JP5707653B2 - Insert and cutter with insert - Google Patents

Description

  The present invention relates to an insert and a cutter including the insert.

  Patent Document 1 describes an insert used as a cutting tool for a boring cutter. This insert has a substantially rectangular flat plate-like outer shape, and cutting edges are formed at all eight corners. In this insert, the service life of the insert is improved by sequentially using all eight corners as used corners.

JP 2008-23632 A

  Here, while the demand for cost reduction in cutting is increasing, the insert is required to improve the service life. In the conventional insert described above, there is still room for improvement in the number of corners used, and it is difficult to say that the market life requirements can be satisfied with respect to the service life.

  Then, an object of this invention is to provide the cutter provided with the insert and insert which can improve a service life.

  In order to solve the above problems, an insert according to the present invention has a first main surface and a second main surface facing each other, and an outer peripheral side surface between the first main surface and the second main surface. The outer peripheral side surface has convex surfaces and concave surfaces alternately formed in the circumferential direction, and the convex surfaces and the concave surfaces are formed at least three locations, and the ridgeline between the first main surface and the concave surface and the convex surface and the concave surface Cutting edges are formed at all of the first corner where the ridge line intersects, the second corner where the ridge line between the second main surface and the concave surface and the ridge line between the convex surface and the concave surface intersect.

  According to this insert, four corners having cutting edges per one convex surface can be formed, so that a large number of used corners can be secured. In addition, in this insert, the convex surface and the concave surface are alternately formed on the outer peripheral side surface, so that the concave surface functions as a chip pocket for discharging chips to the outside, thereby improving chip dischargeability. it can. Moreover, since the concave surface of the insert functions as a chip pocket, the chip pocket on the cutter body side can be reduced in size. This is advantageous for increasing the number of blades in which a large number of inserts are arranged at a short pitch on the rotary cutting cutter, and the efficiency of the cutter can be greatly improved. Furthermore, since the amount of work per insert during cutter cutting is reduced by increasing the number of blades, the amount of chip discharge and cutting vibration at the corners used can be suppressed, and the life of the corners used can be extended. Therefore, according to this insert, it is possible to secure a large number of used corners, and it is possible to extend the service life of the used corners by increasing the number of blades of the cutter for rotary cutting. Can do.

In the insert according to the present invention, the ratio of the width of the concave surface to the width of the convex surface on the outer peripheral side surface is preferably 1.2 to 2.0.
In this insert, if the width of the concave surface forming the chip pocket is too wide, the chip extends long and is difficult to be discharged, and if it is too narrow, the chip is likely to be clogged. By making it, the width | variety of the concave surface which is easy to divide a chip | tip can be implement | achieved, and chip | tip discharge property can be improved.

In the insert according to the present invention, the concave surface is preferably a rake surface.
According to this insert, the ridge line between the first main surface and the concave surface and the ridge line between the convex surface and the concave surface can be effectively used as a cutting edge by using the concave surface as the rake face.

It is preferable to have a breaker for dividing chips on the outer peripheral side surface of the insert according to the present invention.
According to this insert, chips generated by cutting are cut into short pieces by the breaker, so that the chip discharge performance can be further improved.

In the insert according to the present invention, it is preferable that the convex surface and the concave surface are formed at five locations.
In this case, by incorporating it into the cutter, twenty use corners can be secured by the five convex surfaces, and an insert having a sufficient service life can be obtained.

  The present invention has a first main surface and a second main surface facing each other, and an outer peripheral side surface between the first main surface and the second main surface, and the outer peripheral side surfaces are alternately arranged in the circumferential direction. A first corner where the ridge line between the first main surface and the concave surface and the ridge line between the convex surface and the concave surface intersect with each other. A plurality of inserts each having a cutting edge formed on a second corner where a ridge line between the main surface and the concave surface of the second surface intersects with a ridge line between the convex surface and the concave surface, and a cutter that rotates about a predetermined rotation axis A cutter for rotary cutting comprising a main body, the cutter main body being provided on a tip outer periphery of the cutter main body, wherein the insert has the first main surface or the second main surface directed radially outward of the cutter main body. Inserted in the vertical seating part to be mounted in the posture and the outer periphery of the tip of the cutter body It has a lateral seat which is mounted the first major surface or second major surface in a posture toward the distal end side of the cutter body.

