JP3402187B2 - Indexable inserts and indexable cutting tools - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away tip (hereinafter sometimes referred to as a tip) and a throw-away type cutting tool such as an end mill to which the throw-away tip is attached.

[0002]

2. Description of the Related Art Conventionally, in a throw-away type end mill in which a plurality of indexable inserts, for example, two indexable inserts are attached to the tip of a tool body, the indexable end mill is disposed at a position close to an axis forming the center of rotation of the tool body. An inner blade tip and an outer blade tip arranged on the outer peripheral side of the tool body are provided.
For the inner blade tip, the front blade protruding from the tip surface of the tool body is positioned close to the axis, and for the outer blade tip, the front blade protruding from the tip surface of the tool body is positioned away from the axis and the corner is sandwiched. The outer peripheral blade is located on the outer peripheral side and projects from the outer peripheral surface of the tool body. When the tool body is rotated, the rotation loci of the two front blades are continuous.

[0003]

By the way, in such an end mill, there are some end mills that are mounted so that the corners can be changed to use two corners. However, in general, an inner blade tip is used. Since the shape of the front blade is different between the outer blade tip and the outer blade tip, two types of throw-away tips having different external shapes are used. For this reason, a plurality of types of throw-away tips are required as the tips to be mounted and the tips for replacement, and there is a drawback that the production costs of the tips and the running costs of the cutting tool become expensive.

In view of such circumstances, it is an object of the present invention to provide a throw-away tip having a plurality of types of cutting blades, each of which can have a different cutting blade. Another object of the present invention is to provide a cutting tool capable of disposing a plurality of types of cutting edges by using one type of throw-away tip.

[0005]

The throw-away tip according to the present invention has a substantially rectangular plate shape, and two opposing ridges among the ridges forming the four sides of one surface (upper surface) are not parallel. to another opposing Rutotomoni is the long blade and Tanha which is a cutting edge
The two sides are the first cutting edge and the second cutting edge, and the first corner and the second corner are two corners in one diagonal direction.
The long blade and the second cutting blade, the short blade and the first cutting blade intersect.
Are formed respectively, the corner angle of that is characterized by comprising the acute angle with each other. When this throw-away tip is attached to the tool body of a cutting tool, one tip projects one non-parallel cutting edge as the front edge from the tip of the tool body, and the other tip uses the other non-parallel cutting edge. For example, if the front blade is mounted so as to project from the tip of the tool body, a long blade and a short blade can be used as the front blade and the like by using a plurality of chips of one type. In addition, 2 in one diagonal direction
The two corner angles may be equal to each other, in which case the other two diagonal cutting edges will also be non-parallel. Also, the corner portion is a corner blade.

Further, the two corner portions in one diagonal direction are larger than the two corner portions in the other diagonal direction with respect to one surface (upper surface) and the other surface (lower surface), and Is formed on an inclined surface so that the distance from the other corner gradually decreases from the two corners in one diagonal direction toward the diagonal line connecting the two corners in the other diagonal direction. May be. Since the two corner portions in one diagonal direction, each of which forms an acute angle, have a larger wall thickness than the corner portions in the other diagonal direction, the cutting edge strength of these one diagonal corner portions is large. , By mounting one of these diagonal corners on the tip of the tool body, it improves the chipping resistance of one diagonal corner when biting, and increases the rake angle of the cutting edge. Therefore, the sharpness is improved. Further, the inclined surface may be a convex curved surface. The chip becomes thicker and the strength is improved. The inclined surface may be formed in a plane shape or a concave curved surface shape, or may be a twisted surface. A breaker may be provided on the rake face of the cutting edge including the inclined face.

