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This paper describes the results of fundamental experiments conducted by  injection mold with permeability fabricated by Metal Laser Sintering  Combined with High Speed Milling. Metal Laser Sintering Combined with High  Speed Milling is attracting attention as a new mold fabrication approach.  This machining method combines the metallic powder layer fabrication method  with high-speed cutting. Since this process does not have the problem of  tool L/D in usual cutting, it provides outstanding shape machining  performance of deep ribs etc. Moreover, with this processing method,  sintered density can be controlled by changing the exposure conditions of  the laser beam, and gas permeable structures can also be manufactured. This  fabrication method does not require the mold to be divided. From these  features, this method is expected to offer such advantages as quick delivery  of molds and low manufacturing costs. However, little is known about the  application of laser sintered metallic molds which have gas permeability  structure to plastic injection molding, and the practical use of these molds  is not easy. The aim of this research was therefore to investigate the gas  permeable structures realized by laser sintered metallic mold in plastic  injection molding The results confirmed that permeable injection molds are  effective for influencing residue air in products.

Permeability Characteristics and Applications of Plastic Injection Molding Fabricated by Metal Laser Sintering Combined with High Speed Milling