JP5157108B2 - Pin mirror cutter insert and pin mirror cutter - Google Patents

Description

  The present invention relates to an insert for a pin mirror cutter used when machining a crankshaft used for, for example, a reciprocating internal combustion engine, and a pin mirror cutter equipped with the insert.

  Conventionally, a pin mirror cutter and an insert used therefor are known as tools for processing a crankshaft or the like of a reciprocating engine. In this pin mirror cutter, a plurality of first insert mounting seats are formed on the inner peripheral surface of a substantially annular cutter body rotated about an axis, and second insert mounting seats are formed on both side surfaces of the cutter body. Are formed, and the same type of insert is mounted on each of the first insert mounting seat and the second insert mounting seat.

  This insert has a substantially isosceles trapezoidal flat plate shape, and is parallel to upper and lower surfaces arranged opposite to each other in the thickness direction, a pair of long side surfaces arranged opposite to each other in the short direction, and a longitudinal And a pair of parallel short side surfaces disposed opposite to each other at both ends in the direction. Therefore, a pair of acute corner portions having substantially the same corner angle and a pair of obtuse corner portions having substantially the same corner angle are provided. And on the upper and lower surfaces, a curved surface portion is formed on a pair of short side surfaces connecting a pair of acute angle corner portions and a pair of obtuse angle corner portions, and a substantially convex curve shape is formed on a cross ridge line portion between these curved surface portions and a pair of long side surfaces. A total of eight curved blades are formed. In addition, a total of four straight blades that form a substantially straight line are formed at the intersecting ridge line portion between the portion excluding the curved surface portions of the upper and lower surfaces and the pair of long side surfaces. These curved blades and straight blades may be formed with honing for improving the life of the cutting blade.

The insert mounted on the first insert mounting seat has an axial rake (rake angle in the axial direction): positive, radial rake. (Diameter rake angle): It is made to project from the inner peripheral surface of the cutter body so as to be negative, and is a pin blade for processing the outer peripheral surface of the pin portion (shaft portion) in the crankshaft.
In addition, the insert mounted on the second insert mounting seat has a curved blade formed at an obtuse corner portion of the insert body having a substantially isosceles trapezoidal flat plate shape, an axial rake (axial rake angle): negative, Radial rake (radial rake angle): Projected from the end face of the cutter body so as to be negative, it is a wave blade for machining the side surface of the counterweight portion of the crankshaft.

In such a pin mirror cutter, by inserting the same type of insert into the first and second insert mounting seats, eight curved blades and four straight blades formed on one insert can be cut respectively. This can be used to reduce tool costs. By using an insert having a substantially isosceles trapezoidal flat plate-like insert body, the axial rake given to the curved blade of the pin blade of the insert mounted on the first insert mounting seat is corrected. In addition, with respect to the insert mounted on the second insert mounting seat, the radial rake given to the curved blade of the wave blade is not significantly increased to the negative angle side, thereby reducing the cutting resistance. In addition, the strength of the insert is improved to extend the life of the cutting edge, that is, to reduce the running cost (see, for example, Patent Document 1).
JP 2005-138193 A

  By the way, the cutting impact applied to the insert disclosed in Patent Document 1 has a strong cutting impact on a curved blade at an acute corner portion from the mounted state, and a relatively weak impact on a straight blade compared with a curved blade. However, when honing is formed on the cutting edge with such an insert as described above, a portion where the cutting impact is strong and a portion where the cutting is relatively weak have the same honing shape. If the width or angle is reduced, the cutting resistance increases, and the life of the cutting edge at a location where the cutting impact is strong deteriorates. On the other hand, when the honing width or angle is increased in order to extend the life of the cutting blade, the cutting resistance is reduced, but the machinability is lowered. For this reason, there is a problem that it is not an effective solution for reducing the running cost because it is subject to either the extension of the life of the cutting blade or the improvement of the machinability. .

  Therefore, the present invention has been made in view of the above-described circumstances, and the cutting cost is improved by applying honing of the optimum shape to the cutting edge depending on the cutting location, while extending the life of the cutting edge, thereby reducing the running cost. It is intended to provide a pin mirror cutter insert capable of reducing the above and a pin mirror cutter equipped with this insert.

