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Wood Chipping with Helical Chippers: Observations Based on the Construction and the Use of Different Prototypes

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Applied Engineering in Agriculture. 28(4): 491-501. (doi: 10.13031/2013.42079) @2012
Authors:   J. Wegener, T. Wegener
Keywords:   Helical chipper, Conescrew knife, Auger, Chipper harvester, Tool geometry, Wood chips, Chipping

The aim of this investigation was to gain empirical knowledge from the practical usage of three different helical chipper prototypes and to determine which construction parameters influence the performance of a helical chipper, the stability of its components and the quality of the wood chips. Initially, a qualitative classification of eight tool, three machine, and two feedstock parameters with respect to their impact on these three target variables was undertaken. Further two-work piece parameters were also included in the classification. These parameters were then described more specifically and justified theoretically. The results of the investigation showed that the interaction of these 15 individual parameters is very complex and it was found that a purely empirical consideration which has been commonly used for helical chippers does not provide an adequate basis for the optimization of their construction. For this reason, the development of theoretical fundamentals for helical chippers is deemed vital, so that the understanding of the principals of this cutting method can be developed further. This can be done by amalgamating the available knowledge about screw theory with that related to chipping processes which have characteristics similar to helical chipping.

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