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      Presshärten: Schnelle und homogene Stahlplatinenerwärmung mit Hilfe der Induktionstechnik Translated title: Press-Hardening: Rapid and Homogeneous Heating of Steel Sheets by Induction Technology

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          Kurzfassung

          Für den Bau leichter Fahrzeuge hat sich das Presshärten von Stahlblechen in den vergangenen Jahren hin zu einer wichtigen Fertigungstechnologie entwickelt. Bei dieser Technologie werden Stahlplatinen vor dem Presshärten in langen Durchlauföfen erwärmt. Eine Möglichkeit zur Steigerung der Wirtschaftlichkeit des Prozesses sind alternative Methoden zur Erwärmung der Platinen. Ein Ansatz ist die Verkürzung der Erwärmdauern mit Hilfe der Induktionstechnik. Dabei ergeben sich verfahrensbedingt deutliche Unterschiede zur Ofenerwärmung, insbesondere was die erzielbare Temperaturhomogenität betrifft. Im Rahmen dieser Arbeit werden dazu Erwärmversuche mit verschiedenen Induktortypen durchgeführt und miteinander verglichen. Die Vor- und Nachteile der verschiedenen Induktorgeometrien und der entsprechenden Einflussgrößen werden abgeleitet und unter Zuhilfenahme der numerischen Simulation bewertet. Basierend darauf werden mögliche Grenzen der induktiven Erwärmung aufgezeigt.

          Abstract

          Press hardening of steel has developed into an important manufacturing technology in recent years, as a method of building lighter vehicles. By this technology steel sheets are heated in long furnaces before they are press hardened. Possibilities to increase the economic viability of the process are alternative heating methods. A starting point is the use of induction technology to reduce the heating time. Because of that heating concept clear differences are ensued compared with the heating in a furnace, especially the temperature homogeneity. This research is undertaking heating experiments with different inductors which are compared. The advantages and disadvantages of the different inductor geometries and their correspondent influences are inferred and evaluated by numerical simulation. Based on that, possible limitations of the inductive heating are identified.

          Most cited references15

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          Neue Entwicklungen beim Presshärten von Karosseriebauteilen

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            Optimised press-hardening process using spray cooling – process integrated heat treatment of 22MnB5 sheet metal

            Press-hardening is a comparatively time consuming forming process since both forming as well as quenching is performed in the die tool. In order to accelerate this process, an alternative cooling strategy is considered which is based on spray cooling outside the die tool. The object of our investigation is 22MnB5 material. Quenching tests show that sufficient cooling rates greater than 50 K/s can be obtained by means of water-air spray cooling using two-component nozzles. The strength values and fracture strains realised here correspond to the mechanical properties attainable during press-hardening. Furthermore, a plant design is presented which is suitable for cooling vehicle body parts such as tunnels in order to reduce the turnaround time by means of prematurely removing the components from the die-forming tool and subsequently cooling in a spray field.
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              Numerische Untersuchungen induktiver Erwärmungsprozesse für das Presshärten

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                Author and article information

                Journal
                htme
                HTM Journal of Heat Treatment and Materials
                Carl Hanser Verlag
                1867-2493
                2194-1831
                11 December 2014
                : 69
                : 6
                : 333-338
                Affiliations
                1 Daimler AG, Benzstraße, 71059 Sindelfingen
                2 Daimler AG, Sindelfingen
                3 Lehrstuhl für Umformtechnik, Universität Siegen
                4 Institut für Automatisierungs- und Softwaretechnik, Universität Stuttgart
                Author notes
                5 tobias.todzy@ 123456daimler.com (Kontakt/Corresponding author)
                Article
                HT110238
                10.3139/105.110238
                f9c6cd6a-7ff1-4a08-a5f8-cdb53b05a8e2
                © 2014, Carl Hanser Verlag, München
                History
                Page count
                References: 15, Pages: 6
                Categories
                Fachbeiträge/Technical Contributions

                Materials technology,Materials characterization,General engineering,Mechanical engineering,Materials science
                Warmumformung,Presshärten,Schnellerwärmung,Zykluszeit,Induktive Erwärmung,Hot forming,press hardening,rapid heating,cycle time,induction heating

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