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Cutting tool

A cutting tool and average technology, which is applied in the direction of manufacturing tools, turning equipment, metal processing equipment, etc., can solve the problems of cracking of the coating layer and insufficient adhesion of the coating layer, and achieve improved wear resistance and defect resistance. The effect of high force and high damage resistance

Active Publication Date: 2014-01-08
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the repeated stacking of TiCN (TiN) layers and Al 2 o 3 The composition of the coating layer of the layer, or the crystal form of the TiN layer formed directly on the substrate including the silicon nitride sintered body as in Patent Document 2, even if granular crystals and columnar crystals are mixed in the part adjacent to the substrate In the formed structure, the adhesiveness of the coating layer may be insufficient, and A1 2 o 3 Cracks in the layer and cracks in the covering layer

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0045] As a starting material, lanthanum hydroxide (La(OH) 2 ) powder is 1.76% by mass, alumina (A1 2 o 3 ) powder is 0.4% by mass, magnesium hydroxide (Mg(OH) 2 ) powder is 0.72% by mass, and the balance is silicon nitride (Si 3 N 4 ) powder ratio, added binder and solvent, pulverized with a grinder, and mixed for 72 hours. Afterwards, drying was performed to remove the solvent to prepare a granulated powder, which was press-molded at a pressure of 98 MPa into a cutting tool shape of SNGN120412.

[0046] After degreasing, when the molded body is placed in the firing pot, the Si 3 N 4 The mixed powder of powder, Si powder and Mg(OH)2 powder is used as a mat powder, and the molded body is placed in a state filled with the surrounding of the molded body and covered, and placed in the state of putting it in a carbon cylinder in the firing furnace. Then, the inside of the firing furnace was switched to nitrogen at 101 kPa (1 atmosphere), and the temperature was raised to 1...

Embodiment 2

[0069] In the sample No. 1 of Example 1, the film-forming conditions of the TiN layer of the first layer were changed in the manner shown in Table 3. In addition, the substrate and the layers after the second layer were changed in the same manner as Under the same conditions as in Example 1, a coating layer was formed on the surface of the substrate including the silicon nitride sintered body.

[0070] In the vicinity of the interface between the substrate and the coating layer of the obtained sample, an accelerating voltage of 15 kV and an irradiation current of 2×10 -7 The conditions of A were analyzed by EPMA to confirm the distribution state of La, Mg and Si. Tables 3 to 5 show distribution states of the interface region, intermediate region, and inner region of the substrate. In the tables, the ratios are described based on the content of the inside of the substrate or each coating layer. In addition, other characteristics were evaluated in the same manner as in Example...

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Abstract

[Problem] To provide a cutting tool wherein a covering layer has excellent adhesion and chipping-resistant characteristics. [Solution] A cutting tool (1) is provided with: a base body (2), which is composed of a silicon nitride sintered material; and a covering layer (3), wherein a first layer (4), which is composed of TiN having an average crystal width of 0.1-0.4 µm, a second layer (5), which is composed of an Al2O3 layer having an average crystal width of 0.01-1.5 µm, a third layer (6), which is composed of TiN having an average crystal width of 0.01-0.1 µm, which is smaller than the average crystal width of the first layer (4), and a fourth layer (7), which is composed of an Al2O3 layer having an average crystal width of 0.01-1.5 µm, are laminated in this order on the base body (2) surface from the base body (2) side.

Description

technical field [0001] The present invention relates to a cutting tool, and in particular, to a cutting tool having a coating layer excellent in fracture resistance. Background technique [0002] Cutting tools that are widely used for cutting metals and printed circuit boards, etc., are known in which a single-layer or multi-layer coating layer is formed on the surface of a substrate such as cemented carbide, cermet, and ceramics. As the coating layer, TiC (titanium carbide) layer, TiN (titanium nitride) layer, TiCN (titanium carbonitride) layer and Al 2 o 3 (aluminum oxide) layer and other chemical vapor deposition (CVD) films. [0003] For example, a cutting tool is disclosed in Patent Document 1, which is coated with a TiCN layer, Al 2 o 3 layer, TiCN layer. [0004] In addition, the structure described in Patent Document 2 is that a hard coating layer is coated on the surface of a silicon nitride substrate, and the first layer of the hard coating layer is made of co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/14
CPCC04B2235/5445C04B2235/3206C23C16/403C04B41/009C23C28/044C04B2235/3217C04B2111/0025C04B2235/428C23C28/042C23C16/34C04B2235/3227C04B2235/6562C04B35/587C23C28/42C04B35/62695C04B35/6455C04B2235/661C04B2235/5436C04B41/52C04B41/89C23C16/32C23C16/36Y10T428/24942Y10T428/24975C04B35/584C04B41/4531C04B41/5068C04B41/5031C04B41/526C04B41/5061B23B27/14
Inventor 渡边孝
Owner KYOCERA CORP