In order to solve the above problems, the present invention includes a first insert mounting seat formed on a peripheral surface of a cutter body having a substantially annular shape or a substantially disc shape of a pin mirror cutter rotated around an axis, An insert for a pin mirror cutter mounted on a second insert mounting seat formed on a side surface of the cutter body, and is opposed to one of four side surfaces along the thickness direction of the insert body having a rectangular flat plate shape. A pair of side surfaces are rake faces, and the first insert mounting seat is mounted so that the thickness direction of the insert body faces the radial direction of the cutter body, and protrudes from the peripheral surface of the cutter body. the cutting edge is a pin blade, wherein in the second insert mounting seat, the thickness direction of the mounting so as to face the axial direction of the cutter body of the insert body were , Wherein the cutting edge that protrudes from the side surface of the cutter body is a wave blade, the cutting edge formed on Henryo portion of the rake face, honing to form, the honing keeps the honing width constant However, the honing angle gradually increases continuously toward the one end side of the rake face on which the cutting edge to be the pin blade is formed. On the other hand, in the range other than the one end side of the rake face , the honing angle The angle is constant .

Further, the present invention is a first insert mounting seat formed on the peripheral surface of the cutter body having a substantially annular shape or a substantially disk shape of the pin mirror cutter rotated about the axis, and formed on the side surface of the cutter body. An insert for a pin mirror cutter to be mounted on the second insert mounting seat, wherein a pair of opposing side surfaces of the four side surfaces along the thickness direction of the insert body having a rectangular flat plate shape are rake surfaces. In the first insert mounting seat, the insert body is mounted so that the thickness direction of the insert body faces the radial direction of the cutter body, and the cutting blade protruding from the peripheral surface of the cutter body is a pin blade. is a, the in the second insert mounting seat, the thickness direction of the insert body is mounted so as to face the axial direction of the cutter body, said cutter body Serial The cutting edge that protrudes from the side is a wave blade, the cutting edge formed on Henryo portion of the rake face, honing to form, the honing, while keeping the honing angle constant, the honing width The honing width is constant in a range other than one end side of the rake face while gradually increasing toward the one end side of the rake face on which the cutting edge to be the pin blade is formed. It is characterized by.

Further, the present invention provides a first insert mounting seat formed on a peripheral surface of a cutter body having a substantially annular shape or a substantially disk shape of a pin mirror cutter rotated around an axis, and formed on a side surface of the cutter body. An insert for a pin mirror cutter to be mounted on the second insert mounting seat, wherein a pair of opposing side surfaces of the four side surfaces along the thickness direction of the insert body having a rectangular flat plate shape are rake surfaces. In the first insert mounting seat, the insert body is mounted so that the thickness direction of the insert body faces the radial direction of the cutter body, and the cutting blade protruding from the peripheral surface of the cutter body is a pin blade. is a, the in the second insert mounting seat, the thickness direction of the insert body is mounted so as to face the axial direction of the cutter body, the cutter body Wherein the cutting edge that protrudes from the side is a wave blade, the cutting edge formed on Henryo portion of the rake face, honing to form, the honing, the honing width and honing angle, and the pin blade The honing width and the honing angle are constant in a range other than one end side of the rake face while gradually increasing toward the one end side of the rake face where the cutting edge is formed . It is characterized by that.

  In the present invention, the insert body has a substantially isosceles trapezoidal flat plate shape in plan view, the side surface corresponding to the hypotenuse part of the isosceles trapezoidal shape is the rake face, and the bottom side of the isosceles trapezoid is the rake face. It is the said one end side of a surface, It is characterized by the above-mentioned.

  Further, in the present invention, such an insert for a pin mirror cutter is mounted in the first insert mounting seat so that the thickness direction of the insert body faces the radial direction of the cutter body. The cutting blade protruding from the peripheral surface of the cutter is a pin blade, and the second insert mounting seat is mounted so that the thickness direction of the insert body faces the axial direction of the cutter body. The cutting blade protruding from the side surface of the main body is a wave blade.

  According to the present invention, honing with a small honing angle or honing width is applied to a cutting edge formed at a relatively weak cutting impact on the side surface to be a rake face, and one end side of the rake face, that is, a strong cutting impact is applied. Since the honing having a large honing angle and honing width is separately formed on the cutting edge formed at each location, both cutting performance and cutting strength can be achieved at each cutting location. That is, the life of the cutting edge can be extended without impairing the machinability at both the portion where the cutting impact is weak and the portion where the cutting impact is strong, and the running cost can be reduced.

