JP2012206201A - Truing method and truing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a truing method by which the outer peripheral part of a grinding wheel is formed by effectively utilizing the polishing action of an abrasive grain separated from a truer and by using a simple apparatus that does not require to change the direction of the rotary shaft of the grinding wheel.SOLUTION: When a support 9 for supporting the grinding wheel 6 moves in a direction along each of three axes, namely, an X axis, a Y axis, and a Z axis, the axial center 71 of a rotary shaft 7 always directs toward the Y axis direction. When the outer peripheral part 8 of the grinding wheel 6 is formed by the grinding surface 2 of a truer 1 formed into a conical surface, a positional relationship between the truer 1 and the grinding wheel 6 is maintained in such a manner that a normal at a point P1 on a generating line 5 forming the grinding surface 2 and a normal at a point P21 on the outer peripheral part 8 direct toward the same direction. In other words, a contact part where the point P1 is in contact with the point P21 moves along the generating line 5.

Description

  The present invention relates to truing of a grindstone, and more particularly to a truing method and a truing device for forming a shape of a grindstone used for grinding a high-precision optical element such as a lens, a prism, or a concave reflecting mirror.

  In recent years, high-precision optical elements such as concave reflecting mirrors have been formed only by grinding. The grindstone used in this grinding process has a disk shape, and the cross-sectional shape of the outer peripheral portion thereof is often an arc shape. And in order to shape | mold the shape of the outer peripheral part of this grindstone, the truer of various shapes is used.

  One such truer is called an orthogonal truer. This orthogonal truer is arranged so that its rotational axis is orthogonal to the rotational axis of the grindstone in plan view. Then, the cross-sectional shape is formed into a predetermined shape while moving the rotation axis of the orthogonal truer along the cross-sectional shape of the outer peripheral portion of the grindstone. Various truers other than orthogonal truers are also disclosed.

  Patent Document 1 discloses an abacus spherical truer having a conical surface. In paragraph [0033] and FIG. 6 of this publication, a method is disclosed in which a grindstone and a truer are relatively moved by a program with a desired radius of curvature to form a desired curvature shape on the edge of the grindstone. .

  Patent Document 2 discloses a technique for forming an outer peripheral portion of a grindstone using a disk-shaped flat-type truer. In order to form the outer periphery of the grindstone, the direction of the rotation axis of the grindstone is changed.

JP 2005-177946 A JP 2006-218554 A

  In the case of the prior art orthogonal truer, it is not necessary to change the direction of the rotation axis, so that the apparatus is relatively simple. However, the abrasive grains released from the orthogonal truer during the formation of the grindstone are unlikely to stay on the surface of the orthogonal truer and easily fall off from the orthogonal truer. Therefore, the polishing effect on the molding surface of the grindstone by the free abrasive grains is small, and it is difficult to omit the dressing of the grindstone as a subsequent process.

  According to the method of Patent Document 1, since the edge portion of the grindstone is ground with the sharp corners of the abacus spherical truer, the loose abrasive grains are easily dropped as in the case of the orthogonal truer, and the polishing effect is small. For this reason, in order to obtain the polishing effect by the free abrasive grains, it is conceivable to grind the grindstone at the conical surface portion of the truer so that the free abrasive grains easily stay on the surface of the truer. However, in this grinding method, it is necessary to change the directing direction of the rotation axis of the grindstone in order to form a desired curvature shape at the edge portion of the grindstone. Therefore, the device of Patent Document 1 must have a complicated structure as compared with the orthogonal truer device.

  In the method disclosed in Patent Document 2, since the true surface is a vertical surface, loose abrasive grains easily fall off the true surface. For this reason, for example, as shown in FIG. 9, if the surface 22 of the truer 21 is a horizontal plane, the free abrasive grains are likely to stay. Therefore, the polishing effect of the free abrasive grains is greater than that of the method of Patent Document 1. It seems to be. However, as in the case of Patent Document 1, since the directing direction of the rotating shaft 24 of the grindstone 23 has to be changed, the structure of the apparatus according to Patent Document 2 cannot be avoided.

  The present invention has been made paying attention to such problems, and the object of the present invention is to efficiently use the polishing action of abrasive grains released from the truer and to change the direction of the rotation axis of the grindstone. An object of the present invention is to provide a truing method capable of forming the outer peripheral portion of a grindstone with a simple device that does not need to be made.

