JP2001121341A - Throw away tip and throw away type cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To project the outer circumferential side corner blades of respective front face blades using one kind of a tip, and let the rotary locus of each outer circumferential blade be piled with plural tips. SOLUTION: A tip 1 is roughly in a quadrangle disc shape, and two paired cutting blades are provided for its top face 3 so as to be formed into a first and a second short blade 6 and 7, and a first and a second long blade 8 and 9 respectively. Each corner angle of two corner blades holding the first short blade 6 shall not be greater than 90 deg., the other corner blade 11 shall not be greater than 90 deg., and each corner blade 13 shall be of an obtuse angle. One of two identical tips 1 and 2 projecting to the tip end side of a tool main body 21 turns the second long blade 9 into a front face blade, and furthermore turns the first short blade 6 into an outer circumferential blade, and the other turns the first short blade 6 into the front face blade, and furthermore turns the first long blade 8 into the outer circumferential blade, so that let corner blades 10 and 12 held by those as mentioned above be projected to the outer circumferential side.

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 mounted.

[0002]

2. Description of the Related Art Conventionally, in a throw-away type end mill in which a plurality of, for example, two parallelogram plate-like indexable inserts are mounted on the tip of a tool body, and one of the inserts has a long blade, Are arranged so that the front blade is the front blade and the short blade is the outer peripheral blade, and the other chip is arranged so that the short blade is the front blade and the long blade is the outer blade. In this case, if the two chips are of the same shape and size, it is convenient for chip management and replacement use. However, in such an end mill, when the outer peripheral edge is arranged along the rotation axis of the tool body and used for shoulder milling or drilling, for example, the front edge of one of the tips is replaced with the outer peripheral corner edge. If it is arranged so as to protrude toward the tip and gradually recede toward the base end toward the inside, the front blade of the other chip will have the inner corner blade projecting more toward the tip side than the outer corner blade, and the There is a disadvantage that it is easily lost due to In order to avoid this drawback, when the front blade of the other chip is arranged in the radial direction so that the inner corner blade does not protrude to the tip side, the outer blade of the other chip is directed more inward than the outer blade of one chip. Since the outer peripheral blade is not inclined and does not function as an outer peripheral blade, the outer peripheral blade is cut by one blade of one of the chips.

[0003] An end mill disclosed in Japanese Patent Application Laid-Open No. Hei 10-291115 is an invention intended to improve such disadvantages. In this end mill, two types of parallelogram plate-shaped tips that are axisymmetric and opposite sides are used, and the short edge of one tip is used as the front edge, and the long edge of the other tip is used as the front edge. An arrangement is adopted in which the corner blade on the outer peripheral side of the front blade protrudes toward the distal end side from the inner corner blade. It is stated that the cutting process can be performed by using the outer peripheral side corner blade as two blades, thereby suppressing the loss of the outer peripheral side corner blade and improving the cutting efficiency.

[0004]

However, in such an end mill, two types of chips each having a different external shape must be prepared, and management and replacement use are complicated, and running costs are high. There is a disadvantage that the manufacturing cost of the chip increases. The present invention
In view of such circumstances, an object of the present invention is to provide a throwaway tip including a plurality of types of cutting blades in which different cutting blades can be arranged. Another object of the present invention is to provide:
An object of the present invention is to provide a cutting tool in which outer peripheral corner blades can be arranged to protrude toward the distal end side using various types of throw-away tips.

[0005]

The indexable insert (1, 40) according to the present invention has a substantially rectangular plate shape, and has one of two corner blades (10, 10) adjacent to one surface (3). The corner angle of 12) is set to 90 ° or less, and one of the two opposing ridges including these corner blades is a non-parallel cutting blade (8, 9). When a plurality of such throw-away tips are used and one of the corner blades (10, 12) is disposed at the tip of the tool body so as to be located on the outer peripheral side of the tip, each corner blade (10, 12) is sandwiched. When the first cutting edge is disposed as an outer peripheral edge along the rotation axis of the tool body, the other cutting edges sandwiching the corner blade are inclined frontward from the outer peripheral side toward the base end side as a frontal blade. The outer peripheral edge and the outer peripheral side corner blade can be arranged as two blades, so that they are not easily broken, have high cutting efficiency, and can easily store chips.

[0006] The other two corner blades (1
One of (1, 13) may have a corner angle of 90 ° or less. When the tip is mounted on the tool body, the thickness of the peripheral portion of the tip of the tool body can be secured and the strength is high. Further, the other two edges of one surface may be non-parallel cutting blades (6, 7). In this case as well, the thickness of the tool body at the peripheral portion of the tip can be ensured, and the strength is high. The two pairs of non-parallel cutting blades (6, 7, 8, 9) facing each other have a distance from the seating surface (2) facing one surface gradually changing from one end to the other end. It may be inclined. The thickness of the back surface of the tip mounting seat of the tool main body can be increased or the radial rake angle and the axial rake angle of the cutting edge can be set large depending on the mounting posture of the insert with respect to the tool main body, so that sharpness can be improved. The angle of inclination of each cutting edge and the distance from the seating surface may be different from each other, or may be the same for each pair of opposing cutting edges, and are arbitrary. Further, one of the other two corner blades of the one surface has a corner angle of 90 ° or less, and among the cutting blades including the corner blade (11), includes the corner blade (12) and is a long blade. Cutting blade (9)
In the above, at the end portion including the corner blade (12), a sub-cutting edge which is inclined with respect to another portion so as to retreat inside one surface as approaching the corner blade (12) may be formed. The secondary cutting edge (97) acts on the cutting when the cutting edge (9) is used as the front edge, and when the cutting edge (9) is used as the outer peripheral edge, the other cutting edge is used as a tool. Since the cutting edge (9) escapes to the inner peripheral side of the main body and does not act on the cutting of the work material, the auxiliary cutting edge (9) when the cutting edge (9) is used as the outer peripheral edge is used.
7) The progress of abrasion can be prevented, and the sharpness of the sub cutting edge when used as a front blade can be ensured.

