Grinding wheel holding device and end face machining device

Abstract

To provide a grindstone holding device capable of grinding an end surface, etc., without machining a grindstone in advance corresponding to a curved shape of the end surface of an object to be ground or the like.SOLUTION: A grindstone holding device 1 comprises: a grindstone rotation device 57 that holds and rotates a grindstone 61 about a rotary shaft 76 extending in a horizontal direction; a rotary base 13 on which the grindstone rotation device is integrated; a base 11 that is disposed below the rotary base so as to rotatably support the rotary base via a rotary shaft 12 having a vertical axis center; and a rotation device 2 that rotates the rotary base. The rotation device has a circular-arc rack 15 in which the connection of horizontally arranged teeth is circular-arc, a pinion 17 engaged with the circular-arc rack, and a rotary motor 16 that rotates the pinion. The circular-arc rack is matched with the axis center of the rotary shaft about the curvature center of the circular-arc to be integrated on the base, and the rotary motor is integrated on the rotary base.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an apparatus for holding a grinding wheel for grinding or polishing the end face of a workpiece having a circular cross section, and an end face processing apparatus including the same.

Background Art

[0002] In the power transmission parts of rotating equipment in production machines in the manufacturing industry and transportation machines such as automobiles, various types of bearings for supporting a rotating shaft are used. Among them, for example, a tapered roller bearing receives an axial load as well as a radial load during rotation, and the large-diameter end face thereof is pressed against the inner ring (flange) by the axial load. The friction between the large-diameter end face of the tapered roller bearing and the inner ring due to this pressing accelerates the wear of each sliding surface and also causes noise. Therefore, in order to improve the durability of the bearing and obtain quietness during rotation, the large-diameter end face of the tapered roller is formed into a curved surface with a reduced contact area with the inner ring.

[0003] Patent Document 1 discloses a technique for grinding the large-diameter end face (curved surface) of a tapered roller using a 5-axis control machining center. In this technique, the small-diameter end face side of the tapered roller (a workpiece having a rolling surface shape formed on its circumferential surface, hereinafter referred to as "workpiece") is fixed by the jaws of a mechanical chuck provided on the spindle head of the machining center, the workpiece is rotated, and the large-diameter end face is approximated to a spherical surface by grinding with a cutting tool mounted on the spindle. The cutting tool is replaced with a cup-shaped grinding wheel, which is also rotated to machine the rotating large-diameter end face.

[0004] In the technique disclosed in Patent Document 1, when fixing the workpiece to the mechanical chuck, a jig is used to increase the apparent outer diameter of the workpiece and improve the positioning accuracy in the direction orthogonal to its central axis. The technology disclosed in Patent Document 1 is easy to implement in that it uses a highly versatile 5-axis control machining center. However, in this technology, the workpiece is gripped by the mechanical chuck of the spindle headstock. Especially when the clamping surface of the mechanical chuck (jaw) does not match the shape of the outer diameter surface (rolling surface) of the workpiece, the gripping force of the mechanical chuck may concentrate on a small area on the circumferential surface of the workpiece, and there is a risk of damage to the circumferential surface of the workpiece.

[0005] Also, it is presumed that the shape of the receiving surface of the collet should also be "a surface that matches the rolling surface shape of the outer diameter surface of the workpiece" according to Paragraph 0032 and FIG. 3(b). From these facts, in the technology disclosed in Patent Document 1, it is necessary to consider preventing damage to the circumferential surface of the workpiece by the mechanical chuck of the 5-axis control machining center, and it is considered necessary to use a collet having a receiving surface that matches this for each rolling surface shape of the outer diameter surfaces of different workpieces.

