JP2019147208A - Abrasive wheel shape correction device and shape correction method - Google Patents

Abstract

To provide abrasive wheel shape correction device and shape correction method by which smooth outer peripheral surface of an abrasive wheel can be obtained at a low cost.SOLUTION: A shape correction device 60 for an abrasive wheel 51 comprises: a grindstone stand 50; a shape correction tool 61; a first moving unit 21 which performs relative traverse movement of the grindstone stand 50 and the shape correction tool 61; and a control unit 70 which performs shape correction of the rotating abrasive wheel 51 by use of the shape correction tool 61. The control unit controls the first moving unit, thereby causing one of the abrasive wheel 51 and the shape correction tool 61 to perform minute reciprocation in a rotation axis direction, and at the same time, moving a center S1 of said minute reciprocation in one direction of the rotation axis direction of the abrasive wheel 51 or moving the other of the abrasive wheel 51 and the shape correction tool 61 in one direction of the rotation axis direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a grinding wheel shape correcting device and a shape correcting method.

  Conventionally, in a grinding apparatus, shape correction (dressing, truing) of the outer peripheral surface of a grinding wheel is performed using a shape correction tool (dresser, truer) in order to ensure good machining accuracy of a workpiece (Patent Documents 1-3). reference). For example, in shape correction (dressing) using a shape correction tool (rotary dresser) described in Patent Document 1, the tip of the rotary dresser is pressed against the outer peripheral surface from the direction facing the outer peripheral surface of the rotating grinding wheel, and the outer peripheral surface of the grinding wheel Cut a predetermined amount into. Thereafter, the rotary dresser and the grinding wheel are relatively moved at a predetermined speed in the axial direction of the grinding wheel while being cut by a predetermined amount, and the outermost surface of the outer circumferential surface of the grinding wheel is scraped to form a new surface.

JP 2007-175815 A JP 2011-152618 A JP 2002-361556 A

  However, in the above method, the contact locus of the rotary dresser on the outer peripheral surface of the grinding wheel scraped by the rotary dresser is spiral in the circumferential direction. For this reason, peaks are left as uncut portions between spiral grooves adjacent in the axial direction. Therefore, it may be difficult to obtain a desired smooth surface on the outer peripheral surface of the grinding wheel.

  At this time, the width of the mountain between the grooves can be shortened by very slowing the relative movement speed between the rotary dresser and the grindstone in the axial direction. Further, by repeatedly performing such a shaving operation, it is possible to eventually remove the mountains and obtain a desired smooth surface. However, such a method takes too much time and contributes to an increase in cost. Not only the rotary dresser described in Patent Document 1, but also a fixed shape correction tool (for example, a single point dresser) has the same problem.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a grinding wheel shape correcting device and a shape correcting method capable of obtaining a smooth outer peripheral surface at low cost.

(1. Grinding wheel shape correction device)
A grinding wheel shape correction device according to the present invention includes a grinding wheel, a grinding wheel base that rotatably supports the grinding wheel, a shape correction tool that corrects the shape of the outer peripheral surface of the grinding wheel, the grinding wheel base, A first movement device that relatively traverses the shape correction tool in the rotational axis direction of the grinding wheel, and the outer periphery of the grinding wheel that rotates using the shape correction tool by controlling the first movement device And a control device for correcting the shape of the surface.

  The control device controls the first moving device to cause one of the grinding wheel and the shape correction tool to reciprocate a plurality of times in the direction of the rotation axis, and at the same time, The center of the minute reciprocation in the one of the shape correction tools is moved in one direction in the rotation axis direction of the grinding wheel, or the other of the grinding wheel and the shape correction tool is moved in one direction in the rotation axis direction. Move in the direction.

  In this way, the shape correction tool corrects the shape of the outer peripheral surface while moving in a spiral manner in the circumferential direction while repeating a minute reciprocation in the rotation axis direction relative to the outer peripheral surface of the rotating grinding wheel. As a result, it is difficult to form a mountain between the spiral grooves in the direction of the rotation axis formed when the outer peripheral surface is simply moved spirally without performing micro reciprocation, that is, when the shape is corrected by the conventional technique. Therefore, the state of the outer peripheral surface of the grinding wheel whose shape has been corrected provides a smoother surface than that of the prior art. Further, the fine reciprocation of the shape correction tool can be realized by using the first moving device that the grinding device originally has. For this reason, it becomes possible to implement shape correction of the outer peripheral surface of a grinding wheel at low cost.

