粉末圧粉積層と切削加工による超硬合金の三次元造形

概要

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In order to produce three-dimensional models with cemented carbide powders, a free form fabrication method named Layered Compaction Manufacturing (LCM), which is a hybrid process of powder compaction combined with CNC milling in layer-by-layer additive manner, is proposed. Each layer is created by compacting powder with subsequent milling of grooves corresponding to a cross-sectional shape of the designed model. The grooves are filled with paraffin wax as a separator. After being separated according to the grooves, the green model is sintered. The feasibility of the LCM method is evaluated using WC-9mass%Co powder. The shape deformation of the grooves in the compaction processes is less than 0.1 mm. The connecting strength between the layers of the model after sintering is measured by the three-point bending test. It is found that the transverse strength of the sintered products is higher than 2 GPa. A WC-9mass%Co model with inside channels, which has a potential to realize molds and dies with temperature control, is successfully fabricated.
2003-08-05