共查询到19条相似文献,搜索用时 593 毫秒
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结合虚拟制造技术对数控加工仿真系统进行了研究,在分析虚拟制造中数控加工仿真技术的基础上,提出了一种可重配置的虚拟加工方法。这种方法通过建立虚拟的部件及部件关系树,根据所需机床的不同类型,来对数控机床的结构进行不同的配置;其中毛坯模型的建立采用的是voxel模型法。此外,运用C++和OpenGL作为开发工具,实现了对数控加工过程的虚拟仿真(即虚拟制造);同时实际应用表明,在虚拟的加工环境下,机床对数控程序的验证时间大大缩短。 相似文献
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本文通过改变切削条件和刀具几何参数,对横向卷曲“C”形屑折断模型进行了实验研究。研究表明:发生横向卷曲的切屑与工件未加工表面后刀面接触后,产生的全约束反力与拉发触面公法线间的夹角小于45℃时,切屑折断为横向卷曲“C”形屑。 相似文献
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结合虚拟制造技术对数控加工仿真系统进行了研究,在分析虚拟制造中数控加工仿真技术的基础上,提出了一种可重配置的虚拟加工方法。这种方法通过建立虚拟的部件及部件关系树,根据所需机床的不同类型,来对数控机床的结构进行不同的配置;其中毛坯模型的建立采用的是voxel模型法。此外,运用C++和OpenGL作为开发工具,实现了对数控加工过程的虚拟仿真(即虚拟制造);同时实际应用表明,在虚拟的加工环境下,机床对数控程序的验证时间大大缩短。 相似文献
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虚拟加工的主要任务是预测和改进被加工件的加工精度。提出了一种新的技术方法以实现虚拟加工的工件受力变形快速模拟。这种方法基于可扩充的典型薄壁元素与变形解析算法库,并辅以预置区域和最小壁厚等方法,把加工中工件可能产生较大受力变形而影响尺寸精度的加工位置作为分析的重点,将变形量简化估算与少量的有限元精确分析相结合,可以提高虚拟加工模拟速度,推进虚拟加工技术的实用化。 相似文献
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Rigid-visco-plastic finite element models are used to simulate the chip formation and cracking in the turning processes with grooved tools. The Johnson-Cook constitutive equation and Johnson-Cook damage model, which are appropriate for high-speed machining, are assumed for the workpiece material properties. Thermal effects in cutting are considered. The tool material is considered as rigid, but heat-conducting, with the properties of tool material H11. The calculated chip back-flow angle, curling radius and thickness are analyzed as three typical chip shape parameters. The effects of land length and second rake angle of the grooved tool on chip formation, cracking and temperature are discussed. Some simulation results are compared with other published analytical and experimental results. 相似文献
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Rigid-visco-plastic finite element models are used to simulate the chip formation and cracking in the turning processes with grooved tools. The Johnson-Cook constitutive equation and Johnson-Cook damage model, which are appropriate for high-speed machining, are assumed for the workpiece material properties. Thermal effects in cutting are considered. The tool material is considered as rigid, but heat-conducting, with the properties of tool material H11. The calculated chip back-flow angle, curling radius and thickness are analyzed as three typical chip shape parameters. The effects of land length and second rake angle of the grooved tool on chip formation, cracking and temperature are discussed. Some simulation results are compared with other published analytical and experimental results. 相似文献
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切削温度与刀具磨损、工件加工表面完整性及加工精度密切相关,其变化规律反映出高速切削过程本质的重要方面。本文应用数值模拟,对高速切削加工过程中切屑、工件和刀具三方面的温度随切削速度、进给量、切削深度的动态变化进行了研究,探讨了其变化规律,其结论有助于优化高速切削工艺及建立高速切削数据库。 相似文献
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