Large strain extrusion machining(LSEM)is a typical process for preparing ultrafine or nanocrystalline strips.It.is based on large plastic deformation.The processing parameters of LSEM in this study were optimized by e...Large strain extrusion machining(LSEM)is a typical process for preparing ultrafine or nanocrystalline strips.It.is based on large plastic deformation.The processing parameters of LSEM in this study were optimized by experiments and simulations.Using the orthogonal array,signal-to-noise ratio,and analysis of variance,the influence and contribution of processing parameters on response variables were analyzed.Because of the difference in processing parameters between optimizing the average grain size and the maximum temperature,the response variables analyzed must be correctly selected.Furthermore,the optimal processing parameters for obtaining the minimum average grain size and the lowest maximum temperature are analyzed.The results show that the tool rake angle is the most important factor.However,the level of this factor required to achieve the minimum average grain size is different from that required to obtain the lowest maximum temperature.The validity of the method is verified through experiments and simulations.展开更多
A new technology of forward extrusion and cross rolling has been developed to process the rear axle shaft sleeve of light truck with the use of tube billets. This technology is characterized by large reductions of mat...A new technology of forward extrusion and cross rolling has been developed to process the rear axle shaft sleeve of light truck with the use of tube billets. This technology is characterized by large reductions of material, energy and cost of production and has significant economical benefits. This technology is stable and reliable. The three rolls transverse rolling mill built based on this technology has novelty construction, higher production efficiency, non-vibration and noise. The research results have been extensively applied to light trucks and farm transport with load of 1 to 3 tones.展开更多
基金support of the National Nature Science Foundation of China(Grant No.51375174)the Fundamental Research Funds for Central Universities(Grant No.2017ZD024)the Natural Science Foundation of Guangdong Province(Grant Nos.S2013050014163,2017A030313260).
文摘Large strain extrusion machining(LSEM)is a typical process for preparing ultrafine or nanocrystalline strips.It.is based on large plastic deformation.The processing parameters of LSEM in this study were optimized by experiments and simulations.Using the orthogonal array,signal-to-noise ratio,and analysis of variance,the influence and contribution of processing parameters on response variables were analyzed.Because of the difference in processing parameters between optimizing the average grain size and the maximum temperature,the response variables analyzed must be correctly selected.Furthermore,the optimal processing parameters for obtaining the minimum average grain size and the lowest maximum temperature are analyzed.The results show that the tool rake angle is the most important factor.However,the level of this factor required to achieve the minimum average grain size is different from that required to obtain the lowest maximum temperature.The validity of the method is verified through experiments and simulations.
文摘A new technology of forward extrusion and cross rolling has been developed to process the rear axle shaft sleeve of light truck with the use of tube billets. This technology is characterized by large reductions of material, energy and cost of production and has significant economical benefits. This technology is stable and reliable. The three rolls transverse rolling mill built based on this technology has novelty construction, higher production efficiency, non-vibration and noise. The research results have been extensively applied to light trucks and farm transport with load of 1 to 3 tones.
