This paper describes some fundamental principles, specific features, and the technological capabilities of a new method of quenching steel surface by turning without separation of chips. The underlying process of this method is a deformational cutting (DC), which is based on the undercutting and deformation of surface layers that remain attached to the workpiece. The energy released in the area of DC is used to heat the undercut layer up to the temperatures of structural and phase transformation of workpiece material. This type of process results into a hardened structure formed at the surface which consists of inclined thin undercut layers tightly packed and stuck together and form a single solid body. The resulting hardened structures achieved in steels workpieces are presented in the paper. The samples hardened by DC showed a higher wear resistance compared to samples with traditional quenching. This paper also describes an estimation of the thermo-physical parameters of the DC process.
The heating, generated in the process of deformational cutting without chip separation used for phase transformation in steel during lathe machining. Chips are not separated from the workpiece and remain on the surface thus forming a special reinforced structure. The result of processing is a steel surface quenching up to 1 mm deep. The proposed method also makes it possible to obtain hardened surface structures with alternating inclined layers of different hardness. The article presents calculations of heating and cooling rates, types of hardened structures, hardness investigation of hardened steel surfaces.
Введение. Для широкой номенклатуры деталей машин, работа-ющих в условиях интенсивного изнашивания, проблема повышения износостойкости может быть решена использованием технологий по-верхностного упрочнения.Среди известных технологий поверхностного упрочнения сталь-ных деталей трения традиционными являются закалка токами высо-кой частоты, химико-термическая обработка, поверхностное пласти-ческое деформирование. В последнее время большое внимание уде-ляется методам обработки концентрированными потоками энергии, поскольку при высокоскоростных температурных и силовых воздей-ствиях формируются особые структуры с повышенными эксплуата-ционными характеристиками [1]. Критерием выбора рациональной технологии поверхностного упрочнения является компромисс между обеспечением высоких эксплуатационных свойств и стоимостью реа-лизации технологии.
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