  According to this cutter, since the insert according to the present invention described above is provided, it is possible to realize a multi-blade arrangement in which a large number of inserts are arranged at a short pitch, and the efficiency of the cutter can be improved. Moreover, according to this cutter, in addition to changing the rotational position and front and back of the insert, by changing the seat portion of the insert between the vertical seat portion and the lateral seat portion, all the cutting edges of the corner of the insert can be obtained. Can be used sequentially. Therefore, according to this cutter, since all the corners of the insert can be used without waste, the service life of the insert can be improved, and the cost of using the insert with respect to the cutter cutting amount can be greatly reduced. .

In the cutter according to the present invention, the longitudinal seating portion has a first longitudinal inner wall and a second longitudinal inner wall sandwiching an insert attached to the longitudinal seating portion, and the first longitudinal inner wall and The insert sandwiching angle formed by the second longitudinal inner wall is 60 ° to 80 °, and the lateral seating portion includes the first lateral inner wall and the second lateral sandwiching the insert attached to the lateral seating portion. The insert sandwich angle formed by the first lateral inner wall and the second lateral inner wall is preferably 60 ° to 80 °.
According to this cutter, if the insert pinching angle is greater than 80 °, the insert tends to rattle, and if it is less than 60 °, the insert pinching angle is too narrow. Less stable insert mounting can be achieved.

It is preferable that the insert of the cutter according to the present invention is attached to the vertical seating portion or the horizontal seating portion in a posture in which the entire convex surface having the used corner protrudes from the cutter body.
According to this cutter, cutting with the insert having a characteristic configuration can be effectively performed.

The cutter main body of the cutter according to the present invention preferably has a first pocket surface that forms one chip pocket in combination with the concave surface forming the rake face of the insert.
According to this cutter, it is possible to improve chip discharge by forming a large chip pocket by combining the first pocket surface of the cutter body and the concave surface of the insert. Moreover, since the first pocket surface can be reduced in size as compared with the case where the chip pocket is formed only in the cutter body, it is advantageous for increasing the number of blades in which a large number of inserts are arranged in a short pitch in the cutter body. Therefore, according to this cutter, it is possible to improve the efficiency of the cutter by increasing the number of blades as well as improving the chip discharging performance.

The cutter body of the cutter according to the present invention preferably has a second pocket surface formed on the opposite side of the first pocket across the insert.
According to this cutter, since the chip pocket is formed by the second pocket surface formed on the opposite side of the first pocket across the insert, the concave surface other than the rake face of the insert or the insert and the cutter body It is possible to suppress clogging of chips in the gap.

  ADVANTAGE OF THE INVENTION According to this invention, the cutter provided with the insert and insert which can improve a service life can be provided.

It is a perspective view which shows one Embodiment of the rotary cutting cutter which concerns on this invention. It is the figure which looked at the cutter of FIG. 1 from the front end side. It is a perspective view showing one embodiment of an insert concerning the present invention. It is a top view which shows the insert of FIG. It is a side view which shows the insert of FIG. It is a perspective view which shows a part of cutter of FIG. It is a perspective view which shows the state which removed the insert from the cutter of FIG. It is an expansion perspective view which shows a longitudinally oriented insert. It is an expansion perspective view which shows a sideways insert. It is a longitudinal cross-sectional view which shows the cutter of FIG. It is a perspective view which shows the 1st modification of the insert which concerns on this invention. It is a side view which shows the insert of FIG. It is a perspective view which shows the 2nd modification of the insert which concerns on this invention. It is a side view which shows the insert of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the rotary cutting cutter 1 according to this embodiment is a so-called face mill, and includes a disc-shaped cutter body 2 and ten inserts attached to the outer periphery of the tip of the cutter body 2. 3. The cutter body 2 has a mounting portion 4 provided at the rear end thereof attached to the main shaft of the milling machine and is driven to rotate in the direction of arrow R about the rotation axis C. In this rotary cutting cutter 1, the workpiece is planarly cut by the cutting blade of the insert 3 by moving on the workpiece while the cutter body 2 is rotationally driven.

