JP3181350U - Polishing tool and polishing apparatus - Google Patents

Abstract

A polishing tool capable of performing a polishing process with high quality and a polishing apparatus using the polishing tool are provided.
A buff B is formed in a disk shape. The cross-sectional shape of the peripheral portion on the surface including the center of the buff B is an arc shape. The buff B is obtained by bonding circular cloths Bn to each other. An adhesive is used for bonding the cloths Bn. The adhesive is uniformly applied over the entire area of the cloth Bn. A separate polishing rod is applied to the peripheral surface of the rotating buff B, and an abrasive is applied to the buff B. The workpiece W can be polished by rotating the buff B coated with the abrasive.
[Selection] Figure 3

Description

  The present invention relates to a polishing tool and a polishing apparatus.

  A polishing tool for polishing the surface of a metal workpiece (hereinafter referred to as a metal workpiece) and a polishing apparatus for polishing the surface of a metal workpiece using the polishing tool are known (for example, Patent Document 1). . In the polishing apparatus described in Patent Document 1, a disk-shaped thread buff, cloth buff or sponge buff is used as a polishing tool. Here, the thread buff and the cloth buff are obtained by sewing sheet-like materials together with overlapping threads, and the sponge buff is a disk-like buff made of sponge.

JP 2011-115895 A

  By the way, in order to make the surface of the metal workpiece uniform, it is important to control the pressing force of the buff against the metal workpiece and the rotation speed of the buff. However, since the buff used in the polishing apparatus described in Patent Document 1 is soft, even when the buff is pressed against the metal workpiece with a constant force, the buff is bent or the peripheral portion of the buff is deformed. As a result, it is very difficult to keep the pressing force of the buff against the metal workpiece constant.

  Therefore, it is very difficult to make the surface of the metal workpiece uniform as the required quality of the polishing process of the metal workpiece increases.

  The present invention has been made in view of the above problems, and an object thereof is to provide a polishing tool capable of performing a polishing process with high quality and a polishing apparatus using the polishing tool.

  The present invention is a polishing tool that is formed in a disk shape and polishes a workpiece by rotating around its own axis in a state where an abrasive is applied to a peripheral surface, and a plurality of circular sheets are adhesives The adhesive is soaked in the entire area of the sheet.

  The shape of its own peripheral surface is preferably an arc shape in a cross section including the rotation axis of itself, and the central angle with respect to the arc portion is 90 ° or more.

  The present invention includes the above polishing tool and an abrasive holding mechanism that holds the other end of the abrasive so that one end of the abrasive formed in a rod shape contacts the peripheral surface of the polishing tool. In the polishing apparatus, the abrasive holding mechanism includes a holding tool disposed on the other end side of the abrasive, and a holding tool that can be connected to the holding tool. It has a buried part buried in an end face on one end side of the abrasive, and a connecting part that protrudes from an end face on one end side of the abrasive and can be connected to the other parts.

  A workpiece holding mechanism for holding the workpiece, a polishing tool rotating mechanism for rotating the polishing tool in a state in which a peripheral surface of the polishing tool coated with the abrasive is in contact with the workpiece, and the workpiece A polishing tool pressing mechanism that presses the polishing tool; and a pressing control mechanism that controls the polishing tool pressing mechanism in accordance with a torque value of a motor provided in the polishing tool pressing mechanism. preferable. Further, it is preferable that a polishing tool rotation speed control mechanism for controlling the rotation speed of the polishing tool according to a torque value of a motor provided in the polishing tool rotation mechanism is provided.

  A workpiece rotation mechanism that rotates the workpiece in the forward and reverse directions around the workpiece axis direction, and when the peripheral surface of the polishing tool to which the abrasive is applied contacts the workpiece, the rotation direction of the polishing tool and the It is preferable to include a rotation control unit that controls the workpiece rotation device and the polishing tool rotation mechanism so that the rotation direction of the workpiece is opposite when viewed from the same direction. Moreover, it is preferable that the said rotation control unit controls the said polishing tool rotation mechanism so that the said polishing tool rotates only to a fixed direction.

