Е-Публикации
Технически университет - София

Abstract: The article considers the modernized design of the machining center rotary table based on a new design solution for the worm-ball drive. The layout scheme of the horizontal machining center and the kinematics of the feed drive for implementing 4-axis machining are proposed. A draft design of the feed drive with a specialized spindle support bearing is developed. A 3D rotary table project is created in the Creo Parametric CAD environment using parallel design tools. In the process of 3D modeling, a multi-variant approach to the design is used, including an alternative version of the worm drive with backlash-free engagement. When constructing a circular array of worm threads, the effective functionality of Creo is used, associated with a circular shape with the ability to redefine the array. An innovative design of the worm transmission is proposed as a synthesis of a worm and ball screw gear. The main idea of the new worm-ball transmission is to find such design solutions that allow replacing the contact mechanism with sliding friction (the main problem of the classical engagement) with a rolling friction mechanism. For the new transmission, 2D and 3D sketches and models are developed and its declarative patent has been received. Analytical dependencies for calculating the main geometric parameters are given. A comprehensive calculation of the drive transmission was carried out in a specialized module ARM Trans. As a result of the numerical experiment, the effectiveness of the new design solution according to the efficiency criterion is shown.

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