JP5296509B2 - Grinding method and grinding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve highly accurate grinding while simplifying the setup work, and to improve productive efficiency in the grinding for various shapes of workpiece. <P>SOLUTION: A grinding device M grinds a workpiece 1 held by a work shaft 2 by pressing the workpiece against a grinding wheel 11 held by a tool shaft 13 intersecting the work shaft 2 within a horizontal surface. In the grinding device M, the displacement of the work shaft 2 and the tool shaft 13 in a vertical direction (arrow Z direction) in a movable range are measured and memorized, and the position of the tool shaft 13 in the arrow Z direction is corrected by a servo motor 24 and a feed screw 23 based on the measured result in an optional setup for the processing of the workpiece 1. Thereby the positional deviation of the work shaft 2 and the tool shaft 13 in the horizontal surface under processing is prevented, and the simplification of the setup work and highly accurate grinding are achieved. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a grinding method and a grinding apparatus.

  For example, in a process of processing a desired spherical shape on an optical material in a process of processing an optical element made of glass or ceramics, a grinding method using a curve generator (CG) is generally applied as shown in Patent Document 1. Yes.

  In this spherical grinding machine, the optical material is held by the chuck at the tip of the workpiece axis, and the optical material is rotated by the workpiece axis while contacting the cup-type grinding wheel attached to the tool axis and rotating at high speed. Processing is performed.

  In other words, the spherical surface of the optical material to be processed is created by turning the tool axis around the point of intersection with the workpiece axis to give the cup-type grinding wheel an angle with respect to the workpiece axis, and then cup-shaped at the center of the workpiece axis. Control is performed by moving the tool axis in a direction orthogonal to the axial direction in a turning surface (horizontal plane) that is a plane including the tool axis and the workpiece axis so that the processing surface of the grinding wheel comes into contact.

The angle for turning the tool axis with respect to the workpiece axis is set by calculating from the target radius of curvature of the spherical surface and the diameter of the grinding wheel.
The amount of movement when the tool axis is moved in the direction perpendicular to the axial direction on the plane on which the tool axis turns is determined and set in the state of the remaining grinding generated in the center of the workpiece.

  The tool axis is rotatably held by a quill shaft whose center axis is eccentric with respect to the tool axis center. By rotating the eccentric quill axis, the tool axis Processing is performed by adjusting the shaft height to obtain a desired shape for the optical material.

  By the way, in the conventional spherical processing method of the optical material, the vertical displacement perpendicular to the swivel plane (horizontal plane) of the workpiece axis and the tool axis is absorbed by the rotation of the quill axis. There is a technical problem that adjustment is difficult because the amount and the amount of movement of the tool axis are not linear.

  In addition, since the tool axis and workpiece axis are newly displaced in the horizontal direction by adjusting the quill axis, again fine adjustment of the tool axis turning angle and the deviation in the direction perpendicular to the tool axis on the turning surface Is necessary, and the setup work becomes complicated.

Further, since the adjustment here is performed only at a certain reference position, it is not guaranteed in the entire operation range in the direction orthogonal to the swivel axis and the tool axis, and is shifted to the shaft height at positions other than the reference point. Therefore, when the shape of the target optical material is changed, it is necessary to perform the same adjustment again, and there is a technical problem such that processing efficiency is extremely deteriorated.
Japanese Patent Publication No. 61-33665

  An object of the present invention is to realize high-precision grinding while simplifying the setup work, and to improve production efficiency in grinding of workpieces having various shapes.

According to a first aspect of the present invention, grinding is performed by relatively pressing a workpiece rotatably supported on a workpiece axis intersecting the tool axis with respect to a grinding tool rotatably supported on a tool axis. A grinding method for
First, the displacement of each of the tool axis and the workpiece axis in a first direction orthogonal to the plane including the tool axis and the workpiece axis is measured as measurement data over the movable range of each of the tool axis and the workpiece axis. Process,
A second step of adjusting the position of the tool axis or the work axis in the first direction based on the position information of the tool axis and the work axis and the measurement data;
A grinding method is provided.

