JP2003340705A - Grinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinder capable of stably grinding even a groove of narrow width with high accuracy. <P>SOLUTION: This grinder 1 comprises a rotating shaft 13 comprising a pulley part 14; a grind wheel 11 fixed to the rotating shaft 13; an arm 10 holding the rotating shaft 13 and the grind wheel 11 in a state of externally projecting a part of the grind wheel, rotatably holding both ends of the rotating shaft 13 through a bearing 12, and having recessed parts 16a, 16b on its faces respectively opposite to both side faces of grind wheel 11; fluid supply means 17a, 17b, 18a, 18b for supplying the pressurized fluid to the recessed parts 16a, 16b; a transmission belt 33 wound on a pulley part 14; a pulley on which the transmission belt 33 is wound; a driving motor for applying the rotating power to the rotating shaft 13; a work holding means for holding the work on the grinding position; and a transferring means for relatively moving the arm 10 and the work in the directions to be close to and separated from each other. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention grinds a grind portion by moving a work piece and a grinding wheel relative to each other to bring the grind wheel into contact with a grind portion of the work piece. It relates to a grinding device.

[0002]

2. Description of the Related Art Conventionally, a groove W formed along the center axis of an inner peripheral surface of a ring-shaped work W as shown in FIG.
As a grinding device for grinding b, for example, the grinding device disclosed in Japanese Patent Laid-Open No. 10-109260 is known. This grinding device is shown in FIGS. 8 and 9. still,
FIG. 8 is a side view showing a schematic configuration of the grinding device,
FIG. 9 is a cross-sectional view taken along the arrow GG.

As shown in FIGS. 8 and 9, the grinding device 1
00 is a grinding head main body 10 provided so as to be movable in the vertical direction (arrow direction) and the front-back direction (direction orthogonal to the paper surface).
1, a grinding wheel body 104 integrally formed with two bearings 102 arranged at a predetermined interval in the grinding head body 101, and a rotation shaft 103 rotatably supported by each bearing 102, A non-driving motor, a pulley 105 provided on the output shaft of the driving motor, an outer peripheral surface of the grinding wheel 104, a transmission belt 106 wound around the pulley 105, and the like.

The grinding head body 101 comprises a first grinding head 101a and a second grinding head 101b. The first grinding head 101a and the second grinding head 101b.
Of the grinding wheel 104, static pressure pockets 107a and 107b are formed on the respective surfaces facing the both side surfaces of the grinding wheel 104. A pressurized fluid is appropriately supplied to the static pressure pockets 107a and 107b from a fluid supply means (not shown).

The rotary shaft 103 has a hollow portion 103a, and a collar 108 is fitted between the inner ring 102a of each bearing 102 and the grinding wheel 104. Then, the bolt 109 is inserted into the hollow portion 103a,
The inner ring 102a, the collar 108, and the grinding wheel 10 are cooperated with the nut 110 screwed to the tip portion thereof.
The four parts are clamped in close contact with each other.

On the other hand, the outer ring 102b of each bearing 102
Is the first grinding head 101a and the second grinding head 1
Bearing stoppers 11 provided at 01b respectively
1, 111 and grinding head caps 112a, 112b
It is clamped and fixed by.

Thus, the bolt 109 and the nut 11
0, collar 108, grinding wheel 104, bearing stoppers 111, 111 and grinding head cap 11
A preload is applied to each bearing 102, 102 by 2a, 112b.

According to the grinding apparatus 100 configured as described above, first, the work W and the grinding head body 1 are
01 is appropriately positioned, and then the rotational power of a drive motor (not shown) is transmitted to the grinding wheel 104 via the pulley 105 and the transmission belt 106 to rotate the grinding wheel 104, and the grinding head body 101 is moved downward. The grinding wheel 104 is moved into the groove Wb formed in the work W, and the inner surface of the groove Wb is ground by the grinding wheel 104.

