JPH10118942A - Polishing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To grind a curved surface shape processing surface without changing the slant angle of a tool. SOLUTION: A columnar polishing tool is made by providing a coaxial rotary shaft 3 on a flexible columnar body and a cylindrical curved surface 4a of a work 4 fixed by a bottom surface 4b is ground in an arrow mark R direction while keeping the slant angle θ of the rotary shaft 3 to a constant in a state bent the columnar polishing tool 1. At the processing order positions of the arrow mark R direction (a), (b), (c), the bigness of bending of the columnar tool 2 is enlarged in order in order to make the slant angle to a constant. Meantime, the angle between the normal line of a processed surface 4a and the cylindrical surface of the columnar tool 2 at either processing point Mp of (a), (b), (c) is made to a right angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a polishing tool,
More specifically, a flexible columnar body that grinds a machined surface such as a mirror mold or a mirror surface in a state where the machined surface is in a sharpened state. For tools.

[0002]

2. Description of the Related Art Block gauges, lenses, prism reflecting mirrors, rotating mirrors, and the like are typical products which require submicron precision processing. Polishing is used for finishing of such products. In particular, a spherical or cylindrical polishing tool is used as a polishing tool used when polishing a curved surface such as a lens.

FIGS. 7A and 7B are views for explaining a conventional curved surface polishing tool. FIG. 7A is a sectional view of a cylindrical polishing tool in the direction of the rotation axis, and FIG. 7B is a spherical polishing tool. It is a sectional view of the polishing tool in the rotation axis direction, in which 20 is a processing surface, 21 is a cylindrical polishing tool, 22 is a cylindrical surface, 23 is a rotating shaft, 24 is a spherical polishing tool, 25 is a spherical surface, and 26 is It is a rotation axis.

A cylindrical polishing tool 21 shown in FIG. 7 has a coaxial rotary shaft 23, and a spherical polishing tool 24 has a rotary shaft 26. The rotary shafts 23, 26 are each formed at a predetermined angle θ with respect to the processing surface 20. with an angle mounted on the grinding machine (not shown), polishing machining point M _p is performed while rotating in an arrow ω direction. Such abrasive tools, rather than the state of point contact machining point M _p, as shown, is locally processed surface 20 and the surface contact is elastically deformed at the processing point M _p. In the polishing process, a columnar polishing tool 21
Alternatively, the spherical polishing tool 24 is moved while maintaining a constant angle θ and distance relationship with the processing surface 20.

[0005]

If the processing surface 20 is flat, the rotating shafts 23 and 26 are maintained at an angle θ with respect to the processing surface 20 as described above, and the polishing tool is rotated at a constant rotation speed. Polishing may be performed while rotating, but when the processing surface 20 is a curved surface, the following problem occurs. FIG.
In the case of the cylindrical polishing tool 21 shown in (A), the polishing is performed while maintaining the angle θ with respect to the surface at the processing point M _p of the processing curved surface. It must be changed according to the shape, and the driving mechanism of the grinding machine becomes complicated. In the case of spherical polishing tool 24 shown in FIG. 7 (B), changing the angle θ according to a machining curved surfaces, the radius of rotation T _r of the spherical abrasive tool 24 corresponding to the working point M _p is changed. That is, the axial direction L-
There is a problem that the position M corresponding to the rotation radius _Tr on L moves, the tool speed _Vr at the processing point _Mp also changes, and the accuracy of the processing surface becomes non-uniform.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a simple grinding mechanism in which a tool angle θ is always kept constant even when a processing surface is a curved surface, and a tool speed _Vr is also kept constant. It is an object of the present invention to provide a polishing tool capable of performing uniform polishing with uniform surface accuracy.

[0007]

According to a first aspect of the present invention, there is provided a cylindrical body having flexibility, a rotating shaft extending in an axial direction at one end of the cylindrical body, and a cylindrical surface of the cylindrical body being polished. A polishing tool for performing processing, wherein the cylindrical surface is pressed against a processing surface, the polishing tool is rotated around the rotation axis in a state where the polishing tool is in a state of being polished, and polishing is performed. Also in the polishing process, the angle of the tool rolling axis with respect to the workpiece fixing table is kept constant, and the tool speed is kept constant.

According to a second aspect of the present invention, in the polishing tool according to the first aspect, when the polishing tool presses the polishing tool against a processing surface and causes the polishing tool to perform the processing, the processing of the processing surface is performed. In this respect, a normal line of the processing surface and the cylindrical surface of the polishing tool are perpendicular to each other, so that high-precision polishing can be performed.