A second aspect of the present invention provides a tool shaft that rotatably supports a grinding tool;
A workpiece axis provided so as to be able to intersect with the tool axis, and a workpiece supported rotatably;
The displacement of each of the tool axis and the workpiece axis in a first direction orthogonal to the plane including the tool axis and the workpiece axis, measured over the movable range of each of the tool axis and the workpiece axis, is stored as measurement data. Storage means for
First drive means for displacing the tool axis or the work axis in the first direction;
Control means for adjusting the position of the tool axis or the work axis in the first direction via the first drive means based on the position information of the tool axis and the work axis and the measurement data;
A grinding apparatus is provided.

  ADVANTAGE OF THE INVENTION According to this invention, while simplifying a setup operation, while realizing a highly accurate grinding process, the improvement of the production efficiency in the grinding process of the workpiece of various shapes is realizable.

In the first aspect of the present embodiment, a tool shaft that rotatably supports a tool that processes an optical material and a work shaft that rotatably supports the optical material are provided, and the work shaft and the tool axis are pressed against each other. In the method of grinding optical material, the optical material attached to the workpiece axis is processed into a spherical surface with the grinding wheel attached to the tool axis.
The tool axis in the swivel plane is orthogonal to the tool axis so that the tip of the grinding wheel coincides with the center of the work axis on the swivel surface on which the work axis is stopped, the swivel angle of the tool axis, and the swivel plane on which the tool axis is swung. In accordance with the setting of the amount of movement in the direction to perform, measure the amount of deviation of the tool axis and workpiece axis at each processing point in the direction perpendicular to the swivel plane in advance, and adjust each to the shape of the desired optical material. The amount of deviation between the tool axis and the workpiece axis at the machining point is corrected based on the measurement data, and spherical processing of the optical material is performed.

A second aspect of the present embodiment is a grinding apparatus that performs the optical element grinding method of the first aspect described above.
A sensor that recognizes the machining stop position of the workpiece axis,
A sensor that monitors the turning angle of the tool axis;
A sensor that monitors the amount of movement in the direction perpendicular to the tool axis on the swivel plane that rotates the tool axis;
The displacement in the direction perpendicular to the swivel plane from the reference plane in the movable range of the tool axis and the workpiece axis is previously measured and input, and the position of each axis obtained by the sensor is determined by the position at the time of machining of each axis. A control device for calculating a deviation amount in a direction perpendicular to the turning surface;
A vertical axis for moving one of the tool axis and the work axis in the vertical direction, which corrects the amount of deviation from the calculation result from the control device;
It was set as the structure which has.

  According to each aspect of the present embodiment described above, it is possible to easily correct the amount of deviation in the direction perpendicular to the swiveling surface of the tool axis and the work axis, which has been troublesome in conventional adjustment, and it is possible to process a highly accurate spherical surface on an optical material. .

  In addition, even if the shape of the target optical material changes, adjustments can be made using the set values that have already been input, enabling setup time to be shortened. Production efficiency is improved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 is a side sectional view showing an example of a configuration of a grinding apparatus for performing a grinding method according to an embodiment of the present invention, and FIG. 2 is a plan view of the grinding apparatus according to an embodiment of the present invention. It is.

FIG. 3 is a conceptual diagram showing a configuration example of a control system in the grinding apparatus according to one embodiment of the present invention.
FIG. 4 is a plan view showing the positional relationship of each component at the time of machining in the grinding apparatus according to one embodiment of the present invention.

As illustrated in FIGS. 1 and 2, the grinding apparatus M according to the present embodiment has a configuration in which the work shaft column 4 and the turning base 18 are mounted on the base surface 28.
The work shaft column 4 supports the work shaft 2 horizontally through a pair of bearings 5, and the bearing 5 can rotate and move in the direction of the arrow X (X-axis direction) (second direction).

A workpiece 1 (workpiece) such as an optical material is detachably held at one end of the workpiece shaft 2 via a chuck 3.
A gear 8 and a bracket 10 are attached to the work shaft 2.

