Общий каталог Widia 2017 - страница 596

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Separator™ Technical Recommendations • Separator Cut-Off System (continued) Eliminate built-up edge: Eliminate chatter: • Select proper grade for insert. • Minimise tool blade and holder overhang. • Increase speed (RPM). • Minimise part overhang. • Increase the feed rate. • Use strongest toolholder system. • Use ample amounts of well-directed coolant • Use a more narrow width of insert. (see Figure A on page E131). • Chipbreaker might be too aggressive. (Call Technical Support.) • Adjust speed and feed rate up or down. • Hold workpiece rigidly. • With a longer part, support with steady rest or live centre. • Avoid machine dwell. • Use S2 or X2 to reduce cutting forces. Chamfer and cut-off operations: • Use Separator S2 or X2. • Groove or breakdown workpiece surface being machined. • Machine the chamfer. • For jobs requiring a chamfer on both ends of the part, begin by plunging to a depth just beyond the depth of the chamfers. Then, return to the part O.D. and profile each chamfer individually. Finish the cut-off after completion of the second chamfer. • Cut off the workpiece (see Figure C). Reduce cut-off nib on solid bar or I.D. bur on tubing: • Check tool height. Insert cutting edge should be on centre to 0,05mm above centreline of workpiece. • To reduce nib on part, use a high lead angle-type insert. Lead angle on a cut-off insert reduces the nib, which remains on the workpiece. CAUTION: the higher the lead, the more tool-side deflection. Figure C • Use the narrowest possible cut-off insert to minimise the cut-off bur length. • Reduce feed rate at the end of a cut. • On most tubing-type parts, a 4° or 5° lead angle will be sufficient. • Add support to a long slender-type part. • Maintain proper sub-spindle alignment. • If nib or bur persists, call Technical Support about reducing hone size. • Use small- or no-corner radius. E132 widia.com