JPH09314406A - Hard cutting tip and its manufacturing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hard cutting tip having characteristic of non-breakable, non-scale-off, and long life with high precision. SOLUTION: In a cutter chip wherein hard sintered member 6 like diamond or CBN, and hard alloy like hard base member 5 are integrally joined, the hard sintered member 6 is joined at the point on the sloped surface C formed by connecting the rake face and the flank of the hard base member 5, and the tip portion of chip is formed by the ultra hard sintered member 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diamond cutting tool used for cutting difficult-to-cut materials such as noncombustible building materials, plywood, carbon, FRP, and non-ferrous metals, and a CBN cutting tool used for cutting iron and other steels, and particularly for the cutting. Regarding chips.

[0002]

2. Description of the Related Art As a cutting tip of this kind, there is known a cutting tip in which a blade portion made of a diamond sintered body is joined to a cemented carbide substrate in one body. Japanese Utility Model Publication No. 5-6004 proposes a useful tool material in which the outer diameter of the cemented carbide substrate bonded to the diamond layer is larger than the outer diameter of the diamond layer. I have.

[0003] The structure of a cutting tip is disclosed in Japanese Utility Model Publication No. 5-6003. In a tip comprising a diamond layer and a cemented carbide substrate, the entire flank face is formed by a diamond layer, and the thickness of the layer is determined. To a thickness that is held directly against the tool body.

[0004]

The above-mentioned proposals have respective effects on the manufacturing cost and quality, but the present application intends to obtain the same or new effects by other means. is there.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a cutting tip in which an ultra-hard sintered body and a hard base material as a backing thereof are joined into one body, and the cutting pressure applied to the cutting edge of the ultra-hard sintered body is
It is characterized in that the shape and dimensions of the cutting edge portion are specified in order to prevent the cutting edge portion from being chipped and peeled off by vector dispersion on the hard substrate.

The specified shape and size means that the superhard sintered body forming the cutting edge portion is joined to the hard substrate on the inclined surface connecting the rake face and the flank face on the cutting edge side. is there.

The cutting tip exerts its function most when the rake face is positioned in the rotational direction and the hard substrate is brazed or mechanically fixed to the tool body.

The cutting tip is prepared by a step of preparing a chip material made of a plate-shaped super-hard sintered body whose lower surface is lined with a hard base material, and a cutting plane having an inclination angle in the vertical direction. To cut into a large number of pieces, the step of making the side of the cutting plane that contacts the side surface of the super-hard sintered body at an obtuse angle a rake surface, and the blade angle within 90 ° and exposing the hard base to the lower end side of the flank. Then, the interface between the hard base and the super-hard sintered body is formed as a slope facing the cutting edge, so that the flank face is subjected to a removal process, whereby it can be easily manufactured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described with reference to embodiments.

[0010]

EXAMPLES FIGS. 1 (a) and 1 (b) are schematic front views of a diamond circular saw for cutting and trimming non-combustible building materials in a partially cutaway front view and an enlarged side view of a tip used therein. . In the figure, 1 is a tool base having an outer diameter of 240 mm, 2 is a chip having a blade width of 10 mm and 12 teeth, 3 is a fastening fixture, and 4 is a mounting hole having a hole diameter of 25.4 mm.

The tip 2 is obtained by joining a diamond super hard sintered body 6 to the tip of a hard base body 5 made of a cemented carbide on an inclined surface C connecting the rake face A and the flank face B into one body. Has been formed.

The formation of the rake angle on the tip 2 is 0 °
Thus, the blade angle β is 55 ° and the clearance angle α is 35 °. When the tip 2 is attached to the tool base 1 by the tightening fixture 3, the attachment angle is determined so as to match the required rake angle γ. In the embodiment, the angle is set to 20 °. The arrow indicates the rotation direction of the circular saw.

Using the circular saw having the above structure,
When the joint part of the special plywood was processed (combining and trimming), a beautiful machined surface free of burrs and fluff was obtained at high speed. In addition, the super-hard sintered body 6 is the hard substrate 5
There was no peeling and the life was extremely long.

2 and 3 show an embodiment for explaining one of the methods for efficiently and economically manufacturing the chip 2 used above. First, as shown in FIG. 2, a thickness of 0.7 m is formed on the upper surface of the cemented carbide disc 7 having a diameter of 60 to 80 mm and a thickness of 9.3 mm.
A chip material 9 in which m diamond sintered bodies 8 are bonded together is prepared.

This chip material 9 has a constant inclination angle θ of 30 to 35 ° in the vertical direction and a width P of 1.5 to 2.
With a constant width of 0 mm, a large number of cut pieces 10 are cut by wire cutting. In this cutting piece 10, FIG.
The side 11 of the cutting plane that contacts the super-hard sintered body 6 at an obtuse angle is used as a rake face, and E is obtained by wire cutting from the flank of the super-hard sintered body 6 so that the blade angle β is 90 ° or less. -Erasing is done with E line

In the embodiment, the inclination angle θ is 35 ° and the blade angle β is 55 °. Then, the exposed portion 12 of the hard substrate 5 is formed at the lower end of the flank β by the removal process,
The interface between the superhard sintered body 6 and the superhard sintered body 6 is an inclined surface C facing the cutting edge.