[insert]
Hereinafter, the configuration of the insert 3 will be described. As shown in FIGS. 3 to 5, the insert 3 is a cutting tool made of a material such as cemented carbide or CBN and having a substantially pentagonal flat plate-like outer shape. An insertion hole 5 that penetrates the insert 3 in the thickness direction B shown in FIG. 5 is formed at the center of the insert 3, and the insert 3 is attached to the cutter body 2 by a clamp screw 6 that is inserted into the insertion hole 5. Fixed.

  The insert 3 includes a first main surface 7 and a second main surface 8 that face each other in the thickness direction B, and an outer peripheral side surface 9 formed between the first main surface 7 and the second main surface 8. ,have. The first main surface 7 and the second main surface 8 have the same shape, and generally have an outer shape formed by cutting out each corner of a regular pentagon in a fan shape.

  Convex surfaces 10 and concave surfaces 11 are alternately formed on the outer peripheral side surface 9 of the insert 3 in the circumferential direction S shown in FIG. The convex surface 10 and the concave surface 11 are formed at five locations corresponding to the shapes of the first main surface 7 and the second main surface 8.

  The convex surface 10 is a flat surface that protrudes in the radial direction of the insert 3 compared to the concave surface 11. The convex surface 10 has a rectangular outer shape when viewed from the front side of the insert shown in FIG. The concave surface 11 is a curved surface that is recessed in the radial direction of the insert 3 as compared with the convex surface 10, and connects the adjacent convex surfaces 10 with a gentle curve. The concave surface 11 forms a chip pocket for discharging chips generated during cutting to the outside of the cutter.

  In the insert 3, a first cutting edge 12 is formed as a ridge line between the adjacent convex surface 10 and concave surface 11. The second cutting edge 13 is formed as a ridge line between the concave surface 11 and the first main surface 7, and the third cutting edge 14 is formed as a ridge line between the concave surface 11 and the second main surface 8. Has been.

  Further, a first corner cutting edge CA is formed at the first corner where the first cutting edge 12 and the second cutting edge 13 intersect. The second corner cutting edge CB is formed at the second corner where the first cutting edge 12 and the third cutting edge 14 intersect. The first corner cutting edge CA and the second corner cutting edge CB are formed at two locations on one convex surface 10. That is, four corner cutting edges CA and CB are formed on one convex surface 10.

  The insert 3 has twenty corner cutting edges CA and CB formed on the five convex surfaces 10. The insert 3 is used as a corner used when a workpiece is cut, depending on the arrangement when any one of the twenty corner cutting edges CA and CB is attached to the cutter.

  According to this insert 3, since four corner cutting edges CA and CB can be formed per one convex surface 10, a large number of used corners can be secured within a limited dimensional setting value. Moreover, in this insert 3, the convex surface 10 and the concave surface 11 are alternately formed on the outer peripheral side surface 9, so that the concave surface 11 functions as a chip pocket for discharging chips to the outside, and chips are discharged. Can be improved.

  Further, since the concave surface 11 of the insert 3 functions as a chip pocket, the chip pocket formed in the cutter body 2 can be miniaturized. Cutting can be realized and the efficiency of the cutter 1 can be greatly improved. Furthermore, since the amount of work per insert during cutter cutting is reduced by increasing the number of blades, the amount of chip discharge and cutting vibration at the corners used can be suppressed, and the life of the corners used can be extended. Therefore, according to the insert 3, a large number of used corners can be secured, and the service life of the used corners can be extended by increasing the number of blades of the cutter 1. Therefore, the service life of the insert can be significantly improved. it can. By using the long-life insert 3, the frequency of replacement of the insert can be reduced, the maintenance burden on the user and the use cost can be greatly reduced, and the productivity of the user can be greatly improved. it can.

  Moreover, in this insert 3, it is preferable that the ratio of the width W of the concave surface 11 to the width T of the convex surface 10 is 1.2 to 2.0 with respect to the width T of the convex surface 10 and the width W of the concave surface 11 shown in FIG. . Here, the width T of the convex surface 10 is equal to the interval between the first corner cutting edges CA adjacent to each other across the convex surface 10, and the width W of the concave surface 11 is the interval between the first corner cutting blades CA adjacent to each other across the concave surface 11. be equivalent to. According to this configuration, if the width of the concave surface 11 on the outer peripheral side surface 9 is too wide, the chips are long and difficult to be discharged, and if too narrow, the chips are easily clogged. By setting it to 0, the width | variety of the concave surface which can divide a chip | tip easily can be formed, and the discharge | emission property of a chip | tip can be improved. The width of the convex surface 10 is determined according to design conditions such as the size of the insert 3 and the number of corners used.

