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机械加工中主轴运动影响的数学分析 总被引:2,自引:0,他引:2
以车床和镗床主轴为例,从数学几何角度对主轴运动误差的加工精度影响进行了定量分析,并推导了由此产生的各类加工误差的数学表达式。 相似文献
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本文对机床主轴回转精度的一些基础理论问题(如主轴误差运动的数学描述、误差运动的频率分析、误差运动各次频率分量对加工的影响等)进行了数学推导和理论分析。对于进一步研究主轴回转精度的各种具体的测试方法,特别是测试数据的处理方法,这些内容可提供理论性的依据。文章还论述了目前广泛使用的圆图象法存在的问题,并介绍了直角座标法的基本原理。 相似文献
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主轴回转误差是影响机床加工的几何精度和表面光洁度的重要因素之一。因此对其分析和研究日益引起人们的重视。本文就主轴回转误差的基本概念、误差测量、评定方法以及各种因素对测量结果的影响和消除方法作了综合性的介绍 相似文献
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一、概述在理想的情况下,机床主轴回转轴线在空间的位置是固定不变的。但是实际上,由于存在着轴承的轴颈加工误差,存在着回转过程中的静力学和动力学等方面的影响,主轴的回转轴线在空间的位置是不断变化的。这一变化直接反映到加工零件的形状精度和表面光洁度。因此机床主轴的回转精度是评定机床精加工性能的一项极重要的依据。为了测得这一运动误差,我们研制了主轴回转精度测量系统。该系统包括:主轴回转精度测量仪、数据处理装置和记录仪三部分。系统的测量方法见图1。 相似文献
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以普通车床主轴为例,从数学几何角度对主轴纯角度摆动时的加工精度进行了定量分析,推导出不同摆动频率时加工误差的数学表达式,且用MATLAB仿真出其加工截面图形,并计算和分析了不同摆频下加工后工件的圆度误差。 相似文献
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本文对主轴回转误差运动的分类及其数学描述进行了较详细的介绍。并采用圆矢量函数方法分析了主轴回转误差运动对齿轮加工精度的影响。 相似文献
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针对机床主轴回转误差对零件加工质量可能造成的影响,介绍了各种摆脱和减少机床主轴回转误差可采取的技术措施。 相似文献
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在机械加工中,机床主轴的回转精度对加工精度的影响是很重要的。当车床主轴具有纯角度摆动时,在文献[1][2][3][4][5]认为加工后工件有锥度产生。本文对此提出不同看法。运用把工件不同截面上因主轴纯角度摆动引起的误差相比较,得出了在此情况下工件将产生斜圆柱形误差的结论。 相似文献
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S. Denis Ashok G. L. Samuel 《The International Journal of Advanced Manufacturing Technology》2012,59(5-8):445-461
Miniaturized machine tools have been established as a promising technology for machining the miniature components in wider range of materials. Spindle of a miniaturized machine tool needs to provide extremely high rotational speed, while maintaining the accuracy. In this work, a capacitive sensor-based measurement technique is followed for assessing radial errors of a miniaturized machine tool spindle. Accuracy of spindle error measurement is affected by inherent error sources such as sensor offset, thermal drift of spindle, centering error, and form error of the target surface installed in the spindle. In the present work, a model-based curve-fitting method is proposed for accurate interpretation and analysis of spindle error measurement data in time domain. Experimental results of the proposed method are presented and compared with the commonly followed discrete Fourier transform-based frequency domain-filtering method. Proposed method provides higher resolution for the estimation of fundamental frequency of spindle error data. Synchronous and asynchronous radial error values are evaluated in accordance with ANSI/ASME B89.3.4M [9] standard at various spindle speeds and number of spindle revolutions. It is found that the spindle speed and number of spindle revolutions does not have much influence on synchronous radial error of the spindle. On the other hand, asynchronous radial error motion exhibits a significant speed-dependant behavior with respect to the number of spindle revolutions. 相似文献
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热误差建模和补偿是提高机床加工精度的重要手段。 将得到的热误差模型应用到类似或相近任务中,对减少模型构建
和数据收集的成本具有重要意义。 本文提出了一种简易迁移学习(EasyTL)融合域内对齐的主轴热误差建模方法,以实现不同
工况下误差模型的迁移复用。 建立基于域内对齐和距离矩阵全组合择优的热误差迁移模型参数选取方法,获得最优组合。 进
