JP2009018367A - Convex surface grinder and convex surface grinding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a convex surface grinder and a convex surface grinding method capable of completely automating on-board measurement, shortening on-board measurement time, and contributing to improvement in production efficiency. <P>SOLUTION: After completing grinding, a work sensor 49 is brought into contact with a work W2. The dimension of the ground work W2 is measured according to a signal detected by the work sensor 49. The work sensor 49 is installed on a rotary table 33 at a predetermined position where it is not interfered with the work W2 during grinding of the work and where the work W2 is not interfered with a tool T2 during measurement of the work. After the grinding, a work support means 39 and a tool support means 48 are moved relative to each other for automatically moving both or either of the work sensor 49 and the work W2. Consequently, the dimension of the ground work W2 is measured according to the signal detected by the work sensor 49 by bringing the work sensor 49 and the work W2 into contact with each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a convex curved surface grinding apparatus and a convex curved surface grinding method having a measurement function of grinding a point-to-even convex curved surface of a workpiece, such as a mold or a lens, and measuring a post-grinding dimension of the workpiece after grinding.

  Optical elements are formed by mass production. The lens molding die is processed to a desired shape accuracy and surface roughness using an ultra-precise cutting method and a grinding method. For press molding dies in aspherical lens production, separation molds (cylindrical mold and R2 convex mold) are integrated in order to reduce the number of mold faces facing the lens in order to achieve high stability and low cost of the molding system. It has shifted to the mold of the shape. In particular, there is a demand for a molding die for an optical element that can mold a point-to-even convex curved surface having an aspherical surface at the center.

  As a grinding method of the lens molding die, for example, the grinding method of Patent Document 1 has been proposed.

  On the other hand, conventionally, a convex curved surface grinding apparatus shown in FIGS. 5 to 7 is used for R2 convex grinding. The configuration will be described with reference to FIG. The convex curved surface grinding apparatus 10 is rotatable on a Z-axis slide table 11 provided on a surface plate (not shown), for example, in the direction of an arrow 13 around the C-axis 12 of the rotation axis along the Z-axis direction. A work rotation shaft 14 is provided with a work support means 15, the work support means 15 supports the work W1, and an X-axis slide table 16 provided on a surface plate (not shown) is provided with a rotation table 17. A tool rotation shaft 19 is provided on the rotation table 17 so that the rotation axis 18 rotates in the same plane as the XZ plane passing through the C axis 12 of the workpiece rotation shaft 14. Tool support means is provided on the tool rotation shaft 19. 20, the tool T 1 is supported by the tool support means 20, and the polishing blade edge at the peripheral edge of the tool T 1 is made to coincide with the B axis 21 of the rotation axis of the rotary table 17.

  Further, the convex curved surface grinding apparatus 10 includes a workpiece measuring means 22 having a manually operated probe 22a on the side surface of the X-axis slide table 16 in order to measure dimensions during and after the grinding of the workpiece W1. Yes.

According to the convex curved surface grinding apparatus 10, the workpiece rotating shaft 14 and the tool rotating shaft 19 are rotated, and the tip surface of the workpiece T 1 is brought into contact with the polishing edge of the tip surface peripheral edge of the tool T 1 coinciding with the B axis 21. By relatively operating the Z-axis slide of the Z-axis slide table 11, the X-axis slide of the X-axis slide table 16, and the rotation of the rotation table 17, the relative travel of the tool T1 with respect to the workpiece W1 is illustrated. 6 (a) → (b) → (c) → (d) → (e), the tool T1 is continuously moved and rocked for grinding. FIG. 6A shows the positional relationship between the tool T1 and the workpiece W1 immediately before polishing. FIG. 6B shows a state at the start of polishing. 6C and 6D show a state during the polishing. FIG. 6D shows a state at the end of polishing. FIG. 6B shows the state at the start of polishing.
As described above, the tool T1 is precisely grounded on the point-to-even convex curved surface that has been precisely finished and cut on the end face of the work W1, and is ground to an aspheric lens shape, and is ground on the point-to-even convex curved surface.

