using hydraulic pressure.
There is one described in Japanese Patent No. 18050. This grinding wheel flange will be described with reference to FIG.

A fitting hole 1 for a spindle (not shown)
Is formed of a metal such as copper, and a flange portion 3 is formed at one end of an outer peripheral surface 2a thereof.
A ring-shaped grinding wheel 4 is attached to the outer peripheral surface 2a so as to generate a slight clearance between the ring-shaped grinding wheel 4 and the inner peripheral surface thereof. Has become.

[0004] A hydraulic chamber 6 is provided in the circumferential direction at a position near the inside of the outer peripheral surface 2a of the flange body 2 and separated from the outer peripheral surface 2a. A cylinder portion 8 communicating with the hydraulic chamber 6 via a flow path 7 is provided on the outer peripheral surface of the flange portion 3.
A piston 9 is screwed into the cylinder portion 8 so as to be able to advance and retreat, and is made liquid-tight. A balance weight 11 is attached to one end surface of the flange body 2.

When the piston 9 advances in the direction A, hydraulic oil is supplied from the cylinder portion 8 and the hydraulic chamber 6
The central portion of the wall portion 10 between the outer peripheral surface 2a of the flange body 2 and the outer peripheral surface protrudes toward the outer peripheral side, and presses the inner peripheral surface of the grinding wheel 4. As a result, the grinding wheel 4 is positioned, and at the same time, the wall 10 protrudes uniformly over the entire circumference, so that centering is performed.

When the piston 9 is moved in the direction B, the pressure in the hydraulic chamber 6 is reduced, and the grinding wheel 4 can be removed.

[0007]

However, when the grinding wheel 4 is mounted as described above, the inner diameter of the grinding wheel 4 that can be mounted is naturally limited, so that grinding wheels of various sizes cannot be easily used. There was a drawback.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotary shaft with a grinding wheel that can accurately attach grinding wheels having various inner diameters to a main shaft of a machine tool. It is another object of the present invention to provide a method for manufacturing a rotating shaft with a grinding wheel that can obtain high dimensional accuracy.

[0009]

According to a first aspect of the present invention, there is provided a rotary shaft with a grinding wheel, wherein a disk-shaped grinding wheel is attached to a main shaft of a machine tool. A ring-shaped bush is interposed between the spindle and the grinding wheel, and any one of the spindle and the grinding wheel is separated from the contact surface near the inside of the contact surface with the bush. A hydraulic chamber is formed at the position, a supply mechanism for supplying hydraulic oil to the hydraulic chamber is provided, and the bush is shaped to be expandable and contractible in the radial direction. The rotating shaft with a grinding wheel according to claim 2, wherein the disk-shaped grinding wheel is attached to a main shaft of a machine tool via a grinding wheel flange. A ring-shaped bush is interposed between the grinding wheel and the grinding wheel, and a hydraulic chamber is formed in the grinding wheel flange near the inside of the contact surface with respect to the bush and at a position separated from the contact surface. A supply mechanism for supplying hydraulic oil to the hydraulic chamber is provided, and the bush is shaped to be expandable and contractible in a radial direction. The rotary shaft with a grinding wheel according to claim 3, wherein the bush is evenly circumferentially opened at one end surface in the axial direction of the bush and has a diameter. A notch penetrating in the direction is formed. The rotary shaft with a grinding wheel according to claim 4, wherein the bush is formed such that the bush is uniformly opened in the circumferential direction on the radially circumferential surface of the bush and the shaft. A notch penetrating in the direction is formed, and the bush is further formed with a slit penetrating in the radial direction and the axial direction. In the rotary shaft with a grinding wheel according to claim 5, in the rotary shaft with a grinding wheel according to claim 1 or 2, the bush is equally divided in a circumferential direction into a plurality of divided bodies, and adjacent divided bodies are provided. It is characterized in that they are connected by connecting means. In the method for manufacturing a rotating shaft with a grinding wheel according to claim 6, a method for manufacturing the rotating shaft with a grinding wheel according to claim 1, wherein the bush is prepared.
The bush, of the spindle and the grinding wheel,
Hydraulic oil is supplied to the hydraulic chamber so as to be mounted or mounted on the side where the hydraulic chamber is formed, and to expand or reduce the diameter of the bush to an extent corresponding to the processing conditions. In the diametered state, the outer peripheral surface or the inner peripheral surface of the bush is dimensioned.
The method for manufacturing a rotary shaft with a grinding wheel according to claim 7 is a method for manufacturing the rotary shaft with a grinding wheel according to claim 2, wherein the bush is prepared, and the wheel flange is mounted on the main shaft. With the mounting, the bush is mounted on the grinding wheel flange, and hydraulic oil is supplied to the hydraulic chamber so as to expand the bush to an extent corresponding to the processing conditions. Wherein the dimensions of the outer peripheral surface of the bush are determined.