Next, a first embodiment of the present invention will be described with reference to FIGS.
The cutter body 10 of the pin mirror cutter according to the present embodiment has a substantially annular shape centering on the axis O rotated about the axis O, as shown in the enlarged views of the main part in FIGS. . In the cutter body 10, a plurality of first insert mounting seats 13 are formed at substantially equal intervals along the circumferential direction of the cutter body 10 on the inner circumferential surface 11 facing the radially inner circumferential side, and are outside the axis O direction. A plurality of second insert mounting seats 14 are formed at substantially equal intervals along the circumferential direction of the cutter body 10 on the inner peripheral surface 11 side of both end surfaces (side surfaces) 12A, 12B facing the side.

The plurality of first insert mounting seats 13 formed on the inner peripheral surface 11 of the cutter body 10 are arranged near one end surface 12A of the both end surfaces 12A and 12B of the cutter body 10 in the circumferential direction. Those arranged near the other end face 12B are arranged alternately in the circumferential direction of the cutter body 10.
The plurality of second insert mounting seats 14 formed on one end surface 12A of the cutter body 10 are slightly different from the plurality of first insert mounting seats 13 formed on the inner peripheral surface 11 near the other end surface 12B. A plurality of second insert mounting seats 14 arranged on the other end surface 12B of the cutter body 10 and arranged in the circumferential direction so as to be arranged on the rear side of the cutter rotation direction T are also inner peripheral surfaces near the one end surface 12A. The plurality of first insert mounting seats 13 formed in 11 are arranged in the circumferential direction so as to be slightly arranged on the rear side in the cutter rotation direction T.

The insert body 20 of the insert mounted on the first insert mounting seat 13 and the second insert mounting seat 14 as described above has a substantially isosceles trapezoidal flat plate shape as shown in FIGS. A pair of parallel upper and lower surfaces 21 and 21 disposed opposite to each other at both ends in the thickness direction of the insert main body 20 and a pair of the upper and lower surfaces 21 and 21 disposed opposite to each other in the lateral direction of the insert main body 20 along the oblique side of the isosceles trapezoid. The long side surfaces 22 and 22 are disposed opposite to each other at both ends in the longitudinal direction of the insert body 20, and are provided with a pair of short side surfaces 23 </ b> A and 23 </ b> B parallel to each other and along the upper and lower sides (bottom sides) of the isosceles trapezoid. Therefore, as shown in FIG. 3 in the top view (as viewed in the thickness direction of the insert body 20), the insert body 20 includes a pair of acute corner portions 24A and 24A having substantially the same corner angle, Similarly, a pair of obtuse corner portions 24B and 24B having the same corner angle are provided.
Here, an insertion hole 20A through which a clamp screw used when the insert is screwed is inserted in a substantially central portion of the insert body 20 in the thickness direction of the insert body 20 (the left-right direction in FIG. It is formed so as to penetrate the upper and lower surfaces 21 (a direction substantially perpendicular to the upper and lower surfaces 21).

The pair of long side surfaces 22, 22 of the insert body 20 is configured by one substantially flat surface that is substantially parallel to the thickness direction of the insert body 20, and the pair of short side surfaces 23 </ b> A, 23 </ b> B of the insert body 20 is also configured. , Each of which is constituted by a substantially flat surface which is substantially parallel to the thickness direction of the insert body 20.
The pair of long side surfaces 22 and 22 of the insert body 20 intersect with the pair of short side surfaces 23A and 23B of the insert body 20 at both end portions in the longitudinal direction (left and right direction in FIG. 3) of the insert body 20, respectively. However, as shown in FIG. 5, both end portions in the longitudinal direction of each of the upper and lower surfaces 21 and 21 are processed into convex curved surfaces.
In the upper and lower surfaces 21, 21, the connecting portions to the short side surfaces 23A, 23B connecting the corner portions 24A, 24A, 24B, 24B are smoothly connected to the short side surfaces 23A, 23B as shown in FIG. The curved surface portion 27 is formed.