[Cutter body]
Next, the configuration of the cutter body 2 will be described. As shown in FIGS. 2, 6, and 7, the disc-shaped cutter body 2 is provided with a vertical seating portion 20 and a lateral seating portion 21 to which the insert 3 is mounted. The vertical seating portion 20 and the horizontal seating portion 21 are provided at five points at equal intervals along the outer periphery of the tip of the cutter body 2. The seating portions 20 and 21 are not necessarily provided at regular intervals, and may be provided at different intervals. Further, the number of the seating portions 20 and 21 is not limited to five, but may be four or less, or may be six or more.

  The vertical seating portion 20 is a seating portion for mounting the insert 3 in a vertical posture. The vertical direction means a direction along the rotation axis C of the cutter body 2. The vertical seating portion 20 includes a vertical seating surface 22 that is a plane substantially parallel to the rotation axis C of the cutter body 2 and first to third vertical inner walls 23 to 25 that are perpendicular to the vertical seating surface 22. And have.

  A screw hole 22a for clamping is formed in the central portion of the vertical seating surface 22. By inserting the clamp screw 6 in a state where the insertion hole 5 of the insert 3 is aligned with the screw hole 22a, 3 is attached to the cutter body 2.

  The first to third vertical inner walls 23 to 25 are arranged so as to surround the inserted insert 3. Of the first to third longitudinal inner walls 23 to 25, the first longitudinal inner wall 23 and the second longitudinal inner wall 24 are arranged at positions sandwiching the insert 3, and the five included in the insert 3. The two contacts of the two convex surfaces 10 are brought into contact with each other to prevent the insert 3 from rotating or moving. The third vertical inner wall 25 is disposed at a position connecting the first vertical inner wall 23 and the second vertical inner wall 24.

  FIG. 7 shows an insert pinching angle α <b> 1 that is an angle at which the first vertical inner wall 23 and the second vertical inner wall 24 sandwich the insert 3. The insert pinching angle α1 is preferably set within a range of 60 ° to 80 °. If the insert pinching angle α1 formed by the first vertical inner wall 23 and the second vertical inner wall 24 is larger than 80 °, the insert 3 tends to rattle, and if it is less than 60 °, the insert pinching angle α1 is too narrow. By setting the angle to 60 ° to 80 °, it is possible to realize the stable mounting of the insert 3 with less shakiness.

  As shown in FIG. 8, the insert 3 is mounted in a vertical posture with respect to the vertical seating portion 20. The vertical posture is a posture in which the second main surface 8 of the insert 3 is in contact with the vertical seating surface 22 and the first main surface 7 is directed radially outward of the cutter body 2. In other words, the posture is such that the first main surface 7 and the second main surface 8 of the insert 3 are arranged along the rotation axis C. Further, the insert 3 has a posture in which one of the five convex surfaces 10 protrudes from the cutter body 2, that is, all the corner cutting edges CA and CB of the one convex surface 10 are outside the cutter body 2. Is mounted on the vertical seating portion 20 in a posture positioned at the position. By mounting in such a posture, cutting with the insert 3 having a characteristic configuration can be effectively performed.

  In the insert 3 shown in FIG. 8, the first corner cutting edge CA is used as the used corner E among the four corner cutting edges CA and CB located outside the cutter body 2. In this case, of the first cutting edge 12 and the second cutting edge 13 constituting the use corner E, the second cutting edge 13 directed toward the cutter outer periphery is the main cutting edge, and the first cutting edge directed toward the cutter tip side. 12 is used as a secondary cutting edge. Moreover, the 1st main surface 7 orient | assigned to the outer side of the cutter main body 2 becomes an outer periphery flank, and the concave surface 11 containing the use corner E becomes a rake face.

  In this case, by using the concave surface 11 as a rake surface, the first cutting edge 12 between the convex surface 10 and the concave surface 11 and the second cutting edge 13 between the concave surface 11 and the first main surface 7 are effectively utilized. can do. A part of the chips generated by the cutting of the cutting blade is curled well in the broken line area P of the concave surface 11 shown in FIG. 8, and is efficiently discharged to the outside of the cutter.