At this time, the pressurized fluid is supplied from the fluid supply means (not shown) to the static pressure pockets 107a, 107.
The grinding wheel 104 supplied to each of b is supported by the supplied pressurized fluid from both sides thereof with a uniform force.
This suppresses the wobbling of the grinding wheel 104 in the axial direction. Further, as described above, the preload is applied to each bearing 102, and the applied pressure prevents rattling of the bearing 102, and this also suppresses the wobbling of the grinding wheel 104 in the axial direction.

As described above, in the conventional grinding apparatus 100,
Grinding is performed in a state where the transmission belt 106 is wound around the outer periphery of the grinding wheel 104 to rotate the transmission belt 106, and fluid pressure is applied to both side surfaces of the grinding wheel 104 and a pressure is applied to the bearing 102. It

[0011]

By the way, the width of the groove Wb to be machined is not always uniform, and there are some of which the width is extremely narrow. In this case, the grinding wheel is adjusted according to the groove width. It is necessary to reduce the width of 104.

However, in the conventional grinding apparatus 100, since the transmission belt 106 is wound around the outer circumference of the grinding wheel 104 to rotate the grinding wheel 104, the width of the grinding wheel 104 is narrowed. However, the width of the transmission belt 106 needs to be narrowed accordingly, which causes a problem that the strength of the transmission belt 106 is reduced and the life thereof is also shortened.

Further, since a pressure is applied to the bearing 102, the position of the grinding wheel 104 in the axial direction is such that the bolt 109, the nut 110, the collar 108 and the bearing 10 are positioned.
2 and the bearing stoppers 111 and 111 and the grinding head caps 112a and 112b. Therefore, the static pressure pocket 107
If the balance of the forces acting on both side surfaces of the grinding wheel 104 in parts a and 107b is not uniform, the grinding wheel 104 cannot move in its axial direction, and is deformed in either axial direction, The groove Wb cannot be processed with high precision. In addition, in this case, an extra load acts on the bearing 102 due to the non-uniform acting force, and there is also a problem that the life of the bearing 102 is shortened.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a grinding apparatus capable of stably and highly accurately grinding a groove having a narrow width. .

[0015]

According to a first aspect of the present invention for achieving the above object, there is provided a rotating shaft having a pulley portion, and the rotating shaft rotates together with the rotating shaft. And a disk-shaped grinding wheel attached so that
An arm that rotatably holds both ends of the rotary shaft via bearings and holds a grinding wheel attached to the rotary shaft so as to sandwich it from both side surfaces thereof in a state where a part thereof protrudes to the outside. There, an arm having a recess formed on each of the surfaces facing the both sides of the grinding wheel, a fluid supply means for supplying a pressurized fluid to the recess, and a pulley part of the rotary shaft. A transmission belt, a pulley around which the transmission belt is wound, a drive motor that applies rotational power to the rotary shaft via the transmission belt, and a workpiece holding unit that holds the workpiece at a grinding position. And a feed means for relatively moving the arm and the workpiece in a direction of approaching and separating from each other.

According to this grinding apparatus, first, the rotational power is transmitted from the drive motor to the rotary shaft via the transmission belt,
The rotary shaft and the grinding wheel are rotated about the axis thereof, and a pressurized fluid is supplied from the fluid supply means to the concave portion, a fluid pressure acts on both side surfaces of the grinding wheel, and the fluid pressure causes the grinding wheel to rotate. Are supported in the axial direction.

Next, the arm and the work piece are relatively moved by the feeding means in a direction in which they approach each other, and the work piece is provided with a groove along the axial direction on the inner peripheral surface of the hole and is ground. When the part is the groove, the grinding wheel enters into the groove and the inner surface of the groove is ground by the grinding wheel.

Thus, according to the grinding apparatus having the above structure,
Since the rotational power is transmitted to the rotary shaft via the transmission belt that is wound around the pulley portion of the rotary shaft, the transmission with a certain strength is achieved regardless of the width of the grinding wheel. A belt can be used, and rotational power can be stably transmitted to the rotary shaft.