The insert body 20 is formed with cutting edges at intersection ridges between the pair of long side surfaces 22 and 22 and the upper and lower surfaces 21 and 21.
More specifically, a total of eight curved blades 25A having a substantially convex curved shape are formed at the intersecting ridge line portions of the curved surface portions 27 of the upper and lower surfaces 21 and 21 and the pair of long side surfaces 22 and 22, respectively. A total of four straight blades 25B that form a substantially straight line are formed at the intersecting ridge line portion between each of the lower surfaces 21, 21 excluding the curved surface portion 27 and the pair of long side surfaces 22, 22. A total of eight curved blades 25A and a total of four straight blades 25B are formed in the insert.

Moreover, the honing 30 is formed in the side ridge part of a pair of long side surfaces 22 and 22 containing these curve blade 25A and the linear blade 25B. Specifically, it is shown in FIGS. FIG. 6 is an enlarged cross-sectional view taken along lines AA, BB, and CC in FIG. 5 and is shown in the same drawing for convenience of explanation.
As shown in FIGS. 5 and 6, the honing width W of the honing 30 is set to be constant over the entire circumference of the side ridge portion of the long side surface 22, but the honing angle θ is larger than the honing angle θA of the straight blade 25B. The honing angle θB in the curved blade 25A on the acute corner portion 24A side is set to be large, and further, on the short side surface 23B side (the bottom side of the isosceles trapezoid, the left side in FIG. 5), the honing angle θC is set to be larger than the honing angle θB. Are formed continuously. Note that the honing angle θ of the honing 30 formed in the range H extending from the straight blade 25B and the short side surface 23A side (the upper side of the isosceles trapezoid, the right side in FIG. 5) on the obtuse corner portion 24B side to the straight blade 25B is θA. Is set.

  In general, the shape of the honing formed on the cutting blade (curved blade 25A, straight blade 25B in the present invention) is set to be constant with a honing width W of 0.15 mm and a honing angle θ of 15 °. In this first embodiment, for example, it is desirable to set the honing width W to 0.15 mm, and to set the honing angle θ to 15 °, θB to 20 °, and θC to 25 °, respectively.

  The insert configured as described above has the thickness direction of the insert body 20 substantially coincided with the radial direction of the cutter body 10 with respect to the first insert mounting seat 13, and the pair of long side faces 22, 22. Is clamped by a clamp screw 15 that is inserted into the insertion hole 20A of the insert body 20 so that one of them is a rake face toward the front side of the cutter rotation direction T.

The insert mounted on the first insert mounting seat 13 has one curved blade 25A (in particular, upper and lower surfaces 21, 21 and short side surfaces) formed at an acute corner portion 24A among the eight curved blades 25A formed thereon. One of the four curved blades 25A) formed on the intersecting ridge line portion of the curved surface portion 27 and the long side surface 22 constituting the portion where 23A and 23B intersect with each other, A straight blade 25B connected to the curved blade 25A is projected from the end surface 12A (12B) of the cutter main body 10 to the outer side in the axial direction O, and the straight blade 25B connected to the curved blade 25A is formed inside the cutter main body 10. It protrudes from the peripheral surface 11 to the radially inner peripheral side.
The curved blade 25A and the straight blade 25B arranged in such a protruding state serve as pin blades for processing the outer peripheral surface of the pin portion (shaft portion) in the crankshaft.

Further, the curved surface portion 27 connected to the cutter rotation direction T rear side of the curved blade 25A, which is a pin blade, is inclined so as to go to the radially outer peripheral side toward the cutter rotation direction T rear side, and the cutter rotation direction. T is inclined to the inner side in the direction of the axis O as it goes rearward, and relief is given to the curved surface portion 27 that forms the flank of the curved blade 25A that is a pin blade.
Therefore, the radial rake R (radial rake angle) of the curved blade 25A, which is a pin blade, is inclined so that the curved blade 25A moves toward the front side of the cutter rotation direction T as it goes toward the radially outer peripheral side. , Is set negative (for example, −8 °).

On the other hand, the axial rake A (axial rake angle) of the curved blade 25A, which is a pin blade, is inclined so that the curved blade 25A moves toward the rear side in the cutter rotation direction T as it goes inward in the axis O direction. Is set to be positive (for example, 6 °).
That is, since there is an acute corner portion 24A in which the long side surface 22 and the short side surface 23 that form a rake face intersect each other at an acute angle, the curved surface portion 27 that forms the flank of the curved blade 25A that is a pin blade. Even if escape is given, the axial rake of the curved blade 25A, which is a pin blade, can be set positively.