  As shown in FIGS. 7 and 8, a first pocket surface 31 and a second pocket surface 30 are provided on the outer periphery of the front end of the cutter body 2 so as to sandwich the longitudinal seating portion 20. The first pocket surface 31 and the second pocket surface 30 are surfaces that form a chip pocket for discharging chips to the outside.

  The first pocket surface 31 is provided on the rotation direction R side of the longitudinal seating portion 20 and forms a curved surface partially continuous with the concave surface 11 used as the rake face of the insert 3. The first pocket surface 31 is combined with the concave surface 11 used as a rake surface to form one chip pocket. The first pocket surface 31 is formed so as to surround the concave surface 11 in two directions of the insert 3 in the radial direction and the thickness direction.

  According to the cutter body 2, the first pocket surface 31 is combined with the concave surface 11 used as the rake face of the insert 3 to form a large chip pocket, thereby further improving chip discharge. . Moreover, since the first pocket surface 31 can be reduced in size as compared with the case where the chip pocket is formed only in the cutter body 2, it is possible to increase the number of blades by arranging a large number of inserts 3 at a short pitch in the cutter body 2. It is advantageous. Therefore, according to this cutter 1, while improving the discharge | emission property of a chip, the improvement of the efficiency of the cutter 1 by multi-blading is realizable.

  The second pocket surface 30 is provided on the opposite side of the first pocket surface 31 with the vertical seating portion 20 interposed therebetween. The second pocket surface 30 forms a small chip pocket including the concave surface 11 positioned opposite to the rake surface. The second pocket surface 30 forms a smaller pocket than the first pocket surface 31, but may form a larger pocket.

  Furthermore, in this cutter 1, since the chip pocket is formed by the second pocket surface 30 formed on the opposite side of the first pocket surface 31 with the insert 3 interposed therebetween, the concave surface 11 other than the rake face of the insert 3 The main purpose is to suppress the clogging of chips in the gap between the insert 3 and the cutter body 2.

  As shown in FIG. 7, the lateral seating portion 21 is a seating portion for mounting the insert 3 in a lateral posture. The lateral direction means a direction substantially perpendicular to the rotation axis C of the cutter body 2. The lateral seating portion 21 includes a lateral seating surface 26 that is a plane substantially perpendicular to the rotation axis C of the cutter body 2 and first to third lateral inner walls 27 to 29 perpendicular to the lateral seating surface 26. And have.

  A screw hole 26a for clamping is formed at the center of the lateral seating surface 26, and the clamp screw 6 is screwed in a state where the insertion hole 5 of the insert 3 is aligned with the screw hole 26a. 3 is attached to the cutter body 2.

  The first to third lateral inner walls 27 to 29 are arranged so as to surround the inserted insert 3. Of the first to third lateral inner walls 27 to 29, the first lateral inner wall 27 and the second lateral inner wall 28 are arranged at positions sandwiching the insert 3, and The two contacts of the two convex surfaces 10 are brought into contact with each other to prevent the insert 3 from rotating or moving. The third lateral inner wall 29 is disposed at a position connecting the first lateral inner wall 27 and the second lateral inner wall 28.

  FIG. 7 shows an insert pinching angle α2 that is an angle at which the first lateral inner wall 27 and the second lateral inner wall 28 sandwich the insert 3. The insert pinching angle α2 is preferably set within a range of 60 ° to 80 °. If the insert pinching angle α2 formed by the first lateral inner wall 27 and the second lateral inner wall 28 is greater than 80 °, the insert 3 tends to rattle, and if it is less than 60 °, the insert pinching angle α2 is too narrow. By setting the angle to 60 ° to 80 °, it is possible to realize the stable mounting of the insert 3 with less shakiness.

