JP7546432B2 - Roller grinding device and carrier - Google Patents

Description

The present invention relates to a roller grinding device and a carrier used in the roller grinding device.

Conventionally, in roller bearings such as cylindrical roller bearings and tapered roller bearings, there are known rollers that have crownings formed on both ends of the rolling surface in the axial direction of the roller to prevent excessive contact pressure (edge stress) from occurring at the roller ends.

JP 2010-017788 A discloses a roller grinding device for forming a crowning portion on a workpiece by through-field grinding.

JP 2010-017788 A

However, in the roller grinding device described in JP 2010-017788 A, the roller grinding device is configured to suppress variation in the position of the workpiece in the direction along the workpiece's rotation axis by only the force of gravity acting on the workpiece.

However, during grinding, forces other than gravity are also applied to the workpiece due to the rotation and grinding of the workpiece. Therefore, depending on the grinding conditions, gravity acting on the workpiece alone may not be enough to sufficiently suppress the variation in the position of the workpiece in the direction along its rotation axis. When a roller is ground under such grinding conditions, the position of the crowning portion in the axial direction of the roller will vary.

The main objective of the present invention is to provide a roller grinding device and carrier that can reduce axial positional variation of the crowning portion of the roller and variation in outer diameter dimension compared to conventional roller grinding devices.

The roller grinding device according to the present invention is a roller grinding device for grinding a workpiece, and includes a first platen having a workpiece drive surface, a second platen having a grinding surface facing the workpiece drive surface in a direction intersecting the workpiece drive surface, a carrier disposed between the workpiece drive surface and the grinding surface and having a pocket formed therein for accommodating the workpiece, and a guide portion for guiding an end face of the workpiece accommodated in the pocket. The workpiece drive surface is arranged to rotate in a first direction. The carrier is arranged to rotate in a direction opposite to the first direction. The carrier is arranged so that the axis of rotation of the workpiece accommodated in the pocket and in contact with the workpiece drive surface and the grinding surface is inclined relative to the radial direction of the carrier.

In the roller grinding device, the carrier has a first end facing the pocket on the front side in the opposite direction, and a second end facing the first end across the pocket in the opposite direction. When a first imaginary line segment is introduced that extends along the radial direction of the carrier through a first midpoint between the inner circumferential end of the first end and the inner circumferential end of the second end in the opposite direction in plan view, and a second imaginary line segment is drawn symmetrically with the second end relative to the first imaginary line segment, the first end is inclined with respect to the second imaginary line segment.

In the above roller grinding device, the first end may be inclined toward the rear in the opposite direction relative to the second imaginary line segment in a plan view.

In the above roller grinding device, in a plan view, a third virtual line segment connecting the first midpoint and a second midpoint between the outer peripheral end of the first end and the outer peripheral end of the second end in the opposite direction may be inclined toward the rear side in the opposite direction relative to the first virtual line segment.

In the above roller grinding device, the guide portion may be arranged to guide the large end surface of the workpiece.

In the above roller grinding device, the first end may be inclined toward the front in the opposite direction relative to the second virtual line segment in a plan view.

In the above roller grinding device, in a plan view, a third virtual line segment connecting the first midpoint and a second midpoint between the outer peripheral end of the first end and the outer peripheral end of the second end in the opposite direction may be inclined toward the front side in the opposite direction to the first virtual line segment.

In the above roller grinding device, the guide portion may be arranged to guide the small end face of the workpiece.

In the above roller grinding device, the first direction and the opposite direction are circumferential directions centered on the first rotation axis, and the grinding surface is arranged to rotate in a second direction, the second direction is a circumferential direction centered on the second rotation axis that is inclined relative to the first rotation axis, and the front side of the second direction faces the rear side of the first direction.

The carrier according to the present invention is the carrier provided in the roller grinding device, and the opening width in the first direction on the second plate side of the pocket is narrower than the opening width in the first direction on the first plate side of the pocket.

The present invention provides a roller grinding device and carrier that can reduce variation in the position of the crowning portion in the axial direction of the roller, compared to conventional roller grinding devices.

1 is a diagram showing a roller grinding device according to an embodiment of the present invention; FIG. 2 is a partial enlarged view of the roller grinding device shown in FIG. FIG. 2 is a plan view of a carrier of the roller grinding device shown in FIG. FIG. 4 is a partial enlarged view of the carrier shown in FIG. 3 . FIG. 5 is a partial enlarged view of a modified example of the carrier shown in FIG. 4 .

