JP2006263834A - Grinding method and cylindrical grinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding method and a cylindrical grinder, grinding the end face of a work at high grade without any increase in scale of the whole cylindrical grinder and without complicating grinding work. <P>SOLUTION: According to this grinding method, the peripheral surface 22 of a cylindrical part 21 and the end face 24 of a flange part 23 in a work 20 having the cylindrical part 21 and the flange part 23 connected to the cylindrical part 21 are ground by this cylindrical grinder using a grinding wheel 10, the end face of which is formed to have a back taper. A dimensional change in the Z-axis direction in the end face 14 of the grinding wheel 10 is calculated from a dimensional change of outside diameter of the grinding wheel 10, and the correction based upon the calculated value is made to grind the end face 24 under the drive control in the Z-axis direction of the grinding wheel 10 to the work 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a grinding method and a cylindrical grinder, and more particularly to a grinding method and a cylindrical grinder that grind a workpiece using a grinding wheel whose end face has a back taper shape. It is.

  When grinding the end face of the workpiece with a cylindrical grinder, the end face of the grinding wheel (hereinafter referred to as the “grinding wheel end face”) is brought into contact with the end face of the work (hereinafter referred to as the “work end face”). If the grindstone end face is brought into wide contact with the work end face, grinding burn is likely to occur, and there is a possibility that good grinding cannot be realized. This is because the coolant does not enter the contact portion between the workpiece and the grinding wheel in a state where the grinding wheel end surface is in wide contact with the workpiece end surface, and chips are not discharged well from the contact portion between the workpiece and the grinding wheel. This is due to various factors such as the abrasive grains coming into contact with the workpiece and causing unnecessary rubbing even after the workpiece material is scraped off by the grains.

  Therefore, for example, as shown in FIG. 2, the grindstone end surface 14 has a shape having a so-called “back taper” which is a surface inclined toward the inner direction of the grinding wheel 10, and the workpiece end surface 24 and the grindstone end surface 14 are in line contact with each other. Generally, it is made difficult to cause grinding burn by making contact in a state close to. 2 shows an example in which the grinding wheel 10 is moved relative to the workpiece 20 in the thrust direction (arrow A) that is the axial direction of the workpiece 20 to grind the workpiece end surface 24. The same applies to the case where the grinding wheel 10 is moved in the radial direction that is the radial direction of the workpiece 20 to grind the workpiece end surface 24.

  The above background art is a general matter, and the applicant of the present application does not particularly know a document in which a description specifying the background art is made at the time of filing.

  By the way, when grinding a workpiece with a cylindrical grinder, it is rare to grind the end surface of the workpiece exclusively, and the outer circumferential surface of the workpiece (hereinafter referred to as the grinding wheel circumferential surface) is Hereinafter, it is common to perform grinding of the “work surface”. In other words, it is usual to perform grinding of the workpiece end surface by the grindstone end surface in association with grinding of the workpiece circumferential surface by the grindstone circumferential surface.

  When the workpiece circumferential surface is ground by the grinding wheel circumferential surface in this way, the outer diameter of the grinding wheel decreases due to wear associated with grinding and truing of the grinding wheel circumferential surface. Here, when the outer diameter dimension of the grinding wheel changes, the position of the outer peripheral end on the grindstone end surface changes because the grindstone end surface has a back taper shape. That is, the “dimension in the Z direction” that is the dimension in the width direction of the grinding wheel changes. Specifically, as shown in FIG. 3, when the outer diameter of the grinding wheel 10 that is the diameter of the grinding wheel peripheral surface 13 is φDa and the position of the outer peripheral end of the grinding wheel end surface 14 is point A. When the outer diameter of the grinding wheel 10 decreases to φDb while the dimension in the Z-axis direction of the grinding wheel end surface 14 is Za, the position of the outer peripheral end of the grinding wheel end surface 14 becomes a point B, which is only the dimension L. Retreating, the dimension in the Z-axis direction on the grindstone end face 14 becomes Zb.

  And if a change occurs in the dimension in the Z-axis direction on the end face of the grindstone, it becomes impossible to ensure a high degree of dimensional accuracy in grinding the end face of the workpiece. In a grinding wheel having a back taper, the greater the inclination angle of the back taper, the greater the change in the dimension in the Z-axis direction relative to the change in the outer diameter, and the greater the change in the outer diameter. The amount of change in the dimension in the Z-axis direction also increases.