The throw-away type cutting tool according to the present invention is a throw-away type cutting tool in which a plurality of throw-away tips each having a cutting edge projectingly arranged on the tip side are attached to the tip of the tool body. The away tip is the same throw-away tip according to any one of claims 1 to 4, and one throw-away tip is arranged such that a long blade that is one of the non-parallel cutting edges projects as a front blade from the tip of the tool body. , The first corner is outside the tip
Side, and the second cutting edge extends along the outer peripheral surface of the tool body.
The other throw-away tip is the non-parallel cutting edge, the short blade is the normal edge.
It is arranged as a face blade protruding from the tip of the tool body and has a second corner.
Part is located outside the tip, and the first blade is the tool body
It is characterized in that it is provided so as to project along the outer peripheral surface of the outer peripheral surface and serves as an outer peripheral blade . Two of the same chips facing each other
Since two non-parallel cutting blades can be attached to the tool body as, for example, front blades, and only one type of mounting tip and one replacement tip need be prepared, the cost can be reduced. Moreover, the non-parallel cutting edges facing each other are long and short, and the sharp corners are located outside the long or short blades located on the tip side of the tool body. The sharp corners on the outer peripheral side will bite, and the rotation speed on the outer peripheral side is high, so that damage to the corners can be suppressed. If the sharp corner portion is thick, the strength of the corner blade (corner portion) is high and the fracture resistance and the sharpness are improved. Further, the plurality of throw-away tips described above are arranged such that the non-parallel cutting edges arranged on the tip side are arranged in a centered manner, and at least one of the non-parallel cutting edges has an inner corner portion thereof as a rotation axis of the tool body. It may be formed so as to intersect so as to approach the other surface (seating surface), and in that case, the rake surface of the inner corner portion may be an inclined flat surface or a convex curved surface.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A throw-away tip and a throw-away type end mill according to an embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show a throw-away tip according to the first embodiment.
6 to 9 show a throw-away type end mill according to the first embodiment. 1 is a plan view of the throw-away tip, FIG. 2 is a side view of the throw-away tip shown in FIG. 1 in the A direction, FIG. 3 is a side view of the throw-away tip shown in FIG. 1 in the B direction, and FIG. 4 is a throw shown in FIG. FIG. 5 is a side view of a main part of an end mill equipped with an away tip, FIG. 5 is a side view of a main part of the end mill shown in FIG. 4 viewed from the outer peripheral blade side, and FIG. 6 is a front view of the end mill shown in FIG. A throw-away tip (hereinafter also referred to as a tip) 1 according to the embodiment shown in FIGS. 1 to 3 has a substantially rectangular plate shape, and an upper surface 3 is provided so as to face a lower surface 2 forming a seating surface. The two side surfaces 4 are provided so as to be gradually inclined outward from the lower surface 2 toward the upper surface 3 with an inclination angle (clearance angle) of 15 °, for example.
It is a positive chip. The chip 1 has a through hole 5 for bolting, which penetrates the lower surface 2 from the central portion of the upper surface 3.

The upper surface 3 and the lower surface 2 of the chip 1 are formed into a substantially parallel plate shape, and one of the four ridges of the upper surface 3 which forms two opposing edges is a relatively long blade 6. The other is a relatively short blade 7. The other two opposite sides are, for example, a first cutting edge 8 and a second cutting edge 9 longer than the long cutting edge 6.
It is said that. Moreover, the long blade 6 and the short blade 7 which face each other are not parallel to each other, and the other first and second cutting edges 8 and 9 which face each other are also non-parallel. The upper surface 3 is the rake face of each of the cutting edges 6, 7, 8, 9 and the side face 4 is the flank face. The first corner portion 10 and the second corner portion 11 in one diagonal direction of the upper surface 3 are formed by intersecting the long side 6 and the second cutting edge 9, the short side 7 and the first cutting edge 8, respectively. , Their corner angles are acute angles α (for example, α = 80 °), and the other diagonal third corner portion 12 and fourth corner portion 1
The corner angles of 3 are obtuse angles. The corner portions 10, 11, 12, and 13 form cutting edges. Further, the corner angles of the first and second corner portions 10 and 11 may not be equal. Further, in the plan view shown in FIG. 1, the crossing angle between the long blade 6 and the short blade 7 is, for example, 10 °, and the crossing angle between the first and second cutting edges 8 and 9 is, for example, 10 °.

