| 1 MINUTE READ

Improving Hard Turning

While it is pointed out that using hard turning in place of grinding for case-hardened or induction-hardened steel components such as transmission shafts and gears can reduce both machining costs and time by as much as 70 percent or more, according to the people at Sandvik Coromant Co. (sandvik.coromant.com) such gains are achievable only if that hard turning (usually performed as a finishing or semi-finishing process) is performed with optimized insert grades.

While it is pointed out that using hard turning in place of grinding for case-hardened or induction-hardened steel components such as transmission shafts and gears can reduce both machining costs and time by as much as 70 percent or more, according to the people at Sandvik Coromant Co. (sandvik.coromant.com) such gains are achievable only if that hard turning (usually performed as a finishing or semi-finishing process) is performed with optimized insert grades. So the company has developed two new grades to address hard turning applications, CB7105 and CB7115, which use a PCBN grade material and coating (as well as specific edge prep).

CB7105 is said to provide better crater wear resistance and CB7115 better fracture resistance.

In a trial of the new insert materials, the production of case-hardened 16MnCrS5 (HRc 57-62) automotive components was increased by at least 15 percent after switching to CB7105 and CB7115. CB7115 surpassed 600 components (at 0.15 minutes time-in-cut) with predictable surface generation and lower Rz value. The cutting speed was 170 m/min (557 ft/min), while feed rate was 0.22 mm/rev (0.008 inch/rev) with a cutting depth of 0.15 mm (0.006 inch).

RELATED CONTENT

  • 2017 Hyundai Ioniq Hybrid Blue

    A young(ish) guy that I’ve known for a number of years, a man who spent the better part of his career writing for auto buff books and who is a car racer on the side, mentioned to me that his wife has a used Lexus ES Hybrid.

  • Chip Foose: Humble Genius

    Scene 1After speaking at Detroit's Cobo Hall during the North American International Auto Show, Chip Foose seems genuinely taken with the evident adulation of the audience, and takes the time to answer every question and sign autographs.The second oldest child and only male in a family with four kids, Chip Foose was born in Santa Barbara, California, on October 6, 1963.

  • Multiple Choices for Light, High-Performance Chassis

    How carbon fiber is utilized is as different as the vehicles on which it is used. From full carbon tubs to partial panels to welded steel tube sandwich structures, the only limitation is imagination.