JPS59232702A - Diamond cutting tool - Google Patents

Abstract

PURPOSE:To obtain an excellently finished glass surface by providing on a diamond tip, a cutter edge and a back clearance face following said edge, on the basis of the rake face of a single plane. CONSTITUTION:Precision cutting of a face to be machined is performed by means of, for example, side part cutting edges 9 and 5 on the feed direction side of a diamond cutting tool. Subsequently, superprecision finishing by a central cutting edge 1 is further performed on the cut surface already machined by said cutting edges 9 and 5. Surface swell due to a previous process is improved through this finishing. Furthermore, feed marks called ''sawn trace'' are completely cleared away so that a glass surface with extremely excellent in no existence of roughness and swell of the finished surface can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diamond cutting tool for machining aluminum, copper, or an alloy material thereof into a precision finished surface such as a mirror surface.

Conventionally, in diamond cutting tools that cut and finish the disk-shaped surfaces of the above materials, the diamond tip attached to the cutting shank has a flat upper rake surface, and a rounded cutting edge forms at the tip of the rake surface. Since it is a sword cutting tool, even when cutting with a small cutting tool feed rate, feed marks called kerf marks were created on the cut surface, making it impossible to achieve a highly accurate mirror finish.

In addition, even if you use a plunge-cut diamond cutting tool to achieve a mirror finish and give the diamond cutting tool a lateral feed parallel to the end surface, the finished surface will be affected by the corner of the cutting tool tip on the feeding direction side. To avoid scratches, and as a countermeasure against this problem, tools were used that had a diagonal planar side relief surface at the corner of the tip of the cutting tool, but parallel to the upper edge and end surface of this side relief surface. In a lathe, etc. used for finishing cutting, when the cutting tool is given lateral feed at the intersection of the linear cutting edge ridges on the front of the cutting tool tip. Problems such as damage to the cutting surface of the end face have occurred due to spindle runout, vibration, and play in the table feeding mechanism.

A product devised to eliminate the above-mentioned problems and obtain a mirror surface with extremely good two-sided roughness and waviness was published in 1983.
It was a diamond cutting tool with a mirror finish on the end surface according to No. 46630.

To summarize, the rake face of the cutting edge of the diamond bite tip is a 6-semi-cylindrical face.

A planar rake face with a certain length and width is installed at the center of the top of the semi-cylindrical surface, and these rake faces, which are the six semi-cylindrical faces on both sides and the plane at the center, form a single This is the intersection line of the planar front flanks.

The cutting edge is formed by the arcs on both sides and the straight line in the center.
The rake angle of each of these rake faces is 0° to -10°.
is set to a negative value, and the front clearance angle of the front clearance surface is made very small (0°
~3°), precision cutting of the end face is performed by the arcuate cutting edge with a generally large radius of curvature when viewed from above, and the straight cutting edge in the center and the The protruding part of the undulations produced on the cut surface by the corresponding abdomen of the front flank surface was removed, and burnishing was performed to obtain a mirror surface with extremely excellent finished surface roughness and finished surface undulation.

The present invention was made based on the above-mentioned results with the object of providing a diamond cutting tool that is easier to manufacture and that can provide a mirror surface with extremely excellent finished surface roughness and finished surface waviness. be.

Hereinafter, the present invention will be specifically explained in detail with reference to the drawings.

A straight central cutting edge 1 having a length of -1.5 mm to 2.0 mm is provided horizontally at the center of the front surface of the diamond tip 18 of the diamond cutting tool shown in FIGS. 1 and 2. A single plane rake face 2 including the central cutting edge 1 and having a rake angle α of α−0 to +1° is set on the upper part of the diamond tip 18.

On the rake face 2, the center cutting edge 10 has both ends 3 and 4 approximately 4.0 mm in the direction perpendicular to the cutting edge 1. Arc-shaped cutting edges 5 and 6 with a radius R and a center angle θ of approximately 5 degrees are provided on both sides of the rake face centering on points M and N located on a large ship R of 0 mm. At the outer ends 7 and 8 of the cutting edges 5 and 6, straight cutting edges 9 and 10 are provided which are tangent to the arcuate cutting edges 5 and 6, respectively, and at the cutting edges 5, 9 and 6, 10. The length of the side cutting edge which forms the left and right side cutting edge ridges and is projected from the outer ends 11 and 12 of the cutting edge ridges 9 and 10 to the extension line of the central cutting edge 1! Y and Y are each 0.7 mm to 1.0 mm, and the width W of the diamond tip is W = 3.0 mm to 4.0 mm.
The front clearance angle β is β- with respect to the vertical plane extending downward from the cutting edge ridges 1, 5, 6 and 9, 10, respectively.
Front flank 13, 14, 15 and 1, such as 2° to 4
6 and 17 to constitute a diamond tip I8.

The diamond tip of the diamond cutting tool of the present invention has the configuration as described in Section 1.

