Abstract
Investigation of contact phenomena in turning using tools made of low-alloy high-speed steels
Highlights
IntroductionIt is known that physical phenomena occurring in the area of contact between the tool point and the material subjected to machine cutting (i.e. plastic deformation of the material, heat release, friction of clean surfaces, etc.) are defined by the quality of the machined surface, tool durability, and the most effective conditions for machining [1, 2]
It is known that physical phenomena occurring in the area of contact between the tool point and the material subjected to machine cutting are defined by the quality of the machined surface, tool durability, and the most effective conditions for machining [1, 2]
The results of investigations of cutters durability conducted at the same cutting parameters show that at large cut layer thickness durability of the cutter edge made of HS3-1-2 steel amounts to Tc = 15 min and durability of the cutter edge made of HS6-5-2 steel, to Tc = 300 min
Summary
It is known that physical phenomena occurring in the area of contact between the tool point and the material subjected to machine cutting (i.e. plastic deformation of the material, heat release, friction of clean surfaces, etc.) are defined by the quality of the machined surface, tool durability, and the most effective conditions for machining [1, 2]. To enable rational use of the tool it is necessary to identify phenomena in the contact area, most importantly such factors as normal and shear stress as well as thermal phenomena linked with the parameters of cutting, and blade material and geometry. Regardless of the differences in the values and trends of the normal and shear stresses at the contact interfaces, minimum tool wear occurs and apparent friction coefficient reaches its lowest value at the optimum cutting speed [3, 4]. Friction and temperature at the point of contact between the tool blade and the machined material to a degree will have an impact upon the conditions of built-up accumulation and its dimensions, and as a consequence will affect wear and tear of the tool and the roughness of the machined surface
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