The throw-away tip 1 according to the present embodiment is constructed as described above. Next, the end mill 20 having a plurality of the throw-away tips 1 mounted thereon will be described with reference to FIGS. 4 to 6. At the tip of the tool body 21 of the end mill 20, the axis O that forms the center of rotation
Two concave grooves 22 and 23 are provided so as to substantially face each other and have a substantially fan-shaped cross section. The concave grooves 22 and 23 are formed from the outer peripheral surface of the tool body 21 in the longitudinal direction to the tip surface 21a.
The chip mounting seat 24a is formed on the surface of the one concave groove 22 facing the rotation direction, and the chip mounting seat 24b is also formed on the other surface of the concave groove 23 facing the rotation direction. . Then, the above-mentioned throw-away tip 1 is mounted on one of the tip mounting seats 24a by projecting from the tip end surface 21a of the tool body 21 to the tip end side with the long blade 6 as the front blade, and this is the main tip 1A. The throw-away tip 1 is mounted on the other tip mounting seat 24b so as to project from the tip end surface 21a of the tool body 21 to the tip side with the short blade 7 as the front blade, and this is referred to as a sub-tip 1B.

In the main chip 1A, the first corner portion 10 is provided outside the tip, and the second cutting edge 9 is provided so as to protrude along the outer peripheral surface of the tool body 21 and to be substantially parallel to the axis O. The outer peripheral edge of the tool body 21, the tip surface 2 of the tool body 21
The long blade 6 protruding from 1a to the tip side is inclined at an angle α with respect to the axis O so as to gradually approach the base end side from the outer peripheral side toward the axis O direction, and forms an obtuse angle at the other end of the long blade 6. The corner portion 12 intersects the axis O. Therefore, the first cutting blade 8 located on the inner side and the side surface 4 thereof are gradually inclined outward at an inclination angle of, for example, 10 ° in the direction away from the axis O from the distal end side to the proximal end side. The sub-tip 1B has the second corner portion 11 arranged outside the tip, and the first cutting blade 8 is arranged so as to protrude along the outer peripheral surface of the tool body 21 and be substantially parallel to the axis O. Since the blade is a blade, the short blade 7 protruding from the tip surface 21a of the tool body 21 toward the tip side is inclined at an angle α so as to gradually approach the base side from the outer peripheral side in the direction of the axis O, and the short blade 7 The fourth corner portion 13 at the other end is separated from the axis O to the outside. Therefore, the second cutting edge 9 located on the inner side and the side surface 4 thereof are inclined inward at a tilt angle of, for example, 10 ° in a direction gradually approaching the axis O from the distal end side toward the proximal end side.

The main chip 1A and the sub chip 1B are mounted so that the second cutting blade 9 and the first cutting blade 8 forming the outer peripheral blades have positive axial rake angles as shown in FIG. (In FIG. 5, only the second cutting edge 9 is shown). Further, in the main chip 1A and the sub chip 1B, as shown in FIG. 6, the long blades 6 and the short blades 7 forming the front blades are located on a radial line centered on the axis O, and the radial rake angle is 0 °. Has been done.

Since the throw-away tip 1 and the end mill 20 according to this embodiment are configured as described above, if the tool body 21 is rotated around the axis O to cut the work material, the tool body 21 The long blades 6 and the short blades 7 protruding toward the tip side bite into the work material at the corner portions 10 and 11 on the outer peripheral side. Since this region rotates at a higher speed than the vicinity of the axis O, cutting at the time of biting It has low resistance and can cut and cut without causing defects. Further, by feeding the tool body 21 to the tip side in the direction of the axis O, the long blade 6 and the short blade 7 whose rotation loci overlap each other can perform rotary cutting like a drill. Further, by feeding the tool main body 21 in the lateral direction, while performing feed cutting with the first cutting blade 8 and the second cutting blade 9 forming the outer peripheral blade, finish cutting processing is performed at the corner portions 10 and 11 of the long blade 6 and the short blade 7. it can. Then, even if the cutting edge of any of the chips 1A and 1B is broken or worn, the same throw-away chip 1 may be replaced and mounted.

