JP2014195862A - Method for truing rotary grindstone and grinding machine for performing the truing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further reduce a difference in surface roughness between a conical surface on the side close to a workpiece rotating shaft and a conical surface on the side far from the workpiece rotating shaft, when grinding a conical surface of a workpiece, and thereby the workpiece can be machined more efficiently.SOLUTION: A method for truing a rotary grindstone is configured by truing the rotary grindstone for grinding a conical surface using a truer by bringing an outer circumferential surface of the rotary grindstone of a grinding machine into abutment with the conical surface of a workpiece, while rotating the workpiece having a conical surface to a workpiece rotating shaft around the workpiece rotating shaft. The outer circumferential surface of the rotary grindstone is subjected to truing while relatively moving the position of the truer to the rotary grindstone along the outer circumferential surface of the rotary grindstone, from the side of one end toward the other end side in the axial direction of the rotary grindstone on the outer circumferential surface of the rotary grindstone. In that case, the relative movement speed of the truer is configured such that the position of the outer circumferential surface of the rotary grindstone for grinding a large diameter part is slowed down more than the position of the outer circumferential surface of the rotary grindstone for grinding a small diameter part of the conical surface.

Description

  The present invention relates to a truing method for a rotating grindstone and a grinding machine employing the truing method.

  Conventionally, a grinding machine processes various shapes of workpieces. For example, as shown in FIG. 9, a shaft portion WA and a disc portion WB that protrudes in a bowl shape substantially at the center of the shaft portion WA and has at least one surface in the axial direction formed on a conical surface WC. There is a work W to have. Such a conical surface WC of the workpiece W is ground by rotating the workpiece W about the axis and bringing the disc-shaped rotary grindstone TA into contact with the conical surface WC.

  As shown in the figure, the rotary grindstone TA described above is a so-called angular grindstone TA whose outer peripheral grinding surface TA1 is inclined with respect to the grindstone rotation axis ZTA and has a length substantially equal to the width of the conical surface WC. The angular grindstone TA is attached to a grinding machine and rotated around the grindstone rotation axis ZTA by a driving force such as a motor. Then, the workpiece W is rotated around the workpiece rotation axis ZW by a separate drive source, and the grinding surface TA1 of the rotating angular grindstone TA is brought into contact with the conical surface WC for grinding.

  Here, when the conical surface WC of the workpiece W is ground, the conical surface WC1 closer to the workpiece rotation axis ZW and the conical surface WC2 farther from the workpiece rotation axis ZW are closer to the workpiece rotation axis ZW. The peripheral speed is fast. Thereby, the difference in the grinding removal amount is caused by the difference in the diameter of the workpiece W on the conical surface WC, and the finished finished surface roughness is different.

  Further, the angular grindstone TA has a shape in which the grinding surface TA1 is inclined with respect to the grindstone rotation axis ZTA, and thus has a large diameter portion TA3 having a relatively large outer diameter and a small diameter portion TA2 having a small diameter. Therefore, the grinding surface TA1 of the angular grindstone TA has a tendency that the number of abrasive grains arranged in the circumferential direction of the large diameter portion TA3 is relatively larger than the number of abrasive grains arranged in the circumferential direction of the small diameter portion TA2. . Therefore, the small-diameter portion TA2 of the grinding surface TA1 of the angular grindstone TA tends to increase the finished surface roughness after machining the workpiece W as the workpiece W is machined with a smaller number of abrasive grains than the large-diameter portion TA3. is there.

  Here, in the grinding of the conical surface WC of the workpiece W by the angular grindstone TA, the large-diameter portion TA3 of the angular grindstone TA abuts on the conical surface WC1 on the side close to the workpiece rotation axis ZW, and the cone on the side far from the workpiece rotation axis ZW. The small diameter portion TA2 of the angular grindstone TA comes into contact with the surface WC2. Therefore, the finished surface roughness of the finished conical surface WC of the workpiece W is combined with the influence caused by the difference in the peripheral speed of the workpiece W and the influence caused by the difference in the number of abrasive grains of the angular grindstone TA. The conical surface WC2 on the far side is rougher.