(2. Grinding wheel shape correction method)
The method for correcting the shape of a grinding wheel according to the present invention corrects the shape of the outer peripheral surface of the grinding wheel by moving the grinding wheel and the shape correction tool of the grinding wheel relatively in the direction of the axis of rotation of the grinding wheel. How to do it. One of the grinding wheel and the shape correction tool is caused to reciprocate a plurality of times in the rotational axis direction, and at the same time, the center of the minute reciprocation in the one of the grinding wheel and the shape correction tool is The grinding wheel is moved in one direction in the rotational axis direction, or the other of the grinding wheel and the shape correction tool is moved in one direction in the rotational axis direction. Thereby, the same effect as the case where the shape correction of the outer peripheral surface of the grinding wheel is performed by the shape correction device is obtained.

It is a schematic plan view which shows the cylindrical grinding apparatus of 1st embodiment of this invention. It is a figure explaining the contact state of the shape correction tool of a shape correction apparatus, and a grinding wheel. It is a schematic diagram explaining an action | operation when a shape correction tool carries out a fine reciprocation. It is a figure which shows the contact locus which a shape correction tool draws on the outer peripheral surface of a grinding wheel. It is a figure explaining the state where the contact track which adjoins in the outer peripheral surface of a grinding wheel overlaps. It is a flowchart explaining the action | operation of a shape correction apparatus. It is a schematic plan view which shows the cylindrical grinding apparatus of 2nd embodiment of this invention. It is a schematic plan view which shows the cylindrical grinding apparatus of 3rd embodiment of this invention.

<1. First embodiment>
(1-1. Configuration of grinding apparatus)
As an example of a grinding apparatus provided with the shape correcting apparatus 60 of this embodiment, the grinding apparatus 1 which is a table traverse type cylindrical grinding apparatus will be described as an example. As shown in FIG. 1, the grinding apparatus 1 includes a bed 10, a table 20, a headstock 30 and a tailstock 40 that rotatably support a workpiece W, a grinding wheel base 50, a shape correction device 60, a control device 70, and the like. Is provided.

  On the bed 10, the table 20 is guided and supported so as to be relatively movable in the Z-axis direction (left-right direction in FIG. 1) by a first moving device 21 using a linear motor 22 as a power source. The first moving device 21 includes a bed 10, a table 20, and a linear motor 22. The linear motor 22 includes an electromagnetic coil unit 22a attached to the table 20 and a permanent magnet plate unit 22b fixed at both ends to the bed 10, and is controlled in operation based on scale information of a linear scale read by a reading head (not shown). The

  The linear motor 22 is a known motor and is connected to the control device 70. Usually, the linear motor can be position-controlled with high speed and accuracy in a predetermined direction, and can be freely moved from a minute distance to a long distance in the position control. The linear motor 22 also has such characteristics. In addition, since the linear motor 22 is a well-known technique, it abbreviate | omits about the detailed description beyond this.

  In the first moving device 21, the linear motor 22 is operated by a command from the control device 70, and the table 20 is traversed with respect to the bed 10 in both directions of the rotation axis (Z-axis direction) of the workpiece W. A known hydrostatic bearing (not shown) is provided between the bed 10 and the table 20 to reduce friction when the bed 10 and the table 20 move relative to each other.

  On the table 20, a headstock 30 that rotatably supports the main shaft 31 is installed. The head stock 30 rotatably supports one end of the workpiece W via the main shaft 31. A center 32 that supports one end of the workpiece W is attached to the tip of the main shaft 31. The workpiece W is rotationally driven by the servo motor 33. Further, a tailstock 40 is installed on the table 20 at a position facing the headstock 30. A center 41 that supports the other end of the workpiece W is attached to the tailstock 40. The workpiece W is sandwiched and supported between the center 32 and the center 41.

  At a rear position of the table 20 on the bed 10 (upward in FIG. 1), a grinding wheel base 50 that rotatably supports the grinding wheel 51 is disposed. The grinding wheel base 50 is guided and supported by a second moving device 52 using a linear motor 55 as a power source so as to be movable in the X-axis direction (vertical direction in FIG. 1) perpendicular to the Z-axis direction. The second moving device 52 includes a bed 10, a grindstone table 50, and a linear motor 55. In the second moving device 52, the linear motor 55 is actuated in response to a command from the control device 70, and the grinding wheel base 50 (grinding wheel 51) is moved in the X axis direction (crossing the rotation axis of the grinding wheel 51 with respect to the bed 10). Move relative to both sides.

  The linear motor 55 has the same configuration as the linear motor 22 described above. That is, the linear motor 55 includes an electromagnetic coil unit 55a attached to the grinding wheel base 50 and a permanent magnet plate unit 55b fixed at both ends to the bed 10, and is based on linear scale scale information read by a reading head (not shown). Operation controlled. Similar to the linear motor 22, the linear motor 55 is a known motor and is connected to the control device 70.

