JPH04256513A - End mill or blade - Google Patents

Abstract

PURPOSE:To increase anti-wear property of a tool by metal-bonding super hard crystal particles such as diamond or cubic crystal boron nitride, etc., onto the blade of a tool main body by a sintering process or electrodeposition process. CONSTITUTION:Metal bonding is conducted onto the blade of a tool main body by sintering process or electrodeposition process. Also a hard film such as chromium, etc., is coated on it. Thus both excellent anti-wear property and tool form can be obtained at a time, and the wear of a cutting edge can be suppressed by the effect of the hard film so as to keep its sharpness.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a blade for an end mill or indexable cutter for cutting graphite coated with ultra-hard crystal grains such as diamond or cubic boron nitride (hereinafter referred to as CBN) by sintering or electrodeposition. It is related to.

0002

2. Description of the Related Art Electric discharge machining is increasingly being used for machining highly hard materials or for machining complex shapes such as ribs and grooves in molds. Electrodes formed into a desired shape are used as tools for electrical discharge machining, and among these electrodes, graphite electrodes are attracting attention and are being used more frequently. However, since graphite is generally hard and brittle, it is easily damaged during electrode processing. In addition, graphite tends to cause wear, and cutting tools such as end mills and throw-away cutters are subject to severe wear and tear. This reduction in sharpness due to wear and tear on the tool has a large effect on graphite chipping.

[0003] Therefore, in order to reduce wear and tear on cutting tools,
The tool was made compatible with graphite cutting by using wear-resistant cemented carbide and by selecting appropriate cutting edge specifications and cutting conditions.

0004

[Problems to be Solved by the Invention] Expectations for cutting graphite are extremely high when electrical discharge machining is performed. However, in the conventional technology, even if the tool specifications are improved, the effect is still small, and even if the cutting conditions are lowered, there are problems with machining efficiency, and the effect is not very noticeable.

Regarding tool materials, there are ceramics, CBN, diamond, etc., which have better wear resistance than cemented carbide, but due to the nature of the materials, chipping is likely to occur during cutting, and the tool material itself is susceptible to being machined. However, there was a problem in that the optimum tool shape for cutting graphite could not be freely obtained. The present invention aims to eliminate the above-mentioned drawbacks and provide an end mill or blade that is easy to manufacture and suitable for cutting graphite.

[0006]

[Means for Solving the Problems] In order to achieve the above-mentioned objects, the present invention provides a cutting edge or blade of an end mill in which ultra-hard crystal grains such as diamond or CBN are sintered or electrodeposited. In addition, by coating a hard substance on top of it, we prevent the ultra-hard crystal grains from falling off, and the synergistic effect improves tool life and makes graphite easier to cut.

As a tool for cutting graphite, end mills or blades made of high-speed tool steel or cemented carbide are in fact easy to obtain cutting edge specifications suitable for the workpiece material. On the other hand, it is well known that diamond and CBN have extremely high hardness and excellent wear resistance. By sintering or electrodepositing these ultra-hard crystal grains on the blade portion of a graphite cutting tool, the graphite cutting tool is provided with better wear resistance. Furthermore, by coating the hard material on top of the hard material, it is possible to prevent the ultra-hard crystal grains from falling off, and the synergistic effect has the effect of keeping the cutting edge sharp and maintaining better cutting quality. Furthermore, since the sintering or electrodeposition of ultra-hard crystal grains and the coating of hard materials are post-processing, manufacturing is easy and the tool shape can be freely obtained.

[0008]

Embodiment FIG. 1 shows an embodiment of the present invention. Grain size #2 on the blade of an end mill made of tempered high-speed tool steel.
00 diamond crystal grains are electrodeposited, and then a hard chromium film of 3 μm with a hardness of HV900 is electroplated on top of the diamond crystal grains.
m coated. This significantly increased durability.

[0007]

As described above, according to the present invention, excellent wear resistance and tool shape can be obtained at the same time, so wear and tear on the cutting edge can be suppressed, sharpness can be maintained, and graphite, which is the work material, can be cut easily. There is no breakage during machining, machining efficiency is improved, and it can be used for continuous cutting of graphite.

[Brief explanation of the drawing]

FIG. 1 shows a side view of one embodiment of the invention.

FIG. 2 is an enlarged view of the cutting edge and outer circumferential cross section of FIG. 1;

[Explanation of symbols]

11 Main body 12 Blade part 13 Shank part 14 Neck 15 Cutting edge 16 Blade groove 17 Diamond crystal grains 18 Hard chrome film 19 Base material

Claims (2)

[Claims] Claim 1: In a tool body provided with a cutting edge having a cutting edge, ultra-hard crystal grains such as diamond or cubic boron nitride are metal-bonded onto the cutting edge by a sintering method or an electrodeposition method. An end mill or blade characterized by being coated with a membrane. [Claim 2] The hardness of the hard film is HV by electroplating.
The end mill or blade according to claim 1, characterized in that the end mill or blade is specified for hard chrome plating of 800 or more.