As described above, according to this embodiment, the long blade 6 and the short blade 7 can be attached to the tool body 21 as different types of cutting edges by providing a plurality of the same tips 1. Since a plurality of cutting blades of different types can be arranged and configured with the type of tip 1, and only one type of replacement tip needs to be stored, the manufacturing cost of the tip and the running cost of the cutting tool are reduced. Moreover, since the corner angles of the first and second corner portions 10 and 11 facing each other are acute, the inner side surface 4 of the sub-chip 1B in the mounted state gradually extends from the tip end of the tool body 21 toward the base end side. Even if it is inclined to the O side, the inner side surface 4 of the main tip 1A is inclined from the tip of the tool body 21 toward the base end gradually in the direction away from the axis O. The thickness of the center portion 26 of the tip of the tool body 21 that is sandwiched can be equally ensured along the axis O, and the rigidity of the tool body 21 can be ensured.

Next, a second embodiment of the present invention will be described with reference to FIGS. 7 to 12. The same reference numerals are used for the same or similar parts as those of the first embodiment described above, and the description thereof will be given. Omit it. 7 is a plan view of the throw-away tip according to the second embodiment, FIG. 8 is a side view of the throw-away tip shown in FIG. 7 in the A direction, and FIG. 9 is a side view of the throw-away tip shown in FIG. 7 in the B direction. 10 is a side view of a main part of the end mill equipped with the throw-away tip shown in FIG. 7, FIG.
Is a side view of the essential parts of the end mill as seen from the outer peripheral blade side, and FIG. 12 is a front view of the end mill shown in FIG. 7. The throw-away tip (hereinafter, also referred to as a tip) 30 according to the second embodiment shown in FIGS. 7 to 9 is a substantially rectangular plate-like shape having the same shape as the tip 1 according to the first embodiment in plan view. And the upper surface 3 facing the lower surface 2 forming the seating surface,
The first and second corner portions 31 and 32 having a corner angle of an acute angle α located in one diagonal direction in a plan view, and the third and the third corner portions having two obtuse corner angles located in the other diagonal direction. Four corner portions 33 and 34 are provided.

Moreover, the first and second corner portions 31, 32
Is the third and fourth corner portions 33, 34 (height hb, h
The height from the lower surface 2 is higher than that in b), and the heights ha and ha are the same. Then, on the upper surface 3, with respect to the diagonal line L connecting the third and fourth corner portions 33 and 34, the distance from the first and second corner portions 31 and 32 to the lower surface 2 gradually decreases toward the diagonal line L. Thus, for example, flat inclined surfaces 35a and 35b are formed, one inclined surface 35a is a rake surface of the long blade 6 and the second cutting edge 9, and the other inclined surface 35b is the short blade 7 and the first blade. It is the rake face of the cutting edge 8. Therefore, in the throw-away tip 30, the first and second corner portions 31 and 32 have the maximum wall thickness, and the portion along the diagonal line L connecting the obtuse corner portions 33 and 34 has the minimum wall thickness.

The throw-away tip 30 according to this embodiment has the above-mentioned structure. Next, the end mill 40 to which the throw-away tip 30 is attached is shown in FIG.
This will be described with reference to FIGS. At the tip of the tool body 21 of the end mill 40, one of the tip mounting seats 24a and 24b provided on the surfaces of the concave grooves 22 and 23 facing the rotation direction has one of the above-mentioned throw-away tips. 30 is the long blade 6 and the tip surface 21a of the tool body 21
The first cutting edge 9 is mounted so that the thick first corner portion 31 is located on the outer peripheral side of the tip and the second cutting edge 9 is an outer peripheral blade. This is the main chip 30A
And On the other tip mounting seat 24b, the throw-away tip 30 causes the short blade 7 to project from the tip surface 21a of the tool body 21 to the tip side as a front blade, and the thick second corner portion 32 is positioned on the tip outer peripheral side. The first blade 8 is an outer peripheral blade. This is referred to as a sub chip 30B. In this case, in the main chip 30A, the first corner portion 31 located outside the tip has a large thickness,
The strength of the blade of the corner portion 31 is large and the fracture resistance at the time of biting is high. Further, in the sub chip 30B, the second corner portion 32 located on the outer side of the tip has a large thickness, and thus the blade of the corner portion 32 has a large strength and is highly resistant to chipping when biting.

