Unicase Master - In-line, high-volume, low-distortion, precision case hardening for automotive, transmission and bearing industry
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10516_korecki_wolowiec_korecka_HPGQ_distortion.pdf (679.5 KB)
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2016
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Abstract
Gears are part of mechanical power transmission devices and gear boxes used in machinery and vehicles. They are produced on a massive scale, and for the automotive industry global annual output reaches about 1 billion pieces. Gears are commonly made of steel and have teeth with a hard surface and a flexible core which provides suitable strength and service life. These properties are usually obtained by heat treatment on the basis of atmospheric carburizing and quenching in oil, realized in continuous furnaces. Traditional technology is characterized by low precision and repeatability in process results, large hardening distortion and high material handling costs mostly because of the batch type of heat treatment and inability of integration into in-line manufacturing. There is a very strong industrial need of overcome traditional technology disadvantages and allow heat treatment meets of modern industries requirements. This article introduces an innovative and revolutionary single-piece flow case hardening system by low pressure carburizing and high pressure gas quenching which allows individual adjustment to the size and shape of the particular gear in order to minimize hardening distortion and ensures ideal repeatability of results throughout the gears series. It is a compact system designed for high-volume heat treatment of gears in a lean manufacturing configuration ready for implementation within machining centers. Additionally the article will discuss the operational aspects, process costs and productivity.
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Korecki M., Wołowiec-Korecka E., Brewka A.: Unicase Master - In-line, high-volume, low-distortion, precision case hardening for automotive, transmission and bearing industry, 3rd International Conference on Heat Treatment and Surface Engineering in Automotive Applications / European Conference on Heat Treatment, Prague, 11-13.05.2016