  In order to solve the above problem, the truing method according to the first aspect of the present invention is directed to a truing method having a grinding surface formed on a conical surface and configured to rotate around a first axis. When forming a grindstone that is rotatably supported by a rotating shaft that is oriented in a second axis direction that is perpendicular to one axis, the outer periphery of the rotating grindstone is brought into contact with the grind surface of the rotating truer. However, the outer peripheral portion is ground by moving the contact portion where the outer peripheral portion and the abrasive surface are in contact with each other along the generatrices of the conical surface forming the abrasive surface.

  According to the above configuration, the grindstone is moved while the rotation axis of the grindstone is fixed in the second axis direction. Further, the contact portion is moved along the generatrix forming the conical surface while bringing the outer peripheral portion of the rotating grindstone into contact with the grinding surface formed on the conical surface of the rotating truer at a predetermined cutting amount. I did it. Then, the movement along this bus is performed on a plurality of buses. For this reason, while using the grinding | polishing effect | action of a loose abrasive grain efficiently, the outer peripheral part of a grindstone can be shape | molded.

  According to a second aspect of the present invention, in the truing method according to the first aspect, when the contact portion is moved along a plurality of generatrixes of the conical surface, the contact portion is reciprocated along one generatrix. Then, the grindstone is moved to a position where the contact portion can move along the adjacent busbar adjacent to the busbar, and the contact portion is moved back and forth along the adjacent busbar in the same manner as the reciprocating movement. By repeating the movement of the grindstone and the reciprocating movement along the generatrix of the conical surface of the contact portion, the cross-sectional shape of the outer peripheral portion of the grindstone is formed into an arc shape.

  According to a third aspect of the present invention, in the truing method according to the first aspect, the movement of the grindstone in a direction along a plurality of generatrixes of the conical surface of the contact portion includes a center of the truer. The contact part is reciprocated along two buses in a symmetric position with respect to a plane orthogonal to the axis, and as a forward movement, the contact part is moved along one bus bar at the symmetric position. After moving in the upward direction, the contact portion is moved in the downward direction along the other bus at the symmetrical position, and then the contact portion is moved in the upward direction along the other bus as a backward movement. Then, the outer peripheral portion of the grindstone is moved by moving the contact portion in the downward direction along the one bus bar and repeating these reciprocating movements on two bus bars in symmetrical positions at different positions. The cross-sectional shape of It is characterized in that the molding arcuately.

  According to a fourth aspect of the present invention, in the truing method according to the first aspect, the movement of the grindstone in a direction along a plurality of generatrixes of the conical surface of the contact portion includes a center of the truer, and The contact part is reciprocated along two buses located symmetrically with respect to a plane parallel to the first axis and the second axis, and is moved forward as one of the buses at the symmetrical position. The contact portion is moved in the upward direction along the other bus line at the symmetrical position, and then moved along the other adjacent bus line adjacent to the other bus line. Then, after moving the grindstone to a position where the contact portion can move, as a backward movement, after moving the contact portion along the other adjacent busbar in the upward direction, one adjacent to the one busbar Said contact portion along the adjacent bus The cross-sectional shape of the outer peripheral portion of the grindstone is formed into an arc shape by moving in the descending direction and repeating these reciprocating movements with respect to two bus bars in symmetrical positions at different positions. Is.

  According to a fifth aspect of the present invention, in the truing method according to any one of the first to fourth aspects, the outer peripheral portion of the grindstone is formed by abrasive grains that are separated from the truer and stay on the abrasive surface. And polishing to eliminate dressing for the grindstone.

  The invention of a truing device according to claim 6 is a truing device used in the truing method according to any one of claims 1 to 5, wherein the abrasive is formed on a conical surface whose apex is directed upward. A truer that has a surface and is rotatably arranged around the first axis, and a rotary axis that is oriented in a second axis direction perpendicular to the first axis and that can support the grindstone, When forming the grindstone, the contact portion where the outer peripheral portion of the grindstone and the abrasive surface formed on the conical surface are in contact with each other is moved along the generatrix of the conical surface, and the cross-sectional shape of the outer peripheral portion is formed into an arc shape. In order to achieve this, the support portion that supports the rotating shaft moves in a direction along each of the first axis, the second axis, and the third axis that is perpendicular to both axes. is there.

