Technological Principles of Increasing Wear Resistance of Parts by Electromechanical Surface Hardening

The durability of a wide range of machine parts largely depends not on the metal quality throughout the cross-section of the part but on the structural condition and physical and mechanical properties of the surface layer. It is the surface layer that determines operational properties of the parts such as wear resistance, strength, material resistance to fatigue failure, contact fatigue, corrosion resistance and other properties. At present, the existing methods of increasing surface wear resistance by only volumetric heat treatment have been nearly exhausted. To increase durability, leading manufacturers in Russia and abroad use surface plastic deformation, chemical and thermal treatment, finish anti-friction abrasive treatment, finish plasma hardening, non-abrasive ultrasonic finishing, laser and plasma hardening, and electric spark alloying to improve the surface layer quality. The most effective way to reduce the cost of manufacturing and improve the machine quality is the technology of surface treatment by concentrated energy flows. These surface treatment methods have a number of features that favorably distinguish them from other heat treatment options. One of such methods is electromechanical surface hardening of steel parts. Using this technology, it is possible to improve wear resistance of tool joints and ensure safety of the casing through the tool joint surface hardening.

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