JP2019025612A - Internal grinding device - Google Patents

Abstract

To provide an internal grinding device that is capable of grinding holes at both ends of a workpiece simultaneously and easily secures dimensional tolerance and geometric tolerance with high precision.SOLUTION: An internal grinding device 1 for grinding the inner periphery of a hole of a cylindrical workpiece W comprises: a workpiece support device 20 for rotatably supporting the workpiece W; a first grinding unit 30 arranged at one end side of the workpiece W in order to rotatably support a first grinding wheel 31 to be inserted into the hole of the workpiece W from one end; and a second grinding unit 40 arranged at the other end side of the workpiece W in order to rotatably support a second grinding wheel 41 to be inserted into a hole of the workpiece W from the other end. The first grinding unit 30 and the second grinding unit 40 are respectively movable in a rotation axis direction of the workpiece W and in a direction perpendicular to the rotation axis direction. Accordingly, the holes at both ends of the workpiece W can be ground simultaneously, and dimensional tolerance and geometrical tolerance are secured with high precision.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an internal grinding device for grinding an inner periphery of a cylindrical workpiece from both ends of the workpiece.

  2. Description of the Related Art Conventionally, an internal grinding device is known in which a grinding wheel is inserted into a hole of a cylindrical workpiece and the inner periphery of the hole of the workpiece is ground by the grinding wheel.

  For example, in Patent Document 1, a single grindstone spindle head mounted on a grindstone table movable in the left-right direction and the front-rear direction, and a swivel capable of rotating a work holder on which a work is rotatably mounted by 0 to 180 degrees. An internal grinding device having a work stage mounted on a mechanism is disclosed. According to the internal grinding device of this document, by rotating the work holder by 180 degrees, it is possible to perform internal grinding from both ends of the work with one grindstone spindle head.

Further, for example, Patent Document 2 includes a first grindstone and a second grindstone, and inserts a first grindstone from one end of a cylindrical body that is a workpiece, and inserts a second grindstone from the other end, An internal grinding device that grinds circular inner surfaces at both ends of a cylindrical body is disclosed. The internal grinding device of the document has a first drive unit that supports and rotates the first grindstone, and a second drive unit that supports and rotates the second grindstone. The drive unit and the second drive unit are provided so as to be independently movable in the direction of the rotation axis of the grindstone.
The work holding unit that holds and rotates the cylindrical body is movable in a horizontal direction perpendicular to the rotation axis of the cylindrical body.

  Further, in the configuration in which the workpiece holding unit is moved in the horizontal direction perpendicular to the rotation axis of the workpiece as in the internal grinding device disclosed in Patent Document 2, the first driving unit and the second driving unit are arranged. A rail for movably supporting the work holding unit is arranged. Therefore, in this type of inner surface grinding apparatus, the rail that movably supports the first drive unit and the second drive unit is divided at the central portion of the inner surface grinding apparatus in which the work holding unit is provided. That is, the first drive unit and the second drive unit are each supported by separate rails.

  In addition, as can be seen in FIG. 4 of Patent Document 2, in the conventional internal grinding apparatus, a cylindrical body as a workpiece is generally supported rotatably via a rolling bearing.

JP 2014-79832 A JP 2002-361543 A

  However, as in the prior art disclosed in Patent Document 1, in an internal grinding apparatus of a system that grinds the inner periphery of the hole on one end side after grinding the inner periphery of the hole on one end side of the workpiece, It was difficult to ensure high-accuracy geometrical tolerances for the two holes. Specifically, there is a possibility that a slight shift may occur in the rotation axis of the workpiece before and after the workpiece reversal. If a shift occurs in the rotation axis of the workpiece, the axis of the holes at both ends of the workpiece is shifted, and the holes at both ends are It cannot be finished within the range of concentricity and coaxiality.

  In the prior art disclosed in Patent Document 1, both ends of the workpiece cannot be processed at the same time, and after grinding one end of the workpiece, the other end is ground. There is also the problem that time is long. In addition, a process of reversing the work is required, and positioning of the reversed work is complicated and takes time.