[0007] The indexable cutting tool according to the present invention is characterized in that the indexable cutting tool is provided with a plurality of indexable inserts, each of which has a cutting edge protruding from the tip end of the tool body and is mounted on the tip end thereof. Is the same throwaway insert (1, 40) according to any one of claims 1 to 4, and the plurality of throwaway inserts have one adjacent two corner blades (10, 12) in the tool body. Are arranged so as to protrude from the outer peripheral side of the distal end. If one of the two corner blades (10, 12) is arranged on the outer peripheral side of the tip of the tool body, cutting can be started from the outer peripheral corner blade when drilling or the like, and chipping can be suppressed, and shoulder cutting can be performed. In the machining of grooves or grooves, finishing can be performed with the corner blade on the outer peripheral side of the tip while shaving the shoulder with the outer peripheral blade.

The throw-away tip, in which one corner blade (12) protrudes toward the outer periphery of the tip of the tool body, has a cutting blade (9) extending radially inward of the tool body from the corner blade (12). It may extend to the axis. Cutting can be reliably performed without leaving a core in drilling or the like. One of the two non-parallel cutting blades of the indexable insert is a long blade (8, 9), and the other two non-parallel cutting blades are short blades (6, 7). A plurality of throw-away tips (1,
One (1A, 40A) of 40) has a long blade (9) as a front blade and a short blade (6) as an outer blade, and the other (1B, 40B) has a short blade (6) as a front blade and a long blade. (8) may be provided at the tip of the tool body as outer peripheral blades. Using a plurality of identical chips, the corner blades (10, 12) on the outer peripheral side of the distal end of each chip can be arranged as two blades by protruding toward the distal end side. Etc. are also easy. In addition, the same throwaway insert (1C, 1D, 40C, 40C) having a long blade (9, 8) as an outer peripheral edge is provided at the base end side of one throwaway insert on the tool body.
40D) may be provided so that the rotation trajectories of the outer peripheral blades overlap when the tool body is rotated around the rotation axis. The same insert is sequentially stacked from the distal end side to the base end side of the tool main body, so that the rotation trajectories of the respective outer peripheral blades can be overlapped, which can be adopted for deep hole drilling. A throw-away cutting tool according to the present invention is a throw-away cutting tool in which a plurality of throw-away tips, each of which has a cutting edge protruding and disposed on the tip side, are attached to the tip of the tool body, a plurality of throw-away cutting tools are provided. The inserts are the same indexable inserts (96) according to claim 5, one of the indexable inserts being a long edge (9) having a minor cutting edge (97), a front edge and a short edge (6). And the long blade (9) is arranged such that the sub cutting edge (97) projects toward the tool tip side from the other part of the long blade (9). The same indexable insert having the long blades (8, 9) as the outer peripheral blades is disposed on the base end side so that when the tool body is rotated around the rotation axis, the rotation trajectories of the respective outer peripheral blades overlap. Are located and others When the long blade (9) is used as the outer peripheral edge of the indexable insert, the auxiliary cutting edge (97) is positioned closer to the inner peripheral side of the tool than the other portion of the long blade (9), and acts on the cutting of the work material. It is characterized by being arranged not to be. The secondary cutting edge (97) is a long blade (9)
When used as a front blade, it can be used for finish cutting, and when the long blade (9) is used as an outer peripheral blade, it escapes to the inner peripheral side of the tool body with respect to other portions of the long blade (9). And does not act on the cutting of the work material, so that the progress of wear of the sub cutting edge (97) when the long blade (9) is used as the outer peripheral blade is prevented, and the sub cutting edge when used as the front blade. Sharpness can be ensured. In addition, in this throw-away type cutting tool, a secondary cutting edge (9) is used as an outer peripheral edge of the throw-away tip located closest to the base end of the tool body.
By using the long blade (8) in which 7) is not formed,
The maximum cutting depth of the indexable cutting tool can be ensured while forming the sub cutting edge (97) on the long blade (9).

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a throw-away insert and a throw-away type end mill according to an embodiment of the present invention. FIG. 1 shows a throw-away tip according to the first embodiment, and FIGS.
1 shows a throw-away type end mill according to the first embodiment. 1A is a plan view of the throw away tip, FIG. 1B is a side view of the throw away tip shown in FIG. 1A in the direction A, FIG. 1C is a side view of the throw away tip similarly, and FIG. 2 is a throw away tip shown in FIG. FIG. 3 is a front view of the end mill shown in FIG. 2; FIG.
FIG. 4 is a side view of a main part of the end mill shown in FIG. A throw-away tip (hereinafter sometimes referred to as a tip) 1 according to the embodiment shown in FIG. 1 is formed in a substantially rectangular plate shape, and an upper face 3 opposes a lower face 2 forming a seating surface.
And the four side surfaces 4 are provided so as to be gradually inclined outward from the lower surface 2 toward the upper surface 3 with a regular inclination angle (relief angle), and are positive chips. Chip 1 has
An insertion hole 5 for bolting is formed through the lower surface 2 from the center of the upper surface 3.

