INTRODUCTION OF THREE-STAGE THERMAL HARDENING TECHNOLOGY FOR LARGE DIAMETER GRINDING BALLS

摘要

Results are presented for experiments of development and assimilation of three-stage thermal hardening technology for rolled grinding balls 100 and 120 mm in diameter made from low-alloy steel grade (K76F, 75G2S) with the aim of increasing their hardness to the level of the 3rd group of DSTU 3499. Ball thermal hardening regime parameters, the hardness level achieved, and operating life are described.