JP2013248678A - Apparatus for correcting spherical surface property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct the property of the whole surfaces of spherical bodies by bringing the spherical bodies into contact with correction surfaces uniformly over the whole surfaces of the spherical bodies.SOLUTION: The lower face of a first correction plate provided with a lube oil flow passage serves as a first flat correction surface. The first correction face is covered with a soft material such as nonwoven fabric. A second correction plate includes a second flat correction surface parallel to the first correction surface, and a circular ring-like holding portion provided in a portion surrounding the second correction face. A holder holding each spherical body is rotatably assembled on the inner radius side of the holding portion. A lube oil outlet is provided between the holding portion and the second correction plate. The second correction plate is rotated with a center of the holder and the axis core of a drive shaft eccentric.

Description

  The present invention relates to an improvement of a correction device used for correcting the properties of a sphere such as a rolling element used for a ball bearing, a linear guide, or the like. Specifically, it is possible to realize a correction device capable of efficiently forming a highly accurate true sphere and efficiently removing foreign matters and the like attached to the surface of the sphere.

  As a device for improving the surface properties (sphericity, foreign matter removal) of a sphere, a sphere wrapping device as described in Non-Patent Document 1 is conventionally known. As shown in FIG. 4, this spherical wrapping apparatus 1 is provided so as to be opposed to each other in the vertical direction, and each of the upper lapping machine 2 and the lower lapping machine 3 each having a disk shape, and the lower lapping machine 3 are rotated. Drive shaft 4 for the purpose. Among these, the lower surface of the upper lapping machine 2 is a correction surface 5 which is a flat surface, and the upper surface of the lower lapping machine 3 is a correction surface 6 in which a V-shaped annular groove 7 is formed. The lower lapping machine 3 is fixed concentrically with the drive shaft 4, and the drive shaft 4 is rotatable by a rotary drive device (not shown).

  The upper lapping machine 2 can be moved only in the axial direction (vertical direction in FIG. 4) by a pressing force applying device (not shown). Then, with the upper lapping machine 2 sufficiently away from the lower lapping machine 3 (moved upward in FIG. 4), a plurality of spheres 8, 8 are annularly formed in the annular groove 7 as shown in FIG. To place. Thereafter, the upper lapping machine 2 is moved in a direction approaching the lower lapping machine 3 (downward in FIG. 4), and the spheres 8 and 8 are sandwiched between the correction surfaces 5 and 6 in the state described above. The lower lapping machine 3 is rotated by the drive shaft 4. As a result, the spheres 8 and 8 rotate and revolve between the correction surfaces 5 and 6 while rolling and sliding with the correction surfaces 5 and 6. The surface properties (sphericity, foreign matter removal) are corrected.

  In the mechanism as described above, each of the spheres 8 and 8 has an inner side a (the right side in FIG. 4) of the V-shaped annular groove 7 formed on the correction surface 6 of the lower lapping machine 3 and an outer side b. (The left side of FIG. 4) and three points of the correction surface c of the upper lapping machine 2 are in contact. For this reason, due to the difference in the peripheral speed due to the difference in diameter between the inner side a and the outer side b of the V-shaped annular groove 7 and the correction surface 4c, each of the spheres 8 and 8 performs the sliding motion based on the rotation, Revolve. Then, the position of the surface to be polished is sequentially changed by the change of the rotation axis. However, in the method of changing the rotation axis of each of the spheres 8 and 8 by the difference in diameter between the inner and outer sides a and b of the annular groove 7, the amount of change of the rotation axis is not sufficient. In order to bring the entire surface into contact with the correction surfaces 5 and 6 of the both lapping machines 2 and 3, it is necessary to considerably increase the operation time.

  In view of the circumstances as described above, Patent Document 1 describes a spherical wrapping apparatus 1a as shown in FIGS. The spherical wrapping apparatus 1a includes a pair of lapping machines, an upper lapping machine 2a and a lower lapping machine 3a, which are provided facing each other in the vertical direction, and a drive shaft 4a for rotating the upper and lower lapping machines 2a and 3a. 4b. Among these, the lower surface of the upper lapping machine 2a is a correction surface 5b which is a flat surface. The lower lapping machine 3a includes an inner ring 10 and an outer ring 11. Out of these, the outer ring 11 is movable in the axial direction via the pressure members 12 and 12 by a pressure mechanism (not shown). Further, the inner ring 10 and the outer ring 11 are provided with inclined surfaces 9a and 9b formed so as to be separated from each other in the radial direction as they approach the upper lapping machine 2a. By these 9a and 9b, a V-shaped annular recess is formed. A groove is formed.

