To improve the industrialization of the process,the study of a thixoforming line stability was proposed.The thixoforming line is fully automated to optimize the repeatability of the experiments.Parameters of the heati...To improve the industrialization of the process,the study of a thixoforming line stability was proposed.The thixoforming line is fully automated to optimize the repeatability of the experiments.Parameters of the heating cycle,the slug temperature,the tool temperature and the forming speed were studied.For each of them,a range of the expected variations in a steady-state process as well as the effects of these variations on the process itself(forming load and parts quality) were given.These variations are shown to be acceptable.Three different tools were used in the experiments.Some mathematical simulations were realized on the finite elements code Forge2008with a semi-solid constitutive law.The capacity of the model to represent the process stability was discussed.The simulation results are in agreement with the experiment results.展开更多
The aim of this work is to attempt the application of A357 Al-Si-Mg cast alloy in the thixoextrusion process,evaluating the different forming parameters effect.Thixoextrusion offers several advantages compared with tr...The aim of this work is to attempt the application of A357 Al-Si-Mg cast alloy in the thixoextrusion process,evaluating the different forming parameters effect.Thixoextrusion offers several advantages compared with traditional hot-extrusion such as lower pressure,minor friction forces,higher material fluidity and longer tool life.This type of semi-solid process requires high solid fraction(0.7<fs<1) materials because of its low solidification rate.Aluminium alloy A357 is a commercial cast alloy characterized by high strength,ductility and corrosion resistance.It is commonly used for cast production of automotive components and it is also suitable for semi-solid process,due to its wide range of solidification.A357 aluminium alloy was used as a feedstock for thixoextrusion in order to investigate thixoformability at high solid fraction.A357 alloy with high solid fraction(>0.85) is less sensitive to temperature drops and allows more stable material flow at higher speeds.To know the forming parameters that improve the mechanical properties of thixoextruded parts,some extrusion tests were carried out.The results were used as the main criteria for assessing the thixoforming viability of the A357 alloy.展开更多
基金Project (415814) supported by the FIRST Europe,THIXOFROR
文摘To improve the industrialization of the process,the study of a thixoforming line stability was proposed.The thixoforming line is fully automated to optimize the repeatability of the experiments.Parameters of the heating cycle,the slug temperature,the tool temperature and the forming speed were studied.For each of them,a range of the expected variations in a steady-state process as well as the effects of these variations on the process itself(forming load and parts quality) were given.These variations are shown to be acceptable.Three different tools were used in the experiments.Some mathematical simulations were realized on the finite elements code Forge2008with a semi-solid constitutive law.The capacity of the model to represent the process stability was discussed.The simulation results are in agreement with the experiment results.
基金the University of Liège for the experimental supportthe Walloon Region (First Europe project)the COST 541 for their financial support
文摘The aim of this work is to attempt the application of A357 Al-Si-Mg cast alloy in the thixoextrusion process,evaluating the different forming parameters effect.Thixoextrusion offers several advantages compared with traditional hot-extrusion such as lower pressure,minor friction forces,higher material fluidity and longer tool life.This type of semi-solid process requires high solid fraction(0.7<fs<1) materials because of its low solidification rate.Aluminium alloy A357 is a commercial cast alloy characterized by high strength,ductility and corrosion resistance.It is commonly used for cast production of automotive components and it is also suitable for semi-solid process,due to its wide range of solidification.A357 aluminium alloy was used as a feedstock for thixoextrusion in order to investigate thixoformability at high solid fraction.A357 alloy with high solid fraction(>0.85) is less sensitive to temperature drops and allows more stable material flow at higher speeds.To know the forming parameters that improve the mechanical properties of thixoextruded parts,some extrusion tests were carried out.The results were used as the main criteria for assessing the thixoforming viability of the A357 alloy.
