JPS60108203A - Cutting tool - Google Patents

Abstract

PURPOSE:To improve efficiency by forming a raking face with a land face of predetermined width and rake angle and with a main raking face of a predetermined rake angle and by constructing predetermined brakers on the main raking face in a cutting tool for grooving. CONSTITUTION:A raking face 1 is formed with a land face 11 of width of 0.1mm. and rake angle of 0 deg. and with a succeeding main raking face 12 of rake angle of 10 deg. and a first step portion 13 is formed at the position of 0.5mm. far from a boundary A of the land face 11 and the main raking face 12 as a first braker. The height of the step portion 13 is made 0.09mm. to the main raking face 12. A second step portion 14 is formed at the position of 0.5mm. from the first step portion 13 as a second braker. A flank 2 is constructed with a vertical face 21 of with of 0.5mm. and with a main flank 22 of relief angle of 5 deg. from the edge tip. By this construction, a cutting tool suitable for grooving and a long strip or triangular throw-away tip can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to cutting tools such as indexable tips. In particular, the present invention relates to a cutting tool suitable for grooving the outer circumferential surface of a columnar (cylindrical) shaped body.

[Prior Art] Conventionally, low-grade hides have been mainly used as cutting tools for grooving. Recently, the idea of a cutting tool has been extended to a rectangular indexable tip, and the idea of a thread cutting tool has been extended to a triangular indexable tip. Such traditional rectangular or triangular indexable tips are
The rake angle was about 15 degrees, the front relief angle was about 5 degrees, and the breaker was installed several mm from the edge of the cutting edge. However, the breakers of conventional indexable inserts could not function as a breaker for the most part, probably because the distance from the tip of the cutting edge was too long.

[Object of the Invention] An object of the present invention is to provide a cutting tool particularly suitable for grooving. A further object of the present invention is to provide a rectangular or triangular indexable insert suitable for grooving.

[Structure of the Invention] The cutting tool of the present invention has a rake face formed at the tip of the cutting edge, a runt face having a width of 0, 08 to 0, 2 mm and a rake angle of 0°6 degrees or less, and a runt face formed at the tip of the cutting edge, and a runt face having a rake angle of 0°6 degrees or less, The angle is 8 to 1
5 degree main rake face, and a first stage portion serving as a first breaker is provided on the main rake face at a position of 0.4 to 0°7 mm from the boundary with the runt face. It is something to do.

[Detailed Description of the Structure of the Invention] The cutting tool of the present invention is mainly used as a throw-away tip. However, it is not limited to throw-away chips. A rectangular or triangular shape is particularly suitable for the indexable tip. The quality of the cutting tool is not particularly limited, but a cermet type is most suitable.

The cutting tool of the present invention is characterized by the configuration of the rake face. Therefore, the overall shape of the cutting tool other than the rake curve, the shape and configuration of the flank surface, etc. can be arbitrarily selected from conventional shapes and configurations depending on the intended use.

The rake face of the cutting tool of the present invention is composed of a runt face and a main rake. The runt surface is [11 is 0°08~0.
At 2m+n, the rake angle of the land surface is 0.5 degrees or less, preferably in a horizontal state. The main rake face is formed following the land surface, and the rake angle of the main rake is 8 to 1.
It is 5 degrees. A first breaker is formed on this main rake face. The first breaker is 0.4 from the boundary with the runt surface.
It is configured as a first step portion located at a position of ~0.7 mm.

Furthermore, it is preferable to provide a second step section that serves as a second breaker behind the first step section. The position of the second step is 0 from the first step.
．． Preferably, the distance is 4 to 0.7 mm.

[Effects of the Invention] In the cutting tool of the present invention, the rake face is composed of a runt face and a main rake face. This land surface improves the strength of the tip of the cutting tool and reduces chipping of the tip of the cutting tool.

In addition, the distance of the first stage section, which becomes the first breaker, from the boundary with the runt surface is shortened to 0.4 to 0.7 mm, making it possible to effectively curl the chips. . In particular, by providing the second step section 0.4 to 0.7 mm behind the first step section to form the second breaker, the curling of the chips becomes even more reliable.

The cutting tool of the present invention is particularly suitable for grooving.