  When adjusting the surface properties of the spheres 8, 8, the spheres 8, 8 are arranged in the V-shaped annular grooves. Thereafter, by moving the upper lapping machine 2a in a direction approaching the lower lapping machine 3a (downward direction from FIG. 6 to FIG. 8), the surfaces of the spheres 8 and 8 are changed to the correction surface 5b and the both inclined surfaces. 9a and 9b are brought into contact at three points d, e, and f, respectively. With the spheres 8 and 8 held between the contact points d, e, and f, both the lapping machines 2a and 3a are rotated in opposite directions as indicated by arrows in FIGS. In this way, the spheres 8 and 8 are in contact with the surfaces 5b, 9a and 9b in rolling contact and sliding contact in a state commensurate with the clamping force and the rotational speeds of both the lapping machines 2a and 3a. While rotating and revolving, the surface properties (sphericity, foreign matter removal) are adjusted.

The upper lapping machine 2a, the inner ring 10 of the lower lapping machine 3a, and the outer ring 11 have a structure that can be independently driven by a rotation driving mechanism (not shown). Then, by appropriately controlling the rotation of each, the phase of the rotation axis g of each of the spheres 8 and 8 is positively changed. In other words, the entire surface of each sphere 8, 8 is brought into contact with the correction surface 5 b and the inclined surfaces 9 a, 9 b, thereby correcting the properties of the entire surface (sphericity, foreign matter removal).
Further, as shown in FIG. 8, by moving the outer ring 11 axially upward (upward from FIG. 6 to FIG. 8) by the pressure member 12, the spheres 8, 8 and the inclined surfaces 9a, The contact point with 9b is moved from e, f to e ', f'. And the surface of each said spherical body 8 and 8 is made to contact the wide range of both said inclined surface 9a, 9b, and lifetime improvement of the said upper and lower lapping machines 2a and 3a is aimed at.

  However, in the structure as shown in FIGS. 6 to 8 described above, the lower lapping machine 3 a must be divided into the inner ring 10 and the outer ring 11. In addition, the inclined surfaces 9a and 9b of the inner and outer rings 10 and 11 must be processed in order to form a V-shaped annular groove, which complicates and refines the structure of the apparatus. Further, a mechanism for independently rotating the upper lap machine 2a and the inner and outer rings 10, 11 of the lower lap machine 3a and a control mechanism for controlling the drive mechanism are required. It is inevitable that this will increase costs.

  In addition, when a metal material such as stainless steel is used for the straightening board material, non-metallic inclusions in the material may be exposed on the surface, thereby possibly damaging the sphere. Therefore, it is conceivable to replace the straightening board material with a ceramic material, etc., but ceramic is less likely to damage the sphere, but if the hardness is much higher than the sphere, it will push in the foreign matter that has adhered to the sphere. There was a risk that foreign matter would be firmly fixed to the sphere. Furthermore, even when foreign matter is removed from the surface of the sphere, there is a concern that the removed foreign matter may stay in the vicinity of the sphere traveling portion and adhere to the sphere again.

Japanese Patent No. 3108457 Masataka Igarashi, “Easy-to-Understand Machine Course / Precision Finishing and Special Processing”, Meikosha Co., Ltd., July 10, 1977, p. 80-81

  In view of the circumstances as described above, the present invention can be configured relatively easily and can sufficiently change the phase and revolution trajectory of each sphere, and can efficiently correct the properties of the entire surface of each sphere. The invention was invented to realize a spherical surface property correcting device that can be performed.

  The spherical surface property correcting device of the present invention includes a first correcting plate, a second correcting plate, a rotation driving device that rotationally drives the second correcting plate, and an annular holding portion. Both of these first and second straightening plates are provided with first and second straightening surfaces that are flat and parallel to each other. The annular holding portion is provided in a portion of the second straightening plate surrounding the second straightening surface. An annular cage holding a plurality of spheres in a pocket is rotatably held on the inner diameter side of the holding portion. In this state, the spheres are sandwiched between the first and second correction surfaces. The rotational drive device rotationally drives the second correction board.

  Then, by rotating and driving the second straightening plate by the rotational driving device, the rolling surfaces of the spheres are brought into rolling contact and sliding contact with both the first and second straightening surfaces. Improves rolling surface properties (improves sphericity, removes foreign matter). Further, in a state where the retainer is mounted on the second straightening panel, the center of the retainer and the center of the retainer are decentered with respect to the second rotation center axis of the rotational drive device. The center of the drive shaft of the rotary drive device is eccentric from each other. However, the center of the drive shaft and the centers of the first and second correction disks are parallel or concentric. Moreover, at least one of the first correction surface and the second correction surface is covered with a nonwoven fabric, and lubricating oil is supplied to the periphery where the spheres are arranged.