[0006] Patent Document 2 discloses a technique in which the large-diameter end face is ground by a 2-roll·1-shooter type rotary holding device that rotates the workpiece without gripping it with a mechanical chuck or the like, and there is no risk of damage to the circumferential surface of the workpiece. The technique disclosed in Patent Document 2 sandwiches a tapered roller between a pair of rolls arranged substantially vertically, and the large-diameter end face of the tapered roller that rotates due to the rotation of the rolls is ground by the circumferential surface of a disk-shaped rotating grinding wheel whose rotation axis is horizontal. The circumferential surface of the grinding wheel has a curved concave cross-section, and this circumferential surface abuts against the large-diameter end face of the tapered roller while being biased in one horizontal direction, and a shoe is provided on the side of the tapered roller in the other horizontal direction, thereby preventing the tapered roller from falling off from the roll.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] In the invention disclosed in Patent Document 2, the peripheral surface of the disk-shaped grinding wheel must be processed into a curved concave shape having a concave-convex relationship with the curved convex shape of the large end face of the diameter of the tapered roller after grinding by a dresser or a rotary dresser in advance. Also, regarding the invention disclosed in Patent Document 1, there is no difference from the invention described in Patent Document 2 in that it is necessary to adjust the grinding surface (end face of the cup-shaped grinding wheel) of the grinding wheel in advance according to the shape of the end face of the workpiece after grinding.

[0009] However, in the invention described in Patent Document 2, the diameter of the grinding wheel is considerably larger than the diameter of the tapered roller to be processed, and the grinding wheel height (thickness) is also large. From this, the area of the peripheral surface of the grinding wheel that requires pre-processing into a curved concave shape is much larger than the area of the end face of the cup-shaped grinding wheel that requires pre-processing into an appropriate shape. The grinding apparatus described in Cited Document 2 has problems such as the difficulty of processing a hard grinding wheel into a curved concave shape, specifically, the need for a long time for processing.

[0010] The present invention has been made in view of the above problems, and an object thereof is to provide a grinding wheel holding device suitable for a two-roll one-shoe type end face processing apparatus that can hold a cup-shaped grinding wheel that is easily pre-curved on the grinding surface, and an end face processing apparatus equipped with the same.

Means for Solving the Problems

[0011] The grinding wheel holding device according to the present invention Cup-shaped includes a grinding wheel rotating device that holds a grinding wheel and rotates it around a rotating shaft extending in the horizontal direction, a rotating table integrated above the grinding wheel rotating device, a base disposed below the rotating table and supporting the rotating table rotatably via a rotating shaft whose axis is vertical, and a rotating device that rotates the rotating table. Further, the grinding wheel holding device has a first moving device including a lateral drive motor that reciprocates the grinding wheel rotating device in a horizontal direction orthogonal to the rotating shaft with respect to the rotating table. The rotating device has an arc rack in which a row of horizontally aligned teeth forms an arc, a pinion that meshes with the arc rack, and a rotating motor that rotates the pinion. The arc rack is integrated with the base by aligning the center of curvature of the arc with the axis of the rotating shaft, and the rotating motor is integrated with the rotating table. Both the rotating motor and the lateral driving motor are servo motors, and the grinding wheel holding device, when the grinding wheel rotates, The reciprocating movement of the grinding wheel rotating device by the lateral drive motor is possible, and the rotation of the rotating table by the rotation motor is possible according to the position of the reciprocating movement is configured as follows.

[0012] It has a plurality of clamping devices that can disable the rotation of the rotating table relative to the base, and the clamping devices are provided on the arc rack side rather than at the center between the rotating shaft and the arc rack. Between the rotating table and the grinding wheel rotating device, there is a second moving device that reciprocates the grinding wheel rotating device in the Axis axial direction of the rotating shaft.

[0013] The end face processing device according to the present invention has the above-mentioned grinding wheel holding device, a pair of rolls that rotate the workpiece and hold the workpiece substantially above and below it, and a shoe that contacts the peripheral surface of the workpiece to prevent the workpiece from falling off. The end face of the grinding wheel of the end face processing device is formed so as to be able to contact the end face of the workpiece.

Advantages of the Invention

[0014] According to the present invention, it is possible to provide a grinding wheel holding device that can grind the end face of an object such as a grinding wheel without pre-processing it to match the curved shape of the end face of the object to be ground, etc., and an end face processing device equipped with the same.

Brief Description of the Drawings

[0015]

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Embodiments for Carrying Out the Invention

[0016] FIG. 1 is a perspective view showing the outline of the grinding wheel holding device 1, FIG. 2 is a front view of the grinding wheel holding device 1, FIG. 3 is a plan view of the grinding wheel holding device 1, FIG. 4 is a right side view of the grinding wheel holding device 1, FIG. 5 is a cross-sectional view of the rotating shaft 12, FIG. 6 is a cross-sectional view of the clamp cylinder 18, FIG. 7 is a cross-sectional view taken along the A-A arrow in FIG. 3 of the grinding wheel head 5, and FIGS. 8 to 10 are views showing the operations of the grinding wheel holding device 1. The grinding wheel holding device 1 is used for a two-roll one-shoe type end face processing device 7 that rotates the workpiece instead of gripping it to process its end face.