  On the other hand, in the internal grinding device of the prior art disclosed in Patent Document 2, the inner periphery of both ends of the workpiece can be ground simultaneously by two grindstones. However, in the internal grinding device of the same document, since the first drive unit and the second drive unit do not move in the cutting direction perpendicular to the rotation axis of the workpiece, the holes on both ends of the workpiece can be finished to a predetermined dimensional accuracy. difficult.

  Specifically, in the internal grinding device of the same document, the first drive unit and the second drive unit do not move in the cutting direction perpendicular to the rotation axis of the workpiece, and the workpiece holding unit moves, so that both ends of the workpiece are moved. The holes are simultaneously ground in the radial direction. Therefore, the positions of the first grindstone and the second grindstone with respect to the workpiece rotation axis must be adjusted with high accuracy in advance in a direction perpendicular to the workpiece rotation axis.

  That is, for the first grindstone and the second grindstone, if the eccentric position in the radial direction with respect to the rotation axis of the workpiece is not set with high accuracy in advance, the diameters of the holes at both ends of the workpiece are each set to a predetermined dimensional tolerance. The grinding process cannot be performed with high accuracy so as to be within the range of. Specifically, in the case of grinding holes of the same diameter at both ends of the workpiece, the amount of eccentricity in the radial direction with respect to the rotation axis of the workpiece is highly accurate for the first grindstone and the second grindstone. Must match. If the eccentric amounts of the first grindstone and the second grindstone with respect to the rotation axis of the workpiece do not coincide with each other with high accuracy, the holes at both ends of the workpiece cannot be finished with the same dimensions with high accuracy.

  Similarly, when grinding holes of different diameters at both ends of the workpiece, the eccentric amounts of the rotation axes of the first grindstone and the second grindstone with respect to the rotation axis of the workpiece are respectively increased in advance for each grinding process. Must be set to precision.

  Further, in the configuration in which two drive units provided on both ends of the workpiece are supported by separate rails as in the conventional internal grinding device, the rotation axes of the two grindstones are made to coincide with each other with high accuracy. It is difficult to finish the holes at both ends of the workpiece with high precision so that the holes are within a predetermined geometric tolerance.

  Moreover, in the structure which supports a workpiece | work rotatably via a rolling bearing, a workpiece | work will shift | deviate to radial direction although it is very slight, when the rolling element of a bearing moves during grinding. Therefore, there has been a problem that it is difficult to ensure high-precision roundness and cylindricity for the hole in the workpiece.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to be able to grind holes at both ends of a workpiece at the same time, and to easily ensure highly accurate dimensional tolerances and geometric tolerances. It is an object of the present invention to provide an internal grinding apparatus that can perform the above-described process.

  An internal grinding device of the present invention is an internal grinding device that grinds the inner periphery of a hole in a cylindrical workpiece, and is provided on a workpiece support device that rotatably supports the workpiece, and on one end side of the workpiece. A first grinding unit provided; a second grinding unit disposed on the other end side of the workpiece; and a first grinding unit rotatably supported by the first grinding unit from the one end side. A first grinding wheel inserted into the hole of the workpiece, and a second grinding wheel rotatably supported by the second grinding unit and inserted into the hole of the workpiece from the other end side. And the first grinding unit and the second grinding unit are movable in a direction perpendicular to the rotation axis direction and the rotation axis direction of the workpiece, respectively. To do.

  According to the internal grinding device of the present invention, a workpiece support device that rotatably supports a cylindrical workpiece, and the workpiece is disposed on one end side of the workpiece and inserted into the hole of the workpiece from the one end side. A first grinding unit that rotatably supports the first grinding wheel, and a second grinding wheel that is disposed on the other end side of the workpiece and is inserted into the hole of the workpiece from the other end side. A second grinding unit that rotatably supports the first grinding unit, and the second grinding unit is movable in a direction perpendicular to the rotation axis direction and the rotation axis direction of the workpiece, respectively. is there. Thereby, the inner periphery of the hole of both ends of a workpiece | work can be ground simultaneously and with high precision by the 1st grinding wheel and the 2nd grinding wheel. Specifically, by simultaneous machining from both ends of the workpiece, the concentricity and coaxiality of the holes at both ends of the workpiece are ensured with high accuracy, and the first grinding wheel and the second are independently moved in the radial direction of the workpiece. Each grinding wheel is ground within a desired dimensional tolerance range. Therefore, the grinding time is shortened to increase the productivity of the grinding process, and a high-accuracy geometric tolerance is secured for the holes at both ends of the workpiece, thereby improving the quality of the grinding process.