  As shown in FIG. 9, the insert 3 is mounted in a lateral posture with respect to the lateral seating portion 21. The horizontal posture is a posture in which the second main surface 8 of the insert 3 is in contact with the horizontal seating surface 26 and the first main surface 7 faces the front side of the cutter body 2. In other words, the posture is such that the first main surface 7 and the second main surface 8 of the insert 3 are arranged substantially perpendicular to the rotation axis C. Further, the insert 3 has a posture in which one of the five convex surfaces 10 protrudes from the cutter body 2, that is, all the corner cutting edges CA and CB of the one convex surface 10 are outside the cutter body 2. Is mounted on the lateral seating portion 21 in a posture positioned at the position. By mounting in such a posture, cutting with the insert 3 having a characteristic configuration can be effectively performed.

  In the insert 3 shown in FIG. 9, the first corner cutting edge CA is used as the use corner E among the four corner cutting edges CA and CB located outside the cutter body 2. In this case, of the first cutting edge 12 and the second cutting edge 13 constituting the use corner E, the first cutting edge 12 directed toward the cutter outer periphery is the main cutting edge, and the second cutting edge directed toward the cutter front end side. 13 is used as a secondary cutting edge. Further, the convex surface 10 directed to the outside of the cutter body 2 serves as an outer peripheral relief surface, and the concave surface 11 including the use corner E serves as a rake surface.

  According to this insert 3, the first cutting edge 12 between the convex surface 10 and the concave surface 11 and the second cutting edge 13 between the concave surface 11 and the first main surface 7 by using the concave surface 11 as a rake face. Can be used effectively. A part of the chips generated by the cutting of the cutting blade is curled well in the broken line area P of the concave surface 11 shown in FIG. 9, and is efficiently discharged to the outside of the cutter.

  As shown in FIGS. 7 and 9, a first pocket surface 33 and a second pocket surface 32 are provided on the outer periphery of the front end of the cutter body 2 so as to sandwich the lateral seating portion 21. The first pocket surface 33 and the second pocket surface 32 are surfaces that form chip pockets for discharging chips to the outside.

  The first pocket surface 33 is provided on the rotational direction R side of the lateral seating portion 21 and can also form a curved surface that is continuous with the concave surface 11 used as the rake face of the insert 3 depending on the posture of the insert 3 and the like. That is, the first pocket surface 33 can be combined with the concave surface 11 used as a rake surface to form one chip pocket. The first pocket surface 33 is formed so as to go around the insert 3 in two directions of the radial direction and the thickness direction of the insert 3.

  According to the cutter body 2, the first pocket surface 33 is combined with the concave surface 11 used as the rake face of the insert 3 to form a large chip pocket, thereby further improving chip dischargeability. .

  The second pocket surface 32 is provided on the opposite side of the first pocket surface 33 with the lateral seating portion 21 in between. The second pocket surface 32 forms a small chip pocket including the concave surface 11 positioned opposite to the rake surface. The second pocket surface 32 forms a smaller pocket than the first pocket surface 33, but may form a larger pocket.

  Furthermore, according to this cutter 1, since the chip pocket is formed by the second pocket surface 32 formed on the opposite side of the first pocket surface 33 with the insert 3 interposed therebetween, a concave surface other than the rake surface of the insert 3 is formed. 11 and the insert 3 and the cutter body 2 can be prevented from clogging with chips. Further, on the side surface of the cutter body 2 in the vicinity of the lateral seating portion 21, a cutting plane 34 for facilitating chip discharge is formed.

  According to the rotary cutting cutter 1 including the insert 3 and the cutter body 2 described above, since the insert 3 described above is provided, it is possible to realize a multi-blade arrangement in which a large number of inserts 3 are arranged at a short pitch. The efficiency of the cutter 1 can be improved. Moreover, according to this cutter 1, in addition to changing the rotational position and front and back of the insert 3, the seat 3 of the insert 3 is changed between the vertical seat 20 and the lateral seat 21, thereby All corner cutting edges CA and CB can be used sequentially. Therefore, according to the cutter 1, all the corner cutting edges CA and CB of the insert 3 can be used without waste, so that the service life of the insert 3 can be improved and the cost of using the insert 3 is increased. It can be reduced and the productivity of the user can be greatly improved.

  Further, the cutter 1 is configured such that the rotation locus of the vertical insert 3 and the rotation locus of the horizontal insert 3 overlap each other, and the overlap amount can be changed depending on the cut amount of the workpiece. Therefore, according to this cutter 1, since a desired cutting amount can be achieved only by changing the overlap amount, the design change cost related to the cutting amount can be greatly reduced, and the cutting amount that meets the user's needs. Can be provided.