According to the first aspect of the present invention, the grinding wheel is attached to the main shaft of the machine tool via the radially expandable and contractible bush. When a hydraulic chamber is formed near the inside of the outer peripheral surface of the main shaft of the machine tool and at a position separated from the outer peripheral surface, when hydraulic oil is supplied to the hydraulic chamber by the supply mechanism, the hydraulic chamber expands due to the hydraulic pressure. As a result, the outer peripheral surface of the spindle increases in diameter. In response, the bush expands its diameter and presses the disc-shaped grinding wheel. Thereby, positioning between the main spindle and the disc-shaped grinding wheel is performed. Or, conversely, when the hydraulic chamber is formed near the inner peripheral surface of the grinding wheel and at a position separated from the inner peripheral surface, when hydraulic oil is supplied to the hydraulic chamber by the supply mechanism, the hydraulic pressure The chamber expands, and as a result, the inner peripheral surface of the grinding wheel is reduced in diameter.
In response, the bush is reduced in diameter and presses the main shaft. Thereby, positioning between the main spindle and the disc-shaped grinding wheel is performed. Since a ring-shaped bush that can be expanded and contracted is interposed between the grinding wheel and the spindle, if a plurality of bushes corresponding to various inner diameters of the grinding wheel are prepared, it is easy to use a single spindle. It is possible to use grinding wheels having various inner diameters. According to the second aspect of the present invention, the grinding wheel is attached to the main shaft of the machine tool via the bush and the wheel flange which can be radially expanded and contracted. Based on the fact that the hydraulic chamber is formed near the inside of the outer peripheral surface of the grinding wheel flange and at a position separated from the outer peripheral surface,
When hydraulic oil is supplied to the hydraulic chamber by the supply mechanism, the hydraulic chamber expands and expands in diameter due to the hydraulic pressure. In response, the bush expands its diameter and presses the disc-shaped grinding wheel. Thereby, positioning between the main spindle and the disc-shaped grinding wheel is performed. Since a ring-shaped bush that can be expanded and contracted is interposed between the grinding wheel and the wheel flange, if a plurality of bushes corresponding to various inner diameters of the grinding wheel are prepared,
The combination of a single spindle and a grinding wheel flange makes it possible to easily use grinding wheels of various inner diameters. According to the third aspect of the present invention, the bush is formed with a notch that is uniformly opened in the circumferential direction at one end face in the axial direction of the bush and penetrates in the radial direction. Since it can be easily expanded and contracted, a large expansion and contraction effect is provided, and such a large expansion and contraction effect is evenly provided, and the disc-shaped grinding wheel can be accurately attached to the main spindle of the machine tool. . As the expandable and contractible bush, for example, bushes 20 and 30 as shown in FIGS. 12 and 13 can be assumed. These bushes also belong to the category of the present invention in that they can be expanded and contracted in the radial direction. However, the bush 20 shown in FIG. 12 is divided into four in the circumferential direction. Thus, the bush 20
Is divided into four parts, the action of expanding the diameter by the bush is enhanced, but at the time of attaching and detaching the bush 20, it is necessary to individually handle the four divided bodies, and there is a disadvantage that the handling is inconvenient. The bush 30 shown in FIG.
One slit 31 penetrating in the axial direction is formed. By forming the slit 31 penetrating in the axial direction in this way, the handleability is improved, but at the time of expansion and contraction,
There is a large difference between the degree of diameter expansion at a position near the slit 31 and the degree of diameter expansion at a position distant from the slit 31, and there is a disadvantage that the diameter expansion tends to be unbalanced. On the other hand, in the bush according to the third aspect of the present invention, the notch formed in the bush is not open at the other end surface in the axial direction of the bush. The bush can be handled as an integral body without being performed, and the handling of the bush is easy. In addition, uniform expansion and contraction performance over the entire circumference can be obtained. According to the fourth aspect of the invention, similarly to the third aspect of the invention, the bush exhibits large and uniform expansion and contraction performance. Particularly in this case, the magnitude of the scaling performance is mainly provided by the slits, and the uniformity of the scaling performance is provided by the notches. According to the fifth aspect of the present invention, as in the above case, accurate positioning between the main shaft and the disk-shaped grinding wheel is provided by utilizing the uniform expansion and contraction of the bush. In this case, since the adjacent divided bodies are connected by the connection means, even if the bush is equally divided in the circumferential direction into a plurality of divided bodies to increase the radial expansion / contraction effect, Can be handled as one body, and the handling of the bush is easy. By the way, when the bush is formed with a slit penetrating in the radial direction and the axial direction as in the case of claim 4, when the bush is expanded or contracted, the amount of expansion and contraction in the vicinity of the bush is large, and There is a possibility that a slight imbalance occurs in the degree of expansion and contraction at each location such that the amount of expansion and contraction decreases as the distance increases, and the dimensional accuracy of the outer peripheral surface or the inner peripheral surface of the bush may deteriorate. According to the invention of claim 6 or 7, the outer peripheral surface or the inner peripheral surface of the bush (when the bush is mounted) in a state where the bush is actually mounted and the diameter is increased or reduced to the extent of the actual processing situation. Since the final dimensioning is performed by grinding the exposed peripheral surface of the bush that is not used, the dimensional error of the bush during actual machining is reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a rotary shaft with a grinding wheel and a method of manufacturing the same according to the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is a view schematically showing a first embodiment of a rotary shaft 40 with a grinding wheel of the present invention. In the drawing, reference numeral 41 denotes a main shaft, 42 denotes a flange portion, 43 is a bush, 44 is a wheel (disc-shaped grinding wheel), 46 is a holding plate, and 47 is a nut.

