TECHNOLOGY OF REPAIR AND RESTORATION OF LARGE-MODULAR GOLDEN GEAR WHEELS BY HIGH-SPEED WOOD PROCESSING

Abstract

The subject of the research in the article are topical issues related to the development of technology for the repair and restoration of large-sized gears of drives of walking excavators, ore-grinding mills, ball mills. The goal is to develop a new technology for repairing and repairing large-sized gears with a module (m = 12-65 mm). The task is to obtain a guaranteed quality of restoration of gear rims after repair with high-performance machining of large wheels operating in an aggressive abrasive environment. The method of intermittent rolling with the use of disk non-modular cutters is proposed (the dimensions of the mill do not depend on the module of the treated teeth), equipped with ceramic plates and special milling calipers. The method of intermittent rolling is used on gear-grinding and gear grinding machines and has the advantage that at the time of the working stroke of the tool the workpiece is either stationary or makes a slight turn, i.e. The treatment proceeds in comparison with the running-in method, under more stringent conditions. Results of implementation. Two new directions were adopted for the implementation of the new high-speed dental processing technology. The first was the development of simple special milling calipers mounted on the chamfering machines of MAAG (Switzerland). The second accounted for the extremely small number of factories that had MAAG machines, and therefore envisaged the development, manufacture and introduction of special milling calipers to widely used vertically hobbing machines. The introduction of a new technology for repairing and rebuilding toothed wheels during the finishing of hardened wheels with the use of a gear-cutting machine was carried out in production conditions when machining the wheels of a pseudo-planetary gearbox with the following characteristics: m = 28 mm; ; ; ; b = 400; ; steel 34ХМЮАА; HRC 48 ... 54. In comparison with the process of gear grinding, in which tensile stresses are created in the surface layer of the part, the blade treatment is most favorable. Compressive stresses increase wear resistance of parts, contractual and flexural strength of gears. Conclusions. The industrial introduction of new technology of blade machining of repair and restored large-sized gear wheels makes it possible to reduce the labor intensity of a finishing operation 3-4 times, and also eliminates the need to purchase expensive and low-performance gear grinding machines for import. In this case, the surface quality of the teeth is higher than in the case of gear grinding, because Excludes defects such as burns, microcracks.