JP2003025132A - Pin mirror cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pin mirror cutter capable of improving the rigidity in the fitting between a cutter body and an adapter and implementing highly precise machining. SOLUTION: The adapter 1 is formed with multiple adapter-side ribs 14 in its internal circumferential part and the cutter body 2 is formed with multiple body-side chamfer parts 24 corresponding to the adapter-side ribs 14 in its outer circumferential part. The cutter body 2 is formed with multiple body-side ribs 23 in its outer circumferential part and the adapter 1 is formed with multiple adapter-side chamfer parts 13 corresponding to the multiple body-side ribs 23 in its internal circumferential part. This cutter is constituted by fitting them mutually.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin mirror cutter for processing a crankshaft used in a reciprocating engine.

[0002]

2. Description of the Related Art Conventionally, for example, a pin mirror cutter as shown in FIG. 7 is known as a tool for machining a crankshaft of a reciprocating engine. FIG. 7 is a plan view (half of one side is not shown) for explaining the configuration of the conventional pin mirror cutter. The cutting blades arranged on the inner peripheral portion of the cutter body 51 are omitted in the drawing. In addition, FIG.
FIG. 8 shows a cross-sectional view taken along the line FF of FIG. 7. An annular cutter body 51 forming the pin mirror cutter includes a plurality of cutting blades (see FIG. 1) fixed to the inner peripheral portion of the cutter body 51 in a state of protruding from the inner peripheral surface. Also,
The cutter body 51 is fitted into an adapter 52 for mounting on a processing machine described later, and a pin mirror cutter is formed with this configuration.

As shown in FIG. 9, the cutter body 51 is attached to an adapter 52 previously attached to the processing machine 50 with its axis aligned with the main axis (not shown). A crankshaft (not shown), which is a workpiece to be fixed by penetrating the inner space of the pin mirror cutter, is bridged between the chucks 55 and 56 provided in the processing machine 50.

The cutter body 51 attached to the adapter 52 is rotated around its own axis by a main shaft in a fixed direction (see FIG. 7).
(In the direction of arrow R), and is appropriately moved in the axial direction while revolving with respect to the fixedly held crankshaft. As a result, the crankshaft is processed into a predetermined shape by the cutting edge of the pin mirror cutter.

By the way, in the method of machining a crankshaft using a pin mirror cutter, the concentricity between the axis of the cutter body 51 and the rotation axis of the main shaft of the machine 50 greatly affects the machining accuracy. Further, the rigidity of the attachment between the cutter body 51 and the adapter 52 also has a great influence.

For this reason, in the pin mirror cutter, as shown in FIG. 8, an annular stepped portion P (stepped shape) coaxial with the main shaft is formed on the inner peripheral portion of the adapter 52, and at the same time, the cutter main body 51 is provided. An annular stepped portion Q (stepped shape) is also formed on the outer peripheral portion, and these are fitted to each other. The shape of these stepped portions P and Q is the cutter body 5
1 and the thickness t of the adapter 52 are approximately half the thickness t
It has stepped surfaces 53 and 54 which are 1 and t2.

Further, in FIG. 7, four key grooves 57a facing the center side are formed on the inner wall surface of the adapter 52, and further four key grooves 57b oriented in the same direction as these are formed in the cutter body. It is also formed on the 51 side. The key material 57 is fitted into each of the key grooves 57a and 57b. It should be noted that in FIG. 7, only one half is shown and therefore only two are shown.

Each of the key members 57 has a substantially rectangular parallelepiped shape, and is arranged in the cross direction at 90 ° intervals along the circumferential direction on the adapter 52 side in the plan view of the pin mirror cutter of FIG. To be done. Further, the key members 57 are fitted into the key grooves 57a and 57b in a state where they are accurately positioned so that the widthwise center lines G intersect at the radial center, and are fixed by the bolts 57c.

On the outer peripheral portion of the cutter body 51, a key groove 57 having a rectangular cross section with the same width as the key material 57 is formed.
b is formed in the same arrangement as the key member 57, and by fitting the key groove 57a to these key members 57, the cutter body 51 with respect to both stepped portions P and Q (see FIG. 8) of the adapter 52 is formed. The radial movement of is constrained to increase the coaxiality.

