Е-Публикации
Технически университет - София

Abstract: This paper presents a comprehensive design for the main motion drive (MMD) of a multi-operation drilling-milling-boring machine with a modified spindle support. A two-stage drive design with an increased speed range is proposed. A procedure for parametric modeling of the transverse drive layout in a two-criteria formulation is considered. Preliminary design research of a form-generating two-support spindle unit with a reinforced front support mounted according to the "Tandem-X" scheme is carried out. A verification calculation of ball angular-contact bearing (ACB) is implemented in a specialized APM Bear module, based on the general theory of non-ideal surface contact. An analysis of the ACB design parameters is conducted for a typical technological operation: climb milling with an end-mill cutter. A 3D design of a two-stage MMD with a two-support spindle unit is presented in the integrated Creo Parametric CAD environment. Creo tolerance design toolings with stackup-procedure are used to prepare detailed drawing documentation. For photorealistic representation, assembly design rendering options for housing-shaft-bearing and element-by-element exploded views of drive components are proposed. An alternative front spindle support design was developed based on an innovative tapered angular-contact roller bearing. The novelty of the proposed design solution lies in the modified contact geometry between the rolling element and the raceway, aimed at increasing the load-carrying capacity and service life of the spindle-support assembly. Design calculations in the APM Bear module demonstrated a significant increase in durability and load-carrying capacity. The research resulted an alternative competitive design for a two-stage machine tool drive. is proposed.

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