[0017] The grinding wheel holding device 1 includes a base 11, a rotating device 2, a forward and backward moving device 3, a lateral moving device 4, and a grinding wheel head 5. The base 11 is formed of a thick plate as a whole, and the rotating device 2, the forward and backward moving device 3, the lateral moving device 4, and the grinding wheel head 5 are provided thereon. The base 11 is substantially trapezoidal in plan view (FIG. 1), and its large bottom surface is curved convexly outward. The base 11 is provided with a rotating shaft 12 near the end of its small bottom surface side, and the rotating table 13 in the rotating device 2 rotates around the rotating shaft 12 It is integrally rotatable. The rotation axis 12 has its axis extending in the vertical direction.

[0018] The base 11 has an arcuate locking groove 14 centered on the axis of the rotation axis 12 at a position offset toward the large bottom surface side of its upper surface. The locking groove 14 is provided on the arc rack 15 side rather than at the center between the rotation axis 12 and the following arc rack 15, and its cross-sectional shape is an inverted T shape. The rotating device 2 consists of a rotating table 13, an arc rack 15, a rotating motor 16, a speed reducer, a pinion 17, and clamp cylinders 18, 18.

[0019] The rotating table 13 holds a forward and backward moving device 3, a lateral moving device 4, and a grinding wheel head 5 thereon. The rotating table 13 is generally in the shape of a thick plate, covers most of the base 11 and overlaps it, and is connected to the base 11 by the rotation axis 12. The rotation axis 12 is formed of a holding bolt 21, a plurality of washers 22, 22, 22, coil springs 23, 23, a pressing member 24, and bearings 25, 25 with reference to FIG. 5. In the rotation axis 12, the rotating table 13 is pressed by the pressing member receiving the biasing force of the coil springs 23, 23 and is integrally fitted to the base 11.

[0020] The teeth of the arc rack 15 are curved in an arc shape, and the teeth are arranged horizontally facing outward and fixed to the curved large bottom surface side of the base 11. The curvature of the tooth arrangement of the arc rack 15 is formed with the rotation axis 12 as the center of curvature and is fixed to the base 11. The rotating motor 16 is connected to the speed reducer, and these are fixed to the rotating table 13. A pinion 17 is attached to the secondary side of the speed reducer, and the pinion 17 is screwed to the arc rack 15. The rotating motor 16 rotates the rotating table 13 clockwise and counterclockwise with respect to the base 11 by rotating forward and backward. The rotating motor 16 is a servo motor, and its degree and speed of forward and backward rotation are controlled by a control device (not shown).

[0021] The clamping cylinder 18 is composed of a cylinder 28, a piston 29, a locking rod 30, a plurality of disc springs 31, …, 31, etc., as shown in Fig. 6. The cylinder 28 is cylindrical with a closed end (the lower end in Fig. 6) through which the locking rod 30 passes. The inner surface of the cylinder 28 allows the piston 29 to slide, and the piston 29 is exposed to the outside from the other end of the cylinder 28. The cylinder 28 is provided with a hydraulic port 32 near the other end side.

[0022] The piston 29 has a pressure-receiving surface facing the other end of the cylinder 28. The rod-equivalent part is cylindrical, with one side (the upper side in Fig. 6) closed and the locking rod 30 passing through it, and the other side is open. The locking rod 30 has a cylindrical locking portion 33 at one end of a round bar. The diameter and height of the locking portion 33 are smaller than both the width and height of the rectangular cross-section at the deepest part of the locking groove 14 provided on the base 11.

[0023] The locking rod 30 is arranged with the locking portion 33 outside the closed end side (the lower side in Fig. 6) of the cylinder 28. Its round bar part passes through the axes of the cylinder 28 and the piston 29 and is exposed outside the other end side (the upper side in Fig. 6). The locking rod 30 is indirectly fixed to the piston 29. The disc springs 31, …, 31 are accommodated in the cylindrical space formed by the closed end of the cylinder 28, the cavity of the piston 29, and the locking rod 30.