The upper surface 3 and the lower surface 2 of the chip 1 are formed in a substantially parallel plate shape, and a pair of opposing ridges on the upper surface 3 are short blades and long blades, thereby forming short blades. 2
One of the cutting blades is a relatively short first short blade 6, and the other is a relatively short second short blade 7. The other two opposite sides constituting the long blade are, for example, a first long blade 8 longer than the first short blade 6.
And the second long blade 9. Moreover, the opposing first short blade 6
And the second short blades 7 are non-parallel to each other, and the other opposing first and second long blades 8, 9 are also non-parallel. The upper surface 3 is a rake face of each of the cutting blades 6, 7, 8, and 9, and each side face 4 is a flank. The first corner blade 10 and the second corner blade 11 in one diagonal direction of the upper surface 3 are connected to the first short blade 6.
And the first long blade 8, the second short blade 7 and the second long blade 9 are formed so as to intersect with each other, and their corner angles are each 90 ° or less, preferably an acute angle, and the first short blade in the other diagonal direction is formed. The third corner blade 12 composed of the blade 6 and the second long blade 9 is 90 °
Hereinafter, preferably, the corner angle of the fourth corner blade 13 including the second short blade 7 and the first long blade 8 is an obtuse angle. The corner angles of the first to third corner blades 10, 11, 12 may or may not be equal.

The indexable insert 1 according to the present embodiment is configured as described above. Next, an end mill 20 on which a plurality of indexable inserts 1 are mounted will be described with reference to FIGS. At the tip of the tool body 21 of the end mill 20, two concave grooves 22 and 23 are provided, which are substantially opposed to the rotation axis O which forms the center of rotation and are cut out in a substantially fan-shaped cross section. Each groove 22, 23
From the outer peripheral surface in the longitudinal direction of the tool body 21 to the tip surface 2
1a, a chip mounting seat 24a is formed on the surface of one of the grooves 22 that faces in the rotation direction, and the chip mounting seat 24 is formed on the surface of the other groove 23 that faces in the rotation direction.
b is formed. Then, one of the chip mounting seats 24
The above-mentioned indexable insert 1 is attached to a with the second long blade 9 as a front blade, protruding from the distal end surface 21a of the tool body 21 to the distal end side, and this is referred to as a main insert 1A. On the other tip mounting seat 24b, the throw-away tip 1 uses the first short blade 6 as a front blade, and the distal end surface 21a of the tool body 21.
From the tip of the sub chip 1B
And Note that a state in which the first and second long blades 8 and 9 are arranged in a direction intersecting the rotation axis O as in the main chip 1A is laterally arranged, and the first and second long blades 8 and 9 are as in the sub chip 1B. A state in which 9 is arranged in a direction along the rotation axis O is referred to as a vertical arrangement.

The main tip 1A is provided such that the third corner blade 12 is disposed outside the distal end, and the first short blade 6 projects along the outer peripheral surface of the tool body 21 and is substantially parallel to the rotation axis O. The second long blade 9 protruding from the distal end surface 21a of the tool body 21 to the distal end side so as to gradually approach the base end side from the outer peripheral side toward the rotational axis O direction. Is inclined at an angle α (for example, α = 5 °), the second corner blade 11 at the other end of the second long blade 9 forming an acute angle is located on the opposite side to the rotation axis O, and the second short blade 7 is It intersects with the rotation axis O. In addition, the sub-tip 1B is provided such that the first corner blade 10 is disposed outside the distal end, and the first long blade 8 protrudes along the outer peripheral surface of the tool body 21 and is substantially parallel to the rotation axis O. Because of the outer peripheral edge, the first short blade 6 protruding from the distal end surface 21a of the tool body 21 to the distal end side gradually approaches the base end side from the outer peripheral side toward the rotation axis O in the angle β (for example, β = 7-10 °, β
= Α is also possible), and the third corner blade 12 at the other end is inclined.
Are spaced outward from the rotation axis O. Therefore, the second short blades 7 and the second long blades 9 located inside the two chips 1A and 1B and the side surfaces 4 and 4 thereof are inclined outwardly in the direction gradually moving away from the rotation axis O from the distal end toward the proximal end. are doing.

The main chip 1A and the sub chip 1B are mounted so that the axial rake angle becomes positive as shown in FIG. 4 for the first short blade 6 and the first long blade 8 forming the outer peripheral blades. (Only the first long blade 8 is shown in FIG. 4). FIG. 2
As shown in the figure, the main tip 1A has a second long blade 9 serving as a front blade.
Is located on a radial line centered on the rotation axis O, the radial rake angle is 0 °, and the sub-tip 1B is located at a position where the first short blade 6 forming the front blade rises in center, and the radial rake angle is set. Is a negative angle.

Since the indexable insert 1 and the end mill 20 according to the present embodiment are configured as described above, if the tool body 21 is rotated around the rotation axis O to cut the workpiece, the tool body 21 The second long blade 9 and the first short blade 6 protrude toward the distal end of the workpiece, and the outer peripheral corner blades 12 and 10 bite into the work material, and this region rotates at a higher speed as compared with the vicinity of the rotation axis O. The cutting resistance is small when biting from the surface, and cutting can be performed without causing breakage. Further, by sending the tool body 21 to the front end side in the direction of the rotation axis O, the second long blade 9 and the first short blade 6 whose rotation trajectories overlap can perform rotary cutting like a drill. Further, by sending the tool body 21 in the lateral direction, the outer peripheral cutting is performed by two blades of the first short blade 6 and the first long blade 8 forming the outer peripheral blade, and the second long blade 9 and the first short blade 6 are formed.
Finish cutting can be performed by the corner blades 12 and 10. Alternatively, the first short blade 6 and the first long blade 8 serving as the outer peripheral blades can perform shoulder cutting, groove processing, and the like. Then, one of the chips 1A,
Even if the cutting edge of 1B is broken or worn, the same indexable insert 1 may be replaced and mounted.