  Here, the technique described in Patent Document 1 uses a rotating grindstone having a grinding surface smaller than the width of the conical surface of the workpiece to move the rotating grindstone abutting on the conical surface along the generatrix of the conical surface. It is to be ground. At the time of grinding, an attempt is made to make the finished surface roughness of the conical surface within a desired intersection by changing the rotation speed of the workpiece.

JP 2004-345054 A

  However, with the technique in Patent Document 1, it takes time to process the conical surface and cannot be efficiently processed. Therefore, the inventor of the present application paid attention to a truing method of a rotating grindstone by a truer that shapes and sharpens the rotating grindstone.

  The present invention has been made in view of the above points, and the problem to be solved by the present invention is that when a conical surface of a workpiece is ground, a conical surface near the workpiece rotation axis, The conical surface on the side far from the rotation axis can reduce the difference in the finished surface roughness and can process the workpiece more efficiently.

In order to solve the above problems, the truing method for a rotating grindstone according to the present invention takes the following means.
First, the first invention of the present invention is such that the axial length of the rotating grindstone on the outer peripheral surface of the rotating grindstone is substantially equal to the length of the generatrix of the conical surface of the workpiece, whereby the rotating grindstone is placed on the conical surface. When grinding by bringing the outer peripheral surface into contact with each other, in a grinding machine that grinds without moving the rotary grindstone relatively in the generatrix direction of the conical surface, While rotating around the workpiece rotation axis, the outer grindstone of the grinder is brought into contact with the conical surface of the workpiece and the rotating grindstone for grinding the conical surface is trued using a truer. A truing method for a grindstone, wherein the position of the truer with respect to the rotating grindstone is aligned with the outer peripheral surface of the rotating grindstone from one end side to the other end side in the axial direction of the rotating grindstone on the outer peripheral surface of the rotating grindstone. When truing the outer peripheral surface of the rotating grindstone while relatively moving, than the relative movement speed of the truer when truing the position of the outer peripheral surface of the rotating grindstone for grinding the small diameter portion of the conical surface of the workpiece. The relative movement speed of the truer when slowing the position of the outer peripheral surface of the rotating grindstone that grinds the large diameter portion of the conical surface of the workpiece is slowed down.

  According to the first aspect of the present invention, the surface condition of the rotating grindstone can be changed by changing the relative movement speed of the truer during truing. In other words, the grinding surface of the rotating grindstone that grinds the conical surface farther from the workpiece rotation axis whose peripheral speed is faster than the grinding surface roughness of the grinding surface of the rotating grindstone that grinds the conical surface closer to the workpiece rotation axis whose peripheral speed is slow. The grinding surface roughness of the is relatively fine. Thereby, when the conical surface of the workpiece is ground, the difference in the finished surface roughness can be further reduced between the conical surface close to the work rotation axis and the conical surface far from the work rotation axis. In addition, when the axial length of the rotating grindstone on the outer peripheral surface of the rotating grindstone is substantially equal to the length of the generatrix of the conical surface of the workpiece, the outer grindstone of the rotating grindstone is brought into contact with the conical surface for grinding. Since it can grind without moving a rotary grindstone relatively in the generatrix direction of a conical surface, a work can be processed efficiently. Therefore, when the workpiece conical surface is ground, the difference in surface roughness between the conical surface near the workpiece rotation axis and the cone surface far from the workpiece rotation axis can be reduced, and more The workpiece can be processed efficiently.

  Further, a second invention of the present invention is the truing method for a rotating grindstone according to the first invention, wherein the workpiece is removed from a position of the outer peripheral surface of the rotating grindstone for grinding a small diameter portion of the conical surface of the work. Relative movement of the truer toward the position of the outer peripheral surface of the rotating grindstone that grinds the large-diameter portion of the conical surface and gradually slowing down the relative movement speed of the truer, or the large diameter of the conical surface of the workpiece And moving the truer relative to the position of the outer peripheral surface of the rotating grindstone for grinding the small-diameter portion of the conical surface of the workpiece from the position of the outer peripheral surface of the rotating grindstone for grinding the portion, and the relative movement speed of the truer To make it faster.