  On the other hand, when the workpiece end surface is ground by the grindstone end surface, the grindstone end surface is naturally worn, and this causes a change in the dimension in the Z-axis direction on the grindstone end surface. Specifically, as shown in FIG. 4, even if the dimension in the Z-axis direction of the grindstone end surface 14 is Z0, the position of the outer peripheral end of the grindstone end surface 14 is retracted by the dimension M due to wear associated with grinding. Thus, the dimension in the Z-axis direction is Z1. Therefore, there is a possibility that grinding with high dimensional accuracy cannot be performed even by wear of the end face of the grindstone accompanying grinding. In a grinding wheel having a back taper, the larger the inclination angle of the back taper, the larger the amount of change in the dimension in the Z-axis direction due to wear of the grinding wheel end surface, and the angle of the corner of the grinding wheel is more acute. Therefore, the wear of the grindstone end face is significantly generated.

  For this reason, when trying to obtain a high degree of dimensional accuracy when grinding a workpiece end face with a cylindrical grinder, the dimension of the grindstone end face is accurately measured and the grinding wheel Z-axis direction relative to the workpiece is conventionally measured. Must be controlled. And in order to do so, a measuring device that actually measures the dimension of the grinding wheel in the Z-axis direction is used, or grinding of the workpiece end surface is actually performed, and the finished dimension is measured in the Z-axis direction of the grinding wheel. The dimensions have to be determined, and the entire cylindrical grinder has to have a large structure, and the entire grinding work has to be complicated.

  The present invention has been made in view of the above-described actual situation, and can grind the end surface of the workpiece without making a large-scale structure of the entire cylindrical grinder or complicating the entire grinding operation. It is an object to provide a processing method and a cylindrical grinder.

The main means taken by the present invention to solve the above problems are as follows.
“By a cylindrical grinding machine using a grinding wheel having an end surface with a back taper, a circumferential surface of the cylindrical portion and an end surface of the flange portion in a workpiece having a cylindrical portion and a flange portion following the cylindrical portion, A grinding method for grinding
The change in the Z-axis direction dimension at the end face of the grinding wheel is calculated from the change in the outer diameter of the grinding wheel, and the drive control in the Z-axis direction of the grinding wheel with respect to the workpiece is corrected based on the calculated value, Grinding method characterized by grinding the end face "
It is.

  In the above grinding method, the amount of change in the Z-axis direction of the grindstone end face is not actually measured, but a value calculated from the amount of change in the outside diameter of the grinding wheel, in other words, the outside diameter of the grinding wheel. The value estimated from the change is used, and based on this value, correction is made when the grinding wheel is driven in the Z-axis direction with respect to the workpiece. It is possible to perform advanced grinding on the workpiece end face without complicating the process.

  In addition, if the back taper is a simple inclined surface that is inclined at a constant angle with respect to a surface orthogonal to the circumferential surface of the grinding wheel, for example, by calculating using a trigonometric function, the inclination angle is θ, and the outer diameter of the grinding wheel Can be calculated as the amount of change in the Z-axis direction, but if the shape of the back taper is a complicated inclined surface such as a curved surface or inclined in multiple stages, this value can be calculated. What is necessary is just to calculate the amount of change in the Z-axis direction using a predetermined arithmetic expression according to the shape of the inclined surface.

In the means described above,
“A grinding method characterized by grinding the end face of the workpiece on the condition that the feed amount per rotation of the workpiece is 0.0001 to 0.02 mm in the Z-axis direction.”
It is good.

  The amount of wear of the grindstone varies depending on various grinding conditions, but varies depending on, for example, the amount of feed per rotation of the workpiece during grinding. That is, generally, when the feed amount is large, the wear amount of the grindstone increases, while when the feed amount is small, the wear amount of the grindstone decreases. Here, if the feed amount exceeds 0.02 mm, the wear of the grindstone end face becomes severe, and even if the estimated value as described above is used as the dimension of the grindstone end face in the Z-axis direction, this estimated value is the actual dimension. There is a possibility that a high degree of dimensional accuracy cannot be secured.

  Therefore, in the above-described end surface grinding method, the feeding amount per rotation of the workpiece in the Z-axis direction is set to 0.02 mm or less. Thereby, even if the estimated value as described above is used as the dimension in the Z-axis direction of the grindstone end face, it is possible to ensure a high degree of dimensional accuracy. In addition, as an upper limit of the amount of feeding, it is 0.007 mm or less, Preferably it is 0.005 mm or less, More preferably, it is good to set it as 0.003 mm or less.

