Lathe process of AZ91D magnesium alloy chips used in semi-solid thixomolding
(1.哈尔滨理工大学材料科学与工程学院，哈尔滨1500402.College of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China)
Abstract: Based on the mechanism of chip breaking and the principle of semi-solid thixomolding, the lathe process of AZ91D magnesium alloys chips used in semi-solid thixotropic injection molding process was studied. With three kinds of turning tools, such as 31303C5, 31003C and 31303C, different chips were gotten. And by one tool with different lathe parameters, different chips were gotten. The results show that, under the needed condition of the thixotropic injection molding machine, the ideal chips are gotten and the size of magnesium alloy chips must be about 35mm, and the turning tool is chosen, whose chip breaker groove is narrower and the depth of cutting is more than 3mm as well as the amount of feed is larger than 0.3mm. The deformation occurs on the microstructure of the chips, and the residual stress is important to the later microstructure of semi-solid state in injection molding.
Key words: magnesium alloy chips； semi-solid； thixotropic injection； lathe process