Surface coating cutting tool and manufacturing method thereof

A surface coating and cutting tool technology, applied in chemical instruments and methods, liquid chemical plating, metal material coating processes, etc., can solve the problems of easy peeling, low crystallinity of titanium carbide layer, layer peeling, etc. Excellent surface smoothness, excellent cutting performance, the effect of improving the bonding force

Active Publication Date: 2015-08-05
MITSUBISHI MATERIALS CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The α-alumina layer disclosed in Patent Document 1 is unsatisfactory in high temperature strength and surface properties. Therefore, when heavy cutting is performed at a higher speed, not only chipping but also thermoplastic deformation and misalignment are prone to occur. For this reason, wear resistance decreases, and there is a problem that the service life is reached in a relatively short period of time.
[0015] In addition, the titanium carbide layer disclosed in the above-mentioned Patent Document 2 has low crystallinity and poor mechanical properties and interface strength, so it is prone to peeling, and there is a problem that wear will rapidly progress even if it is coated with an aluminum oxide layer.
[0016] Furthermore, when the CrN layer disclosed in the above-mentioned Patent Document 3 is used in interrupted heavy cutting, the progress of cracks in the layer cannot be avoided, and there is a problem of peeling and chipping of the layer due to this.
[0017] And, disclosed in the above-mentioned Patent Document 4 having Al 2 o 3 layer and ZrO 2 and / or HfO 2 In a composite material in which a third finely dispersed phase composed of titanium oxide, carbon oxide, nitrogen oxide or carbon oxynitride is introduced into the layer, the heat generated during cutting will cause a knife The subject of sharp plastic deformation

Method used

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  • Surface coating cutting tool and manufacturing method thereof
  • Surface coating cutting tool and manufacturing method thereof
  • Surface coating cutting tool and manufacturing method thereof

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preparation example Construction

[0062] Preparation of alumina sol:

[0063] First, alcohols (e.g., ethanol, 1-butanol) and water are added as solvents, and acids (e.g., hydrochloric acid, nitric acid) are added to aluminum alkoxides (e.g., aluminum sec-butoxide (ASB), aluminum propoxide) As a catalyst, sodium laurate (C 11 h 23 COONa) or sodium dodecylbenzenesulfonate (DBSN) as a surfactant, after stirring in the temperature range below -10 to 20°C, the same temperature range as the stirring, such as stirring and aging treatment The aging treatment is carried out at a temperature range of -10 to 20° C. or lower over a long period of 12 hours or more in total to form an alumina sol. In addition, the alumina sol used in the present invention preferably uses dimethylformamide (DMF) and acetylacetone (AcAc) as a chelating agent. This is for the purpose of suppressing excessively accelerated crystallization. If a chelating agent having an effect of suppressing excessively accelerated crystallization is not use...

Embodiment 1

[0078] Next, the present invention will be described more specifically by way of examples.

[0079] (a1) As raw material powders, fine particle WC powder with an average particle diameter of 0.8 μm, medium-grained WC powder with an average particle diameter of 2 to 3 μm, and TiCN powder, ZrC powder, and TaC powder with an average particle diameter of 1 to 3 μm are prepared. powder, NbC powder, Cr 3 C 2powder, VC powder, and Co powder. These raw material powders were mixed into the specified compounding composition shown in Table 1, and paraffin wax was further added and ball milled in acetone for 24 hours. After drying under reduced pressure, they were stamped and formed into specified shape of the compact, and the compact is vacuum sintered in a vacuum of 5 Pa at a temperature of 1400°C for 1 hour. After sintering, the cutting edge is subjected to R: 0.05mm edge grinding , thereby manufacturing WC-based cemented carbide tool substrates A, B, C, D, E, E1, E2, E3, E4, E5 (ref...

Embodiment 2

[0139] As raw material powders, TiCN (TiC / TiN=50 / 50 by mass ratio) powder, Mo 2 C powder, NbC powder, TaC powder, WC powder, Co powder, and Ni powder were blended into the prescribed compounding composition shown in Table 9, and wet-mixed with a ball mill for 24 hours. After drying, press molding under a pressure of 98MPa To make a compact, the compact was sintered in a nitrogen atmosphere of 1.3kPa at a temperature of 1540°C for 1 hour. After sintering, the cutting edge was subjected to R: 0.07mm edge grinding. Thus, TiCN-based cermet tool bases F, G, H, I, J, J1, J2, J3, J4, J5 (referred to as tool bases F to J5) having insert shapes according to ISO standard CNMG120412 were produced. However, for the tool base J2, in a nitrogen atmosphere of 1.3 kPa, the temperature increase rate was set to 2 °C / min, and after the temperature was raised from room temperature to 1540 °C and kept for 30 minutes, it was set to a vacuum of 13 Pa and kept at 1540 °C for 30 minutes. After 10 min...

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Abstract

The invention provides a surface coating cutting tool and manufacturing method thereof which presents excellent anti-knife-breaking performance in high-speed intermittent cutting processing. According to the surface coating cutting tool of the invention, the surface of a tool substrate, of which the surface is provided with a solidified layer, is provided with an aluminium oxide layer. The aluminium oxide layer is 0.2-5.0[mu]m thick on average and is relatively high in smoothness. The aluminium oxide layer is composed of alpha-type aluminium oxide or mixed alpha-type aluminium oxide and gama -type aluminium oxide. Furthermore, the proportion of titanium contained in the aluminium oxide layer is above 0.02 atoms % and below 10 atoms %. The ratio of the average circumference of grains to the circumference of a circle which is homalographic with the grains constituting the aluminium oxide layer is 1.8-3.0.

Description

technical field [0001] The present invention relates to a hard coating that has excellent lubricity, chipping resistance, and wear resistance, so even when used in high-speed interrupted cutting of steel and cast iron, it can be used for a long time. Surface-coated cutting tools with excellent cutting performance. Background technique [0002] For a long time, it has been known to form carbides, nitrides, carbonitrides, etc. composed of at least one element selected from the IVB, VB, and VIB groups of the periodic table on the surface of the tool substrate composed of cemented carbide. The hard coating is used as a hard coating layer, thereby improving the wear resistance of cutting tools. [0003] Moreover, in the hard film, the α-type alumina layer has excellent thermal stability, low reactivity, and high hardness. The outermost layer of the hard coating layer composed of carbides, nitrides, carbonitrides, etc. of at least one element in the group is formed by coating. ...

Claims

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Application Information

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IPC IPC(8): B32B33/00B32B15/00C23C18/12
Inventor 柿沼宏彰大桥忠一长田晃胁谷尚树铃木久男筱崎和夫
Owner MITSUBISHI MATERIALS CORP
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