After the polishing, as shown in FIG. 7, the measurement is performed by two-dimensionally moving the Z-axis slide table 11 and the X-axis slide table 16 relatively. In this case, the workpiece W1 is moved away from the tool T1 by, for example, the dimension a, then moved by the dimension b, and is opposed to the probe 22a of the workpiece measuring means 22, and the workpiece measuring means 22 is manually approached from the dotted line position 22 ′. The probe 22a is brought into a position where it can come into contact with the workpiece W1, and then, as shown in FIG. 8, the Z-axis slide table 11 and the X-axis slide table 16 are relatively two-dimensionally moved, and the workpiece W1 is moved. As shown in FIGS. 8 (a) → (b) → (c) → (d) → (e), the relative travel with respect to the probe 22a is continuously moved and measured. At this time, the contact pressure of the probe 22a is detected, and the tool T1 is precisely copied with respect to the point-to-even convex curved surface of the workpiece W1 so that the contact pressure becomes constant.
JP 2002-346893 A

  However, according to the convex curved surface grinding apparatus shown in FIG. 5, when the workpiece is measured, the movement of the workpiece measuring means 22 is manual, and the full automation of the apparatus is not achieved, and the workpiece W1 is opposed to the probe 22a. The long distance traveled is a problem.

  In other words, with the recent improvement in image quality of digital cameras, the accuracy of the aspherical shape of the R2 convex type becomes stricter and the time required for measuring the aspherical shape also increases, improving the productivity of lenses and molds that generally have aspherical shapes. Has become necessary. In the production process, the ratio of the shape measurement to the whole process is about 1/2 to 1/3 depending on the precision machining apparatus of each company. Reduction of on-machine measurement time as well as reduction of shape processing time will contribute to improvement of production efficiency.

  Accordingly, an object of the present invention is to provide a convex curved surface grinding apparatus and a convex curved surface grinding method in which the on-machine measurement is completely automated, the on-machine measurement time can be shortened, and the production efficiency is improved.

  In order to achieve such an object, the present invention includes a first table and a second table, and both or both of the movements of the first table and the second table are two. A workpiece supporting means configured to move in a dimensional direction, further provided on the first table, a rotary table provided on the second table, and a tool provided on the rotary table A rotation center line that supports and rotates the work of the work support means, and a rotation center line that supports and rotates the tool of the tool support means on the rotation surface of the rotary table. The workpiece and the tool are respectively rotated so as to be in the same parallel plane, and either or either one of the first table and the second table is moved in a two-dimensional direction, and the rotation is performed. While moving table is rotating The tool and the workpiece are point-contacted on a line, and the tool is configured to grind following the convex curved surface formed on the end surface of the workpiece, further comprising a workpiece sensor, and after the grinding is completed, A detection signal of the work sensor is obtained by moving both or any one of the first table and the second table in a two-dimensional direction and moving the work sensor in contact with the work while following the work shape. In the convex curved surface grinding apparatus configured to measure a post-grinding dimension of the workpiece on the basis of the workpiece, the workpiece sensor does not interfere with the workpiece during the workpiece grinding on the rotating table, and during workpiece measurement. The workpiece is provided at a required position where it does not interfere with the tool,

  After completion of the grinding, both or either one of the first table and the second table is moved in a two-dimensional direction, and the work sensor is slid along the measurement location of the work, A convex curved surface grinding apparatus provided with a control means for controlling to measure a post-grinding dimension of the workpiece based on a detection signal of a sensor.

  According to the present invention, since the workpiece sensor is provided at a required position on the rotary table so as not to interfere with the workpiece during grinding of the workpiece and the workpiece does not interfere with the tool during workpiece measurement, the movement distance of the workpiece during workpiece measurement. Is about half the distance of the conventional distance, and the travel time is also halved, and the control unit eliminates the conventional manual when measuring the workpiece dimensions after grinding, and performs control to measure fully automatically. Top measurement is fully automated, reducing on-machine measurement time and contributing to improved production efficiency.

Hereinafter, embodiments will be described with reference to the drawings.
[Embodiment 1]

  FIG. 1 is a plan view at the start of grinding of the convex curved surface grinding apparatus 30 according to the first embodiment, and FIG. 2 is a plan view at the start of measurement.

  First, the configuration of the grinding function portion will be described with reference to FIG.

  The convex curved surface grinding apparatus 30 is provided with a Z-axis slide table (first table) 31 and an X-axis slide table (second table) 32 on a surface plate (not shown) provided with vibration isolation means. The shaft slide table 32 is provided with a rotation table 33, and the rotation center of the rotation table 33 is a B axis 34.