  The gear 8 is coaxially fixed to the work shaft 2, and the rotation of the rotary motor 6 disposed on the outer surface of the work shaft column 4 is transmitted via the drive gear 8 a and the shaft 7 that mesh with the gear 8. It has become.

The bracket 10 is fitted to the work shaft 2 so as to be idled, and a drive cylinder 9 (second drive means) fixed to the work shaft column 4 is connected to the outer end portion in parallel with the work shaft 2. .
As a result, the thrust of the drive cylinder 9 that expands and contracts is transmitted to the work shaft 2 via the bracket 10, and can be moved forward and backward in the direction of the arrow X in FIG. It can be pressed against or released from the tool.

On the other hand, a tool axis column 16 is mounted on the swivel base 18, and a tool axis housing 12 is horizontally mounted on the tool axis column 16 in a direction facing the work axis 2.
A tool shaft 13 is rotatably and coaxially supported on the tool shaft housing 12, and a grinding wheel 11 is fixed to a tip portion of the tool shaft 13 with a screw (not shown) so as to be exchanged.

A pulley 14 is attached to the rear end portion of the tool shaft 13 and is connected to a rotation motor (not shown) via a belt 15 so as to be rotationally driven.
The turning base 18 that supports the tool shaft 13 via the tool shaft column 16 and the tool shaft housing 12 is configured to turn in the arrow S direction (fourth direction) about the turning center O.

A vertical line passing through the turning center O is set so as to pass through a spherical spherical center processed into the workpiece 1 held by the workpiece axis 2.
That is, the tool shaft 13 mounted on the turning base 18 is attached to the turning center O passing through the spherical spherical center to be machined so as to be turnable in the direction of arrow S by the servo motor 17 (fourth driving means).

  A rotary encoder 26 is attached to the servo motor 17, and the relative angle θ between the rotation center axis A of the tool shaft 13 and the rotation center axis B of the work shaft 2 can be measured and set.

  The tool axis column 16 rotates on the turning center O on the turning base 18 (that is, a plane including the rotation center axis B of the work axis 2 and the rotation center axis A of the tool axis 13). It is installed to be slidable in the arrow Y direction (third direction) (Y axis direction) orthogonal to the rotation center axis A, and the amount of movement in the arrow Y direction can be adjusted by the feed screw 19 and the nut 20. .

  A servo motor 22 (third drive means) is connected to the feed screw 19 via a coupling 21, and the movement amount of the tool shaft 13 in the arrow Y direction is controlled by the rotation of the servo motor 22.

A laser displacement sensor 27 for monitoring the amount of movement of the tool axis column 16 in the arrow Y direction is attached to the outer surface of the tool axis column 16.
The tool shaft housing 12 is movably fixed by a feed screw 23 in the arrow Z direction (Z axis direction) (first direction) in the vertical direction (that is, the vertical direction in FIG. 1 orthogonal to the swivel plane). Adjustment in the arrow Z direction is possible.

A servo motor 24 (first driving means) is connected to the feed screw 23, and adjustment of the tool shaft 13 in the arrow Z direction is performed by rotation of the servo motor 24.
The rotary encoder 26 and the laser displacement sensor 27 are each connected to a control device 25 (control means).

  The control device 25 is connected to the rotary motor 6, the drive cylinder 9, the servo motor 17, the servo motor 22, and the servo motor 24 described above, and can send a control signal to these to drive each motor and cylinder. It has become.

  The rotary encoder 26 measures the relative angle θ between the rotation center axis A of the tool shaft 13 and the rotation center axis B of the work shaft 2 and inputs it to the control device 25, and the laser displacement sensor 27 calculates the coordinates in the arrow Y direction. It is possible to measure and input to the control device 25.

Here, the laser displacement sensor 27 may be a position sensor such as an eddy current displacement sensor.
In the case of the grinding apparatus M of the present embodiment, the control device 25 is configured by information processing including a microprocessor, for example, and the control device 25 is provided with a memory 25a.