When the cutter body 51 is attached to the adapter 52, the stepped portion P of the cutter body 51 is fitted into the stepped portion Q of the adapter 52, and the four key grooves 57b are respectively attached to the key members 57. By mating,
The cutter body 51 is mounted so that the axis of the cutter body 51 coincides with the axis of the adapter 52.

Further, a substantially half-moon shaped concave portion 58b is formed on the outer peripheral portion of the cutter body 51, and a substantially half-moon shaped concave portion 58a is formed on the inner peripheral portion of the adapter 52, and these substantially half-moon shaped concave portions 58a and 58b are combined. To form a circular recess 58. A clamper 59 having a substantially half-moon shaped notch is rotatably attached to the circular recess 58, and by rotating this, the cutter body 51 is firmly fixed to the adapter 52, and the pin mirror cutter processing machine 50 is mounted. Installation is completed.

The conventional pin mirror cutter described above is
This is a so-called internal type pin mirror cutter having a cutting blade on the inner peripheral portion of the cutter body 51, but with a cutting blade on the outer peripheral portion of the cutter body and the inner peripheral portion of the cutter body mounted on the outer peripheral portion of the adapter. There is also a so-called external type pin mirror cutter.

[0013]

By the way, if the attachment of the cutter body 51 and the adapter 52 in the pin mirror cutter has the above-described structure, the rigidity of the engagement is lowered. This occurs because the thickness dimensions of the cutter body 51 and the adapter 52 in the stepped portions P and Q are restricted. That is, the dimension of the stepped portion is about half of the total thickness t, that is, t1 and t2, which means that the rigidity of this portion decreases. Especially, when the total thickness t is small, this tendency is further promoted.

Further, when the attachment / detachment / replacement work of the cutter body 51 is repeatedly performed for a long period of time, the key groove 5
7a, 57b and the key material 57 may be worn or thermally deformed,
Rattling may occur between the two. This is because the rotational torque is transmitted only by the key material 57.

In such a case, the coaxiality between the cutter body 51 and the adapter 52 is lowered, and the workpiece cannot be machined with high precision, and also the torque transmission force from the adapter 52 to the cutter body 51 is lowered. .

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a pin mirror cutter capable of performing high-precision machining by increasing the rigidity in fitting the cutter body and the adapter. To do.

[0017]

In order to solve the above problems, the present invention adopts the following means. In the pin mirror cutter according to claim 1, a cutter body, which has an annular shape and in which cutting edges are arranged on an inner peripheral portion, is mounted in a fitted state on an inner peripheral portion of an adapter that is driven to rotate of a processing machine. In a pin mirror cutter that performs cutting with the cutting edge by integrally rotating these around an axis, the outer peripheral portion of the cutter body and the inner peripheral portion of the adapter have stepped shapes facing each other, and the adapter At least one of the inner peripheral portion and the outer peripheral portion of the cutter body is provided with a rib along the circumferential direction, and the other is provided with a chamfered portion facing the rib.

According to this structure, the chamfered portion is formed on the stepped convex portion formed on the outer peripheral portion of the cutter body, and the rib is formed on the stepped concave portion formed on the inner peripheral portion of the adapter. It is formed. Further, a rib is formed in a stepped concave portion formed on the outer peripheral portion of the cutter body, and a chamfered portion is formed on a stepped convex portion formed on the inner peripheral portion of the adapter. The formed chamfered portion and the rib formed in a shape facing the chamfered portion are fitted to each other, and the cutter body is attached to the adapter. The rib shape enhances the rigidity of the stepped shape. Of course, these chamfered portions and ribs may be provided on only one side or both sides. The chamfered portion is formed by chamfering a stepped convex portion over a certain range, or is formed by casting, forging, machining or the like so as to have the shape of the chamfered portion in advance. Further, it is preferable that the rib is formed in advance so as to have this shape. When processing a crankshaft or the like, the rotation torque may be transmitted from the adapter to the cutter body by fitting these ribs and the chamfered portions.