  A first fixed base 35 is provided on the Z-axis slide table 31, and a work rotation shaft 37 is provided on the first fixed base 35 via a bearing 36. The work rotation shaft 37 is driven by a first motor 38. The workpiece is rotated, and a workpiece support means 39 is provided at the tip of the workpiece rotation shaft 37. The drive sources for the Z-axis slide table 31, the X-axis slide table 32, and the rotation table 33 are not shown.

  With this configuration, the work rotation shaft 37 is rotatable around the C axis 40 along the Z axis direction, for example, in the direction of the arrow 41, and is slidable in the Z axis direction by the Z axis slide table 31. Although not shown in detail at the tip of the shaft, it has a chuck function for supporting the workpiece W2.

  In addition, a second fixed base 42 is provided on the rotary table 33, and a tool rotation shaft 44 is provided on the second fixed base 42 via a bearing 43. The tool rotation shaft 44 serves as the second fixed base. In this configuration, the second motor 45 is rotated by the second motor 45. The axis 46 of the tool rotation shaft 44 is provided at the same height as the C axis 40 of the workpiece rotation shaft 37, and the XZ plane passing through the C axis 40 of the workpiece rotation shaft 37 when the rotation table 33 rotates. It is turned in.

  With this configuration, the tool rotation shaft 44 can be rotated in the direction of the arrow 47 by the second motor 45, for example, can be slid in the X-axis direction by the X-axis slide table 32, and the axis of the workpiece rotation shaft 37 by the rotation table 33. Can be swung in an XZ plane passing through the shaft, and a tool (grinding stone) T2 is supported at the tip of the shaft.

  The second fixed base 42 is provided on the rotary table 33 so that the position can be adjusted in two dimensions and the position can be precisely positioned (not shown). Then, the second fixed base 42 is placed on the rotary table 33 so that the edge intersecting the XZ plane passing through the center of the tip surface of the tool T2 coincides with the B axis 34 of the rotation center of the rotary table 33. Thus, even if the edge intersecting the XZ plane passing through the center of the tip end surface of the tool T2 performs the turning of the turning table 33 and the movement of the X-axis slide table 32, the turning table 33 The tool T2 and the workpiece W2 are brought into contact with the B axis 34 for grinding.

  The control means 50 includes a motor (not shown) that moves the Z-axis slide table 31 in the Z-axis direction, a first motor 38, and a motor (not shown) that moves the X-axis slide table 32 in the X-axis direction, A motor (not shown) that rotates the rotation table 33 and a second motor 45 are driven and controlled in accordance with a grinding program to grind the workpiece W2.

  Next, the grinding function will be described.

  According to this convex curved surface grinding apparatus 30, the workpiece W2 is detachably supported by the workpiece support means 39 provided at the tip of the workpiece rotation shaft 37, and the tool T2 is provided by the tool support means 48 provided at the tip of the tool rotation shaft 44. Is detachably supported.

  According to the convex curved surface grinding apparatus 30 having the above-described configuration, the workpiece rotating shaft 37 and the tool rotating shaft 44 are rotated, the tip surface of the workpiece W2 is brought into contact with the tip surface of the tool T2 coinciding with the B axis 34, and Z The Z-axis slide of the shaft slide table 31, the X-axis slide of the X-axis slide table 32, and the rotation of the rotation table 33 are operated relatively.

  And according to this convex-curved surface grinding apparatus 30, exactly the same as the conventional convex-curved surface grinding apparatus 10 shown in FIG. 5, it is (a)-> (b)-> (c)-> (d)-> (e). As shown in the tool operation process (the reverse process may be used), the tool T2 is precisely copied from a flat surface to a concave R surface to an aspherical surface with respect to a point-to-even convex curved surface that has been precisely finished and cut on the end surface of the workpiece W2. In this case, the inclination angle of the tool rotation shaft 44 with respect to the X axis is varied according to a certain rule.

  In other words, the extension line of the dividing line that divides the tip angle of the blade of the tool T2 into two passes through the center of curvature at the polishing point of the workpiece W2 (so that the gap angles on both sides of the grinding contact are equal). .

  Thus, the convex curved surface grinding apparatus 30 operates relative to the workpiece W2 so that the tool T2 follows the convex curved surface having a convex aspheric surface at the center formed by precision cutting on the end surface of the workpiece W2. Then, the point-to-even convex curved surface of the workpiece W2 is ground with the tool T2.