  According to the above configuration, the truer having a conical surface formed on the conical surface is disposed so that the apex of the conical surface is directed upward. It has become. For this reason, the polishing effect by the loose abrasive can be enhanced. In addition, while the rotation axis of the grindstone is always oriented in the second axis direction, the support portion that rotatably supports the rotation axis is provided for each of the first axis, the second axis, and the third axis that is perpendicular to both axes. It is possible to move along. For this reason, this truing apparatus simply moves the contact portion where the outer peripheral portion of the grindstone and the grinding surface formed on the conical surface of the truer contact with each other along the generatrix of the conical surface. It is possible to provide a simple device that can form the cross-sectional shape of the outer peripheral portion of the grindstone into an arc shape without changing the axial direction.

  According to the present invention, since free abrasive grains can be retained on the conical surface of the truer, the polishing action of the abrasive grains released from the truer can be used efficiently and the direction of the rotating shaft of the grindstone can be fixed easily. It is possible to provide a truing method capable of forming the outer peripheral portion of the grindstone with a simple apparatus.

The top view which shows the truing apparatus of 1st Embodiment. The AA arrow line view in FIG. The top view which shows the aspect by which one side of an outer peripheral part is shape | molded when a grindstone moves along a bus-line. The side view which shows the same aspect. The top view which shows the aspect by which the other side of an outer peripheral part is shape | molded when a grindstone moves along a bus-line. The side view which shows the same aspect. The top view which shows the truing method of 2nd Embodiment. The top view which shows the truing method of 3rd Embodiment. The top view which shows the truing apparatus of a prior art.

(First embodiment)
Hereinafter, a truing apparatus and a truing method according to a first embodiment embodying the present invention will be described with reference to FIGS. 1 to 6, the first axis, the second axis, and the third axis are shown as a Z axis, a Y axis, and an X axis, respectively.

  As shown in FIGS. 1 and 2, in the truing device of the present embodiment, the truer 1 is supported by a shaft body 4, and the shaft body 4 is rotatably supported by a base (not shown). The truer 1 is arranged such that the grinding surface 2 is formed into a conical surface, and the apex 3 that is the intersection of the bus bar 5 forming the conical surface and the axis 11 of the truer 1 is directed upward.

  Further, the grindstone 6 is attached to a rotating shaft 7 that is rotatably supported by the support portion 9. The support portion 9 is installed on a base (not shown) so as to be movable in directions along the three axes of the X axis, the Y axis, and the Z axis. The movement of the support 9 is controlled by computer numerical control. And when the support part 9 moves to the direction along each of 3 axes, the axial center 71 of the rotating shaft 7 always points in the Y-axis direction.

  Further, when the outer peripheral portion 8 of the grindstone 6 is formed by the truer 1, the respective directions of the normal H1 at the point P1 on the bus 5 that forms the grinding surface 2 and the normal H6 at the point P21 on the outer peripheral portion 8. The positional relationship between the truer 1 and the grindstone 6 is maintained so that they are the same. In other words, the contact portion where the point P1 and the point P21 are in contact with each other is moved along the bus 5 with the movement of the support portion 9 by a predetermined cutting amount. In this case, since the direction of the axis 71 of the grindstone 6 is oriented in the Y-axis direction, the grindstone 6 moves in an oblique posture along the bus bar 5. In addition, the point P21 of this embodiment is located on the outer peripheral part 8 below the grindstone 6 as shown in FIG.

Next, the truing method of this embodiment is demonstrated using FIGS.
In the present embodiment, the grindstone 6 moves along the bus bar 5 so as to reciprocate with respect to one bus bar 5. Then, after the one reciprocation, the grindstone 6 is moved to a position at which the grindstone 6 can move along the adjacent bus bar 51 at a predetermined interval.

