Empress Catherine II Saint Petersburg Mining University, St. Petersburg, Russia

V. V. Maksarov, Dr. Eng., Prof., Dean of the Faculty of Mechanical Engineering, e-mail: maks78.54@mail.ru
Nguyen Van Dao, Postgraduate Student, Dept. of Mechanical Engineering, e-mail: nguyenvandao091097@gmail.com
A. D. Khalimonenko, Cand. Eng., Associate Prof., Dept. of Mechanical Engineering, e-mail: Khalimonenko_AD@pers.spmi.ru
P. V. Shishkin, Cand. Eng., Associate Prof., Dept. of Transport and Technological Processes and Machines, e-mail: shishkinp@mail.ru

An analysis of methods for crushing chips when processing difficult-to-cut materials was carried out. The process of cutting workpieces from austenitic steels is considered based on preliminary local cryogenic action on the surface being processed with the creation of a strengthened zone with a fine-grained structure. A model for the implementation of local cryogenic effects on the processed surfaces of workpieces has been constructed. The dimensional parameters of the hardened zone with a fine-grained structure have been determined, which helps ensure stable segmentation and crushing of drain chips, as well as achieving high quality of machined surfaces of the workpiece after applying a preliminary cryogenic effect. The influence of cryogenic exposure on the processing of austenitic steels is shown.

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