Diamond-coated rotation cutting tool
A cutting tool and diamond technology, which is applied in the field of diamond-coated rotary cutting tools, can solve the problems of increasing the retraction speed of the tool tip and shortening the tool life, and achieve the effect of preventing defects and smoothing the machined surface.
Active Publication Date: 2020-05-15
MITSUBISHI MATERIALS CORP
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Problems solved by technology
[0010] However, in the methods described in these patent documents, chipping of the cutting edge tends to occur or the diamond coating of the cutting edge is thinner than that of the untreated state, so there is a shortened tool life such as an increase in the retraction speed of the cutting edge due to wear. The problem
Method used
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[0098] A ball nose end mill (a double-edged ball nose end mill with a diameter of 2.0 mm) of this embodiment was actually manufactured. First, by the hot-wire CVD method under the conditions shown in Table 1, a polycrystalline diamond coating having a two-layer structure with different average particle diameters was formed on a tool base.
[0099] The material of the filament was 99% by mass of tungsten, and the diameter of the filament was 0.4 mm. The distance between the tool base and the filament was kept at 10 mm, and the filament was stretched in a direction perpendicular to the axial direction of the end mill. Before film formation, the air pressure was adjusted to 1kPa, the flow rate of methane was adjusted to 30SCCM (1atm, 0°C), the flow rate of hydrogen was adjusted to 3000SCCM (1atm, 0°C), and the filament was kept at 1500°C for 2 hours. The filament is carbonized. In addition, the unit "SCCM" of a gas flow rate is a volumetric flow rate (cc / min) converted under st...
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Abstract
The present invention makes it possible to prevent the occurrence of defects due to peeling or chipping, and obtain a smooth machined surface. A diamond coating includes a first diamond layer comprising fine diamond particles and a second diamond layer comprising large diamond particles. In a flank-side diamond coating, the average film thickness d2 is 3-25 [mu]m inclusive, and has the first diamond layer formed on the obverse surface side and the second diamond layer formed on the tool base side. In a rake face-side diamond coating in the range of 50 [mu]m or 1 / 10 of the tool diameter, whichever is smaller, from the tip of a base cutting blade part, the average film thickness d1 is in the range of 0-5.0 [mu]m inclusive or 0 [mu]m to less than d2, whichever is smaller. The boundary betweenthe first diamond layer and the second diamond layer at an edge surface of the flank-side diamond coating is exposed on the base flank side in relation to the extension of a reference line linking the base cutting blade part and the center of rotation of the tool on the perpendicular cross-section of the base cutting blade part.
Description
technical field [0001] The present invention relates to a diamond-coated rotary cutting tool in which diamond is coated on the surface of a substrate comprising cemented carbide. [0002] This application claims priority based on Japanese Patent Application No. 2017-189702 for which it applied on September 29, 2017, and uses the content for this specification. Background technique [0003] A rotary cutting tool in which diamond is coated on the surface of a substrate made of cemented carbide has the advantage of high tip strength, but it is difficult to obtain a smooth machined surface because the tip is rounded according to the film thickness of the diamond coating. question. [0004] For the problem that the cutting edge of the tool is rounded, for example, the methods described in Patent Document 1 to Patent Document 4, etc. have been proposed. [0005] Patent Document 1 describes that the cutting edge is sharpened by forming the diamond coating on the cutting edge flat...
Claims
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IPC IPC(8): B23C5/10B23B27/14B23B27/20B23B51/00C23C16/26C30B29/04
CPCC23C30/005C23C28/04C23C28/044C23C28/046C23C16/271C23C16/279B23B27/20B23B51/00B23C5/10B23C5/1009B23C2226/31
Inventor 久保拓矢村田和久富永哲光
Owner MITSUBISHI MATERIALS CORP