Since the throw-away tip 30 and the end mill 40 according to the second embodiment have the above-mentioned constructions, in addition to the effects of the first embodiment,
The throw-away tip 30 is attached to the tool body 21, and the first and second corner portions 3 located on the outer side of the tip end.
Since the wall thicknesses of 1 and 32 are larger than the third and fourth corner portions 33 and 34, the strength of the blade is high. Moreover, since the diagonal first and second corner portions 31 and 32 of the chip 30 have the same height, the upper surface 3 is brought into contact with a flat jig when the lower surface 2 is polished during chip manufacture. If so, the flatness of the lower surface 2 can be easily obtained and the polishing accuracy is high. Moreover, with the throw-away tip 30 mounted on the end mill 40, the corners are large because the first and second corners 31 and 32 of the main and sub-tips 30A and 30B that bite into the work material at the start of cutting are thick. High fracture resistance of the blade.
Further, the second cutting edge 9 and the first cutting edge 8 forming the outer peripheral edge have the acute first and second corner portions 31 on the distal end side with respect to the obtuse fourth and third corner portions 34, 33 on the proximal end side. , 32 has a larger wall thickness, the axial rake angle is larger than that of the first embodiment, and the sharpness of the outer peripheral cutting is improved.

Although the inclined surfaces 35a and 35b are flat in the above-described second embodiment, they may be convex curved surfaces or concave curved surface shapes instead of the inclined surfaces 35a, 35b. The strength of the cutting edge is further increased, and the cutting edge angle of the cutting edge is increased to improve the cutting edge strength. In addition, when the concave curved surface is formed, the rake angle of the cutting edge is increased and the sharpness is further improved. Alternatively, it may be a twisted surface, and in this case, the rake angle of the outer peripheral blade (first cutting blade 8 and second cutting blade 9) gradually changes from the distal end side toward the proximal end side. A breaker groove may be provided on the upper surface 3. In the first and second embodiments, each throw-away tip 1A, 1B, 30A, 3
As shown in FIGS. 6 and 12, 0B is mounted so that the long blade 6 and the short blade 7 are located on the radius line of the tool main body 21 passing through the axis O and the radial rake angle is 0 °. Instead of this, the long blade 6 and the short blade 7 may be arranged at the positions where the center is raised or the center is lowered. In this case, uncut (core residue) occurs in the portion sandwiched between the two chips during cutting, but if the thickness of the work material in the core residue is small, it can be peeled off with an end mill. Also, if it is fed laterally, it is possible to scrape off the uncut portion.

Alternatively, as shown in FIG. 13, a chip 30A '
The long blades 6 (short blades 7) of (30B ') are arranged so as to be centered, and at the end portions of the long blades 6 on the side of the third corner portion 33 located on the axis O side, have a substantially arc shape toward the lower surface 2. It may be curved to form an R-shaped cutting edge so as to intersect the axis O. Alternatively, as shown in FIG. 14 and FIG.
The long blades 6 and the short blades 7 of A ′ and 1B ′ are arranged to be centered, and the long blades 6 have a third corner portion 12 on the inner side of the upper surface 3 intersecting the axis O directed toward the tip side of the corner portion. Is formed as a flat inclined portion 42 that gradually approaches the lower surface 2, and the inner region 6a of the long blade 6 that forms the ridgeline on the tip side of the inclined portion 42 gradually inclines toward the lower surface 2 side from the centered position and forms the axis O. You will cross. By adopting the configuration of FIG. 13 and the configurations of FIG. 14 and FIG. 15 as described above, when the tool main body 21 of the end mills 20 and 40 has a small diameter, it is inevitable to secure the rigidity of the tip mounting seat portion. 1A ', 1B', 3
It is necessary to dispose 0A 'and 30B' in a center-up position, and even in that case, cutting can be performed near the rotation axis O. In this case, since the cutting amount is small in the portion near the axis O of the long blade 6,
It will never be lost.