According to a third aspect of the present invention, in the polishing tool according to the first aspect, the rotating shaft is provided with irregularities on the cylindrical surface of the polishing tool in a circumferential direction perpendicular to the rotating axis of the polishing tool. It is characterized in that parallel concave grooves are formed, so that the abrasive is placed in a concave portion provided in the cylindrical surface of the tool, and the abrasive is spread to the processing point to increase the processing efficiency.

According to a fourth aspect of the present invention, in the polishing tool according to the third aspect, an interval between the concave portion and the convex portion of the unevenness is changed to be a roughing or finishing interval, and the polishing tool is roughened. The present invention is characterized in that it is specialized for processing or finish processing, so that effective polishing tools can be separately produced.

According to a fifth aspect of the present invention, in the polishing tool according to the third aspect, the height and hardness of the projections of the unevenness are changed, and the contact state between the polishing tool and a processing surface is changed by a tool pressure. Therefore, the polishing state can be controlled by the tool pressure, and the usage can be optimized.

According to a sixth aspect of the present invention, there is provided a flexible conical body having a rotation axis extending in the axial direction on the apex side of the conical body, and polishing the conical surface of the conical body. A polishing tool to be applied, wherein the polishing tool is rotated around the rotation axis in a state where the conical surface is pressed against a processing surface and the polishing tool is in an inflected state, and polishing is performed. On the other hand, grooves with different groove radii can be efficiently processed.

According to a seventh aspect of the present invention, in the polishing tool according to the sixth aspect, when the polishing tool is pressed against a processing surface and the polishing tool is bent, the processing point of the processing surface is reduced. Wherein the normal line of the processing surface and the conical surface of the polishing tool are perpendicular to each other, whereby the angle of the tool rotation axis with respect to the work fixing table is kept constant to enable high-precision polishing. It is.

The invention according to claim 8 is the polishing tool according to claim 6, wherein the conical surface of the polishing tool has irregularities in a circumferential direction perpendicular to the rotation axis of the polishing tool. It is characterized by forming a concave groove extending to
An abrasive is placed in a concave portion provided on the cylindrical surface of the tool, and the abrasive is spread to a processing point to increase the processing efficiency.

According to a ninth aspect of the present invention, in the polishing tool according to the eighth aspect, an interval between the concave portion and the convex portion of the unevenness is changed to be an interval for rough machining or finish machining, and the polishing tool is roughened. The present invention is characterized in that it is specialized for processing or finish processing, so that effective polishing tools can be separately produced.

According to a tenth aspect of the present invention, in the polishing tool according to the eighth aspect, the height and hardness of the projections of the irregularities are changed, and the contact state between the polishing tool and the processing surface is changed by a tool pressure. Therefore, the polishing state can be controlled by the tool pressure, and the usage can be optimized.

According to an eleventh aspect of the present invention, in the polishing tool according to the sixth aspect, the radius at each position in the axial direction of the polishing tool is determined according to the radius of the workpiece, and the radius changes in the length direction. It is characterized by polishing the workpiece,
This enables efficient polishing of a workpiece whose groove radius changes in the longitudinal direction.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiments of the first and second aspects of the invention)
A cylindrically-shaped polishing tool that is elastically deformed, the cylindrical surface of the polishing tool is pressed against a processing surface, and the polishing tool is configured to perform polishing on the cylindrical surface in a state where the polishing tool is in an ablated state. An optimum relationship between a processing point and a posture of the polishing tool when the polishing tool according to the first aspect is subjected to polishing is determined.

FIG. 1 is a perspective view of a polishing tool for explaining an embodiment of the first aspect of the present invention, in which 1 is a cylindrical polishing tool, 2 is a cylindrical surface, and 3 is a rotating shaft.

The cylindrical polishing tool 1 has a flexible cylindrical shape around an OO line, and has a rotating shaft 3 coaxially provided at one end. As shown in the drawing, when a pressure is applied in a direction perpendicular to the axis OO line, the cylindrical polishing tool 1 is elastically deformed and curved in the pressing direction, and accordingly, the axis OO line is also curved. . The cylindrical surface 2 of the cylindrical polishing tool 1 is a surface for polishing a processing surface. By pressing the processing surface while rotating the rotary shaft 3, the polishing is performed in a state where the cylindrical polishing tool 1 is made to perform. Will be

FIG. 2 is a view for explaining polishing of a circular processing surface using the cylindrical polishing tool shown in FIG.
(A), (b), (c) are polishing positions of the cylindrical polishing tool 1,
Reference numeral 4 denotes a workpiece, 4a denotes a curved surface, and 4b denotes a bottom surface, and portions having the same functions as those in FIG. 1 are denoted by the same reference numerals as those in FIG.

