Cermet tool

Details Cermet tool Cermet tool

1999-03-31

2001-08-21

Turner, Archene (Department: 1775)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

C051S295000, C051S307000, C051S309000, C075S238000, C075S244000, C428S469000, C428S472000, C428S698000

Reexamination Certificate

active

06277486

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a cermet tool and a process for producing the same.
BACKGROUND OF THE INVENTION
A cermet sintered body, which comprises a hard phase mainly comprising a carbonitride of Ti and a
4
a
,
5
a
,
6
a
Group element component other than Ti (V, Cr, Zr, Nb, Mo, Hf, Ta and W), the hard phase being bound with a binder metallic phase mainly comprising Ni and/or Co is known. Such bodies have excellent plastic deformation resistance, etc. in comparison to hard alloys which have also been conventionally used. Therefore, the sintered bodies are replacing the super-hard alloys as a main stream cutting tool.
However, the cermet sintered bodies described above generally exhibit an appearance having a near black hue or color. Therefore, when wear proceeds as a tool is used, it is difficult to distinguish between a worn part and a non-worn part with the naked eye. Accordingly, problems may occur in that machining may proceed even when the life of the tool has expired. This may result in damage to the material which is being cut. On the other hand, a tool that can still be used may be replaced due to a misjudgment in the life of the tool by an operator.
An object of the present invention is to provide an improved cermet tool wherein the differences in color or hue between a worn part and non-worn part can be easily seen by the naked eye, so that the time at which the life of the tool is expired can readily be determined.
BRIEF SUMMARY OF THE INVENTION
In essence, a cermet tool according to the present invention comprises a binder metallic phase, a hard phase, and a surface coating. The binder metallic phase comprises Ni, or Ni and Co (hereinafter referred to as a binder metallic phase forming component). The hard phase contains a metallic element component of the phase (hereinafter referred to as a hard phase metallic element component), Ti constituting its main part, and one or more of an additional metallic element component M. The metallic element component M is selected from the group consisting of V, Cr, Zr, Nb, Mo, Hf, Ta and W. The hard phase mainly comprises a carbonitride of the hard phase metallic element component.
The surface coating layer is formed on a surface outermost part of the cermet. The surface coating layer mainly comprises one or more metallic elements selected from Ti, Al, V, Cr, Zr, Nb, Mo, Hf, Ta and W with Ti being necessary as a main component. The surface coating layer includes at least one of a carbide, a nitride and a carbonitride of the metallic element or elements.
This surface coating layer also has an appearance lightness Vs and a saturation Cs in lightness defined in the Japanese Industrial Standard JIS Z8721 satisfying at least one of Vs of 6 or more and Cs of 4 or more. An English language translation of the Japanese Industrial Standard JISZ 8721 has been published and is available from the Japanese Standards Association 1-24 Akasaka 4 Minato-ku, Tokyo 107, Japan.
In a second embodiment of the invention, the surface coating layer has an appearance exhibiting a substantially achromatic color or chromatic color having a hue range of from 5 PB to 5 Y via 5 RP on a hue circle defined in JIS Z8721. The Japanese Industrial Standard JIS Z8721 is a color system wherein color notation and value are defined by number and alphabet and is incorporated in its entirety by reference. The color system corresponds to the Munsell system.
The invention will now be described in connection with the following figures.


REFERENCES:
patent: 3958070 (1976-05-01), Schintlmeister et al.
patent: 4447263 (1984-05-01), Sugizawa et al.
patent: 4556607 (1985-12-01), Sastri
patent: 4902395 (1990-02-01), Yoshimura
patent: 5336292 (1994-08-01), Weinl et al.
patent: 5376466 (1994-12-01), Koyama et al.
patent: 5682590 (1997-10-01), Weinl
patent: 6004371 (1999-12-01), Rolander et al.
patent: 0 492 059 (1992-07-01), None
patent: 9-264813 (1997-10-01), None
JP 5098383A and its English abstract (no date).
JP 53052212A and its English abstract (no date).

Affiliated with

Also associated with

Rating

Cermet tool does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cermet tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cermet tool will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2532879