一步分析不同类型的域内对齐和距离矩阵各自对模型迁移性能的影响。 最后,将迁移模型与 kNN 典型机器学习模型和卷积神
经网络深度模型进行比较验证,分别预测不同工况下主轴 Z 向和 Y 向的热误差。 此外,根据预测的主轴热误差进行工件补偿
加工实验。 该方法为热误差建模及补偿提供了一种新思路。 相似文献
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为研究数控机床热变形规律,实现数控机床误差在机实时补偿,进行数控机床主轴热变形理论及试验分析,结果表明,数控机床主轴热变形与主轴温变在距热源约1/3位置存在近似线性关系,即主轴热变形存在伪滞后现象,这一结果为数控机床测温点优化布置及热误差鲁棒建模提供理论依据。为验证机床热变形伪滞后现象,对VM850加工中心主轴热漂移误差在机实时检测并建模,通过自主研发数控机床误差在线实时补偿系统对主轴热漂移误差进行实时补偿,经补偿,机床主轴热漂移误差减少90%以上,有效提高了数控机床主轴精度。 相似文献
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一种圆柱度测量基准的误差分离方法 总被引:4,自引:0,他引:4
通过对主轴回转误差运动的分析,结合三点法圆度误差分离技术,提出了一种完全分离圆柱度测量基准误差的分离方法,即利用主轴回转轴线平均线、测量传感器及直行导轨之间的空间位置关系,建立相应的坐标系,在分离出被测截面圆度误差、最小二乘圆心初始坐标的基础上,完整地分离出影响圆柱度精密测量的径向回转运动误差和导轨的直行运动误差。该技术不仅可以消除测量基准误差对圆柱度测量精度的影响,还可以实现主轴回转误差、导轨直线度以及导轨对主轴平行度误差的精密测量,对高精度误差补偿加工和机床的精度检验也具有重要意义。 相似文献
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Dr Jenq-Shyong Chen 《The International Journal of Advanced Manufacturing Technology》1996,12(4):303-308
This research is concerned with enhancing the accuracy of a machining centre by compensating for thermally induced spindle errors in real-time. A neural network model was developed for on-line thermal error monitoring. A PC-based error compensation scheme was also developed to upgrade a commercial CNC controller for real-time thermal error compensation without any hardware modifications to the machine. The spindle thermal errors of a vertical machining centre were reduced by 70% after compensation. 相似文献
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The fast tool servo (FTS) machining process provides an indispensable solution for machining optical microstructures with sub-micrometer form accuracy and a nanometric surface finish without the need for any subsequent post processing. The error motions in the FTS machining play an important role in the material removal process and surface generation. However, these issues have received relatively little attention. This paper presents a theoretical and experimental analysis of the effect of error motions on surface generation in FTS machining. This is accomplished by the establishment of a model-based simulation system for FTS machining, which is composed of a surface generation model, a tool path generator, and an error model. The major components of the error model include the stroke error of the FTS, the error motion of the machine slide in the feed direction, and the axial motion error of the main spindle. The form error due to the stroke error can be extracted empirically by regional analysis, the slide motion error and the axial motion error of the spindle are obtained by a kinematic model and the analysis of the profile in the circumferential direction in single point diamond turning (SPDT) of a flat surface, respectively. After incorporating the error model in the surface generation model, the model-based simulation system is capable of predicting the surface generation in FTS machining. A series of cutting tests were conducted. The predicted results were compared with the measured results, and hence the performance of the model-based simulation system was verified. The proposed research is helpful for the analysis and diagnosis of motion errors on the surface generation in the FTS machining process, and throws some light on the corresponding compensation and optimization solutions to improve the machining quality. 相似文献