  The workpiece is formed in a rod shape and has a spiral groove on the workpiece surface, the workpiece rotating mechanism for rotating the workpiece around the axial direction of the workpiece, and the polishing tool in contact with the spiral groove. It is preferable that a rotating shaft moving mechanism for moving the rotating shaft in the direction of the rotating shaft and a movement control mechanism for controlling the rotating shaft moving mechanism in accordance with a torque value of a motor provided in the rotating shaft moving mechanism. Moreover, it is preferable that the width of the spiral groove is wider than the thickness of the polishing tool.

  The workpiece is formed in a rod shape, has a spiral groove on the workpiece surface, and includes a workpiece rotation mechanism that rotates the workpiece around the axial direction of the workpiece, and the polishing tool is in the axial direction of the workpiece Preferably, the polishing tool is arranged in a vertically standing posture, and is arranged obliquely with respect to the direction in which the spiral groove extends within a range in which the peripheral surface of the polishing tool contacts only the surface of the spiral groove.

  A contour of the spiral groove is arcuate in a plane orthogonal to the direction in which the spiral groove extends, and a first arc that forms a circular arc with a central angle of 90 ° in a region where the polishing tool contacts in the contour of the spiral groove. It is preferred that ~ 2 positions are included.

According to the polishing tool capable of performing the polishing process with high quality and the polishing apparatus using the polishing tool, the polishing process can be performed with high quality.

It is a side view which shows the outline | summary of a grinding | polishing apparatus. It is a front view which shows the outline | summary of a grinding | polishing apparatus. It is the III-III sectional view taken on the line which shows the outline | summary of the peripheral part of a buff. It is an enlarged view which shows the outline | summary of a grinding | polishing rod, a buff, a workpiece | work apparatus, and these periphery. It is a side view which shows the outline | summary of a stand. It is a side view which shows the outline | summary of a stand. It is a front view which shows the outline | summary of an abrasive | polishing agent holding | maintenance mechanism. It is explanatory drawing which shows the positional relationship of the buff and a workpiece | work when it sees from a stand. It is explanatory drawing which shows the positional relationship of the buff and a workpiece | work when it sees from right above. 3 is a cross-sectional view taken along the line III-III showing an outline of a rotation trajectory T of the contact region Z. Here, IV _C is a buff contour in _IV C -IV _C line cross-section in FIG. 6A, IV _R is buff contour in _IV R -IV _R line cross section of FIG. 6A, IV _L is 6B is a contour line of the buff in the IV _L -IV _L line cross section of FIG. 6A.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the polishing apparatus 2 includes a workpiece holding mechanism 10 that holds a rod-shaped workpiece W in a horizontal posture, a buff B for polishing the workpiece W, and a state in which the buff B is rotatable. A buff holding mechanism 20 for holding, a buff rotating motor 30M for rotating the buff B, an abrasive holding mechanism 40 for holding the polishing rod K, and abutting the polishing rod K against the rotating buff B, and the circumference of the buff B A buff pressing mechanism 50 that moves the buff holding mechanism 20 so that the surface is pressed against the surface of the workpiece W, and a buff slide moving mechanism 60 that moves the buff B in the longitudinal direction of the workpiece W (hereinafter referred to as the X direction). And a control unit 90 that controls each unit.

  <Workpiece> The workpiece W is a so-called ball screw screw shaft, and a linear screw shaft is provided with a spiral groove for ball rolling.

