JPH067845Y2 - Throw-away tip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a throw-away tip, and more particularly, to an improved tip breaker groove and cutting edge configuration suitable for light to medium cutting. .

(Prior Art) Conventionally, as throw-away chips of this type, those found in, for example, Japanese Utility Model Publication No. 51-19271, Japanese Patent Publication No. 52-33838, Japanese Utility Model Publication No. 55-129707, etc. are disclosed. Has been done.

Then, in the first publication, a descending inclined surface is provided in the transverse direction from the cutting edge to the center, and a plurality of protrusions are provided in the direction along the cutting edge to form an uneven shape. is there. Further, in the second publication, the cutting edge has an uneven corrugated shape, and the central boss surface is curved or inclined. Further, in the third publication, a breaker groove is provided all around, and a land portion whose height changes along the periphery of the central boss surface is formed.

(Problems to be solved by the device) However, in the first publication, the presence of a plurality of protrusions provides a compulsory curling effect, but on the other hand, there is a problem that the cutting resistance becomes high. was there. Also,
In the second publication, the chip treatment is effective in the range of large cutting and feeding due to the presence of the corrugated cutting edge and the curved or inclined central boss surface, but the chip disposability in light cutting is not always good. There was a problem that it was not. Furthermore, what is seen in the third publication deals with variations in cutting and feeding by changing the height of the land portion. However, since the outer peripheral cutting edge ridge itself is a straight ridge, the chip treatment is not better than that found in the second publication.

Therefore, in the present invention, light to medium cutting, for example, the cut d
= 1 to 5 mm and feed f = 0.15 to 0.4 mm / rev, the cutting process can be smoothly performed including the cut cutting and the profiling cutting in which the feed is changed. It is intended to provide a throw-away tip that can be reduced.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned points, and has a polygonal plate shape, a cutting edge is formed on the outer peripheral edge thereof, and the polygonal surface is formed on the polygonal surface. , A chip breaker groove with a narrow land is formed so that the central boss surface remains, and a strip-shaped portion extending from the central boss surface into the chip breaker groove is formed in the nose bisector direction. This is an improvement on the premise of a throw-away chip that is formed. That is, when the cutting edge is viewed from the circumferential side surface direction, a straight cutting edge starts near the nose, and subsequently a concave cutting edge and a convex cutting edge are formed, and moreover, it is convex near the center of the side. It is where the cutting edge is located.

Further, in the chip breaker groove, in the transverse direction from the cutting edge to the central boss surface, a downwardly inclined surface having an inclination angle θ is formed, followed by a full-circumferential projection and a rising surface to the central boss surface, and The inclination angle θ changes so as to be large in the vicinity of the nose and small in the vicinity of the deepest part of the concave cutting edge.

Further, the strip-shaped portion is configured such that the root portion with respect to the central boss surface is connected to the entire circumferential projection and the cut-up surface, and the nose projection is formed at the tip portion of the strip-shaped portion projecting to the nose side. Is.

(Operation) The throw-away tip of the present invention effectively forms a chip by forming a full-circumferential projection and a strip-shaped nose projection in the chip breaker groove.
This is what is called the curl effect.

Further, the fluidity of chips, chip resistance, etc. are improved in accordance with the unevenness of the cutting edge, and there is no chip jamming.

(Embodiment) An embodiment of the throw-away tip of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, (1) is a throw-away tip having a substantially triangular plate shape, and a central mounting hole (3) is bored in a middle boss surface (2) having a middle height. Further, a chip breaker groove (5) having a narrow land (4) is formed on the outer peripheral edge thereof. This chip breaker groove (5)
In the transverse direction toward the central boss surface (2), an inclined surface (6) having a downward inclination angle θ following the land (4), a full-circumferential projection
A cut-up surface (8) for the (7) and the central boss surface (2) is formed, respectively.

Furthermore, when the bisector direction of the nose (11) is used as a reference, the tip of the strip portion (9) extending from the central boss surface (2) is accompanied by a roundness that surrounds this tip portion. A nose protrusion (10) is formed. Therefore, chip breaker groove
(5) has a shape in which the circumferential projection (7) and the cut-up surface (8) are connected to the root of the strip-shaped portion (9) and the groove width is widened, and the strip-shaped portion (9) At the tip, the groove width becomes narrow due to the nose protrusion (10). In this case, the nose protrusion (10) functions to curl the chips generated during light cutting and performs chip processing.

Further, the land (4) has a nose (11) in a side view.
It is a horizontal plane in the vicinity, and a concave curved surface and a convex curved surface are continuously arranged so as to be convex at the center of the side. As a result, the cutting edge ridge (12) formed by the land (4) and the peripheral side surface has a nose (11).
A straight cutting edge (12a) is formed in the vicinity, and subsequently, a concave cutting edge (12b) and a convex cutting edge (12c) are connected. Then, a convex cutting edge (12c) is formed at the center of the side. FIG. 3 shows a modified example of the land (4), particularly the nose.
(11) The width of the vicinity is narrow, and gradually widens toward the center of the side. This is especially because the feed f is 0.4-
At 0.5 mm / rev, chipping resistance due to chips appears.