[Example] Example 1 A side view of a cutting tool according to a first example of the present invention is shown in FIG. 1, an enlarged sectional view of the tip of the side view is shown in FIG. 2, and a front view is shown in FIG. 3. The main dimensions and angles of the cutting tool of this example are shown in FIGS. 1 and 2.

This cutting tool is a strip-shaped indexable tip made of tough cermet (titanium nitride alloy). The approximate dimensions of this cutting tool are a total length of 20M, a width of 3mm, and a height of 6mm. And this short 11
Cutting edges are formed at both ends of the 1f-shaped cutting tool.

As shown in Fig. 2, which is an enlarged cross-sectional view of the tip of the cutting edge, the rake face l has a land surface 11 with a width of 0.1 mm and its land surface 1.
1 and a main rake face 12 with a rake angle of 10 degrees. The rake angle of the runt surface 11 is 0 degrees. A first step portion 13 is formed at a position 0.5 mm from the boundary A between the land surface 11 and the main scoop 12, and constitutes a first breaker. The height of the first step portion 13 is 0 with respect to the main rake face I2.
．． It has a height of 09 Shizuku. The second step portion 14 is provided at a position further 0.5 mm from the first step portion 13 and forms a second breaker. The area behind the second step 1/l is formed of a surface having the same height as the land surface 11.

Regarding the clearance surface 2, a vertical surface 21 having a width of 0.5 mm is formed from the tip of the cutting edge, and a main clearance direction 22 is formed following the vertical surface 21. The clearance angle of the vertical surface 21 is 0 degrees, and the clearance angle of the main clearance surface 22 is 5 degrees.

The structure of the cutting tool according to the first embodiment of the present invention is as follows.

Using this cutting tool, it was attached to a general-purpose or numerically controlled lathe, and a groove of 1115 to 12 mm and depth of 3 to 5 mm was machined on the outer peripheral surface of a cylinder (material: 545C) with a diameter of 50 to 150 mm. The cutting conditions at this time were a cutting speed of 190 m/m.
in, ~260m/min, feed 0.1mm/re
It is v. Through this process, the chips were almost certainly cut to a length of about 30 mm.

In addition, the machining was extremely smooth, and the machined surface had an almost mirror finish.

Embodiment 2 A plan view of a cutting tool according to a second embodiment of the present invention is shown in FIG. 4, and a side view is shown in FIG. 5. This cutting tool has a triangular indexable tip.

The approximate dimensions of this cutting tool are approximately 5 mm thick and a triangular inscribed circle having a diameter of 15 mm. and each top 3 of the triangle
Cutting edges are formed at these locations. The rake face 3 and flank face 4 of this cutting tool are constructed in the same manner as the rake face and flank face of the first embodiment.

[Brief explanation of the drawing]

1 to 3 show a cutting tool according to a first embodiment of the present invention, FIG. 1 is a side view thereof, FIG. 2 is an enlarged side view of the tip,
FIG. 3 is a plan view. 4 and 5 show a cutting tool according to a second embodiment of the present invention, FIG. 4 is a plan view thereof, and FIG.
The figure is a side view thereof. 1.3...Running surface 2.4...Running surface Patent applicant Toyota Automobile Co., Ltd. HA li! Factory agent Patent attorney Hiroki Okawa Patent attorney Shudo Fujitani Patent attorney Akio Maruyama 1 Figure 2

Claims (4)

[Claims] (1) The width of the rake formed at the tip of the cutting edge is 0°08~
Consisting of a runt surface with a rake angle of 0.2 mm or less of 0.5 degrees, and a main rake surface following the runt surface and a rake angle of 8 to 15 degrees, the main rake surface has a rake angle of 8 to 15 degrees. 0 from the boundary
．． A cutting tool characterized in that a first step portion serving as a first breaker is provided at a position of 4 to 0.7 mm. (2) The cutting tool according to claim 1, wherein a second step portion serving as a second breaker is provided at a position of 0.4 to 0.7 fences from the first step portion. (3) Claim 1, which is a throw-away tip
Cutting tools listed in section. (4) The cutting tool according to claim 1, wherein the abrasive material is cermet.