  On the other hand, the insert configured as described above has a pair of long side surfaces 22, with the thickness direction of the insert body 20 substantially aligned with the direction of the axis O of the cutter body 10 with respect to the second insert mounting seat 14. It is attached by being screwed with a clamp screw 15 inserted into the insertion hole 20A of the insert body 20 so that one of 22 is a rake face toward the front side of the cutter rotation direction T.

The insert mounted on the second insert mounting seat 14 has one curved blade 25A (in particular, upper and lower surfaces 21, 21 and short side surfaces) formed at an obtuse corner portion 24B of the eight curved blades 25A formed thereon. One of the four curved blades 25A) formed on the intersecting ridge line portion of the curved surface portion 27 and the long side surface 22 constituting the portion where 23A and 23B intersect each other is used as the end surface of the cutter body 10 12A (12B) protrudes outward in the axis O direction.
The curved blade 25A arranged in such a protruding state serves as a wave blade for machining the side surface of the counterweight portion of the crankshaft.

Further, the curved surface portion 21B connected to the rear side of the cutter rotation direction T of the curved blade 25A, which is a wave blade, is inclined so as to be directed inward in the axis O direction toward the rear side of the cutter rotation direction T. It is inclined so as to go to the outer peripheral side in the radial direction as it goes to the rear side in the rotational direction T, and a relief is given to the curved surface portion 21B that forms the flank of the curved blade 25A that is a wave blade.
Therefore, the axial rake A (axial rake angle) of the curved blade 25A, which is a wave blade, is inclined so that the curved blade 25A moves toward the front side of the cutter rotation direction T as it goes inward in the axis O direction. Therefore, it is set negative (for example, −6 °).
Further, the radial rake R (radial rake angle) of the curved blade 25A, which is a wave blade, is inclined so that the curved blade 25A moves toward the front side of the cutter rotation direction T as it goes toward the radially outer peripheral side. , Is set negative (for example, −17 °).

  The pin mirror cutter having such a configuration is attached to the cutter attachment portion of the processing machine so that the axis O of the cutter body 10 coincides with the main axis, and the crankshaft spanned by the chuck is connected to the inside of the cutter body 10. While rotating along the axis of the crankshaft (axis O of the cutter body 10) while being penetrated through the hollow portion, it rotates around the axis O of the cutter body 10 and revolves around the axis of the crankshaft. Thus, the crankshaft is processed into a predetermined shape.

  Therefore, according to the first embodiment described above, the honing 30 is formed on the side ridge portions of the pair of long side surfaces 22 and 22 including the curved blade 25A and the straight blade 25B of the insert body 20, and the honing width W of the honing 30 is determined. Is set to be constant (for example, 0.15 mm) and formed in a range H extending from the straight blade 25B and the short side surface 23A side (the upper side of the isosceles trapezoid, the right side in FIG. 5) on the obtuse corner portion 24B side from the straight blade 25B. The honing angle θA is set small (for example, 15 °), the honing angle θB formed on the curved blade 25A on the acute corner portion 24A side is set larger than the honing angle θA (for example, 20 °), On the short side surface 23B side (the bottom side of the isosceles trapezoid, the left side in FIG. 5), the honing angle θC is set larger than the honing angle θB (for example, 2 °), it is possible to form an optimal shape of the honing 30 by the cutting portion.

  That is, the curved blade 25A on the acute corner portion 24A side where the cutting impact is stronger than the honing angle θA in the relatively weak range H of the cutting impact, and further on the short side surface 23B side (the bottom side of the isosceles trapezoid, the left side in FIG. 5). By gradually increasing the honing angles θB and θC as it goes, that is, one end side of the long side surface 22 that is a rake face (the short side surface 23B side, that is, the bottom side of the isosceles trapezoidal shape) By gradually and continuously increasing the honing angles θB and θC toward the point, it is possible to achieve both cutting performance and cutting edge strength separately at a portion where the cutting impact is weak and a portion where the cutting impact is strong. Therefore, the life of the cutting edge can be extended without impairing the machinability at both the portion where the cutting impact is weak and the portion where the cutting impact is strong, and the running cost can be reduced.