  On the other hand, in order to reduce the wear amount of the grindstone, it is only necessary to reduce the feeding amount. For this purpose, a grinding feed speed (generally, mm / min) which is a moving speed of the grinding wheel with respect to the workpiece during grinding processing. (Represented in units) or the number of rotations of the workpiece (generally expressed in units of min-1 or rpm) may be increased. However, if the grinding feed rate is decreased, the time required for grinding is reduced. It will cause the negative effect of becoming longer. Further, in order to increase the number of rotations of the workpiece, there is a limit due to the shape of the workpiece and the mechanical performance of the cylindrical grinder, and the grinding feed rate may have to be slowed down. Furthermore, by slowing down the grinding speed, rubbing of the abrasive grains against the workpiece material occurs unnecessarily, causing grinding burns, and the sharp cutting edges of the abrasive grains are flattened by rubbing, and the sharpness of the grindstone becomes worse. May cause adverse effects.

  Therefore, in the above grinding method, the feeding amount per rotation of the workpiece in the Z-axis direction is set to 0.0001 mm or more. Thereby, favorable grinding can be realized without causing the above-described adverse effects. Note that the lower limit of the feeding amount is 0.0003 mm or more, preferably 0.0005 mm or more, and more preferably 0.0007 mm or more. Moreover, it is suitable to set it as 0.001 (+/- 20%) together with the above-mentioned upper limit.

Next, as a cylindrical grinder,
“Using a grinding wheel having an end surface with a back taper, grinding is performed on the peripheral surface of the cylindrical portion and the end surface of the flange portion in a workpiece having a cylindrical portion and a flange portion following the cylindrical portion. A cylindrical grinder to be applied,
An end face change amount calculating means for calculating a change amount of a dimension in the Z-axis direction on the end face of the grinding wheel based on a change amount of an outer diameter dimension of the grinding wheel;
A cylindrical grinding machine comprising: drive control means for performing correction based on a value calculated by the end face change amount calculating means to control driving of the grinding wheel in the Z-axis direction with respect to the workpiece "
It is.

  The cylindrical grinding machine can suitably realize the above-described grinding method. That is, the amount of change in the Z-axis direction dimension at the grindstone end face is estimated by the end face change amount calculating means, and the Z value of the grinding wheel with respect to the workpiece is reflected by the drive control means by reflecting this estimated value. Axial direction drive is controlled, and by providing the end face variation calculation means and the drive control means, a measuring device for the grindstone end face that actually measures the dimension in the Z axis direction on the grindstone end face is provided. The workpiece end surface can be subjected to high-grade grinding without requiring an operation for determining the dimension in the Z-axis direction of the grindstone end surface from the dimension of the workpiece end surface after processing. Therefore, according to the above cylindrical grinder, it is possible to perform advanced grinding on the workpiece end surface without making the entire cylindrical grinder large-scale structure or complicating the entire grinding work.

  The end face change amount calculation means may be any means that calculates the change amount of the dimension in the Z-axis direction at the end face of the grinding wheel based on the input change amount of the outer diameter of the grinding wheel. The amount of change in the outer diameter of the grinding wheel may be a value input manually by the operator, or may be a value input from a measuring device that actually measures the outer diameter of the grinding wheel. , Such as a value input from an arithmetic unit that calculates the actual outer diameter of the grinding wheel by a signal from a sizing device that measures the dimensions of the workpiece being processed, is automatically input mechanically without relying on manual operations. It may be a value. In particular, the amount of change in the outer diameter is automatically transferred from the grinding wheel outer diameter monitoring means that monitors the actual change in the outer diameter of the grinding wheel to the end face change amount calculation means. If the grinding wheel is configured to be inputted to the grinding wheel, the change in the outer diameter of the grinding wheel is reflected in real time (including not only during grinding but also in the grinding process of the next workpiece), The movement in the Z-axis direction can be controlled.

In the means described above,
“A cylindrical grinder comprising a sizing device for measuring the outer diameter of the cylindrical portion of the workpiece”
It is good.