When machining aluminum, copper, or other alloy materials into a precision finished surface such as a mirror surface using this diamond-cutting tool, the precision of the machined surface is maintained by the side cutting edge ridges 9 and 5 on the feed direction side of the diamond tool. perform cutting,
Subsequently by the central cutting edge 1, the side cutting edges 9 and 5
The cut surface is further processed and finished with ultra-precision, improving the surface waviness that occurred in the previous process and completely removing the feed marks called sawing marks.

A mirror surface with extremely excellent finished surface roughness and finished surface waviness can be obtained. Note that the linear side cutting edge 9 and the arcuate cutting edge 5 are tangential at the intersection 7 of these cutting edge edges, and the arcuate cutting edge 5 and the central cutting edge 1 are tangential. Since the cutting edge ridges are tangential at the intersection 3, the cutting edge 9 is tangential to the cutting edge 5, and as the cutting edge 5 approaches the central cutting edge l The cross-sectional width of the powder gradually becomes smaller and becomes almost zero at the intersection point 3 of the cutting edge ridges, which is an extremely favorable condition for precision cutting. Since they are tangential to the ridge 5 at their intersection point 3, the connection between the cutting edge ridges 1 and 5 is extremely smooth, and the transfer of finishing machining from the cutting edge 5 to the cutting edge 1 is extremely smooth. As a result, not only is the geometrical performance (surface roughness, waviness, etc.) of the finished surface excellent, but it also has the advantage of not having any negative effects on the inside of the material. The situation is exactly the same when a straight cutting edge 10 and an arcuate cutting edge 6 are used as the side cutting edges on the feeding direction side of the cutting tool.

As mentioned above, the diamond cutting tool of the present invention is relatively easy to manufacture because the cutting edge and the front flank connected to it are provided based on a single plane rake surface when manufacturing the diamond tip. In addition, the cutting edge and front flank are configured so that they are tangential at their joints, so the cutting and finishing work can be carried out extremely smoothly, and there is no possibility of machining distortion being applied to the workpiece. There isn't.

The surface roughness of the machined surface obtained by this diamond cutting tool is 0010 to 0.015 jLm Rn,
αX.

Maximum undulation is 0.020-0.023 pmWcm 1
)is.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the diamond tip of the diamond cutting tool of the present invention seen from the front, Fig. 2 is a plan view of the same diamond tip seen from above, and Fig. 3 shows the configuration of the diamond cutting tool of the invention. FIG. 1...Central cutting edge ridge, 2...Rake face, 5, 6...
Side arcuate cutting edge ridge, 9, 10... Side straight cutting edge ridge. 13... Center front flank, 14, 16... Right side front flank. 15, 17... Left side advancing surface, 18... Diamond tip, α... Rake angle of rake face 2, β...
Front clearance angle of front clearance surface, ・・・Length of central cutting edge 1 +
11, 13... Projection length of the side cutting edge ridge to the extension line of the central cutting edge 1, W... Width dimension of the diamond tip 18. R...Radius of the circle forming the arcuate cutting edge edges 5, 6. θ: The central angle that the arcuate cutting edge edges 5 and 6 form with respect to the center M or N of the circle that forms them. Patent applicant Tokyo Diamond Tool Manufacturing Co., Ltd. Representative Hama
1) Yoshihiro Patent Applicant-12-

Claims (1)

[Claims] 1. In a diamond cutting tool for processing aluminum, copper, or an alloy material thereof into a precision finished surface such as a mirror surface, the diamond is provided and the central cutting edge (1
), and the rake angle α is α=0° to +10. A single plane rake face (2) is set above the diamond tip 0→. Both ends (3) of the central cutting edge (1) on the rake face (2)
) and (4), approximately 4. O
On the left and right sides of the rake face, centering on the points (M) and (N) located on the huge ship R of mm, there is a radius R on both sides of the rake face, and its central angle 0 is approximately 5
' arcuate cutting edge edges (5) and (6) are provided, and points (3) and ( In step 4), a two-arc cutting edge (5) is formed so as to be tangential to the central cutting edge (1).
and straight cutting edge edges (9) and (ll'e) which are tangent to the arcuate cutting edge edges (5) and (6), respectively, at the outer ends (7) and (8) of (6), Blade ridge (5)/(9
) and (6), forming left and right side cutting edge ridges, respectively, and outer ends a0 and (6) of cutting edge ridges (9) and 01.
) to the length 12 of the side cutting edge projected onto the extension line of the central cutting edge (1) and! , are respectively 0.7 mm to 1.
0mm and the width W of the diamond tip is W = 3
．． 0 mm to 4.0 mm, the above cutting edge (
1) l The front clearance angle β with respect to the vertical plane downward from (5), (6) and (9) OQ is β-2'-
Front flank surface Q floor as if it were 4 degrees, θyu・0 o’clock and 0*−
That the diamond tip θ→ was formed by forming 0no! Timely diamond cutting.