  <Buff> The buff B is formed in a disk shape. In addition, as shown in FIG. 3, the cross-sectional shape of the peripheral portion on the surface including the center line of the buff B and along the center line (the surface formed by the radial direction of the buff B and the central axis of the buff B) is an arc shape. ing. And it is preferable that the cross-sectional shape of the said peripheral part becomes a circular arc whose central angle is 45 degrees or more, or 90 degrees or more. The buff B is obtained by bonding circular cloths Bn to each other. An adhesive is used to bond the cloths Bn to each other, and this adhesive is applied over the entire area of the cloth Bn. Such a buff B has appropriate elasticity and rigidity so that the polishing conditions can be easily adjusted because a plurality of cloths Bn are bonded with an adhesive. As a forming material of the cloth Bn, any of cotton, hemp, synthetic fiber and the like may be used. As the adhesive, for example, an acrylic adhesive, a urethane adhesive, an ethylene vinyl resin adhesive, or the like can be used. In addition, it may replace with cloth Bn and may use the sheet | seat which consists of material in which adhesives can immerse, such as paper and a cork.

  Here, the “entire area of the cloth Bn” may be anything that has a stiffness sufficient to prevent the buff B from being bent or deformed when the buff B comes into contact with the workpiece W. Therefore, “the entire region of the cloth Bn” may be “the entire range from the central portion of the fabric Bn to the peripheral end in the radial direction” or “the range excluding the peripheral end portion from the entire range”. Moreover, it is preferable that the adhesive is applied uniformly over the entire area of the cloth Bn.

  Buff B contains no abrasive. For this reason, for polishing the workpiece W, it is necessary to apply the polishing rod K on the peripheral surface of the buff B prior to contact with the workpiece W. Details of the polishing rod K will be described later.

  Further, the thickness M2 of the buff B is preferably equal to the width M1 of the spiral groove Wm or narrower than the width M1 of the spiral groove Wm. In addition, although the thickness M2 of the buff B is not specifically limited, For example, they are 1 mm or more and 3 mm or less. Also, the diameter of the buff B is not particularly limited, but is, for example, 50 mm or more and 150 mm or less.

  <Work Holding Mechanism> Returning to FIGS. 1 and 2, the work holding mechanism 10 holds both ends of the work W and rotates the work W around the rotation axis AX1 extending in the X direction. A pair of legs 11, a workpiece holding plate 12 provided on the upper part of the pair of legs 11, a workpiece holding tool 13 provided on the workpiece holding plate 12, and holding the end of the rod-like workpiece W, and a rotation axis AX1. And a gripping rotation motor 14M that rotates the workpiece gripping tool 13 about the center. The workpiece gripping tool 13 can be freely changed between a gripping state in which the end portion of the workpiece W is gripped and a release state in which the gripping of the end portion of the workpiece W is released.

  <Buff Slide Moving Mechanism> The buff slide moving mechanism 60 extends in the X direction, and both ends of the slide rail 61 are fixed to a pair of legs 11, a slide base 62 that is movable in the X direction, and the slide rail 61 , A slide pedestal motor 63M for moving the slide pedestal 62, and a torque sensor 63S for detecting the torque of the slide pedestal motor 63M. The slide base 62 has an insertion hole 62X. Then, the slide rail 61 is inserted into the insertion hole 62X. Thus, since the slide rail 61 is inserted into the insertion hole 62X, the slide base 62 can move in the X direction. Then, the slide base 62 moves in the X direction by the drive of the slide base motor 63M.

  <Buff Pushing Mechanism> As shown in FIG. 4A, the buff pushing mechanism 50 is provided on the upper surface 62 </ b> U of the slide pedestal 62 and makes the buff holding mechanism 20 movable in the Y direction with respect to the slide pedestal 62. 51, a buff holding mechanism motor 52M that moves the buff holding mechanism 20 in the Y direction, and a torque sensor 52S that detects the torque of the buff holding mechanism motor 52M. Here, the Y direction refers to a direction included in the horizontal plane and orthogonal to the X direction. The buff pressing mechanism 50 moves in the Y direction with respect to the slide base 62 by driving the buff holding mechanism motor 52M. As a result, the pressing force of the buff B against the workpiece W can be controlled.