  Since the spherical surface property correcting device of the present invention as described above has the rotation center axis of the second correction disk and the rotation center axis of the cage being eccentric from each other, each sphere rotates while rotating in the pocket, A relatively complex movement is made to revolve around the center of the first correction surface while revolving around the center of the cage. With this movement, the rotation axis of each sphere also changes as needed. For this reason, the surface of each of these spheres contacts the first and second correction surfaces over the entire surface relatively early. As a result, the properties of the entire surface of each sphere can be corrected efficiently.

  Furthermore, by covering at least one of the first correction surface and the second correction surface with a non-woven fabric, spherical damage caused by non-metallic inclusions when using metal for the correction plate, and ceramic for the correction plate were used. In this case, it is possible to prevent foreign matter from being pushed into the surface of the sphere. In addition, by supplying lubricating oil to the periphery of the sphere, foreign matter can be quickly discharged out of the system, and reattachment of the foreign matter to the sphere can be prevented.

It is the side view which showed embodiment of the spherical surface property correction apparatus of this invention. It is the schematic diagram which drew the revolution track | orbit with respect to the 1st correction surface of a sphere. It is the schematic diagram which drew the revolution track | orbit with respect to the 1st correction surface of each spherical body when the eccentric amount (alpha) was set to (pi) D / 3. It is a partial cutting side view in the spherical surface property correction apparatus of the conventional structure. It is the figure which took out the sphere of FIG. 4 and a lower lapping machine, and was seen from the top. Schematic showing another conventional structure. The Y section enlarged view of FIG. The figure equivalent to the left part of FIG. 6 showing the state which moved the outer ring | wheel position.

  FIG. 1 shows an embodiment of the present invention. The feature of this example is that the sphere surface property correcting device 13 is composed of first and second correction disks (lapping machines) 14 and 15, and each of the spheres 8 between these correction disks 14 and 15; By devising the shape and structure of the holding portion 16 for holding the holder 21 holding the rotary 8 rotatably, the drive shaft 20 for rotating the second straightening plate 15 and the like, , 8 is to improve the performance for adjusting the surface properties (improving sphericity, removing foreign matter). Since the configuration and operation of the other parts are the same as those of the conventional structure shown in FIG. 6, the illustration and description of the equivalent parts are omitted or simplified, and the following description will focus on the characteristic parts of this example.

  The lower surface of the first correction board 14 is a first correction surface (wrap surface) 17 that is a flat surface (horizontal surface). The first straightening panel 14 can be pressed in the axial direction (vertical direction in FIG. 1) via a pressing shaft 19 and can be moved up and down by a pressing force adjusting device (not shown) such as an air cylinder. doing. The pressing shaft 19 is provided concentrically with the first correction board 14 in the vertical direction.

  The upper surface of the second straightening board 15 is a second straightening surface (wrap surface) 18 that is a flat surface (horizontal surface) parallel to the first straightening surface 17. An annular holding portion 16 is provided on the upper surface of the second straightening board 15 at a portion surrounding the second straightening surface 18. The second correction board 15 can be driven to rotate by the rotation shaft (not shown) such as an electric motor via the drive shaft 20 arranged in the vertical direction. The axis of the drive shaft 20 and the center of the holding portion 16 are parallel to each other and are eccentric by α.

  Further, an annular retainer 21 is rotatably fitted (with a gap fit) in a portion surrounded by the holding portion 16 and the second correction surface 18 so as to surround the periphery and the bottom. And the spherical bodies 8 and 8 are hold | maintained so that rolling is possible in the some pockets 22 and 22 provided in this holder | retainer 21, respectively. The spheres 8 and 8 are sandwiched between the first and second correction surfaces 17 and 18. When adjusting the surface properties of the spheres 8 and 8, the spheres 8 and 8 are thus sandwiched between the correction surfaces 17 and 18 by the rotary drive device. The second correction board 15 is driven to rotate. Then, the surfaces (rolling surfaces) of the spheres 8 and 8 are brought into rolling contact and sliding contact with the first and second correction surfaces 17 and 18, respectively, and their properties (improved sphericity, foreign matter removal). To arrange. At this time, each of the spheres 8 and 8 slides between the two correction surfaces 17 and 18 while actively changing the rotation axis and the revolution trajectory with the rotation of the second correction board 15. Roll while.

  That is, based on the eccentricity of α, the trajectory of the rolling surface of each of the spheres 8 and 8 is like the revolution trajectory n shown in FIG. Then, the rotation axis of each of the spheres 8 and 8 appropriately changes according to the amount of eccentricity α as the revolution orbit n changes. That is, the rolling surfaces of the spheres 8 and 8 and the first and second correction surfaces 17 and 18 roll over the entire surface of the spheres 8 and 8 according to the eccentricity α. Contact and sliding contact. As a result, the surface of each of the spheres 8 and 8 can achieve a highly accurate sphericity and can remove foreign matter over the entire surface.