The main shaft 41 forms a spindle of a machine tool such as a surface grinder. A thread 41 a is formed at the tip of the main shaft 41. A hydraulic chamber 41c is formed near the inside of the outer peripheral surface 41b of the main shaft 41 (the contact surface with the bush 43) and at a position separated from the outer peripheral surface 41b. A supply mechanism (not shown) for supplying hydraulic oil is connected to the hydraulic chamber 41c via a flow path (not shown). The supply mechanism is, for example, as shown in FIG.
Can be the same as the cylinder portion 8 and the piston 9.

The flange portion 42 is formed so as to extend in a ring shape in the radial direction on the outer peripheral portion of the shaft portion 40a forming the tip of the spindle.

The bush 43 is arranged with a slight clearance with respect to the outer peripheral surface of the main shaft 41. As shown in FIG. 2, the bush 43 has a plurality of notches 43 a formed uniformly in the circumferential direction, that is, at symmetrical positions in the circumferential direction. In the illustrated example, three notches 43a are formed every 120 degrees. These notches 43a are open at one end surface 43b in the axial direction of the bush 43 and penetrate in the radial direction.

Returning to FIG. 1, the wheel 44 includes a ring-shaped base metal 44a and an abrasive layer 44b formed on the outer peripheral surface of the base metal 44a. It is attached to the main shaft 41.

The holding plate 46 is arranged around the main shaft 41 so as to sandwich the bush 43 and the wheel 44 in cooperation with the flange portion 42.

The nut 47 is screwed into the thread 41a of the main shaft 41. By tightening the nut 47, the holding plate 46 is connected to the bush 43 and the wheel 4
4, so that the bush 43 and the wheel 44 can be firmly clamped.