  A known hydrostatic bearing (not shown) is provided between the bed 10 and the grinding wheel platform 50 to reduce friction when the bed 10 and the grinding wheel platform 50 move relative to each other. Further, the grinding wheel 51 described above is pivotally supported on the grinding wheel base 50 via a grinding wheel shaft 53 that can rotate around a rotational axis parallel to the Z-axis direction. The grinding wheel 51 is rotationally driven by a built-in type grinding wheel shaft drive motor 54.

  In addition to the linear motor 22 (first moving device 21) and the linear motor 55 (second moving device 52) described above, the control device 70 is connected to actuators such as the servo motor 33 and the grindstone shaft drive motor 54 (not shown). To control the operation of each actuator. As illustrated in FIG. 1, the control device 70 includes a first control unit 71 and a second control unit 72. The first control unit 71 controls each actuator to bring the rotating grinding wheel 51 into contact with the workpiece W and grind the workpiece W. A detailed description of the control performed by the first control unit 71 is omitted.

  Further, the second control unit 72 controls each actuator to correct the shape (dressing or truing) of the outer peripheral surface 51a of the grinding wheel 51. In other words, the second control unit 72 uses the shape correction tool 61 to control the first moving device 21 (linear motor 22), the second moving device 52 (linear motor 55), and the grindstone shaft drive motor 54 to rotate. The shape of the outer peripheral surface 51a of the grinding wheel 51 is corrected. Details will be given later.

(1-2. Shape Correction Device 60)
Next, the shape correction device 60 will be described. The shape correcting device 60 includes the above-described grinding wheel base 50, the shape correcting tool 61, the first moving device 21, and the control device 70. Here, the grindstone platform 50, the first moving device 21 and the control device 70 are also used in the configuration of the grinding device 1 described above.

  The shape correcting device 60 corrects the shape (dressing or truing) at a predetermined timing with respect to the outer peripheral surface 51a (grinding tooth surface) of the grinding wheel 51 for grinding the workpiece W by the control of the second control unit 72 (control device 70). ). At this time, the dressing is a step of scraping the outer peripheral surface 51a of the grinding wheel 51 by a predetermined depth with a shape correction tool 61 described later to expose a new grinding tooth surface. Truing is a process of adjusting the shape of the outer peripheral surface 51a of the grinding wheel 51 deformed in the grinding operation. The predetermined timing for correcting the shape refers to, for example, timing before the grinding wheel 51 performs finish grinding on the workpiece W. However, the present invention is not limited to this mode, and the shape correction is not limited as long as it is performed at an arbitrary timing.

  In the present embodiment, the shape correction tool 61 is a fixed shape correction tool. With a fixed shape correction tool, a diamond piece is usually fixed to the tip of a shank (shaft), and the outer peripheral surface (grinding tooth surface) of a rotating grinding wheel is pressed against the diamond piece. It is a tool that performs shape correction (dressing or truing).

  As shown in FIG. 2, the shape correcting tool 61 of the present embodiment includes a shaft-shaped shank 61 a and a diamond piece 61 b that are support portions. And the lower end of the shank 61a is fixed to the headstock 30. That is, the shape correction tool 61 is supported on the table 20 via the head stock 30. The diamond piece 61b is fixed to the upper end of the shank 61a.

  The diamond piece 61b is disposed and fixed at the upper end of the shank 61a so as to come into contact with the outer peripheral surface 51a of the grinding wheel 51 at the corner portion 62 when the grinding wheel 51 moves in the X-axis direction and toward the workpiece W. At this time, it is preferable that the corner 62 is arranged in the height direction (Y-axis direction) substantially coincident with the rotational axis height h1 of the grinding wheel 51 (see the two-dot chain line in FIG. 2). When the first moving device 21 moves the table 20 relative to the bed 10 in the rotation axis direction, the shape correction tool 61 is integrated with the table 20 and the headstock 30 in the rotation axis direction (Z-axis direction). Move to.

  As described above, the linear motor 22 of the first moving device 21 provided in the shape correcting device 60 causes the table 20 to move in the axial direction of the workpiece W with respect to the bed 10 in accordance with a command from the second control unit 72 (control device 70). (Z-axis direction) Relative movement (traverse movement) on both sides. That is, the first moving device 21 traverses the grinding wheel base 50 (grinding wheel 51) and the shape correction tool 61 supported by the table 20 via the headstock 30 relatively to both sides in the rotational axis direction of the grinding wheel 51. Let

  At this time, the traverse movement at the time of correcting the shape of the outer peripheral surface 51a is a movement including a plurality of minute reciprocations in the rotation axis direction (Z-axis direction). That is, in this embodiment, when the shape of the outer peripheral surface 51a of the grinding wheel 51 is corrected, the outer peripheral surface 51a and the shape correction tool 61 are brought into contact with each other in a state where the grinding wheel 51 is controlled to rotate around the rotation axis. At the same time, the shape correcting tool 61 (corresponding to one side) is reciprocally moved a plurality of times in the rotation axis direction (see FIG. 3).

