PRODUCTION OF SINTERED ALUMINUM ALLOY PARTS

摘要

PURPOSE:To continuously execute a series of stages from a heating treatment to sintering and to improve productivity by subjecting quickly cooled and solidified powder of Al alloy to the heating treatment then injecting the powder into a mold by an injecting molding machine and sintering the molding. CONSTITUTION:The Al alloy powder P is supplied into a chamber 10 in which an inert atmosphere is maintained. The powder is subjected to the heating treatment by a heating treatment device 30. The powder P subjected to the heating treatment is fed to the injection molding device 50 and is inserted from the rear tail part of a cylinder 51 into the cylinder 51. While the powder P is heated to a prescribed temp. by a heater 54 around the cylinder 51, the powder is press-fed forward by the rotating motion of a screw 52 in the cylinder 51 and is injected from a nozzle 53 at the front end of the cylinder 51 into the mold 56 placed in front thereof. The oxide films of the powder P are broken down in the process of injecting the powder from a nozzle 53 at and under a high pressure and high speed and is injected in this state into the mold 56. The powder is heated and held and the substantial sintering is completed.