  Since the sizing device measures the outer diameter of the workpiece being processed, the outer diameter of the grinding wheel can be accurately determined by the outer diameter of the workpiece and the position of the grinding wheel at that time. In addition, the amount of change in the dimension in the Z-axis direction on the end face of the grinding wheel calculated by the end face change amount calculation means can be made closer to the actual value from the accurate outer diameter size of the grinding wheel. Therefore, according to the said cylindrical grinder, a further advanced grinding process can be given to a workpiece | work end surface.

In the means described above,
“A cylindrical grinding machine comprising a truing amount measuring device for measuring a truing amount on the circumferential surface of the grinding wheel”
It is good.

  The truing amount measuring device can accurately measure the truing amount of the peripheral surface of the grinding wheel, that is, the amount removed by truing. Can be determined. Then, the amount of change in the dimension in the Z-axis direction on the end face of the grinding wheel calculated by the end face change amount calculation means can be made closer to the actual value from the accurate outer diameter dimension of the grinding wheel. Therefore, according to the said cylindrical grinder, a further advanced grinding process can be given to a workpiece | work end surface.

  As described above, according to the present invention, a grinding method and a cylindrical grinding machine capable of performing an advanced grinding process on a workpiece end surface without making the entire cylindrical grinding machine have a large structure or making the grinding work complicated. Can be provided.

  Next, an example of a grinding method and a cylindrical grinding machine according to the present invention will be described in detail with reference to the drawings. The cylindrical grinder described below has a configuration for realizing the grinding method of the present invention, and details of the grinding method will be described in the description of the appropriate configuration of the cylindrical grinder. To do.

  FIG. 1 shows an outline of a functional configuration of the cylindrical grinder. The cylindrical grinding machine includes a work table (not shown) that supports and rotates a work table having a support device such as a spindle head and a tailstock, a grindstone shaft on which the grinding wheel 10 is detachably mounted, A wheel head (not shown) having a bearing that rotatably supports the wheel shaft and a rotation driving device such as a motor that rotates the wheel shaft, and the wheel head is moved in the Z-axis direction with respect to the work table. A well-known structure is used in a structure including various devices such as a Z-axis drive device 40 to be driven and an X-axis drive device 50 that moves and drives the grindstone table in the X-axis direction with respect to the work table. Detailed description of these devices will be omitted.

  In this cylindrical grinding machine, the grinding wheel 10 having an end surface 14 formed in a shape having a back taper is used, and the end surface 14 of the workpiece 20 is ground by the end surface 14 of the grinding wheel 10. Further, in this example, the grinding wheel 10 in which the inclination angle of the back taper (the angle inclined with respect to the orthogonal surface orthogonal to the circumferential surface 13) is 0.1 to 10 °, more specifically 2 to 5 °. In the drawing, the inclination angle is exaggerated for convenience. However, the present invention is not limited to this, and the inclination angle of the back taper of the grinding wheel 10 can be arbitrarily set.

  Further, in this example, the grinding wheel 10 is configured to include a metal base 11 formed in a disc shape and a grinding stone 12 fixed to the outer peripheral portion of the base 11. As described above, a CBN (cubic boron nitride) grindstone is employed. However, the present invention is not limited thereto, and other types of grinding wheels 10 or other types of grindstones 12 may be employed.

  On the other hand, in this example, a workpiece 20 having a shape having a cylindrical portion 21 and a flange portion 23 is representatively shown. In this workpiece 20, a so-called “traverse” for moving the grinding wheel 10 in the axial direction of the workpiece 20 is shown. In the “cut grinding”, the peripheral surface 22 of the cylindrical portion 21 is ground by the peripheral surface 13 of the grinding wheel 10, and the end surface 24 of the flange portion 23 is ground by the end surface 14 of the grinding wheel 10. The flange portion 23 does not narrowly indicate a shape that extends uniformly from the cylindrical portion 21 over the entire circumference. For example, in a crankshaft, the outer peripheral surface of a crank journal or a crankpin is ground. Accordingly, grinding is performed on the end surface of the crank arm that connects the crank journal and the crank pin. Accordingly, the flange portion 23 in a broad sense is also a shape that extends from at least a part of the entire circumference of the cylindrical portion 21 such as a crank arm of such a crankshaft.

  The cylindrical grinding machine includes a drive control device 30, and the drive control device 30 drives the Z-axis drive device 40 and the X-axis drive device 50 that are configured using a feed screw mechanism, a linear motor, or the like, respectively. Be controlled. In addition, the drive control device 30 includes a calculation unit 31, and corrects each drive control of the Z-axis drive device 40 and the X-axis drive device 50 based on the calculation value in the calculation unit 31. Although not shown in the figure, the drive control device 30 controls the drive of other equipment such as a main shaft rotation drive device and a grindstone shaft rotation drive device, and a computer such as a CNC device or NC device is used. It is configured by an appropriate device.

