JPH02198704A - Single crystal diamond bite - Google Patents

Abstract

PURPOSE:To improve wear resistance by forming a rake face so as make a radius at a bite nose part, forming a rake face so as to have a negative rake angle with roundness formed at a bite nose part, and forming the tip parts of the rake face and front face of relief so as to have a monocrystal diamond face. CONSTITUTION:A rake face 7 is formed so that the rake angle epsilon becomes at 15 deg. and a front face angle 8 of relief is formed so that a front a angle alphaof a relief becomes at 15 deg.. Also the tip pats of the rake face 7 and front face 8 of relief are formed both so as to have a monocrystal diamond face the 110. The roundness R of the rake face 7 is made in 1.5mm for instance and in the case of cutting ZuSe of crystal material, for example, the surface roughness Ra is kept in 0.01mum until the total cutting distance becomes in 10Km and the service life is remarkably prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a single crystal diamond cutting tool that can be used for ultra-precision cutting and the like.

[Prior Art] As single-crystal diamond cutting tools conventionally used for ultra-precision cutting, R cutting tools and flat cutting tools are mainly known. The R cutting tool is a cutting tool that has a curved cutting tool nose with a radius, and is suitable for cutting objects other than flat surfaces, such as aspherical shapes.

FIG. 2 is a perspective view showing an example of a conventional single-crystal diamond cutting tool, and shows an R cutting tool with a rake angle of 0°. In such a cutting tool, the rake face 1 is formed in the horizontal direction, and the front clearance surface has a front clearance angle α from the vertical direction.
It is formed to be inclined. In such a conventional cutting tool, the rake face 1 is made of single crystal diamond (110).
It is formed to be a plane or a (100) plane. Further, the front flank surface 2 is formed to be a (110) plane or a (100) plane.

FIG. 3 is a perspective view showing another example of a conventional single-crystal diamond cutting tool, and shows a cutting tool in which the rake face is formed to have a negative rake angle. By setting the rake angle to a negative value in this manner, surface roughness and the like can be improved in some cases. In such a cutting tool, a rake face 3 is formed by cutting out the nose portion of a cutting tool having a rake angle of 0° as shown in FIG. 2 so as to have a predetermined rake angle β. 5 indicates a plane before cutting out, for example, a (110) plane. Further, the front clearance surface 4 is formed to have a predetermined front clearance angle α. Note that 6 here indicates the (110) plane.

[Problems to be Solved by the Invention] As described above, in the conventional R cutting tool having a negative rake angle, the rake face is formed by cutting out the nose portion of the R cutting tool with a rake angle of 0° to a predetermined rake angle. Because of this, the (110) face, which is said to have the highest wear resistance, cannot be used as the rake face, and it is more prone to wear than the R cutter with rake angle 06 as shown in Figure 2. However, there was a problem that the lifespan was short. It is known that the wear characteristics of single crystal diamond differ by more than 100 times depending on the surface used.

An object of the present invention is to eliminate such conventional drawbacks and provide a single-crystal diamond cutting tool with excellent wear resistance.

[Means to solve the problem]

In the single-crystal diamond cutting tool of the present invention, the cutting tool nose is rounded and curved, and the rake face is formed to have a negative rake angle. Diamond (110)
It is characterized by being formed into a flat surface.

[Function] In the present invention, the (110) plane, which is the least abrasive plane in single crystal diamond, is used as the rake face. By using the (110) plane as the rake face in this way, the (110) plane itself is now used as the tip of the front flank, unlike the conventional method where the front flank was cut out by the front clearance angle from the (110) plane. It can be done. As a result, the tips of the rake face and front flank face can be made into (110) planes,
Abrasion resistance can be further improved.

[Embodiment] FIG. 1 is a perspective view showing an embodiment of the present invention. The rake face 7 is formed so that the rake angle β is 15°, and the front flank face 8 is formed so that the front clearance angle α is 15°. In addition, in FIG. 1, 9 is (
110) side is shown. rake face 7 and front flank face 8
The tips of both are formed to be (110) planes.

Further, the R of the rake face 7 is set to 1.5 mm.

Using such a single-crystal diamond cutting tool, Zn5e, which is a crystalline material, was cut. When using a conventional cutting tool as shown in Figure 3, the edge cutting distance is 3.
km, surface roughness Ra = 0.010 μm
However, when using the single crystal diamond cutting tool of this example, the edge cutting distance is 10 km.
It was possible to maintain this surface roughness until , and the service life was significantly extended.

[Effects of the Invention] As explained above, in the single-crystal diamond cutting tool of the present invention, the tips of the rake face and front flank face are formed to be the (110) plane of the single-crystal diamond. Compared to a cutting tool with a negative rake angle, the wear resistance is significantly improved, and the life of the tool can be significantly longer than before.

Therefore, the single crystal diamond bite of this invention is
It is particularly useful for ultra-precision machining of crystalline materials such as Zn5e, Zn5SGe and ceramics.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a perspective view showing an example of a conventional single-crystal diamond cutting tool. FIG. 3 is a perspective view showing another example of a conventional single-crystal diamond cutting tool. In the figure, 7 is the rake surface, 8 is the front flank surface, and 9 is (11
0) Show the surface.

Claims (1)

[Claims] (1) A single-crystal diamond cutting tool in which the cutting nose part is rounded and curved, and the rake face is formed to have a negative rake angle, and the tips of the rake face and the front flank face are monocrystalline. Diamond (110)
A single-crystal diamond bite characterized by being formed into a flat surface.