As described above, according to the present embodiment, a plurality of identical chips 1 are mounted on the tool body 21 at different mounting angles and postures, and the second long blade 9 and the first short blade 6 are each used as a front blade. In addition, the first short blade 6 and the first long blade 8 can be arranged and configured as outer peripheral blades, and only one kind of replacement chip needs to be stored, so that the manufacturing cost of the chip and the running cost of the cutting tool are reduced. In addition, at least the corner angles of the first and third corner blades 10 and 12 on both sides of the first short blade 6 are 90.
° or less, for example, an acute angle, so that the corner blades 10, 12 on the outer peripheral end of the main chip 1A and the sub chip 1B can be disposed in the state of being most protruded toward the front end.
Since cutting defects at 0 and 12 can be suppressed and the blades can be arranged as two blades having overlapping rotation trajectories, cutting efficiency is good. In the mounted state, the inner side surface 4 of the main and sub chips 1A, 1B is gradually inclined away from the rotation axis O from the distal end of the tool main body 21 toward the base end side. The thickness of the center portion 26 of the tip end of the tool body 21 sandwiched is determined by the rotation axis O.
And the rigidity of the tool body 21 can be secured.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 7. The same reference numerals are used for the same or similar parts as in the first embodiment, and the description is given. Omitted. FIG. 5 is a side view of a throw-away type end mill according to the second embodiment, FIG. 6 is a side view in the direction C of the end mill shown in FIG. 5, and FIG. FIG.
7 has the same configuration as the throw-away type end mill 20 according to the first embodiment described above, and is provided at the distal end of the tool body 21. Two concave grooves 31 and 32 are provided which are substantially opposed to a rotation axis O which forms a rotation center and are cut out in a substantially fan-shaped cross section. Each groove 3
The tip mounting seats 24a and 24b are formed on the front faces of the grooves 31 and 32 in the rotation direction, and the main chips 1A and 1B are respectively mounted on the first and second grooves 31 and 32. The arrangement of these chips 1A and 1B is the same as that of the first embodiment.

The main chip 1 is inserted into one of the grooves 31.
A tip mounting seat 31a is further formed on the base end side of A, and the above-mentioned indexable tip 1 is mounted as a third tip 1C. The third tip 1C is made to protrude radially outward from the outer peripheral surface of the tool body 21 using the second long blade 9 as an outer peripheral blade, is positioned substantially parallel to the rotation axis O, and directs the second short blade 7 to the tip end side. It is arranged. The second long blade 9 has a positive axial rake angle as shown in FIG.
Sub chip 1B at a position opposed to the axis of rotation O
Are arranged so as to be shifted from the first long blade 8 to the base end side so as to overlap the rotation locus of the first long blade 8 forming the outer peripheral blade. Moreover, the first short blade 6 of the main chip 1A and the second long blade 9 of the third chip 1C, which form the outer peripheral blades, respectively, are twisted rearward in the rotational direction of the tool body 21 from the distal end toward the proximal end. Have been.

Next, the sub-tip 1B is
Further, a tip mounting seat 31b is formed on the base end side, and the above-mentioned indexable tip 1 is mounted as a fourth tip 1D. The fourth tip 1D projects radially outward from the outer peripheral surface of the tool body 21 using the first long blade 8 as an outer peripheral blade, and is positioned substantially parallel to the rotation axis O.
It is arranged facing. The first long blade 8 has a positive axial rake angle as shown in FIG. 7, and the third tip 1 </ b> C located at a position facing the rotation axis O of the tool body 21.
The second long blade 9 is disposed so as to be shifted from the second long blade 9 to the base end side so as to overlap with the rotation locus of the second long blade 9 constituting the outer peripheral blade. In addition, the first long blade 8 of the sub-tip 1B and the first long blade 8 of the fourth chip 1D, each forming an outer peripheral blade, are arranged to be twisted rearward in the rotational direction of the tool body 21 from the distal end toward the proximal end. Have been.

An end mill 30 according to the second embodiment.
According to the main chip 1A located at the tip of the tool body 21,
Are arranged laterally so that the first short blade 6 forms an outer peripheral blade, and the sub chips 1B are arranged longitudinally so that the first long blade 8 forms an outer peripheral blade. Therefore, the third chip 1C and the fourth chip 1D Can be arranged on the base end sides of the main chip 1A and the sub chip 1B so that the rotation trajectories of the respective outer peripheral blades are continuous, and deep hole drilling can be performed. In addition, each chip 1A, 1B, 1C, 1D can be achieved by the same chip. Note that the number of chips 1 to be arranged is not necessarily four, and three or five or more chips may be arranged. Moreover, the first long blade 8 located on the base end side of the main tip 1A is gradually inclined from the outer peripheral side of the tool body 21 toward the rotation axis O side due to the arrangement relationship between the main tip 1A and the third tip 1C. The outer peripheral portion 27 between the two chips 1A and 1C is arranged because the second short blade 7 is inclined from the outer peripheral side toward the rotation axis O toward the base end side.
The thickness of the tool body 21 can be increased from the outer peripheral side toward the inner side.
In FIGS. 5 to 7, one or both of the third chip 1C and the fourth chip 1D may be arranged in the horizontal direction, and the first and / or second short blades 6 and 7 may be used as outer peripheral blades. The first long blade 8 and the second long blade 9 may be respectively arranged as the outer peripheral blades by vertically inverting the first and fourth chips 1D and 1D, and if the rotational trajectories of the outer peripheral blades can be continuously arranged, the chips may be used. May be arranged in any direction.