Therefore, when machining a groove having a narrow width, a stable grinding process can be performed as compared with a conventional grinding device configured to wind a transmission belt around the outer periphery of the grinding wheel to rotate the grinding wheel. It can be carried out.

The rotary shaft may be structured so as to be supported by the bearing so as to be movable in the axial direction, as in the invention described in claim 2.

If the position of the grinding wheel in the axial direction is fixed, and if the forces acting on both sides of the grinding wheel in the recess are not uniform, the grinding wheel cannot move in the axial direction, The groove is deformed in one of the axial directions, and the groove cannot be processed with high precision. Further, in this case, there is also a problem that the life of the bearing is shortened because an extra load acts on the bearing due to the non-uniform acting force.

As described above, if the rotary shaft is constructed so as to be movable in its axial direction, the rotary shaft to which the grinding wheel is attached moves in the axial direction as appropriate in accordance with the acting force acting on the grinding wheel, Due to this movement, the forces acting on both side surfaces of the grinding wheel become equal, so that the grinding wheel does not deform. Therefore, the groove to be processed can be ground with high accuracy. It is also possible to prevent an excessive load from acting on the bearing.

Further, as described in claim 3, the grinding wheel may be attached to the rotary shaft so as to be movable in the axial direction of the rotary shaft. In this way, according to the acting force acting on the grinding wheel, the grinding wheel is appropriately moved in the axial direction, and the force acting on both side surfaces of the grinding wheel is equalized by the movement, so that the rotation shaft is As in the case of being configured to be movable in the axial direction, the grinding wheel is not deformed, and the groove to be processed can be ground with high accuracy.

The fluid is preferably a grinding fluid as in the invention described in claim 4. With this configuration, the grinding liquid supplied to the recesses leaks from the recesses, and the leaking grinding liquid is guided to the grinding portion along both side surfaces of the grinding wheel and contributes to the grinding processing. Further, since the grinding fluid supplied to the concave portion can be collected together with the grinding fluid supplied from another grinding fluid supply unit,
The handling becomes easy.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a perspective view showing a grinding device according to the present embodiment, and FIG.
FIG. 9 is a partial cross-sectional view taken along line A-A in FIG. 3 is a sectional view taken along the line BB in FIG. 2, and FIG. 4 is a sectional view taken along the line C-C in FIG.

As shown in FIGS. 1 to 4, the grinding apparatus 1 of this embodiment is arranged on a bed (not shown) and on the bed (not shown), and is in the D direction (up and down direction) shown by the arrow. And arrow E
Direction 2 (movable in the front-back direction), a movable table 2, an arm 10 fixed to the movable table 2, and an arm 10 rotatably supported by the arm 10.
A disk-shaped grinding wheel 11 to which is fixed, a rotary driving means 30 for rotating the grinding wheel 11 by transmitting rotational power to the grinding wheel 11, and a work W provided on the bed (not shown). And a feed means (not shown) for moving the moving table 2 in the arrow D and E directions.

In the present example, the work W is formed in a ring shape, and a through hole Wa vertically penetrating the center of the work W,
A groove Wb formed along the central axis of the through hole Wa is provided on the inner peripheral surface of the through hole Wa, and the groove Wb is a grinding target. In addition, through holes Wd and We which are also vertically penetrated are formed around the through hole Wa, and the groove W
An escape hole Wc is formed in the b portion.

The arm 10 is composed of a first arm 10a and a second arm 10b for holding the grinding wheel 11 so as to sandwich it from both side surfaces thereof, and is provided with an appropriate holding space 10c for holding the grinding wheel 11. There is. The grinding wheel 11 is
The pulley portion 14 of the rotating shaft 13 having the pulley portion 14
Is fixed to the end surface of the rotary shaft by bolts 19,
Both ends of 3 are rotatably supported by bearings 12, 12 which are arranged at a predetermined interval on the first arm 10a and the second arm 10b. Thus, the grinding wheel 1
1 is the first arm 1 with a part thereof protruding to the outside.
0a and the second arm 10b. The bearing 12 is covered with covers 15a and 15b.

