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Kongens Lyngby, Denmark

Eriksen R.S.,IPU | Arentoft M.,IPU | Gronbaek J.,Strecon | Bay N.,Technical University of Denmark
CIRP Annals - Manufacturing Technology | Year: 2012

The tool surface topography is often a key parameter in the tribological performance of modern metal forming tools. A new generation of multifunctional surfaces is achieved by combination of conventional tool manufacturing processes with a novel Robot Assisted Polishing process. This novel surface texturing method allows for a large degree of freedom in specifying surface characteristics and facilitates a high degree of reproducibility between samples surfaces. A series of strip reduction tests, equivalent to a metal forming ironing process, are conducted to benchmark the tribological performance of 15 generated tool surfaces. © 2012 CIRP.

Arentoft M.,IPU | Eriksen R.S.,IPU | H.n.hansen,Technical University of Denmark | Paldan N.A.,IPU
CIRP Annals - Manufacturing Technology | Year: 2011

The industrial demand for micro mechanical components has surged in the later years with the constant introduction of more integrated products. The micro bulk forming process holds a promising pledge of delivering high quality micro mechanical components at low cost and high production rates. This work describes a number of prototype system units, which collectively form a desktop sized micro forming production system. The system includes a billet preparation module, an integrated transfer system, a temperature controlled forming tool, including process simulation, and a dedicated micro forming press. The system is demonstrated on an advanced micro forming case where a dental component is formed in medical grade Titanium. © 2011 CIRP.

Krusic V.,University of Ljubljana | Krusic V.,Iskra Avtoelektrika D.d. | Arentoft M.,IPU | Masera S.,Iskra Avtoelektrika D.d. | And 3 more authors.
Journal of Materials Processing Technology | Year: 2011

Press and tool deflections have significant influence on the accuracy of products and tool service life in cold-forging processes. This paper presents a combined experimental-numerical approach to determine the deflections of the workpiece-tool-press (WTP) system and tool loads to improve product accuracy in a multistage cold-forging process. The measurements of deflections of the vertical mechanical press for the determination of the press flexibility matrix were performed in dynamic operating conditions. Numerical modelling of the vertical mechanical press and a multistage forging system was performed in order to evaluate the tool loads, the displacements and the rotations of the entire WTP system. The press flexibility matrix in combination with finite element (FE) model of the press and multistage process enable predictions of the elastic displacements and rotations of the tool and the press ram as well as determination of the evolution of the resultant force in order to design a reliable multistage cold-forging process. By redesigning the time sequences and evolution of the multistage forming operations during the press stroke, the evolution of the resultant force and the torque are optimized. This approach has been successfully applied to improve the prediction of tool loads, WTP deflections and rotations for the production of the automotive starter side plate. © 2010 Elsevier B.V. All rights reserved.

Zhang Y.,Technical University of Denmark | Hansen H.N.,Technical University of Denmark | De Grave A.,Technical University of Denmark | Tang P.T.,IPU | Nielsen J.S.,Technical University of Denmark
International Journal of Advanced Manufacturing Technology | Year: 2011

Laser induced selective activation (LISA) is a molded interconnected devices technique for selective metallization of polymers. On the working piece, only the laser-machined area can be metalized in the subsequent plating. The principle of the technology is introduced. Surface analysis was performed on the laser-machined polymer using an Alicona InfiniteFocus® microscope. Based on previous experiments, bearing area curve and its parameters are chosen to characterize the surface. In this paper, by comparison of plateable and non-plateable surfaces, and two types of plateable surface made by different lasers, it is found that the normalized bearing area curve is an effective method to characterize porous surface for the subsequent plating. The normalized parameters are available to make a quantitative analysis. © 2010 Springer-Verlag London Limited.

Hein L.,IPU
Smart Innovation, Systems and Technologies | Year: 2013

The most powerful and concentrated sources of technology know-how and innovation lies with our technical universities. Making this source of know-how and innovation operational for private and public companies holds a tremendous potential for development and growth. However, most reports on the cooperation between university and industry seem only to document the many problems and pitfalls experienced when the two very different cultures meet and interact. And most analysis on the actual volume of cooperation between university and industry indicates that we fall very much short of the potential that could be reached.

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