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cutting tool

A cutting tool, lower layer technology, used in cutting inserts, manufacturing tools, workpieces, etc., can solve the problems of coating impact, coating edge curling, peeling, etc.

Active Publication Date: 2019-12-24
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In heavy interrupted cutting, it is easy to apply a large impact to the cutting edge
Under such severe cutting conditions as above, a large impact is applied to the coating, and the coating is prone to curling and peeling.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0075] First, a mixed powder containing 6% by mass of cobalt metal powder with an average particle size of 1.2 μm, 0.5% by mass of titanium carbide (TiC) powder with an average particle size of 2 μm, and 5% by mass of carbide powder with an average particle size of 2 μm Niobium (NbC) powder, and the rest are tungsten carbide powder with an average particle size of 1.5 μm. A molded body in which the above-mentioned mixed powder was molded into a tool shape (CNMG120408) was produced by press molding. After the molded body was subjected to binder removal treatment, it was fired at 1500° C. under a vacuum of 0.01 Pa for 1 hour to produce a substrate. After that, brushing is performed on the produced base body, and fillet honing is performed on the part of the tool that will be the cutting edge.

[0076] Next, a coating was formed on the above-mentioned substrate by the chemical vapor deposition method under the film-forming conditions shown in Table 1, thereby producing a cutting...

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Abstract

A cutting tool according to one aspect includes a base, and a coating on the surface of the base, and the coating includes a lower layer, an upper layer, and an intermediate layer between the lower layer and the upper layer. The intermediate layer has: a first layer, which contains TiC x1 N y1 o z1 , where, 0≤x1<1, 0≤y1<1, x1+y1+z1=1; the second layer, which contains TiC x2 N y2 o z2 , wherein, 0≤x2<1, 0≤y2<1, 0<z2<1, x2+y2+z2=1; and a third layer, which is located between the first layer and the second layer, and contains TiC x3 N y3 o z3 , where 0≤x3<1, 0≤y3<1, 0≤z3<1, x3+y3+z3=1, z1>z3, and z2>z3.

Description

technical field [0001] The invention relates to cutting tools having a coating on the surface of a substrate. Background technique [0002] Known cutting tools include a substrate such as cemented carbide, cermet, or ceramics, and a coating on the surface of the substrate. Such cutting tools are generally referred to as coated tools. As coatings, for example titanium carbonitride (TiCN) layers and aluminum oxide (A1 2 o 3 )layer. [0003] With the recent improvement in the efficiency of cutting processes, opportunities to use cutting tools under severe cutting conditions such as heavy interrupted cutting have increased. In heavy interrupted cutting, it is easy to apply a large impact to the cutting edge. Under such severe cutting conditions as described above, a large impact is applied to the coating, and chipping and peeling of the coating tend to occur. Therefore, in addition to abrasion resistance, improvement of chipping resistance is required for a coating. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B27/14C23C16/36C23C16/40B22F1/05
CPCC23C16/36C23C16/40B22F1/05C23C16/403C23C28/042C23C28/044B23B2228/10B23C2228/10B22F3/1021B22F2301/15B22F2302/10B23B27/148B23B27/1603B23B2200/0471C22C29/067C22C29/10
Inventor 儿玉芳和久保隼人胜间忠渡边贤作熊井健二
Owner KYOCERA CORP