  <Buff Holding Mechanism> The buff holding mechanism 20 includes a columnar stand 21, an arm 22 whose base end portion is rotatably provided at a distal end portion of the stand 21, and an arm rotation for rotating the arm 22. A motor 23M and a holding wheel 24 provided on the free end side of the arm 22 and holding the central portion of the buff B from both sides are provided.

  As shown in FIGS. 4A to 4C, the stand 21 includes a rail fitting portion 21R that is slidably fitted to the pressing rail 51, a base portion provided on a side surface of the rail fitting portion 21R, and a distal end portion in the Y direction. A horizontal shaft 21C extending to the horizontal shaft 21C, a rotating column 21A pivotally attached to the tip of the horizontal shaft 21C and provided with an arm 22 on the top, and a rotating motor 21M that rotates the horizontal shaft 21C. Further, the horizontal shaft 21C is rotatable about its own axis with respect to the rail fitting portion 21R.

  When the rotation motor 21M is driven under the control of the motor control unit 91, the rotation column 21A is freely transitionable between the first state and a second state different from the first state. For example, in the first state, the rotating column 21A is in a posture to stand in the vertical direction (see FIG. 4B), and in the second state, the rotating column 21A is in an inclined posture (see FIG. 4C). Furthermore, a locking projection 21D protruding from the side surface of the rail fitting portion 21R is provided, and a locking hole 21E into which the locking projection 21D is inserted is provided in the rotating column 21A. The locking protrusion 21D and the locking hole 21E are locked with each other in the first state and the second state. Thus, by driving the rotation motor 21M, the direction of the buff B is the first posture standing in the vertical direction (see FIG. 4B) and the second posture oblique to the vertical direction (see FIG. 4C). It is possible to transition between the two.

  Since the base end of the arm 22 is provided so as to be rotatable with respect to the stand 21, the buff B has a contact position (see FIG. 4A) where the peripheral surface is in contact with the surface of the work W and a contact position. It can move between the retracted position (see FIG. 1).

  Further, as shown in FIG. 4A, since the rail fitting portion 21R is slidably fitted to the pressing rail 51, the buff B is movable in the Y direction, and the buff B is moved by the buff slide moving mechanism 60. It can move in the X direction.

  <Buff Rotating Motor> The buff rotating motor 30M rotates the holding wheel 24 under the control of the control unit 90. A torque sensor 30S for detecting the torque of the buff B, that is, the torque of the buff rotary motor 30M is attached to the buff rotary motor 30M.

  <Abrasive> As shown in FIG. 5, the polishing rod K is formed in a rod shape, and a powdery abrasive is hardened in a rod shape by oil. The polishing rod K is held by the abrasive holding mechanism 40 at the other end while maintaining the posture where one end is directed to the circumferential surface of the buff B.

  <Abrasive Holding Mechanism> As shown in FIGS. 4A and 5, the abrasive holding mechanism 40 includes an abrasive fixing screw 41 provided on the other end side of the polishing rod K and an abrasive screwed to the abrasive fixing screw 41. And a fixing nut 42.

  The abrasive fixing screw 41 has a screw head 41H and a screw portion 41T. The abrasive fixing nut 42 is located in the middle of the screw portion 41T in a state of being screwed with the screw portion 41T. A polishing rod K as shown in FIG. 5 is obtained by solidifying the abrasive in a rod shape based on the abrasive fixing screw 41 and the abrasive fixing nut 42 in such a state.

  Further, the abrasive holding mechanism 40 extends from the side surface of the stand 21 toward the work W side gripped by the work gripping tool 13, and is provided on the work W side from the overhanging plate 44 for polishing. An abrasive holding plate 45 that holds the rod K, and an elevating rail 46 that is provided between the overhanging plate 44 and the abrasive holding plate 45 and that allows the abrasive holding plate 45 to slide in the vertical direction. The abrasive holding plate 45 is provided with an abrasive screw hole 45X that can be screwed into the screw portion 41T. By screwing the screw portion 41T into the abrasive screw hole 45X, the polishing rod K is held in such a posture that its longitudinal direction is the vertical direction. Further, the polishing rod K is movable up and down by the lifting rail 46.