  3 and 4, the grindstone 61 indicates the grindstone 6 in which the point P21 on the outer peripheral portion 8 corresponding to the point P1 on the bus 5 on the grinding surface 2 of the truer 1 is located below the extension of the bus 5. . During truing of the grindstone 6, the truer 1 and the grindstone 6 are rotating. The rotation direction of the grindstone 6 of this embodiment is clockwise when viewed in the Y-axis direction. Then, as the forward movement, the grindstone 6 moves in the upward direction along the bus bar 5, and the grindstone 6 in which the contact portion P <b> 2 is generated when the point P <b> 1 and the point P <b> 21 come into contact with each other with a predetermined cut amount is defined as the grindstone 62 It is shown. While the contact portion P <b> 2 moves on the grinding surface 2 along the bus 5, the outer peripheral portion 8 of the grindstone 6 is ground by the grinding surface 2. In this grinding, the abrasive grains released from the truer 1 are likely to stay on the conical abrasive surface 2, so that the outer peripheral portion 8 of the grindstone 6 is polished simultaneously with the grinding by the abrasive grains. And in the grindstone 63 which moved upwards on the extended line of the bus-line 5, the contact state of the point P1 and the point P21 is solved.

  Next, as the backward movement, the cutting amount of the same amount as that of the forward movement is set, and the grindstone 6 is moved in the downward direction along the same bus 5 so that the contact portion P2 is ground along the bus 5. While moving on the surface 2, the outer peripheral portion 8 of the grindstone 6 is ground again by the grinding surface 2. By the reciprocating movement along the generatrix 5, the outer peripheral portion 8 where the point P21 exists is formed into a predetermined shape. After the reciprocating movement along the same bus 5, a point (not shown) on the outer peripheral portion 8 adjacent to the point P 21 on the inside at a predetermined interval is positioned on an extension line of the adjacent bus 51 adjacent to the bus 5 at a predetermined interval. Then, the grindstone 6 is moved. Then, similarly to the reciprocating movement along the bus 5, the grindstone 6 is reciprocated along the adjacent bus 51. Further, the same reciprocating movement of the grindstone 6 is sequentially repeated with respect to the bus located inside the adjacent bus 51. Then, the reciprocating movement of the grindstone 6 at a position where the center in the thickness direction of the grindstone 6 corresponds to the generatrix 5 on the plane orthogonal to the Y axis completes the molding process on one side of the outer peripheral portion 8 in the direction of the axis 71. To do.

  Further, as shown in FIGS. 5 and 6, in the direction of the axis 71, the outer peripheral portion 8 on the other side opposite to the portion on the one side where molding is completed is molded. Also in this case, after a reciprocating movement along the same bus 5, a point (not shown) on the outer peripheral portion 8 adjacent to the point P 21 on the inside at a predetermined interval is on an extension line of the adjacent bus 52 adjacent to the bus 5 at a predetermined interval. The grindstone 6 is moved so as to be positioned. Then, similarly to the reciprocating movement along the bus 5, the grindstone 6 is reciprocated along the adjacent bus 52. Further, the same reciprocation of the grindstone 6 is sequentially repeated with respect to the bus located inside the adjacent bus 52. The other side of the outer peripheral portion 8 in the direction of the axis 71 is caused by the reciprocating movement of the grindstone 6 immediately before the center in the thickness direction of the grindstone 6 and the generatrix 5 on the plane orthogonal to the Y axis reach a corresponding position. The molding process is completed.

  By repeating such reciprocating movement so as to correspond to a plurality of points on the outer peripheral portion 8 arranged at predetermined intervals in the direction along the axis 71, the outer peripheral portion 8 of the grindstone 6 has an arc shape in cross section. To be molded. Further, the dressing of the outer peripheral portion 8 can be omitted by the polishing action of the abrasive grains released from the truer 1. As shown in FIG. 2, the angle K between the bus 5 and the axis 11 is 98 degrees in this embodiment, so the grinding surface 2 is a conical surface close to a flat surface. For this reason, the amount of the free abrasive grains staying on the abrasive surface 2 is sufficient.

  3 to 6, a mode in which the point P <b> 21 exists in a portion excluding the edge of the outer peripheral portion 8 is shown. However, in general, the molding of the outer peripheral portion 8 is started at either end edge. That is, as shown in FIG. 7, the reciprocation of the grindstone 6 is started from the position where the point P <b> 21 a located at the edge 82 of the outer peripheral portion 8 corresponds to the bus 53, or is located at the edge 81 of the outer peripheral portion 8. The reciprocating movement of the grindstone 6 is started from the position where the point P21c and the bus 55 correspond.

  In the above-described embodiment, the grindstone 6 is reciprocated with respect to the same bus bar 5, and the reciprocating movement of the grindstone 6 is performed with respect to the bus bar 5 at a different position. The movement in the upward direction may be performed only in the upward direction, and the upward movement may be performed with respect to the bus bar 5 at a different position. In this case, if the rotation direction of the grindstone 6 is clockwise as described above, the abrasive grains released from the truer 1 are likely to stay on the conical surface 2. Therefore, the polishing action of the abrasive grains can be utilized more effectively.