Further, although the acute-angled first and second corner portions 10, 11, 31, 32 have the same corner angle α in the first and second embodiments, they do not necessarily have to be the same. In addition, in each of the throw-away tips 1 and 30 in the above-described first and second embodiments, the long blade 6, the short blade 7, the first cutting blade 8, and the second cutting blade 9 are linear, but Instead of this, a convex curve shape or a concave curve shape may be used. Further, in each of the above-described embodiments, the two throw-away tips 1 and 30 are attached to the tool body 21 of the end mills 20 and 40, but the present invention is not limited to this, and three or more tips 1, 1. You may equip 30 and may cut with each cutting edge. Further, the throw-away tip according to the present invention is not limited to the end mills 20 and 40, and can be mounted on various types of cutting tools such as other types of rolling tools and turning tools.

[0022]

As described above, the throw-away tip according to the present invention has a substantially quadrangular plate shape, and among two ridges forming the four sides of one surface, two opposing ridges are not parallel to each other. two sides Rutotomoni other facing is a long blade and Tanha, which is a blade
Is a first change blade and the second cutting edge, the first corner portion are two corners of one diagonal direction, the second corner portion, the length
The blade and the second cutting edge, the short blade and the first blade intersect each other.
Is formed, since the corner angle of that is an acute angle with each other, when mounting the cutting insert to a tool body of a cutting tool, the first chip tool body a non-parallel one cutting edge, for example, as a front edge If you attach it by projecting from the tip, and the other tip is installed by projecting from the tip of the tool body with the other non-parallel cutting edge, for example as the front blade, you can arrange multiple types of cutting edges using multiple one type of tips. It can be used as a front blade, etc., and at that time, the distance between multiple throw-away tips does not narrow in the axial direction, so the wall thickness of the center of the tip of the tool body sandwiched by both tips can be secured and tool rigidity is improved. high.

Further, the distance between the two corner portions in one diagonal direction is larger than the distance between the two corner portions in the other diagonal direction and the other surface opposed to the one surface. The two corners in the diagonal direction have a larger distance from the other surface than the two corners in the other diagonal direction, and moreover, the two corners in one diagonal direction to the two corners in the other diagonal direction. Since it is formed on the inclined surface so that the distance to the other surface gradually decreases toward the diagonal line connecting the two, the cutting edge strength of the two corner portions in one diagonal direction is large, and these corner portions are By being attached to the tip of the tool body,
The breakage resistance of these corners at the time of biting is improved, and the rake angle of each cutting edge connected to the corners is increased, so that the sharpness is improved. Moreover, since the inclined surface is a convex curved surface, the thickness of the chip is increased and the strength is improved.

In the throw-away cutting tool according to the present invention, a plurality of throw-away tips are the same throw-away tip according to any one of claims 1 to 4, and one throw-away tip is one of the non-parallel cutting tips. A long blade that is a blade is arranged as a front blade protruding from the tip of the tool body .
One corner is located outside the tip, and the second cutting edge is
It is arranged so as to project along the outer peripheral surface of the tool body and
The other throw-away tip has a short blade that is the other non-parallel cutting edge and is arranged as a front blade so as to project from the tip of the tool body , and the second corner portion is arranged outside the tip.
In addition, the first blade is arranged so as to project along the outer peripheral surface of the tool body.
Since it is provided as an outer peripheral blade, it is possible to attach a plurality of facing non-parallel cutting blades of the same chip to the tool body as front blades, for example, and it is low cost, and at the time of cutting, each of the sharp edges has a sharp angle. Since it bites at the corner, it is possible to suppress the loss of the corner.