The following describes an embodiment of the present invention with reference to the drawings. Note that the same or corresponding parts in the following drawings are given the same reference numbers and their description will not be repeated.

The roller grinding device 100 of this embodiment is a device that grinds the entire outer diameter surface of a workpiece W (see FIG. 2) to process the workpiece W into a roller to be used in a roller bearing. The roller grinding device 100 processes the workpiece W into a roller. The roller has end faces formed on both ends of the roller's rolling shaft and an outer diameter surface connecting the end faces. The outer diameter surface has a straight portion where the outer diameter is constant in the direction along the rolling shaft, and a crowning portion where the outer diameter is gradually reduced from the straight portion toward the end face.

Figure 1 is a diagram showing a roller grinding device 100 according to the present embodiment. Figure 2 is a partially enlarged view of the roller grinding device shown in Figure 1. In Figure 2, each member is illustrated with reference to the first rotation axis O1. Figure 3 is a plan view of the carrier 3 as viewed from the second platen 2 side. Figure 4 is a partially enlarged view of the carrier 3. Note that the guide portion 4 is omitted from Figures 1 and 4. The first platen 1 is omitted from Figure 3.

As shown in Figures 1 and 2, the roller grinding device 100 according to this embodiment includes a first platen 1, a second platen 2, a carrier 3, and a guide section 4.

The first platen 1 is configured as a driven grinding wheel platen. The first platen 1 has a workpiece driving surface 1a and a first rotating shaft portion 1b. The workpiece driving surface 1a is connected to one end of the first rotating shaft portion 1b, and is arranged to rotate in a first direction A by the first rotating shaft portion 1b. The first direction A is a circumferential direction centered on a first rotating axis O1 extending along a direction intersecting with the workpiece driving surface 1a. The workpiece driving surface 1a has a plane intersecting with the first rotating axis O1. The first rotating axis O1 extends in a direction intersecting with the vertical direction. In other words, the workpiece driving surface 1a is inclined with respect to a horizontal plane. The workpiece driving surface 1a comes into contact with the outer peripheral surface of the workpiece during grinding to drive the workpiece.

The second plate 2 is configured as a grinding wheel plate. The second plate 2 has a grinding surface 2a and a second rotating shaft portion 9. The grinding surface 2a is provided so as to face the workpiece drive surface 1a in a direction along the first rotating axis O1. The grinding surface 2a is connected to one end of the second rotating shaft portion 9 and is provided so as to rotate in a second direction C by the second rotating shaft portion 9. The second direction C is a circumferential direction centered on the second rotating axis O2 extending along a direction intersecting with the grinding surface 2a. The second rotating axis O2 extends in a direction intersecting with the vertical direction. In other words, the grinding surface 2a is inclined with respect to a horizontal plane. The second rotating axis O2 is inclined to form an angle θ with respect to the first rotating axis O1, for example. The angle θ is adjusted depending on the size of the workpiece W and the amount of crowning, and is, for example, less than 1 degree. The grinding surface 2a has a crowning portion. In a cross section including the second rotation axis O2 of the grinding surface 2a, the shape of the crowning portion may be any crowning shape, for example, a logarithmic crowning shape that is approximated to a logarithmic curve, a single R shape in which the radius of curvature R is substantially constant, or a compound R shape in which multiple arcs with different radii of curvature R are smoothly connected. The grinding surface 2a comes into contact with the outer peripheral surface of the workpiece during grinding and grinds it.

The carrier 3 is disposed between the work driving surface 1a and the grinding surface 2a. The carrier 3 is disposed at a distance from each of the work driving surface 1a and the grinding surface 2a in a direction along the first rotation axis O1. The carrier 3 has a third rotation shaft portion 5. The carrier 3 is connected to one end of the third rotation shaft portion 5, and is arranged to rotate in a third direction B by the third rotation shaft portion 5. The third direction B is a circumferential direction centered on the first rotation axis O1, and is opposite to the first direction A.

The carrier 3 has a plurality of pockets 8 formed therein for accommodating the workpieces W. The plurality of pockets 8 are arranged at intervals from one another in the third direction B. The plurality of pockets 8 open onto the outer peripheral surface of the carrier 3 in the radial direction relative to the first rotation axis O1.