Therefore, according to the first embodiment, the following effects can be obtained.
(1) In the above embodiment, while the grindstone 6 moves along the generatrix 5 that forms the grinding surface 2 of the truer 1 on the conical surface, the point P1 on the generatrix 5 and the outer peripheral portion 8 of the grindstone 6 are The outer peripheral portion 8 is ground at the contact portion P2 where the point P21 contacts with a predetermined cut amount. At this time, the positional relationship between the truer 1 and the grindstone 6 was such that the normal H1 at the point P1 and the normal H6 at the point P21 were in the same direction. Further, the grindstone 6 is moved in a state in which the direction of the axis 71 is always directed in the Y-axis direction without changing. For this reason, the outer peripheral portion 8 of the grindstone 6 is easily formed into a predetermined shape by moving the grindstone 6 in correspondence with the plurality of bus bars 5 despite using a truing device having a relatively simple structure. A truing method can be provided.

  (2) In the above embodiment, the movement of the grindstone 6 along the bus 5 is performed as a reciprocating movement in the vertical direction with respect to the same bus 5. Then, after the reciprocating movement of the grindstone 6, the grindstone 6 is positioned such that points at positions adjacent to the points P <b> 21 on the outer peripheral portion 8 at a predetermined interval are located on the adjacent bus 51 adjacent to the bus 5 or the extension of the adjacent bus 52. Was moved. Further, the grindstone 6 is reciprocated along the adjacent bus 51 or the adjacent bus 52. And the same reciprocating movement was repeated. For this reason, the truing method which can form the cross-sectional shape of the outer peripheral part 8 of the grindstone 6 in circular arc shape efficiently can be provided.

  (3) In the above embodiment, the abrasive surface 2 of the truer 1 is formed as a conical surface, and the truer 1 is arranged so that the apex 3 of the conical surface is directed upward. For this reason, since the abrasive grains released from the truer 1 are likely to stay on the abrasive surface 2, a truing method capable of omitting dressing of the outer peripheral portion 8 after molding can be provided by the polishing action by the abrasive grains. .

(Second Embodiment)
Next, a second embodiment that embodies the present invention will be described with reference to FIG. 7 with a focus on differences from the first embodiment. Since the same truing device is used, its description is omitted. Further, in FIG. 7, both the second axis and the third axis are shown as a Y axis and an X axis.

  As shown in FIG. 7, the truing method of this embodiment includes two bus bars 53 that are symmetrical with respect to a plane HM1 that includes an axis 11 (see FIG. 2) passing through the center of the truer 1 and that is perpendicular to the Y axis. And the shaping | molding of the outer peripheral part 8 of the grindstone 6 is started so as to correspond to either of the bus 55. And the outer peripheral part 8 of the grindstone 6 is shape | molded by the reciprocation of the grindstone 6 along the two buses in a symmetrical position. Here, the grindstone 6 at a position corresponding to the bus bar 53 is shown as a grindstone 6a, and the grindstone 6 at a position corresponding to the bus bar 55 is shown as a grindstone 6c. A case where molding is started from the grindstone 6a located on the left side (downward in FIG. 7) with respect to the plane HM1 will be described.

  A point P21a at one end edge 82 of the grindstone 6a is located on an extension line of one bus bar 53 of the conical surface forming the abrasive surface 2 of the truer 1. Then, the grindstone 6 moves in the ascending direction along the generatrix 53 with a predetermined cutting amount, whereby the outer peripheral portion 8 of the grindstone 6 is ground at a contact portion (not shown). Then, after the grindstone 6 moves on the extension line above the bus 53 and the grindstone 6 and the grinding surface 2 are not in contact with each other, the point P21c at the other edge 81 of the grindstone 6c is located above the bus 55. The grindstone 6 is moved so as to be positioned on the extension line of. Next, the outer peripheral portion 8 of the grindstone 6 is ground at a contact portion (not shown) while the grindstone 6 moves in the descending direction along the bus 55 with the same cutting amount as when moved along the bus 53. The movement of the grindstone 6 in these upward and downward directions is the forward movement of the reciprocating movement.

