JP2009072871A - Spherical surface property correcting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reform the whole surface properties of spherical bodies 8, 8 by making the spherical bodies 8, 8 abut on correcting faces 17, 18 uniformly over the whole surfaces of the spherical bodies 8, 8. <P>SOLUTION: The lower face of a first correcting plate 14 is a first correcting face 17 as a flat face. The first correcting plate 14 is installed to be displaceable only in the axial direction using a pressure control device. A second correcting plate 15 has a second correcting face 18 flat and parallel to the first correcting face 17, and an annular holding portion 16 provided in a portion encircling the second correcting face 18. On the inner diameter side of the holding portion 16, a holder 21 holding the spherical bodies 8, 8 is assembled in a rotatable manner. In the state where an axis between the center of the holder 16 and a driving shaft 20 is made eccentric, the second correcting plate 15 is driven to be rotated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement of a correction device used to correct the properties of a ball or the like 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. 6A, the spherical wrapping apparatus 1 is provided with an upper lap machine 2 and a lower lap machine 3 each of which is provided in the vertical direction so as to face each other, and the lower lap machine among them. And a drive shaft 4 for rotating 3. 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. 6A} by a pressing force applying device (not shown). Then, in a state where the upper lapping machine 2 is sufficiently moved away from the lower lapping machine 3 {moved above (A) in FIG. 6}, a plurality of spheres 8 and 8 are placed in the annular groove 7 as shown in FIG. As shown in (B) of FIG. Thereafter, the upper lapping machine 2 is moved in a direction approaching the lower lapping machine 3 (downward in FIG. 6A), and the spheres 8 and 8 are sandwiched between the correction surfaces 5 and 6. In this state, 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, 8 is located inside the V-shaped annular groove 7 formed on the correction surface 6 of the lower lapping machine 3 a {right side of FIG. } And the outside b {the left side of FIG. 6A} and the correction surface c of the upper lapping machine 2 are in contact with three points. 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.

  7 to 8 show a second example of the conventional structure. In the case of this example, the spheres 8 and 8 sandwiched between the annular concave grooves provided on the pair of correction surfaces 5a and 6a are rotated about the rotation axis h shown in FIG. A revolving motion is performed on the trajectory j shown in FIG. In the case of the conventional structure shown in FIGS. 7 to 8, the spheres 8 and 8 roll on the same revolution trajectory j, and the phase of the rotation axis h hardly changes. For this reason, both the correction surfaces 5a and 6a and the surfaces of the spheres 8 and 8 are in contact with only a part of the surfaces of the spheres 8 and 8, and adhere to the surfaces of the spheres 8 and 8. The problem that foreign matter cannot be removed occurs.

Further, in order to correct the surfaces of the spheres 8 and 8, it is inevitable that the correction surfaces 5a and 6a are worn. And when each of the correction surfaces 5a, 6a is worn, there is a problem that the action (roundness, foreign matter removal) of correcting the surfaces of the spheres 8, 8 is impaired.
In general, for the purpose of removing foreign matters on the surfaces of the spheres 8 and 8, SUS440C or the like is used for the correction surfaces 5a and 6a. However, the spheres 8 and 8 made of a hard material such as bearing steel are used. Durability and wear resistance are not sufficient. For this reason, it is necessary to exchange these lapping machines 2 and 3 relatively frequently. Since such an operation causes the manufacturing cost of the spheres to be increased, it is desirable to extend the life of the correction surfaces 5a and 6a in order to reduce the cost of the balls 8 and 8. .

  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 in FIGS. 9 to 11), the surfaces of the spheres 8 and 8 are moved to the correction surface 5b and the inclined surfaces 9a. , 9b are contacted 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 shown 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. 11, the outer ring 11 is moved upward in the axial direction (upward in FIGS. 9 to 11) by the pressure member 12, so that the spherical bodies 8 and 8 and the inclined surfaces 9a and 9b are moved. 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. 9 to 11 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 the V-shaped annular groove, which complicates the structure of the device and increases the cost. Further, a mechanism for independently rotating the upper lap machine 2a and the inner and outer rings 10 and 11 of the lower lap machine 3a and a control mechanism for controlling the drive mechanism are required, which is costly. It is inevitable that it will be very bulky.

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.

Preferably, as described in claim 2, there is provided a pressing force adjusting device capable of adjusting the magnitude of the pressing force in the direction in which the first and second correction boards are brought closer to each other.
Preferably, as described in claim 3, at least one of the first and second straightening surfaces is covered with ceramic.

  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.

  Further, if the structure described in claim 2 is adopted, the properties of the surfaces of the spheres can be corrected more quickly and better (improved sphericity and foreign matter removal) for the following reasons. That is, the material of both the first and second correction surfaces, the relative rotational speed, the force with which these correction surfaces hold the spheres, etc. are important factors for correcting the surface properties of the spheres. . Therefore, in order to satisfactorily correct the surface properties of each of these spheres, the first and second correction disks and the surface of each of these spheres are brought into contact with each other with an appropriate force. It is important to appropriately control the amount of generated wear (frictional force). And this control can be performed comparatively easily by adjusting the force which clamps each said spherical body. Therefore, as described in claim 2, if a pressing force adjusting device capable of adjusting the magnitude of the force of pressing both the first and second correction boards in a direction to bring them closer to each other is provided, Surface properties can be corrected earlier and better.