Next, a second embodiment of the present invention will be described based on FIGS. 7 and 8 with reference to FIG. FIG. 7 shows an insert body 40 according to a second embodiment of the present invention, and FIG. 8 is an enlarged sectional view taken along lines AA, BB, and CC in FIG. In addition, the same code | symbol is attached | subjected and demonstrated to the same aspect as 1st embodiment (same also in the following embodiment).
Here, in 2nd embodiment and 3rd embodiment mentioned later, insert main bodies 40 and 50 make a substantially isosceles trapezoid flat plate shape provided with a pair of long side surfaces 22 and 22 and a pair of short side surfaces 23A and 23B. The longitudinal direction of the insert main body 40 includes a pair of acute corner portions 24A and 24A having substantially the same corner angle and a pair of obtuse corner portions 24B and 24B having the same corner angle. A curved surface portion 27 is formed at both end portions of each, and a total of eight curved blades that form a substantially convex curved shape are formed at the intersecting ridge line portions of the curved surface portion 27 and the pair of long side surfaces 22 and 22, A total of four straight blades 25B that form a substantially straight line are formed at the intersecting ridge line portion between the pair of long side surfaces 22 and 22 except the curved surface portion 27 of each of the upper and lower surfaces 21 and 21; these The basic configuration of the insert body 40, such as the honing 41, 51 formed on the side ridges of the pair of long side surfaces 22, 22 including the wire blade 25A and the straight blade 25B, is the same as in the first embodiment. .

  As shown in FIGS. 7 and 8, the honing angle θ of the honing 41 is set constant over the entire circumference of the side ridge portion of the long side surface 22, but the honing width W is sharper than the honing width WA of the straight blade 25 </ b> B. The honing width WB of the curved blade 25A on the corner portion 24A side is set to be large, and the honing width WC is set to be larger than the honing width WB on the short side surface 23B side (the bottom side of the isosceles trapezoid, the left side in FIG. 7). Are formed continuously. The honing width W of the honing 41 formed in the range H extending from the straight blade 25B and the short side surface 23A side (the upper side of the isosceles trapezoid, the right side in FIG. 7) on the obtuse corner portion 24B side to the straight blade 25B is WA. Is set.

  In the second embodiment, for example, the honing angle θ is preferably set to 15 °, and the honing width W is preferably set to 0.15 mm for WA, 0.20 mm for WB, and 0.25 mm for WC, respectively. In addition, although the honing angle θ is 15 ° here, the honing angle θ may be in the range of 10 ° to 30 °.

  Therefore, according to the above-described second embodiment, the honing angle θ of the honing 41 is set to be constant (for example, 15 °), and the short side surface 23A side on the obtuse corner portion 24B side from the straight blade 25B and the straight blade 25B ( The honing width WA formed in the range H extending over the upper side of the isosceles trapezoid and the right side in FIG. 5 is set small (for example, 0.15 mm), and the honing width formed in the curved blade 25A on the acute corner portion 24A side. WB is set larger than the honing width WA (for example, 0.20 mm), and on the short side surface 23B side (the bottom side of the isosceles trapezoid, the left side in FIG. 5), the honing width WC is set larger than the honing width WB. Therefore, the optimum shape of the honing 41 can be formed depending on the cutting location.

  That is, the curved blade 25A on the acute corner portion 24A side where the cutting impact is stronger than the honing width WA in the range H where the cutting impact is relatively weak, and further on the short side surface 23B side (the bottom side of the isosceles trapezoid, the left side in FIG. 5). By gradually increasing the honing widths WB and WC as they go, that is, at one end side of the long side surface 22 that is a rake face (the short side surface 23B side, that is, the bottom side of the isosceles trapezoid), By gradually and continuously increasing the honing widths WB and WC as they go, it is possible to achieve both cutting performance and cutting edge strength separately at a portion where the cutting impact is weak and a portion where the cutting impact is strong. In particular, in the second embodiment, by increasing the honing width W of the portion where the cutting impact is strong, the cutting edge strength can be further increased and the life of the cutting edge can be further extended.

Next, a third embodiment of the present invention will be described with reference to FIGS. 9 and 10 with reference to FIG. FIG. 9 shows an insert body 50 according to a third embodiment of the present invention, and FIG. 10 is an enlarged sectional view taken along lines AA, BB, and CC in FIG.
As shown in FIGS. 9 and 10, the honing width W and the honing angle θ of the honing 51 are the honing width WB and the honing in the curved blade 25A on the acute corner portion 24A side than the honing width WA and the honing angle θA in the straight blade 25B. The angle θB is set larger, and on the short side surface 23B side (the bottom side of the isosceles trapezoid, the left side in FIG. 7), the honing width WC and the honing angle θC are set larger than the honing width WB and the honing angle θB. Are formed continuously. That is, on one end side of the long side surface 22 that is a rake face (the short side surface 23B side, that is, the bottom side of the isosceles trapezoid), both the honing width W and the honing angle θ gradually increase toward the one end side. It is getting bigger. The honing width W and the honing angle of the honing 51 formed in the range H extending from the straight blade 25B and the short side 23A side (the upper side of the isosceles trapezoid, the right side in FIG. 7) on the obtuse corner portion 24B side. θ is set to WA and θA, respectively.