Next, another example of the throw-away tip of the present invention will be described as a third embodiment with reference to FIG. 8, but the same or similar parts as the throw-away tip 1 according to the first embodiment are the same. The description will be made using the reference numerals. FIG.
(A) is a plan view of the throw-away tip according to the present embodiment, and (b) is an E of the throw-away tip shown in (a).
FIG. 3C is a side view in the F direction, and FIG. 3D is a side view in the G direction. A throw-away tip (hereinafter sometimes referred to as a tip) 40 according to the third embodiment shown in FIG. 8 has a substantially rectangular plate shape, and an upper surface 41 facing the lower surface 2 forming a seating surface has a first short blade. 6 is formed so as to be inclined so as to gradually reduce the distance from the lower surface 2 toward the opposing second short blade 7, so that the first long blade 8 and the second long blade 9 are also the first short blade. It is a straight cutting edge that is inclined from the 6 side toward the second short blade 7 side. Therefore, the second short blade 7
Are formed with the smallest distance from the lower surface 2. An insertion hole 5 penetrating the upper and lower surfaces 2 and 41 is formed in a direction substantially orthogonal to the lower surface 2. Or you may make it orthogonal to the upper surface 41.

When such a chip 40 is mounted on the end mill 30 (20) instead of the chip 1, if the radial rake angle or the axial rake angle of each cutting edge of each chip 40 is not changed, The thickness of the chip mounting seats 24a, 24b, 31a, 32a on the back surface of the chip can be increased, and the strength of the tool body 21 can be improved. In the main chip 40A shown in FIG. 9 and the third chip 40C shown in FIG. 10, the thickness of the chip mounting seats 24a and 31a on the second short blade 7 side can be increased. When the chip 40 or 1 is mounted on the chip mounting seat without changing the posture of the seating surface (lower surface 2) of the chip 40 or 1, as shown in FIG. In the fourth chip 40D, the axial rake angle of the first long blade 8 as each outer peripheral blade can be increased, and the sharpness of the outer peripheral cutting can be improved.

When the chip 1 according to the first embodiment and the chip 40 according to the third embodiment are mounted on an end mill, they are indicated by end mills 20 and 30 as shown in the first and second embodiments. The main chips 1A and 40A are arranged laterally at the tip of the tool body 21 as
The configuration is not limited to the configuration in which 0B is arranged in the vertical direction, and other appropriate arrangement forms can be adopted. For example, in FIG. 12A, two chips 1, 1 (40, 4
0) are arranged in the horizontal direction, and the first short blades 6, 6 are respectively arranged.
Is used as the outer peripheral blade and the second long blades 9 and 9 are used as the front blades. This end mill 50 can be applied to large-diameter hole machining. In the end mill 60 shown in FIG. 12B, one tip 1 (40) is arranged in the lateral direction, the first short blade 6 is used as the outer peripheral blade, and the second long blade 9 is used as the rotation axis O.
The other tip 1 (40) is arranged in the longitudinal direction, the second short blade 7 is a front blade, and the second long blade 9 is an outer peripheral blade. In the end mill 70 of FIG. 12C, two chips 1, 1 (40, 40) are vertically arranged, the first short blade 6 is a front blade, and the first long blade 8 is an outer peripheral blade. In the end mill 80 shown in FIG. 12D, two chips 1, 1 (40, 40) are arranged in the longitudinal direction, the second short blade 7 is a front blade, and the second long blade 9 is an outer peripheral blade. In the end mill 90 shown in FIG. 12E, the two chips 1, 1 (40, 40) are both arranged in the vertical direction, the first short blade 6 of one of the chips 1 is used as the front blade, and the first long blade 8 is used as the first blade. The second short blade 7 of the other chip 1 is a front blade, and the second long blade 9 is a peripheral blade.

In this case, the end mills 50, 70, 80,
In the case of 90, an uncut portion (core residue) occurs at a portion sandwiched between the two chips 1 and 1 at the time of cutting, but if the work material of the core residue is small, it can be peeled off with an end mill. If it is fed sideways, it is also possible to scrape off the remaining part. Also, in the end mill 60, the second long blade 9 of one tip 40 overlaps with the rotation axis O, so that no core residue occurs.

As a modified example of the chip 40 according to the third embodiment, a structure shown in FIG. 13 may be provided. FIG.
(A) is a plan view of the throw away tip according to the present embodiment, and (b) is an H of the throw away tip shown in (a).
(C) is a side view in the I direction, (d) is a side view in the J direction, and (e) is a side view in the K direction. The throw away tip 4 according to the modification shown in FIG.
Reference numeral 3 denotes a substantially rectangular plate, and an upper surface 44 facing the lower surface 2 forming a seating surface is formed in a twisted surface. For this reason, the first short blade 6, the second short blade 7, the first long blade 8, Each of the second long blades 9 is a straight cutting blade that is inclined at an arbitrary angle so that the distance from the one end of the corner blade to the lower end 2 gradually changes from one end of the corner blade to the other end. An insertion hole 5 penetrating the upper and lower surfaces 2 and 44 is formed in a direction substantially perpendicular to the lower surface 2. Or you may make it orthogonal to the upper surface 44. By adopting such a configuration, a suitable radial rake angle and axial rake angle can be set according to the mounting position and posture of each cutting blade.

