404 Каталог SUMITOMO 2015 Режущий инструмент и инструментальная оснастка Стр.400

Каталог SUMITOMO 2015 Инструмент и оснастка Стр. 400 0404 ENG Lab2u

Technical Data Drill Guidance Drill Troubleshooting Guide TROUBLE A Drill Wear B Drill Chipping C Cracking D Body Damage by Chips counter measure A1 A2 A3 A4 B C D E F1 F2 G1 G2 G3 Counter Measure Larger clearance angle near drill center. The protruding length of drill should be shortened as much as possible without constricting chip flow. Increase clearance angle at the outer cutting edge The interval between regrinding of drills should be shortened. Larger back taper and narrower width of radial land (Fig. 1). Lip height distance and run out of center cutting edges should be within .0008" .001". Edge treatment should be larger Clearance angle should be reduced Expand the flute width (Fig. 2). Flute length should be maintained (target length is 1.5 L/D) Point angle should be increased (Fig. 3). The helical angle should be reduced (when it is used in horizontal machine). The diameter of body should be smaller (using in horizontal machine, A type drill) (Fig. 4). Edge treatment should be smaller The feed rate should be decreased Cutting speed should be decreased The feed rate should be increased (Fig. 1) i f Bigger back taper Narrower width of radial lands 150° (Fig. 4) Outside dia. of body should be .020" .040" smaller than the drill dia 400