  In the third embodiment, the honing width W is set to 0.15 mm for WA, 0.20 mm for WB, and 0.25 mm for WC, and the honing angle θ is set to 15 ° for θA and 20 ° for θB. , ΘC is preferably set to 25 °.

  Therefore, according to the third embodiment described above, the straight blade 25B and the straight blade 25B are formed in a range H extending from the short blade 23A side (the upper side of the isosceles trapezoid, the right side in FIG. 9) on the obtuse corner portion 24B side. The honing width WA and the honing angle θA are set to be small (for example, WA is 0.15 mm, θA is 15 °), and the honing width WB and the honing angle θB formed on the curved blade 25A on the acute corner portion 24A side Is set to be larger than the honing width WA and the honing angle θA (for example, WB is 0.20 mm, θB is 20 °), and on the short side surface 23B side (the bottom side of the isosceles trapezoid, the left side in FIG. 9) The width WC and the honing angle θC are set larger than the honing width WB and the honing angle θB (for example, WC is 0.25 mm and θC is 25 °). Therefore, it is possible to form an optimum honing 51 that achieves both machinability and cutting edge strength for each cutting location. In particular, in the third embodiment, by increasing both the honing width W and the honing angle θ at a location where the cutting impact is strong, it is possible to achieve both better cutting performance and cutting edge strength.

In each of the above-described embodiments, the present invention is described as being applied to a so-called internal type pin mirror cutter. However, the present invention is not limited to this, and the cutter body faces the radially outer peripheral side. A plurality of first insert mounting seats are formed on the outer peripheral surface, and a plurality of second insert mounting seats are formed on each outer peripheral surface side of both end surfaces facing the axial direction. The present invention may be applied to a so-called external pin mirror cutter in which inserts are respectively attached to the seat and the second insert mounting seat.
Moreover, although embodiment mentioned above demonstrated the case where insert main body 20,40,50 makes a substantially isosceles trapezoid flat plate shape provided with a pair of long side surfaces 22 and 22 and a pair of short side surfaces 23A and 23B. However, the present invention is not limited to this, and may be a rectangular flat plate shape. Furthermore, in the said embodiment, in the said range H other than the said one end side of the long side surface 22, the honing width W and honing angle | corner (theta) of honing 30,41,51 are made constant, respectively .

It is principal part expansion explanatory drawing of the end surface in the cutter main body of the pin mirror cutter in embodiment of this invention. It is principal part expansion explanatory drawing of the internal peripheral surface in the cutter main body of the pin mirror cutter in embodiment of this invention. It is a top view of the insert main body of the insert with which the pin mirror cutter in the first embodiment of the present invention is mounted. FIG. 4 is a view taken in the direction of arrow X in FIG. 3. FIG. 4 is a view on arrow Y in FIG. 3. The shape of the honing in 1st embodiment of this invention is shown, and it is a cross-sectional enlarged view which follows the AA line, BB line, and CC line of FIG. It is a side view equivalent to the Y arrow line view of FIG. 3 of the insert main body in 2nd embodiment of this invention. The shape of the honing in 2nd embodiment of this invention is shown, and it is a cross-sectional enlarged view which follows the AA line, BB line, and CC line of FIG. It is a side view equivalent to the Y arrow line view of FIG. 3 of the insert main body in 3rd embodiment of this invention. The shape of the honing in 3rd embodiment of this invention is shown, and it is a cross-sectional enlarged view which follows the AA line, BB line, and CC line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cutter main body 13 1st insert mounting seat 14 2nd insert mounting seat 20,40,50 Insert main body 21 Upper and lower surfaces of insert main body 20,40,50 22 Length used as rake face of insert main body 20,40,50 Side 23A Short side (upper side) of the insert body 20, 40, 50
23B Short side (base) of insert body 20, 40, 50
25A Curved blade 25B Straight blade 30, 41, 51 Honing W, WA, WB, WC Honing width θ, θA, θB, θC Honing angle

