The problem of finished surface being not first-order continuous commonly exists in machining sculptured surfaces with a torus cutter and some other types of cutters. To solve this problem, a dual drive curve tool pat...The problem of finished surface being not first-order continuous commonly exists in machining sculptured surfaces with a torus cutter and some other types of cutters. To solve this problem, a dual drive curve tool path planning method is proposed in this article. First, the maximum machining strip width of a whole tool path can be obtained through optimizing each tool position with multi-point machining （MPM） method. Second, two drive curves are then determined according to the obtained maximum machining strip width. Finally, the tool is positioned once more along the dual drive curve under the condition of tool path smoothness. A computer simulation and cutting experiments are carried out to testify the performance of the new method. The machined surface is measured with a coordinate measuring machine （CMM） to examine the machining quality. The results obtained show that this method can effectively eliminate sharp scallops between adjacent tool paths, keep tool paths smooth, and improve the surface machining quality as well as machining efficiency.展开更多
科技人才是实现科技自立自强的核心要素,创新意愿是激发科技人才活力的关键。以236名科技人才为调查对象,采用模糊集定性比较分析方法,在计划行为理论(theory of planned behavior,TPB)框架下探究多要素协同影响科技人才创新意愿的组态...科技人才是实现科技自立自强的核心要素,创新意愿是激发科技人才活力的关键。以236名科技人才为调查对象,采用模糊集定性比较分析方法,在计划行为理论(theory of planned behavior,TPB)框架下探究多要素协同影响科技人才创新意愿的组态路径。研究发现,科技人才高创新意愿的驱动类型有4条路径,即示范性规范-创新态度驱动型、指令性规范-创新态度驱动型、内生态度-主观规范驱动型和创新态度驱动型。创新态度是科技人才产生创新意愿的重要条件;指令性规范与示范性规范是调节科技人才创新意愿的关键要素,两者之间存在替代关系;科技人才的知觉行为控制对增强创新意愿的效果较弱。从组态视角揭示了计划行为理论要素协同影响科技人才创新意愿的复杂因果机理,为组织培养科技人才的创新意愿提供了参考。展开更多
基金National Natural Science Foundation of China (50875012)National High-tech Research and Development Program (2008AA04Z124)+1 种基金National Science and Technology Major Project (2009ZX04001-141)Joint Construction Project of Beijing Municipal Commission of Education
文摘The problem of finished surface being not first-order continuous commonly exists in machining sculptured surfaces with a torus cutter and some other types of cutters. To solve this problem, a dual drive curve tool path planning method is proposed in this article. First, the maximum machining strip width of a whole tool path can be obtained through optimizing each tool position with multi-point machining （MPM） method. Second, two drive curves are then determined according to the obtained maximum machining strip width. Finally, the tool is positioned once more along the dual drive curve under the condition of tool path smoothness. A computer simulation and cutting experiments are carried out to testify the performance of the new method. The machined surface is measured with a coordinate measuring machine （CMM） to examine the machining quality. The results obtained show that this method can effectively eliminate sharp scallops between adjacent tool paths, keep tool paths smooth, and improve the surface machining quality as well as machining efficiency.
文摘科技人才是实现科技自立自强的核心要素,创新意愿是激发科技人才活力的关键。以236名科技人才为调查对象,采用模糊集定性比较分析方法,在计划行为理论(theory of planned behavior,TPB)框架下探究多要素协同影响科技人才创新意愿的组态路径。研究发现,科技人才高创新意愿的驱动类型有4条路径,即示范性规范-创新态度驱动型、指令性规范-创新态度驱动型、内生态度-主观规范驱动型和创新态度驱动型。创新态度是科技人才产生创新意愿的重要条件;指令性规范与示范性规范是调节科技人才创新意愿的关键要素,两者之间存在替代关系;科技人才的知觉行为控制对增强创新意愿的效果较弱。从组态视角揭示了计划行为理论要素协同影响科技人才创新意愿的复杂因果机理,为组织培养科技人才的创新意愿提供了参考。