The carrier 3 has a plurality of first end faces 7A and a plurality of second end faces 7B. One first end face 7A and one second end face 7B are arranged to face each other across one pocket 8 in the third direction B. Each first end face 7A is arranged forward of the pocket 8 in the third direction B and faces the pocket 8. Each second end face 7B is arranged rearward of the pocket 8 in the third direction B and faces the pocket 8. The end of the first end face 7A that is located rearward in the third direction B and on the second board 2 side in the direction along the first rotation axis O1 is defined as the first end face 70A. The end of the second end face 7B that is located forward in the third direction B and on the second board 2 side in the direction along the first rotation axis O1 is defined as the second end face 70B.

That is, the carrier 3 has a plurality of first ends 70A and a plurality of second ends 70B. One first end 70A and one second end 70B are arranged to face each other across one pocket 8 in the third direction B. Each first end 70A is arranged forward of the pocket 8 in the third direction B and faces the pocket 8. Each second end 70B is arranged rearward of the pocket 8 in the third direction B and faces the pocket 8.

The first end face 7A is inclined toward the first platen 1 with respect to the direction along the first rotation axis O1. The second end face 8A is aligned along the direction along the first rotation axis O1. In other words, the shape of the pocket 8 viewed from the radial direction is trapezoidal. In a plan view, the distance between the first end 70A and the second end 70B in the third direction B is narrower than the outer diameter of the workpiece W. The thickness of the carrier 3 in the direction along the first rotation axis O1 is thinner than the outer diameter of the workpiece W.

As shown in FIG. 4, in a plan view, the midpoint of the third direction B between the inner peripheral end of the first end 70A and the inner peripheral end of the second end 70B is the first midpoint C1. In a plan view, the midpoint of the third direction B between the outer peripheral end of the first end 70A and the outer peripheral end of the second end 70B is the second midpoint C2. A virtual line extending along the radial direction of the carrier 3 through the first midpoint C1 is the first virtual line segment L1. A virtual line drawn symmetrically with the second end 70B with respect to the first virtual line segment L1 is the second virtual line segment L2. A virtual line connecting the first midpoint C1 and the second midpoint C2 is the third virtual line segment L3. The rotation axis of the workpiece W is the third rotation axis O3. The rotation axis of the workpiece W is the rotation axis of the workpiece W when the workpiece W is ground in the roller grinding device 100.

In a plan view, the first end 70A is inclined with respect to the second virtual line segment L2. The first end 70A is inclined toward the rear side in the third direction B with respect to the second virtual line segment L2. The inclination angle φ of the first end 70A with respect to the second virtual line segment L2 is 5 minutes or more and 5 degrees or less.

The third virtual line segment L3 is inclined toward the rear side in the third direction B with respect to the first virtual line segment L1. The inclination angle ψ of the third virtual line segment L3 with respect to the first virtual line segment L1 is 5 minutes or more and 5 degrees or less, and is equal to the inclination angle φ, for example.

From a different perspective, the carrier 3 is arranged so that the third rotation axis O3 of the workpiece W accommodated in the pocket 8 is inclined toward the rear side of the third direction B with respect to the first virtual line segment L1. The inclination angle X of the third rotation axis O3 with respect to the first virtual line segment L1 is greater than or equal to 5 minutes and less than or equal to 5 degrees, and is, for example, equal to the inclination angle φ.

As shown in FIG. 3, in a plan view, the guide portion 4 is provided in an arc shape along the circumferential direction with respect to the first rotation axis O1. As shown in FIG. 2 and FIG. 3, the guide portion 4 is disposed on the outer periphery side of the carrier 3. The guide portion 4 is disposed so as to overlap with the pocket 8 in the radial direction. The guide portion 4 is fixed to the first platen 1. The guide portion 4 has an inner peripheral surface facing the carrier 3.

As shown in FIG. 1, in the roller grinding device 100, the first platen 1 and the carrier 3 are arranged so that the first rotation axis O1 intersects with the vertical direction. The second platen 2 is arranged so that the second rotation axis O2 intersects with the vertical direction.

The first board 1 is rotatably supported by, for example, the first board support base 12. The first board 1 is rotated in the first direction A by a motor 16 provided on the first board support base 12 as a drive source. Specifically, the first rotating shaft portion 1b of the first board 1 is rotatably supported by the first board support base 12 via a bearing (not shown), and is connected to the output shaft 16a of the motor 16 via a pulley 17, a belt 18, and a pulley 19. As a result, the rotation of the output shaft 16a of the motor 16 is transmitted to the first rotating shaft portion 1b of the first board 1 via the pulley 17, the belt 18, and the pulley 19. The first rotating shaft portion 1b is provided in a cylindrical shape.

