JPH07115251B2 - Cutting tip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cutting tip, and in particular, has an improved breaker shape suitable for grooving and parting.

(Prior Art) Conventionally, cutting tools such as grooving and parting often form a breaker on the rake face for chip disposal. Then, for example, a cutting tool found in Japanese Patent Application Laid-Open No. 57-156124 is disclosed.

In the cutting tool seen in this publication, a protrusion portion is formed on both sides of the main cutting edge, and a case where a groove portion is formed through a negative land in the center portion thereof, as well as a groove portion is formed on the center protrusion and both sides, A case in which a negative land is formed along the main cutting edge is disclosed. Then, these cutting tools give unevenness to the chips due to the presence of the above-mentioned projections and groove portions, and try to smooth the chip processing.

(Problems to be solved by the invention) However, in grooving, not only the main cutting edge is pushed into the work material to be fed, but also lateral feed may be given. Furthermore, in order to improve workability, copying There is a movement to apply to. And, for this type of cutting tip, for example, the one found in the above-mentioned publication, some of the cutting tips can be applied to simple lateral feed, but do not have a breaker shape that can be applied even to copying. Is the reality.

Further, when this type of cutting tip is used for grooving, the cutting may come into contact with the holder, and this countermeasure is also a problem.

Therefore, the present invention is intended to provide a cutting tip having a breaker shape that can be applied not only to grooving and parting, but also to copying.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned points, and on both sides of the main cutting edge having a linear shape, horizontal cutting edges are formed, and on the rake face side thereof. It is configured to improve the protruding breaker on the premise of a cutting tip provided with the protruding breaker.

That is, the projecting breaker is formed of the central projection and the arm projections extending from the central projection to both sides, and thus has a substantially Y shape in a top view with respect to the rake face. The central projection has a gradually increasing slope in the direction away from the main cutting edge. On the other hand, the arm protrusion is composed of an upper arm portion and a forearm portion, and when the center line of the central protrusion is used as a reference, the upper arm portion forms an inclination angle θ ₁ = 30 ° to 60 ° and the forearm portion is folded. The bending angle θ ₂ = 0 ° to 30 °, and the relationship of θ ₁ > θ ₂ extend in the direction of the main cutting edge. In this case, the upper arm part is located on the central protrusion side, and the forearm part is
Located on the main cutting edge side.

Further, a cutting tip is configured such that a raised protrusion is added to the connecting portion of the central protrusion and the arm protrusion.

(Operation) In the cutting tip of the present invention, in a normal grooving process, the chips extending from the main cutting edge hit the forearm portion of the arm protrusion and are curled and broken. The cutting at this time is also deformed in the width direction due to the presence of the arm protrusion. In addition,
The cutting that jumps over the arm projection hits the central projection, but the central projection is inclined so that it becomes higher as it moves away from the main cutting edge, so that the cutting has less contact with the boulder. When the raised protrusions are added, chips are hardly contacted with the holder.

Further, the cutting tip of the present invention is such that, when laterally fed, the cutting collides with the side forearm portion of the arm protrusion to curl and break. Therefore, it is possible to effectively perform a cutting process such as an oblique plunge, an oblique pull, and a back pulling process in accordance with the formation of the arm protrusion.

(Example) Hereinafter, about one example in the cutting tip of the present invention,
Description will be given with reference to the drawings.

In FIG. 1, (1) is a cutting tip in which a protruding breaker (2) is formed on a rake face (3), and the cutting tip (1) is placed in an appropriate holder (not shown). Mounted.

The projecting breaker (2) has a substantially Y shape in a top view of the rake face (3), and includes a central projection (4) and two arm projections (5). The central protrusion (4) has an inclination such that the height thereof gradually increases as the distance from the main cutting edge (6) increases.

The arm protrusions (5) (5) protrude from both sides of the central protrusion (4), but the upper arm portion (5a) and the forearm portion (5)
b) is connected so as to be bent. And this upper arm part (5a) is, as shown in FIG.
The angle of inclination θ ₁ is formed on the side of the central protrusion (4) with reference to the center line of the central protrusion (4). Also,
The forearm portion (5b) is on the side of the main cutting edge (6) and forms a bending angle θ ₂ with reference to the center line of the central protrusion (4).
In this case, the inclination angle θ ₁ of the upper arm portion (5a) is set within the range of 30 ° to 60 ° in consideration of the chip disposal, and
The bending angle θ _{2 in} b) is smaller than θ ₁ and is set within the range of 0 ° to 30 °. These allow the outer portion of the forearm portion (5b) to curl and break the chips when the cutting is performed by the horizontal cutting edge (7) with respect to the main cutting edge (6).