  FIG. 3 is a diagram illustrating the reciprocation of the shape correction tool 61 for each time. In the graph, the horizontal axis represents the distance and direction of the reciprocating forward path and the backward path, and each time the movement is completed. The next movement is shown shifted upward. In FIG. 3, the arrow toward the left indicates the forward path. Also, the arrow pointing to the right indicates the return path. FIG. 4 is a diagram showing a contact locus P drawn in contact with the outer peripheral surface 51a of the grinding wheel 51 on which the shape correction tool 61 rotates.

  As can be seen from FIG. 4, the center S <b> 1 of each minute reciprocation of the shape correction tool 61 (one side) that repeatedly reciprocates with respect to the outer peripheral surface 51 a as the grinding wheel 51 rotates is the rotation axis of the grinding wheel 51. The minute reciprocation is controlled by the second control unit 72 (control device 70) so as to gradually move in the left direction (corresponding to one direction) in FIGS.

  In order to realize such relative movement of the shape correction tool 61 in one direction, as shown in FIGS. 3 and 4, as shown in FIGS. ) Is greater than the second movement distance L2 in the return path (movement toward the right direction (the other direction in FIGS. 3 and 4)) of the fine reciprocation (L1> L2). ) Controls the operation of minute reciprocation.

  As a result, each time the micro reciprocation is repeated, the shape correction tool 61 moves in the forward direction (one direction) with respect to the grinding wheel base 50 (grinding wheel 51), and the difference between the first movement distance L1 and the second movement distance L2 ( Move (advance) in one direction by L2-L1). At this time, the relative moving speed V1 (not shown) moving in one direction is the average speed of the minute reciprocating movement, the magnitude of the difference (L2−L1) between the first moving distance L1 and the second moving distance L2, etc. Determined by. What is necessary is just to set the 1st movement distance L1 and the 2nd movement distance L2 within the range of 10 micrometers-1000 micrometers, for example. However, not limited to this aspect, the first movement distance L1 and the second movement distance L2 may be less than 10 μm or may exceed 1000 μm.

  In the above, the center S1 of the minute reciprocation is defined as follows, for example. That is, as shown in FIG. 4, the center S1 is a curve for one reciprocation among the curves drawn by the contact locus P formed on the outer peripheral surface 51a by the shape correction tool 61 that reciprocates slightly relative to the outer peripheral surface 51a. What is necessary is just to define that it is a position which corresponds with the gravity center position G of the virtual closed space M (refer oblique line part) which P1 (refer thick line part in FIG. 4) encloses. However, this is merely an example, and the center S1 may be set with any definition.

  Further, as can be seen from FIG. 4, when a line formed by continuously connecting the centers S1 of the micro reciprocation is defined as a reference line B (corresponding to the shape of the spiral groove in the prior art), it is formed by the micro reciprocation. Each contact locus P is formed over the left and right sides so as to straddle the reference line B. The shape of the contact locus P is preferably a curve approximate to a sine curve.

  Further, as shown in FIG. 5, at least the contact trajectories Pa and Pb adjacent in the axial direction (Z-axis direction) are formed overlappingly. In other words, the contact locus Pb is formed so as to overlap with the contact locus Pa formed on the outer peripheral surface 51 a of the grinding wheel 51 by the shape correction tool 61 in the rotation of the grinding wheel 51 at least one round before. As a result, in the portion where the contact traces Pa and Pb intersect with each other, it is not possible to form a mountain that is formed between the linear grooves as in the prior art, and a preferable smooth surface is obtained. In the present embodiment, the contact trajectories Pa and Pb are each formed by a curve approximate to a sine curve. Therefore, it is difficult to form a mountain between grooves in an overlapping portion, and a smooth surface is easily obtained.

  In addition to the above-described mode, the contact locus Pb not only overlaps with the contact locus Pa formed on the outer peripheral surface 51a by the shape correction tool 61 in the rotation of the grinding wheel 51 one rotation before, but also the grinding wheel 51 The shape correction tool 61 may overlap with a plurality of contact traces formed on the outer peripheral surface 51a in the rotation two or more rounds before. Thereby, a smoother surface is obtained on the outer peripheral surface 51a of the grinding wheel 51.

