JP2600809B2 - Indexable cutters and indexable tips - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a throw-away type cutter such as a shoulder cutting cutter having a substantially triangular tip on a cutter body and having a high cutting edge strength, and to a throw-away type cutter. It relates to the indexable tip to be used.

[Conventional technology]

Conventionally, as this type of shoulder milling cutter provided with a substantially triangular tip on the cutter body, as shown in FIGS. 11 to 14, a plurality of triangular tips are provided on the outer periphery of the distal end of the substantially cylindrical cutter body 1. Each of the shaped throw-away tips 2 is detachably mounted by a wedge member 4 and a clamp screw 5 via a supporter 3.

[Problems to be solved by the invention]

As shown in FIG. 12, a triangular indexable insert 2 used in the conventional shoulder milling cutter has an outer peripheral main cutting edge 6, a corner blade 7 connected to the outer peripheral main cutting edge 6, Three sets of sub-cutting edges 8 connected to the corner cutting edges 7 are provided, and since there are three usable cutting edge corners, it is more economical than a parallelogram-shaped or rhombus-shaped throw-away insert. There's a problem.

That is, since the tip apex angle is 60 ° as shown in FIG. 12, the strength in the vicinity of the sub-cutting edge 8 is insufficient, the chip is easily chipped largely, and the Sarai tip for improving the finished surface is formed by the above throwaway. Since the chip 2 has a shape different from that of the chip 2 (for example, a parallelogram), it cannot be attached to the same part, and must be replaced for each supporter. Therefore, there is no practical case.

The present invention has been made in view of the above circumstances, and its purpose is to increase the cutting edge strength, it is difficult for the chip to be damaged, and the Sarai chip is not distinguished from the general chip It is an object of the present invention to provide a throw-away type cutter and a throw-away tip which can be easily attached and can obtain a good finished surface (cut surface).

[Means for solving the problem]

In order to achieve the above object, a first indexable cutter according to the present invention is characterized in that a triangular-shaped tip provided on the outer periphery of the distal end of the cutter body and having a main cutting edge at each ridge forms an outer main cutting edge. A corner blade, a sub-cutting edge, and an inner flank are sequentially provided from the blade toward the inside of the cutter body, and the inner flank is inclined at a predetermined angle from the sub-cutting edge to the axis of the cutter body. Along the base end.

In the second throw-away type cutter according to the present invention, a second tip is provided on the cutter body in addition to the tip (first tip), and the second tip is moved from the outer peripheral main cutting edge to the cutter body. A corner blade and a Sarai blade are sequentially provided inward of the cutter body, and the Sarai blade is made to protrude more toward the tip end of the cutter body than the sub-cutting edge of the first tip, and is provided inside the cutter body. It is provided to extend long toward.

Further, the indexable insert of the present invention is a substantially triangular and plate-shaped insert body, and a main cutting edge forming each ridge,
A corner blade connected to the main cutting edge, a sub cutting edge connected to the corner blade, and an inner relief blade connected to the sub cutting edge are provided, and the inner relief blade is inclined at an obtuse angle from the sub cutting edge. It is provided.

(Operation)

In the throw-away type cutter and the throw-away insert of the present invention, the inner escape blade of the insert (first insert) is inclined at a predetermined angle from the sub-cutting edge, and is located at the base end side along the axis of the cutter body. By arranging, even if the minor cutting edge is worn, there is no variation in the width of the minor cutting edge that greatly affects the finished surface, a good finished surface is obtained, and by forming the leading edge of the cutting edge widely. And the cutting edge strength is increased.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

1 to 8 show an embodiment of the present invention. In the drawings, reference numeral 10 denotes a substantially cylindrical cutter body, and a plurality of throw-away tips ( A first chip 11 is mounted in a conventional manner.