The upper surfaces 3, 41 and 44 may be provided with breaker grooves. Also, two chips 1, 1 (40, 40;
Each of the front blades 43, 43) may be disposed at a position where the center is raised or lowered.

In the chips 1, 40, 44 of the first and third embodiments, the corner angles of the acute first and third corner blades 10, 11, 12 may or may not be the same. Note that each of the throw-away chips 1, 40, and 40 in the first and third embodiments and the modified examples described above.
In FIG. 43, the long blades 8, 9 and the short blades 6, 7 are linear, but may be convex or concave instead. In this case, the upper surfaces 41, 44 are convex or concave. But it is good. The indexable insert according to the present invention is not limited to the end mills 30, 50, 60, 70, 80, 90, and can be mounted on various cutting tools such as other types of rolling tools and turning tools.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 14 and 15. The same reference numerals are used for the same or similar parts as in the above-described second embodiment, and the description is given. Omitted. FIG. 14 is a plan view of the indexable insert according to the fourth embodiment, and FIG. 15 is a side view of the indexable end mill according to the fourth embodiment. FIG.
The indexable insert 96 shown in FIG. 1 is the same as the indexable insert 1 according to the first embodiment shown in FIG. A sub-cutting edge 97 that is inclined with respect to the other portion so as to retreat inside one surface 3 is formed. The other part of the second long blade 9 is
7 is inclined at an angle θ (eg, θ = 5 °).

The indexable end mill 98 according to the fourth embodiment has the same configuration as the indexable end mill 30 according to the above-described second embodiment.
A chip 96 is provided instead of the chip 1. At the tip of the tool body 21, two concave grooves 31 and 32 are provided which are substantially opposed to a rotation axis O which forms a center of rotation and are cut out in a substantially fan-shaped cross section. Each groove 31, 3
2 has chip mounting seats 24a and 24b formed on the surfaces facing the rotation direction on the tip side of each of the grooves 31 and 32, and the main chip 96A and the sub chip 96B are mounted respectively. The arrangement of these chips 96A and 96B is the same as the arrangement of chips 1A and 1B in the above-described second embodiment. In the above arrangement, the sub-cutting edge 97 formed on the second long blade 9 of the tip 96 </ b> A protrudes more toward the distal end of the tool body 21 than the other portion of the second long blade 9. Further, the second long blade 9 of the tip 96B is located on the inner peripheral side of the tool body 21, and does not act on cutting.

The main chip 9 is inserted into one of the grooves 31.
A tip mounting seat 31a is further formed on the base end side of 6A, and the above-mentioned indexable tip 96 is mounted as a third tip 96C. The third tip 96C has a second long blade 9
Is disposed radially outwardly from the outer peripheral surface of the tool body 21 as an outer peripheral edge, is positioned substantially parallel to the rotation axis O, and is disposed with the second short blade 7 facing the distal end side. In this arrangement, the sub-cutting edge 97 formed on the third tip 96 </ b> C escapes to the inner peripheral side of the tool main body 21 with respect to the other portion of the second long blade 9.

Next, in the other concave groove 32, the sub chip 96
A tip mounting seat 31b is further formed on the base end side of B, and the above-mentioned indexable tip 96 is mounted as a fourth tip 96D. The fourth tip 96D is made to protrude radially outward from the outer peripheral surface of the tool body 21 using the first long blade 8 as an outer peripheral blade, is positioned almost parallel to the rotation axis O, and directs the first short blade 6 toward the distal end. It is arranged. In this arrangement,
The second long blade 9 of the tip 96D is located on the inner peripheral side of the tool body 21, and does not act on cutting.

End mill 98 according to the fourth embodiment
According to the throw away tip 96, the tip 9
6A secondary cutting edge 97 can be used for finish cutting,
In the other inserts 96B, 96C and 96D, the sub cutting edge 97 does not act on the cutting of the work material. Thus, the end mill 98
In the indexable insert 96, the second long blade 9
Since the wear of the sub cutting edge 97 is prevented from progressing except when the front cutting edge is used, the sharpness of the sub cutting edge 97 can be ensured. , A good finished surface can be obtained. In addition, since the first long blade 8 on which the sub cutting edge 97 is not formed is used as the outer peripheral edge in the tip 96D located at the base end side of the tool main body 21, the sub cutting edge 97 is used as the second long blade 9. While forming, the maximum cutting depth S of the indexable cutting tool can be ensured. Note that the chip 96
Is not necessarily four, and three or five or more may be arranged. In the fourth embodiment, the indexable insert 96 is formed by forming the secondary cutting edge 97 on the second long blade 9 in the indexable insert 1 according to the first embodiment shown in FIG. However, the present invention is not limited to this.
At 0 or 43, the second long blade 9 may be formed with a sub cutting edge 97. Further, the indexable insert 96 is not limited to the end mill 98, and may be mounted on another end mill.