  Further, according to the internal grinding apparatus of the present invention, the first grinding unit and the second grinding unit have a pair of rails extending in the rotation axis direction of the workpiece, and the first grinding unit and the second grinding unit are slidable along the rails. It may be supported on a rail. Thereby, since the 1st grinding unit and the 2nd grinding unit are supported on the common rail with which straightness was ensured with high precision, it is mutually in the direction perpendicular to the axis of rotation of a work. Are aligned with high accuracy. Therefore, the holes at both ends of the workpiece can be ground with high accuracy within a desired geometric tolerance.

  Further, according to the internal grinding device of the present invention, the workpiece support device includes a rotating body that supports and rotates the workpiece, and a base body that rotatably supports the rotating body. You may be supported by the base | substrate part by the pressure bearing. Thereby, the shift | offset | difference to the radial direction at the time of rotation of a workpiece | work is suppressed, and a highly accurate roundness hole processing is implement | achieved.

It is a perspective view showing the outline of the internal grinding device concerning the embodiment of the present invention. 1 is a front view of an internal grinding device according to an embodiment of the present invention. 1 is a plan view of an internal grinding device according to an embodiment of the present invention. It is a longitudinal cross-sectional view of the workpiece holding apparatus of the internal grinding apparatus which concerns on embodiment of this invention.

Hereinafter, an internal grinding device according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an outline of an internal grinding device 1 according to an embodiment of the present invention. In the following description, the left-right horizontal direction as viewed from the front on the operator side is appropriately referred to as “Z direction”, and the front-rear horizontal direction is appropriately referred to as “X direction”.

  As shown in FIG. 1, the internal grinding device 1 of the present invention has a first grinding wheel 31 and a second grinding wheel 41, and includes a first grinding wheel 31 and a second grinding wheel. 41 is an apparatus that grinds the inner periphery of the hole of the workpiece W from both ends of the cylindrical workpiece W.

The internal grinding device 1 includes a base 10, a workpiece support device 20, a first grinding unit 30, and a second grinding unit 40.
The base 10 is a base that is installed on the floor surface or the like and supports the work support device 20, the first grinding unit 30, and the second grinding unit 40, and is formed in a substantially rectangular parallelepiped shape that is long in the Z direction.

  A pair of rails 11 and 12 that support the first grinding unit 30 and the second grinding unit 40 are provided on the upper portion of the base 10. The rail 11 and the rail 12 extend in the Z direction, and substantially V-shaped grooves are formed in the upper portions of the rails 11 and 12, respectively.

  The workpiece support device 20 is a device that rotatably supports the workpiece W, and is fixed to the upper portion of the base 10 so as to straddle the pair of rails 11 and 12. As for the workpiece | work W supported by the workpiece | work support apparatus 20, a rotating shaft faces the Z direction. That is, the cylindrical workpiece W is supported so that the opening thereof faces in the left-right direction. The work support device 20 includes a rotation drive device 29 such as a motor. The workpiece W supported by the workpiece support device 20 is driven to rotate by the rotation drive device 29.

  The first grinding unit 30 is a device that supports the first grinding wheel 31 so as to be movable in the horizontal direction and rotationally drives the first grinding wheel 31. The first grinding unit 30 includes a slide table 36 that is movably supported on the rails 11 and 12 of the base 10. The slide table 33 is supported on the slide table 36 so as to be movable in the X direction. A wheel head 32 is provided at the upper part of the slide table 33, and the first grinding wheel 31 is rotatably supported on the wheel head 32 via a wheel shaft extending in the Z direction. Has been.