Next, a method of mounting the wheel 44 according to the present embodiment will be described.

At the time of mounting, first, a bush 43 is arranged around the main shaft 41, and a wheel 44 is arranged on the outer peripheral surface of the bush 43. And presser plate 4
6 is arranged around the main shaft 41, and a bush 43 and a wheel 44 are provided between the holding plate 46 and the flange 42.
After that, the nut 47 is tightened. This allows
The wheel 44 is temporarily held at a predetermined position.

Thereafter, the outer peripheral surface 41b of the main shaft 41 is enlarged by driving the hydraulic oil supply mechanism to supply the hydraulic oil to the hydraulic chamber 41c. As a result, the bush 43 receives a force in the diameter increasing direction. When a force is applied to the bush 43 in the radially increasing direction, the bush 43 expands in diameter so as to lift an area of the bush 43, particularly the area sandwiched by the notches 43 a, and presses the inner peripheral surface of the wheel 44. As a result, a strong connection is formed between the outer peripheral surface 43c of the bush 43 and the inner peripheral surface of the wheel 44. Thereby, the positioning of the wheel 44 with respect to the main shaft 41 is performed accurately.

In this case, since the bush 43 is formed with the notches 43a uniformly in the circumferential direction, a uniform diameter-increasing action is brought about, and the wheel 44 is accurately adjusted with respect to the main shaft 41 of the machine tool. It is attached.

Moreover, the notch 4 formed in the bush 43
3a has a large diameter-expanding effect because it penetrates the bush 43 in the radial direction. In addition, since the bush 43 is an integral body, the bush 43 can be easily handled.

Conversely, when the wheel 44 is removed from the main shaft 41, the pressure in the hydraulic chamber 41c is reduced by reducing the supply of hydraulic oil, and the outer peripheral surface of the main shaft 41 is returned to its original position (that is, expanded). Back to the previous position). Accordingly, the outer peripheral surface 43c of the bush 43 also returns to the original position. In this state, by removing the nut 47, the wheel 44 can be easily removed.

[Modification of First Embodiment] By providing a hydraulic chamber 41c on the main shaft 41 side as shown in FIG.
The diameter of the outer surface of the main shaft and the bush 43 is increased, and
By providing a hydraulic chamber 44c on the side of the wheel 44 as shown in FIG.
Can be reduced, so that the main shaft 41 and the wheel 44 can be accurately positioned.

More specifically, as shown in FIG.
The hydraulic chamber 4 is located near the inside of the inner peripheral surface 44d (the contact surface with the bush 43) and at a position separated from the outer peripheral surface 44d.
4c is formed. A supply mechanism (not shown) for supplying hydraulic oil to the hydraulic chamber 44c via a flow path (not shown) is connected, and the supply mechanism is connected to, for example, the cylinder 8 or the piston 9 in FIG. This is the same as the first embodiment described above.

In this modification, accurate positioning of the main shaft 41 and the wheel 44 is not performed by expanding the outer surface of the main shaft 41 and subsequently expanding the bush 43, but by reducing the diameter of the inner surface of the wheel 44. Except for the effect brought about by the subsequent diameter reduction of the bush 43, the same functions and effects as those of the above embodiment can be obtained.

[Second Embodiment] FIG. 4 is a view schematically showing a bush according to a second embodiment of the rotary shaft with a grinding wheel of the present invention. This embodiment is different from the first embodiment only in the shape of the bush.

As shown in FIG. 4, the bush 53 has a plurality of cutouts 54 and 55 formed uniformly in the circumferential direction, that is, at symmetrical positions in the circumferential direction. In the example shown,
On one end face 53a side of the bush 53, a series of four notches 54 opening at the end face 53a and penetrating in the radial direction at intervals of 90 °, and on the other end face 53b side of the bush 53, the end face 53b side And a series of four notches 55 at 90 ° intervals that are open and radially penetrate.

