共查询到20条相似文献,搜索用时 78 毫秒
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基于敏感度的运动模拟台误差综合 总被引:1,自引:0,他引:1
位姿误差是影响运动模拟台性能的重要因素。用矩阵微分法推导了平台位姿误差和42种原始误差之间的关系式,定义了平台位姿误差对各种原始误差的敏感度,并建立基于敏感度约束条件的原始误差优化目标函数,给出了按敏感度的比例对原始误差进行综合的优化方法,通过实例验证了基于敏感度的误差综合方法的有效性。基于敏感度的误差综合方法对六自由度运动模拟台的精度设计具有参考作用。 相似文献
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推出了RRPRRP机械手工作位姿误差表达式;分析了工作位姿误差与各构件相关公差间的关系;提出了一种能确保机械手工作位姿精度的新的设计方法。 相似文献
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基于三坐标定位器的大部件调姿机构误差分析 总被引:1,自引:0,他引:1
针对基于3个三坐标定位器联动实现大型部件位姿调整机构的位姿误差问题,采用多体运动学理论分析了机构运动学关系,在不考虑大部件变形的情况下,利用矩阵微分法并结合冗余驱动的特点建立了该调姿机构的位姿误差模型,从而可定量分析各原始误差对调姿对象位姿误差的影响,并通过蒙特卡洛法对调姿误差进行了仿真研究。为获取各原始误差对调姿误差的影响比重,对机构进行了误差敏感度分析,研究结果表明,各导轨的直线度、平行度及三坐标轴间的垂直度等引起的角误差对应的敏感度较大。 相似文献
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磨剃齿刀齿形时,齿根常产生过厚或根切,原因在于砂轮磨削面至剃齿刀轴线的距离大于或小于理论值。用研制的量具,可将其值控制在所需的范围内,一次修磨合格,从而减少修磨次数提高剃齿刀的使用寿命。 相似文献
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论述了进口旧立车改造为CNC四轴数控系统。由旧车的两立车刀架改造为车削、内圆产产磨相结合的新型数控机床。机床参数和PLC梯形图用386型笔记本电脑从RS232C口输入 和输出。 相似文献
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内锥面刃磨麻花钻工艺试验研究 总被引:2,自引:1,他引:2
阐述内锥面刃磨麻花钻原理及在工具磨床上进行磨削工艺试验的方法和机床的调整.通过磨削工艺试验,刃磨出合格的麻花钻,并分析和研究试验中存在的砂轮不锋利、磨削效率低、钻头发热大、易烧伤等问题 相似文献
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介绍了M5M万能工具磨床改造前存在的问题及其原因,提出了具体的技术改造方案,对工件头架、尾座、砂轮轴的结构进行改进,改造后取得了理想的效果. 相似文献
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P. S. Pa 《Journal of Mechanical Science and Technology》2008,22(11):2197-2202
A newly designed finishing process utilizing an effective electrode and a grinding tool to execute the continuous electrochemical
finishing and grinding processes following turning is described in this paper. The proposed process can be used for a variety
of turning operations. Electrochemical finishing and grinding can be performed following the finishing process on the same
machine by using a simple attachment. The factors affecting electrochemical finishing, grinding performance, and electrochemical
finishing are discussed. The electrode was tested with both continuous and pulsed direct current. A higher work piece rotational
speed produced a better finish. Changing the electrode design from a semicircle to a wedge form with a small end radius caused
the electrolytic products and heat to dissipate more rapidly and provided the best finishing. Pulsed direct current finishing
was slightly better than using continuous direct current finishing. However, the use of pulsed current would increase machining
time and cost.
This paper was recommended for publication in revised form by Associate Editor Dae-Eun Kim
Dr. P.S. Pa obtained his doctorate at National Tsing Hua University, Taiwan. Presently he is an Associate Professor at Graduate School
of Toy and Game Design of National Taipei University of Education. His fields of interest are innovative design and manufacturing
processes. His current research includes ECM process for mould and die materials, precision finishing, toy design, and electro-optical
engineering. 相似文献
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利用SN弹性砂轮和数控机床特性,可将车磨抛工艺集合于一身,而且加工精度高。在磨削,抛磨加工中采用特殊数控循环程序,保证了工件精度。 相似文献