  Furthermore, the abrasive holding mechanism 40 has an abrasive rotating unit 48. The abrasive rotation unit 48 includes a rotation screw 48A extending in the vertical direction, a screw motor 48M that rotates the rotation screw 48A, a rotation gear 48G that is pivotally attached to the rotation screw 48A, and a rotation gear that is pivotally attached to the abrasive fixing nut 42. An abrasive gear 48F that meshes with 48G. The abrasive holding plate 45 is provided with a rotating screw hole 48Y that can be screwed into the rotating screw 48A.

  When the screw motor 48M is driven by the controller 90, the rotation of the rotating screw 48A is transmitted to the abrasive gear 48F via the rotating gear 48G. At this time, since the screw portion 41T is screwed into the abrasive screw hole 45X, the abrasive rod K is lowered while rotating by the rotation of the abrasive gear 48F. Further, since the rotary screw 48A is screwed into the rotary screw hole 48Y, the rotary screw 48A and the rotary gear 48G are also lowered while rotating together with the polishing rod K by the rotation of the rotary gear 48G. Of course, when the rotating screw 48A rotates in the reverse direction by driving the screw motor 48M, the polishing rod K rises while rotating. With this abrasive rotation unit 48, the one end side of the polishing rod K that contacts the buff B can be evenly consumed without being biased.

  The control unit 90 includes a motor control unit 91 that controls each motor, a torque detection unit 92 that detects the torque of the buff B, and a workpiece gripping control unit 93 that switches the workpiece gripping tool 13 between a gripping state and a release state. . The torque detector 92 reads a sensing signal from the torque sensor 30S.

  Next, the operation of the polishing apparatus 2 will be described.

  First, as shown in FIG. 2, the workpiece gripping control unit 93 grips the end portion of the workpiece W using the workpiece gripping tool 13. Thus, both ends of the work W are gripped in a horizontal state.

As shown in FIG. 4A, the workpiece W which is gripped at both ends by the work gripping tool 13, the grip and rotation motor 14M, rotates at a predetermined rotational speed in the direction D _W1 at about a rotation axis AX1. Further, buff B is rotated in the direction _{D B1} at a predetermined rotation speed by the buff rotating motor 30M.

  Next, the buff B is aligned. First, the buff B sandwiched by the holding wheel 24 by driving the arm 22 is positioned on the Y direction side of the workpiece W (see FIG. 1). Thereafter, the buff B is positioned in the X direction and the Y direction by driving the slide base motor 63M and the buff holding mechanism motor 52M. Thus, the peripheral surface of the buff B comes into contact with the workpiece W, more specifically, the spiral groove Wm of the workpiece W (see FIG. 3). At this time, it is preferable that the buff B is arranged in a posture standing upright with respect to the rotation axis AX1 of the workpiece W. Here, a region of the surface of the spiral groove Wm that contacts the peripheral surface of the buff B is referred to as a contact region Z.

  As shown in FIG. 4A, the abrasive rotation unit 48 abuts one end of the polishing rod K on the peripheral surface of the buff B. As a result, the abrasive is applied to the peripheral surface of the buff B. By the rotation of the buff B, the abrasive applied to the peripheral surface of the buff B is supplied to the contact area Z (see FIG. 3). As a result, the surface of the workpiece W is polished by the abrasive supplied to the contact area Z.