This embodiment can exhibit more uniform diameter-expanding performance than the first embodiment in that the symmetry of the notches 54 and 55 with respect to both end faces 53a and 53b is enhanced. That is, in the first embodiment, mainly, only the one end face 43b (shown in FIG. 2) in the axial direction is enlarged in diameter. On the other hand, in the second embodiment, both the axial one end face 53a (shown in FIG. 4) and the axial other end face 53b (shown in FIG. 4) have the same diameter. Is brought. Therefore, the second embodiment is more preferable from the viewpoint of uniformity of the diameter expansion in the axial direction.

Also in the second embodiment, the positioning of the reduced diameter type similar to the modification of the first embodiment can be performed instead of the positioning of the expanded diameter type.

[Third Embodiment] FIG. 5 is a view schematically showing a bush according to a third embodiment of the rotary shaft with a grinding wheel of the present invention. This embodiment is different from the first embodiment only in the shape of the bush.

As shown in FIG. 5, the bush 63 has a plurality of cutouts 64 formed uniformly in the circumferential direction, that is, at symmetrical positions in the circumferential direction. In the illustrated example, a series of four notches 64 are formed at intervals of 90 ° and open in the outer peripheral surface 63a of the bush 63 and penetrate in the axial direction.

As shown in the figure, the bush 63 further includes one slit 65 penetrating in the radial and axial directions.
Are formed.

In the third embodiment, similarly to the above-described embodiment, the bush 63 exhibits large and uniform expansion and contraction performance. Particularly in this case, the magnitude of the scaling performance is mainly provided by the slit 65, and the uniformity of the scaling performance is provided by the notch 64.

Also in the third embodiment, the positioning of the reduced diameter type, similar to the modification of the first embodiment, can be performed instead of the positioning of the enlarged diameter type.

[Preferred Embodiment of Third Embodiment] The third embodiment
In the embodiment, since the slit 65 is formed, there is a possibility that the outer diameter dimension when the diameter is increased becomes non-uniform between the vicinity of the slit 65 and a portion separated from the slit 65. In order to avoid such an adverse effect, in this embodiment, the dimensions of the outer peripheral surface of the bush 63 are measured in a state where the bush 63 is actually mounted and the diameter is increased to the extent of the actual processing situation.

The bush 6 thus dimensioned
By using No. 3, it is possible to minimize the dimensional error of the bush 63 at the time of actual machining, that is, at the time of actual diameter expansion, and even if the diameter expansion occurs unevenly, The bush 6 has no dimensional error.
3 can be used.

Fourth Embodiment FIG. 6 is a view schematically showing a bush according to a fourth embodiment of the rotary shaft with a grinding wheel of the present invention. This embodiment is different from the first embodiment only in the shape of the bush.

As shown in FIG. 6, a plurality of cutouts 74 are formed in the bush 73 evenly in the circumferential direction, that is, at symmetrical positions in the circumferential direction. In the illustrated example, a series of four notches 74 are formed at intervals of 90 ° and open in the inner peripheral surface 73a of the bush 73 and penetrate in the axial direction.

As shown in the figure, the bush 73 further includes one slit 75 penetrating in the radial and axial directions.
Are formed.

In the fourth embodiment, the same functions and effects as those of the third embodiment can be obtained. That is, the bush 73 can exhibit large and uniform expansion / contraction performance, in which case the magnitude of the expansion / contraction performance is mainly provided by the slit 75, and the uniformity of the expansion / contraction performance is provided by the notch 74. .

Also in the fourth embodiment, the positioning of the diameter reducing type similar to the modification of the first embodiment can be performed instead of the positioning of the diameter expanding type.

[Preferred Aspect of Fourth Embodiment]
In the embodiment, since the slit 75 is formed, the outer diameter dimension at the time of diameter expansion becomes non-uniform between the vicinity of the slit 75 and a portion separated from the slit 75 as in the third embodiment. There is a risk. In order to avoid such an adverse effect, in this embodiment, the inner peripheral surface of the bush 73 is dimensioned in a state where the bush 73 is actually mounted and the diameter is reduced to the extent of the actual processing situation.

The bush 7 thus dimensioned
By using No. 3, it is possible to minimize the dimensional error of the bush 73 during actual machining, that is, at the time of actual diameter reduction, and even if the diameter reduction occurs unevenly, The bush 7 has no dimensional error.
3 can be used.