[0024] For the clamping cylinders 18, 18, their locking portions 33 are inserted into the locking grooves 14 of the base 11, and the cylinders 28 are fixed to the rotating table 13. The clamping cylinders 18, 18 are arranged at both ends in the circumferential direction of rotation (substantially the vertical direction in Fig. 3) on the rotating table 13. The clamping cylinder 18 releases hydraulic pressure when it is necessary to fix the rotating table 13 to the base 11. The piston 29 (and) the locking rod 30 are raised by the disc springs 31,…,31, and the upper surface of the locking portion 33 abuts against the locking groove 14, making the turntable 13 non-rotatable (Fig. 6(a)). When rotating the turntable 13, hydraulic pressure is applied to lower the piston 29, releasing the abutment of the locking portion 33 against the locking groove 14 and making the turntable 13 rotatable (Fig. 6(b)).

[0025] During the process of the grinding wheel head 5 performing operations such as grinding, the turntable 13 is firmly fixed to the base 11 by the pressing forces of the triangularly arranged rotating shafts 12, the coil springs 23,23 of the two clamp cylinders 18,18, and the disc springs 31,…,31 of the grinding wheel holding device 1. The rotating device 2 rotates the turntable 13 relative to the base 11 by the rotation of the rotation motor 16 moving along the outer periphery of the arc rack 15 together with the pinion 17, and rotates the grinding wheel head 5 above it (tilting the grinding wheel head 5, see Fig. 8).

[0026] The forward and backward movement device 3 consists of a forward and backward drive device 36 and a forward and backward moving table 37. The forward and backward drive device 36 includes a pair of linear guides 38,38, a ball screw 39, and a forward and backward drive motor 40. The pair of linear guides 38,38 are fixed to the turntable 13 with their rails 41,41 extending in parallel at intervals from near the arc rack 15 to the rotating shaft 12. The ball screw 39 has its screw shaft 42 arranged in the middle of the rails 41,41 and parallel to them. The bearings at both ends of the screw shaft 42 are fixed to the turntable 13.

[0027] The forward and backward moving table 37 is generally in the shape of a thick plate, placed above the turntable 13, and has blocks 43 of the linear guides 38,38 and a ball nut of the ball screw 39 fixed to its lower surface. A forward and backward drive motor 40 is connected to one end of the screw shaft 42. The forward and backward drive motor 40 is fixed to the turntable 13. The forward and backward drive motor 40 is a servo motor, and its rotation is controlled by a control device (not shown) to move the forward and backward moving table 37 forward or backward in the forward and backward direction (the horizontal direction in Fig. 3).

[0028] The forward and backward movement device 3 changes the distance between the grinding wheel head 5 above the forward and backward moving table 37 and the rotating shaft 12 (see Fig. 9). The lateral movement device 4 includes a pair of linear guides 45, 45, a ball screw 46, and a lateral drive motor 47. The pair of linear guides 45, 45 has their rails 48, 48 extending in parallel at intervals in a direction orthogonal to the linear guide 38 of the forward and backward drive device 36 at a position closer to the rotating shaft 12 from the center between the arc rack 15 and the rotating shaft 12. The rails 48, 48 are fixed to the forward and backward moving table 37.

[0029] The ball screw 46 has its screw shaft 49 arranged in the middle of the rails 48, 48 and parallel to them. The bearings at both ends of the screw shaft 49 are fixed to the forward and backward moving table 37. The blocks 50, 50 of the linear guides 45, 45 and the ball nut of the ball screw 46 are fixed to the base 54 of the grinding wheel head 5. A lateral drive motor 47 is connected to one end of the screw shaft 49. The lateral drive motor 47 is fixed to the forward and backward moving table 37. The lateral drive motor 47 is a servo motor, and its rotation is controlled by a control device (not shown) to move the grinding wheel head 5 in one or the other direction in the lateral direction (the vertical direction in Fig. 3).

