High-intensity Light Wire Forming Process And Mechanism

Powder extrusion is an important method for obtaining high-property dense products. The process of powder extrusion forming has been studied and developed extensively in foreign countries. KunMing university of science and technology has made great investment about bi-wheel continuous extrusion equipment and process. Many significant achievements have obtained. Based on these achievements and considered the high-property of powder Al-alloy, the dissertation tried to make high strength, low density powder wires and powder cladding products with metallurgical interface. These products were expected to obtain commercial using before long.Combining with characters of powder, the mechanic of powder plastic deformation, the strengthen cause of powder extrusion products, the effect of surface oxide and powder strengthen materials property and formability of powder extrusion products were introduced and discussed in this dissertation. The main parameters (extrusion ratio, temperature, article size, deformation velocity, configuration of die, lubrication etc.) effecting powder extrusion formability and forming process of powder cladding wire have been analyzed. Using engineering method and upper-bound method, this dissertation deduced a calculation formula for the load of powder radial extrusion. The formula was tested and verified by experimental results. Dies for powder wire, bi-metal and tri-metal cladding products were designed. Using these dies, formability of powder wire and cladding products in different processing parameters has been studied by experiments.The relations, such as the tensile strength of extrusion products to extrusion ratio and contents of powder strengthen materials, the practical load of powder extrusion to contents of powder strengthen materials, extrusion ratio and extrusion velocity, were given by this dissertation. Various defects in powder wire extrusion and powder cladding extrusion were analyzed and the causes v.ere given. Al self-oxide powder, Al2O3 -Al blending powder and SiC-Al blending powder extrusion wires obtained by experiments had high tensile strength as well as high conductibility. The margin of error between practical measuring results and calculation results using formula deduced in this dissertation was under+10%.