The workpiece 4 shown in FIG. 2 is one in which the processing surface is a cylindrical curved surface 4a and is fixed at the bottom surface 4b. The cylindrical polishing tool 1 has a fixed angle with respect to the surface of the bottom surface 4b. with an inclination of theta, it is rotatably supported by the polishing machine (not shown) in the rotary shaft 3, with respect to the normal P-P of the curved surface 4a in the processing point M _p, as the cylindrical surface 2 is perpendicular While pressurizing, polishing is performed on the cylindrical surface 2 which is moved in the direction of arrow R in the order of (a), (b) and (c) and rotated by the rotation of the rotating shaft 3 in the direction of arrow ω.

For example, when the cylindrical polishing tool 1 is at the position (a), the axis of the cylindrical polishing tool 1 is coaxial with the rotation axis 3, and therefore, the cylindrical surface 2 has a normal P at the processing point _{Mpa. At} right angles to a. Next, at the position of the center (b) of the curved surface 4a,
Since the angle θ of the rotating shaft 3 is constant, the cylindrical polishing tool 1
The polishing is performed at the processing point M _pb of the curved surface 4 a that is in contact with the cylindrical surface 2. At this time, the cylindrical surface 2 and the normal line of the processing surface at the processing point M _pb are perpendicular to each other. In the case of the processing position (c) as well, as in the case of the processing position (b), the cylindrical polishing tool 1 is bent, but the normal of the processing surface at the processing point M _pc and the cylindrical surface 2 are at right angles. In any position, the processing surface and the cylindrical surface are in contact with each other on the same straight line, and are polished at a constant speed while being uniformly pressed.

(Inventions of claims 3 and 4) According to the invention of claim 3, a groove parallel to the rotating shaft 3 is provided on the cylindrical surface 2 of the cylindrical polishing tool 1, and an uneven portion having this groove as a recess is provided. According to the invention of claim 4, the width of the groove, that is, the width of the concave portion is changed so as to be specialized for roughing and finishing.

FIG. 3 is a view for explaining an embodiment of the third and fourth aspects of the present invention. FIG. 3 (A) is a side view of a cylindrical polishing tool, and FIG. 3 (B) is a view of FIG. 3 (A). In the arrow BB line sectional view,
In the figure, reference numeral 5 denotes a convex portion, and reference numeral 6 denotes a concave (groove) portion. Parts having the same functions as those in FIG. 1 are denoted by the same reference numerals as those in FIG.

The cylindrical polishing tool 1 shown in FIG.
Concave portions (grooves) 6 parallel to the rotating shaft 3 are provided at equal intervals to form convex portions 5, and polishing is performed on the cylindrical surface 2 that is the upper end surface of the convex portions 5. in, (not shown) abrasive used is because satisfying the recess 6, the abrasive is able to perform good polishing efficiency tends spreads to the machining point M _p of the processing surface 4a.

In FIG. 3, the interval between the convex portion 5 and the concave portion 6 on the cylindrical surface 2 is determined to be constant at an equal interval. However, the interval between the convex portion 5 and the concave portion 6 is changed, that is, By changing the width of the groove, the amount of the abrasive with respect to the width of the processing surface can be changed to change the amount of polishing so as to be used for roughing or for finishing.

(Invention of Claim 5) According to the invention of Claim 3, the unevenness parallel to the rotating shaft 3 is provided on the cylindrical surface 2 of the cylindrical polishing tool 1, By changing the height and hardness of the projections, the state of contact with the processing surface is changed according to the magnitude of the tool pressure.

FIG. 4 is a partial cross-sectional view of a polishing tool and a machined surface for explaining an embodiment of the present invention.
4A is a diagram when the tool pressure is a predetermined value, and FIG. 4B is a diagram when the tool pressure P is applied.
3 are provided with different heights, 5b is a low-hardness protrusion joined to the upper end of the protrusion 5a, 7 is a machined surface, and portions having the same action as in FIG. The same reference numbers are given.