Claims (5)

A first insert mounting seat formed on the peripheral surface of the cutter body having a substantially annular shape or a substantially disk shape of the pin mirror cutter rotated around the axis, and a second insert formed on the side surface of the cutter body An insert for a pin mirror cutter to be attached to a mounting seat,
Among the four side surfaces along the thickness direction of the insert body having a rectangular flat plate shape, a pair of opposite side surfaces is a rake surface,
In the first insert mounting seat, the insert body is mounted such that the thickness direction of the insert body faces the radial direction of the cutter body, and the cutting blade protruding from the peripheral surface of the cutter body is a pin blade. ,
In the second insert mounting seat, the insert body is mounted so that the thickness direction of the insert body faces the axial direction of the cutter body, and the cutting blade protruding from the side surface of the cutter body is a wave blade,
Honing is formed on the cutting edge formed on the edge of the rake face,
In the honing, while maintaining the honing width constant, the honing angle gradually increases continuously toward the one end side of the rake face on which the cutting edge to be the pin blade is formed . The pin mirror cutter insert characterized in that the honing angle is constant in a range other than one end side . A first insert mounting seat formed on the peripheral surface of the cutter body having a substantially annular shape or a substantially disk shape of the pin mirror cutter rotated around the axis, and a second insert formed on the side surface of the cutter body An insert for a pin mirror cutter to be attached to a mounting seat,
Among the four side surfaces along the thickness direction of the insert body having a rectangular flat plate shape, a pair of opposite side surfaces is a rake surface,
In the first insert mounting seat, the insert body is mounted such that the thickness direction of the insert body faces the radial direction of the cutter body, and the cutting blade protruding from the peripheral surface of the cutter body is a pin blade. ,
In the second insert mounting seat, the insert body is mounted so that the thickness direction of the insert body faces the axial direction of the cutter body, and the cutting blade protruding from the side surface of the cutter body is a wave blade,
Honing is formed on the cutting edge formed on the edge of the rake face,
In the honing, while maintaining the honing angle constant, the honing width gradually increases continuously toward one end side of the rake face on which the cutting edge to be the pin blade is formed . The pin mirror cutter insert characterized in that the honing width is constant in a range other than one end side . A first insert mounting seat formed on the peripheral surface of the cutter body having a substantially annular shape or a substantially disk shape of the pin mirror cutter rotated around the axis, and a second insert formed on the side surface of the cutter body An insert for a pin mirror cutter to be attached to a mounting seat,
Among the four side surfaces along the thickness direction of the insert body having a rectangular flat plate shape, a pair of opposite side surfaces is a rake surface,
In the first insert mounting seat, the insert body is mounted such that the thickness direction of the insert body faces the radial direction of the cutter body, and the cutting blade protruding from the peripheral surface of the cutter body is a pin blade. ,
In the second insert mounting seat, the insert body is mounted so that the thickness direction of the insert body faces the axial direction of the cutter body, and the cutting blade protruding from the side surface of the cutter body is a wave blade,
Honing is formed on the cutting edge formed on the edge of the rake face,
In the honing, the honing width and the honing angle gradually and continuously increase toward the one end side of the rake face on which the cutting edge to be the pin blade is formed, while the range other than one end side of the rake face The pin mirror cutter insert is characterized in that the honing width and the honing angle are constant .   The insert body has a substantially isosceles trapezoidal flat plate shape in plan view, the side surface corresponding to the hypotenuse part of the isosceles trapezoid shape is the rake face, and the bottom side of the isosceles trapezoid is the one end side of the rake face. The insert for a pin mirror cutter according to any one of claims 1 to 3, wherein the insert is for a pin mirror cutter. The insert for a pin mirror cutter according to any one of claims 1 to 4,
In the first insert mounting seat, the insert body is mounted such that the thickness direction of the insert body faces the radial direction of the cutter body, and the cutting blade protruding from the peripheral surface of the cutter body is a pin blade. ,
In the second insert mounting seat, the insert body is mounted such that the thickness direction of the insert body faces the axial direction of the cutter body, and the cutting blade protruding from the side surface of the cutter body is a wave blade. A pin mirror cutter characterized by

Images