Using the method of blending and two different molecular-weight polycarbonate (PC) particles, a new molecular-weight PC was prepared. Respectively analyzing the tensile property, flow performance and microstructure of three molecular-weight PC.The result shows that the molecular-weight is the main factor what influence the tensile properties and flow performance, the higher molecular-weight, the better mechanical properties, and the poorer flow properties. The tensile property of the new molecular-weight PC is Slightly worse than the original PC, and the flow performance lies somewhere in between.
A drawing and forming technology is studied in this paper for a typical cylindrical component made by high strength steel plates of B340/590 and B400/780 with differential thickness. A finite element analysis is carried out using the software Dynaform to investigate the drawing and forming process of the cylinder. Some processing parameters obtained from the simulation are compared with the data from experiments. The results show that the effective control of blank sizes, holder force and loading modes can improve the thinning ratio of the tailor-welded materials. The drawing limit coefficient m=0.53 is determined by the test. The whole results are well matched in numerical simulations and physical experiments.
The problem during magnesium alloy welding is the key bottleneck of magnesium application in aerospace, aircraft, automotive and other industries. AZ91D magnesium welded joint is obtained using tungsten inert gas (TIG) welding method without filler materials and groove. The microstructure, morphology, composition and micro hardness distribution of welded joint are investigated using scanning electronic microscopy (SEM), EDAX and micro hardness experiment. The results show: (1) Well welded joint of AZ91D magnesium alloy using TIG welding method is obtained under the condition of welding current 152A, welding voltage 13.4V, welding velocity 6.5mm/s and 20L/min Argon shielding gas; (2) Microstructure of welded joint consisted of black matrix phase α-Mg, white eutectic α+Mg17Al12 and gray dendrite.
Metal sheet Stamping forming is an important material forming process, especially in the automobile industry. Using the advanced FEM simulation technology, precise analysis of the metal sheet stamping forming process becomes possible, which provides the scientific evaluation of the process design and die design in sheet stamping forming. So the paper chooses a topical auto drawing part-auto indoor-still part and applied the CR340LA steel to have stamping numerical simulation test by the numerical simulation analyzing software-Dynaform. In the stamping numerical simulation test, the best binder holder force values, stamping speed values and the spring back forecast results are got. Then the springback forecast results of the numerical simulation analysis tests are applied to the actual production to overcoming the spring back effectively, and the successful products are got.
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