  The second grinding unit 40 is a device that supports the second grinding wheel 41 so as to be movable in the horizontal direction and rotationally drives the second grinding wheel 41. The second grinding unit 40 has a slide table 46 movably supported on the rails 11 and 12 of the base 10. A slide table 43 is supported on the upper portion of the slide table 46 so as to be movable in the X direction. A wheel head 42 is provided at the upper part of the slide table 43, and a second grinding wheel 41 is rotatably supported on the wheel head 42 via a wheel shaft extending in the Z direction. Has been.

  The internal grinding device 1 may be provided with other devices such as a grinding wheel cover and a grinding fluid supply device which are not shown.

  FIG. 2 is a front view of the internal grinding device 1. As shown in FIG. 2, the work support device 20 is fixed to the upper part of the base 10 and is provided at the approximate center in the left-right direction of the base 10. The first grinding unit 30 is disposed on one end side, specifically, the left side of the workpiece W supported by the workpiece support device 20. The second grinding unit 40 is disposed on the other end side of the workpiece W supported by the workpiece support device 20, specifically, on the right side.

  The first grinding unit 30 and the second grinding unit 40 are slidable on the rails 11 and 12, respectively. Thereby, the 1st grinding unit 30 and the 2nd grinding unit 40 are moved to a Z direction, and the 1st grinding wheel 31 and the 2nd grinding wheel 41 are inserted and extracted from the hole of work W, respectively. be able to.

  FIG. 3 is a plan view of the internal grinding apparatus 1. As shown in FIG. 3, the slide table 36 of the first grinding unit 30 is slidably supported with respect to the rails 11 and 12 via rolling elements such as cylindrical rollers. The slide table 36 is fixed to a ball screw nut (not shown) that is screwed onto a ball screw shaft 13 as a driving force transmission device. For example, a servo motor 15 as a driving device is connected to the ball screw shaft 13, and when the servo motor 15 is driven, the ball screw shaft 13 is rotated, whereby the slide table 36 is moved in the Z direction. Move to.

  Similarly to the slide table 36 of the first grinding unit 30, the slide table 46 of the second grinding unit 40 is slidably supported on the rails 11 and 12 via rolling elements such as cylindrical rollers. The slide table 46 is fixed to a ball screw nut (not shown) that is screwed to the ball screw shaft 14 serving as a driving force transmission device. For example, a servo device serving as a driving device connected to the ball screw shaft 14 is a servo. It is driven by the motor 16 and moves in the Z direction.

  The 1st grinding unit 30 and the 2nd grinding unit 40 are supported on the common rail 11 and the rail 12 with which the straightness was ensured with high precision. As a result, the first grinding unit 30 and the second grinding unit 40 are aligned with each other with high accuracy in the X direction. Therefore, the holes at both ends of the workpiece W (see FIG. 2) can be ground with high accuracy within a desired geometric tolerance.

  Moreover, the 1st grinding unit 30 and the 2nd grinding unit 40 are suppressed by the shift | offset | difference of a X direction by being supported by the rails 11 and 12 by which upper part was formed in the substantially V shape. Thereby, the workpiece | work W can be ground with high precision.

  The first grinding unit 30 includes rails 34 and 35 provided on the slide table 36 and extending in the X direction. The rails 34 and 35 are, for example, sliding linear motion guides, and a slide table 33 is slidable in the X direction on the top of the rails 34 and 35.

  The slide table 33 is fixed to a ball screw nut (not shown) that is screwed onto a ball screw shaft 37 as a driving force transmission device. For example, a servo motor 38 as a driving device is attached to one end of the ball screw shaft 37, and the ball screw shaft 37 is rotated by being driven by the servo motor 38, whereby the slide table 33 is moved in the X direction. Moving.

  Further, the second grinding unit 40 includes rails 44 and 45 provided on the slide table 46 and extending in the X direction. The rails 44 and 45 are, for example, sliding linear motion guides, and a slide table 43 is slidable in the X direction above the rails 44 and 45.

