Newer Developments in Improving The Intensity, Flexibility and Controllability of Oil Quench Systems in Sealed Quench Furnaces

B. Edenhofer:
NEWER DEVELOPMENTS IN IMPROVING THE INTENSITY, FLEXIBILITY AND CONTROLLABILITY OF OIL QUENCH SYSTEMS IN SEALED QUENCH FURNACES
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New challenges in heat treatment and surface engineering – conference in honour of prof. Božidar Liščić (09 – 12 June 2009, Dubrovnik – Cavtat, Croatia)

ABSTRACT:
Oil quench systems of batch furnaces in the past had very little flexibility with respect to varying the quench intensity. Today’s requests of adapting the quenching intensity of oil quench systems to the needs of different components with respect to hardenability and minimized distortion led to the development of a new oil quench system. The new system has a largely increased agitation system. It produces a uniform oil flow through the load section and allows an adjustable oil flow speed. This increases the utilization of oil quench systems and makes the hardening of less alloyed materials and thicker sections possible.
The experience with this new quench system using adapted quenching cycles for different components, especially gear components, are demonstrated.
A special quench sensor measuring the heat transfer coefficient in the convection phase of the quenching is helpful in setting-up complex quenching cycles. It is also useful for quench cycle documentation, quench tank mapping and quench tank bench marking.


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