The fact that the interface with the exposed portion 12 is formed by the inclined surface C increases the holding force of the blade portion made of a super-hard sintered body when it is attached to the tool base and is cut, and the cutting pressure is increased. The vector dispersion effect is exerted and the life of the chip is increased. The configuration of the portion of the hard base 5 other than the blade portion is
It may be selected according to the mounting form of the tip to the tool base, and in the case of the figure, it is finished by cutting by the FF line and finished perpendicular to the rake face.

FIGS. 4A and 4B show another embodiment showing a cutting tip which can be commonly used for a circular saw using a conventional standardized cemented carbide cutting blade. In the figure, 1
Reference numeral 3 is a pin hole having a diameter of 3 mm or 4 mm, and the side surface other than the blade portion made of the cemented carbide 6 is also formed with an attachment angle X of 30 ° or 35 ° according to the cemented carbide tip. Therefore, the tip 2 alone or the tip 2 and the tip made of cemented carbide can be mixed and used by attaching to the conventional circular saw mother body.

FIG. 5 is a schematic view showing an embodiment of a router (end mill for woodworking), in which a tip 2 is attached to a tool base 1. The arrow indicates the direction of rotation. The flank end of the inclined surface C where the hard substrate 5 of the chip 2 and the super-hard sintered body 6 are joined in this embodiment reaches the bottom surface of the hard substrate 5. This is because, for woodworking, the cutting pressure is relatively low, and even if it is formed in this way, it is possible to perform cutting without any problem. Therefore, it goes without saying that the flank-side end of the inclined surface C may be changed to form the exposed portion 12 of the hard substrate 5 in the flank as shown in FIG.

In the above embodiments, the diamond sintered body was used as the superhard sintered body, and the circular saw and the router using the cemented carbide as the hard substrate were shown.
Other materials such as N and cermet can be used, or they can be used as other cutting tips. Further, the cutting and deleting processes have been described by using the wire cutting, but it goes without saying that other processing methods such as laser processing and grinding may be used.

[0021]

According to the cutting tip of the present invention, since the force for holding the blade portion superhard sintered body 6 of the hard substrate 5 at the time of cutting is strong and the cutting pressure is vector-distributed, the blade portion is damaged. It is difficult to cause peeling and peeling, and it is possible to perform long-life and highly accurate cutting.

[Brief description of drawings]

FIG. 1 is a schematic view illustrating a circular saw of an embodiment, (a) is a front view with a part cut away, and (b) is an enlarged side view of a chip used for it.

FIG. 2 is a side view of a tip material prepared for producing a cutting tip.

FIG. 3 is a side view of a cut piece for explaining a state in which a cut piece obtained by cutting a chip material is subjected to a deletion process.

FIG. 4 shows another embodiment of a circular saw chip, (a) is a front view and (b) is a sectional view taken along line AA.

FIG. 5 is a perspective view showing an outline of an embodiment of a router.

[Explanation of symbols]

1 Tool Base X Mounting Angle 2 Tip, Cutting Tip EE Deletion Line 3 Clamping Fixture FF Deletion Line 4 Mounting Hole 5 Hard Base 6 Super Hard Sintered Body 7 Cemented Carbide Disc 8 Diamond sintered body 9 Chip material 10 Cutting piece 11 Side contacting at an obtuse angle 12 Exposed part of hard substrate 13 Pin hole A Rake surface B Flank surface C Inclined surface β Cutting edge angle α Clearance angle P Cutting width

Claims (3)

[Claims] 1. A cutting method in which a super-hard sintered body obtained by sintering diamond and / or cubic boron nitride (CBN) and a hard base made of a hard metal, a cermet or the like are joined into one body. In the chip, the super-hard sintered body is
An ultra-hard cutting tip, characterized in that it is joined on an inclined surface connecting a rake face and a flank of a hard base body, and a cutting edge portion is formed of the hard sintered body. 2. The rotation according to claim 1, wherein the rake face of the tip is positioned in the rotational direction, and the hard base of the tip is brazed or mechanically fixed to the tool body. Cutting tools. 3. Diamond and / or CBN is provided on the upper surface of a flat hard substrate made of cemented carbide, cermet or the like.
The step of preparing a chip material formed by forming the ultra-hard sintered body layer, the step of cutting the chip material into a large number by a cutting plane having an inclination angle in the vertical direction, and a cutting plane of the cutting piece The step of making the rake surface the side that makes an obtuse contact with the side surface of the super-hard sintered body of, and the blade angle within 90 °,
And exposing the hard base to the lower end side of the flank and forming the interface between the hard base and the super-hard sintered body on the slope facing the cutting edge, so that the flank is subjected to a deletion process. A method for manufacturing a tip for ultra-hard cutting.