The carrier 3 is supported by the first board support base 12 so as to be rotatable independently of the first board 1. The carrier 3 is driven to rotate in the third direction B opposite to the first board 1 by the motor 20 provided on the first board support base 12 as a driving source. Specifically, the third rotating shaft portion 5 of the carrier 3 penetrates the work driving surface 1a of the first board 1 and is rotatably supported inside the first rotating shaft portion 1b via a bearing not shown. The third rotating shaft portion 5 is arranged concentrically with the first rotating shaft portion 1b. The third rotating shaft portion 5 is connected to the output shaft 20a of the motor 20 via the pulley 21, the belt 22, and the pulley 23. As a result, the rotation of the output shaft 20a of the motor 20 is transmitted to the third rotating shaft portion 5 of the carrier 3 via the pulley 21, the belt 22, and the pulley 23.

2, the second platen 2 is rotatably supported by the second platen support base 14. The second platen 2 is rotated by a motor 25 provided on the second platen support base 14 as a drive source. Specifically, the second rotating shaft portion 9 of the second platen 2 is rotatably supported by the second platen support base 14 via a bearing (not shown). The second rotating shaft portion 9 is connected to the output shaft 25a of the motor 25 via a pulley 26, a belt 27, and a pulley 28. As a result, the rotation of the output shaft 25a of the motor 25 is transmitted to the second rotating shaft portion 9 via the pulley 26, the belt 27, and the pulley 28. The second platen 2 is detachably attached to, for example, a grinding wheel mounting disc 10 provided at one end of the second rotating shaft portion 9.

The second board support table 14 is supported by the guide table 13 so that it can move back and forth. The guide table 13 has a rail 29 that extends along the second rotation axis O2, and the second board support table 14 is arranged to move along the rail 29. The second board support table 14 is driven to move back and forth by a motor 30 provided on the guide table 13 as a drive source. Specifically, the second board support table 14 is connected to the output shaft of the motor 30 via a ball screw 31 and a nut 32 that screws onto the ball screw 31. As a result, the rotation of the output shaft of the motor 30 is converted into the forward and backward movement of the second board support table 14 via the ball screw 31 and the nut 32. The second board support table 14 is connected to a balance weight 34 via a cable 33.

The first board support base 12 and the guide base 13 are fixed onto the bed 11. The bed 11 has an upwardly inclined surface 11a, and the first board support base 12 and the guide base 13 are fixed to the inclined surface 11a. The guide base 13 is positioned above the first board support base 12.

Each of the motors 16, 20, 25, and 30 is controlled by the control unit 37 shown in FIG. 1. The control unit 37 individually controls the rotation speed of the motor 16 that rotates the first platen 1 and the motor 20 that rotates the carrier 3.

The second rotation axis O2 of the second platen 2 is inclined at an angle θ with respect to the first rotation axis O1 of the first platen 1. As a result, between the second platen 2 and the carrier 3, there is a wide gap region where the gap between the second platen 2 and the carrier 3 is wider than the outer diameter of the work W, and a narrow gap region where the gap between the second platen 2 and the carrier 3 is equal to or smaller than the outer diameter of the work W. In the wide gap region, there are provided a work supply unit 35 that supplies the work W from the outer peripheral end side of the pocket 8, and a work discharge unit 36 that discharges the work W from the outer peripheral end side of the pocket 8. The work discharge unit 36 is disposed at a distance from the work supply unit 35 in the third direction B, and is disposed, for example, so as to face each other across the first rotation axis O1.

The roller grinding device 100 may further include an adjustment unit (not shown) that adjusts the inclination angle θ of the second rotation axis O2 relative to the first rotation axis O1.

Next, grinding processing using the roller grinding device 100 will be described. As shown in FIG. 2, the first platen 1, the second platen 2, and the carrier 3 are rotated while the second rotation axis O2 of the second platen 2 is inclined at an angle θ with respect to the first rotation axis O1 of the first platen 1. The first platen 1 rotates along the first direction A, the second platen 2 rotates along the second direction C, and the carrier 3 rotates along the third direction B. The rotation speed of the first platen is 10 times or more faster than the rotation speed of the carrier 3. The rotation speed of the carrier 3 may be a constant rotation speed depending on the workpiece W to be processed, or may be changed to improve processing accuracy.