  As the backward movement, after adjusting the position of the grindstone 6c on the extension line below the bus bar 55 in the direction in which the cutting amount increases, the grindstone 6 is moved in the upward direction along the bus bar 55, and the outer peripheral portion 8 of the grindstone 6 is moved. Is ground. Thereafter, the grindstone 6 is moved so that the point P21a at one end edge 82 of the grindstone 6a is located on the extension line above the bus bar 53. Then, by moving the grindstone 6 in the downward direction, after the outer peripheral portion 8 of the grindstone 6 is ground, the grindstone 6 is again in the state of the grindstone 6a, which is the starting position of the reciprocating movement. These entire strokes are one reciprocal movement of this embodiment.

  Further, after moving the grindstone 6 so that a point (not shown) adjacent to the point P21a is located on the extension line of the adjacent bus 53a adjacent to the bus 53, the grindstone 6 is adjacent to the adjacent bus 53a and the bus 55. It is reciprocated along the adjacent bus 55a in the same manner as the reciprocating movement along the bus 53 and the bus 55. After repeating the reciprocating movement of the grindstone 6 in this way, the grindstone 6 is reciprocated so that the point P21b located at the center on the outer peripheral portion 8 in the thickness direction of the grindstone 6b follows the generatrix 54 on the plane HM1. Thus, the forming of the cross-sectional shape of the outer peripheral portion 8 of the grindstone 6 in an arc shape is completed.

And in this 2nd Embodiment, in addition to the effect in 1st Embodiment, the following effects can be acquired.
(4) In the above-described embodiment, the grindstone 6 is continuously reciprocated along the two buses symmetrically with respect to the plane HM1 including the axis 11 of the truer 1 and perpendicular to the Y axis. The outer peripheral portion 8 of the grindstone 6 was ground. In this grinding, for example, as the forward movement of the grindstone 6, after the upward movement along one bus 53, the grinding wheel 6 is continuously moved downward along the other bus 55, and then as the backward movement of the grindstone 6, the bus 55 After the upward movement along the line 53, the downward movement along the bus 53 is continued. In this way, in the reciprocating movement of the grindstone 6 along the two buses, the movement direction in the opposite direction can be changed only once, so that the movement control of the support portion 9 that supports the grindstone 6 can be performed smoothly. Possible truing methods can be provided.

(Third embodiment)
Next, a third embodiment embodying the present invention will be described with reference to FIG. 8 with a focus on differences from the first and second embodiments. Since the same truing device is used, its description is omitted. Further, in FIG. 8, both the second axis and the third axis are shown as a Y axis and an X axis.

  As shown in FIG. 8, the truing method of the present embodiment includes two bus bars 53 that are symmetrical with respect to a plane HM2 that includes an axis 11 (see FIG. 2) passing through the center of the truer 1 and that is perpendicular to the X axis. And the shaping | molding of the outer peripheral part 8 of the grindstone 6 is started so as to correspond to the bus 53 of the buses 56. And the outer peripheral part 8 of the grindstone 6 is shape | molded by the reciprocation of the grindstone 6 along the two buses in a symmetrical position. Here, the grindstone 6 at a position corresponding to the bus bar 53 is shown as a grindstone 6a, and the grindstone 6 at a position corresponding to the bus bar 56 is shown as a grindstone 6d. The grindstone 6a is located on the right side (downward in FIG. 8) with respect to the plane HM2.

  A point P21a at one end edge 82 of the grindstone 6a is located on an extension line below one bus bar 53 of the conical surface forming the grinding surface 2 of the truer 1. Then, the grindstone 6 moves in the ascending direction along the generatrix 53 with a predetermined cutting amount, whereby the outer peripheral portion 8 of the grindstone 6 is ground at a contact portion (not shown). Then, after the grindstone 6 moves on the extension line above the bus bar 53 and the grindstone 6 and the grinding surface 2 are not in contact with each other, the point P21d at the end edge 82 of the grindstone 6d extends above the bus bar 56. The grindstone 6 is moved so as to be positioned on the line. Note that the point P21c and the point P21d at the end edge 82 are in symmetrical positions with respect to a plane including the axis 71 and parallel to the Z axis. Next, the outer peripheral portion 8 of the grindstone 6 is ground at a contact portion (not shown) while the grindstone 6 moves in the downward direction along the bus bar 56 with the same cutting amount as when moved along the bus bar 53. The movement of the grindstone 6 in these upward and downward directions is the forward movement of the reciprocating movement.