  The slide table 43 is fixed to a ball screw nut (not shown) that is screwed to a ball screw shaft 47 as a driving force transmission device. For example, a servo motor 48 as a driving device is attached to the ball screw shaft 47, and the slide table 43 is driven by the servo motor 48 and moves in the X direction.

  As described above, by moving the slide tables 33 and 43 in the X direction, the first grinding wheel 31 and the second grinding wheel 41 can be moved in the cutting direction. As a result, the rotation axes of the first grinding wheel 31 and the second grinding wheel 41 can be made to coincide with each other with high accuracy, and the holes at both ends of the workpiece W can be made high so as to be within a predetermined geometric tolerance. It can be finished with precision.

  Further, since the first grinding wheel 31 and the second grinding wheel 41 can be independently moved in the X direction, the first grinding wheel 31 and the second grinding wheel with respect to the rotation axis of the workpiece W are used. Grinding can be performed by individually setting the amount of eccentricity of the rotation shaft of the shim 41. Therefore, even when holes of different diameters are ground at both ends of the workpiece W, the holes of the workpiece W can be finished with high accuracy within a predetermined dimensional accuracy range.

  As described above, the first grinding unit 30 and the second grinding unit 40 are movable in the X direction and the Z direction, respectively. Thereby, in the internal grinding apparatus 1, the 1st grinding wheel 31 and the 2nd grinding wheel 41 are each inserted in the hole of the workpiece | work W, and the inner periphery of a hole is ground simultaneously from the right-and-left both ends of the workpiece | work W. Can do. Therefore, the grinding time can be shortened as compared with the case where the inner circumference of the hole of the workpiece W is ground one by one by one grinding wheel as in the conventional internal grinding apparatus.

  Still further, since the first grinding unit 30 and the second grinding unit 40 can move in the X direction and the Z direction, respectively, the first grinding wheel 31 and the second grinding wheel 41 allow the workpiece to be moved. The inner circumference of the holes at both ends of W can be ground with high accuracy.

  Specifically, the first grinding wheel 31 and the second grinding wheel 41 that independently move in the radial direction of the workpiece W allow the holes at both ends of the workpiece W to have concentricity and coaxiality with high accuracy. Secured and each ground within a desired dimensional tolerance.

  As described above, in the internal grinding apparatus 1, the grinding time is shortened by simultaneous machining from both ends of the workpiece W to increase the productivity of the grinding processing, and the holes at both ends of the workpiece W are highly accurate in dimensional tolerance and geometry. Tolerance is ensured and the quality of the grinding process can be improved.

  Moreover, the workpiece | work support apparatus 20 may be provided so that adjustment of the inclination of the rotating shaft of the workpiece | work W is possible. Thereby, the position of the rotating shaft of the 1st grinding wheel 31 and the 2nd grinding wheel 41 and the rotating shaft of the workpiece | work W can be finely adjusted, and the precision of a grinding process can be improved.

  Dresser devices 51 and 52 for dressing the first grinding wheel 31 and the second grinding wheel 41 are provided on both the left and right sides of the workpiece support device 20. Specifically, the dresser device 51 is provided between the first grinding unit 30 and the workpiece support device 20 on the left side of the workpiece support device 20, and performs dressing of the first grinding wheel 31. The dresser device 52 is provided between the second grinding unit 40 and the workpiece support device 20 on the right side of the workpiece support device 20 and performs dressing of the second grinding wheel 41. Thereby, the 1st grinding wheel 31 and the 2nd grinding wheel 41 can be maintained in a good state, and the precision and processing quality of grinding can be maintained.

  Further, since the two dresser devices 51 and 52 are provided, the first grinding wheel 31 and the second grinding wheel 41 can be dressed at the same time, and the efficiency of dressing work can be improved. .

  FIG. 4 is a longitudinal sectional view of the workpiece support device 20. As illustrated in FIG. 4, the workpiece support device 20 includes a rotating body 21 that rotates while supporting the workpiece W, and a base body portion 28 that rotatably supports the rotating body 21.