Next, while the first platen 1, the second platen 2, and the carrier 3 are being rotated, the workpiece W is supplied from the workpiece supply unit 35 into the pocket 8 of the carrier 3. The workpiece W is sent to the narrow gap area by the rotation of the carrier 3 along the third direction B. In the narrow gap area, the first platen 1 and the second platen 2 rotate in opposite directions, causing the workpiece W to revolve and rotate on its axis. The workpiece W shown in Figures 2 and 3 revolves counterclockwise in Figure 3 and rotates clockwise in Figure 2.

The workpiece W is ground by the second platen 2 in the narrow gap region. Because the grinding surface 2a has a crowning portion, a crowning portion is formed on the outer diameter surface of the workpiece W. In addition, because the second rotation axis O2 of the second platen 2 is inclined by an angle θ with respect to the first rotation axis O1 of the first platen 1, a notch is formed in the workpiece W during the grinding process.

The workpiece W that has been ground in the narrow gap area is sent to the workpiece discharge section 36 provided in the wide gap area, where it is discharged from the pocket 8 to the outside. In this way, the workpiece W is machined into rollers for a roller bearing.

The workpiece W in the narrow gap region is applied with a force toward the front in the third direction B by the first platen 1. As a result, the workpiece W in the narrow gap region comes into contact with the first end 70A of the carrier 3. As shown in FIG. 4, since the first end 70A is inclined toward the rear in the third direction B with respect to the second virtual line segment L2, part of the force toward the front in the third direction B applied to the workpiece W in contact with the first end 70A is converted into a force by the first end 70A that presses the workpiece W toward the outer periphery of the carrier 3. This force presses the large end face of the workpiece W against the inner periphery of the guide section 4 and guides it. As a result, in the roller grinding device 100, fluctuations in the position of the workpiece W relative to the first rotation axis O1 in the narrow gap region are suppressed, and grinding and movement are performed smoothly and stably.

<Action and effect>
First, the problems of the conventional roller grinding device will be described. In the conventional roller grinding device, the carrier is accommodated in a pocket and is arranged so that the rotation axis of the workpiece in contact with the workpiece drive surface is along the radial direction of the carrier. From a different perspective, both ends arranged to sandwich the pocket in the rotation direction of the carrier are arranged line-symmetrically with respect to the first virtual line. That is, in the carrier of the conventional roller grinding device, the front end arranged forward of the pocket and facing the pocket is arranged so as to overlap with the second virtual line. In addition to gravity, a force capable of suppressing the variation in the position of the workpiece in the direction along the rotation axis of the workpiece is unlikely to act on the workpiece accommodated in such a carrier. For example, a workpiece accommodated in a conventional carrier receives a force directed toward the front side in the rotation direction of the second plate during grinding and comes into contact with the front end of the carrier. However, since the front end has the above-mentioned configuration, the component force of such a force in the direction along the rotation axis is not large enough to suppress the variation in the position of the workpiece as described above. As a result, in conventional roller grinding devices, the position of the crowning portion of the roller in the axial direction varies.

In contrast, the roller grinding device 100 includes a first platen 1 having a workpiece drive surface 1a, a second platen 2 having a grinding surface 2a facing the workpiece drive surface 1a in a direction intersecting the workpiece drive surface 1a, a carrier 3 arranged between the workpiece drive surface 1a and the grinding surface 2a and having a pocket 8 formed therein for accommodating the workpiece W, and a guide section 4 for guiding the end face of the workpiece W accommodated in the pocket 8. The workpiece drive surface 1a is arranged to rotate in a first direction A. The carrier 3 is arranged to rotate in a third direction B, which is the opposite direction to the first direction A. The carrier 3 is arranged so that the third rotation axis O3 of the workpiece W accommodated in the pocket 8 and in contact with the workpiece drive surface 1a and the grinding surface 2a is inclined relative to the radial direction of the carrier 3.

From a different perspective, when a first virtual line segment L1 is introduced that extends along the radial direction of the carrier 3 through a first midpoint C1 between the inner peripheral end of the first end 70A and the inner peripheral end of the second end 70B in the third direction B, and a second virtual line segment L2 is drawn symmetrically with the second end 70B with respect to the first virtual line segment L1, the first end 70A is inclined with respect to the second virtual line segment L2.