  Specifically, for example, if the amount of eccentricity α is 1/3 of the entire circumference of the diameters of the spheres 8 and 8 (πD / 3 when the diameter of each sphere is D), As shown in FIG. 3, the trajectory trajectory of the rolling surface is a wide trajectory trajectory p. In this way, the rotation axis of each of the spheres 8 and 8 changes with the trajectory trajectory p of both the first and second correction surfaces 17 and 18. As a result, the foreign matter can be removed and the sphericity can be improved over the entire surface of each of the spheres 8 and 8.

  In the case of operating the spherical surface property correcting device according to this example, polishing is performed to remove the sphericity of each of the spheres 8 and 8 and the foreign matter on the surface. The amount of polishing in this case is the rotational speed of the drive shaft 20, the magnitude of the force with which the first and second correction surfaces 17, 18 press the spheres 8, 8, and the spheres 8, 8 And it changes with the material etc. of both the correction surfaces 17 and 18. FIG. Therefore, in order to make the polishing amount appropriate, in this example, as described above, a variable speed rotation driving device and a pressure adjusting mechanism capable of adjusting the pressing force are provided. Therefore, the amount of polishing is adjusted by appropriately adjusting one or both of the rotational speed and the pressing force in accordance with the spheres 8 and 8 that are the workpieces.

In the above description, the spherical surface property correcting device of this example has been described for the case where the sphericity of each of the spheres 8 and 8 and the removal of foreign matter are simultaneously performed. However, when carrying out the present invention, it is also possible to obtain the effect of only one of these sphericity and foreign matter removal.
Furthermore, in the structure of this example, only the second straightening plate 15 is rotated. However, when the present invention is carried out, both the first and second straightening plates 14 and 15 are placed in opposite directions or the same. You may rotate in the direction at mutually different speeds. Of these first and second straightening plates 14 and 15, it is free to rotate the second straightening plate 15 or to rotate both straightening plates 14 and 15 together. The material is appropriately selected according to the material of No. 8.

  Furthermore, a flexible member such as the nonwoven fabric 43 is provided so as to cover the correction surface 17 of the first correction board 14. If such a correction surface 17 is used, it is possible to prevent damage to the sphere due to non-metallic inclusions when metal is used for the correction plate, and to prevent foreign matter from being pushed into the surface of the sphere when ceramic is used for the correction plate. it can.

  In addition, a lubricating oil introduction path 41 is provided in the first straightening board 14, and the lubricating oil is introduced from the outside and is constantly supplied to the cage 21 and the sphere 8 and the periphery thereof. The supplied lubricating oil is discharged from a discharge port 42 provided between the second straightening board 15 and the holding unit 16. As a result, the foreign matter is quickly discharged out of the system together with the lubricating oil, and the reattachment of the foreign matter to the sphere 8 is prevented.

DESCRIPTION OF SYMBOLS 1, 1a Spherical wrapping device 2, 2a Upper lapping machine 3, 3a Lower lapping machine 4, 4a, 4b Drive shaft 5, 5a, 5b Correction surface 6, 6a Correction surface 7 Annular groove 8 Sphere 9a, 9b Inclined surface 10 Inner ring DESCRIPTION OF SYMBOLS 11 Outer ring 12 Pressurization member 13 Spherical surface property correction apparatus 14 1st correction board 15 2nd correction board 16 Holding part 17 1st correction surface 18 2nd correction surface 19 Press shaft 20 Drive shaft 21, 21a, 21b Cage 22 pocket

Claims (1)

  A first straightening plate having a first straightening surface which is a flat surface, a second straightening plate having a second straightening surface which is a flat surface parallel to the first straightening surface, and the second straightening plate The second correction surface of the second correction plate and the rotation driving device that rotates the second correction plate while keeping the correction surface of the first correction surface and the first correction surface parallel to each other A plurality of spheres held in pockets of an annular retainer rotatably held on the inner diameter side of the retainer. In a state of being sandwiched between the two correction surfaces, the second correction disk is rotated by the rotation driving device, so that the rolling surfaces of the spheres are made to be the first and second correction surfaces. A spherical surface property correcting device for adjusting the properties of the rolling surface of each sphere by rolling contact and sliding contact with The straightening plate is provided with a lubricating oil supply passage for supplying lubricating oil to the cage, and the second straightening plate is provided with a lubricating oil discharge port for discharging the lubricating oil supplied to the cage, At least one of the first straightening surface and the second straightening surface is covered with a nonwoven fabric, and the central axis of the cage is rotationally driven in a state where the cage is mounted on the second straightening plate. A sphere surface property correcting device in which the center of the holding portion and the center of the drive shaft of the rotary drive device are eccentric with respect to the second rotation center axis by the device.