Fundamental Study on Factors of Mold Releasability from Milling Surface in Compression Molding of Thermosetting Phenol Resin

In this study, factors of mold releasability from workpiece surfaces processed by milling which is generally applied to metal molds were investigated. The several workpiece surfaces with different surface roughness were processed mainly by varying feed pitch of a ball end mill. As a result of mold releasability test of the surfaces with different surface roughness and investigation of relationships between surface roughness parameters and mold release forces, the mold release force tends to increase as maximum height roughness Rz and average length RSm increase. It is considered that physical anchor effects at the compression moldings become stronger with the increases of Rz and RSm.