Incidentally, between the bearing 12 and each end face of the rotary shaft 13, between the bearing 12 and the covers 15a and 15b, and between both ends of the rotary shaft 13 and the covers 15a and 15b, respectively. Appropriate gaps S1, S2, S3, S4, S5
S6 is formed, and the gaps S1, S2, S3 are formed.
The clearance allowed for S4, S5, S6 and the bearing 12 allows the rotary shaft 13 to move in the axial direction.

The first arm 10a and the second arm 10b are the inner surfaces forming the holding space 10c, and the static pressure of an appropriate depth is applied to each surface facing both side surfaces of the grinding wheel 11. A plurality of pockets 16a, 16b are formed, and supply holes 18a, 18b communicating with the static pressure pockets 16a, 16b, and the supply holes 18a, 18b.
Supply holes 17a and 17b communicating with the respective holes are bored. Then, the grinding fluid, which is appropriately pressurized from a fluid supply means (not shown), is supplied to the supply holes 17a and 17b,
The supplied grinding fluid is supplied to the static pressure pockets 16a and 16b through the supply holes 18a and 18b, respectively.

The rotation driving means 30 has a drive motor 31 fixed to the movable table 2, a pulley 32 provided on an output shaft 31a of the drive motor 31, and a pulley 32.
And the transmission belt 33 wound around the pulley portion 14
Etc. Thus, the rotational power of the drive motor 31 is transmitted to the rotary shaft 13 via the output shaft 31a, the pulley 32, the transmission belt 33, and the pulley portion 14, whereby the grinding wheel 11 is rotated. .

The holding means 40 comprises a gate-shaped frame 41.
A reference plate 42 fixed to the upper side of the frame 41, and arranged below the reference plate 42,
A temporary placement plate 44 fixedly mounted on the frame 41 via the bracket 43, and a work W placed below the temporary placement plate 44 and placed on the temporary placement plate 44.
Is composed of a clamp mechanism 45, etc., which moves upward and presses and fixes it on the lower surface of the reference plate 42.

The lower surface of the reference plate 42 serves as a reference surface for the grinding wheel 11, and a through hole 42a through which the arm 10 can pass is formed at the center thereof. Further, a slot-shaped escape hole 42b through which the grinding wheel 11 can pass is formed in a portion corresponding to the grinding wheel 11. Further, when the work W comes into contact with the lower surface, the positioning pins 42c, which are respectively fitted into the through holes Wd, We,
42d is fixed so as to project downward from the lower surface.

The clamp mechanism 45 includes the lifting cylinder 4
6 and a clamp member 47 fixed to the tip of the piston rod of the elevating cylinder 46. The clamp member 47 moves up and down in the arrow F direction (vertical direction) by the operation of the elevating cylinder 46. The clamp member 47 is
It is composed of a cylindrical member having a hole 47a into which the arm 10 can be inserted in the central portion thereof, and in a portion corresponding to the grinding wheel 11, a split groove 47b penetrating from the inner peripheral surface to the outer peripheral surface is formed. The grinding wheel 11 can be inserted into the split groove 47b.

The temporary placement plate 44 has an upper surface serving as a placement surface on which the work W is placed. When the work W is placed, the positioning pins are fitted into the through holes Wd and We, respectively. 44b and 44c are fixed so as to project upward from the upper surface. Further, a through hole 44a into which the clamp member 47 can be inserted is formed in the central portion.

The grinding apparatus 1 of the present example configured as described above
According to the method, as described below, the groove W of the work W is
b is ground. The movable table 2 is at the upper limit position,
The clamp member 47 is assumed to be in the lower limit position.

