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A/C轴双轴转台是中、小规格五轴联动加工中心的核心功能部件。分析了A轴、C轴与工作台台面之间的五项几何误差,利用激光干涉仪与RX10回转基准分度器对A轴、C轴的分度误差进行检测与补偿,利用五轴数控系统对A轴轴线与C轴轴线之间的位置误差、A轴轴线与工作台台面之间的尺寸误差进行检测与补偿,并提出了一种即节省成本又能有效降低A轴轴线与C轴轴线之间角度误差的修正方法。 相似文献
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A/C轴双摆角铣头C轴轴线、A轴轴线与主轴轴线之间存在3个位置误差与3个角度误差,6个几何误差严重影响曲面零件的加工精度.通过百分表以及海德汉iTNC530数控系统可以补偿3个位置误差,而3个角度误差只能依靠提高零部件加工精度或采取若干调整措施才能予以解决. 相似文献
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基于多体系统理论,建立了三轴数控铣床误差补偿模型,运用RENISHAW ML10激光干涉仪对VMC-860型三轴数控铣床几何误差进行测量,并运用Visual C++.NET工具开发出误差补偿软件.最后采用试切法进行误差补偿试验,并通过MISTRAL 070705型三坐标测量仪测量,验证了数控铣床几何误差软件补偿的可行性及有效性. 相似文献
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一种五轴数控机床的综合误差建模与补偿 总被引:1,自引:0,他引:1
研究五轴数控机床的综合误差建模与补偿方法。系统地分析了机床几何误差与热误差,并提出了其新的分类方法和一种直观形象的杆、副误差矩阵描述方法,根据这种误差描述方法建立了五轴数控机床的综合误差模型,最后根据矩阵微分法建立了机床综合误差补偿模型。 相似文献
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In this paper, an on-machine error calibration method, covering error modeling and measurement, is proposed to evaluate and compensate the errors caused by the mechanical and optical system equipped in the micromachining center using the femtosecond laser. Through preliminary tests by dicing silicon wafer, it has revealed that the squareness, laser beam misalign and focal position offset, are the main causes to result in the inaccuracy of micromachining. Consequently, an error modeling method is proposed to evaluate the error distribution in the workspace, and hereafter a comprehensive error vector of the laser beam, combining the squareness errors of Z-axis with the laser beam misalign, is generated by the variable substitution method. Subsequently, an increment error model in the instant local coordinates is established to satisfy the requirement of the programming method commonly used in the laser machine tools. Furthermore, a series of holes and grooves are machined on the femtosecond laser micromachining center to validate the proposed approach and model. The machining dimensions including diameters, distances and angles, are measured on-machine to identify the squareness errors, laser beam misalign and focal position offset according to the proposed error model. Finally, the experimental results show that, comparing to the uncompensated tests, the machining accuracy has been significantly improved with the proposed method. 相似文献
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A new model using approximate formulas is established to predict the error motions of hydrostatic thrust bearings. Three different types of geometric errors of thrust plates are listed in this paper including tilt errors, saddle shaped errors and petal shaped errors. The influences of them on lateral tilt error motion, longitudinal tilt error motion and axial error motion are discussed. Definitions of averaging coefficients are made based on the approximate formulas. It is found that the time-varying tilt errors are the main reason for the error motions of hydrostatic thrust bearings. The thrust bearings with six pairs of recesses have priority over the thrust bearings with four and three pairs of recesses in the view of rotation accuracy. Experiments are done using a hydrostatic rotary table with an outer diameter of 2 m. It is found that the second harmonic errors are the main component of the radial run-out and the results agree well with the results calculated from the approximate formulas. 相似文献
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Dr J. C. Liang H. F. Li J. X. Yuan J. Ni 《The International Journal of Advanced Manufacturing Technology》1997,13(10):708-712
A comprehensive error compensation system has been developed to correct geometric, thermal, and cutting force-induced errors on a turning centre. The basic approach to error compensation is proposed in this paper. The implementation of error compensation control and of hardware configuration of the system are also presented. A total of 11 geometric and thermal error components and 10 cutting force-induced error components can be compensated for using this system. Performance evaluations have been carried out using actual cutting tests. Experimental results show that the diameter accuracy of the part has been improved more than 5 times and taper accuracy of the part has been improved about 5 times. 相似文献
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数控机床误差补偿技术及应用——几何误差补偿技术 总被引:13,自引:2,他引:11
利用多体系统运动学理论,通过分析低序体阵列、变换矩阵和运动方程,在相邻体之间引入位置误差和位移误差,建立了机床空间定位误差通用计算模型。基于激光测量提出机床的21项几何误差参数辨识模型。在XH715加工中心上,对机床的空间几何误差进行理论计算,并进行补偿前后的对比实验,结果表明机床空间定位误差减小50%以上,同时也表明利用误差补偿技术提高机床加工精度是有效的。 相似文献
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几何对象的不精确以及计算机浮点运算生成的误差积累,势必会影响几何算法的可靠性。仅靠盲目提高各数据精度来确保几何算法可靠性的方法是不可取的。本文提出了一种根据所求的几何表示误差确定几何算法中计算精度的方法,人们可通过该方法选取适当的计算精度,从而避免了因对精度要求过高而做的多余工作。 相似文献
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双光子聚合加工技术可实现大面积超材料快速结构化加工,双光子聚合加工系统中存在的误差是影响加工精度的重要因素之一。系统误差的来源以及系统误差的辨识分析是实现误差补偿,提高加工精度的重要前提。为了研究加工系统的各个组成部分的误差项及系统误差的主要来源,对系统误差进行辨识分析,从而建立双光子聚合加工系统的误差模型,并搭建实验测量系统,对微动台的几何误差进行测量,包括定位误差与直线度误差,然后采用改进九线辨识法对其它几何参数进行辨识,得到了加工系统的各项几何误差参数。对加工系统的误差项及其主要来源分析,可知系统的几何误差对加工精度的影响最大,同时对其误差参数进行辨识,对提高加工精度有重要意义。 相似文献