  The memory 25a stores a data table 25b (storage means) for storing information as described later, and a control program 25c for performing control and arithmetic operations of the grinding apparatus M as described later.

In other words, the control device 25 executes a control program 25c to perform a later-described control operation and arithmetic operation using information in the data table 25b.
As illustrated in FIG. 3, in the case of the present embodiment, the control device 25 stores the following information in the data table 25b of the memory 25a.

That is, when the base surface 28 provided as the apparatus reference surface is used as a reference, the coordinates (θ1, θ2) in the arrow S direction when the rotation center axis A of the tool shaft 13 is swung in a range in which the tool shaft 13 can be swung in the arrow S direction. ,..., Θn) with respect to the displacement amount (Zθ1, Zθ2,..., Zθn) of the tool shaft 13 in the Z-axis direction,
The amount of displacement (ZY1, ZY2,..., Z axis direction of the tool axis 13 with respect to the coordinates (Y1, Y2,..., Yn) in the arrow Y direction when the tool axis 13 moves within a range movable in the arrow Y direction. ZYn)
The displacement amount (ZX1, ZX2,..., Z axis direction of the workpiece axis 2 with respect to the coordinates (X1, X2,..., Xn) in the arrow X direction when the workpiece axis 2 moves within a range movable in the arrow X direction. ZXn) is previously input to the data table 25b.

Next, the processing method by the grinding apparatus M of this Embodiment is demonstrated.
The control device 25 sets the diameter of the grinding wheel 11 from the input value of the target curvature radius in the shape of the target workpiece 1 after completion of processing, and sets the rotation center axis A of the tool shaft 13 and the rotation center axis of the workpiece shaft 2. The relative angle θ of B is calculated.

Next, the control device 25 turns the tool shaft 13 (the turning base 18) about the turning center O shown in FIGS. 2 and 4 by the servo motor 17 by a relative angle θ.
Next, the control device 25 moves the tool axis column 16 in the direction of the arrow Y in FIGS. 2 and 4 by the servo motor 22 so that the tip 11a of the grinding wheel 11 and the rotation center axis B of the workpiece axis 2 coincide. Move and adjust.

When the adjustment is completed, the control device 25 reads the position coordinates (θtn, Ytn) of the tool shaft 13 from the rotary encoder 26 and the laser displacement sensor 27 and determines them.
At this time, if the shape of the desired optical material as the workpiece 1 is a convex shape, the state shown in FIG. 4 is obtained. Align side tip 11b. That is, the upper left side of the grinding wheel 11 of FIG.

  Next, the control device 25 feeds the workpiece shaft 2 during machining in order to finish the workpiece 1 to a desired medium thickness (in this case, the thickness dimension in the direction of the optical axis (rotation center axis B) of the workpiece 1). An amount (amount of movement in the direction of the arrow X) is set.

The feed amount of the work shaft 2 is adjusted by the pushing amount of the drive cylinder 9, and the coordinate Xn at which the work shaft 2 completes machining is determined.
The control device 25 recognizes whether or not the amount of extrusion has reached a set value by a sensor (not shown) that detects the displacement of the workpiece shaft 2 in the arrow X direction.

The state of each axis such as the work axis 2 and the tool axis 13 (coordinate point information) set in the setup work so far is always transmitted to the control device 25.
In the control device 25 that has received the transmitted information, the displacement data Zwn (Xwn) of the displacement of the workpiece axis 2 from the base surface 28 with respect to the coordinate Xwn of the workpiece axis 2 is measured in advance and is input to the data table 25b. Next, data Ztn (θtn, Ytn) = Zθn + ZYn of the displacement of the tool shaft 13 from the base surface 28 with respect to the coordinates θtn and Ytn of the tool shaft 13 is similarly measured in advance and input to the data table 25b. Read from displacement data.

