Green Machining Technical Publications
34. Machinability Evaluation of Selected High Green Strength PM Materials: PM parts generally require machining methods and specific tools designed to address the inherent porosity of the finished part. The composition and microstructure of sintered parts often causes machining problems and requires additives to enhance machinability. Currently, conventionally produced ferrous PM parts have an average green strength of approximately 1500-psi. Recent technological advances with organic binders and lubricants, combined with improved compaction technology, have made it possible to produce PM parts with enhanced green strengths. Enhanced green strength makes it possible to machine materials in the green state, thereby reducing manufacturing time and production costs. This paper examines green drilling by applying several machinability and material evaluation methods.