According to a second aspect of the present invention, in the pin mirror cutter, a cutter body having an annular shape and having cutting edges arranged on the outer peripheral portion is mounted in a fitted state on the outer peripheral portion of an adapter which is rotationally driven by the processing machine. , In a pin mirror cutter that performs cutting with the cutting edge by integrally rotating these around an axis, the inner peripheral portion of the cutter body and the outer peripheral portion of the adapter have stepped shapes facing each other, At least one of the outer peripheral part of the adapter and the inner peripheral part of the cutter body,
The ribs are formed along the circumferential direction, and the chamfered portion facing the ribs is formed on the other side.

According to this structure, in the so-called external type pin mirror cutter having the cutting edge provided on the outer peripheral portion of the cutter body, the stepped convex portion formed on the inner peripheral portion of the cutter body is used. A chamfer is formed, and a rib is formed in a stepped recess formed in the outer peripheral portion of the adapter. Further, a rib is formed in a stepped concave portion formed on the inner peripheral portion of the cutter body, and a chamfered portion is formed on a stepped convex portion formed on the outer peripheral portion of the adapter. The formed chamfered portion and the rib formed in a shape facing the chamfered portion are fitted to each other, and the cutter body is attached to the adapter. The rib shape enhances the rigidity of the stepped shape. Of course, these chamfered portions and ribs may be provided on only one side or both sides.
The chamfered portion is formed by chamfering a stepped convex portion over a certain range, or is formed by casting, forging, machining, or the like so as to have the shape of the main body side chamfered portion in advance. Further, it is preferable that the rib is formed in advance so as to have this shape. At the time of processing, the rotation torque may be transmitted from the adapter to the cutter body by fitting the chamfered portion and the rib.

The pin mirror cutter according to claim 3 is the pin mirror cutter according to claim 1 or 2.
A plurality of ribs and chamfers are formed.

With this configuration, the stepped shape of the peripheral portion on the side where the cutter body and the adapter are fitted to each other is
A plurality of chamfers or ribs facing the chamfers are formed at certain intervals. It is desirable that these chamfered portions and ribs are alternately arranged at a constant interval. The shape of these ribs increases the rigidity of both step shapes over the entire circumference. Further, the cutter body and the adapter are fitted to each other at the plurality of ribs or chamfers described above,
In these fittings, the rotation torque may be transmitted from the adapter to the cutter body.

A pin mirror cutter according to a fourth aspect is the pin mirror cutter according to any of the first to third aspects, wherein the peripheral portion of the adapter on the side where the cutter body is fitted is substantially rectangular. At least three or more key grooves are formed along the circumferential direction, and a key material having a chamfered end is fitted into each of the key grooves, and further, the circumference of the cutter body in contact with each of the key grooves. A chamfered portion for key material is formed in the portion.

With this structure, the chamfer formed on the key material and the sliding action of the chamfer portion for the key material in contact therewith, that is, the axis of the cutter body is guided to the axis of the adapter. This makes it possible to align the axis of the cutter body with the axis of the adapter. This action is performed by providing three or more key members, and of course, more key members may be provided. Also, by fitting the key material and the chamfer for the key material,
The rotation torque may be transmitted to the cutter body.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view (one side half is not shown) for explaining the overall configuration of the pin mirror cutter of the present embodiment, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a line BB of FIG. FIG. 4 is a sectional view taken along the line CC of FIG. 1, FIG. 5 is a sectional view taken along the line DD of FIG. 1, and FIG. 6 is a sectional view taken along the line EE of FIG.

As shown in FIGS. 1 to 6, the cutter body 2 has a substantially annular shape, and an outer peripheral portion thereof has a stepped portion J (stepped shape). A tip 2b having a cutting edge 2a is fixed to the inner peripheral portion via a bolt 2c. The other adapter 1 also has a substantially annular shape, and the inner peripheral portion thereof has a stepped portion K (stepped shape). The stepped portion K has a shape capable of surface contact with the stepped portion J of the cutter body 2.

The outer peripheral portion of the cutter body 2 and the inner peripheral portion of the adapter 1 are provided with a substantially circular concave clamper groove 3a formed so as to straddle these, and the clamper groove 3a has a substantially half-moon shaped cutout. The clamper 3 is rotatably attached. The cutter body 2 is firmly fixed to the adapter 1 by rotating the clamper 3.