First, as shown in FIG. 2, the work W is positioned with respect to the through holes Wd and We by positioning pins 44b and 44.
It is placed on the temporary placement plate 44 so that c are respectively inserted. Thereby, the through hole Wd and the positioning pin 42
c, the through hole We and the positioning pin 42d,
Each of them is in a vertically overlapping state.

Next, the lifting cylinder 4 of the clamp mechanism 45.
6 is driven to move the clamp member 47 upward. As a result, the clamp member 47 is inserted into the through hole 44 a of the temporary placement plate 44, the upper surface of the clamp member 47 contacts the work W placed on the temporary placement plate 44, and pushes it upward. Then, first, the positioning pins 42c and 42d are fitted into the through holes Wd and We, respectively, and the groove W of the workpiece W is inserted.
b is positioned with respect to the grinding wheel 11. This state is shown in FIG.

After that, as the work W is further moved upward, the upper surface of the work W contacts the lower surface of the reference plate 42, and the work W is clamped and fixed between the reference plate 42 and the clamp member 47. The state in which the work W is fixed in this way is shown in FIG.

Then, when the drive motor 31 is driven, the rotational power thereof is output shaft 31a, pulley 32, transmission belt 3
It is transmitted to the rotary shaft 13 via the pulley 3 and the pulley portion 14, whereby the grinding wheel 11 is rotated. At this time, the pressurized grinding fluid is supplied from the fluid supply means (not shown) to the supply holes 17a and 17b and the supply holes 18a and 18a.
is supplied to each static pressure pocket 16a, 16b via b,
The grinding wheel 11 is supported from both sides by the acting force of the supplied grinding fluid. As a result, the grinding wheel 11 is prevented from swinging in its axial direction.

By the way, each static pressure pocket 16a, 16b
The action force acting on both side surfaces of the grinding wheel 11 by the pressurized grinding fluid supplied to the wheel is difficult to make uniform on both side surfaces, and is usually non-uniform. .

In this example, as described above, since the rotary shaft 13 is constructed so as to be movable in the axial direction thereof, the grinding wheel 1
Even if the forces acting on both side surfaces of No. 1 are uneven, the rotary shaft 13 and the grinding wheel 11 move in the axial direction so that the acting forces become uniform. That is, the closer the grinding wheel 11 is to the static pressure pockets 16a and 16b, the more the static pressure pockets 16 are concerned.
While the grinding fluid pressure in a and 16b increases, the static pressure pocket 16 becomes more distant from the static pressure pockets 16a and 16b.
Since the grinding fluid pressure in a and 16b becomes low, the grinding wheel 11 moves in the axial direction so that the forces acting on both side surfaces thereof become uniform.

Then, as shown in FIG. 7, the moving table 2 is moved in the direction of arrow D (up and down direction) by appropriate feeding means (not shown) to bring the grinding wheel 11 into contact with the groove Wb of the work W. As a result, the same portion is ground. And
When the grinding process is completed, the moving table 2 and the clamp member 47
To the original position.

Thus, according to the grinding apparatus 1, the rotational power is transmitted to the rotary shaft 13 via the transmission belt 33 wound around the pulley portion 14 of the rotary shaft 13. Therefore, regardless of the width of the grinding wheel 11, the transmission belt 33 having a certain strength can be used, and the rotational power can be stably transmitted to the rotary shaft 13. Therefore, even when the groove Wb having a narrow width is processed, it is possible to perform stable grinding as compared with the conventional grinding device.

Further, as described above, when the forces acting on both side surfaces of the grinding wheel 11 by the grinding liquid are non-uniform, if the position of the grinding wheel 11 in the axial direction is fixed, the grinding wheel 11 is fixed. 11 cannot move in the axial direction,
The groove Wb cannot be machined with high accuracy due to deformation in either of the axial directions, but in the present example,
Since the rotary shaft 13 and the grinding wheel 11 are configured to be movable in the axial direction thereof, the groove Wb to be processed can be ground with high accuracy without causing the above deformation. It is also possible to prevent an excessive load from acting on the bearing 12.

