The seventh Chinese international machine tool exhibition is hold in Peking. This exhibition has such characteristic that the machine tools are mainly numerical controlled ones, and that it is the general trend, that ...The seventh Chinese international machine tool exhibition is hold in Peking. This exhibition has such characteristic that the machine tools are mainly numerical controlled ones, and that it is the general trend, that the machine tools have some functions of the personal computers, and that the exhibition of the five axle joint movement machine tools show that we have made a great break-through on the field, and that the nanometer machine tools draw so much attention on it and that the cutting speed are becoming higher and higher. The developing direction of our machine tool industry depends on strengthening to adjust the calling and that the enterprise must complete the reformation to itself and carrying forward enterprise informationizing and strenthening scientific research.展开更多
To investigate the influence of temperature field of friction stir welding(FSW)2219 aluminum alloy thick plate,and to achieve effective prediction of temperature field,the authors establish a three-dimensional numeric...To investigate the influence of temperature field of friction stir welding(FSW)2219 aluminum alloy thick plate,and to achieve effective prediction of temperature field,the authors establish a three-dimensional numerical simulation model of FSW 18 mm thick 2219 aluminum alloy based on ABAQUS/CEL,considering the morphological characteristics of the tool pin.The simulations of plunging,dwelling,and welding stages are achieved.The distribution of temperature and temperature cycle curve of characteristic points in welding process are obtained.The validity of the simulation results is verified by experiments.The influence of the tool-rotational speed and welding speed on temperature field is explored.The work lays a foundation for the prediction and control of temperature field in FSW medium thickness 2219 aluminum alloy,and provides reference for selection of welding parameters to ensure high quality welding of fuel tank of heavy-lift rocket.展开更多
文摘The seventh Chinese international machine tool exhibition is hold in Peking. This exhibition has such characteristic that the machine tools are mainly numerical controlled ones, and that it is the general trend, that the machine tools have some functions of the personal computers, and that the exhibition of the five axle joint movement machine tools show that we have made a great break-through on the field, and that the nanometer machine tools draw so much attention on it and that the cutting speed are becoming higher and higher. The developing direction of our machine tool industry depends on strengthening to adjust the calling and that the enterprise must complete the reformation to itself and carrying forward enterprise informationizing and strenthening scientific research.
基金supported by the National Key Research and Development Program of China(Grant No.2019YFA0709003)Dalian Science and Technology Innovation Fund(Grant No.2020JJ26GX041)the Fundamental Research Funds for the Central Universities(Grant No.DUT20ZD204)。
文摘To investigate the influence of temperature field of friction stir welding(FSW)2219 aluminum alloy thick plate,and to achieve effective prediction of temperature field,the authors establish a three-dimensional numerical simulation model of FSW 18 mm thick 2219 aluminum alloy based on ABAQUS/CEL,considering the morphological characteristics of the tool pin.The simulations of plunging,dwelling,and welding stages are achieved.The distribution of temperature and temperature cycle curve of characteristic points in welding process are obtained.The validity of the simulation results is verified by experiments.The influence of the tool-rotational speed and welding speed on temperature field is explored.The work lays a foundation for the prediction and control of temperature field in FSW medium thickness 2219 aluminum alloy,and provides reference for selection of welding parameters to ensure high quality welding of fuel tank of heavy-lift rocket.
