Experimental Investigation of Grinding of External Cylindrical Surfaces of Parts by Inclined Thin Abrasive Wheels

: pp. 76 - 87
Lviv Politechnic National University
Lviv Politechnic National University
Lviv Polytechnic National University

Aim. Experimental investigation of grinding of external cylindrical surfaces of parts by thin abrasive wheels that are inclined to working surface. Methods. The investigation was carried out using the methods of cutting theory, the planning of experiments, statistical processing of experimental results. Results. The thin reinforced abrasive wheels (heightened circular speed gives for these wheels) are proposed to use to work up outer cylindrical surfaces of parts with covering heightened wear resistance and hardness or the details that were received of hard-to-machine materials. The influence of the cutting modes in the production process by thin abrasive wheels on the amount of effective power and the main component of the cutting force during the processing of external cylindrical surfaces of parts were experimentally determined. The empirical relations between production modes and power parameters of the production process were  defined for oncoming directions and passing directions of circular speed for the machined cylindrical part and thin abrasive wheel. Scientific novelty. The ratio of production mode by thin inclined abrasive wheels on the effective cutter power and the main component of the cutting force during the processing of external cylindrical surfaces of parts, which were experimentally received, determines that accompanying processing by the increase of cutting depth and circular speed of rotation is accompanied to increase of effective cutter power and the main component of cutting force, and the increase of the longitudinal feed is accompanied to reduce them, but effective cutter power and the main component of cutting force increase during the growth of a feed and circular speed of the part for counter processing, however, these values reduce during the increase of cutting depth. The compatible, paired influence of several factors of processing modes on the power parameters of the process is important during the production process by the inclined thin abrasive wheel. The production process concerns processes with low energy consumption. The effective cutting power does not exceed 0.45 kW for all combinations of cutting modes. Low effective cutting power together with a small contact area of the abrasive wheel with the workpiece determine a small effect on the treated surface of the heating temperature in the processing area that ensures the preservation of the mechanical characteristics of the surface layer, which was obtained in the previous stages of manufacturing the part. Low energy consumption of the production process of cylindrical parts by inclined thin abrasive wheels determines the availability of its practical use. Practical significance. The production process of cylindrical workpiece surface of hard-to-process materials or with thick-layer wear-resistant coatings, which have significant previous surface irregularities, by inclined thin abrasive wheels was proposed to use on operations of rough round grinding or on rough transitions of turning operation. The studied machining process can be implemented on lathes that are equipped with the additional, replaceable high-speed electric drive of rotation of a thin abrasive wheel. The use of the method of processing the outer cylindrical surfaces by thin abrasive wheels provides: the use of low cost cutting tools, reduction of the main processing time due to the greater depths of cutting, increase productivity and reduce the cost of processing and versatility of the process, due to the ability to process the cylindrical surfaces of parts that are formed from a variety of materials with significantly different physical and mechanical properties.

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