As a result, the component of the force acting on the workpiece in contact with the first end 70A of the carrier 3 in the roller grinding device 100 in the direction along the rotation axis is greater than the component of the force acting on the workpiece in contact with the front end of the carrier in a conventional roller grinding device in the direction along the rotation axis.

In particular, in the roller grinding device 100, in plan view, the first end 70A is inclined toward the rear side in the third direction B with respect to the second virtual line segment L2. From a different perspective, in plan view, the third virtual line segment L3 connecting the first midpoint C1 and the second midpoint C2 between the outer peripheral end of the first end 70A and the outer peripheral end of the second end 70B in the third direction B is inclined toward the rear side in the third direction B with respect to the first virtual line segment L1. The guide portion 4 is disposed on the outer periphery side of the pocket 8 in the radial direction. Therefore, the component force acts as a force pressing the workpiece W against the guide portion 4. As a result, the roller grinding device 100 can suppress the variation in the position of the crowning portion in the axial direction of the roller compared to the conventional roller grinding device.

In addition, the conventional roller grinding device described above is designed to form only the crowning portion based on the outer diameter of the workpiece, so the amount of cutting into the crowning portion varies due to variations in the outer diameter of the workpiece before grinding. If the outer diameter of the workpiece is relatively large, the amount of cutting into the crowning portion increases. If the outer diameter of the workpiece is relatively small, the amount of cutting into the crowning portion decreases.

In contrast, roller grinding device 100, unlike the above-mentioned conventional roller grinding device, can simultaneously form a straight portion and a crowning portion on the workpiece W. In other words, roller grinding device 100 can grind the entire outer diameter surface at the same time. Therefore, the amount of cut-in of the crowning portion with roller grinding device 100 does not depend on the variation in the outer diameter dimension of the workpiece before grinding. As a result, the variation in the amount of cut-in of the crowning portion with roller grinding device 100 is reduced compared to that with the above-mentioned conventional roller grinding device.
<Modification>
Fig. 5 is a partial enlarged view of a modified example of the carrier 3 shown in Fig. 4. Note that in Fig. 5, the illustration of the guide portion 4 is omitted.

5, in plan view, the first end 70A may be inclined toward the front side in the third direction B with respect to the second virtual line segment L2. From a different perspective, in plan view, the third virtual line segment L3 connecting the first midpoint C1 and the second midpoint C2 between the outer peripheral end of the first end 70A and the outer peripheral end of the second end 70B in the third direction B may be inclined toward the front side in the third direction B with respect to the first virtual line segment L1. In this case, the guide portion 4 may be provided to guide the small end face in the radial direction of the workpiece W.

Even in this way, the component of the force acting on the workpiece in contact with the first end 70A of the carrier 3 in the direction along the rotation axis is greater than the component of the force acting on the workpiece in contact with the front end of the carrier in a conventional roller grinding device in the direction along the rotation axis. Furthermore, the component of the force acts as a force pressing the workpiece W against the guide portion 4. As a result, the roller grinding device 100 equipped with the carrier 3 shown in FIG. 5 can also suppress variation in the position of the crowning portion in the axial direction of the roller compared to the conventional roller grinding device.

In this embodiment, the first rotation axis O1 of the first platen 1 is inclined with respect to the horizontal plane and the vertical direction, but the first rotation axis O1 of the first platen 1 may be provided along the vertical direction. In this case, gravity does not act as a force pressing the workpiece W against the guide part 4, but according to the roller grinding device 100, a part of the force acting on the workpiece in contact with the first end 70A of the carrier 3 acts as a force pressing the workpiece W against the guide part 4. As a result, such a roller grinding device 100 can also suppress the variation in the position of the crowning part in the axial direction of the roller compared to the above-mentioned conventional roller grinding device. Furthermore, in such a roller grinding device 100, the workpiece W is placed on the work drive surface 1a of the first platen 1, so that the workpiece W is more likely to rotate on its own axis than the roller grinding device 100 shown in FIG. 1. As a result, the manufacture and adjustment of such a roller grinding device 100 is easier than that of the roller grinding device 100 shown in FIG. 1. Also, the first rotation axis O1 of the first platen 1 may be arranged along the horizontal direction. In that case, the work supply unit 35 may be arranged above the carrier 3, and the work discharge unit 36 may be arranged below the carrier 3. In this way, the work can be easily supplied to and discharged from the pocket.