  According to the second aspect of the invention, by gradually changing the relative movement speed of the truer during truing, the grinding surface roughness of the rotating grindstone is gradually changed, and the conical surface of the workpiece is made a more uniform finished surface. It can be roughness.

  Next, a third invention of the present invention is a truing method for a rotating grindstone according to the first invention or the second invention, wherein the rotating grindstone is a cylindrical plain grindstone.

  According to the third aspect of the present invention, a difference in the number of abrasive grains arranged in the circumferential direction of the outer peripheral surface is unlikely to occur because the rotating grindstone is a cylindrical plain grindstone. Therefore, it is not necessary to consider the difference in the density of the abrasive grains, and by adjusting the grinding surface roughness of the grinding surface of the grindstone, it is possible to adjust the finished surface roughness of the conical surface of the workpiece. The conical surface can have a more uniform finished surface roughness.

  Next, a fourth invention of the present invention includes a rotary grindstone, a truer for truing the rotary grindstone, and a control means, and based on a command from the control means, the first to third inventions described above. It is a grinder which performs the truing method of any one of these.

  According to the fourth aspect of the present invention, when the conical surface of the workpiece is ground, the difference in the finished surface roughness between the conical surface near the workpiece rotation axis and the conical surface far from the workpiece rotation axis is further reduced. It is possible to obtain a grinding machine that can process the workpiece more efficiently.

  According to the present invention, when the conical surface of the workpiece is ground by taking the measures of the above invention, the difference in the finished surface roughness between the conical surface near the work rotation axis and the conical surface far from the work rotation axis. Can be made smaller and the workpiece can be processed more efficiently.

It is a top view of the grinding machine in this embodiment. It is sectional drawing of the workpiece | work in this embodiment. It is the top view which showed the position at the time of grinding of the rotating grindstone in this embodiment. It is the top view which showed the position at the time of the truing wheel in this embodiment truing. It is an enlarged plan view of the V section of FIG. FIG. 6 is an enlarged cross-sectional view of a rotating grindstone in a VI part of FIG. 5. It is the flowchart which showed the process sequence by the control means in this embodiment. It is the graph which showed the change of the relative movement speed of the truer at the time of truing in this embodiment. (A) is the example 1 of change of the relative movement speed of a truer. (B) is a change example 2 of the relative movement speed of the truer. (C) is the example 3 of change of the relative movement speed of a truer. It is the schematic which showed the example of the conventional grinding.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. In each figure, the X axis, the Y axis, and the Z axis are orthogonal to each other, the Y axis indicates a vertically upward direction, the Z axis indicates a workpiece rotation axis ZW direction that is a rotation axis of the workpiece W, and X The axis indicates the advancing / retreating direction of the swivel base 12.

  Next, the grinding machine 1 in this Embodiment is demonstrated using FIGS. 1st Embodiment is the grinding machine 1 which has arrange | positioned the plain grindstone TP (equivalent to a rotating grindstone) in the appropriate position on the turntable 12. FIG.

[Overall configuration of grinding machine 1 (FIG. 1)]
As shown in FIG. 1, a grinding machine 1 includes a base 10, a spindle table 11 that can reciprocate in the Z-axis direction on the base 10, and a swivel that can reciprocate in the X-axis direction on the base 10. 12, and the swivel base 12 can swivel about a swivel axis ZS parallel to the Y axis. In addition, about the control means (numerical controller etc.) which controls each movable body etc., illustration is abbreviate | omitted.
The spindle table 11 reciprocates in the Z-axis direction by a Z-axis drive motor 11M and a feed screw, and the control means outputs a control signal to the Z-axis drive motor 11M while detecting a signal from the position detection means 11E such as an encoder. Thus, the spindle table 11 is positioned in the Z-axis direction.
The swivel 12 is reciprocated in the X-axis direction by the X-axis drive motor 12M and a feed screw, and the control means outputs a control signal to the X-axis drive motor 12M while detecting a signal from the position detection means 12E such as an encoder. Then, the swivel base 12 is positioned in the X-axis direction.

