A steel roughing grade coated cemented carbide cutting tool comprises WC grains equal to or less than 70 w/o of the tool substrate, from about 5 to about 10 w/o of a cobalt bonding phase and the remainder being metal carbide grains selected from the group TiC, TaC, NbC, HfC and combinations thereof. The average WC grain size is from about 0.9 to about 1.3 microns and less than 10% of the WC grains have a size less than 0.5 microns. The coated cemented carbide tool is coated with an adherent refractory coating layer. The coated cemented carbide cutting tool for the steel roughing applications can be  machining steel at rough and heavy rough cutting conditions.

The new and improved coated cemented carbide cutting tool as previously described comprises the following steps:a steel work piece on a lathe is turned at an effective speed of up to about 275 surface feet per minute for rough cutting and up to about 130 surface feet per minute for heavy rough cutting. The new and improved coated cemented carbide cutting tool is moved across the surface of said steel work piece at a feed rate from about 0.01 to about 0.04 inches per revolution for rough cutting and from about 0.050 to about 0.080 inches per inches per revolution for heavy rough cutting. The steel workpiece is cut with the new and improved coated cemented carbide cutting tool to effect a depth of cut of about 0.125 to about 0.500 inches for rough cutting and about 0.150 to about 0.500 inches for heavy rough cutting.

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The results demonstrate that the conventional cemented carbide cutting tools in accordance with the carbide cutting tool powdered Cr3 C2 or WO3 have superior chipping resistance under high-cutting depth conditions of an end mill used in an intermittent cutting mode due to the presence of ultra-fine particles composed of a Co-based alloy having a particle diameter of 100 nm or less dispersed in a dispersing phase and due to a finer and more homogeneous distribution of the binding phase which is evaluated by a relatively low thermal conductivity. In contrast, the conventional cemented carbide cutting tools have relatively short service lives due to low chipping resistance, although the hardness, the Co and Cr contents, the rate of the dispersing phase, and the average particle diameter are substantially the same as those in the cemented carbide cutting tools of the present invention.

As described above, the cemented carbide cutting tool powdered Cr3 C2 or WO3 has high chipping resistance and has superior cutting characteristics without chipping of the cutting edge for long periods under intermittent heavy cutting conditions such as at a high feed rate or a high cutting depth, in addition to continuous cutting conditions. Thus, the tool satisfactorily contributes to labor and energy saving in cutting operations.

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A cemented carbide cutting tool made of a tungsten carbide-based alloy having high chipping resistance comprising:

8 to 13 percent by weight of Co and 0.1 to 3 percent by weight of Cr as constituents for forming a binding phase, the balance being tungstencarbide as a constituent for forming a dispersing phase and incidental impurities, the rate of the dispersing phase to the total of the dispersing phase and the binding phase being in a range of 72 to 90 percent by area and the average particle diameter being 1 μm or less according to measurement of an electron microscopic texture; wherein the dispersing phase of the cemented carbide cutting tool made of a tungsten carbide-based alloy comprises a dispersing phase composed of ultra-fine particles dispersed in a matrix and having a particle diameter of 100 nm or less, and the ultra-fine particles comprise a Co based alloy.

The Co content is limited to 8 to 13 percent by weight in the cemented carbide alloy constituting the cemented carbide cutting tool of the present invention, because sufficient toughness is not achieved at a content of less than 8 percent by weight whereas abrasion resistance steeply decreases at a content of higher than 13 percent by weight.


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A cemented carbide cutting tool made of a tungsten carbide-based alloy comprising:

A dispersing phase comprising tungsten carbide having an average particle diameter of 1 μm or less,a binding phase comprising Co and Cr,and ultra-fine particles comprising a Co alloy having a particle diameter of 100 nm or less,wherein the dispersing phase is 72 to 90 percent by area of a cross section of the cemented carbide cutting tool; the ultra-fine particles are dispersed inside the tungsten carbide; and the cemented carbide cutting tool contains 8 to 13 percent by weight of Co, 0.1 to 3 percent by weight of Cr, the balance being tungsten carbide and incidental impurities.

And more specifically, relates to a cemented carbide cutting tool having a sharp cutting edge and maintaining high cutting characteristics for long service life when used as an end mill having an intermittent cutting mode and when cutting is performed under heavy cutting conditions such as at high feed rate and high cutting depth.


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