ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Semisolid forging process requires special movement of the ram, until now onlyachievable with hydraulic presses. The upper die, placed on the press ram, must move fast duringforming of the component in order to reduce segregation phenomena, and, once the part is shaped,the die must squeeze the material so that the contraction of the material is overcome and noshrinkage defects are formed. Traditional mechanical presses are not able to reproduce this kind ofcycles, only possible with hydraulic presses. The introduction of servo motors in mechanical pressesmakes possible the achievement of those requirements, and, therefore, the use of these presses forthe semisolid forging processes. The main characteristic of this type of machines is the eliminationof the flywheel and the clutch; in the solution proposed by the press builder Fagor, the AC servomotor drives the ram of the press by using a transmission based on gears and a crank. This paperpresents some of the results achieved during the semisolid forging of A356 aluminium alloy using a400 tons Fagor servo motor driven mechanical press installed at the University of Mondragon
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.261.pdf
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