  Next, the configuration of the measurement function part that is the main part of the embodiment will be described with reference to FIGS.

  In this convex curved surface grinding apparatus 30, the work sensor 49 used for measuring the workpiece after grinding the workpiece is changed from mounting on the side surface position of the conventional X-axis slide table to mounting on the rotary table. There is a special feature.

  In this embodiment, the workpiece sensor 49 is provided at a required position on the rotary table 33 so as not to interfere with the workpiece W2 when the workpiece is ground and does not interfere with the tool T2 when measuring the workpiece.

  For this reason, it is not sufficient to avoid the relative fluctuation area of the workpiece W2 with respect to the tool T2 during workpiece grinding and to mount the workpiece sensor 49 on the rotary table 33. The workpiece W2 relative to the workpiece sensor 49 during workpiece measurement is insufficient. This is because the work sensor 49 needs to be mounted on the rotary table 33 so that the relative variation area avoids interference with the tool T2.

  In this embodiment, in addition to the configuration in which the workpiece W2 does not interfere with the workpiece T2 during workpiece grinding and the workpiece W2 does not interfere with the tool T2 during workpiece measurement, the rotation table 33 needs to be rotated after the grinding is completed. The best arrangement without any problem is the arrangement shown in FIG.

  For example, in this embodiment, since the cutting edge angle of the tool T2 is 90 °, the intersection angle between the axis 46 of the tool rotation shaft 44 and the X-axis direction at the end of grinding is 45 ° (see FIG. 1). The tip of the probe 49a of the work sensor 49 is aligned with the line in the X-axis direction passing through the B-axis 34 of the rotary table 33, and the work sensor 49 is separated from the B-axis 34 by a dimension c in the Z-axis direction. It is provided on a rotating table 33.

  The dimension c of the work sensor 49 separated from the B-axis 34 in the Z-axis direction is approximately half the distance (c≈1 / 2 · b) compared to the conventional case shown in FIG. Thereby, the time until the measurement of the post-grind dimension of the workpiece W2 after the end of grinding can be shortened.

  That is, the control means 50 controls the movement of the Z-axis slide table 31 and the X-axis slide table 32 after finishing the grinding so as to follow the workpiece shape while bringing the tip of the probe 49a of the workpiece sensor 49 into contact with the workpiece W2. Move. At this time, the contact pressure of the probe 49a is detected, and the tool T2 is precisely copied with respect to the point-to-even convex curved surface of the workpiece W2 so that the contact pressure becomes constant.

  The control means 50 drives and controls a motor (not shown) that moves the Z-axis slide table 31 in the Z-axis direction and a motor (not shown) that moves the X-axis slide table 32 in the X-axis direction according to a measurement program. The workpiece is measured based on the detection signal of the workpiece sensor 49.

  FIGS. 3A to 3D show an operation process in which the tip of the probe 49a of the work sensor 49 is brought into contact with the work W2 to move in accordance with the work shape.

  In FIG. 3A, the workpiece W2 is moved by the dimension d from the state where the polishing is completed in a state where the workpiece W2 is in point contact with the cutting edge of the tool T2 (position indicated by the chain line), and one end where measurement is started is the front of the probe 49a. Fig. 6 shows a state in which it is stopped after being separated by a dimension e.

  FIG. 3B shows a state in which the workpiece W2 is moved close to the probe 49a by the dimension e and is in contact therewith. Measurement of the workpiece W2 is started from this state.

  FIG. 3C shows a state where the probe 49a has reached the convex vertex at the center of the workpiece W2.

  FIG. 3D shows a state where the work W2 has reached the measurement end of the probe 49a.

  In addition, as shown to Fig.8 (a)-(e), the operation | movement of an opposite direction may be sufficient.

  As shown in FIGS. 3A to 3D, from the positional relationship among the workpiece W2, probe 49a and tool T2, the workpiece W2 does not interfere with the workpiece W2 during workpiece grinding as shown in FIG. When the workpiece W2 does not interfere with the tool T2 during measurement and the angle bisector of the edge angle of the tool T2 coincides with the C-axis 40 of the workpiece support means 39, the tip of the probe 49a is moved to the rotary table 33. When the workpiece W2 is aligned with a line extending in the direction perpendicular to the C axis 40 of the workpiece support means 39 (X axis direction), the workpiece W2 is moved to the X position without rotating the rotation table 33 after the grinding. Measurement can be started by moving in the axial direction, and the measurement time can be greatly shortened because of the short movement distance and the completely automatic measurement unlike the conventional method.