The polishing tool shown in FIG. 4 changes the height of the convex and concave portions 5 parallel to the axis of the cylindrical polishing tool 1 formed on the surface of the cylindrical polishing tool 1 shown in FIG. Convex part 5a
And the high convex portions 5c are alternately formed in the circumferential direction.
A low-hardness convex portion 5b having a different hardness, for example, a small hardness is joined to an end portion of the low-height convex portion 5a, and the end portion thereof is higher than the high-height convex portion 5c. FIG.
In the case of the normal polishing tool pressure shown in (A), only the low-hard convex portion 5b is pressed against the cylindrical polishing tool 1 and the processing surface 7, and the convex portion 5c is separated and moves in the direction of arrow F to be polished. But,
In the case of FIG. 4B in which the tool pressure P is applied, the low hardness convex portion 5 b is compressed and deformed, and in addition to the low hardness convex portion 5,
c is also pressed against the processing surface 7. That is, the contact area with the processing surface can be changed according to the magnitude of the tool pressure (contact pressure).

(Inventions of Claims 6, 7, 8, 9, and 10) According to the invention of claim 6, the polishing tool has a conical shape in which both end faces are composed of a circle having a large diameter and a small diameter, and is elastically shaped. It is a polishing tool that deforms, a polishing tool that presses the conical surface of the polishing tool against a processing surface and performs polishing in a state where the polishing tool is in a state of being polished,
According to a seventh aspect of the present invention, the normal of the processing surface at the processing point is perpendicular to the conical surface of the polishing tool by bending the polishing tool. In the ninth aspect of the present invention, the unevenness in the direction parallel to the rotation axis is provided to enhance the efficiency of the polishing process. According to a tenth aspect of the present invention, the contact state of the polishing tool is changed by the tool pressure by changing the properties such as the height and hardness of the projection according to the eighth aspect of the invention.

FIG. 5 is a perspective view for explaining an embodiment of the invention of claim 6, in which 8 is a conical polishing tool, 9 is
Is a conical surface, and 10 is a rotation axis.

The conical polishing tool 8 is a conical flexible body having a large-diameter end face 8a and a small-diameter end face 8b around an OO line, and a coaxial rotary shaft 10 is provided on the small-diameter end face 8b side. Then, the conical surface 9 is pressed against the processing surface, and the polishing process is performed in a state where the conical surface 9 is bent.

FIG. 6 is a view for explaining an embodiment of the invention according to claim 7, wherein FIG. 6 (A) is a side view of a conical polishing tool 8, and FIG. 6 (B) sets a tool radius during polishing. 6 (C) is a perspective view of a workpiece suitable for machining with the conical polishing tool 8, in which 11 is a machining surface, and 12 has a semicircular groove 12a. The workpiece 13 is a machined surface, and portions having the same operation as in FIG. 5 are denoted by the same reference numerals as in FIG.

During polishing, the conical polishing tool 8 keeps the angle between the rotating shaft 10 and the processing surface 11 at a predetermined angle,
1 is pressed to make it in a state where it is made to be in a state of being bent. Here, when 9a a conical surface at the machining point M _p of the processing surface 11, becomes perpendicular to the normal line Y-Y and the conical surface 9a of the processing surface 11, the radius of the conical grinding tool 8 at the 7 Ri position T _r .

Next, the cylindrical polishing tool 1 shown in FIG.
A groove is formed in the direction parallel to the axis of the conical polishing tool 8 in the direction parallel to the axis, similarly to the case where the groove is provided in the direction parallel to the (Not shown), the abrasive material is accommodated in the concave portion,
This abrasive material is transported to the processing point M _p, efficient processing is performed. Further, by changing the interval between the convex and concave portions of the concavo-convex provided on the conical surface 9, it can be specified for roughing and finishing. Furthermore, by changing the properties such as the height and hardness of the projections, it is possible to perform polishing by changing the tool pressure to change the contact area of the conical polishing tool 8 with the processing surface 11.

The conical polishing tool 8 thus configured is suitable for polishing the semicircular groove 12a of the workpiece 12 having the semicircular groove 12a shown in FIG. In particular, it is suitable for use in the case of a workpiece in which the semicircular groove 12a extends in the length direction of the workpiece and the groove radius changes in the length direction.

