Modern Machine Shop

DEC 2018

Modern Machine Shop is focused on all aspects of metalworking technology - Providing the new product technologies; process solutions; supplier listings; business management; networking; and event information that companies need to be competitive.

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Page 93 of 115

TOOLING AND WORKHOLDING MMS DECEMBER 2018 92 Helical Cutter Delivers High Metal Removal Rates, Low Cutting Forces Kennametal's Harvi Ultra 8X helical milling cutter was designed to meet high metal removal needs in aerospace machining as well as to provide machinists with a tool that can withstand higher cutting speeds but generate lower machining forces. According to the company, the Harvi Ultra 8X can predictably remove 20 cubic inches (328 cm 3 ) of Ti-6Al-4V per min. while attaining 60 min. of tool life per cutting edge. Several design features enable the cutter to accomplish this. A double-sided yet positive-rake insert reduces cost per edge and simultaneously reduces power consumption by up to 50 percent. The AlTiN+TiN PVD coating provides robust resistance to thermal fatigue, while Kennametal's high-perfor- mance KCSM40 carbide grade provides longer tool life. The cutter body is constructed of a higher-quality steel for improved stiffness and rigidity under high cutting forces. A BTF46 (bolt taper flange) connec- tion provides high deflection resistance compared to traditional shell-mill-type holders. The variable helix design breaks up the harmonics that lead to chatter, further improving tool life, part quality and throughput. Using 12- and 10-mm inserts also reduces vibration, as their smaller size means more inserts in the cutter body, more inserts engaged in the workpiece and more inserts to absorb the pounding of a heavy machining operation. Precision through-tool coolant nozzles direct cut- ting fluid where it is needed most. An enhanced flute design promotes chip evacuation. Oversize M4 Torx Plus screws provide greater insert stability. The option of a KM4X adapter brings greater toolholding stabil- ity. Specially prepared insert edges optimized for the KCSM40 grade are said to extend tool life. Corner radii from 0.8 to 6.4 mm are said to expand the number of possible cuts. | Kennametal Inc. | 800-446-7738 |

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