The spinning deformation of thin walled tube in necking process is simulated with a dynamic explicit FEM program,LS DYNA3D and the distributions of Cauchy strains and thickness are analyzed through time history to a...The spinning deformation of thin walled tube in necking process is simulated with a dynamic explicit FEM program,LS DYNA3D and the distributions of Cauchy strains and thickness are analyzed through time history to achieve a good understanding of the deformation in necking process by spinning and the numerical simulation results are in good agreement with the test results.展开更多
The process of the neck spinning of oblique tubes is simulated by means of the 3D elastic-plastic finite element software, MSC.MARC. The dynamic boundary and contact problems in simulation are solved. The characterist...The process of the neck spinning of oblique tubes is simulated by means of the 3D elastic-plastic finite element software, MSC.MARC. The dynamic boundary and contact problems in simulation are solved. The characteristics of the metal flowing, the distributions of the stress and strain, the possible defects and areas during spinning are obtained. The influence of the nominal reduction of the blank radius per path on the metal flowing and deformation is also researched theoretically and experimentally. It shows that the nominal reduction of the blank radius per path has great influence on the neck spinning process of oblique tubes. A reasonable nominal reduction of the blank radius per path is very important to guarantee the proceeding of the spinning process and to obtain a sound products.展开更多
An in-neck yoke 14" CRT displaying 1280 TVL live picture is developed.It operates at60℃,64 KHz and 6 Amps,showing normal vacuum properties.Compared with the conven-tional yokes,it reduces the corner spots by 19%...An in-neck yoke 14" CRT displaying 1280 TVL live picture is developed.It operates at60℃,64 KHz and 6 Amps,showing normal vacuum properties.Compared with the conven-tional yokes,it reduces the corner spots by 19%,the material by 36%,and the energy by49%.展开更多
文摘The spinning deformation of thin walled tube in necking process is simulated with a dynamic explicit FEM program,LS DYNA3D and the distributions of Cauchy strains and thickness are analyzed through time history to achieve a good understanding of the deformation in necking process by spinning and the numerical simulation results are in good agreement with the test results.
文摘The process of the neck spinning of oblique tubes is simulated by means of the 3D elastic-plastic finite element software, MSC.MARC. The dynamic boundary and contact problems in simulation are solved. The characteristics of the metal flowing, the distributions of the stress and strain, the possible defects and areas during spinning are obtained. The influence of the nominal reduction of the blank radius per path on the metal flowing and deformation is also researched theoretically and experimentally. It shows that the nominal reduction of the blank radius per path has great influence on the neck spinning process of oblique tubes. A reasonable nominal reduction of the blank radius per path is very important to guarantee the proceeding of the spinning process and to obtain a sound products.
基金Foreign Experts Bureau of the State Council,Ministry of Electronics IndustryGovernment of Jiangsu Province
文摘An in-neck yoke 14" CRT displaying 1280 TVL live picture is developed.It operates at60℃,64 KHz and 6 Amps,showing normal vacuum properties.Compared with the conven-tional yokes,it reduces the corner spots by 19%,the material by 36%,and the energy by49%.