The rake face (3) described above may be flat,
It is preferable to have a hollow shape as shown in FIG. This is because a positive rake angle reduces cutting resistance.

FIG. 3 is a perspective view showing a modified example of the cutting tip (1), which is of a two-corner type. Further, the cutting tip (1) has a raised protrusion (8) formed at a connecting portion of the central protrusion (4) and the arm protrusions (5) and (5). When the chips extending beyond the arm protrusions (5) are generated, the rising protrusions (8) are curled and broken by being abutted against the rising protrusions (8). Therefore, in normal cutting, chips do not flow out toward the central protrusion (4), and the problem of contact with the holder is solved.

Furthermore, FIGS. 4 to 6 embody the embodiment of FIG. 3 described above. Then, with the cutting tip (1) having the two-corner type 5 mm wide main cutting edge (6) shown in FIGS. 4 to 6, the work material made of S45C was actually cut, but good chip disposal Was done.

The cutting conditions at this time were a cutting speed V of 80 to 100 m / min and a feed set to 0.3 mm / rev in the grooving cutting. As a result, due to the presence of the arm protrusions (5), the chips were cut with a deformed center, contacted the rising protrusions (8), and were curled and broken.

In addition, although it was laterally fed from the state of grooving, the arm protrusion (5)
Has provided effective chip control. The cutting conditions at this time were set with a depth of cut of 2 mm and a feed of 0.3 mm / rev. Further, cutting was performed by post-drawing and diagonal drawing, but all were good chip treatment. In this case, the cutting conditions are a depth of cut of 0.5 to 1.0 mm and a feed of 0.15 mm / rev.

(Effect of the invention) As described above, the present invention relates to the invention of the first claim, in which the central breaker (4) and the arm projection (5) are formed so that the projecting breaker (2) has a substantially Y shape. ), And the second aspect of the present invention is such that a raised protrusion (8) is added. Therefore, there is an advantage that the chip treatment is appropriately performed and can be applied not only to grooving and parting, but also to copying.

Further, along with this effect, if it is applied to copying of a complicated shaft such as a cam shaft, it is expected that the cutting work efficiency will be greatly improved and the holder body will be saved. This is because in the conventional work, holders having different cutting edge tips were used for cutting individually.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of a cutting tip of the present invention, FIG. 2 is a plan view of a conceptual main part, and FIG.
FIG. 4 is a perspective view showing a modified example, and FIGS. 4 to 5 are concrete views of FIG. 3. FIG. 4 is a plan view, FIG. 5 is a partial front view, and FIG. FIG. (1) …… Cutting tip, (2) …… Projective breaker (3) …… Rake face, (4) …… Central projection (5) …… Arm projection, (5a) …… Upper arm part (5b) …… Forearm, (6) …… Main cutting edge (7) …… Horizontal cutting edge, (8) …… Raised protrusion

Claims (2)

[Claims] 1. A horizontal cutting edge (7) is formed on both sides of a linear main cutting edge (6), and a protruding breaker (2) is provided on the rake face (3) side. In the cutting tip thus configured, the protruding breaker (2) includes a central protrusion (4) and arm protrusions (5) (5) extending from the central protrusion (4) to both sides.
In the top view of the rake face (3), the central protrusion (4) has an inclination that gradually increases in the direction away from the main cutting edge (6). The arm protrusions (5) and (5) are composed of an upper arm portion (5a) on the side of the central protrusion (4) and a forearm portion (5b) on the side of the main cutting edge (6), and When using the centerline as a reference, the upper arm (5
a) constitutes the inclination angle θ ₁ = 30 ° to 60 °, and the forearm part (5
For cutting, characterized in that b) has a bending angle θ ₂ = 0 ° to 30 ° and has a relationship of θ ₁ > θ ₂ and extends toward the main cutting edge (6). Chips. 2. The cutting tip according to claim 1, wherein a raised protrusion (8) is added to a connecting portion of the central protrusion (4) and the arm protrusions (5) (5). Cutting tip to be used.