  In addition, the cylindrical grinding machine of this example includes a sizing device 60 that measures the outer diameter of the cylindrical portion 21 of the workpiece 20. Here, the sizing device 60 is configured using an appropriate device such as a device that transmits a signal to the drive control device 30 when the outer diameter of the cylindrical portion 21 of the workpiece 20 is a dimension set in advance by grinding. ing.

  In this cylindrical grinding machine, the operation of the drive control device 30 is calculated from the size of the outer diameter of the cylindrical portion 21 of the workpiece 20 being processed measured by the sizing device 60 and the position of the grinding wheel 10 in the X-axis direction. The outer diameter dimension of the grinding wheel 10 is calculated by the unit 31, and the calculation result is used to drive control of the X-axis drive device 50 in the current machining or the X-axis drive device 50 for grinding the next workpiece 20. This is reflected in the drive control.

  In addition, although illustration is omitted, in addition to the sizing device 60, or by omitting the sizing device 60 and separately truing the peripheral surface 13 of the grinding wheel 10 with a truer, the amount removed by truing That is, a truing amount measuring device for measuring the “truing amount” may be provided. Thus, by accurately measuring the truing amount by the truing amount measuring device, it is possible to determine the accurate outer diameter of the grinding wheel 10 after truing. Here, as a truing amount measuring device, a well-known device such as one that measures the truing amount and the outer diameter of the grinding wheel 10 from the position of the truer and the position of the grinding wheel 10, or that uses an AE sensor or the like is used. It can be adopted as appropriate.

  The cylindrical grinder includes an end face change amount calculating means for calculating a change amount in the Z-axis direction of the end face 14 of the grinding wheel 10 based on a change amount in the outer diameter dimension of the grinding wheel 10, and an end face change amount calculating means. Drive control means for performing correction based on the calculated value to control the driving of the grinding wheel 10 in the Z-axis direction with respect to the workpiece 20, and calculating the result of the end face change amount calculating means based on the Z-axis drive in the current machining. This is reflected in the drive control of the device 40 and the drive control of the Z-axis drive device 40 when the next workpiece 20 is ground. Next, end face change amount calculation means and drive control means will be described.

  The end face variation calculation means is configured by using the calculation unit 31 of the drive control device 30, and the outer diameter of the grinding wheel 10 that changes with grinding or the truing of the peripheral surface 13 of the grinding wheel 10 is determined. The outside diameter dimension of the grinding wheel 10 that changes with the time is monitored constantly or in a timely manner, and the amount of change in the dimension in the Z-axis direction is calculated from the amount of change in the outside diameter based on a preset arithmetic expression.

  Further, the drive control means is configured by using the drive control device 30 that controls the drive of the Z-axis drive device 40, and the correction according to the amount of change in the dimension in the Z-axis direction calculated by the calculation unit 31. The drive control of the Z-axis drive device 40 in the current machining and the drive control of the Z-axis drive device 40 when grinding the next workpiece are performed.

  In this example, the end face variation calculation means has a configuration using the sizing device 60 that measures the outer diameter of the grinding wheel 10, but the present invention is not limited to this, and in a cylindrical grinder equipped with a truing amount measuring device, When the end face change amount calculating means truws the peripheral surface 13 of the grinding wheel 10, the dimensional change amount in the Z-axis direction is calculated based on the change amount of the outer diameter of the grinding wheel 10 due to the truing. Become. In such an aspect, the drive control of the Z-axis drive device 40 may be corrected for each truing. In other words, in such an aspect, the drive control means performs correction based on the value calculated by the end face change amount calculation means for each truing to control the driving of the grinding wheel 10 relative to the workpiece 20 in the Z-axis direction. It should be.

  By the way, even if the Z-axis direction dimension that changes in the grinding wheel 10 is estimated from the outer diameter of the grinding wheel 10 and the driving of the Z-axis drive device 40 is controlled as described above, the grinding wheel is actually used. 10 is worn. And if this wear becomes enormous, high dimensional accuracy cannot be secured in the end face grinding.