  Here, as a polishing condition for the workpiece W, the pressing force of the buff B against the workpiece W is an important condition. As described above, the buff B is obtained by bonding circular cloths Bn to each other using an adhesive, and the adhesive is uniformly applied over the entire area of the cloth Bn. Such a buff B has moderate elasticity and rigidity compared to conventional buffs (yarn buffs, cloth buffs, sponge buffs). Further, since the adhesive is present throughout the buff B, the peripheral portion of the buff B has the same elasticity and rigidity as the central portion. Furthermore, when the peripheral part of the buff B is worn by use, the adhesive is also present in the part that newly becomes the peripheral part. Therefore, the new peripheral portion also has the same elasticity and rigidity as the central portion, and the plurality of cloths Bn constituting the new peripheral portion are integrated together. Thus, since the buff B does not change the elasticity and rigidity of the new peripheral portion even when the peripheral portion of the buff B is worn, the surface state of the work W can be easily uniformed by controlling the pressing force against the work W. Can be.

  Alternatively, the motor control unit 91 controls the buff holding mechanism motor 52M so that the torque value detected by the torque sensor 52S becomes the reference value. That is, when the torque value detected by the torque sensor 52S is larger than the reference value, the motor control unit 91 reduces the pressing force of the buff B against the workpiece W through the control of the buff holding mechanism motor 52M. On the other hand, when the torque value detected by the torque sensor 52S is smaller than the reference value, the motor control unit 91 increases the pressing force of the buff B against the workpiece W through the control of the buff holding mechanism motor 52M. As a result, the pressing force of the buff B against the workpiece W can be made constant, so that the surface of the workpiece W can be finished uniformly.

  Further, as the polishing conditions for the workpiece W, not only the pressing force of the buff B against the workpiece W but also the frictional force of the buff B against the workpiece W is an important condition. Therefore, when the torque value detected by the torque sensor 30S is larger than the reference value, the motor control unit 91 makes the torque value the reference value, that is, the rotation speed of the buff B is reduced. The buff rotation motor 30M is controlled. On the other hand, when the torque value detected by the torque sensor 30S is smaller than the reference value, the motor control unit 91 performs buffing so that the torque value becomes the reference value, that is, the rotation speed of the buff B is increased. The rotary motor 30M is controlled. Thereby, the frictional force of the buff B against the workpiece W can be made constant, so that the surface of the workpiece W can be finished uniformly. In addition, in order to make the frictional force of the buff B against the workpiece W constant, the control of the buff holding mechanism motor 52M described above may be performed together.

  In addition, as the polishing conditions for the workpiece W, not only the pressing force and frictional force of the buff B against the workpiece W but also the pressing force against the spiral groove Wm in the X direction is an important condition. For this reason, when the torque value detected by the torque sensor 63S is larger than the reference value, that is, when the buff B is pressed against the movement direction side of the slide base 62 of the spiral groove Wm, the motor control unit 91 performs the slide base motor. Through the control of 63M, the slide base motor 63M is controlled so that the torque value detected by the torque sensor 63S becomes the reference value. On the other hand, when the torque value detected by the torque sensor 63S is smaller than the reference value, that is, when the buff B is pressed on the opposite side of the spiral groove Wm in the moving direction of the slide base 62, the motor control unit 91 Via the control of the motor 63M, the slide base motor 63M is controlled so that the torque value detected by the torque sensor 63S becomes the reference value. Thereby, even when the lead angle of the spiral groove Wm is not constant, the buff B can be brought into contact with the central portion of the spiral groove Wm, that is, the original polished area. As a result, even if the lead angle of the spiral groove Wm is not constant, the surface of the spiral groove Wm can be finished uniformly.

After polishing the spiral groove Wm from one end side to the other end side in the X direction, the motor control unit 91 reverses the rotation direction of the rotary screw 48A via the screw motor 48M. As a result, the polishing rod K rises while rotating. As a result, the supply of the abrasive to the contact area Z is stopped. Thereafter, it is preferable that the workpiece W is rotated in the reverse direction (direction D _W2 ) by the gripping rotation motor 14M. Accordingly, the buff B moves in the reverse direction, that is, from the other end side in the X direction to the one end side in a state where the buff B is in contact with the spiral groove Wm of the workpiece W, so that the finish of the spiral groove Wm is improved.