  The control means 50 measures the size and shape of the workpiece W2 after grinding based on the detection signal of the workpiece sensor 49. In this measurement, the deviation between the target value after grinding the workpiece and the measurement dimension is calculated. And if the workpiece W2 is excessively shaved, the correction will not work, so grinding is performed so that a deviation is caused in the larger measurement dimension. If the deviation exceeds the allowable value and the measurement dimension is larger, the grinding is performed again. Perform correction grinding. Further, by calculating the deviation, the movement amount of the Z-axis slide table 31 and the X-axis slide table 32 is corrected, and the deviation is reduced as much as possible.

According to this embodiment, since the workpiece sensor is provided at a required position on the rotating table so that it does not interfere with the workpiece during workpiece grinding and does not interfere with the tool during workpiece measurement. Because the movement distance is about half of the conventional distance, the movement time is also halved, and the control unit performs the control to completely measure automatically, eliminating the conventional manual when measuring the workpiece dimensions after grinding. The on-machine measurement time can be shortened to about half, contributing to the improvement of production efficiency.
[Embodiment 2]

FIG. 4 is a plan view of the convex curved surface grinding apparatus 30A according to the second embodiment at the start of grinding.
In the second embodiment, the cutting edge angle of the tool T3 is 60 °, and in the first embodiment, the cutting edge angle of the tool T2 is 90 °. Accordingly, in the second embodiment, since the configuration other than the tool T3 is the same as that in the first embodiment, the same reference numerals as those in FIG. 1 are used, and the description of the configuration, operation, and effect is omitted.

  In the second embodiment, since the edge angle of the tool T3 is 60 °, the intersection angle between the axis 46 of the tool rotation shaft 44 and the X-axis direction at the end of grinding is 60 ° (see FIG. 3). The arrangement of the sensor 49 on the rotation table 33 is the same as in FIG.

  That is, also in the second embodiment, the workpiece sensor 49 does not interfere with the workpiece W3 at the time of workpiece grinding, and the workpiece W3 does not interfere with the tool T3 at the time of workpiece measurement. When the segment line coincides with the C-axis 40 of the work support means 39, the tip of the probe 49a passes through the B-axis of the rotary table 33 and is perpendicular to the C-axis 40 of the work support means 39 (X-axis direction). ). As a result, measurement can be started by moving the workpiece W3 in the X-axis direction without rotating the rotation table 33 after the grinding is completed, and the movement distance is short and, unlike conventional methods, completely automatic measurement is performed. Therefore, the measurement time can be greatly shortened.

The present invention is not limited to the one embodiment described above, and various modifications can be made without departing from the spirit and scope of the technical idea.
(1) In the above embodiment, the grinding / measurement of the point-to-even convex curved surface in which the aspherical surface is continuous with a plane is described using the lens molding die as a workpiece, but the present invention is applied to the end surface of another workpiece such as a lens. It is also applied to the grinding of point-even even curved surfaces that grind point-even even curved surfaces.
(2) Further, the work support structure by the work rotation axis and the tool support structure by the tool rotation axis are not limited to the structures shown in the above embodiments.
(3) In particular, in the first embodiment, the first table 31 is a Z-axis slide table, the second table 32 is an X-axis slide table, and the workpiece W2 and the tool T2 are relatively two-dimensionally movable. However, either the first table 31 or the second table 32 is a fixed table and the other is an X-Z axis slide table, and the workpiece W2 and the tool T2 are relatively two-dimensionally moved. It is good also as a structure which is free.
(4) In the above embodiment, the workpiece sensor 49 is passed through the B axis at the rotation center of the rotary table 33 and extends in a direction perpendicular to the rotation center line 40 of the workpiece support means 39 at the end of polishing. The tip of the probe 49a is made to coincide with the sensor center line so that the sensor center line is parallel to the rotation center line 40 of the work support means 39. That is, when the polishing is finished, as described in the embodiment, the measurement can be started without rotating the rotating table 33 after the polishing is finished. On the other hand, when the measurement is started, not at the end of polishing, the rotation center line 40 of the workpiece support means 39 is moved to the sensor center line by rotating the rotary table 33 by a slight predetermined angle after the polishing is completed. The rotation table 33 at this time can be rotated during the movement time of the workpiece to the measurement position. Further, since the positional relationship can be numerically input to the control means, it is not necessary to make the tip of the probe 49a coincide with a line extending in a direction perpendicular to the rotation center line 40 of the work support means 39.