[Fifth Embodiment] FIG. 7 is a view schematically showing a bush in a fifth embodiment of the rotary shaft with a grinding wheel according to the present invention. This embodiment is different from the first embodiment only in the shape of the bush.

The fifth embodiment is similar to the third and fourth embodiments.
It has features that combine the features of the embodiments. That is, as shown in FIG. 7, the plurality of cutouts 84, 8 are formed in the bush 83 evenly in the circumferential direction, that is, symmetrically in the circumferential direction.
5 are formed. In the illustrated example, the series of notches 84 are of a type that opens on the outer peripheral surface of the bush 83, and the series of notches 85 are of a type that opens on the inner peripheral surface of the bush 83. These notches 84, 85
They are offset from each other by 45 °.

As shown in the figure, the bush 83 further has one slit 86 penetrating in the radial and axial directions.
Are formed.

In the fifth embodiment, the bush 8
Since the notch is provided on both the inner peripheral surface and the outer peripheral surface of 3, the diameter expansion performance can be more evenly exhibited than in the third and fourth embodiments.

In the fifth embodiment, the positioning of the reduced diameter type similar to the modification of the first embodiment can be performed instead of the positioning of the enlarged diameter type.

Also in the fifth embodiment, similarly to the preferred embodiment of the third and fourth embodiments, the bush 83 is actually mounted and expanded and contracted to the extent of the actual machining condition. It is preferable to perform dimensioning of the outer peripheral surface or the inner peripheral surface of the above.

[Sixth Embodiment] FIG. 8 is a view schematically showing a sixth embodiment of a bush in a rotary shaft with a grinding wheel according to the present invention. This embodiment is different from the first embodiment only in the form of a bush.

As shown in FIG. 8, the bush 93 is formed as a plurality of divided bodies 94 equally divided in the circumferential direction, that is, divided symmetrically in the circumferential direction. In the illustrated example, it is configured as three divided bodies 94 divided every 120 degrees.

In the sixth embodiment, similarly to the above-described embodiment, when the hydraulic oil is supplied, the bush 9
The diameter of the outer peripheral surface of the wheel 3 can be increased, and accurate positioning of the wheel 44 can be performed.

In this embodiment, adjacent divided bodies 94 are connected by a spring (connection means) 95. By connecting the adjacent divided bodies 94 with a spring 95, the divided bodies 93 are separated.
The bush 93 can be handled as an integral body while allowing the separation between them.

In the sixth embodiment, the positioning of the diameter reducing type similar to the modification of the first embodiment can be performed instead of the positioning of the diameter expanding type. However,
When the bush 93 in this embodiment is used in a reduced diameter type, the bush 93 is formed such that at least a gap corresponding to the reduced diameter is formed between the divided bodies 94 in a state where the bush 93 is mounted on the main shaft. used.

Seventh Embodiment FIG. 9 is a view schematically showing a seventh embodiment of a bush in a rotary shaft with a grinding wheel according to the present invention. This embodiment is different from the first embodiment only in the form of a bush.

The bush 93 'is different from the sixth embodiment only in the method of connecting the plurality of divided bodies 94. That is, in this embodiment, all the divided bodies 94 are connected by one spring (connection means) 96.

In the seventh embodiment, the same functions and effects as those of the sixth embodiment can be obtained.

Eighth Embodiment FIG. 10 is a view schematically showing an eighth embodiment of a rotary shaft with a grinding wheel according to the present invention. This embodiment is different from the first embodiment in that
In this embodiment, only the whetstone flange 100 is interposed between the main shaft 41 and the bush 43 (in the present embodiment, not only the bush 43 but also another bush can be used).

A hydraulic chamber 101 is formed in the grinding wheel flange 100 near the inside of the outer peripheral surface (the contact surface with the bush 43) and at a position separated from the outer peripheral surface. A supply mechanism (not shown) for supplying hydraulic oil is connected to the hydraulic chamber 101 via a flow path (not shown).

In the present embodiment, similarly to the other embodiments, the bush can be expanded in diameter to perform highly accurate positioning.

