Finishing Steel Faster: Cermet vs Carbide, Uncoated vs Coated

Published Date
October 31,2019 - 01:30:pm

Related Glossary Terms

  • cermets

    cermets

    Cutting tool materials based mostly on titanium carbonitride with nickel and/or cobalt binder. Cermets are characterized by high wear resistance due to their chemical and thermal stability. Cermets are able to hold a sharp edge at high cutting speeds and temperatures, which results in exceptional surface finish when machining most types of steels.

  • cutting speed

    cutting speed

    Tangential velocity on the surface of the tool or workpiece at the cutting interface. The formula for cutting speed (sfm) is tool diameter 5 0.26 5 spindle speed (rpm). The formula for feed per tooth (fpt) is table feed (ipm)/number of flutes/spindle speed (rpm). The formula for spindle speed (rpm) is cutting speed (sfm) 5 3.82/tool diameter. The formula for table feed (ipm) is feed per tooth (ftp) 5 number of tool flutes 5 spindle speed (rpm).

  • depth of cut

    depth of cut

    Distance between the bottom of the cut and the uncut surface of the workpiece, measured in a direction at right angles to the machined surface of the workpiece.

  • feed

    feed

    Rate of change of position of the tool as a whole, relative to the workpiece while cutting.

  • wear resistance

    wear resistance

    Ability of the tool to withstand stresses that cause it to wear during cutting; an attribute linked to alloy composition, base material, thermal conditions, type of tooling and operation and other variables.

Shorter cycle times are key for manufacturers to remain competitive and profitable.  For roughing applications customers can try running higher cutting speeds, taking heavier depths of cut or using higher feedrates to maximize the metal removal rate and shorten cycle times.  However, in finishing applications the depth of cut is usually fixed (1 finish pass) so only the cutting speed or feed can be addressed.  The purpose of this evaluation was to see how CVD-coated cermets compared to PVD-coated and uncoated cermets and CVD-coated carbide when finishing 1045 steel. Kyocera’s latest CCX CVD-coated cermet grade maintained great wear resistance and was able to run at higher cutting speeds to drastically decrease cycle time.

For more information visit us at http://www.kyoceraprecisiontools.com/ccx/