Tröber, Philipp

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Tröber, Philipp
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Tröber, Philipp
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    Item-typ:Veröffentlichung,
    Einfluss verschiedener Prozessparameter auf die Temperaturentwicklung in der Umformzone beim Durchsetzen von Vergütungsstahl
    (2018)
    Tröber, Philipp
    ;
    Vollertsen, Frank
    ;
    Welm, Markus
    ;
    Alois, Hannes Weiss
    ;
    Demmel, Peter
    Während der Kaltumformung von Blechwerkstoffen kommt es zu einem Temperaturanstieg in der Umformzone. Dieser resultiert neben Reibung hauptsächlich aus der Umwandlung plastischer Umformarbeit in Wärme. Die dabei auftretenden Temperaturen zeigen signifikante Auswirkungen auf den jeweiligen Fertigungsprozess, wie z.B. die Verschleißentwicklung des Werkzeuges oder das Umformverhalten des Blechwerkstoffes. Folglich ist die Kenntnis der auftretenden Temperaturen und deren Abhängigkeit von eingestellten Prozessparametern von hoher Bedeutung. Im Rahmen dieser Untersuchung wurde der Vergütungsstahl C45LC unter variierenden Prozessparametern durchgesetzt bzw. schergeschnitten. Aufgrund hoher Flächenpressungen und Umformgrade wurden diese Fertigungsverfahren verwendet, da hier hohe Temperaturen entstehen. Variiert wurden hierbei sowohl der Durchsetzspalt als auch die Stempelgeschwindigkeit. Die dabei entstehenden Temperaturen wurden während des Prozesses instantan mit einem Werkzeug-Werkstück-Thermoelement gemessen. Die Ergebnisse zeigen einen signifikanten Einfluss der Prozessparameter auf die ermittelten Temperaturen.
    Wissenschaftlicher Artikel
    Band:4
      532  141
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    Item-typ:Veröffentlichung,
    In-situ Temperaturmessung beim schmierstofffreien Durchsetzen von Vergütungsstahl
    (2017)
    Tröber, Philipp
    ;
    Vollertsen, Frank
    ;
    Demmel, Peter
    ;
    Weiss, Hannes Alois
    ;
    Golle, Roland
    Die Kaltumformung gehört zusammen mit dem Scherschneiden zu den wichtigsten Blechbearbeitungsverfahren. Sie ermöglichen die Herstellung präziser Bauteile bei hohen Hubzahlen. Eine hohe Wirtschaftlichkeit kann dabei nur durch lange Wartungsintervalle und einem stabil laufenden Prozess erreicht werden. Einer der wichtigsten Faktoren in diesem Zusammenhang ist die bei der Umformung im Blech entstehende Temperatur. Diese steigt während des Prozesses aufgrund von in Wärme dissipierender plastischer Arbeit sowie Reibung stark an. Hohe Temperaturen können nicht nur die Bauteileigenschaften sowie deren Qualität, sondern auch den Werkzeugverschleiß signifikant beeinflussen. Aus diesem Grund ist die Kenntnis der vorherrschenden Temperaturen bei der Blechverarbeitung von enormer Wichtigkeit. Stellvertretend für andere Umformverfahren wurde in dieser Untersuchung die Temperaturentwicklung anhand von Scherschneidversuchen ermittelt.
    Wissenschaftlicher Artikel
    Band:Volume 3
      496  131
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    Item-typ:Veröffentlichung,
    Experimental investigation on the thermoelectric current during embossing of Aluminum EN AW 1050
    (2016)
    Tröber, Philipp
    ;
    Frank Vollertsen
    ;
    Roland, Golle,
    ;
    Wolfram, Volk,
    Aluminum is one of the most important materials for lightweight constructions, which has been leading to a steady increase in its consumption for years. Many parts are manufactured by cold forming or blanking. Due to the strong tendency to adhesion, aluminum processing is a big challenge. Adhesive wear deteriorates quality of the formed parts and shortens service times of tools. Minimizing wear is the main goal and only possible by improving the understanding of all wear causing interactions. Beside temperature, thermoelectric currents influence the occurring adhesive wear significantly. In order to understand the relationship between thermoelectric currents and wear, a precise measurement of the occurring currents during manufacturing processes is necessary. Therefore, lubricated and dry embossing and blanking operations with the aluminum alloy EN AW 1050 are carried out and the occurring thermoelectric currents are measured.
