Controlling of workpiece distortion by quenching in flexible Fluid Jet Fields∗

S. Schüttenberg; F. Krause; M. Hunkel; H.-W. Zoch; U. Fritsching

doi:10.3139/105.100424

Article

Controlling of workpiece distortion by quenching in flexible Fluid Jet Fields∗

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Published/Copyright: May 11, 2013

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From the journal HTM Journal of Heat Treatment and Materials Volume 62 Issue 4

Abstract

The distortion behaviour of a workpiece within the heat treatment process can be controlled by applying inhomogeneous quenching conditions. Locally variable heat transfer conditions at the workpiece surface within the quenching process are realizable by impressing and regulation of adjustable (spatially and/or timewise varying) flexible flow fields on the basis of jet arrays inside the quenching media. With the use of these adapted jet fields it is possible to generate various asymmetric quenching conditions for the heat treatment process. The asymmetric jet quenching process of workpieces originally has been developed in gaseous flow. By controlled quenching in liquid media like water or hardening oil and by means of jet or spray cooling with these media, the heat transfer process can be heavily increased thereby controlling the non-available boiling process and the establishing of the rewetting front on the workpiece surface. This e.g. can be realized by the use of impinging jet cooling by means of a flexible array of liquid jets.

Kurzfassung

Im Wärmebehandlungsprozess kann das Verzugsverhalten von Bauteilen durch die Erzeugung inhomogener Abschreckbedingungen beeinflusst werden. Lokale, variable Wärmeübergangsbedingungen an der Werkstückoberfläche werden durch die Aufprägung und Regelung angepasster (räumlich und/oder zeitlich variierender) Strömungsfelder auf der Basis von flexiblen Jetströmungen realisierbar. Mit der Anwendung dieser Jetfelder ist es möglich, verschiedene asymmetrische Abschreckbedingungen im Wärmebehandlungsprozess zu erzeugen. Der asymmetrische Abschreckprozess von Bauteilen in Düsenfeldern wurde ursprünglich für die Gasabschreckung entwickelt. Durch gesteuertes Abschrecken in flüssigen Medien, wie z.B. Wasser oder Härteöle, und durch den Einsatz von Jet- oder Spraykühlung mit diesen Medien kann der Wärmeübergangsprozess durch die Kontrolle der Siedephase und der Wiederbenetzungsfront auf der Werkstückoberfläche erheblich erhöht werden. In der Anwendung wird dies z.B. durch die Erzeugung von Prallstrahlen in einem flexiblen Flüssigkeits-Jetfeld realisiert.

∗

Lecture held by U. Fritsching at the 5^th Int. Conf. on Quenching and Control of Distortion and the European Conf. on Heat Treatment, 25–27 April 2007, in Berlin.

Dipl.-Ing. Sven Schüttenberg, born in 1965, studied Production Engineering at the University of Bremen and works as research assistant in the main department Process Technology of the Foundation Institute for Materials Science since November 2002.

Dipl.-Ing. Fabian Krause, born in 1979, studied Production Engineering at the University of Bremen, Germany. Since Nov. 2006 he is PhD fellow in the Graduate School “Pore Net” at the University of Bremen.

Dr.-Ing. Martin Hunkel, born in 1966, studied Physics at the University of Karlsruhe and was awarded a PhD at the Freiberg University of Mining and Technology in 1998. Since 1998 he is a research assistant in the main department Materials Science of the Foundation Institute for Materials Science.

Prof. Dr. Ing. Hans-Werner Zoch, born in 1953, studied Mechanical and Process Engineering at the Technical University in Darmstadt and received his PhD at the faculty of Production Engineering at the University in Bremen. From 1980 till 2003 he worked for FAG Kugelfischer Georg Schäfer AG in Schweinfurt and later as Managing Director at Neue Materialien Bayreuth GmbH. Since 2004 he is Professor for Materials Science / Metals at the faculty of Production Engineering at the University in Bremen, Managing Director of the Foundation Institute for Materials Science and Coordinator of the Collaborative Research Center (SFB 570) “Distortion Engineering”.

Prof. Dr.-Ing. Udo Fritsching, born in 1959, is the head in the main department Process Technology of the Foundation Institute for Materials Science of the Group “Multiphase Flow, Heat- and Mass-Transfer” and Professor at the University of Bremen.

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Published Online: 2013-05-11

Published in Print: 2007-08-01

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https://doi.org/10.3139/105.100424