(1-3. About shape correction method of outer peripheral surface 51a)
Next, a method of correcting the shape of the outer peripheral surface 51a will be described based on the flowchart of FIG. At this time, it is assumed that the grinding apparatus 1 is in a state where the grinding of the outer peripheral surface of the workpiece W is finished by the grinding wheel 51. The shape correction of the outer peripheral surface 51a is mainly performed under the control of the second control unit 72 (control device 70).

  First, in 1st process S10, the 2nd control part 72 controls the linear motor 22 of the 1st moving apparatus 21, and the table 20 with which the shape correction tool 61 is supported via the head stock 30 is set with respect to the bed 10. To move in the Z-axis direction. Further, the second control unit 72 controls the linear motor 55 of the second moving device 52 to move the grinding wheel base 50 (grinding wheel 51) in the X-axis direction with respect to the bed 10. Thereby, the outer peripheral surface 51a of the grinding wheel 51 and the corner | angular part 62 of the shape correction tool 61 are arrange | positioned facing so that it may be located in the initial position at the time of shape correction. In the present embodiment, the position where the right end of the outer peripheral surface 51a and the corner 62 of the shape correcting tool 61 face each other in FIG.

  Next, in 2nd process S20, the 2nd control part 72 controls rotation of the grindstone shaft drive motor 54, and rotates the grinding wheel 51 by the predetermined rotation speed set beforehand. At this time, the “predetermined number of rotations” means that the above-mentioned contact locus P formed on the outer peripheral surface 51a by the corner 62 of the shape correcting tool 61 contacting the outer peripheral surface 51a of the grinding wheel 51 has a desired shape. The rotation speed is set as follows. The “predetermined number of revolutions” is stored in a storage unit (not shown) included in the second control unit 72.

  Next, in 3rd process S30, the 2nd control part 72 controls the linear motor 55 of the 2nd moving apparatus 52, moves the grindstone base 50 (grinding wheel 51) to a X-axis direction, and was preset. Cut to the predetermined cutting position.

  Next, in 4th process S40, the 2nd control part 72 corrects the shape of the outer peripheral surface 51a of the grinding wheel 51 in the state which fixed the grinding wheel 51 and the shape correction tool 61 in the direction orthogonal to a rotating shaft line. In the shape correction, the second control unit 72 controls the linear motor 22 of the first moving device 21, and the table 20, that is, the shape correction tool 61 (corresponding to one) supported by the table 20 is continuously applied in the rotation axis direction. Then, it is performed by reciprocating a plurality of times.

  At this time, the minute reciprocation is as described above, and the forward path (movement toward one direction) is performed so that the contact locus P described above moves in one direction at a desired shape and a desired relative movement speed V1. ), The second movement distance L2 in the return path (movement toward the other direction), the average speed of minute reciprocation, and the like are set in advance. These preset L1 and L2, the average speed of the minute reciprocation, and the like are stored in a storage unit (not shown) of the second control unit 72.

  Thereby, in the fourth step S40, each time the minute reciprocating motion is repeated, the shape correction tool 61 differs from the grinding wheel 51 (grinding wheel base 50) between the first movement distance L1 and the second movement distance L2 (L2). -L1) gradually moves (forwards) toward the forward direction (one direction). The center S1 of the minute reciprocation moves in one direction in the rotation axis direction of the grinding wheel 51 at a predetermined relative movement speed V1.

  In the fifth step S50, it is confirmed whether or not the moving length LA that the shape correcting tool 61 has moved in one direction has reached a predetermined length LO (LA ≧ LO or LA <LO). At this time, the predetermined length LO is a length in the rotation axis direction of the outer peripheral surface 51a of the grinding wheel 51 whose shape is to be corrected.

  When the moving length LA is less than the predetermined length LO (LA <LO), the process returns to the fourth step S40 according to N, and S40 and S50 are repeatedly processed until it is determined Yes in the fifth step S50. . If the movement length LA is equal to or longer than the predetermined length LO (LA ≧ LO), the program is terminated according to Y.

  In the first embodiment, the second control unit 72 of the control device 70 controls the linear motor 55 of the second moving device 52 to control the movement of the grinding wheel base 50 (grinding wheel 51) in the X-axis direction. did. However, the present invention is not limited thereto, and the grinding wheel base 50 (grinding wheel 51) may be configured to be movable in the X-axis direction by a ball screw device. And the 2nd control part 72 may move the grindstone base 50 (grinding wheel 51) to a X-axis direction by operating a ball screw apparatus.