The rotating body 21 is formed in a substantially cylindrical shape, and is supported rotatably with respect to the base portion 28 by a substantially cylindrical fluid hydrostatic bearing 27 provided on the outer periphery of the rotating body 21.
On the left side of the base portion 28, for example, a pulley 25 is rotatably supported via a bearing 26 such as a deep groove ball bearing. A joint flange 24 for transmitting rotational power is provided at the left end of the rotating body 21. The joint flange 24 is fixed to the rotating body 21 and the pulley 25 by bolts and pins (not shown).

  A belt or the like (not shown) attached to the rotation drive device 29 (see FIG. 1) is wound around the pulley 25. When the rotation driving device 29 is driven, the pulley 25 is rotated, the joint flange 24 is rotated, and thereby the rotating body 21 is rotated.

  Note that, as described above, the pulley 25 is supported by the base portion 28 via the bearing 26, whereby the base portion 28 can receive the tension of the belt wound around the pulley 25. In addition, a bush or the like made of an elastic body may be provided between the hole and the bolt or the like at a connection portion such as a bolt or a pin that fixes the joint flange 24 and the pulley 25. Thereby, slight tension in the radial direction of the pulley 25 due to the tension of the belt acting on the pulley 25 and the movement of the rolling element of the bearing 26 can be absorbed by the bush or the like, and the deviation of the rotating body in the radial direction is suppressed. can do. Therefore, highly accurate grinding can be performed.

  The hydrostatic bearing 27 has oil supply means (not shown) for supplying high-pressure bearing oil between the hydrostatic bearing 27 and the rotating body 21 via the oil supply hole 27c. Further, near the left and right ends of the hydrostatic bearing 27, contact type oil seals (not shown) are provided. The periphery of the bearing surface is sealed by the oil seal so that the bearing oil supplied from the oil supply means does not leak from between the hydrostatic bearing 27 and the rotating body 21.

  By supplying the bearing oil by the oil supply means, a bearing oil film is formed in the gap between the hydrostatic bearing 27 and the rotating body 21 serving as a bearing surface, and the rotating body 21 is supported by the bearing oil film. Is done. Thereby, while being able to rotate the rotary body 21 smoothly, the shift | offset | difference to the radial direction at the time of rotation of the rotary body 21 is suppressed, and a highly accurate roundness hole processing is implement | achieved.

  The rotating body 21 is formed in a stepped shaft shape so that the outer diameter on one end side is smaller than the outer diameter on the other end side. Specifically, the rotating body has a small diameter portion 21b having a small outer diameter on the left end side and a large diameter portion 21c having a large outer diameter on the right end side.

  Corresponding to the small diameter portion 21b and the large diameter portion 21c of the rotating body 21, the bearing surface of the hydrostatic bearing 27 also has a small diameter portion 27a having a small inner diameter on the left end side and a large diameter portion 27b having a large inner diameter on the right end side. Is formed.

  As described above, the rotating body 21 has the small-diameter portion 21b and the large-diameter portion 21c, and the small-diameter portion 27a and the large-diameter portion 27b are formed on the bearing surfaces corresponding to the small-diameter portion 21b and the large-diameter portion 21c. The work of assembling the rotating body to the pressure bearing 27 is facilitated.

  Further, the rotating body 21 is formed in a stepped shaft shape having a small diameter portion 21b and a large diameter portion 21c, and the inner diameter of the hydrostatic bearing 27 is correspondingly stepped having a small diameter portion 27a and a large diameter portion 27b. By being formed, the hydrostatic bearing 27 can support the load in the rotation axis direction at the step portion between the small diameter portion 27a and the large diameter portion 27b. That is, the hydrostatic bearing 27 also functions as a thrust bearing. Thereby, the shake of the workpiece W in the rotation axis direction can be suppressed, and high-precision grinding can be performed.

  The work support device 20 includes a pair of holders 22 and 23 formed in a substantially annular shape. The workpiece W is inserted into the inner diameter holes formed in the holders 22 and 23. Specifically, the holders 22 and 23 are inserted from the left end side of the workpiece W, the holder 22 is fitted to the outer diameter near the left end of the workpiece W, and the holder 23 is near the right end of the workpiece W. Mates to the outer diameter of The right end of the holder 23 fitted in the vicinity of the right end of the workpiece W abuts on the left side surface of the flange portion Wf formed on the right side of the workpiece W.