  Next, after moving the grindstone 6 so that an adjacent point (not shown) adjacent to the point P21d of the grindstone 6d is located on an extension line below the adjacent bus bar 56a adjacent to the bus bar 56, and making a predetermined cutting amount, The backward movement of the grindstone 6 is started. As for the grindstone 6 moved in the upward direction along the adjacent generatrix 56a, the outer peripheral portion 8 is ground at the inner portion of the edge 82 where the adjacent point is located. Thereafter, the grindstone 6 is moved so that an adjacent point (not shown) adjacent to the point P21a of the end edge 82 of the grindstone 6a is located on an extension line above the adjacent bus bar 53a. Then, by moving the grindstone 6 in the descending direction along the adjacent bus bar 53a, the outer peripheral portion 8 of the grindstone 6 is ground at the inner portion of the edge 82 where the adjacent point is located. Furthermore, the grindstone 6 is moved to a position corresponding to an adjacent bus (not shown) adjacent to the adjacent bus 53a. These entire strokes are one reciprocal movement of this embodiment.

  Thus, after repeating the reciprocating movement of the grindstone 6 with respect to the different buses of the truer 1, the grindstone 6 has a point P21b located at the center on the outer peripheral portion 8 in the thickness direction of the grindstone 6b. Are reciprocated along the bus 54 and the bus 57.

  Further, a plurality of unillustrated points on the outer peripheral portion 8 that are arranged at a predetermined interval between the center position on the outer peripheral portion 8 and the other end edge 81 and a not-illustrated point that is symmetric with them. It is made to reciprocate corresponding to the bus. The symmetrical position here means that the two points are symmetrical with respect to a plane including the axis 71 and parallel to the Z axis. Then, after the grindstone 6 moves in the upward direction along the bus 55, it moves in the downward direction along the bus 58, or moves in the upward direction along the bus 58, and then in the downward direction along the bus 55. As it moves, one cycle of grinding of the outer peripheral portion 8 of the grindstone 6 is completed. The grinding of the outer peripheral portion 8 is performed for a plurality of cycles as necessary.

  In the one-cycle grinding, a plurality of reciprocating movements are performed along two buses at symmetrical positions while the grindstone 6 moves from the position of the grindstone 6a to the position of the grindstone 6c. The manner in which the part 8 is ground is shown. However, after the grindstone 6 is moved between the grindstone 6b and the grindstone 6e, the grindstone 6 is moved to the position of the grindstone 6c or the grindstone 6f, and the grindstone 6 is moved toward the grindstone 6b or the grindstone 6e from there. In addition, a plurality of reciprocating movements along two buses at symmetrical positions can be performed.

  In the present embodiment, the truer 1 has a counterclockwise rotation direction RT as shown in FIG. For this reason, the grinding direction of the truer 1 with respect to the one end edge 82 of the grindstone 6 differs greatly between when the grindstone 6 rises along the bus 53 and when the grindstone 6 descends along the bus 56. The grinding direction is also different when the grindstone 6 moves up and down along the other generatrix. Particularly, when the point P21b is moved along the bus 54 and when the point P21e is moved along the bus 57, the grinding direction of the truer 1 with respect to the grindstone 6 is opposite. By changing the grinding direction in this way, when the grindstone 6 is a matrix grindstone, a phenomenon called a bond tail in which the binder remains behind the abrasive grains hardly occurs. Therefore, according to the method according to the present embodiment, more preferable truing is performed.

And in this 3rd Embodiment, in addition to the effect in 1st and 2nd Embodiment, the following effects can be acquired.
(5) In the above-described embodiment, each of the two bus bars symmetrically with respect to the plane HM2 including the axis 11 passing through the center of the truer 1 and orthogonal to the X axis, for example, the bus bar 53 and the bus bar 56, respectively. Thus, the grindstone 6 was moved and the outer peripheral part 8 of the grindstone 6 was shape | molded. Then, during each movement of the grindstone 6 along the two bus bars, the grinding direction of the truer 1 with respect to the grindstone 6 becomes greatly different. For this reason, since a bond tail phenomenon does not easily occur, truing of the grindstone 6 can be performed in a more preferable state.