  Further, as shown in FIGS. 1 and 10, a gripping recess N is provided on the back surface of the cutter body 2 so that an operator can hook a fingertip when handling the cutter. A plurality of gripping recesses N are provided at equal intervals along the outer periphery of the cutter body 2. Further, the back surface of the cutter body 2 is formed in a tapered shape that inclines toward the cutter tip side as it approaches the center mounting portion 4 from the outer periphery.

  According to such a configuration, the cutter 1 can be reliably gripped by hooking the fingertip onto the gripping recess N when handling the cutter. Specifically, the cutter 1 can be reliably gripped by supporting the front surface of the cutter with four fingers other than the thumb, placing the palm on the side of the cutter, and hooking the fingertip of the thumb on the gripping recess N.

  Moreover, since the back surface of the cutter body 2 is inclined toward the tip of the cutter as it approaches the central mounting portion 4, the thumb is greatly bent and hooked into the holding recess N, and the contact area between the cutter 1 and the hand To achieve a more secure grip. Therefore, according to this cutter 1, even when oil or the like is attached to the cutter 1, the cutter 1 can be securely gripped, so that the handleability of the cutter 1 is improved and the cutter is damaged by dropping. Can be prevented.

[First modification of insert]
FIG.11 and FIG.12 is a figure which shows the 1st modification of the insert which concerns on this invention. The insert 40 shown in FIGS. 11 and 12 is different from the insert 3 in that the outer peripheral side surface 41 has a breaker wall 44.

  In the insert 40 according to the first modification, a breaker wall 44 is formed as a part of the concave surface 43. The breaker walls 44 are formed at both ends of the concave surface 43 that intersect the convex surface 42. The convex surface 42 sandwiched between the breaker walls 44 has an outer shape in which two long sides of a rectangle are bent inwardly in a square shape when viewed from the side of the insert shown in FIG. ing.

  The breaker wall 44 is a dog-shaped wall having a bent portion at the center when viewed from the side of the insert shown in FIG. The breaker wall 44 is composed of two planes that intersect at the bent portion. The breaker wall 44 is formed as a wall substantially perpendicular to the convex surface 42.

  According to the insert 40 configured in this way, the same effect as the insert 3 can be obtained. In addition, a part of the chips generated by cutting the insert 40 hits the breaker wall 44 and is divided into short pieces, so that the chip discharge performance can be further improved, the cutting resistance is reduced, and the heating value of the cutting edge is reduced. Can be suppressed.

[Second modification of insert]
13 and 14 are views showing a second modification of the insert according to the present invention. The insert 50 shown in FIGS. 13 and 14 is different from the insert 3 in that the outer peripheral side surface 9 has a breaker 51.

  On the outer peripheral side surface 9 of the insert 50 according to the second modification, two hemispherical breakers 51 are formed for each concave surface 11. The breaker 51 is formed in front of the convex surface 10 and at the center of the concave surface 11 in the thickness direction B.

  Also in the insert 50 configured as described above, the same effect as that of the insert 3 can be obtained. Moreover, a part of the chips generated by cutting the insert 50 is bent by the breaker 51 and divided into short pieces, so that the chip discharge performance can be further improved.

  The present invention is not limited to the embodiment described above.

  For example, the cutter for rotary cutting according to the present invention may be an end mill in addition to a face mill, and the insert according to the present invention can be used for a bite in addition to a face mill and an end mill.

  Moreover, about the insert which concerns on this invention, the shape of a 1st main surface, a 2nd main surface, a convex surface, and a concave surface is not limited to what was mentioned above. These surfaces may be composed of a plurality of flat surfaces or curved surfaces, and may be provided with steps or protrusions. The number of convex surfaces on the outer peripheral side surface may be three or more. Further, the convex surfaces are not necessarily arranged at equal intervals in the circumferential direction.

  Furthermore, the insert may be composed of a plurality of materials and may be provided with various coatings.

  Moreover, about the cutter main body which concerns on this invention, the structure of a vertical direction seat part, a horizontal direction seat part, a 1st pocket surface, or a 2nd pocket surface is not limited to what was mentioned above. Further, the number and interval of the seating portions are appropriately selected according to the required specifications for the cutter. Furthermore, a coolant supply passage or the like may be provided in the cutter body.