  Here, on the outer periphery of the holder 22 provided on the left side, a tapered outer peripheral surface 22a having a substantially conical surface whose outer diameter is reduced toward the center side of the workpiece W, that is, the right side, is formed. On the other hand, on the outer periphery of the holder 23 provided on the right side, a substantially conical tapered outer peripheral surface 23a whose outer diameter is reduced toward the center side, that is, the left side of the workpiece W is formed.

  On the other hand, a tapered inner peripheral surface 21a having a substantially conical surface is formed on the inner periphery of the hole in the vicinity of both left and right ends of the rotating body. Specifically, the taper inner peripheral surface 21 a in the vicinity of the left end of the rotating body 21 has an inner diameter reduced toward the center side, that is, the right side of the rotating body 21, and the taper inner peripheral surface in the vicinity of the right end of the rotating body 21. The inner diameter of the rotating body 21 is reduced toward the center side, that is, the left side of the rotating body 21.

  In the state where the workpiece W is attached to the rotating body 21 of the workpiece support device 20, the holders 22 and 23 are arranged so that the tapered outer peripheral surfaces 22 a and 23 a are in contact with the tapered inner peripheral surface 21 a of the rotating body 21. Fit into the hole.

  Then, the left holding tool 22 is fastened to the left end of the workpiece W by, for example, a screw 60. Accordingly, the pair of holders 22 and 23 are tightened toward the center in the Z direction of the workpiece W so as to be sandwiched between the screw 60 and the flange portion Wf of the workpiece W. Thereby, the taper outer peripheral surfaces 22a and 23a of the holders 22 and 23 move along the taper inner peripheral surface 21a of the rotating body 21, and are pressed in the inner diameter direction by the taper inner peripheral surface 21a. Therefore, the workpiece W is fastened in the inner diameter direction by the holders 22 and 23 and fixed to the rotating body 21.

  Thus, the work W is fixed to the rotating body 21 by fitting the holders 22 and 23 having the tapered outer peripheral surfaces 22a and 23a to the rotating body 21 formed with the tapered inner peripheral surface 21a. In addition, the rotation axis of the rotating body 21 can be easily aligned with high accuracy. Thereby, the centering operation | work for aligning the rotating shaft of the workpiece | work W and the rotary body 21 of the workpiece | work support apparatus 20 becomes easy, and while working efficiency can be improved, processing precision can be improved.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Internal grinding apparatus 10 Base 11, 12 Rail 20 Work support apparatus 21 Rotating body 21a Tapered inner peripheral surface 22, 23 Holder 22a, 23a Taper outer peripheral surface 27 Hydrostatic bearing 28 Base part 30 First grinding unit 31 First 1 grinding wheel 32 wheel head 40 second grinding unit 41 second grinding wheel 42 wheel head

Claims (3)

An internal grinding device for grinding the inner periphery of a hole in a cylindrical workpiece,
A workpiece support device for rotatably supporting the workpiece;
A first grinding unit disposed on one end side of the workpiece;
A second grinding unit disposed on the other end side of the workpiece;
A first grinding wheel that is rotatably supported by the first grinding unit and is inserted into the hole of the workpiece from the one end side;
A second grinding wheel that is rotatably supported by the second grinding unit and is inserted into the hole of the workpiece from the other end side;
The internal grinding apparatus according to claim 1, wherein the first grinding unit and the second grinding unit are movable in a rotation axis direction of the workpiece and a direction perpendicular to the rotation axis direction, respectively. A pair of rails extending in the rotation axis direction;
The internal grinding device according to claim 1, wherein the first grinding unit and the second grinding unit are supported on the rail so as to be slidable along the rail. The work support device includes a rotating body that supports and rotates the work, and a base portion that rotatably supports the rotating body,
The internal grinding device according to claim 1, wherein the rotating body is supported by the base portion by a hydrostatic bearing.

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