  Therefore, in this example, grinding is performed by setting the rotation speed of the workpiece 20 and the cutting feed speed so that the feed amount in the Z-axis direction is 0.0001 to 0.02 mm. The feed amount in the Z-axis direction is a relative movement amount of the workpiece 20 and the grinding wheel 10 in the Z-axis direction per rotation of the workpiece 20, and the workpiece 20 and the grinding wheel 10 are in the Z-axis direction. In the case of relative movement in the two directions of the direction and the X-axis direction, only the Z-axis direction needs to be considered without taking into account the amount of movement in the X-axis direction. This is because the circumferential surface 13 of the grinding wheel 10 is worn in the X-axis direction, and this wear does not significantly change the size in the Z-axis direction.

  By setting the feed amount in the Z-axis direction in this way, it is possible to prevent the end face 14 of the grinding wheel 10 from being worn significantly, and the dimensional change in the Z-axis direction of the grinding wheel 10 is estimated as Z. Even if the drive of the shaft drive device 40 is controlled, no major problems occur.

  In addition, when a plurality of types of grinding processes having different processing qualities such as rough grinding and finish grinding are performed on the same part or different parts in one workpiece 20, the amount of feeding is reduced in low-quality grinding such as rough grinding. While a large amount is set to shorten the grinding time, in a high-quality grinding process such as finish grinding, the feed amount is set to be small and the end face 14 of the grinding wheel 10 is hardly worn, so that the Z-axis direction The estimated value of the dimensional change may be made closer to the actual value. Even in this case, it is preferable to keep the maximum feeding amount within the above-mentioned range.

  In addition, when a plurality of types of grinding processes having different processing qualities are performed on the same part or different parts of one workpiece 10, the grinding wheel 10 is not limited to the above, but in low-quality grinding such as rough grinding. While considering the change in the dimension of the end surface 14 in the Z-axis direction and not applying the grinding method according to the present invention, in the high-quality grinding such as finish grinding, the end surface 14 of the grinding wheel 10 The grinding method according to the present invention may be applied in consideration of a change in dimension in the Z-axis direction.

It is the schematic which shows the functional structure of the cylindrical grinding machine which concerns on this invention. It is the schematic which shows the conventional grinding method. In a grinding wheel, it is the schematic of the principal part which shows the state from which the dimension of a Z-axis direction changes with the change of an outer diameter dimension. In a grinding wheel, it is the schematic of the principal part which shows the state from which the dimension of a Z-axis direction changes with abrasion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Grinding wheel 11 Base 12 Grinding wheel 13 Circumferential surface 14 End surface (Whetstone end surface)
20 Work piece 21 Cylindrical part 22 Peripheral surface 23 Flange part 24 End face (work end face)
30 Drive control device (drive control means)
31 calculating part (end surface change amount calculation means)
40 Z-axis drive device 50 X-axis drive device 60 Sizing device

Claims (5)

By a cylindrical grinding machine using a grinding wheel having an end surface with a back taper, a peripheral surface of the cylindrical portion and an end surface of the flange portion in a workpiece having a cylindrical portion and a flange portion following the cylindrical portion. A grinding method for performing grinding,
The change in the Z-axis direction dimension at the end face of the grinding wheel is calculated from the change in the outer diameter of the grinding wheel, and the drive control in the Z-axis direction of the grinding wheel with respect to the workpiece is corrected based on the calculated value, A grinding method characterized by grinding an end face.   2. The grinding method according to claim 1, wherein in the Z-axis direction, the end surface is ground under a condition that a feed amount per rotation of the workpiece is 0.0001 to 0.02 mm. Grinding is performed on the peripheral surface of the cylindrical portion and the end surface of the flange portion in a workpiece having a cylindrical portion and a flange portion following the cylindrical portion, using a grinding wheel whose end surface has a back taper shape. A cylindrical grinding machine,
An end face change amount calculating means for calculating a change amount of a dimension in the Z-axis direction on the end face of the grinding wheel based on a change amount of an outer diameter dimension of the grinding wheel;
A cylindrical grinding machine comprising: drive control means for performing a correction based on a value calculated by the end face change amount calculating means to control the drive of the grinding wheel in the Z-axis direction with respect to the workpiece.   The cylindrical grinder according to claim 3, further comprising a sizing device for measuring an outer diameter of the cylindrical portion of the workpiece.   The cylindrical grinding machine according to claim 3 or 4, further comprising a truing amount measuring device that measures a truing amount on a peripheral surface of the grinding wheel.

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