(Invention of Claim 11) The invention of Claim 11 uses the conical polishing tool 8 to improve the efficiency when the radius of the semicircular groove 12a shown in FIG. It is designed to be polished well.

As shown in FIG. 6 (C), the workpiece radius W _r of the workpiece 12 having a semicircular groove 12a is changed in the length direction of the axis _{Q-Q W p '≠ W} p ≠ W p ”, Work 1
Think any of the processing point M _p on the 2. The radius of the conical grinding tool 8 at this processing point M _p T _r, the radius of the workpiece 12 W _r
When, by the W _r = T _r by Shinara a conical grinding tool 8 efficiently polishing can be performed. Also at other processing points M _p ′ and M _p ″ of the workpiece 12, when an amount is selected and the workpiece radius W _r ′ of the processing point M _{p ′} is obtained, W _r ′ = T _r ′.
, And a work piece radius W _r ″ of the work point M _p ″,
By setting W _r ″ = T _r ″, the processing surface 1 of the workpiece 12
Polishing can be efficiently performed over the entire surface of 2a.

[0040]

【The invention's effect】

An effect corresponding to claim 1 is a polishing tool which is a flexible cylindrical body, has a rotating shaft extending in one axial direction at one end of the cylindrical body, and performs a polishing process on a cylindrical surface of the cylindrical body. The cylindrical surface is pressed against the processing surface, and the polishing tool is rotated around the rotation axis in a state where the polishing tool is bent, so that the polishing process is performed, so that the polishing is performed without changing the inclination angle θ of the polishing tool. Processing can be performed.

According to a second aspect of the present invention, in the polishing tool according to the first aspect, the polishing tool presses the polishing tool against a processing surface, and when the polishing tool is disengaged, the polishing tool has At the processing point, the normal line of the processing surface and the cylindrical surface of the polishing tool are perpendicular to each other, so that the effect of claim 1 can be further ensured, and highly accurate polishing can be performed.

According to a third aspect of the present invention, in the polishing tool according to the first aspect, on the cylindrical surface of the polishing tool,
Since a concave groove is formed in the circumferential direction perpendicular to the rotation axis of the polishing tool in a circumferential direction perpendicular to the rotation axis, the abrasive is housed in the recess and easily spreads to the processing point, so that the efficiency of the polishing processing is improved. be able to.

According to a fourth aspect of the present invention, in the polishing tool according to the third aspect, the distance between the concave and convex portions of the unevenness is changed to be a rough working or finish working distance, and the polishing tool is used. Since it is specialized for rough machining or finish machining, it is possible to separately produce effective polishing tools for rough machining and finish machining.

According to a fifth aspect of the present invention, in the polishing tool according to the third aspect, the height and hardness of the projections of the unevenness are changed, and the contact state between the polishing tool and the processing surface is changed by the tool pressure. Therefore, it is possible to optimize the application and control the polishing state by the tool pressure.

According to a sixth aspect of the present invention, a conical body having flexibility, a rotating shaft extending in the axial direction at a vertex side of the conical body, and polishing processing performed on a conical surface of the conical body. The polishing tool performs a polishing process by rotating around the rotation axis in a state where the conical surface is pressed against the processing surface and the polishing tool is in a state of being polished, thereby performing a polishing process. Polishing can be performed efficiently.

According to a seventh aspect of the present invention, in the polishing tool according to the sixth aspect, when the polishing tool presses the polishing tool against a processing surface and causes the polishing tool to perform the processing, the processing of the processing surface is performed. At this point, since the normal line of the processing surface and the conical surface of the polishing tool are at right angles, it is possible to perform processing while maintaining the angle of the rotation axis constant, and to perform polishing with high precision. .

According to the eighth aspect of the present invention, in the polishing tool according to the sixth aspect, on the conical surface of the polishing tool,
Since the recessed groove extending in the direction of the rotation axis is formed in the circumferential direction perpendicular to the rotation axis of the polishing tool so as to be uneven in the circumferential direction, the polishing material is housed in the recess and easily spread to the processing point, thereby improving the efficiency of the polishing process. be able to.

According to a ninth aspect of the present invention, in the polishing tool according to the eighth aspect, an interval between the concave and convex portions of the unevenness is changed to be a roughing or finishing interval, and the polishing tool is used. Since it is possible to specialize for roughing or finishing, it is possible to separately produce effective polishing tools for roughing and finishing.

