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Press Shop

Please find information, research projects and publications regarding cold forging presses in this section.

Press Shop

Projects

  • DEFCOM - Improvement of performances of forging processes, Italy:

    The project that involves 14 industrial partners and 4 universities is starting in 2011 (duration of 3 years). The project aims at innovating metalforming machines with regards to (i) productivity and (ii) eco-sustainability of metalforming processes.

 
Publications

  • Kroiß, T.; Engel, U.; Merklein, M.: Comprehensive Approach for Process Modeling and Optimization in Cold Forging Considering Interactions between Process, Tool and Press. J. Mater. Process. Technol. 213(2012)7, 1118-1127                                                   
  • Lehmann, Gunter: 10 MN-Universalpresse – Motivation und Möglichkeiten. International conference MEFORM 2012, March 28th-30th 2012, Freiberg, pp. 76-84, ISBN 978-3-86012-434-5                                                   

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Hydraulic presses

Projects

  • LAST - Development of an automatic line for the stamping and blanking of components with complex geometry and tight tolerances, in collaboration with Omera Presse (2005-2009), Italy:

    The project aimed at developing a new generation of hydraulic presses for high automated metalforming manufacturing processes.

 

Publications

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Mechanical presses

Mechanical presses

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Servo presses

Projects

  • Influence of relative speed and heat generation in cold forging on the tribological system, Institute for Production Engineering and Forming Machines (PtU) Technical University of Darmstadt, Germany:

    Several years ago, the servo press technology was mostly in use for sheet metal forming operations. However, due to recent developments in this technology, its use has gained more and more interest also for companies in the field of bulk metal forming. Flexibly adjustable stroke curves enable a specific control of the forming process by means of a variation of the stroke velocity and, therefore, the relative velocity between tool and workpiece. Hence, a study was conducted in order to investigate the influence of the relative velocity and the heat generation on the performance of characteristic lubrication systems. The results obtained by using the Sliding Compression Test show, that increasing relative velocities have a positive influence on the friction coefficient. Thereby, an increase of the temperature at the tool/workpiece interface has a major impact and decreases the friction coefficient. These observations could be verified by numerical simulations and a test setup on the servo press at the PtU. (Contact: Dipl.-Ing. Sebastian Zang)
  • Development of flexible processes on a Multiple Point Servo Press, Institute for Production Engineering and Forming Machines (PtU) Technical University of Darmstadt, Germany:

    Cold forging is mainly applied if high production volumes and narrow tolerances are required. Since the properties of semi-finished parts are exposed to fluctuations, a quality control is required to achieve the desired properties of the products. This requires appropriate sensors to measure the product properties during the process and a controller logic as well as flexible actors, which are able to influence the process. If sensor integration is not possible or not economic, models can be used to predict the current state of the product properties during the process. These models are fed by easily measureable values, like machine and tool parameters, as well as the properties of the semi-finished part or material. The 3D Servo Press can be utilized as a flexible actor, driving tool systems with up to three degrees of freedom. Servo presses in general can combine a flexible ram movement, known from hydraulic presses, with the advantages of mechanical presses with respect to speed and accuracy. Adjusting the ram speed and the stroke length during a ram stroke offers possibilities for improvements in productivity and part quality. Based on the advantages of servo and multiple point servo presses, the 3D Servo Press was designed, which provides a flexible ram motion with three degrees of freedom (DoF). The layout of the 3D Servo Press enables processes with 1-DoF ram motion, like in forging or extrusion, as well as processes with more than one DoF, like in orbital forming. Thus, the concept of the press can be used to realize forming processes with influence on product properties during the process. (Contact: Dipl.-Ing. Stefan Calmano)


Publications

  • Avemann, J.; Calmano, S.; Schmitt, S.O.; Groche, P.: Total Flexibility in Forming Technology by Servo Presses. Second Conference of the German Academic Society for Production Engineering (WGP), 2012.                                                   

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Process monitoring

Process monitoring

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