[0030] The above-described rotation device 2, forward and backward movement device 3, and lateral movement device 4 operate to move the grinding wheel head 5 described below to an appropriate position with respect to the workpiece. The grinding wheel head 5 includes a base 54, a grinding wheel contact device 55, a grinding wheel pressing device 56, a grinding wheel rotating device 57, and the like. The base 54 is a skeleton (frame, base) that holds the other parts of the grinding wheel head 5.

[0031] The grinding wheel contact device 55 is a device that moves the grinding wheel 61 provided in the grinding wheel head 5 to the surface to be ground of the workpiece W and brings it into contact with the workpiece W. The grinding wheel contact device 55 includes a pair of linear guides 62, 62, a ball screw 63, and a transfer motor 64. The pair of linear guides 62, 62 has their rails 65, 65 extending at intervals in the same direction as the linear guide 38 in the forward and backward movement device 3 and fixed to the base 54. ​

[0032] The ball screw 63 has its screw shaft 66 arranged parallel to and in the middle of the rails 65, 65. The bearings at both ends of the screw shaft 66 are fixed to the base 54. The blocks of the linear guides 62, 62 and the ball nut portion 67 of the ball screw 63 are connected. A transfer motor 64 is connected to one end (the right end in FIG. 7) of the screw shaft 66. The transfer motor 64 is a servo motor, and its rotation is controlled by a control device (not shown).

[0033] On the upper surface of the ball nut portion 67, a guide portion 68 protruding upward is provided. The guide portion 68 has a substantially flat locking surface 69 facing the transfer motor 64 side. The grinding wheel pressing device 56 includes an air cylinder 70, a pair of linear guides 71, 71, etc. The air cylinder 70 is arranged substantially directly above the transfer motor 64, and its protruding rod 72 is aligned with the screw shaft 66 side of the ball screw 63 and integrated with the transfer motor 64. The axial centers of the rod 72 and the screw shaft 66 overlap in a plan view (FIG. 3).

[0034] The linear guides 71, 71 extend parallel to the rod 72 below the rod 72 and are fixed to the base 54. The grinding wheel rotating device 57 includes a frame 74, a grinding wheel rotating motor 75, a grinding wheel holder 76, etc. The grinding wheel rotating motor 75 is fixed to the frame 74 such that its drive shaft overlaps the extension of the axial center of the rod 72 in a plan view (FIG. 3) and is located on the side opposite to the air cylinder 70.

[0035] The grindstone holder 76 is a rotating shaft rotatably held by the frame 74. The axis of the grindstone holder 76 is substantially horizontal and overlaps the extension of the axis of the rod 72 in plan view. The grindstone holder 76 is located near the end on the opposite side of the transfer motor 64 and the air cylinder 70 in the grindstone head 5. The inner end of the grindstone holder 76 (the rotating shaft of the grindstone 61) is connected to the grindstone rotation motor 75 by a pulley and a timing belt. The outer end of the grindstone holder 76 is where the cup-shaped grindstone 61 is detachable.

[0036] A contact member 77 is provided at the end of the frame 74 on the opposite side of the grindstone 61. The contact member 77 is located between the linear guides 71, 71 of the grindstone pressing device 56 in plan view. The contact member 77 moves the grindstone rotation device 57 integrated with the frame 74 toward the rotation shaft 12 side when the rod 72 of the air cylinder 70 extends and is pushed. The contact member 77 faces the grindstone 61 side and has a contact surface 78 that can contact the locking surface 69 of the guide portion 68. When the grindstone head 5 is viewed from the axial direction of the grindstone holder 76 (arrow B in FIG. 7), the contact surface 78 naturally overlaps the locking surface 69 of the guide portion 68 in the ball nut portion of the grindstone contact device 55.

[0037] The frame 74 of the grindstone rotation device 57 is fixed to the blocks 73, 73 of the linear guides 71, 71 in the grindstone pressing device 56. FIG. 11 is a view showing the state of polishing the end face of the tapered roller W with the end face processing device 7 provided with the grindstone holding device 1, and FIG. 12 is a schematic view showing the positional relationship between the grindstone 61 and the end face of the tapered roller W in the portion shown in FIG. 11. (a) of FIG. 12 is a view of FIG. 11 seen from the direction of arrow C, and (b) is a view of FIG. 11 seen from above.