Further, on the inner peripheral portion of the adapter 1, four key grooves 4a are formed as concave grooves opening in the central direction so as to be arranged in a cross direction (that is, at intervals of 90 °) in a plan view. Only two keyways 4a are shown in FIG. Further, a chamfered portion 25 for key material shown in FIG. 5 is formed on the outer peripheral portion of the cutter body 2 so as to face these. This chamfered shape is formed in conformity with the end chamfered shape of the key member 4 described later.

The key member 4 is fixed by being seated in the key groove 4a by inserting a bolt 5 into a hole (not shown) formed through the surface of the key member. The bolt 5 is, for example, 2
The key material 4 is fixed by setting at least this number.

The fitting shape of the cutter body 2 and the adapter 1 is a portion shown by two solid lines L1 and L2 and two dotted lines M1 and M2 in FIG. 1, and a sectional shape of each of these portions is shown in FIG. This will be described with reference to sectional views of 2 to 6. It should be noted that reference numeral 20 indicates a portion in the shape of the cutter body 2, and reference numeral 10 indicates a portion in the shape of the adapter 1.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, in which both stepped portions J and K (both of which are stepped shapes) having a substantially L-shaped section are formed in the same manner as in the conventional case. . Code 2a
Indicates a cutting edge provided on the inner peripheral portion of the cutter body 2, and reference numeral 2b indicates a tip. The stepped portion J of the cutter body 2 has a cylindrical outer peripheral surface 22 that is an inner side and a cylindrical outer peripheral surface 21 that is an outer side, and the stepped portion J is formed by a ring-shaped surface 20 that connects these cylindrical outer peripheral surfaces 21 and 22. It is formed. Further, the stepped portion K of the adapter 1 has a columnar inner peripheral surface 11 which is an inner side and a columnar inner peripheral surface 12 which is an outer side,
A ring-shaped surface 10 that connects the inner circumferential surfaces 11 and 12 of both cylinders.
The stepped portion K is formed by. These stepped portions J and K are in contact with each other on their respective surfaces 10 and 20, and there is a certain amount of clearance between the cylinder outer peripheral surfaces 21 and 22 parallel to the rotation axis and the cylinder inner peripheral surfaces 11 and 12. It is fitted and has.

Next, the sectional shape taken along the line BB in FIG. 1 will be described with reference to FIG. In the concave portion (see FIG. 2) formed by the outer peripheral surface 22 (see FIG. 2) of the cylinder and the surface 20 inside the stepped portion J of the cutter body 2, the main body side rib 23 (rib) having an inclined surface with an inclination angle θ. Is formed. Further, a convex portion (see FIG. 2) formed by the inner circumferential surface 11 of the cylinder (see FIG. 2) and the surface 10 inside the stepped portion K of the adapter 1 so as to face this.
An adapter side surface chamfered portion 13 (chamfered portion) having an inclination angle θ is formed on the. The adapter chamfered portion 13 has a width dimension slightly larger than the width of the main body side rib 23 to be fitted and is evenly arranged in the cross direction in a plan view (see the dotted line in FIG. 1). reference).

Next, the sectional shape taken along the line CC in FIG. 1 will be described with reference to FIG. A main body having an inclined surface with an inclination angle θ (not shown) on a convex portion (see FIG. 2) formed by the outer peripheral surface 21 (see FIG. 2) of the stepped portion J of the cutter body 2 and the surface 20. The chamfered portion 24 (chamfered portion) is formed. Further, in a concave portion (see FIG. 2) formed by the cylindrical inner peripheral surface 12 (see FIG. 2) and the surface 10 on the outside of the stepped portion K of the adapter 1 so as to face the inclination angle θ (not shown). ), The adapter-side rib 14 (rib) is formed. The main body side chamfered portion 24 has a width slightly larger than the width of the adapter-side rib 14 to be fitted therein, and the four main body side chamfered portions 24 are evenly arranged in the cross direction in a plan view (see FIG. 1).