Meanwhile, if it contains abrasive original buff, there is a possibility that polishing even edge surface W _E of the groove is not a surface to be polished. On the other hand, since the buff B is composed of the cloth Bn not containing the abrasive and the adhesive not containing the abrasive, the buff B originally does not contain the abrasive. And when grind | polishing the workpiece | work W using this buff B, an abrasive | polishing agent is apply | coated to the surrounding surface of the buff B prior to contact | abutting with the workpiece | work W. FIG. For this reason, although an abrasive | polishing agent is supplied to the contact area | region Z, it is not supplied to another part. As a result, other parts, for example, can be prevented from being polished to a groove in the edge surface W _E.

Furthermore, since the cross-sectional shape of the peripheral portion in the surface along the center line including the center line of the buff B is an arc shape, even if excess abrasive is applied to both ends in the thickness direction of the buff B, Since the abrasive applied to both ends of the buff B in the thickness direction has a lower adhesion than the abrasive applied to the central portion of the buff B in the thickness direction, the abrasive is easily scattered by the rotation of the buff B. As a result, not polishing the to the groove of the edge surface W _E.

On the surface orthogonal to the direction in which the spiral groove Wm extends, the outline of the spiral groove Wm is arcuate (see FIG. 6C). _L and second positions _{P R} contains. Here, the first position _{P L is} a position in contact and a buff B anthracene groove Wm in IV L -IV _L line section, the second position _{P R,} anthracene buff B in IV R -IV _R line sectional This is the position where the groove Wm comes into contact. The arc central angle θ which is formed by the first position P _L and the second position P _R, as long 180 ° or less, for example, there is a 45 ° or 90 ° or the like. Thereby, the rolling of the ball in the spiral groove Wm becomes smooth.

  By the way, the workpiece W is obtained by pressing the grinder against the screw shaft to form the spiral groove Wm. However, because of the hardness of the forming material, the grinder pressed against the screw shaft is repelled slightly, resulting in the spiral groove Wm. In this case, a cutting trace extending in the direction Dr (see FIG. 6A) remains. In such a case, the minute cutting trace remaining in the spiral groove Wm is removed by making the direction of the buff B oblique to the extending direction Dr of the spiral groove Wm (see FIGS. 6A to 6C). be able to.

As described above, the outline of the spiral groove Wm is an arc shape (see FIG. 6C) on the surface orthogonal to the direction in which the spiral groove Wm extends, and the region where the polishing tool B abuts in the outline of the spiral groove Wm has a predetermined center. It includes a first position P _L and the second position P _R forms an arc angle. Thereby, the rolling of the ball in the spiral groove Wm becomes smooth.

In addition, when the minute cutting trace of the spiral groove Wm does not become a problem, the direction of the buff B (direction D _{B1 in} FIG. 6A) may be parallel to the extending direction Dr of the spiral groove Wm.

If abut the buff B to the work W, the rotation direction D _B1 buff, regardless of the polishing agent is not coated or are coated may be always the same direction. When thus reverse the direction of rotation D _B1 buff, it can not be maintained peripheral surface smooth state of the buff B, as a result, a polishing level of the workpiece W is reduced. It is presumed that the rotation of the buff B in the forward / reverse direction causes fuzz at the peripheral edge of the buff, or the cloth Bn peels off at the peripheral edge of the buff.

  Note that the workpiece W may be a rod-like shape, and may be, for example, a ball spline. Further, the workpiece W is not limited to a rod-like one, but may be a plate-like one (for example, a linear motion guide). Furthermore, the presence or absence of a groove is not questioned as the workpiece W.

  In the above-described embodiment, the thread holding portion 45 and the polishing rod K are connected by screwing the screw portion 41T into the polishing agent screw hole 45X. Any material that can be detachably connected may be used.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the scope of the present invention.