  Furthermore, according to the structure described in claim 3, it is possible to extend the life of both the first and second straightening panels. Both the first and second correction discs rub against the surface of each sphere repeatedly and for a long time to correct the surface properties of each sphere (improving sphericity and removing foreign matter). Both the correction surfaces deteriorate due to wear, deformation, or the like. Therefore, as described in claim 3, by covering the surface of at least one of the two correction surfaces with ceramic, the deterioration of the correction surface can be suppressed, and a long life can be realized. In addition, suppressing the deterioration of the correction surface leads to a good sphericity of each sphere.

[First example of embodiment]
FIG. 1 shows a first example of an embodiment of the present invention corresponding to claims 1 and 2. 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. 1B) via a pressing shaft 19 by a pressing force adjusting device (not shown) such as an air cylinder, It is installed so that it can be lifted. 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, on the basis of the eccentricity of α, the trajectory of the rolling surface of each of the spheres 8 and 8 becomes 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, if the amount of eccentricity α is 1/3 of the entire circumference of the diameter of each sphere 8, 8 (πD / 3 when the diameter of each sphere is D), The trajectory trajectory of the rolling surface becomes a wide trajectory trajectory p as shown in FIG. 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.
Further, by setting the amount of eccentricity α to ½ (πD / 2) of the entire circumference of each sphere 8, 8, the trajectory r of each sphere 8, 8, as shown in FIG. Compared with the trajectory locus p shown in FIG. Then, the change of the rotation axis of each of the spheres 8 and 8 is made larger than that in the case of FIG. 2 to remove foreign matters over the entire surface of each sphere 8 and 8 in a shorter time, It is possible to improve the sphericity.

  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 14 or both straightening plates 14 and 15 together. The material is appropriately selected according to the material of No. 8.

[Second Example of Embodiment]
FIG. 4 shows a second example of an embodiment of the present invention corresponding to claims 1 and 2. In the case of this example, the pockets 22 and 22 are provided in the retainer 21a in double rows (two concentric circles) in the radial direction, thereby increasing the number of the spheres 8 and 8 that can be held in the retainer 21a. Yes. Then, the surface properties of a large number of spheres 8 and 8 can be efficiently corrected by a single operation. In addition, in order to be able to correct the surface properties of more spheres 8 and 8 at the same time, as shown in FIG. 5, more rows of pockets 22 and 22 (3 rows concentrically) of the cage 21b are provided. Is also possible. Since the configuration and operation of the other parts are the same as those of the structure shown in the first example, illustration and description regarding the equivalent parts are omitted.

[Third example of embodiment]
When practicing the present invention, preferably, each of the straightening surfaces 17 and 18 of the first and second straightening plates 14 and 15 is made of silicon nitride (Si ₃ N ₄ ), alumina (Al ₂ O ₃ ), zirconia (ZrO). ₂ ) Made of ceramic. Such ceramic straightening surfaces 17 and 18 improve the durability and wear resistance of the first and second straightening surfaces 17 and 18 as compared to the conventionally used materials such as SUS440C. It is possible to make it. That is, by reducing the deterioration caused by the spheres 8 and 8 on the correction surfaces 17 and 18, the sphericity of the spheres 8 and 8 can be maintained with high accuracy. 14 and 15 can be extended in life.

BRIEF DESCRIPTION OF THE DRAWINGS The 1st example of embodiment of the spherical surface property correction apparatus of this invention is shown, (B) is a side view, (A) is a XX sectional view which abbreviate | omitted the holding | maintenance part. Figure added to. The schematic diagram equivalent to FIG. 1A of Example 1 which shows the revolution track | orbit of each spherical body when the eccentricity quantity (alpha) is set to (pi) D / 3, except the holder | retainer. The same figure as FIG. 2 in the case where the amount of eccentricity α is also πD / 2. The figure similar to (A) of Drawing 1 showing the 2nd example of an embodiment of the invention in the state where a revolution track was removed. The figure similar to FIG. 4 which shows another embodiment. The 1st example of the conventional structure is shown, (A) is a partially cut side view, (B) is the figure which took out the spherical body and the lower lapping machine, and was seen from the top. The schematic diagram showing both the 1st, 2nd correction surface and the rotation axis of a sphere which show the 2nd example of conventional structure. Similarly, the schematic diagram showing a revolution track. Schematic showing the 3rd example of conventional structure. The Y section enlarged view of FIG. The figure equivalent to the left part of Drawing 9 showing the 3rd example of conventional structure in the state where the outer ring position was moved.

Explanation of symbols

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 Pressure 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 (3)

  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. In the state where the retainer is mounted on the straightening plate, the center of the retainer and the drive of the rotary drive device are decentered with respect to the second rotational center axis by the rotary drive device. A device for correcting the surface of a sphere with the center of the shaft offset from each other.   The sphere surface property correcting device according to claim 1, further comprising a pressing force adjusting device capable of adjusting a magnitude of a force of pressing both the first and second correction disks toward each other.   The sphere surface property correcting apparatus according to claim 1, wherein a surface of at least one of the first and second correction surfaces is covered with ceramic.

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