Home / Application Examples - CBN Machining Hardened Steel
| Component: | Special Bearing | |
| Machine Tool: | Traub CNC Lathe | |
| Material: | EN41 (100Cr6) (AISI 52100) through hardened to 58-60 HRc | |
| Operation: | Boring (Form) | |
| Depth of Cut: | 0.5mm (0.015”) | |
| Insert: | DNMA 150606T DE DR-50 | |
| Surface Speed: | 140 m/min (465 ft/min) cutting with coolant | |
| Feed Rate: | 0.1 mm/rev (0.004”/rev) | |
| Surface Finish: | Must be better than 0.8 Ra (32 Cla) | |
| Tool Life: | Average 40 minutes contact | |
| Comments: | Previously Form Grinding on a CNC single point tool | |
| Component: | Gear | |
| Machine Tool: | Harison 400 Manual Lathe | |
| Material: | EN36B (14NRCR14) (AISI 3415) Case hardened to 58-60 HRc | |
| Operation: | Boring and Facing (interrupted) | |
| Depth of Cut: | 0.5 mm (0.020”) Roughing – 0.05 mm (0.002”) Finishing | |
| Insert: | CNMA 120408T DE DR-50 (CNMA 432) | |
| Surface Speed: | 150 m/min (500 ft/min) boring wet – facing dry | |
| Feed Rate: | 0.2 mm/rev (0.008”/rev) | |
| Surface Finish: | Not important | |
| Tool Life: | Average 40 minutes contact boring and 30 minutes facing | |
| Component: | Gas Turbine Engine Bearing Cage | |
| Machine Tool: | Newall Jig Borer | |
| Material: | Nitrided Steel 64 HRc | |
| Operation: | Boring | |
| Depth of Cut: | 0.1 mm per pass | |
| Insert: | TNMA 110304T DE DR-50 | |
| Surface Speed: | 100 m/min (330 ft/min) cutting without coolant | |
| Feed Rate: | 0.05 mm/rev (0.002”/rev) | |
| Surface Finish: | Must be better than 0.8 Ra (32 Cla) | |
| Tool Life: | 2 parts | |
| Comments: | It takes longer to load the part than machine it, as opposed to 1 | |
| Days grinding and there is no danger of surface abuse. | ||
| Component: | Cam Rotor | |
| Machine Tool: | Cincinnati Sabre Vertical machining center | |
| Material: | EN36B (14NiCR14) (AISI 3415) Case hardened to 58-62 HRc | |
| Operation: | Fly cutting (milling) | |
| Depth of Cut: | 0.175 mm (0.007”) | |
| Insert: | TNMN 160308T DE DR-50 | |
| Surface Speed: | 160 m/min (530 ft/min) cutting without coolant | |
| Feed Rate: | 0.05 mm/rev (0.002″/rev) | |
| Surface Finish: | 7 micron Rt achieved over batch of 130 parts | |
| Tool Life: | Entire batch of components with 2 sides of 1 insert | |
| Comments: | 1 day machining versus 1 week grinding | |
