... :http://www.dewin-powdermetallurgy.com, postive displacement pump, also named gear pump, internal gear pump. It consists of the inner rotor and ... powder pressing at first, sintering and then do coining, grinding, heat treatment.Density: 6.4-7.0 g/cm³Hardness: HRC ... surfaces can reach 0.03 mm.Quality control system of oil pump gerotor:Work instruction paper and pictures at each working positionProcess ...