[0032]

As described above, in the indexable insert according to the present invention, the corner angle of one of the two adjacent corner blades on one surface is set to 90 ° or less, and the other one of the opposing ones including these corner blades is provided. Since the two ridges are non-parallel cutting blades, a plurality of such the same throw-away inserts are used, and one of the two corner blades is placed on the tip of the tool body so as to be located on the tip outer peripheral side. When it is arranged, the front blade, the outer peripheral blade, and the outer peripheral corner blade can be arranged as two blades, hardly breakage, high cutting efficiency, easy storage of chips, low running cost and the like.

Further, since one of the two other corner blades on one surface has a corner angle of 90 ° or less, when the chip is mounted on the tool body, the thickness of the peripheral portion of the chip on the tool body can be secured and the strength can be secured. Is high. Further, the other two edges of one surface may be non-parallel cutting blades (6, 7). In this case as well, the thickness of the tool main body at the peripheral portion of the chip can be secured, and the strength is increased. Further, two pairs of non-parallel cutting blades (6, 7, 8, 9) facing each other form a seating surface (2) facing one surface.
From the one end to the other end, so that the thickness of the back surface of the chip mounting seat of the tool body can be increased by the mounting posture of the chip with respect to the tool body, and the strength can be improved, or The radial rake angle and axial rake angle of the cutting blade can be set large, and the sharpness can be improved. Further, a suitable radial rake angle and axial rake angle can be set according to the mounting position and posture of each cutting blade. In addition, the cutting edge (9) is formed with an auxiliary cutting edge (97) that is inclined with respect to other portions so as to retreat as it approaches the corner blade (12), so that the cutting edge (9) is used as an outer peripheral edge. The wear of the sub-cutting edge (97) during use can be prevented from progressing, and the sharpness of the sub-cutting edge when used as a front blade can be ensured. Thereby, when the work material is finished by the front blade, a good finished surface can be obtained.

In the indexable cutting tool according to the present invention, the indexable inserts are the same indexable inserts according to any one of claims 1 to 4, and the indexable inserts are two adjacent ones. Since the corner blades are protrudingly arranged on the outer periphery of the tip of the tool body, cutting can be started from the corner blade on the outer periphery when drilling, etc., and chipping can be suppressed. Finishing can be performed with the corner blade on the outer peripheral side of the tip while shaving the shoulder with the blade.

A throw-away tip in which one corner blade protrudes toward the outer periphery of the tip end of the tool body is drilled because the cutting blade extending radially inward of the tool body from the corner blade extends to the rotation axis of the tool body. Cutting can be performed reliably without leaving a core when processing. Also, one of the two non-parallel cutting blades of the throw-away insert is a long blade, and the other two non-parallel cutting blades are short blades. One is a long blade as a front blade and a short blade is a peripheral blade, and the other is a short blade as a front blade and a long blade as a peripheral blade. Using the tips, the corner blades on the tip outer peripheral side of each tip protrude toward the tip side and can be arranged as two blades, so that it is hard to break and the cutting efficiency is good, and the same tip is further attached to the base end side of the tool body. By arranging, the rotation trajectories of the outer peripheral blades can be overlapped, and the storage of the chips and the like are easy. In addition, the same throw-away insert with the long blade as the outer peripheral edge is arranged on the base end side of one throw-away insert on the tool body, and when the tool main body is rotated around the rotation axis, the rotation of each outer peripheral blade is Since the trajectories are made to overlap, the same insert is sequentially superimposed from the distal end side to the proximal end side of the tool main body, so that the rotational trajectories of the respective outer peripheral blades can be overlapped, which can be employed for deep hole machining. In the indexable cutting tool according to the present invention, a plurality of the same indexable inserts in which the sub-cutting edge (97) is formed are used as the long cutting edge (9), and the cutting edge protrudes toward the tip end of the tool body. One of the plurality of indexable inserts has a long blade (9) as a front blade and a short blade (6) as an outer blade, and the long blade (9) has a sub-cutting edge (97) as a long blade (9). ) Is arranged so as to protrude more toward the tool tip side than the other part to affect the cutting of the work material, and in the other case, the long blade (9) is located on the tool inner peripheral side or the long blade (9 ) Is the outer peripheral edge, and the long blade (9) is the secondary cutting edge (9).
Since the sub cutting edge (97) is arranged so that the sub cutting edge (97) does not affect the cutting of the work material by positioning the sub cutting edge (9) at the inner peripheral side of the tool with respect to the other portion of the long cutting edge (9). When the cutting edge (9) is used as a front edge, the cutting edge (9) does not act on the cutting of the work material when the cutting edge (9) is used as a front edge. Only the cutting edge (9) acts on the outer cutting edge (9) as the outer cutting edge.
7) The progress of wear can be prevented, the sharpness of the sub-cutting blade when used as a front blade can be ensured, and a good finished surface can be obtained when finishing the work material. . In addition, in this indexable cutting tool, a secondary cutting edge (9) is used as an outer peripheral edge located closest to the base end side of the tool body.
By using the cutting blade (8) in which 7) is not formed,
The maximum cutting depth of the indexable cutting tool can be ensured while forming the sub cutting edge (97) on the cutting edge (9).

[Brief description of the drawings]

FIG. 1 shows a throw-away tip according to a first embodiment of the present invention, wherein (a) is a plan view and (b) is A
(C) is a side view in the B direction.

FIG. 2 is a side view of a main part of an end mill on which two indexable tips shown in FIG. 1 are mounted.

FIG. 3 is a front view of the end mill shown in FIG. 2;

FIG. 4 is a side view of the end mill shown in FIG. 2 as viewed from a direction of an outer peripheral blade.