Next, the sectional shape taken along the line DD of FIG. 1 will be described with reference to FIG. Reference numeral 4 indicates a key material,
It is fixed to the keyway bottom surface 15 of the keyway 4a (see FIG. 1) formed in the adapter 1 via a bolt 5. The key member 4 has a tilt angle θ (not shown) at one end facing the center direction.
Is chamfered. A cylindrical outer peripheral surface 21 (see FIG. 2) and a surface 20 outside the stepped portion J of the cutter body 2.
(See FIG. 2), the convex portion (see FIG. 2) forms an inclination angle θ.
Chamfer 25 for key material having an inclined surface (not shown)
Is formed. Therefore, the chamfered portion 25 for the key material and the chamfered portion of the key material 4 are fitted so as to face each other. The key material 4 has the key groove bottom surface 15 fixed in the vertical direction in the figure, and the chamfered portion 25 for the key material and the chamfered portion of the key material 4 come into contact with each other to guide the cutter body 2 so that the center axes of the two are aligned. The structure is designed to The key material chamfered portion 25 has a width slightly larger than the width of the chamfered portion of the fitted key material 4 and is evenly arranged in the cross direction in a plan view (see FIG. 1). .

Next, the sectional shape taken along the line EE in FIG. 1 will be described with reference to FIG. The outer peripheral surface 21 (see FIG. 2) of the stepped portion J of the cutter body 2 is provided with a clamper groove 3a formed in conformity with the shape of the clamper 3 arranged here. Similarly, a clamper groove 3a conforming to the shape of the clamper 3 is also formed on the outer peripheral portion of the adapter 1, and the clamper 3 has a clamper groove 3a on the adapter 1 side.
It is rotatably attached to the bolt via a bolt 26.

The cutter body 2 having the sectional shape of each part described above and the adapter 1 are fitted to each other by two dotted lines M in FIG.
1, M2, these ribs 14, 23,
Alternatively, the chamfered portions 13 and 24 are evenly arranged so as to alternate.

With this structure, the rotational torque of the pin mirror cutter is adjusted by the main body side chamfer 24 formed outside the outer peripheral portion of the cutter main body 2 and the adapter of the inner peripheral portion of the adapter 1 opposed to the main body side chamfered portion 24. It is transmitted using at least the side ribs 14.

In order to transmit the rotating torque by many fitting shapes, highly accurate processing is required. However, by limiting the processing to the main body side chamfered portion 24 and the adapter-side rib 14 arranged on the same circumference, they can be formed with high precision and easily, and a plurality of arranged adapter-side ribs 14 and main bodies can be formed. It is possible to evenly transfer the load of the rotational torque to the side chamfer 24.

Therefore, when a rotation torque is applied to the adapter 1 in the rotation direction R, this rotation torque is transmitted by the fitting between the main body side chamfer 24 and the adapter rib 14 in FIG. In other words, the main body side chamfer 2
4, the side surface of the adapter-side rib 14 first comes into contact with the side surface of the adapter side rib 14, and the side surface of the adapter side chamfered portion 13 and the body-side rib 23
A gap is provided so as not to make contact with the side surface of the.

This is also for the purpose of making the portion to which the rotational torque is transmitted uniform, and by making the outer side in the circumferential direction the portion for transmitting the torque, the load of moment is reduced, facilitating the manufacture and durability. It will have both the improvement of sex.

According to the pin mirror cutter of this embodiment described above, the rigidity in fitting the cutter body 2 and the adapter 1 is improved, and a pin mirror cutter capable of performing highly accurate processing can be realized.

Further, as a modified example of the pin mirror cutter of this embodiment, the following configuration may be adopted. The pin mirror cutter according to the present embodiment shown in FIGS. 1 to 6 is a so-called internal type pin mirror cutter in which each chip 2b is attached to the inner peripheral portion of the cutter main body 2. Attached each tip with the cutting blade protruding,
A so-called external type pin mirror cutter may be used. According to such a pin mirror cutter, high rigidity and high precision processing can be realized as in the present embodiment.

Further, each of the ribs 14 and 23 and the chamfered portions 13 and 24 has been described as having four sets and the shape of the inclination angle θ, but it is necessary to further provide the number and the inclination angle for each. It may be set. According to this, the necessary and sufficient rigidity can be secured according to the shape, and it is possible to achieve both the manufacturing cost and the rigidity.

Furthermore, the main body side chamfer 24 and the adapter side rib 14 are used as the rotational torque transmitting portions, but the present invention is not limited to these, and the adapter side chamfer 13 and the main body side rib 23 are fitted together. The key material 4 may be used. It should be noted that the present invention is shown as an embodiment of the pin mirror cutter according to the present invention, and the present invention is not limited to these.