(Example of change)
In addition, the said embodiment can also be changed and actualized as follows.
・ Although the rotation direction of the grindstone 6 is clockwise when viewed in the Y-axis direction, it should be counterclockwise.
-Although the cross-sectional shape of the outer peripheral portion 8 of the grindstone 6 is an arc shape, it should be a curved surface other than the arc shape.
In the third embodiment, the rotation direction RT of the truer 1 is counterclockwise, but it is clockwise.

  P2 ... contact portion, HM1, HM2 ... plane, 1 ... truer, 2 ... abrasive surface, 3 ... vertex, 5, 53, 54, 55, 56, 57, 58 ... bus, 6, 6a, 6b, 6c, 6d, 6e, 6f, 61, 62, 63 ... grinding wheel, 7 ... rotating shaft, 8 ... outer peripheral part, 9 ... support part, 51, 52, 53a, 55a, 56a ... adjacent bus.

Claims (6)

  Rotating to a rotating shaft oriented in a second axis direction perpendicular to the first axis by using a truer having a grinding surface formed in a conical surface and rotatably arranged around the first axis When forming a grindstone supported in a possible manner, while contacting the outer peripheral portion of the rotating grindstone and the grinding surface of the rotating truer, along the generatrix of the conical surface forming the grinding surface, A truing method, wherein the outer peripheral portion is ground by moving a contact portion where the outer peripheral portion and the grinding surface are in contact with each other.   When the contact portion is moved along a plurality of bus bars on the conical surface, the contact portion can be moved along an adjacent bus bar adjacent to the bus bar after being reciprocated along one bus bar. The grindstone is moved to a position, and the contact portion is reciprocated along the adjacent bus in the same manner as the reciprocation, and the movement of the grindstone and the reciprocation along the generatrix of the conical surface of the contact are performed. The truing method according to claim 1, wherein the cross-sectional shape of the outer peripheral portion of the grindstone is formed into an arc shape.   The movement of the grindstone in a direction along a plurality of generatrixes of the conical surface of the contact portion is along two generatrixes that are symmetrical with respect to a plane that includes the center of the truer and is orthogonal to the second axis. The contact portion is moved back and forth, and as a forward movement, the contact portion is moved in the upward direction along one bus bar at the symmetric position, and then moved along the other bus bar at the symmetric position. The contact part is moved in the descending direction, and then, as a backward movement, the contact part is moved in the ascending direction along the other bus bar, and then the contact part is moved in the descending direction along the one bus bar. The cross-sectional shape of the outer peripheral portion of the grindstone is formed into an arc shape by repeating these reciprocating movements with respect to two bus bars in symmetrical positions at different positions. Truing method.   The movement of the grindstone in a direction along a plurality of generatrixes of the conical surface of the contact portion includes a center of the truer and is in a symmetrical position with respect to a plane parallel to the first axis and the second axis. The reciprocating movement of the contact portion along one bus line, and as a forward movement, after moving the contact portion in the upward direction along one bus line of the symmetrical position, the other of the symmetrical position The contact portion is moved in a descending direction along the other bus, and then the grindstone is moved to a position where the contact portion can move along the other adjacent bus adjacent to the other bus. After moving the contact portion in the upward direction along the other adjacent bus, the contact portion is moved in the downward direction along one adjacent bus adjacent to the one bus. Movement is symmetrical at different positions By repeated for two places of the bus in the location, truing method according to claim 1, characterized in that shaping the sectional shape of the outer peripheral portion of the grinding wheel in an arc shape.   The dressing for the grindstone is omitted, wherein the outer peripheral portion of the grindstone is formed and polished by the abrasive grains that are separated from the truer and stay on the grindstone. The truing method according to item.   A truing device used in the truing method according to any one of claims 1 to 5, wherein the truing device has an abrasive surface formed in a conical surface with an apex directed upward, and rotates about a first axis. And a rotating shaft capable of supporting a grindstone while being oriented in a second axis direction perpendicular to the first shaft and capable of supporting the grindstone, and when forming the grindstone, A support portion that supports the rotating shaft in order to move a contact portion that is in contact with the grinding surface formed on the conical surface along a generatrix of the conical surface to form a cross-sectional shape of the outer peripheral portion into an arc shape. The truing device moves in the direction along each of the first axis, the second axis, and the third axis perpendicular to both axes.

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