(1-4. Effects of First Embodiment)
According to the shape correcting device 60 of the first embodiment, the control device 70 (second control unit 72) controls the first moving device 21 to move the shape correcting tool 61 (one) in the rotation axis direction. At the same time as performing a plurality of micro reciprocations, the center S1 of the micro reciprocation of the shape correction tool 61 (one) is moved in one direction in the direction of the rotational axis of the grinding wheel 51.

  In this manner, the outer peripheral surface of the shape correcting tool 61 moves spirally in the circumferential direction of the outer peripheral surface 51a while repeating a relatively small reciprocating motion in the rotational axis direction with respect to the outer peripheral surface 51a of the rotating grinding wheel 51. Correct the shape. Accordingly, it is difficult to form a mountain between the spiral grooves in the rotation axis direction formed when the outer peripheral surface 51a is simply moved spirally without performing micro reciprocation, that is, when shape correction is performed by the conventional technique. Therefore, the state of the outer peripheral surface 51a of the grinding wheel 51 whose shape has been corrected is smoother than that of the prior art. Further, the fine reciprocating motion of the shape correcting tool 61 can be realized by using the first moving device 21 or the like originally provided in the grinding device 1. For this reason, shape correction of the outer peripheral surface 51a of the grinding wheel 51 can be implemented at low cost.

  Further, according to the first embodiment, the control device 70 (second control unit 72) is configured so that the grinding wheel 51 and the shape correction tool 61 are fixed in a direction perpendicular to the rotation axis, and the outer peripheral surface of the grinding wheel 51. The shape of 51a is corrected. Thereby, in the outer peripheral surface 51a of the grinding wheel 51, since shape correction is performed by the same cutting depth, a stable smooth surface can be formed.

  Moreover, according to said 1st embodiment, the 1st moving apparatus 21 moved the grindstone base 50 and the shape correction tool 61 relatively by using the linear motor 22 as a power source. As a result, when the control device 70 (second control unit 72) controls the linear motor 22 to reciprocate the shape correction tool 61 in the direction of the rotation axis, the control device 70 (second control unit 72) can achieve a minute and high speed. The contact locus P and the relative movement speed V1 can be easily realized.

  Further, according to the method for correcting the shape of the grinding wheel according to the first embodiment, the shape correction tool 61 (one) is caused to reciprocate a plurality of times in the direction of the rotation axis, and at the same time, the shape correction tool 61 (one) ) Is moved in one direction along the rotational axis of the grinding wheel 51. Thereby, the same effect as the case where the shape correction of the outer peripheral surface 51a of the grinding wheel 51 is performed by the shape correction device 60 of the first embodiment is obtained.

<2. Modification of First Embodiment>
(2-1. Modification 1)
In the first embodiment, the table 20 on which the shape correction tool 61 is supported is configured to be traversable by the first moving device 21. However, it is not limited to this aspect. As a first modification (see FIG. 7), the grindstone base 50 may be configured to be traversable in the Z-axis direction by the first moving device 121, and the shape correction tool 61 may be configured to be unable to traverse in the Z-axis direction. .

  In this case, the linear motor 122 (the electromagnetic coil unit 122a and the permanent magnet plate unit 122b) of the first moving device 121 is provided on the intermediate member 123 between the grindstone base 50 and the bed 10, and the grindstone is placed on the upper surface of the intermediate member 123. It is assumed that the base 50 is placed so as to be movable in the X-axis direction with respect to the intermediate member 123. And it is set as the structure which the control apparatus 170 (2nd control part 172) controls the linear motor 122, and reciprocates (micro reciprocation) of the grinding wheel base 50 (grinding wheel 51) to a Z-axis direction (traverse direction).

  As a result, the grinding wheel base 50 (grinding wheel 51) (one) is caused to perform a plurality of micro reciprocations in the direction of the rotation axis, and at the same time, the center S1 of the micro reciprocation in the shape correction tool 61 (the other) is set to the grinding wheel. 51 is moved in one direction of the rotation axis direction (leftward in FIG. 1). The effect similar to 1st embodiment is acquired also by this.

(2-2. Modification 2)
Furthermore, as a modified example 2 (not shown), a modified example 1 may be combined with the first embodiment. In other words, the first moving device 21 is reciprocated slightly by using the shape correction tool 61 as one side. However, at this time, the first movement distance L1 in the forward path and the second movement distance L2 in the backward path in the reciprocation are the same distance (L1 = L2). Then, the grinding wheel base 50 (grinding wheel 51) is traversed in the other direction by the first moving device 121, so that the center S1 of the fine reciprocation in the shape correction tool 61 is set in one direction in the rotational axis direction of the grinding wheel 51 ( The relative movement is made to the left in FIG. Also by this, the same effect as the first embodiment can be obtained.