Although one embodiment of the present invention has been described above, the specific mode of the present invention is not limited to this. For example, the shape of the work W that is the workpiece and the shape of the groove Wb that is the portion to be ground are not limited to the above-described examples.

In the above example, the rotational power of the drive motor 31 is transmitted to the rotary shaft 13 via the pulley portions 14 and 32 and the transmission belt 33, but the present invention is not limited to this. The rotational power of the drive motor 31 may be transmitted to the rotary shaft 13 by a gear or a friction wheel provided as appropriate.

Further, although the grinding wheel 11 was fixed to the rotary shaft 13 by the bolts 19, it was not fixed in this way, and the grinding wheel 1
1 is engaged with the rotary shaft 13 by a key or a pin,
The grinding wheel 11 and the rotating shaft 13 may be connected in the rotating direction, while the grinding wheel 11 may be movable with respect to the rotating shaft 13 in the axial direction.

In this way, when the acting force acting on both side surfaces of the grinding wheel 11 is non-uniform, the grinding wheel 11 is appropriately moved in the axial direction according to the acting force, and the movement is performed. Since the forces acting on both side surfaces of the grinding wheel 11 are equalized, the grinding wheel 11 is not deformed and the groove Wb to be machined can be ground with high accuracy as in the above example.

The bearing 12 is not limited to the rolling bearing in the above example, but may be a sliding bearing.

[Brief description of drawings]

FIG. 1 is a perspective view showing a grinding device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional view taken along line BB in FIG.

FIG. 4 is a cross-sectional view taken along line CC in FIG.

FIG. 5 is an explanatory diagram for explaining the operation of the grinding device according to the present embodiment.

FIG. 6 is an explanatory diagram for explaining the operation of the grinding device according to the present embodiment.

FIG. 7 is an explanatory diagram for explaining the operation of the grinding device according to the present embodiment.

FIG. 8 is a front view showing a part of a grinding device according to a conventional example.

9 is a sectional view taken along the line GG in FIG.

[Explanation of symbols]

1 grinding machine 2 mobile 10 arms 11 grinding wheel 12 bearings 13 rotation axis 14 Pulley section 16a, 16b Static pressure pocket 17a, 17b Supply hole 18a, 18b Supply hole 30 rotation drive means 31 Drive motor 32 pulley 33 transmission belt 40 holding means 41 frames 42 Reference plate 44 Temporary plate 45 Clamp mechanism

Claims (4)

[Claims] 1. A rotary shaft having a pulley portion, a disk-shaped grinding wheel attached to the rotary shaft so as to rotate together with the rotary shaft, and both ends of the rotary shaft are rotatable through bearings. An arm for holding the grinding wheel attached to the rotary shaft so as to be sandwiched from both side surfaces of the grinding wheel attached to the rotary shaft in a state where a part of the grinding wheel is projected to the outside. Arms each having a concave portion formed on its surface, fluid supply means for supplying a pressurized fluid to the concave portion, a transmission belt wound around the pulley portion of the rotating shaft, and a pulley around which the transmission belt is wound. A drive motor for applying rotational power to the rotary shaft via the transmission belt, a workpiece holding means for holding the workpiece at a grinding position, and the arm and the workpiece approaching each other. Separate Grinding apparatus being characterized in that configured by providing a feeding means for relatively moving countercurrent. 2. The grinding apparatus according to claim 1, wherein the rotary shaft is supported by the bearing so as to be movable in the axial direction thereof. 3. The grinding apparatus according to claim 1, wherein the grinding wheel is attached to the rotary shaft so as to be movable in the axial direction of the rotary shaft. 4. The method according to claim 1, wherein the fluid is a grinding fluid.
Any of the grinding devices described.