[Brief description of drawings]

FIG. 1 is a plan view of a throw-away tip according to a first embodiment of the present invention.

FIG. 2 is a side view of the throw-away tip shown in FIG. 1 viewed from the direction A.

FIG. 3 is a side view of the throw-away tip shown in FIG. 1 viewed from the direction B.

FIG. 4 is a side view of a main part of an end mill to which the throw-away tip shown in FIG. 1 is attached.

5 is a side view of the end mill shown in FIG. 4 viewed from the direction of the outer peripheral blade.

FIG. 6 is a front view of the end mill shown in FIG.

FIG. 7 is a plan view of a throw-away tip according to a second embodiment of the present invention.

8 is a side view of the throw-away tip shown in FIG. 7 as seen from the direction A. FIG.

9 is a side view of the throw-away tip shown in FIG. 7 viewed from the direction B. FIG.

10 is a side view of the essential parts of the end mill to which the throw-away tip shown in FIG. 7 is attached.

FIG. 11 is a side view of the end mill shown in FIG. 7 viewed from the direction of the outer peripheral blade.

FIG. 12 is a front view of the end mill shown in FIG. 7.

FIG. 13 is a front view showing a modified example in which the throw-away tip according to the second embodiment is attached to the end mill.

FIG. 14 is a front view of essential parts showing a modified example of a state where the throw-away tip according to the first embodiment is attached to the end mill.

FIG. 15 is a front view of the end mill shown in FIG. 14.

[Explanation of symbols]

1,30 throw-away tip 1A, 1A ', 30A, 30A' Main chip 1B, 1B ', 30B, 30B' Sub-chip 6 long blade 7 short blade 10 First Corner 11 Second Corner 12 Third Corner 13 Fourth Corner 20,40 end mill 21 Tool body 26 Center of tip L diagonal

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-9-272002 (JP, A) JP-A-7-237027 (JP, A) Actually open 5-85511 (JP, U) Actually open 63- 124416 (JP, U) Special table 10-510480 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B23B 27/00 B23B 27/14 B23C 5/10

Claims (5)

(57) [Claims] 1. A have a substantially square plate shape, long blade and Tanha and is Rutotomoni other with two edges sides non-parallel cutting edge facing out of Ryohen forming the four sides of one surface Opponent
The two sides are the first cutting edge and the second cutting edge, and the first corner is the two corners in one diagonal direction.
Part, the second corner part, the long blade and the second cutting edge, the front
The short blade and the first blade are formed to intersect each other,
As a corner angle of the throw-away tip formed by an acute angle with each other. 2. The throw-away tip according to claim 1, wherein the two diagonal corner angles are equal to each other. 3. The distance between the two diagonally opposite corners is greater than the distance between the other diagonally opposite two corners, and the one surface is , From one of the two diagonal corners to the other diagonal of the two diagonal corners,
The throw-away tip according to claim 1 or 2, wherein the throw-away tip is formed on an inclined surface so that the distance from the other surface gradually decreases. 4. The throw-away tip according to claim 3, wherein the inclined surface is a convex curved surface. 5. A throw-away type cutting tool in which a plurality of throw-away tips each having a cutting edge projecting toward the tip side are attached to the tip of the tool body, wherein the plurality of throw-away tips are provided. The same throw-away tip according to any one of 1 to 4, wherein the throw-away tip of 1 is arranged such that the long blade, which is one of the non-parallel cutting edges, projects from the tool body tip as a front blade, The corner is located outside the tip,
Moreover, the second cutting edge projects along the outer peripheral surface of the tool body.
Is arranged as an outer peripheral blade, the other throw-away tip is arranged such that the short blade, which is the other non-parallel cutting edge, protrudes from the tool body tip as a front blade , and the second corner portion is Located outside the tip,
Moreover, the first cutting edge projects along the outer peripheral surface of the tool body.
Indexable cutting tool, characterized in that disposed is an outer peripheral edge Te.