On the spindle table 11, a headstock 20 having a center member 21 and a tailstock 30 having a center member 31 are placed. The center member 21 and the center member 31 rotate a workpiece parallel to the Z-axis direction. It is arranged on the axis ZW. The tailstock 30 is provided with a truing device 25 for truing the plain grindstone TP. (Note that the truing device 25 may be provided on the head stock 20 depending on the positional relationship of the plain grinding stones TP.)
The center member 21 is provided on the main shaft 22, and a drive motor (not shown) is provided on the main shaft 22, and the control means arbitrarily moves the main shaft 22 around the workpiece rotation axis ZW passing through the tip of the center member 21 at an arbitrary angular velocity. Can be rotated up to an angle of.
The center member 31 is provided on a tailstock shaft 32, and the tailstock shaft 32 is supported so as to be rotatable or non-rotatable.

The swivel base 12 is plate-shaped to make it smaller, and a swivel motor 13 is provided in the vicinity of the center of the swivel base 12 so as to protrude in the Y-axis direction. The control means outputs a control signal to the turning motor 13 while detecting a signal from the angle detecting means such as an encoder, and controls the turning angle of the turntable 12.
On the swivel base 12, a plain grindstone device 50 having a plain grindstone TP (corresponding to a rotating grindstone) is arranged so as to sandwich the swivel motor 13.
Note that the grindstone rotation axis ZTP, which is the rotation axis of the plain grindstone TP, is located in a plane orthogonal to the turning axis ZS.
The plain grindstone TP is attached to an end portion in one direction in the direction of the grindstone rotation axis ZTP (in FIG. 1, the plain grindstone TP is attached to the right end portion).
The plain grindstone TP is rotationally driven from the grindstone drive motor 50M via the belt 50B.
Further, the grinding machine 1 is provided with a coolant nozzle for supplying coolant in the vicinity of a contact point (grinding point) between the workpiece W and the plain grindstone TP, which is not shown.

As shown in FIG. 1, the plain grindstone TP has a grinding surface TP1 (corresponding to the outer peripheral surface of the rotating grindstone) parallel to the grindstone rotation axis ZTP and is formed in a cylindrical shape.
In the plain grindstone TP, the length in the axial direction of the grinding surface TP1 which is the outer peripheral surface thereof is substantially equal to the length of the generatrix WL (see FIG. 2) of the conical surface WC of the workpiece W.
As shown in FIG. 3, the grinding machine 1 is configured such that the position of the grinding surface TP <b> 1 of the plain grinding stone TP grinds the conical surface WC of the workpiece W (the grinding surface TP <b> 1 of the plain grinding stone TP is the conical surface of the workpiece W). The conical surface WC of the work W can be ground by turning the swivel base 12 so that the swivel base 12 is brought close to the work W so that the conical surface WC comes into contact with the WC.
Although illustration is omitted, the workpiece rotation axis ZW, the grindstone rotation axis ZTP, and the truer rotation axis ZTR of the truing device 25 are arranged on a relative movement plane orthogonal to the turning axis ZS.

[Overall configuration of work W (Fig. 2)]
As shown in FIG. 1, the workpiece W is supported at both ends (or near both ends) by the center member 21 and the center member 31 (a chuck may be used instead of the center member).
As shown in FIG. 2, the workpiece W includes a shaft portion WA, a disc portion WB that protrudes in a bowl shape substantially at the center of the shaft portion WA, and has at least one surface in the axial direction formed on a conical surface WC. Have. In the disc part WB, the small diameter part WBi is formed with a diameter Di continuously from the shaft part WA, and the large diameter part WBo is formed with a diameter Do by projecting continuously from the small diameter part WBi in a bowl shape. The conical surface WC is formed at an angle Wθ when viewed in cross section. Thus, the bus bar WL is formed on the conical surface WC of the workpiece W.

