Cutting force analysis of a linear cutting process of spruce

摘要

Until today cutting processes were mainly optimized by trial and error to increase yield and surface quality. However, optimization of the cutting process, e.g. reduction of the saw kerf width, improvement of surface quality as well as tool optimization, requires a basic understanding of the interaction between tool and workpiece. However, knowledge-based optimization of cutting processes is lacking from a valid cutting model considering the complex and inhomogeneous structure of wood. Subsequently, out of this analytical description an applicable semi-empirical model, likewise in the metal working industry, is necessary. But, the validation of a cutting force model requires the existence of consistent cutting force values. However, utilization of data from previous studies is impossible as important information about data processing, cutting parameters as well as wood properties is lacking. To enable a validation of the cutting force model, a standardized and reliable method for the examination of cutting forces had to be developed. For slow dynamic cutting processes (6.8 m/s), a pendulum was modified enabling the examination of different cutting directions. For high-resolving cutting force measurements, a force sensor (90 kHz) was mounted between machine table and knife holder allowing force measurements in three directions.