The top view at the time of the grinding start of the convex curved surface grinding apparatus which concerns on Embodiment 1 of this invention Plan view at the start of measurement of the convex curved surface grinding apparatus of FIG. The enlarged plan view of the principal part which shows the measurement process of the convex curve grinding apparatus of FIG. The top view at the time of the grinding start of the convex curved surface grinding apparatus which concerns on Embodiment 2 of this invention Plan view at the start of grinding of the convex curved surface grinding apparatus according to the conventional example The enlarged plan view of the principal part which shows the grinding process of the convex curve grinding apparatus of FIG. Plan view at the start of measurement of the convex curved surface grinding apparatus of FIG. The enlarged plan view of the principal part which shows the measurement process of the convex curve grinding apparatus of FIG.

Explanation of symbols

30 ... Convex curved surface grinding device 31 ... Z-axis slide table (first table)
32 ... X-axis slide table (second table)
33 ... Rotary table 37 ... Work rotation axis 40 ... C axis 39 ... Work support means W2, W3 ... Work T2, T3 ... Tool 44 ... Tool rotation axis 46 ... Center axis 48 ... Tool support means 49 ... Work sensor 50 ... Control means

Claims (3)

It has a first table and a second table, and is configured such that the movement of both the first table and the second table or the movement of either one is a two-dimensional movement,
Furthermore, it has a work support means provided on the first table, a rotary table provided on the second table, and a tool support means provided on the rotary table, the work support means The rotation center line that rotates while supporting the workpiece and the rotation center line that rotates while supporting the tool of the tool support means are positioned so as to be in the same plane parallel to the rotation surface of the rotating table, respectively.
The workpiece and the tool are respectively rotated, and either or both of the first table and the second table are moved in a two-dimensional direction, and the tool and the tool are rotated on the rotation center line of the rotating table. The workpiece is configured to be point-contacted and ground to follow the convex curved surface formed on the end surface of the workpiece with the tool,
Furthermore, a work sensor is provided, and after finishing the grinding, both or one of the first table and the second table is moved in a two-dimensional direction, and the work sensor is brought into contact with the work while the work sensor is in contact with the work. In the convex curved surface grinding device configured to move following the shape and measure the post-grinding dimension of the workpiece based on the detection signal of the workpiece sensor,
The work sensor is provided at a required position on the rotating table so as not to interfere with the work at the time of grinding the work and at which the work does not interfere with the tool at the time of workpiece measurement.
After completion of the grinding, both or either one of the first table and the second table is moved in a two-dimensional direction, and the work sensor is slid along the measurement location of the work, 2. A convex curved surface grinding apparatus comprising control means for controlling to measure a post-grinding dimension of the workpiece based on a detection signal of a sensor.   The work sensor is provided with a sensor center line passing through the rotation center of the rotating table and the sensor center line parallel to the rotation center line of the work support means at the start of the measurement. The convex curved surface grinding apparatus according to claim 1. The work support means and the tool support means are arranged such that the rotation center line that rotates while supporting the work and the rotation center line that rotates while supporting the tool are on the same plane parallel to the rotation surface of the rotary table. The first table provided with the work support means and the second table provided with the rotary table are positioned so as to be in point contact with the rotation center line of the rotary table, and rotate the work and the tool, respectively. Both of these movements or one of the movements is a two-dimensional movement, and the tool is ground to follow the convex curved surface formed on the end face of the work.After the grinding, the work sensor and the work are In the convex curved surface grinding method for making contact from a state of being opposed to and spaced apart on one axis, and measuring a post-grinding dimension of the workpiece based on a detection signal of the workpiece sensor,
The work sensor is arranged on a required position on the rotating table so as not to interfere with the work at the time of grinding the work and at which the work does not interfere with the tool at the time of workpiece measurement.
At the end of the grinding, both or one of the first table and the second table is moved in a two-dimensional direction, and the work sensor is slid along the measured portion of the work, A convex curved surface grinding method, comprising: measuring a post-grinding dimension of the workpiece based on a detection signal of a sensor.

Images