[Configuration of Truing Device 25 (FIGS. 1, 4, 5)]
The truing device 25 is for truing the plain grindstone TP as shown in FIG.
The truing device 25 includes a truer TR that is rotationally driven around a truer rotational axis ZTR parallel to the workpiece rotational axis ZW, and a drive motor (not shown) that rotationally drives the truer TR.
FIG. 4 shows a state in which the position of the truer TR with respect to the plain grindstone TP is turned and moved relatively to the truing start position A (see FIG. 5). That is, as shown in FIG. 5, the grinding machine 1 uses the swivel base 12 so that the grinding surface TP1 of the plain grindstone TP and the truer surface TR1 of the truer TR of the truing device 25 are located on substantially the same straight line. Swivel.
FIG. 5 is an enlarged view showing a state in which the plain grindstone TP is trued by the truer TR of the truing device 25. The truer TR is generally formed in a disc shape, and its outer peripheral surface is configured as a truer surface TR1.

Here, as a knowledge of a grindstone in a grinding machine, there is a correlation between a grinding allowance cross-sectional area and a finished surface roughness of a ground work surface of a workpiece (work W in this embodiment). That is, as the grinding allowance cross-sectional area increases, the finished surface roughness of the processed surface of the workpiece increases (roughens).
Further, as knowledge about the truing of the grindstone in the grinder, there is a relation that the finished surface roughness of the work surface of the workpiece machined by the grindstone truried with the truer increases as the moving speed of the truer with respect to the grindstone increases.
Based on these findings, the truing of the plain grindstone TP focuses on changing the speed of the truer TR.

[Processing procedure of truing method for plain grinding stone TP (Fig. 7)]
Next, an example of the processing procedure of the truing method of the plain grindstone TP by the control means will be described using the flowchart shown in FIG. The control means executes the processing shown in FIG. 7 when execution of truing is instructed or when a truing timing set in advance is reached.
In step S10, the control means relatively turns and moves (the position shown in FIG. 4) the truer TR with respect to the plain grindstone TP so that the position of the truer TR with respect to the plain grindstone TP becomes the truing start position A. Proceed to step S20.
In step S20, the control means sets an initial movement speed at a relative movement speed F of the truer TR with respect to the plain grindstone TP, and proceeds to step S30. For example, when the truing start position A shown in FIG. 5 is the side for grinding the small diameter portion WBi of the conical surface WC of the workpiece W (see FIG. 2), the initial moving speed is the side for grinding the large diameter portion WBo of the conical surface WC. When the moving speed is set relatively higher than the moving speed (see FIG. 2) and is on the side where the large diameter portion WBo of the conical surface WC of the workpiece W is ground (see FIG. 2), the initial moving speed is the conical surface WC. Is set to a relatively low speed compared to the moving speed on the side (see FIG. 2) for grinding the small-diameter portion WBi.

In step S30, the control means moves the relative position of the truer TR with respect to the plain grindstone TP at the set relative movement speed F to perform truing (the state shown in FIG. 5), and proceeds to step S40.
In step S40, the control means detects the relative position of the current truer TR with respect to the plain grindstone TP, and proceeds to step S50.
In step S50, the control means determines whether or not the relative position of the truer TR with respect to the plain grindstone TP has reached the truing end position B (see FIG. 5). When the truing end position B has been reached (Yes), the process proceeds to step S70, and when the truing end position B has not yet been reached (No), the process proceeds to step S60.

When it progresses to step S60, a control means sets the moving speed according to a position, returns to step S30, and repeats step S30 and subsequent steps. For example, in the case where the small diameter portion WBi of the conical surface WC of the workpiece W is moved from the grinding side to the grinding side of the large diameter portion WBo, the moving speed is gradually or stepwise decreased depending on the position. (Refer to (a) to (c) of FIG. 8), in the case where the large diameter portion WBo of the conical surface WC of the workpiece W is moved from the grinding side to the grinding side of the small diameter portion WBi, depending on the position. Increase the moving speed gradually or step by step.
When the process proceeds to step S70, the control means turns and moves the plain grindstone TP to the initial position (position shown in FIG. 1) (returns to the initial position), and ends the truing process.

