Beta 1


Title Cold forging of micro componints
Author Trevisan, Matteo
Supervisor Hansen, Hans Nørgaard (Institut for Produktion og Ledelse, Danmarks Tekniske Universitet, DTU, DK-2800 Kgs. Lyngby, Denmark)
Arentoft, Mogens (IPU, Danmarks Tekniske Universitet, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2007
Abstract In the last years the demand for microparts has been constantly increasing. So far these parts have been manufactured mainly through turning and milling operations or chemical etching, which are expensive and wasteful production methods. In such a contest, the idea of the Masmicro project was developed, whose aim is to develop new knowledge on the manufacturing of mini/micro components, convert the knowledge into new technologies and transfer them to the industry. This master thesis is focused on the RTDs 3 and 4 of the Masmicro project, where the machine system is designed including transfer system. The main aim of this project was the design, construction and test of a rig which allowed for mini-billets handling. The developed solution would be implemented into a two-steps cold forging process, in order to move billets from the billet preparation station to the first forming stage. Due to the need of high speed and simplicity, a one-dimensional linear transfer system has been chosen. A gripper is needed to hold the billet when transferred into the transfer mechanism. A gripping solution based on adhesive forces arising from surface tension has been proposed. Tests showed that adhesive forces occurring when gripping cleaned billets (i.e. with only a thin film of moisture on their surfaces) with a cylindrical-shaped bore were not sufficient to hold them inside the bore. On the other hand, adhesive forces arising when some contaminant was present (such as a thin layer of lubricant), were enough to hold the billets inside the cylindrical-shaped bore. A prototype of the transfer system was engineered and manufactured. Tests were carried out in order to verify the efficacy of the developed system. It was not possible to move the billet from the feeding bore to the bore which simulates the first forming stage, because of an error in the position of this last one. Therefore tests were performed moving the billet from the feeding to the discharge bore, whose position and dimension allowed for a proper alignment. Analysis proved that the principle of the transfer system would work satisfactorily, once introduced into the production line.
Pages 74
Fulltext
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Admin Creation date: 2008-02-08    Update date: 2008-02-08    Source: dtu    ID: 210407    Original MXD