As shown in FIGS. 2 to 5, the first chip 11 has a substantially triangular plate-shaped chip body 12 with a ridge on the upper surface serving as a cutting edge. The cutting edge includes a straight outer peripheral main cutting edge 13, an arc-shaped (for example, radius R = 1 mm) corner blade 14 connected to the outer peripheral main cutting edge 13, and a straight or large arc shaped continuous blade connected to the corner blade 14. (Eg 500m radius
m) and three sets of straight inner relief blades 16 connected to the sub cutting edge 15. The angle β between the inner escape blade 16 and the outer peripheral main cutting edge 13 is set to 89 ° to 65 °, preferably 87 ° to 80 °, and accordingly, the sub cutting edge is set.
The angle α composed of 15 and the inner escape blade 16 is 1 ° to 25 °,
Preferably, it is set to 3 ° to 10 °. Here, the reason why the angle α is set to 1 ° to 25 ° is that when the angle α is smaller than 1 °, the width y of the sub-cutting edge 15 is increased due to wear of the sub-cutting edge 15, and the finished surface is deteriorated. If the angle α is greater than 25 °, the tip of the cutting edge will have a sharpened shape, and the strength of the cutting edge will not be improved.

In the shoulder cutting cutter equipped with the first tip 11 configured as described above, the angle α formed by the sub cutting edge 15 and the inner escape blade 16 is 1 ° to 25 °. , Minor cutting edge 15
The width y (about 1 to 2.5 mm) can be restricted to a predetermined width, and the width y does not increase even if the sub-cutting edge 15 is worn, so that a good finished surface can be obtained, and By providing the cutting edge, the tip of the cutting edge can be widened, and thus the strength of the cutting edge during cutting can be improved. Note that by providing the inside flank edge 16, the maximum depth of cut T is, although less than the maximum depth of cut T ₁ of the conventional chip 2 shown in FIG. 11, a depth of cut that is actually used is sufficiently secured It does not hinder cutting.

In addition, at least one of the large number of first chips 11 attached to the cutter body 10 is a throw-away chip (second chip) shown in FIGS. 2 and 6 to 8.
You may replace it with 17. The second chip 17 has substantially the same shape as the first chip 11 and is slightly larger.
A straight outer peripheral main cutting edge 18, an arc-shaped (for example, a radius of 1 mm) corner blade 19 connected to the outer peripheral main cutting edge 18,
A straight line or a large arc (for example, radius 500
mm) and three sets of the same. Then, as shown in FIG.
A predetermined amount A (0.03 to
0.1)) It protrudes, and the Sarai blade 2
The width W of 0 is set to be longer (for example, 5 mm or more) than the width y (about 1 to 2.5 mm) of the sub cutting edge 15.

In the shoulder cutting cutter in which the second chip 17 configured as described above is mounted on the cutter body 10 together with the first chip 11, the first chip 11 and the second chip 17 are formed by the sarai blade 20. By cutting, the finished surface is formed more favorably, and the first chip 11 and the second chip 11 are formed.
Since the shape of 17 is almost the same, it can be easily replaced and can be flexibly adapted to the application.

In the above-described embodiment, the inner flank 16 of the first tip 11 has been described as a shape in which the inner flank 16 escapes linearly from the sub-cutting edge 15 to the base end side of the cutter body 10, but is not limited thereto. For example, as shown in FIG. 9 and FIG.
The inner escaping blade 21 may have a shape having a diameter of from 0.05 to 0.5 mm, preferably from 0.1 to 0.3 mm). That is, the inner escape blade 21 escapes inward from the auxiliary cutting edge 15 by an angle γ (10 ° to 45 °) and the amount of escape z (inclined portion 21a), and then the outer main edge is parallel to the auxiliary cutting edge 15. It extends to the cutting edge 13 (parallel portion 21b). In this case, as shown in FIG. 10, when the angle between the rake face and the flank in the parallel portion 21b of the inner flank 21 is a, and the angle between the rake face and the flank in the sub-cutting edge 15 is b. , A ≧
b.

〔The invention's effect〕

As described above, according to the present invention, the triangular chip in which each of the ridges provided on the outer peripheral portion of the distal end of the cutter body forms a main cutting edge moves inward of the cutter main body from the main cutting edge on the outer peripheral side. A corner blade, a sub-cutting edge, and an inner flank are sequentially provided, and the inner flank is arranged at a predetermined angle from the sub-cutting edge and disposed on a base end side along an axis of the cutter body. Therefore, by providing the inner escaping blade escaping inward at a predetermined angle following the sub-cutting edge, there is no variation in the width of the sub-cutting edge that greatly affects the finished surface even if the sub-cutting blade is worn, In addition to obtaining a good finished surface, the tip of the cutting blade can be formed widely, and therefore, the strength of the cutting blade can be increased.

