Specific Features of Thermal Processes in Double-Sided Face Grinding Machines

Abstract

The paper presents an analysis of thermal processes in the bearing system of a double-sided face grinding machine. Experimental data on temperatures and displacements obtained when the machine is idling and when imitating the grinding process with the help of electric heaters of various powers are used for analysis. The performed studies have shown that thermal deformations of double-sided face grinding machines with an arc trajectory of workpiece feed occur in a wide range in magnitude and direction. It can violate the main requirement for the precise operation of the machine - the symmetry of processing conditions at both ends of the workpiece. From the experiments, the absolute value of the non-parallelism of the grinding wheels after three hours of operation is established; it is almost twice the value of the removed allowance. Analysis of the kinetic change in the deformations of the supporting system of the machine tool during operation under thermal load shows that as it warms up, the relative position of the grinding wheels gradually changes from the state "wider at the bottom" to the state "narrower below". This leads to a spontaneous change in the dynamic tuning of the technological system and a corresponding change in the processing accuracy. Changes in the dynamic tuning of the technological system with varying intensity continue throughout the entire operating time of the machine.

The Prospects of Abrasive Treatment of Tough-To-Machine Materials

“…As practical experience shows, application of rational compositions of cooling-lubricant technological fluids (CLTF), advanced methods and devices for their supply to the cutting zone are intrinsic and necessary element of technological support for operations of abrasive machining, providing many advantages. These advantages include optimal increase in work capacity of facer, decrease in heat density of the process, improvement of grinded surface quality and cutting modes (Patent 1997;Ivanova et al, 2018;Dement'ev et al, 2017;Ivanova 2016;Rezchikov et al, 2017;Nikitina & Polyakov, 2021;Troshin & Zakharov, 2020;Tambiev, 2018;Nikiforov & Maltsev 2014). Moreover, designing a tool for abrasive machining, which differs from standard ones, is one of possible directions for enhancement of technological prospects of grinding process.…”