According to the tenth aspect, in the polishing tool according to the eighth aspect, the height and hardness of the projections of the irregularities are changed, and the contact state between the polishing tool and the processing surface is changed by the tool pressure. As a result, it is possible to optimize the application and control the polishing state by the tool pressure.

According to the eleventh aspect, in the polishing tool according to the sixth aspect, the radius at each position in the axial direction of the polishing tool is determined according to the radius of the workpiece, and the radius changes in the length direction. Since the workpiece to be polished is polished, the workpiece can be polished efficiently such that the groove radius changes in the longitudinal direction of the workpiece.

[Brief description of the drawings]

FIG. 1 is a perspective view of a polishing tool for explaining an embodiment of the present invention.

FIG. 2 is a view for explaining polishing of a circular processing surface using the cylindrical polishing tool shown in FIG. 1;

FIG. 3 is a diagram for explaining an embodiment of the third and fourth aspects of the present invention;

FIG. 4 is a partial sectional view of a polishing tool and a processing surface for explaining an embodiment of the invention of claim 5;

FIG. 5 is a perspective view for explaining an embodiment of the invention of claim 6;

FIG. 6 is a diagram for explaining an embodiment of the invention of claim 7;

FIG. 7 is a view for explaining a conventional curved surface polishing tool.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylindrical polishing tool, 2 ... Cylindrical surface, 3 ... Rotation axis, 4 ... Workpiece, 4a ... Cylindrical processing surface, 5 ... Convex part, 5a, 5c ... Convex part with different height of cylindrical surface 2, 5b ... Convex Low hardness convex portion joined to the upper end of the portion 5a, 6 ... concave (groove) portion, 7 ... processing surface, 8 ... conical polishing tool, 9 ... conical surface, 10 ... rotating shaft, 11 ... processing surface,
12: Workpiece having semicircular groove 12a, 13: Work surface,
(A), (b), (c)... Polishing position of the cylindrical polishing tool 1.

Claims (11)

[Claims] 1. A polishing tool comprising: a flexible cylindrical body having an axially extending rotation axis at one end of the cylindrical body, and performing a grinding process on a cylindrical surface of the cylindrical body; A polishing tool which is pressed against a processing surface to rotate around the rotation axis in a state where the polishing tool is in a state of being polished to perform polishing. 2. The polishing tool presses the polishing tool against a processing surface, and when the polishing tool is bent, at a processing point of the processing surface, a normal line of the processing surface and the polishing tool. The polishing tool according to claim 1, wherein the cylindrical surface is a right angle. 3. The polishing tool according to claim 1, wherein a concave groove parallel to the rotation axis is formed on the cylindrical surface of the polishing tool in a circumferential direction perpendicular to the rotation axis of the polishing tool. A polishing tool according to item 1. 4. The polishing tool is specialized for roughing or finishing by changing an interval between a concave portion and a convex portion of the unevenness to set a spacing for roughing or finishing. The polishing tool according to claim 3. 5. The polishing tool according to claim 3, wherein a height and a hardness of the projections of the irregularities are changed, and a contact state between the polishing tool and a processing surface is changed by a tool pressure. 6. A polishing tool which is a flexible conical body, has a rotating shaft extending in the axial direction on the vertex side of the conical body, and performs polishing on a conical surface of the conical body. A polishing tool that rotates around the rotation axis in a state in which the conical surface is pressed against a processing surface and the polishing tool is bent to perform polishing. 7. The polishing tool, when the polishing tool is pressed against a processing surface and the polishing tool is bent, at a processing point of the processing surface, a normal line of the processing surface and the cone of the polishing tool. The polishing tool according to claim 6, wherein the surface is at a right angle. 8. The polishing tool according to claim 6, wherein a concave groove is formed on the conical surface of the polishing tool so as to be uneven in a circumferential direction perpendicular to the rotation axis of the polishing tool and extend in the direction of the rotation axis.
A polishing tool according to item 1. 9. The polishing tool is specialized for roughing or finishing by changing the distance between the concave and convex portions of the unevenness to a spacing for roughing or finishing. The polishing tool according to claim 8. 10. The polishing tool according to claim 8, wherein a height and a hardness of the projections of the irregularities are changed, and a contact state between the polishing tool and a processing surface is changed by a tool pressure. 11. The polishing tool according to claim 6, wherein a radius at each position in the axial direction of the polishing tool is determined according to a radius of the workpiece, and the workpiece whose radius changes in the length direction is polished.
A polishing tool according to item 1.