Further, a second tip is provided on the cutter body in addition to the first tip, and the second tip is provided with a corner blade and a sali blade sequentially from the outer main cutting edge toward the inside of the cutter body. Since the Sarai blade is provided so as to protrude more toward the distal end of the cutter main body than the sub-cutting blade of the first tip and extend toward the inside of the cutter main body, By cutting the first tip together with the second tip by the sarai blade, a better finished surface can be obtained, and the shapes of the first and second tips can be made substantially the same. It can be easily replaced and can be flexibly handled.

Further, the indexable insert of the present invention is a substantially triangular and plate-shaped insert body, and a main cutting edge forming each ridge,
A corner blade connected to the main cutting edge, a sub cutting edge connected to the corner blade, and an inner relief blade connected to the sub cutting edge are provided, and the inner relief blade is inclined at an obtuse angle from the sub cutting edge. Since it is provided, the width of the sub-cutting edge does not fluctuate irrespective of the wear of the sub-cutting edge, so that a predetermined finished surface can be obtained, and the cutting edge is less likely to be damaged.

[Brief description of the drawings]

1 to 8 show one embodiment of the present invention.
1 is a sectional view, FIG. 2 is an explanatory view showing a first chip and a second chip, FIGS. 3 to 5 show examples of a first chip, and FIG. 3 is a plan view. FIG. 4 is a sectional view,
FIG. 5 is a plan view of the tip of the cutting blade, FIGS. 6 to 8 show examples of the second tip, FIG. 6 is a plan view, and FIG.
Fig. 8 is a cross-sectional view, Fig. 8 is a plan view of the tip of the cutting blade, Figs.
FIG. 10 shows another example of the first chip. FIG. 9 is an explanatory view, FIG. 10 is a view taken along the line XX of FIG. 9, and FIGS. Fig. 11 is a sectional view, Fig. 12 is an explanatory view of a chip, Fig. 13 is a front view, and Fig. 14 is a side view. 10 ... cutter body, 11 ... indexable insert (first insert), 13 ... outer main cutting edge, 14 ... corner blade, 15 ... sub cutting edge, 16 ... inner escape blade, 17 ... Indexable insert (second insert), 18… outer peripheral main cutting edge, 19… corner edge, 20… salai blade (secondary cutting edge), 21… inner escape blade, α, γ… angle.

Claims (3)

(57) [Claims] 1. A throw-away cutter in which a substantially triangular tip having each ridge as a main cutting edge is provided on the outer peripheral side of a tip end of a cutter body. A corner blade, a sub-cutting edge, and an inner flank are sequentially provided toward the inside of the cutter body, and the inner flank is inclined at a predetermined angle from the sub-cutting edge along the axis of the cutter body. A throw-away type cutter, which is arranged on the proximal side. 2. A throw-away type cutter in which a substantially triangular-shaped tip whose main edge is a main cutting edge is provided on an outer peripheral side of a tip end of a cutter body, wherein the first tip provided on the cutter body has an outer periphery. A corner blade, a sub-cutting edge and an inner flank are sequentially provided from the main cutting edge on the side toward the inside of the cutter body, and the inner flank is inclined at a predetermined angle from the sub-cutting edge. Along with the cutter body being disposed on the base end side along the axis of the cutter body, a second tip provided on the cutter body is configured to sequentially form a corner blade and a salary blade from the outer peripheral main cutting edge toward the inside of the cutter body. The salari blade is provided so as to protrude toward the distal end side of the cutter body more than the sub-cutting blade of the first tip and extend longer toward the inside of the cutter body. Slow-away cutter. 3. A throw-away insert having a substantially triangular and plate-shaped insert body, wherein the insert body has a main cutting edge forming each edge, a corner blade connected to the main cutting edge, and A throwaway tip, comprising: a continuous sub-cutting edge; and an inner flank connected to the sub-cutting edge, wherein the inner flank is provided at an obtuse angle with respect to the sub-cutting edge.