(2-3. Modification 3)
Further, as compared with the second modification, as the third modification (not shown), the grinding wheel base 50 (the grinding wheel 51) may be used as one side and the first moving device 121 may be slightly reciprocated in the Z-axis direction. That is, the shape correction tool 61 is moved by reciprocating the grinding wheel base 50 (grinding wheel 51) in the Z-axis direction (L1 = L2) and the shape correction tool 61 is traversed in one direction by the first moving device 21. The center S1 of the minute reciprocation in 61 may be relatively moved in one direction (leftward in FIG. 1) in the rotational axis direction of the grinding wheel 51. Also by this, the same effect as the first embodiment can be obtained.

<3. Second embodiment>
Next, a second embodiment will be described. The shape correcting device 160 (see FIG. 1) according to the second embodiment is characterized in that when the shape of the outer peripheral surface 51a is corrected, the movement of the grinding wheel base 50 (the grinding wheel 51) is also controlled by the second moving device 52. It differs from the shape correction device 60 of the first embodiment. Therefore, only different points will be described in detail, and description of similar parts will be omitted. Moreover, the same code | symbol is attached | subjected and demonstrated about the same structure.

  The shape correction device 60 of the first embodiment is configured so that the control device 70 (second control unit 72) fixes the grinding wheel 51 and the shape correction tool 61 in a direction perpendicular to the rotation axis, and the outer peripheral surface of the grinding wheel 51. The shape of 51a was corrected. However, in the shape correcting device 160 of the second embodiment, the second control unit 172 of the control device 170 controls the linear motor 55 of the second moving device 52 as a power source, so that the grinding wheel 51 is shaped. Reciprocating relative to 61 in a direction perpendicular to the rotation axis (X-axis direction). Then, the second control unit 172 controls the linear motor 22 of the first moving device 21 as in the first embodiment while reciprocating the grinding wheel 51 in the X-axis direction, and the outer peripheral surface 51a of the grinding wheel 51. Correct the shape. Thus, since the linear motor 55 is used as a power source, a minute reciprocation in the X-axis direction is possible, so that the state of the outer peripheral surface 51a can be accurately controlled in a three-dimensional manner including the cutting direction. It becomes easier to obtain the outer peripheral surface 51a having a state.

<4. Third Embodiment>
Next, a third embodiment will be described. In the shape correcting device 60 of the first embodiment, the first moving device 21 reciprocates the table 20 with respect to the bed 10 in the Z-axis direction, and reciprocates the shape correcting tool 61 in the Z-axis direction. However, it is not limited to this mode. As shown in FIG. 8, the shape correcting device 260 of the third embodiment is used, and the first moving device 21 is a third moving device 321 (linear actuator) that reciprocates the table 20 with respect to the bed 10 in the Z-axis direction. The fourth moving device 322 (linear actuator) for reciprocating the shape correction tool 61 in the Z-axis direction may be separately provided. Each power source of the third moving device 321 and the fourth moving device 322 may be a linear motor or a cylinder operated by gas pressure or hydraulic pressure.

  In the above, the third moving device 321 may be configured by the linear motor 22 in the first embodiment. Moreover, the 4th moving apparatus 322 shall be fixed to the headstock 30, for example. The fourth moving device 322 includes a moving table 323 that can reciprocate in the Z-axis direction relative to the spindle table 30, and the shape correction tool 61 is fixed to the moving table 323. When the third moving device 321 of the first moving device 21 is actuated, the table 20 is moved in one direction in the Z-axis direction with respect to the bed 10 and the fourth moving device 322 is also actuated. 61 is reciprocated slightly in the Z-axis direction. Thereby, similarly to 1st embodiment, the center S1 of the micro reciprocation in the shape correction tool 61 can be moved to one direction of the rotating shaft direction of the grinding wheel 51.

<5. Other>
In the above embodiment, the corner 62 of the diamond piece 61b included in the shape correcting tool 61 is disposed so as to substantially coincide with the rotational axis height h1 of the grinding wheel 51, but this is not restrictive. The height of the corner 62 may not coincide with the rotational axis height h1 of the grinding wheel 51. The corner 62 may be arranged at a position higher or lower than the rotation axis height h1 so as to face the direction of the rotation axis of the grinding wheel 51.

  In the above embodiment, the shape correcting tool 61 is fixedly supported on the table 20 via the head stock 30. However, not limited to this aspect, the shape correction tool 61 may be directly fixed to and supported by the table 20 without using the head stock 30.

  In the above embodiment, the grinding wheel 51 is rotationally driven by the built-in type grinding wheel shaft drive motor 54. However, the present invention is not limited thereto, and the grinding wheel 51 may be driven to rotate by an external motor. Furthermore, it may be rotationally driven by any other motor.

