JPH04164505A - Throw away chip - Google Patents

Abstract

PURPOSE:To enhance controllability of chips, reduce cutting force, and perform suitable disposition of a cut-resistant material by improving longitudinal section shape and cross section shape based on the bisector of the nose part of first chip breaker. CONSTITUTION:First chip breaker 2 is formed at the nose part of a throw-away chip 1 in the form of triangle plate, and also second chip breaker 3 is formed at the parts of its both side regions. The longitudinal section in the direction of a bisector III-III at the nose part of the first chip breaker 2 is regarded to constitute a recessed curve part 2a formed by a curvature radius R1 inclined from the nose part 2a to a center boss surface 5. Also, a straight line part 2b that inclined toward a maximum depth part 2d and a recessed curve part 2c formed by a curvature radius R2 inclined from the maximum depth part 2d to the boss surface 5 are formed, wherein the relation of R2>R1 is constituted, a large tilt angle theta1 is constituted at the straight line part 2b, and the cross section is constituted with a recessed curve. With this constitution, enhancement of controllability of chips and reduction of cutting force are performed, and cutting of a cut-resistant material is suitably performed.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an indexable chip equipped with a first chip breaker and a second chip breaker, and is particularly suitable for cutting work materials such as mild steel and stainless steel. This is how it was done.

(Prior Art) Conventionally, this type of indexable chip has a first chip breaker in the nose portion and both of the first chip breaker and It is known that a second chip breaker is formed on the side. and,
In this case, the cross section of the nose portion in the bisector direction is formed by two different radii of curvature R1 and R2.

(Problems to be Solved by the Invention) The indexable insert seen in the above-mentioned publication has a depth of cut of 1 to 3mm+ and a feed of 0.1 to 0.3all.
/rev shows effective chip processing performance. However, when the depth of cut is less than 1 mm, there is a problem in that chip disposal is poor.

For this reason, in the present invention, improvements have been made so that chip disposal is effective even on the low depth of cut side and low cutting resistance is obtained.

(Means for Solving the Problems) The invention has been made in view of the above-mentioned points, and includes a first chip breaker in the nose portion and a second chip breaker in the side portion, and furthermore, This is an improvement based on the premise of an indexable insert with a center-down configuration in which the nose cutting edge ridge and the side cutting edge ridge are configured by the ridge.

That is, the first chip breaker has a vertical cross section in the bisector direction of the nose portion including a concave curved portion with a radius of curvature R1 from the nose side toward the central boss surface, a straight portion toward the maximum depth portion, and It is constituted by a curved portion that faces from the maximum depth toward the central boss surface and has a radius of curvature R2 larger than the radius of curvature R1. Further, in a cross section in a direction orthogonal to the bisector, the overall shape is a concave curve. Then, regarding the inclination angle with respect to the nose cutting edge ridge starting from the bisector, the curved portion with the radius of curvature R+,
The straight portion, the maximum depth portion, and the curved portion with the radius of curvature R2 constitute inclination angles θa, θ1, and θ6, respectively.

In this case, between these inclination angles, θ, 〉θ, 〉θ6〉
It changes depending on the relationship of θ6, and θb has a constant angle. On the other hand, the second chip breaker has a parallel width or the width is wider at the connection portion to the first chip breaker;
The sides change so that they become narrower in the center.

Furthermore, the above-mentioned straight nose cutting edge ridge is replaced with a concave nose cutting edge ridge, and the straight part in the longitudinal section in the bisector direction is replaced with a concave curved part. It provides:

(Function) In the indexable insert of the present invention, the first chip breaker disposes of chips during normal cutting, and the second chip breaker disposes of chips during face cutting and end face drawing.

In the indexable insert of the present invention, chips are effectively curled due to the cutting edge configuration below the core, making chip disposal effective. In addition, in the longitudinal section in the bisector direction on the nose portion side, there is a concave curved portion with a radius of curvature R, which facilitates chip disposal on the low depth of cut side.

(Embodiment) An embodiment of the indexable tip of the present invention will be described below with reference to FIG.

In FIGS. 1(a) and 1(b), (1) is an approximately triangular plate-shaped indexable chip, and a first chip breaker (2) is formed in the nose portion of the indexable chip, and a first chip breaker (2) is formed on both sides thereof. A second chip breaker (3) is formed on the edge portion. And throw away tip (1)
By contouring, a nose cutting edge ridge (4a) and a side cutting edge ridge (4b), each of which is linear in the illustrated case, are formed.

Also, the center boss surface (5) of the throw-away tip (1)
For installation, a hole (6) is drilled in the central boss surface (5).
), the nose cutting edge ridge (4a) and the side cutting edge ridge (4b) are below the center. This center drop amount is indicated by δ, and is set to δ=0.2 mm, for example.

The first chip breaker (2) has a radius of curvature R0 from the nose side toward the central boss surface (5), as shown in FIG. a concave curved portion (2a), a straight line portion (2b) toward the maximum depth portion (2d), and a maximum depth portion (2a).
A concave curved portion (2c) with a radius of curvature R3 extending from 2d) toward the central boss surface (5) is formed. In this case, the radius of curvature R2 has a relationship of Rz>R+ with the radius of curvature R1, and the straight portion (2b) forms a large positive inclination angle θ1.