Here, if the measurement data of each axis input to the data table 25b of the control device 25 is conceptually shown in advance, the result is as shown in FIG.
The control device 25 uses the following equation (1) based on the displacement data from the base surface 28 of each axis read from the data table 25b, and the difference in displacement between the tool axis 13 and the workpiece axis 2 in the arrow X direction. The quantity δ is calculated.

δn = Zwn (Xwn) −Ztn (θtn, Ytn) (1)
After δn is calculated, the control device 25 sends a signal to the servo motor 24 provided on the tool shaft 13, and moves the tool shaft 13 in the arrow Z direction by the difference amount δn.

With the above control, when the machining operation of the workpiece 1 is completed, the workpiece axis 2 and the tool axis 13 are aligned with no positional deviation in the direction of arrow Z in FIG.
According to the grinding apparatus M of the present embodiment, there is no difference in displacement in the arrow Z direction in FIG. 1 between the workpiece shaft 2 and the tool shaft 13, and the workpieces are in a state where the heights in both Z-axis directions match. 1 is completed, it is possible to realize creation of an optical functional surface having good shape accuracy with respect to the shape of a desired optical material as the workpiece 1.

  In addition, since the data table 25b stores in advance data on the displacement amounts of the tool axis 13 and the workpiece axis 2 at each machining point, even if the shape of the workpiece 1 such as an optical material to be machined is changed, The control device 25 can easily adjust the position of the tool shaft 13 in the direction of the arrow Z, shorten the setup time associated with a change in the shape specification of the workpiece 1 and the like, and improve production efficiency.

  That is, according to the grinding apparatus M of the present embodiment, high-precision grinding for the workpiece 1 is realized while simplifying the setup work, and improvement in production efficiency in grinding of the workpiece 1 having various shapes is realized. be able to.

(Embodiment 2)
Next, another embodiment of the present invention will be described.
In the following second embodiment, a method for adjusting the position of the tool shaft 13 in consideration of wear of the grinding wheel 11 will be exemplified.

The basic apparatus configuration used in the second embodiment is the same as that of the grinding apparatus M exemplified in the first embodiment.
However, the difference is that the control program 25c of the control device 25 further includes a calculation function based on an algorithm described later.

Next, the processing method in Embodiment 2 of this invention is demonstrated.
In the case of using a material obtained by sintering, for example, diamond abrasive grains and a binder mainly composed of a metal material as the grinding wheel 11, the diamond grains of the abrasive grains are removed as the grinding process is performed.

  When a large number of workpieces 1 such as optical materials are processed continuously, the contact of the grinding wheel 11 that repeatedly contacts the workpiece 1 is worn and deformed, and the processing completion position of the workpiece shaft 2 is higher than the initial setting position as shown in FIG. Shift toward the tool shaft 13 in the direction of the arrow X.

  When the workpiece 1 has a convex shape, the distance from the tip of the grinding wheel 11 to the turning center O becomes longer, and the radius of curvature R becomes larger than the desired shape of the workpiece 1. Conversely, when the desired workpiece 1 has a concave shape, the radius of curvature R is smaller than the desired shape of the workpiece 1, and the spherical surface after completion of machining is deviated from the desired radius of curvature, and is located at the center of the spherical surface. Grinding residue (navel) occurs.

  Therefore, as the shape of the grinding wheel 11 changes as described above, the relative angle θ formed between the rotation center axis A of the tool shaft 13 and the rotation center axis B of the work shaft 2 and the tool on the swivel base 18 of the tool shaft 13. It is necessary to correct the position in the arrow Y direction perpendicular to the axis 13.

In the case of the second embodiment, the above correction is performed by the control device 25 as follows.
First, the coordinate Xwr of the work completion position of the workpiece axis 2 is determined. That is, the coordinate Xwr is input to the control device 25.

