Investigation On The Die-Casting Processes Of The Thin-Wall Components And Relative Metallograph Problems

The magnesium alloy die casting products have many advantages, and in 3C industry they have gradually substituted plastics to be the main manufactures, which include notebook shells, mobile phone frames, playing machine groupware and so on. As the die-casting process is comparatively complex, there are always many problems in the manufacturing. These problems include not only the manufacture's defects, such as hot-crack, cold line, surface pile-out, hard spots and so on, but also the accessorial instrument matters, such as the crucible cracks. These problems cause die casting efficiency low and product cost high. The die casting process, and relative metallograph problems studied by a series of testing means including SEM, TEM, metallograph microscope and so on have systemically been investigated. The main conclusions are drawn as follows:1. From P-Q~2 diagram, it can be got the feasible die-casting operating zone from which a series of parameters were obtained to produce excellent components. The optimal die filling time can also be calculated in a range of 34~46ms, which is suitable for the manufactures of the components with the thickness of 1 mm.2. According to result of calculating simulation, product characteristics...