  DESCRIPTION OF SYMBOLS 1 ... Rotary cutting cutter 2 ... Cutter main body 3,40,50 ... Insert 4 ... Mounting part 5 ... Insertion hole 6 ... Clamp screw 7 ... 1st main surface 8 ... 2nd main surface 9, 41 ... Outer peripheral side surface 10 42 ... convex surface 11, 43 ... concave surface 12 ... first cutting blade 13 ... second cutting blade 14 ... third cutting blade 20 ... longitudinal seating portion 21 ... lateral seating portion 23 ... first longitudinal inner wall 24 ... first 2 vertical inner walls 25 ... third vertical inner wall 27 ... first horizontal inner wall 28 ... second horizontal inner wall 29 ... third lateral inner wall 30, 32 ... first pocket surface 31, 33 ... first 2 pocket surface 44 ... breaker wall 51 ... breaker CA ... first corner cutting edge CB ... second corner cutting edge E ... used corner T ... convex surface width W ... concave surface width α1, α2 ... insert clamping angle

Claims (10)

A first main surface and a second main surface facing each other;
An outer peripheral side surface between the first main surface and the second main surface,
The outer peripheral side surface has convex surfaces and concave surfaces alternately formed in the circumferential direction,
The convex surface and the concave surface are formed at least three places,
In a corner where the ridge line between the first main surface and the concave surface and the ridge line between the convex surface and the concave surface intersect, a first corner cutting edge , a ridge line between the second main surface and the concave surface, A second corner cutting edge is formed at the corner where the ridge line between the convex surface and the concave surface intersects ,
The convex surface has two first corner cutting edges and two second corner cutting edges.
insert.   The insert according to claim 1, wherein a ratio of the width of the concave surface to the width of the convex surface on the outer peripheral side surface is 1.2 to 2.0.   The insert according to claim 1 or 2, wherein the concave surface is a rake surface.   The insert according to any one of claims 1 to 3, wherein the outer peripheral side surface has a breaker for dividing chips.   The insert according to any one of claims 1 to 4, wherein the convex surface and the concave surface are formed at five locations. A first main surface and a second main surface facing each other; and an outer peripheral side surface between the first main surface and the second main surface, wherein the outer peripheral side surfaces are alternately arranged in a circumferential direction. The convex surface and the concave surface are formed, and the convex surface and the concave surface are formed at least three locations, and a ridge line between the first main surface and the concave surface intersects with a ridge line between the convex surface and the concave surface. A corner is formed with a first corner cutting edge , and a second corner cutting edge is formed at a corner where a ridge line between the second main surface and the concave surface intersects with a ridge line between the convex surface and the concave surface, and the convex surface A plurality of inserts having two first corner cutting edges and two second corner cutting edges ;
A cutter body that rotates about a predetermined rotation axis;
A cutter for rotary cutting with
The cutter body is
A longitudinal seating portion provided on the outer periphery of the front end of the cutter body, wherein the insert is mounted in a posture in which the first main surface or the second main surface is directed radially outward of the cutter body;
A lateral seating portion provided on the outer periphery of the front end of the cutter body, wherein the insert is mounted in a posture in which the first main surface or the second main surface faces the front end side of the cutter body;
Having a cutter. The vertical seating portion has a first vertical inner wall and a second vertical inner wall sandwiching the insert attached to the vertical seating portion, the first vertical inner wall and the second vertical wall. The insert pinching angle formed by the vertical inner wall is 60 ° to 80 °,
The lateral seating portion has a first lateral inner wall and a second lateral inner wall sandwiching the insert attached to the lateral seating portion, the first lateral inner wall and the second lateral wall. The cutter according to claim 6, wherein an insert pinching angle formed by the lateral inner wall is 60 ° to 80 °.   The cutter according to claim 6 or 7, wherein the insert is attached to the longitudinal seating portion or the lateral seating portion in a posture in which the entire convex surface having a use corner projects from the cutter body.   The cutter according to any one of claims 6 to 8, wherein the cutter body has a first pocket surface that is combined with the concave surface forming the rake face of the insert to form one chip pocket. The cutter according to claim 9, wherein the cutter body has a second pocket surface formed on the opposite side of the first pocket surface across the insert.

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