Next, the radius of curvature Rr of the workpiece 1 after machining and the diameter Dr of the grinding residue (navel) measured by a simple curvature meter are input to the control device 25.
In the control program 25c of the control device 25, a correction algorithm for performing calculation at the coordinate Xr using the information on the input curvature radius Rr and diameter Dr is implemented. The relative angle θ formed by the rotation center axis B of the shaft 2 and the coordinate Y in the arrow Y direction in FIG. 2 orthogonal to the tool shaft 13 and the tool shaft 13 on the turning base are calculated as the corrected relative angle θtr and position Ytr. The

  Next, using the calculation result, the control device 25 uses the coordinate (relative angle θtr and position Ytr) of the tool axis 13 to determine the displacement amount data Ztr (θtr, Ytr) of the tool axis 13 in the arrow Z direction in FIG. ) Is read from the measurement data input in advance in the data table 25b, and the displacement amount Zwr (Xwr) of the workpiece axis 2 from the base surface 28 at the machining completion position Xwr of the workpiece axis 2 is also read from the data table 25b. The calculation processing of the difference δr of the displacement amount of each axis is performed by inputting into the same expression (2) as the above expression (1).

δr = Zwr (Xwr) −Ztr (θtr, Ytr) (2)
The control device 25 transmits a signal for moving the tool shaft 13 in the direction of the arrow Z in FIG. 1 to the servo motor 17 based on the difference δr between the displacement amounts of the two axes obtained as the calculation result of the equation (2). Then, control is performed to match the positions of the workpiece axis 2 and the tool axis 13 in the Z-axis direction.

  Even if the grinding wheel 11 is worn by continuous processing by the control by the control device 25 described above, it is possible to correct the thickness, curvature radius, and grinding residue (navel) of the desired optical material as the workpiece 1, When the machining operation of the workpiece 1 is completed, the workpiece axis 2 and the tool axis 13 coincide with each other with no positional deviation (displacement amount) in the direction of arrow Z in FIG.

The workpiece 1 after machining is free from grinding residue (navel), and the thickness and curvature radius of the workpiece 1 are as designed.
According to the second embodiment, even if the shape of the workpiece 1 such as an optical material is changed or corrected, there is no displacement (displacement) between the workpiece axis 2 and the tool axis 13 in the direction of arrow Z in FIG. Since the grinding process is completed while maintaining the positions of the axis 2 and the tool axis 13 in the direction of the arrow Z, the machined surface with good shape accuracy can be obtained in the workpiece 1.

  Further, the correction of the position of the tool shaft 13 in the arrow Z direction is performed by measuring the thickness of the workpiece 1 such as the optical material after processing, the radius of curvature, and the size of the grinding residue (navel) and inputting them to the control device 25. It is only necessary to improve work efficiency.

Needless to say, the present invention is not limited to the configuration exemplified in the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
[Appendix 1]
It consists of a tool axis that rotatably supports the tool that processes the optical material and a work axis that rotatably supports the optical material. The optical material attached to the work axis is brought close to the work axis and the tool axis. In the grinding method of optical material that is spherically processed with a grinding wheel attached to the tool axis, a vertical reference plane is set on the device, and the tool axis and workpiece axis in the vertical direction are set in advance over the movable range of the tool axis and workpiece axis. A method of grinding an optical material, characterized by measuring a displacement and adjusting a vertical deviation between a tool axis and a workpiece axis at a processing point from measurement data according to a desired shape of the optical material.
[Appendix 2]
Sensor for monitoring the positions of the workpiece axis and tool axis at the machining point when machining the desired shape of the optical material in the grinding method of the optical material shown in Appendix 1, and the apparatus reference plane in the movable range of the workpiece axis The workpiece axis height displacement from the tool axis and the tool axis height displacement from the reference plane in the tool axis movable range are input so that the workpiece axis height and tool axis height match at the machining point of the optical material. An optical material grinding apparatus comprising: a control box capable of calculation; and a movement axis that allows a tool axis or a work axis to move in the apparatus vertical direction in response to a command from the control box.

It is a sectional side view which shows an example of a structure of the grinding device which implements the grinding method which is one embodiment of this invention. It is a top view of the grinding device which is one embodiment of the present invention. It is a conceptual diagram which shows the structural example of the control system in the grinding apparatus which is one embodiment of this invention. It is a top view which shows the positional relationship of each component at the time of the process in the grinding device which is one embodiment of this invention.