[0045]

As described above, according to the pin mirror cutter of the first aspect, the chamfered portion and the rib face each other on the stepped peripheral portion where the cutter body and the adapter are fitted. Since these are fitted together, the rigidity of the stepped shape and the rigidity of the pin mirror cutter are improved by these fittings, and it is possible to realize an internal type pin mirror cutter capable of highly accurate processing on the work piece. it can.

According to the second aspect of the present invention, in the external type pin mirror cutter in which the cutter body is arranged outside the adapter, the chamfered portion is formed on the stepped peripheral portion where the cutter body and the adapter are fitted. Since the rib and the rib are formed so as to face each other, the rigidity of the stepped shape and the rigidity of the pin mirror cutter are improved by these fittings,
It is possible to realize a pin mirror cutter capable of highly accurately processing a work piece.

According to the pin mirror cutter of the third aspect, the plurality of chamfered portions and the ribs are formed so as to face each other on the stepped peripheral portion where the cutter body and the adapter are fitted. By fitting these together, the rigidity of the pin mirror cutter is improved over the whole, and it becomes possible to perform highly accurate processing on the workpiece.

According to the pin mirror cutter of the fourth aspect, since the cutter body and the adapter are fitted by using the key material having the chamfered shape, the guide body can be easily guided on the same axis and the rigidity can be improved. It is possible to provide a highly accurate pin mirror cutter that secures.

[Brief description of drawings]

FIG. 1 is a plan view illustrating the overall configuration of a pin mirror cutter according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

FIG. 4 is a cross-sectional view taken along the line CC of FIG.

5 is a cross-sectional view taken along the line DD of FIG.

6 is a cross-sectional view taken along the line EE of FIG.

FIG. 7 is a plan view illustrating a configuration of a conventional pin mirror cutter.

8 is a cross-sectional view taken along the line FF of FIG.

FIG. 9 is a schematic configuration diagram of a processing machine to which a pin mirror cutter is attached.

[Explanation of symbols]

1 adapter 2 cutter body 4 key material 4a keyway 5 Volts 13 Adapter chamfer (chamfer) 14 Body side chamfer (chamfer) 23 Body side rib (rib) 24 Adapter side rib (rib) Chamfer for 25 key materials J, K Stepped part (stepped shape)

Claims (4)

[Claims] 1. A cutter body, which has an annular shape and in which cutting blades are arranged on an inner peripheral portion, is mounted in a fitted state on an inner peripheral portion of an adapter for rotationally driving a processing machine, and these are integrated around an axis line. In a pin mirror cutter that performs cutting with the cutting edge by rotating, the outer peripheral portion of the cutter body and the inner peripheral portion of the adapter,
Ribs are formed along the circumferential direction on at least one of the inner peripheral portion of the adapter and the outer peripheral portion of the cutter body, and the chamfer facing the ribs is formed on the other. A pin mirror cutter characterized in that a portion is formed. 2. A cutter body, which has an annular shape and in which cutting blades are arranged on an outer peripheral portion, is attached to an outer peripheral portion of an adapter which is rotationally driven of a processing machine in a fitted state, and integrally rotates these around an axis line. In the pin mirror cutter that performs cutting with the cutting edge by, the inner peripheral portion of the cutter body and the outer peripheral portion of the adapter,
Ribs are formed along the circumferential direction on at least one of the outer peripheral portion of the adapter and the inner peripheral portion of the cutter body, and the chamfer facing the ribs is formed on the other. A pin mirror cutter characterized in that a portion is formed. 3. The pin mirror cutter according to claim 1, wherein a plurality of the ribs and the chamfered portions are formed. 4. The pin mirror cutter according to any one of claims 1 to 3, wherein a substantially rectangular key groove is formed in a circumferential direction on a peripheral portion of the adapter where the cutter body is fitted. At least 3 along
One or more are formed, a key material with chamfered ends is fitted into each of the key grooves, and a chamfered portion for key material is formed on the peripheral portion of the cutter body that is in contact with each of the key grooves. Pin mirror cutter that is characterized by.