The present invention is not limited to the above-described embodiment, but may be configured as follows. a) Instead of using the wheel 44 as a disk-shaped grinding wheel, an arbitrary disk-shaped grinding member such as a rotary knife or a cutter is used. b) Instead of targeting a surface grinding machine as a machine tool, any other machine tool having a rotating shaft or a spindle is targeted. c) Notches 43a, 54, 55, 64, 74, 85, 85
Arbitrarily set the number of. In this case, it is needless to say that the notches are arranged symmetrically in the circumferential direction. d) The number of divided bodies 94 is arbitrarily set. e) Instead of using springs 95, 96 as connecting means, use any other connecting means. Although not limited, it is preferable that the connecting means has an elastic restoring function such as a spring or rubber. f) The rotating shaft in the present invention includes not only the spindle exemplified above, but also other types of rotating shaft such as an arbor.

[0064]

According to the rotary shaft with a grinding wheel and the method of manufacturing the same according to the present invention, the following effects can be obtained. According to the rotary shaft with a grinding wheel according to claim 1 or 2, the grinding wheel is attached to the main shaft of the machine tool via the radially expandable and contractible bush. High-precision positioning between the plate-shaped grinding wheel can be performed. According to the rotary shaft with a grinding wheel according to the third aspect, by forming the notch evenly in the circumferential direction in the bush, it is possible to bring about a large and uniform radial expansion and contraction action. It can be attached to the main shaft of the machine tool with high accuracy. In addition, since the bush is not divided but integrated, the handling of the bush can be facilitated. According to the rotary shaft with a grinding wheel according to the fourth aspect, the bush can exhibit large and uniform expansion and contraction performance similarly to the above, and the disc-shaped grinding wheel can be adjusted with respect to the main shaft of the machine tool. Can be attached well. In addition, since the bush is not divided but integrated, the handling of the bush can be facilitated. According to the rotary shaft with a grinding wheel according to the fifth aspect, the bush is equally divided in the circumferential direction into a plurality of divided bodies, so that a uniform radial expansion and contraction action can be obtained, and The grinding wheel can be accurately mounted on the main shaft of the machine tool. In addition, since the adjacent divided bodies are connected by the connecting means, even if the bush is divided to enhance the radial expansion / contraction performance, the bush can be handled as an integral body,
The bush can be easily handled. Claim 6
According to the method of manufacturing a rotary shaft with a grinding wheel described in 7 or 7, the outer peripheral surface or the inner peripheral surface of the bush is dimensioned in a state where the diameter is enlarged or reduced to the degree of the actual processing condition. The dimensional error of the bush at the time of processing can be minimized.

[Brief description of the drawings]

FIG. 1 is a side view including a partial cross-sectional view schematically showing a first embodiment of a rotary shaft with a grinding wheel according to the present invention.

FIG. 2 is a perspective view showing a bush in the rotary shaft with a grinding wheel of FIG. 1;

FIG. 3 is a side view including a partial cross section showing a modification of the first embodiment of the rotary shaft with a grinding wheel according to the present invention.

FIG. 4 is a perspective view showing a bush in a second embodiment of the rotary shaft with a grinding wheel according to the present invention.

FIG. 5 is a perspective view showing a bush in a third embodiment of the rotary shaft with a grinding wheel according to the present invention.

FIG. 6 is a perspective view showing a bush in a fourth embodiment of the rotating shaft with a grinding wheel according to the present invention.

FIG. 7 is a perspective view showing a bush in a rotary shaft with a grinding wheel according to a fifth embodiment of the present invention.

FIG. 8 is a perspective view showing a bush in a sixth embodiment of the rotating shaft with a grinding wheel according to the present invention.

FIG. 9 is a perspective view showing a bush in a rotary shaft with a grinding wheel according to a seventh embodiment of the present invention.

FIG. 10 is a side view including a partial cross section schematically showing an eighth embodiment of a rotary shaft with a grinding wheel according to the present invention.

FIG. 11 is a side sectional view showing an example of a grindstone flange.

FIG. 12 is a perspective view showing an example of a bush that can be radially expanded and contracted.

