Some aspects regarding the use of a pneumomechanical high speed forming process
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Date
2012-07-18
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Abstract
A promising approach to the production of thin-walled workpieces in high strength materials
is the use of a special pneumomechanical high-speed-forming process. This process uses a
pneumatically accelerated plunger that dives into a pressure chamber filled with the working
media in order to generate a short pressure pulse. Ways in which the pressure pulse can be
influenced include e.g. varying the type of working media, the density of the working media,
the accelerating pressure distance and the plunger geometry. The influence of these
parameters on the process formed the subject of intense technological research at the Chair
of Forming and Machining Technology (LUF) at Paderborn University. The results of these
investigations were used to achieve an appropriate process and tool design for the
pneumomechanical high-speed forming process. It thus proved possible to manufacture
complex workpieces and geometrical details from thin-walled, high strength stainless steel or
aluminium alloys that cannot be produced by conventional stamping processes. Because of
the high uniformity of the pressure distribution in the radial direction, it is possible to achieve
just small dimensional or geometrical deviations in respect of the desired shape of the
workpiece. The planned paper will present results of the basic research conducted into
pneumomechanical high-speed-forming as well as a comparison with electrohydraulic
forming.
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Keywords
electro hydraulic forming, high speed hydroforming, pneumomechanical forming