  The change in the relative speed of the plain grindstone TP and the truing device 25 is changed gradually or stepwise. Here, it is more preferable that the relative speed F of the plain grindstone TP and the truing device 25 is sequentially changed according to the relative position of the truer TR with respect to the plain grindstone TP as shown in FIG. As shown in FIG. 8 (b), the relative position of the truer TR with respect to the plain grindstone TP may be changed stepwise every time it moves a certain distance, or it changes in two steps as shown in FIG. 8 (c). It may be allowed.

By applying the truing, the grinding surface TP1 of the plain grindstone TP becomes a surface state in which the protruding amount of the abrasive grains gradually changes as shown in FIG.
As shown in FIG. 6, the protrusion amount H of the abrasive grains TP2 on the grinding surface TP1 is large, and the protrusion amount HA on the side where the small diameter portion WBi of the conical surface WC of the workpiece W is ground is large, and the protrusion on the side where the large diameter portion WBo is ground. Truing is performed so that the amount HB becomes small. In this way, the grinding surface roughness is adjusted.

As described above, according to the truing method of the plain grindstone TP (rotary grindstone) and the grinder 1 for carrying out the truing method according to the present embodiment, the plane can be changed by changing the relative movement speed of the true TR during truing. The surface state of the grindstone TP can be changed. In other words, the workpiece rotation axis ZW has a higher peripheral speed than the grinding surface roughness of the grinding surface TP1 of the plain grindstone TP that grinds the conical surface WC on the side closer to the workpiece rotation axis ZW (the small diameter portion WBi side). The grinding surface roughness of the grinding surface TP1 of the plain grindstone TP that grinds the conical surface WC at the far side (large diameter portion WBo side) is made relatively fine. As a result, when the conical surface WC of the workpiece W is ground, the position of the conical surface WC closer to the workpiece rotation axis ZW (the small diameter portion WBi side) and the side of the conical surface WC farther from the workpiece rotation axis ZW. The difference in the finished surface roughness can be further reduced at the position (large diameter portion WBo side). Further, the length of the plain grindstone TP in the axial direction on the grinding surface TP1 (corresponding to the outer peripheral surface of the rotating grindstone) of the plain grindstone TP is made substantially equal to the length of the generatrix WL of the conical surface WC of the workpiece W. When grinding by bringing the outer peripheral surface of the plain grindstone TP into contact with the WC, it is possible to grind the workpiece W efficiently without moving the plain grindstone TP relatively in the direction of the generatrix WL WC. .
Also, by gradually changing the relative movement speed of the truer TR during truing, the grinding surface roughness of the plain grindstone TP is gradually changed, and the conical surface WC of the workpiece W is made to have a more uniform finished surface roughness. be able to.
Moreover, the difference in the number of abrasive grains arranged in the circumferential direction of the grinding surface TP1 is less likely to occur by using a cylindrical plain grinding stone TP as the grinding stone. Therefore, it is not necessary to consider the difference in density of the abrasive grains TP2, and the finished surface roughness of the conical surface WC of the workpiece W can be adjusted by adjusting the grinding surface roughness of the grinding surface TP1 of the plain grindstone TP. This is possible, and the conical surface WC of the workpiece W can be made to have a more uniform finished surface roughness.
Further, when the conical surface WC of the workpiece W is ground, the position on the conical surface WC closer to the work rotation axis ZW (small diameter portion WBi side) and the position on the conical surface WC farther from the work rotation axis ZW. On the (large diameter portion WBo side), it is possible to obtain a grinding machine 1 that can further reduce the difference in finished surface roughness and that can process the workpiece W more efficiently.