    Wissenschaftlicher Artikel
    Band:Volume 2
      420  126
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    Item-typ:Veröffentlichung,
    Thermoelectric currents and their impact on wear behavior of punches during embossing operations
    Tröber, Philipp
    ;
    Vollertsen, Frank
    ;
    Golle, Roland
    ;
    Volk, Wolfram
    The profitability of forming processes strongly depends on tool life. On this account, the main goal is to minimize tool wear. During forming operations, the four main wear mechanisms adhesion, abrasion, tribochemical reaction and surface breakdown appear. Abrasion and surface breakdown depend on the stress conditions and normally occur after several strokes. Adhesion and tribochemical reaction can appear right from the first stroke and are mainly triggered by temperature. Beside the known mechanic parameters influencing wear behavior like the die clearance, there are other aspects insufficiently examined. Thermoelectric currents and voltages occur in every forming tool and their influence on wear behavior has already been proven in the field of machining. However, there are no investigations on these currents and their impact on wear behavior in a forming tool. In this report, thermoelectric currents during lubricated and dry embossing respectively blanking operations were measured. Furthermore, their impact on adhesion and tribochemical reaction was examined.
    Wissenschaftlicher Artikel
      359  144
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    Item-typ:Veröffentlichung,
    Influence of lubrication on the measured thermoelectric volt-age and temperature in the forming zone when embossing S355MC
    (2015)
    Tröber, Philipp
    ;
    Golle, Roland
    ;
    Volk, Wolfram
    Cold Metal Forming is one of the most frequently used sheet metal manufacturing processes because of high material efficiency, accuracy grade and surface quality as well as short cycle times of the produced parts. In order to reach the requirements for both quality of the components and process stability, minimizing tool wear is one of the main aims in this field. One of the most influential factors on wear development is the occurring process temperature. The dissipation of more than 80 % of the plastic work as well as frictional heating lead to a severe temperature rise in the forming zone, especially during processes with high tension between tool and workpiece respectively high strain rates like embossing and blanking. Beside the influence on the mechanical properties of the materials, the temperature rise causes thermoelec-tric voltages and currents. These thermoelectric phenomena in combination with the occurring temperature reinforce the wear mechanisms Adhesion and tribochemical reaction, which determine the tool wear development because they can appear right from the beginning. State of the art is the application of lubricants in order to minimize temperature and consequently wear by reducing friction, removing heat and building reaction layers due to the additives. However, in order to improve the understanding of the interactions between the surfaces of the tool and the sheet metal precise meas-urements of the temperature as well as the occurring thermoelectric voltages are essential. This report shows the measur-ing concept and the appearing thermoelectric voltage, current and temperature during blanking S355MC
    Wissenschaftlicher Artikel
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      381  119
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    Item-typ:Veröffentlichung,
    Lubricant-free forming by affecting thermoelectric currents
    (2020-06-12)
    Tröber, Philipp
    ;
    Welm, Markus
    ;
    Weiss, Hannes Alois
    ;
    Demmel, Peter
    ;
    Golle, Roland
    Cold metal forming belongs to the most important manufacturing processes for sheet metal mass products. To meet increasing requirements concerning part quality and economic efficiency, tool wear has to be minimized. Therefore, most of the forming processes are only feasible with lubricant application. Especially for processes with high tool load, such as blanking or embossing, adhesive wear is a key challenge due to early initiation and high wear rates. Despite the high significance and consequences, like a reduction of part quality and process reliability as well as an increasing risk of severe tool damage, wear-causing interactions are insufficiently understood. One known influencing factor is the temperature in the forming zone, which arises due to the dissipation of conducted forming work. Besides the direct impact on adhesive wear, this temperature rise leads to thermoelectric voltages and currents, whose influence on adhesive wear development has been neglected so far. For this reason, typical tool and sheet materials have been characterized for the first time with regard to their thermoelectric behavior, represented by the Seebeck coefficient. Together with experimental blanking and embossing investigations, basic correlations between process parameters, temperatures, sheet and tool materials, thermoelectric currents as well as adhesive wear could be derived. The findings obtained confirm a strong influence of the direction and strength of thermoelectric currents, which are determined by the difference between the Seebeck coefficients of tool and sheet material, on adhesive wear. Similar thermoelectric behavior of both materials in contact suppresses thermocurrents and resulted in an adhesive wear reduction of 74% during blanking. In addition, the external generation of a regulated current enables to influence thermoelectric currents in strength and direction. An external current adapted to the process reduced adhesive wear by 31%. In sum, two new methods of adhesive wear reduction, which are applicable in every metal manufacturing process, were investigated within this project. Furthermore, the knowledge gained improves the fundamental understanding of wear-causing interactions.
    Wissenschaftlicher Artikel
      286  189