Coated cutting tool

Details Coated cutting tool Coated cutting tool

2011-07-26

2011-07-26

Turner, Archene (Department: 1784)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

C051S307000, C051S309000, C428S216000, C428S472000, C428S697000, C428S698000, C428S699000, C428S701000, C428S702000

Reexamination Certificate

active

07985471

ABSTRACT:
The present invention concerns a cutting tool insert for turning of steel at high cutting speeds. The cutting tool insert comprises a (006) textured α-Al2O3coated cemented carbide grade. The cemented carbide body has about 4.5-6.5 wt-% Co and about 3-10 wt-% cubic carbide forming metals and an S-value of about 0.77-0.92 and a coercivity of about 10-20 kA/m. The α-Al2O3layer has a thickness ranging from about 7 to 12 μm and is composed of columnar grains having a length/width ratio from about 2 to 12 and is deposited on an MTCVD Ti(C,N) layer having a thickness from about 4 to 12 μm. The alumina layer is characterized by a pronounced (006) growth texture. The alumina layer is the uppermost layer and is wet-blasted having an Ravalue of less than 1 μm, giving the tool a black and shiny appearance.

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Osada et al., “Wear Mechanism of Thermally Transformed CVD Al203 Layer”, International Journal of Refractory Metals and Hard Materials, Sep. 2006, p. 387-391, vol. 24, No. 5, XP005445838.
EP Search Report dated Sep. 30, 2008 from EP08159473.

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