JPH04141304A - Throw away tip - Google Patents

Abstract

PURPOSE:To suppress deterioration of abrasion resistance in a throw away tip having a wavy form cutting edge forming peak and valley portions on a rake face by performing honing of the rake face so that honing amount is larger at the peak portions than at the valley portions. CONSTITUTION:On a central boss surface 2 of a triangular throw away tip 1, a clamping hole 3 is provided. On the outer edge portion of the throw away tip 1, wavy form cutting edge 4 is provided so as to form peak portions 4a and valley portions 4b on a rake face. The cutting edge 4 is processed by honing so that honing amount is larger at the peak portions than at the valley portions. Thus, chipping of the peak portions 4a due to collision of chips against the peak portion 4a is prevented, and deterioration of abrasion resistance is prevented as much as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an indexable insert, and in particular, the cutting edge thereof is honed to strengthen the cutting edge.

(Prior Art) Conventionally, in order to strengthen the cutting edge of an indexable insert, arc honing, angle honing, etc. have been performed. Japanese Patent Publications No. 53-25392 and Japanese Patent Publication No. 10843/1984 disclose indexable inserts in which the amount of honing is greater on the flank side than on the flank side. In this case, in the direction along the edge of the cutting edge, the amount is constant.

(Problem to be solved by the invention) However, as shown in FIG.
In cutting where the depth of cut (j) is large and chips with a slight upcurl are generated, the amount of honing is constant, so the curled chips (11) collide with the cutting edge (4) and the cutting edge ( In particular, the cutting edge (4), which has a waveform of 51 on the rake (5) side as shown in the figure, was sometimes chipped.
), the chips collide preferentially with the mountain part (4a), and 1
．． 1.1 part (4a) was easily chipped. The easiest way to prevent chipping is to perform a honing process, but if the honing process is increased, there is a problem that the wear resistance will decrease at the same time.

For this reason, in the present invention, the honing shape has been modified to prevent chips from chipping and to prevent a decrease in wear resistance in an indexable insert equipped with a wavy cutting edge. It is i).

(One step to solving the problem) The invention is based on the points mentioned in 1. The honing treatment applied to
It is +f/i made to be more personable than ;

(Function) Throw-away tip of the present invention! J. The chipping resistance is improved by the honing process, and the amount of honing on the peaks is more sensitive than the honing on the valleys: 1j, which reduces the amount of chips. This prevents the 111th part from chipping due to IIi impact. Further, by making the amount of honing in the troughs smaller than +11 parts, a drop in wear resistance is prevented as much as possible.

(Example) Hereinafter, an example of the indexable tip of the present invention will be described with reference to the drawings.

In Figures 1 to 3, (1) is, for example, a triangular-shaped slow-awake chip, and its central boss (2) has a hole (3) drilled therein. The external ridgeline part has 111 parts (4a) on the rake face side;
The wavy cutting edge (4b) is formed to form a groove (4b).
) and this cutting edge (4) is honed.
Honing at the peak (4a) as shown in the figure
11. is larger than the horning inn in Tanibe (4b). In this case, the width on the rake face (5) side)
, 1 and 11. The magnitude relationship (+,, l> 1-, 2
1 is reduced.

Further, in FIGS. 4 to 8, honing shapes applicable to the present invention are shown, respectively.

That is, in FIG. 4, the width of the scoop (5) side and the flank (6) side is 1. ．． A circular arc shape with a radius of curvature of 1 and a diameter of 1 is shown. Furthermore, FIG. 5 shows the large arc and ten small arcs J5 whose curvature radii are R, , R, respectively, and FIG. The arc J1 is 4<.

Furthermore, Fig. 7 shows the angle type with the inclination angle O, and Fig. 8 shows the angular type with an inclination angle of O.
6) The side width '' is increased, and the radius of curvature R,,I
In the throw-away tip of the present invention, the size of the honing: +; is, for example, fl, 3 in terms of the width 14.
Generally, it is conveniently used as 1 mm or more, especially 00 mm.
3~T1.1mm is the most common9.And in the indexable tip of the present invention, considering the case where the inscribed circle is φ12.7mm, the honing width I,2 of the valley part (4b) is 14□0
, 03mm, if the honing width 11 of the 111 part (4++) is about 1°0.05mm, or if the cutting conditions are raised, l 2 = 0. (15m
m, 1. , = about 0.10 mm satisfies both chipping resistance and wear resistance. Next, the comparison results of the cutting test of the product of the present invention and the conventional product will be explained based on Tables 1 and 2.

The cutting in Table 1 is a comparison of fracture resistance due to chips. The workpiece material is SCM415, and the specifications of the slow Aukoi tip (1) are CNM.
It has a G1204 round shape as a basic shape and is equipped with a dip breaker, and is coated with a hard layer of riC-A°C of 20.1°C. The cutting conditions at this time are cutting speed f50
m/min, depth of cut 4mm, feed 05mm/rcv
It was cut for 5 minutes.

Table 1 The results are as shown in Table 1, and while the deficit confirmation of the conventional information was 87.5%, the present invention'i7+
The probability of loss was 0%.

In addition, the cutting conditions in Table 2 compare the wear resistance, but the conditions that differ from those in Table 1 are 1, I, and I.
, 2 were changed, and the work material was cut for 30 minutes with a 345C1 feed of 0.3 mm/rev. In this case, the reason why the work material was 345G was to increase the hardness and differentiate the wear resistance.

Table 2 (Effects of the Invention) As explained below, the present invention has a
In the throw-away insert, which is provided with a cutting edge ridge (4) having a waveform forming a portion (4a) and a trough portion (4b), the amount of honing at the crest portion (4a) is equal to that of the trough portion (4b). The honing amount is larger than the honing amount.

Therefore, in the present invention, chipping due to collision of chips at the peaks (4a) is prevented, and the honing H,1 at the valleys (4b) is smaller than the honing arsenal at the peaks (4a), thereby improving wear resistance. This has the advantage of suppressing the low voltage.

[Brief explanation of drawings]

Fig. 1 (a) (bl is a diagram showing an embodiment of the indexable tip of the present invention, Fig. 1 (fat) is a front view, Fig. 1 (fbl) is a partial side view, and Fig. 2 is a 1 figure fal
-6 (<enlarged sectional view, Figure 3 is a partially enlarged sectional view taken along the +n-m line in Figure 1(a), 8 are partially enlarged cross-sectional views showing honing shapes applicable to the present invention, and FIG. 9 is a conceptual diagram showing the cutting state. (1) Throwaway tip (4) ... Cutting edge ridge (4a)...
+1. + part (4b)...each part (
5) Rake face (6) Relief face

Claims (1)

[Claims] It is composed of a circular plate and a polygonal plate shape, and its external ridgeline portion has peaks (4a) and valleys (4b) on the rake face (5) side.
In the indexable insert provided with a wave-shaped cutting edge ridge (4), the cutting edge ridge (4)
The honing treatment applied to the indexable tip is such that the amount of honing at the crests (4a) of the waveform is greater than the amount of honing at the troughs (4b).