Цельные твердосплавные сверла линейки KenDrill HPR Kennametal 2025 - страница 20

APPLICATION RULES 1) Pilot Drill Hole — IMPORTANT! • The point angle of the pilot drill must be greater Recommendations: than the one of following deep-hole drill to protect its cutting corners. • Use a conical (B976_) or split-point drill to pilot • The diameter size of the pilot drill must be greater than (do not use a HP, TX, GOdrill or any competitive drill). ™ the one of the deep-hole drill to enable easy fit and protect • Check the pilot drill for wear, which can lead to premature margin lands. The required difference in diameter is wear on the B27_ cutting edge and possibly covered by design with the different position of tolerance. catastrophic failure. • Drill Ø = nominal Ø up to nominal +.0004" (+0,010mm). • B976_ and B977_KC7315 drills with a 140° point angle • Depth of pilot hole: minimum 2 x D. are recommended. B978_ is not recommended as the • Deeper pilot holes are preferable. point angle is 135°. • B70_ Flat Bottom Drill with a point angle of 180° is the alternate choice, especially on inclined entries, such as on crankshafts. 2) Feed B27_ into Pilot Hole • Max 500 RPM and recommended feed rate; Recommendations: no rapid traverse. • Run counter-clockwise, especially in horizontal applications • Reduce cutting speed to minimize imbalances in machine to protect the cutting edge, when entering the pilot hole. spindle/adapter! • Depth: .039" (1mm) above the bottom of pilot hole. 3) Drill Hole Cutting Parameters: Start recommended speed and feed rate Recommendations: at .039" (1mm) from the bottom of the pilot hole, clockwise. • DO NOT PECK OR DWELL up to 30 x D! • With long-chipping steel materials, it may be necessary to increase feed rate by 10–20% to provide optimal chip control. • For long-chipping aluminum materials, it may be necessary to decrease feed rate and increase speed. • Reduce feed rate on angled exits and crossholes by 50–60%. HP feed recommendations are usually higher than with competitive SC drills! 4) Drill Retraction Cutting Parameters: 50–500 RPM and feed rate 2–6 m/min. Recommendations: To achieve the best tool performance, we recommend using the deep-hole drill with a hydraulic chuck. Reduce cutting speed to minimize imbalances in machine spindle/adapter! 5) Vertical Applications • If the pilot holes are close to each other, chips can fall into the neighboring hole. • Do not enter a pilot hole that might contain chips with a deep hole drill to avoid chip jamming, wear, or breakage. • If required holes are close to each other, use smart drilling strategies, make sure the pilot holes are getting properly cleaned, or switch to horizontal drilling. Horizontal drilling process preferred for optimum chip evacuation 20