Explanation of symbols

1 Work 2 Work Shaft 3 Chuck 4 Work Shaft Column 5 Bearing 6 Rotating Motor 7 Shaft 8 Gear 8a Drive Gear 9 Drive Cylinder 10 Bracket 11 Grinding Wheel 11a Tip 11b Tip 12 Tool Shaft Housing 13 Tool Shaft 14 Pulley 15 Belt 16 Tool Axis column 17 Servo motor 18 Rotating base 19 Feed screw 20 Nut 21 Coupling 22 Servo motor 23 Feed screw 24 Servo motor 25 Controller 25a Memory 25b Data table 25c Control program 26 Rotary encoder 27 Laser displacement sensor 28 Base surface

Claims (6)

A grinding method in which a workpiece supported rotatably on a workpiece axis intersecting the tool axis is relatively pressed and ground with respect to a grinding tool rotatably supported on a tool axis,
First, the displacement of each of the tool axis and the workpiece axis in a first direction orthogonal to the plane including the tool axis and the workpiece axis is measured as measurement data over the movable range of each of the tool axis and the workpiece axis. Process,
Based on the position information of the tool axis and the work axis and the measurement data, the position of the tool axis or the work axis in the first direction is determined in the first direction between the work axis and the tool axis. A second step of adjusting the positions to match ,
A grinding method comprising: The grinding method according to claim 1,
The workpiece axis is movable in a second direction that is an axial direction of the workpiece axis,
The tool axis is movable in a third direction orthogonal to the tool axis in the plane, and in a fourth direction rotating around the intersection of the tool axis and the work axis in the plane,
In the first step, the measurement data of the displacement in the first direction is measured for each displacement in the second direction, the third direction, and the fourth direction. The grinding method according to claim 2, wherein
In the second step, the second direction calculated from the position coordinates of the workpiece axis in the second direction at the completion of machining, the radius of curvature of the workpiece at the completion of machining, and the diameter of the grinding center of the rotation center. And correcting the position of the tool axis or the work axis in the first direction due to wear of the grinding tool based on the position coordinates of the tool axis in the third direction and the measurement data. Grinding method. A tool shaft that rotatably supports the grinding tool;
A workpiece axis provided so as to be able to intersect with the tool axis, and a workpiece supported rotatably;
The displacement of each of the tool axis and the workpiece axis in a first direction orthogonal to the plane including the tool axis and the workpiece axis, measured over the movable range of each of the tool axis and the workpiece axis, is stored as measurement data. Storage means for
First drive means for displacing the tool axis or the work axis in the first direction;
Based on the position information of the tool axis and the work axis and the measurement data, the position of the tool axis or the work axis in the first direction is determined via the first drive means, and the work axis and the tool axis. Control means for adjusting the position in the first direction to coincide with each other ;
A grinding apparatus comprising: The grinding apparatus according to claim 4, wherein
further,
Second driving means for displacing the workpiece axis in a second direction that is an axial direction of the workpiece axis;
Third driving means for driving the tool axis in a third direction orthogonal to the tool axis in the plane;
A fourth driving means for driving the tool axis in a fourth direction rotating around the intersection of the tool axis and the work axis in the plane;
With
The measurement data of the storage means stores a displacement in the first direction measured in each displacement in the second direction, the third direction and the fourth direction. . The grinding apparatus according to claim 5, wherein
The control means includes
An arithmetic function for calculating the position coordinates of the tool axis in the second direction and the third direction from the radius of curvature of the workpiece and the diameter of the remaining grinding at the center of rotation when machining is completed;
Based on the position coordinates of the work axis in the second direction when the machining is completed, the position coordinates of the tool axis in the second direction and the third direction, and the measurement data, the first driving means The position of the said tool axis | shaft or said workpiece | work axis | shaft in the said 1st direction accompanying the wear of the said grinding tool is corrected via this.

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