On the other hand, in the cross section belonging to the widths a, b, and c in the direction orthogonal to the bisector of the first chip breaker (2), the entire Generally speaking, it has a concave curve. Therefore, regarding the inclination angle with respect to the nose cutting edge ridge (4a) starting from the bisector, the curved portion (2a) with the radius of curvature R1,
Straight line part (2b) and curved part with radius of curvature R2 (
2c) and the inclination angle θ1. θb and θ are constructed. The inclination angles vary according to the relationship θ, 〉θc〉θc, in order to improve the curling of the chips. In this case, the inclination angle θc is a constant angle from the viewpoint of stability of chip outflow.

On the other hand, the second chip breaker (3) is connected to both sides of the first chip breaker (2), and is connected in the transverse direction from the side cutting edge (4b) to the central boss surface (5). in,
The inclination angle θ2 is smaller than the inclination angle θ1 in the bisector direction described above. This is a consideration to increase the strength of the cutting edge.

And the second chip breaker (3) has a chamfer cutting,
The breaker width is narrow because it is used for applications such as end face cutting. In the case shown, the first chip breaker (
The width at the connecting portion to 2) is wide and narrow at the center of the side, but it can be changed to a parallel groove (not shown) depending on the cutting conditions.

Figure 8 shows the TPGTI shown in Figure 1 (a) lb).
It is an explanatory view showing chip disposability of the product of the present invention having a basic shape of 10204. The cutting conditions in this case are: cutting speed V = 100 m/min, depth of cut d = 0.
A work material made of 5IIS304 was cut at a feed rate of 5 to 2.0 mm and a feed rate of 0.05 to 0.3 mm/rev.

Moreover, FIG. 9 shows the present invention product A and JP-A-2-10961.
It is an explanatory diagram of the cutting resistance (combined force) compared with the conventional product B seen in Publication No. 2, and it can be seen that the product A of the present invention is lower at any feed rate.

Fig. 10 (al [bl and Fig. 1I] show modified examples, in which the straight nose cutting edge ridge (4a
) is replaced with a concave nose cutting edge ridge (4a), and the straight line portion (2b) in the bisector direction is replaced with a concave curved portion ++2b).

(Effects of the Invention) As explained above, the present invention improves the longitudinal and cross-sectional shapes of the first chip breaker (2) based on the bisector at the nose portion, so that stainless steel, etc. This material is suitable for difficult-to-cut materials.

Therefore, as shown in FIG. 8, the chip disposability is excellent, and as shown in FIG. 9, cutting resistance (combined force) is also reduced. It also has the advantage of being applicable to special purposes such as chamfer cutting and end face cutting.

[Brief explanation of drawings]

Figure 1 (al and fbl are diagrams showing an example of the indexable chip of the present invention); Enlarged front view,
Figure 3 is an enlarged sectional view taken along the line ■-■ in Figure 2, and Figures 4 to 6 are rV-rV in Figure 2.
Figure 7 is a cross-sectional view taken along the line ■-■ in Figure 1 fat, and Figure 8 is a cross-sectional view taken along the Fig. 9 is an explanatory diagram showing the chip disposability of the product of the present invention, and Fig. 10 is an explanatory diagram of the cutting resistance value comparing the product of the present invention and the conventional product.
b) is a diagram showing another embodiment of the indexable tip of the present invention, FIG. 10 fa) is a front view, and FIG.
) is a partial side view, and Figure 1) is a partial side view of the mower in Figure 10(a).
FIG. 3 is an enlarged cross-sectional view taken along the ℃ line. +Im-・Throwaway tip (21...First chip breaker (2a)...Curve part f2bl-...Straight line part (2c)-...Curve part (2dl-)
...Maximum depth part +3) -...Second chip breaker (4a)...Nose cutting edge ridge (4bl-...Side cutting edge ridge (51-...Central boss surface (+2b)
- Curved portion patent applicant Toshiba Tungaloy Corporation

Claims (2)

[Claims] (1) It has a polygonal plate shape, and its nose portion is equipped with a first chip breaker (2), and the side portions on both sides thereof are equipped with a second chip breaker (3), and its outer Depending on the ridge, the nose cutting edge ridge (4a) and the side cutting edge ridge (4b
), the nose cutting edge (4a) and the side cutting edge (4b) are
The first chip breaker (2) has a straight line shape below the center boss surface (5), and the first chip breaker (2) extends from the nose side to the center in a longitudinal section in the direction of the bisector of the nose portion. Boss side (5)
A concave curved portion (2a
), a straight line section (2b) toward the maximum depth section (2d), and a straight section (2b) toward the central boss surface (5) from the maximum depth section (2d);
Moreover, the radius of curvature R_2 is larger than the radius of curvature R_1.
It is composed of a concave curved portion (2c) consisting of a concave curved portion (2c), and in a cross section in a direction orthogonal to the bisector, the whole exhibits a concave curve,
Moreover, the nose cutting edge ridge (4a) starting from the bisector
Regarding the inclination angles, the inclination angles θ_a and θ_b are obtained for the curved part (2a) with the radius of curvature R_1, the straight part (2b), and the curved part (2c) with the radius of curvature R_2, respectively.
and θ_c, and between these inclination angles, θ_
It changes according to the relationship a>θ_b>θ_c, and θ_b
The second chip breaker (3) has a parallel width, or the width is wider at the connection part to the first chip breaker (2) and narrower at the central part of the side. A throw-away tip that is characterized by changing. (2) The straight nose cutting edge ridge (4
a) is replaced with a nose cutting edge ridge (4a) exhibiting a concave shape, and the straight line portion (2b) in the vertical cross section in the bisector direction according to claim 1 is replaced with a concave curved portion (4a).
12b) is replaced by an indexable tip.