  In the above-described embodiment, the first moving devices 21 and 121 can traverse the table 20 or the grindstone table 50 to both sides in the Z-axis direction by using the linear motors 22 and 122 as a power source, and perform a minute reciprocation in the Z-axis direction. It was possible to move. However, it is not limited to this aspect. The first moving devices 21 and 121 use a rotating motor as a power source, operate the ball screw device by the rotating operation of the motor to traverse the table 20 or the grindstone table 50 to both sides in the Z-axis direction, A minute reciprocation may be performed in the direction.

  Moreover, in the said embodiment, a static pressure bearing is provided between the bed 10 and the table 20, or between the bed 10 and the grindstone table 50, and the bed 10 and the table 20 or the bed are interposed via the static pressure bearing. However, the present invention is not limited to this mode. The bed 10 and the table 20 or the bed 10 and the grindstone platform 50 may be configured to move relative to each other (slide) via a rolling guide or a sliding guide.

DESCRIPTION OF SYMBOLS 1; Grinding device, 10; Bed, 20; Table, 21, 121; First moving device, 22, 55; Linear motor, 30; Main shaft, 31; Main shaft, 40; Tailstock, 50; Grinding wheel 51a; outer peripheral surface 52; second moving device 60, 160, 260; shape correction device 61; shape correction tool 70, 170; control device 71, 171; first control unit 72 172; second control unit, B; reference line, L1; first movement distance, L2; second movement distance, P, Pa, Pb; contact locus, S1; center, W;

Claims (8)

A grinding wheel base that rotatably supports the grinding wheel;
A shape correction tool for correcting the shape of the outer peripheral surface of the grinding wheel;
A first moving device that traverses the grinding wheel base and the shape correction tool in the direction of the rotational axis of the grinding wheel;
A control device for correcting the shape of the outer peripheral surface of the grinding wheel rotating by using the shape correction tool by controlling the first moving device;
A grinding wheel shape correcting device comprising:
The control device includes:
By controlling the first mobile device,
While causing one of the grinding wheel and the shape correction tool to perform micro reciprocation several times in the rotation axis direction,
The center of the minute reciprocation in the one of the grinding wheel and the shape correction tool is moved in one direction in the rotational axis direction of the grinding wheel, or the other of the grinding wheel and the shape correction tool is moved as described above. A grinding wheel shape correcting device that moves in one direction of the rotation axis.   The shape of the grinding wheel according to claim 1, wherein the control device corrects the shape of the outer peripheral surface of the grinding wheel in a state where the grinding wheel and the shape correction tool are fixed in a direction orthogonal to the rotation axis. Correction device. The grinding wheel shape correction device further includes a second moving device that relatively moves the grinding wheel and the shape correction tool in a direction intersecting the rotational axis direction,
The control device includes:
By controlling the second moving device, while relatively reciprocating the grinding wheel and the shape correction tool in a direction perpendicular to the rotation axis,
The shape correcting device for a grinding wheel according to claim 1, wherein the shape of the outer peripheral surface of the grinding wheel is corrected by controlling the first moving device.   The said 1st moving apparatus is a shape correction apparatus of the grinding wheel as described in any one of Claims 1-3 which relatively moves the said grinding wheel stand and the said shape correction tool by using a linear motor as a motive power source.   The said 2nd moving apparatus is a shape correction apparatus of the grinding wheel of Claim 3 which moves the said grinding wheel stand and the said shape correction tool relatively by using a linear motor as a power source.   When the control device corrects the shape of the outer peripheral surface of the grinding wheel using the shape correction tool, the contact locus formed by the shape correction tool on the outer peripheral surface of the grinding wheel is the grinding wheel. The shape correction apparatus for a grinding wheel according to any one of claims 1 to 5, wherein the shape correction tool overlaps with a contact locus formed on the outer peripheral surface at least one rotation before the rotation.   The grinding wheel shape correcting device according to claim 6, wherein the contact locus is formed by a curve approximate to a sine curve. A grinding wheel shape correction method for correcting the shape of the outer peripheral surface of the grinding wheel by relatively traversing the grinding wheel and the grinding wheel shape correction tool in the rotational axis direction of the grinding wheel,
While causing one of the grinding wheel and the shape correcting tool to perform micro reciprocation several times in the rotation axis direction,
The center of the minute reciprocation in the one of the grinding wheel and the shape correction tool is moved in one direction in the rotational axis direction of the grinding wheel, or the other of the grinding wheel and the shape correction tool is moved as described above. A method for correcting the shape of a grinding wheel, wherein the grinding wheel is moved in one direction of the rotation axis direction.

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