FIG. 13 is a perspective view showing another example of a bush that can be radially expanded and contracted.

[Explanation of symbols]

 Reference Signs List 40 Rotary shaft with grinding wheel 41 Main shaft 41b Outer peripheral surface (contact surface) 41c Hydraulic chamber 43 Bush 43a Notch 43b Axial end surface 43c Outer peripheral surface 44 Wheel (disc-shaped grinding wheel) 44c Hydraulic chamber 44d Inner peripheral surface (contact surface) ) 53 Bush 53a Axial end face 53b Axial end face 54 Notch 55 Notch 63 Bush 63a Outer peripheral face 64 Notch 65 Slit 73 Bush 73a Inner peripheral face 74 Notch 75 Slit 83 Bush 84 Cutout 85 Slit 93 Bush 93 Bush 94 Split (Connecting means) 96 Spring (Connecting means) 100 Whetstone flange 101 Hydraulic chamber

Continued on the front page (72) Inventor Sumio Ito 246-1 Egoshi Kurosuno Izumicho, Iwaki-shi, Fukushima F-term in Mitsubishi Materials Corporation Iwaki Works (reference) 3C034 AA07 BB51 DD20

Claims (7)

[Claims] 1. A rotary shaft with a grinding wheel having a disk-shaped grinding wheel attached to a main shaft of a machine tool, wherein a ring-shaped bush is provided between the main shaft and the grinding wheel. A hydraulic chamber is formed in one of the main shaft and the grinding wheel, at a position near the inside of the contact surface with the bush and at a position away from the contact surface, and a hydraulic oil is provided for the hydraulic chamber. A rotary shaft with a grinding wheel, wherein the bush has a shape that can be radially expanded and contracted. 2. A rotary shaft with a grinding wheel, in which a disk-shaped grinding wheel is attached to a main shaft of a machine tool via a grinding wheel flange, wherein a rotating wheel with a grinding wheel is provided between the grinding wheel flange and the grinding wheel. A hydraulic chamber is formed in the whetstone flange near the inside of the contact surface with the bush and at a position separated from the contact surface, and a hydraulic oil is formed on the hydraulic chamber. A rotary shaft with a grinding wheel, wherein a supply mechanism for supplying is provided, and the bush is shaped to be expandable and contractible in a radial direction. 3. The rotary shaft with a grinding wheel according to claim 1, wherein the bush is formed with a notch that is uniformly open in the circumferential direction and that is open at one end in the axial direction of the bush and penetrates in the radial direction. A rotating shaft with a grinding wheel. 4. The rotary shaft with a grinding wheel according to claim 1, wherein the bush is formed with a notch that is uniformly opened in the circumferential direction and that is open in the radial circumferential surface of the bush and penetrates in the axial direction. The rotary shaft with a grinding wheel, wherein the bush is further formed with a slit penetrating in a radial direction and an axial direction. 5. The rotary shaft with a grinding wheel according to claim 1, wherein the bush is equally divided in a circumferential direction into a plurality of divided bodies, and adjacent divided bodies are connected by connecting means. A rotating shaft with a grinding wheel. 6. The method for manufacturing a rotary shaft with a grinding wheel according to claim 1, wherein the bush is provided, and the bush is formed of the main shaft and the grinding wheel.
Hydraulic oil is supplied to the hydraulic chamber so that the bush is expanded or reduced to an extent corresponding to the processing conditions, and is mounted on the side where the hydraulic chamber is formed. A method of manufacturing a rotary shaft with a grinding wheel, wherein dimensions of an outer peripheral surface or an inner peripheral surface of the bush are measured in a state where the bush is in a diameter. 7. A method for manufacturing a rotary shaft with a grinding wheel according to claim 2, wherein the bush is prepared, the wheel flange is mounted on the main shaft, and the wheel flange is mounted on the wheel flange. A bush is mounted, hydraulic fluid is supplied to the hydraulic chamber so as to expand the bush to an extent corresponding to the processing conditions, and in such a state where the diameter is expanded, the outer peripheral surface of the bush is dimensioned. A method for producing a rotating shaft with a grinding wheel.