FIG. 5 is a side view of an end mill according to a second embodiment of the present invention.

FIG. 6 is a side view of the end mill shown in FIG. 5 as viewed from a direction C.

FIG. 7 is a side view of the end mill shown in FIG. 5 when viewed from a direction D.

FIGS. 8A and 8B show a throw-away chip according to a third embodiment of the present invention, wherein FIG. 8A is a plan view, FIG. 8B is a side view of the chip of FIG. Is a side view similarly seen from the F direction, and (d) is a side view similarly seen from the G direction.

FIG. 9 is a front view of an end mill to which the throw-away tip shown in FIG. 8 is attached.

FIG. 10 is a side view of the end mill shown in FIG. 8 as viewed from a direction of one outer peripheral blade.

11 is a side view of the end mill shown in FIG. 8 as viewed from the direction of the other outer peripheral blade.

FIG. 12 (a), (b), (c), (d), (e)
FIG. 6 is a front view showing another example of the end mill to which the throw away tip is attached.

13A and 13B show a throw-away tip according to a modification of the third embodiment, wherein FIG. 13A is a plan view, FIG. 13B is a side view of the tip of FIG. Is a side view similarly viewed from the I direction, (d) is a side view similarly viewed from the J direction, and (e) is a side view similarly viewed from the K direction.

FIG. 14 is a plan view showing a throw-away tip according to a fourth embodiment of the present invention.

FIG. 15 is a side view of an end mill according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1, 40, 43, 96 indexable inserts 1A, 40A, 96A main insert 1B, 40B, 96B auxiliary insert 1C, 40C, 96C third insert 1D, 40D, 96D fourth insert 6 first short blade 7 second short blade 8 First Long Blade 9 Second Long Blade 10 First Corner Blade 11 Second Corner Blade 12 Third Corner Blade 13 Fourth Corner Blade 20, 30, 98 End Mill 21 Tool Body 97 Secondary Cutting Blade

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Shimomura 1511 Furamagi, Ishishita-cho, Yuki-gun, Ibaraki Pref.

Claims (10)

[Claims] 1. A corner plate having a substantially square plate shape, wherein two corner blades adjacent to each other on one surface have a corner angle of 90 ° or less, and two opposing ridges including these corner blades, respectively. Is a non-parallel cutting blade. 2. The indexable insert according to claim 1, wherein one of the other two corner blades of the one surface has a corner angle of 90 ° or less. 3. The cutting edge according to claim 1, wherein the other two ridges of the one surface are non-parallel cutting edges.
The described throwaway tip. 4. The two pairs of non-parallel cutting blades facing each other are inclined so that a distance from a seating surface facing the one surface gradually changes from one end to the other end. The throw-away tip according to claim 3, wherein 5. One of the other two corner blades of the one surface has a corner angle of 90 ° or less, and a cutting blade including the corner blade and one of the one corner blades is a long blade, At the end of the long blade including one of the one corner blades, a sub-cutting blade which is inclined with respect to another portion so as to recede inside the one surface as approaching the corner blade is formed. The throw-away tip according to any one of claims 1 to 4, wherein 6. A throw-away type cutting tool comprising a plurality of throw-away tips, each of which has a cutting edge protruding from the distal end side of the tool body, and wherein the plurality of throw-away tips are provided. 6. The same throw-away insert according to any one of claims 5 to 5, wherein the plurality of throw-away inserts are arranged such that the two adjacent corner blades protrude toward the outer periphery of the tip end of the tool body. Indexable cutting tools. 7. A throw-away tip in which one of the corner blades protrudes toward the outer periphery of the distal end of the tool main body has a cutting blade extending radially inward of the tool main body from the corner blade as a front blade extending to the rotation axis of the tool main body. 7. The indexable cutting tool according to claim 6, wherein 8. One of the two non-parallel cutting blades of the indexable insert is a long blade, and the other two non-parallel cutting blades are short blades, and protrudes toward the tip end of the tool body. One of the plurality of indexable inserts is disposed at the tip of the tool body with the long blade as the front blade and the short blade as the outer blade, and the other as the short blade as the front blade and the long blade as the outer blade. The indexable cutting tool according to claim 6, characterized in that: 9. The tool body is provided with the same throw-away tip having a long blade as an outer peripheral edge at a base end side of the one throw-away tip, and when the tool body is rotated around a rotation axis. 9. The indexable cutting tool according to claim 8, wherein the rotation trajectories of the respective outer peripheral blades overlap each other. 10. A throw-away type cutting tool comprising a plurality of throw-away tips, each of which has a cutting edge protruding from the tip of the tool main body and disposed on the tip side thereof, wherein the plurality of throw-away tips are attached. The same indexable insert described, one of the plurality of indexable inserts is a long blade having the sub-cutting edge as a front edge, a short edge as an outer peripheral edge, and a long edge having the sub-cutting edge, The sub cutting edge is disposed so as to protrude more toward the tool tip than the other portion of the long blade, and the other is disposed such that the short blade is a front blade and the long blade is an outer peripheral blade. The same throwaway tip having the long blade as the outer peripheral blade is disposed on the base end side thereof, and is arranged so that the rotation trajectories of the respective outer peripheral blades overlap when the tool body is rotated around the rotation axis. You In the case where a long blade having the sub cutting edge is used as an outer peripheral edge of the other indexable insert, the sub cutting edge is positioned closer to the inner peripheral side of the tool than the other portion of the long cutting edge to cut the work material. A throw-away type cutting tool which is arranged so as not to affect cutting.