Producing cylindrical gears by high-speed grinding

Abstract

The goal research consists in the analysis and synthesis of technological schemes, processes, tools and equipment for processing of conical gears and precession gears with medium module. A new processing method which allows to intensify the process of processing as a result is proposed. It ensures a required accuracy of processing. The theoretical researches are based on the theory gear drives, theory of involute profiles generation and precession gears, generating machine, tool design theory machine building technology. Methods of mathematical analysis, analytic geometry, mathematical model and 3D computer model are used. The experimental researches were conducted in laboratories of departments of machine manufacturing technology and fundamentals of machines design in the Technical University of Moldova, by using machines and technological equipment for machining and testing. Experimental data processing were accomplished using approximation methods and mathematical statistics.

Impact strength of underground cement materials

“…The transition to new types of concrete is due to high achievements in the field of plasticisation of concrete and mortar mixtures and the appearance of the most active pozzolanic additives -microsilica, dehydrated kaolin, and highly dispersed sol [1][2][3][4]. In recent years, the concept of the use of rheologically active monomineral and polymineral fine powders of a micrometric scale level based on ground rocks has been implemented in the production of high-quality concretes [5][6][7].…”

“…As a result of the performed studies, the authors of [3,4,8,9,12,13,15] developed powder-activated concrete with a strength class of B100-B140 with a low specific consumption of cement per unit of compressive strength not exceeding 3-6 kg / MPa.…”