[0038] The end face processing device 7 has a lower roll 81 and an upper roll 82 with the lower roll 81 facing down It is a two-roll one-shoe type polishing apparatus arranged vertically one above the other. The rotation axes of the lower roll 81 and the upper roll 82 are parallel, but the axis of the upper roll 82 is offset to one side of the vertical plane above the vertical plane containing the axis of the lower roll 81 (on the left side in Fig. 12). Both the lower roll 81 and the upper roll 82 are connected to a drive motor and rotate in the same direction.

[0039] The end face processing device 7 sandwiches the tapered roller W between the lower roll 81 and the upper roll 82, and prevents the tapered roller W from falling off to the side where the axis of the upper roll 82 is offset by a shoe 83 located on this offset side. The end face processing device 7 rotates the lower roll 81 to rotate the tapered roller W, tilts the rotation axis of the grinding wheel 61 according to the degree of curvature of the end face of the tapered roller W, and presses it against the end face of the tapered roller W. In this state, the end face processing device 7 polishes the curved end face of the tapered roller W. The backward movement of the tapered roller W due to the pressing of the grinding wheel 61 is prevented by the backing head portion 84.

[0040] The function of the shoe 83 to prevent the tapered roller W from falling off is maintained even when the tapered roller W rotates due to the rotation of the lower roll 81. By the way, in a two-roll one-shoe type polishing apparatus, when polishing, for example, the convexly curved end face of the tapered roller W, as shown in Fig. 12(b), the cup-shaped grinding wheel 61 has its rotation axis inclined with respect to the rotation axis of the tapered roller W, and its (ring-shaped) polishing surface is pressed against the end face of the tapered roller W. At this time, the relative speed between the end face of the rotating tapered roller W and the polishing surface of the grinding wheel 61 is minimized at the center of the end face of the tapered roller W, and polishing is insufficient near the center, resulting in a very slight bulge (hereinafter referred to as "boss").

[0041] The grinding wheel holding device 1 repeats the reciprocating movement of the grinding wheel 61 in the lateral direction (the vertical direction in Fig. 3) during the polishing process or at a predetermined time before the end of the polishing process in order to remove the "boss" generated on the end face of the tapered roller W. The reciprocating movement of the grinding wheel 61 in the lateral direction is controlled by the control device for the lateral movement device 4The grinding surface of the grinding wheel 61 is kept in close contact with the end surface of the tapered roller W by the lateral movement of the grinding wheel 61, by the extension of the rod 72 of the air cylinder 70 in the grinding wheel pressing device 56.

[0042] The rotating device 2 is operated in accordance with the lateral reciprocating movement of the grinding wheel 61, and the inclination of the rotation axis of the grinding wheel 61 relative to the rotation axis of the tapered roller W can be optimized by the rotating device 2 to match the curvature of the curved end face of the tapered roller W, depending on the lateral position of the grinding wheel 61. The grindstone holding device 1 can freely change the degree of inclination of the rotation axis of the grindstone 61 relative to the rotation axis of the workpiece W by using the turning device 2. The grindstone holding device 1 can easily accommodate various workpieces W having different degrees of curvature of the end face by optimizing the degree of inclination of the rotation axis of the grindstone 61.

[0043] The grindstone holding device 1 can freely change the position of the intersection between the rotation axis of the workpiece W and the rotation axis of the grindstone 61, which is inclined relative to the rotation axis of the workpiece W, by using the front-rear moving device 3. This allows the grindstone holding device 1 to easily accommodate various workpieces W of different lengths by optimizing the position of the grindstone 61 in the direction of the rotation axis of the workpiece W. The grindstone holding device 1 can use the lateral movement device 4 to freely change the position of the grindstone 61 in a direction perpendicular to the rotation axis of the workpiece W. The grindstone holding device 1 can easily accommodate various workpieces W having different diameters of the polished surface by optimizing the position of the grindstone 61 in the radial direction.

[0044] Fig. 13 is a diagram for explaining the operation of the grindstone abutting device 55 and the grindstone pressing device 56 in the grindstone head 5. Fig. 13(a) is a diagram showing a state in which the grindstone 61 is separated from the workpiece W before the grinding process. When the control device instructs the end surface processing device 7 to grind the end surface of the workpiece W, Pressurized air is sent to the air cylinder 70 of the pressure device 56. In addition, the transfer motor 64 of the grindstone contact device 55 operates to move the ball nut portion 67 (guide portion 68) toward the grindstone holder 76 at a predetermined speed.

