BUILT-UP WORM WHEELS: ENGINEERING, TECHNOLOGIES OF PRODUCTION AND RENOVATION

KHUDOLEY Andrei L., Ph. D. in Eng., Assoc. Prof., Head of High-Precision Surfacing Laboratory, A.V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

BARAN Volha A., Senior Researcher of the Laboratory of Agricultural Engineering Science, Joint Institute of Mechanical Engineering of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

A general approach for design engineering of built-up worm wheels is proposed, which ensures a reduction of the consumption demand of non-ferrous metals, an increase in the resource by using different materials that are the most suitable for the operating conditions in tribological conjugations, and improves the maintainability by using replaceable elements fixed in/on the hub. The worm wheels are classified according to their constructive design. New repairable constructions of built-up worm wheels comprising the “steel-bronze” bimetallic elements: a rim, a nut and a sliding bearing are developed. These constructions allow to restore worn surfaces, to apply an appropriate materials and technologies to make the wheel and to repeatedly use the hub. The basic requirements for engineering such design and used materials are outlined. An algorithm for calculating built-up worm wheels with replaceable bimetallic elements is proposed based on the use of two- and three-layer cylindrical models, which allows to reduce the thickness of working layer. The three-layer model is represented by the hub cylinder and the pressed cylinder of a bimetallic element with an equivalent diameter for calculating the rim or the nut. The analysis of manufacturing technologies of worm wheels with a diameter up to 6300 mm is performed. The nomenclature of worm wheels used in six-spindle lathes is made. The features of repairing of a worm wheel with a diameter of 425 mm using a centrifugal method are disclosed. It is shown, that the developed constructions additionally allow obtaining the required tightness after machining the hub interface surfaces by manufacturing the replacement elements with new repair coupling size. It is revealed that the use of built-up worm wheels makes it possible to diminish the coefficient of applicability of non-ferrous alloys from 1.0 (for all-bronze ones) to 0.1–0.25 depending on the overall dimensions.

built-up worm wheel, bimetallic exchangeable element, worm wheel production and renovation technologies

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