JPH0584603A - Throwaway tip - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain chips with high chip disposability and long life. [Constitution] A part of the cutting edge formed on the ridge line between the rake face and the flank face of the throw-away tip is chamfer honed, the honing width L is set to 1 mm or more, and the honing angle θ is 2 to 15 degrees. And

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away tip (hereinafter abbreviated as "tip") used for cutting metal materials and the like.

[0002]

2. Description of the Related Art If the cutting edge of a tip is sharp, the cutting edge is likely to be damaged during cutting, so that the cutting edge has conventionally been honed in a flat or curved shape. FIG. 2 shows an example of honing of the cutting edge of the tip, and (a) shows a cutting edge formed on the ridgeline between the rake face 2 and the flank face 4 in a plane shape with a honing width L and a honing angle θ. When chamfer honing (negative land) is performed, (b) is a case where the cutting edge formed on the ridge portion of the rake face 2 and the flank face 4 is notched in a curved shape with a radius R (= honing width M) and is round honed. Is. Honing is generally performed with honing widths L and M of about 0.05 to 0.5 mm and a honing angle θ of about 15 to 25 degrees.

[0003]

In the above-mentioned conventional honing tip, the chips cut by the cutting edge pass through the rake face of the tip while rubbing during cutting. Therefore, in the above-mentioned chip, heat generation due to friction between the chips and the rake face tends to shorten the life of the chip due to deterioration of high temperature strength and wear of the material. The present invention is based on the technical background as described above,
It is an object of the present invention to provide a chip having high chip disposability and a long life.

[0004]

According to the present invention, in a chip obtained by chamfering a cutting edge formed on a ridge portion between a rake face and a flank, a honing width L is 1 mm or more and a honing angle θ is set. It is set to 2 to 15 degrees. Of the two ridgeline portions of the chamfer honing cutting edge formed by honing, at least the ridgeline portion on the front flank side may be subjected to round honing or chamfer honing.

[0005]

In the chip having the above structure, the honing width L of the chamfer honing of the cutting edge is 1 mm.
As described above, the honing width L becomes a value larger than the tool feed amount, and the work material is cut by the honing portion of the cutting edge. Further, since the honing angle θ is 2 to 15 degrees, the chips pass through the honing surface and are then pushed out in a direction substantially parallel to the honing surface and divided by the bending action.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a negative type chip 6 having a substantially square shape in a plan view, and four cutting edge portions 12 extending from the corner portion to the right hand are provided at the ridges of the rake face 8 and the four flank faces 10 ... ... is formed. The cutting edge portion 12 is formed by honing (chamfer honing) the corner portion of the tip 6 into a substantially rectangular shape in a plan view, and the honing width L is 1 to 5 mm larger than the normal tool feed amount, and , Its honing angle θ is 2 to 15
It is set in the range of degrees. A ridge line portion 16 between the honing surface 14 and the rake surface 8 is provided with a minute round honing having a radius R of 0.1 mm. A through hole 20 is formed in the center of the chip 6, and the through hole 2
A lock pin (not shown) is inserted into 0 to fix the chip 6 to a bite (not shown).

When cutting the work with the tip 6 fixed to the cutting tool as described above, the honing width L is set sufficiently larger than the tool cutting amount k as shown in FIG. The cutting material is the honing surface 14 near the ridge line portion 18.
Is cut with. Then, the chips are extruded along the honing surface 14 in a direction substantially parallel to the honing surface 14, guided in a direction away from the rake surface, and divided by a bending action. At this time, since the cutting resistance in the chip discharge direction is reduced, the temperature rise of the tip 6 due to rake face wear is suppressed and the strength of the cutting edge is prevented from being reduced, and the chip disposability is improved and the life of the tip 6 is increased. To be done.

The honing angle θ is set in the range of 2 to 15 degrees, but if θ is less than 2 degrees, the life of the chip is not extended, and if θ is 15 degrees or more, cutting is performed. This is because the resistance becomes too large and the wear of the cutting edge increases, which shortens the life of the chips. FIG. 4 shows a chip in which a cemented carbide is coated with titanium carbide, titanium nitride and aluminum oxide is subjected to chamfer honing (round honing) under each condition, and the work material SCM415 is cut at high speed using these chips. In this case, the relationship between the cutting time (horizontal axis) and the wear amount of the flank (vertical axis) is shown. The honing condition is that the honing width L is all 3
mm, the honing angle θ was 0 degree (when the round honing with the radius R was 0.1 mm) was 5 degrees, 10 degrees, and 15 degrees. The cutting speed was 630 (m / min), the depth of cut was 1.0 mm, and the feed rate was 0.25 (mm / rev). In the figure,
When P1 is a circular honing with a radius of 0.1 mm, P2 is θ
Is 5 degrees, P3 has a θ of 10 degrees, P4 has a θ of 1
The case of 5 degrees is shown. From the figure, when the cutting time is 2 minutes or more, P3, P2, P4, P1
It can be seen that the wear amount decreases in the order of.

In the above embodiment, only the ridge line portion 16 is round honed, but in order to further improve the fracture resistance of the cutting edge, the ridge line portion 1 of the honing surface 14 and the flank surface 10 is increased.
It is also preferable to give 8 a slight round honing. Also, the honing is not a round honing but a honing width L
May be about 0.1 mm chamfer honing.

The chamfer honing of the chip 6 described above is not limited to the construction by grinding, but may be molding. In the above embodiment, only one side of the chip is honed. However, in the case of a double-sided type chip, it goes without saying that both sides of the chip may be honed.

[0011]

As described above, according to the present invention, in the chip formed by chamfering the cutting edge formed on the ridge line between the rake face and the flank, the honing width L is 1 mm or more, and Honing angle θ is 2 to 15 degrees
Since it is set to a certain degree, chip disposability is improved, and the chip life is extended. Also, of the two ridges formed by honing of the chamfer honing cutting edge,
By performing round honing or chamfer honing on at least the ridge portion on the flank side, it becomes possible to further enhance the fracture resistance of the honed cutting edge.

[Brief description of drawings]

FIG. 1 shows a chip according to an embodiment of the present invention, (a)
Is a plan view, (b) is a front view, and (c) is a side view.

FIG. 2 is a partial side view showing an example of honing of a cutting edge of a chip.

FIG. 3 is a cross-sectional view showing a cutting state.

FIG. 4 is a graph showing the relationship between cutting time and flank wear.

[Explanation of symbols]

 6 chip 8 rake face 10 flank face 14 honing face 16 ridge line part 18 ridge line part

Claims (2)

[Claims] 1. A throw-away insert obtained by chamfering a cutting edge formed on a ridge line between a rake face and a flank has a honing width L of 1 mm or more and a honing angle θ of 2 to 15 degrees. Throw-away tip that is characterized. 2. Of the two ridges formed by honing of the chamfer honing cutting edge,
A round honing or chamfer honing is applied to at least the ridge portion on the flank side.
Throw-away tip as described.