Further, as shown in FIG. 4 and FIG. 5, regarding the inclination angle θ of the inclined surface (6), θ ₅ of the nose (11) is the most and near the deepest of the concave cutting edge (12b). Θ ₄ changes so as to be the smallest. This is because during light cutting, the rake angle is large, so the sharpness is improved, and during medium cutting, chip clogging is prevented. Furthermore, on the surface of the throw-away tip (1) of the present invention, Tic, T
Providing a hard coating layer such as iN contributes to improved cutting performance.

FIG. 6 shows the chip processing range in the product A of the present invention and the conventional product B. In this case, the work material has a cutting speed V set to 150 m / min in S48C. In addition, the tool specifications are based on TNMG332 as the basic shape. For the conventional product B, the entire circumference protrusion (7), nose protrusion (10), concave cutting edge (12b) and apex angle portion (9) are used. It does not have each.

The shape effect of the product A of the present invention is as follows. In other words, the nose protrusion (10) expands the range of small cuts and low feed (lower left part of the figure), and the whole circumference protrusion (7)
Is for enlarging a relatively large depth of cut and low feed range (the lower right part of the figure). Also, the concave cutting edge (12b)
Is a large depth of cut, relatively low feed range (right side of the figure ~
The lower part) is enlarged, and the belt-like part (9) is enlarged by a large incision to enlarge a relatively large feed range (upper right part to lateral part in the figure).

FIG. 7 is a comparison of chip resistance (composite force) between the product A of the present invention and the comparative product B, and it can be seen that the cutting resistance of the product A of the present invention is low. In this case, the work material is SCM415.
And the cutting speed V is V = 160 m / min and the cutting depth d is d = 2 m.
The feed rate f was changed while keeping m constant. Further, the basic shape of the tool specification is that the conventional product B does not have the full-circumferential projection (7), the nose projection (10), the concave cutting edge (12b) and the apex angle portion (9).

(Effect of the Invention) The throw-away tip of the present invention configured as described above
(1) has the following effects.

First, good chip control. This is because, as shown in FIG. 6, in the region where the cut is small, for example, 1 to 2 mm or less, the chip is increased due to the presence of the nose protrusion (10) and the straight cutting edge (12a) formed in the strip portion (9). Because it curls. In addition, in the region where the cutting is large, for example, 3 to 4 mm or more, the formation of the concave cutting edge (12b) imparts the increment, and as a result, the chips are guided to the side opposite to the cutting direction, and the chips are gently cut. Curling of chips is forced by the circumferential projections (7) of the breaker groove (5), which prevents chip jamming.

Secondly, the cutting resistance is reduced. This is the 7th
This is clearly shown in the figure. Then, in the region where the cut is small, the cutting resistance is reduced due to the addition of the inclination angle θ and the formation of the nose protrusion (10). Also, the land (4)
The cutting resistance is further reduced by minimizing the width of the groove near the nose (11) or maximizing the inclination angle θ near the nose (11). On the other hand, in the area where the cut is large,
Due to the addition of incrementation by the concave cutting edge (12b), the widening of the chip breaker groove (5), and the unevenness of the projections (7) around the circumference, chip clogging is prevented and the cutting resistance is reduced as a result. is there.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a throw-away tip of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a partial front view showing an enlarged modification, and FIG. , IV- in Fig. 1
FIG. 5 is a partially enlarged sectional view taken along line IV, FIG. 5 is a partially enlarged sectional view taken along line VV in FIG. 1, and FIG. FIG. 7 is an explanatory diagram showing the effective range of the chip treatment in the product B, and FIG. 7 is an explanatory diagram showing a comparison of cutting resistance. (1)… Throw-away tip (2)… Center boss surface, (4)… Land (5)… Chip breaker groove, (6)… Inclined surface (7)… Full circumference projection, (9)… Strip-shaped part (10) )… Nose protrusion, (11)… Nose (12)… Cutting edge, (12a)… Straight edge (12b)… Incision edge, (12c)… Convex edge

Claims (1)

[Scope of utility model registration request] 1. A polygonal plate shape, a cutting edge (12) is formed on an outer peripheral edge of the polygonal plate, and a central boss surface (2) having a middle height is left on the polygonal surface. And a chip breaker groove (5) with a narrow land (4) is formed, and in the direction of the bisector of the nose (11) from the central boss surface (2) to the chip breaker groove (5). ) In the throw-away tip so that the strip-shaped portion (9) extending inside is formed, the cutting edge ridge (12) has a straight cutting edge ridge (near the nose (11) when viewed from the circumferential side surface direction thereof. 12a) starts, followed by a concave cutting edge (12b) and a convex cutting edge (12c) are formed, and the convex cutting edge (12c) is located near the center of the side, and the chip breaker The groove (5), in the transverse direction from the cutting edge (12) toward the central boss surface (2), is followed by a downwardly inclined surface (6) having an inclination angle θ, and then a full-circumferential projection (7) and a center. Boss face
A rising surface (8) to (2) is formed, and the inclined surface (6)
The inclination angle θ of the is changed so that it is large near the nose (11) and small near the deepest of the concave cutting edge (12b), and the strip portion (9) is relative to the central boss surface (2). At the root portion, the nose protrusion (10) is provided so as to surround the tip portion, which is connected to the full-circumference protrusion (7) and the cut-up surface (8), and the tip portion protruding toward the nose (11) side. Throw-away tip that is characterized by.