2 Polishing apparatus 10 Work holding mechanism 20 Buff holding mechanism 30M Buff rotation motor 30S Torque sensor 40 Abrasive holding mechanism 50 Buff pushing mechanism 60 Buff slide moving mechanism 90 Control unit 91 Motor control unit 92 Torque detection unit 93 Work gripping control unit B Buff K Polishing bar W Work W _E Edge surface Wm Spiral groove

Claims (11)

A polishing tool that is formed in a disk shape and polishes a workpiece by rotating around its own axis in a state where an abrasive is applied to the peripheral surface,
A plurality of circular sheets are bonded together with an adhesive,
The polishing tool, wherein the adhesive is immersed in the entire area of the sheet. The shape of its own peripheral surface is an arc shape in a cross section including the rotation axis of itself and along the rotation axis,
The polishing tool according to claim 1, wherein a central angle with respect to the arc portion is 90 ° or more. The polishing tool according to claim 1 or 2,
An abrasive holding mechanism that holds the other end of the abrasive so that one end of the abrasive formed in a rod shape contacts the peripheral surface of the polishing tool,
The abrasive holding mechanism is
A holder disposed on the other end of the abrasive;
A holding tool connectable to the holding tool;
The holder is
A buried portion buried in an end face on one end side of the abrasive;
A polishing apparatus comprising: a connecting portion that protrudes from an end face on one end side of the abrasive and can be connected to the other component. A workpiece holding mechanism for holding the workpiece;
A polishing tool rotating mechanism for rotating the polishing tool in a state where the peripheral surface of the polishing tool applied with the abrasive is in contact with the workpiece;
A polishing tool pressing mechanism for pressing the polishing tool against the workpiece;
The polishing apparatus according to claim 3, further comprising: a pressing control mechanism that controls the polishing tool pressing mechanism in accordance with a torque value of a motor provided in the polishing tool pressing mechanism.   The polishing apparatus according to claim 4, further comprising: a polishing tool rotation speed control mechanism that controls the rotation speed of the polishing tool according to a torque value of a motor provided in the polishing tool rotation mechanism. A workpiece rotation mechanism for rotating the workpiece in the forward and reverse directions around the workpiece axis direction;
When the peripheral surface of the polishing tool to which the abrasive is applied comes into contact with the workpiece, the workpiece rotation is performed so that the rotation direction of the polishing tool and the rotation direction of the workpiece are opposite to each other when viewed from the same direction. The polishing apparatus according to claim 3, further comprising: an apparatus and a rotation control unit that controls the polishing tool rotating mechanism.   The polishing apparatus according to claim 6, wherein the rotation control unit controls the polishing tool rotation mechanism so that the polishing tool rotates only in a certain direction. The workpiece is formed in a rod shape and has a spiral groove on the workpiece surface,
A workpiece rotation mechanism that rotates the workpiece around the axial direction of the workpiece;
A rotating shaft moving mechanism for moving the polishing tool in contact with the spiral groove in the rotating shaft direction of the workpiece;
The movement control mechanism which controls the said rotating shaft moving mechanism according to the torque value of the motor with which the said rotating shaft moving mechanism was equipped, The any one of Claim 3 or 7 characterized by the above-mentioned. Polishing equipment.   The polishing apparatus according to claim 8, wherein a width of the spiral groove is wider than a thickness of the polishing tool. The workpiece is formed in a rod shape and has a spiral groove on the workpiece surface,
A work rotation mechanism that rotates the work around the axial direction of the work,
The polishing tool is arranged in an upright posture perpendicular to the axial direction of the workpiece, and the spiral groove extends in a range in which the peripheral surface of the polishing tool contacts only the surface of the spiral groove. The polishing apparatus according to claim 3, wherein the polishing apparatus is disposed obliquely. In the plane orthogonal to the direction in which the spiral groove extends, the outline of the spiral groove is arcuate,
11. The polishing apparatus according to claim 10, wherein a region where the polishing tool abuts in the outline of the spiral groove includes first and second positions forming a circular arc having a central angle of 90 °.

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