As mentioned above, although embodiment of this invention was described, the grinding machine for implementing the truing method of the rotary grindstone of this invention and its truing method is not limited to this embodiment, The range which does not deviate from the summary of this invention It can also be implemented in various forms.
For example, in the present embodiment, the truing method of the rotating grindstone has been described by exemplifying the plain grindstone TP. However, even an angular grindstone is applicable.
In the present embodiment, an example is shown in which the plain grindstone TP is movable with respect to the workpiece W in the X-axis direction and the workpiece W is movable with respect to the plain grindstone TP in the Z-axis direction. However, the plain grindstone TP may be moved relative to the workpiece W in the X-axis direction and the Z-axis direction (movable on the XZ plane (corresponding to the relative movement plane)).
Moreover, in the grinding machine 1 demonstrated in this embodiment, although the example provided with the plain grindstone TP on the turntable 12 was shown, it is not limited to this, A plain grindstone and an angular grindstone are put on an appropriate position on a turntable. It may be a combined grinding machine. According to this, it can grind also about various site | parts other than the conical surface of a workpiece | work.
In the grinding machine 1 described in the present embodiment, an example in which the method for supporting each grindstone is a cantilever type is shown, but the grindstone may be supported by a double-sided type.
Note that the shape and configuration of the grindstone and the shape of the workpiece W are not limited to those described in the present embodiment.

DESCRIPTION OF SYMBOLS 1 Grinding machine 10 Base 11 Spindle table 12 Swivel table 13 Swivel motor 11M Z-axis drive motor 11E Position detection means 12M X-axis drive motor 12E Position detection means 20 Spindle base 21 Center member 22 Spindle 25 Truing device 30 Tailstock 31 Center Member 32 Tailstock 50 Plain grinding wheel device 50B Belt TP Plain grinding wheel (Rotating grinding wheel)
TP1 grinding surface (outer peripheral surface of rotating wheel)
TP2 Abrasive grain H Protrusion amount HA Protrusion amount HB Protrusion amount W Workpiece WC Conical surface WA Shaft portion WB Disc portion WBi Small diameter portion WBo Large diameter portion WC Conical surface Di Diameter Do Diameter WL Busbar Wθ Angle ZS Rotating axis ZW Workpiece rotation axis ZW Wheel rotation axis ZTR Truer rotation axis TR Truer TR1 Truer surface F Relative movement speed A Truing start position B Truing end position

Claims (4)

When grinding with the outer peripheral surface of the rotating grindstone coming into contact with the conical surface by making the axial length of the outer surface of the rotating grindstone substantially equal to the length of the generatrix of the conical surface of the workpiece Is a grinding machine that performs grinding without relatively moving the rotating grindstone in the generatrix direction of the conical surface,
Grinding the conical surface by rotating the work having the conical surface around the work rotation axis around the work rotation axis while bringing the outer peripheral surface of the grinding wheel of the grinding machine into contact with the conical surface of the work A truing method for a rotating grindstone, wherein the rotating grindstone is trued using a truer.
While relatively moving the position of the truer relative to the rotating grindstone along the outer peripheral surface of the rotating grindstone from one end side to the other end side in the axial direction of the rotating grindstone on the outer peripheral surface of the rotating grindstone, When truing the outer peripheral surface of the rotating whetstone,
The outer periphery of the rotating grindstone that grinds the large diameter portion of the conical surface of the workpiece than the relative movement speed of the truer when the position of the outer peripheral surface of the rotating grindstone that grinds the small diameter portion of the conical surface of the workpiece is true. Slow down the relative movement speed of the truer when truing the surface position;
The truing method of a rotating whetstone. A truing method for a rotating grindstone according to claim 1,
Relative movement of the truer from the position of the outer peripheral surface of the rotating grindstone that grinds the small diameter portion of the conical surface of the work toward the position of the outer peripheral surface of the rotating grindstone that grinds the large diameter portion of the conical surface of the work And gradually reduce the relative movement speed of the truer.
Alternatively, from the position of the outer peripheral surface of the rotating grindstone that grinds the large diameter portion of the conical surface of the workpiece, toward the position of the outer peripheral surface of the rotating grindstone that grinds the small diameter portion of the conical surface of the workpiece, The relative movement speed is gradually increased while the relative movement speed is gradually increased.
The truing method of a rotating whetstone. A truing method for a rotating grindstone according to claim 1 or 2,
The rotating grindstone is a cylindrical plain grindstone,
The truing method of a rotating whetstone. A grinding machine having a rotary grindstone, a truer for truing the rotary grindstone, and a control means, and executing the truing method for the rotary grindstone according to any one of claims 1 to 3 based on a command from the control means.

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