[0045] The contact member 77 pressed by the rod 72 of the air cylinder 70 is restricted in its movement (towards the work W side) by the guide portion 68. Therefore, the moving speed of the grindstone rotating device 57 towards the work W, that is, the moving speed of the grindstone 61 towards the work W, is controlled by the operation of the transfer motor 64. When the grindstone 61 reaches the end face of the work W (Fig. 13(b)), the movement of the grindstone 61 (grindstone rotating device 57) (extension of the rod 72) is blocked by the work W, and only the guide portion 68 advances by a preset distance Dm.

[0046] The grindstone contact device 55 serves to limit the extension of the rod 72 of the grindstone pressing device 56 in order to prevent damage caused by the grindstone 61 hitting the end face of the work W forcefully. In the above-described embodiment, the processing of the work W by the end face processing device 7 provided with the grindstone holding device 1 was defined as "polishing". If the grindstone held by the grindstone holding device 1 is for grinding, the end face processing device 7 can, for example, grind the end face of a flat work W into a curved surface. The end face processing device 7 provided with the grindstone holding device 1 can be applied to both polishing and grinding.

[0047] In addition, each configuration or the overall structure, shape, dimensions, number, material, etc. of the grindstone holding device 1 and the end face processing device 7 can be appropriately changed in accordance with the gist of the present invention.

Industrial Applicability

[0048] The present invention can be used in an end face processing device for grinding or polishing a work end face having a circular cross section.

Explanation of Reference Numerals

[0049] 1 Grindstone holding device 2 Rotating device 3 Forward and backward moving device (second moving device) 4 Lateral moving device (first moving device) 7 End face processing device 11 Base 12 Rotating shaft 13th turntable 14 Locking groove (clamping device) 15 Arc rack 16 Rotating motor 17 Pinion 18 Clamping cylinder (clamping device) 47 Lateral drive motor 57 Grinding wheel rotating device 61 Grinding wheel 76 Grinding wheel holder (rotating shaft) 81 Lower roll (roll) 82 Upper roll (roll) 83 Shoe

Claims

1. A grinding wheel rotating device that holds a cup-shaped grinding wheel and rotates it around a rotating shaft extending horizontally, A rotating table integrated above the grinding wheel rotating device, A base arranged below the rotating table and supporting the rotating table rotatably via a rotating shaft whose axis is vertical, A rotating device equipped with a rotating motor for rotating the rotating table, A first moving device equipped with a lateral drive motor for reciprocally moving the grinding wheel rotating device in a horizontal direction orthogonal to the rotating shaft with respect to the rotating table, and having The rotating device is An arc rack in which a continuous row of horizontally aligned teeth is an arc, A pinion meshing with the arc rack, A rotating motor for rotating the pinion, and having The arc rack is integrated with the base by aligning the center of curvature of the arc with the axis of the rotating shaft, Integrated, The rotating motor is integrated with the rotating table, Both the rotating motor and the lateral drive motor are servo motors, When the grinding wheel rotates, The reciprocating movement of the grinding wheel rotating device by the lateral drive motor is possible, and the rotation of the rotating table by the rotating motor is possible according to the position of the reciprocating movement, Configured to be A grinding wheel holding device characterized by this.

2. It has a plurality of clamping devices that can disable the rotation of the rotating table with respect to the base, The clamping device is provided on the arc rack side rather than at the center between the rotating shaft and the arc rack. The grinding wheel holding device according to Claim 1.

3. Between the rotating table and the grinding wheel rotating device, it is equipped with a second moving device for reciprocally moving the grinding wheel rotating device in the axial direction of the rotating shaft. The grinding wheel holding device according to Claim 1 or Claim 2.

4. An end face processing device for grinding or polishing the end face of a workpiece with a circular cross-section, The grinding wheel holding device according to any one of Claims 1 to 3, A pair of rolls for rotating the workpiece and holding the workpiece substantially above and below it, A shoe that contacts the circumferential surface of the workpiece to prevent the workpiece from falling off, and having The outer end of the grinding wheel is formed so as to be able to contact the end face of the workpiece. An end face processing device.

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