The roller grinding device 100 may also be configured to grind the entire outer diameter surface of the workpiece W into a crowning shape.

The embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is indicated by the claims rather than the above description, and is intended to include the meaning equivalent to the claims and all modifications within the scope.

1 First plate, 1a Work drive surface, 1b First rotating shaft portion, 2 Second plate, 2a Grinding surface, 3 Carrier, 4 Guide portion, 5 Third rotating shaft portion, 7A First end surface, 7B Second end surface, 8 Pocket, 9 Second rotating shaft portion, 10 Grindstone mounting disk, 11 Bed, 11a Inclined surface, 12 First plate support base, 13 Guide base, 14 Second plate support base, 16, 20, 25, 30 Motor, 16a, 20a, 25a Output shaft, 17, 19, 21, 23, 26, 28 Pulley, 18, 22, 27 Belt, 29 Rail, 31 Ball screw, 32 Nut, 33 Cable, 34 Balance weight, 35 Work supply portion, 36 Work discharge portion, 37 Control portion, 70A First end portion, 70B Second end, 100 roller grinding device.

Claims (9)

A roller grinding device for grinding a workpiece, comprising:
A first platen having a work driving surface;
A second platen having a grinding surface facing the workpiece drive surface in a direction intersecting the workpiece drive surface;
a carrier disposed between the work driving surface and the grinding surface and having a pocket formed therein for accommodating the work;
a guide portion for guiding an end surface of the workpiece accommodated in the pocket,
The workpiece driving surface is provided to rotate in a first direction, which is a circumferential direction around a first rotation axis,
The carrier is arranged to rotate in a direction opposite to the first direction,
the carrier is accommodated in the pocket and is provided such that the rotation axis of the workpiece in contact with the workpiece driving surface and the grinding surface is inclined with respect to a radial direction of the carrier;
the carrier has a first end surface and a second end surface arranged to face each other across the pocket in the opposite direction,
the first end surface is disposed forward of the pocket in the opposite direction and has a first end facing the pocket on the front side in the opposite direction;
the second end surface is disposed rearward of the pocket in the opposite direction and has a second end surface facing the first end surface across the pocket in the opposite direction;
when a first virtual line segment extending along a radial direction of the carrier passing through a first midpoint between an inner peripheral end of the first end and an inner peripheral end of the second end in the opposite direction, a second virtual line segment drawn symmetrically with the second end with respect to the first virtual line segment, and a third virtual line segment connecting the first midpoint and a second midpoint between an outer peripheral end of the first end and an outer peripheral end of the second end in the opposite direction are introduced, the first end is inclined with respect to the second virtual line segment, the third virtual line segment is inclined with respect to the first virtual line segment toward a side on which the first end is inclined with respect to the second virtual line segment, and an inclination angle of the first end with respect to the second virtual line segment is equal to an inclination angle of the third virtual line segment with respect to the first virtual line segment,
the first end surface is provided so as to be inclined toward the first platen with respect to a direction along the first rotation axis,
A roller grinding device, wherein the second end surface is provided along a direction along the first rotation axis. The roller grinding device according to claim 1, wherein, in a plan view, the first end is inclined toward the rear side in the opposite direction with respect to the second virtual line segment. The roller grinding device according to claim 1 or 2, wherein, in a plan view, the third virtual line segment is inclined toward the rear side in the opposite direction relative to the first virtual line segment. The roller grinding device according to claim 3, wherein the guide portion is arranged to guide the large end face of the workpiece. The roller grinding device according to claim 1, wherein, in a plan view, the first end is inclined toward the front side in the opposite direction with respect to the second virtual line segment. The roller grinding device according to claim 5, wherein, in a plan view, the third virtual line segment is inclined toward the front side in the opposite direction relative to the first virtual line segment. The roller grinding device according to claim 6, wherein the guide portion is arranged to guide the small end face of the workpiece. The grinding surface is adapted to rotate in a second direction;
the second direction is a circumferential direction about a second rotation axis that is inclined with respect to the first rotation axis,
The roller grinding device according to any one of claims 1 to 7, wherein a front side in the second direction faces a rear side in the first direction. The carrier of the roller grinding device according to any one of claims 1 to 8,
A carrier, wherein the opening width of the pocket in the first direction on the second board side is narrower than the opening width of the pocket in the first direction on the first board side.

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