共查询到18条相似文献,搜索用时 66 毫秒
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根据叶片的曲面特征,提出了基于等残留高度的叶片五坐标数控螺旋铣加工方法,设计了刀具轨迹生成算法,在UG二次开发环境下编程实现.该方法满足相邻刀轨之间的等残留高度要求,无冗余刀轨.避免了刀轨间的抬刀,可实现连续的切削加工,在满足误差要求的前提下可显著提高加工的效率. 相似文献
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汽轮机叶片的材料是一种难加工材料,而砂带磨削是一种高效、节能的新的磨削工艺方法。本文介绍将汽轮机叶片的复杂型面以破带磨削技术来进行数控加工,不但提高了叶片型面的加工质量,而且提高了加工效率。本文对其他难加工工件的二维成形表面的加工,也具有普遍的意义. 相似文献
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对采用鼓形砂轮周磨自由曲面的刀位计算进行了研究。为了提高加工效率,提出了一种基于避免加工中砂轮和工件曲面局部干涉的鼓形砂轮几何参数的优化方法。在刀位计算中,砂轮被限定在摆刀平面中旋转;离散鼓形砂轮表面,计算采样点到工件曲面的有向距离,获得当前刀位的加工误差分布和加工带宽;以砂轮轴和工件曲面最小法曲率方向的夹角为优化变量,以当前刀位的加工带宽的最大化为优化目标,用格点法进行了鼓形砂轮周磨自由曲面的刀位优化。利用UG二次开发技术编程,生成了Bezier曲面的加工轨迹的计算实例,验证了所提出的砂轮几何参数和刀位的优化算法。 相似文献
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WANG Wei YUN Chao ZHANG Ling GAO Zhihui Robotics Institute Beihang University Beijing China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an China 《机械工程学报(英文版)》2011,(4):647-655
Off-line programming (OLP) system becomes one of the most important programming modules for the robotic belt grinding process, however there lacks research on increasing the grinding dexterous space depending on the OLP system. A new type of grinding robot and a novel robotic belt grinding workcell are forwarded, and their features are briefly introduced. An open and object-oriented off-line programming system is developed for this robotic belt grinding system. The parameters of the trimmed surface are read from the initial graphics exchange specification (IGES) file of the CAD model of the workpiece. The deBoor-Cox basis function is used to sample the grinding target with local contact frame on the workpiece. The numerical formula of inverse kinematics is set up based on Newton’s iterative procedure, to calculate the grinding robot configurations corresponding to the grinding targets. After the grinding path is obtained, the OLP system turns to be more effective than the teach-by-showing system. In order to improve the grinding workspace, an optimization algorithm for dynamic tool frame is proposed and performed on the special robotic belt grinding system. The initial tool frame and the interval of neighboring tool frames are defined as the preparation of the algorithm. An optimized tool local frame can be selected to grind the complex surface for a maximum dexterity index of the robot. Under the optimization algorithm, a simulation of grinding a vane is included and comparison of grinding workspace is done before and after the tool frame optimization. By the algorithm, the grinding workspace can be enlarged. Moreover the dynamic tool frame can be considered to add one degree-of-freedom to the grinding kinematical chain, which provides the theoretical support for the improvement of robotic dexterity for the complex surface grinding. 相似文献
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通过对大螺旋角刀具刀尖圆角所形成的空间曲线进行分析,找到形成该空间曲线的方法,给出一种支片工装的结构,从而实现大螺旋角刀具刀尖圆角的磨削。 相似文献