共查询到20条相似文献,搜索用时 109 毫秒
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提出非正交位置两传感器在线测量主轴回转精度的误差分离技术理论,可同时获得主轴回转误差和工件圆度误差的测量结果。本方法虽然存在原理误差,但具体实施时却有传感器调整容易、测试系统简单、成本低廉和便于测量等诸多优点。较现行三传感器更具有实用性、同时讨论了实际测量保证误差分离精度注意的几个问题。 相似文献
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本文给出了机床主轴回转误差计算机辅助测试系统。该系统与传统测量系统相比具有测量精度高。数据处理能力强,操作方便等特点。 相似文献
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车床主轴回转精度的测量是一项重要的测试课题。针对传统的测量方法需要使用基圆发生器,数据处理困难,测试结果难以在各车床间进行比较等问题,提出了利用数字式单向测量法对车床主轴回转误差进行动态测量。从分析回转误差的测试原理和误差性质出发,建立起回转误差的数学模型,利用信号分析的手段分离出基准球安装偏心误差,并通过计算机仿真对该数学模型及分离方法进行验证和分析。实验结果表明,采用本文的方法对C616主轴回转精度进行测量,其测量结果与DJ-HZ-1型机床回转精度测量分析仪的测量结果基本吻合。 相似文献
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李艳平 《机械工人(冷加工)》2010,(10):53-54
1.机械加工产生误差的主要原因(1)主轴回转误差主轴回转误差是指主轴各瞬间的实际回转轴线相对其平均回转轴线的变动量。产生主轴径向回转误差的主要原因有:主轴几段轴颈的同轴度误差、轴承本身的各种误差、轴承之间的同轴度误差和主轴挠度等。适当提高主轴及箱体的制造精度,选用高精度的轴承,提高主轴部件的装配精度,对高速主轴部件进行平衡,对滚动轴承进行预紧等,均可提高机床主轴的回转精度。 相似文献
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简要介绍了机床主轴回转误差的概念及基本形式,分析了主轴回转误差对零件加工精度的影响.并结合生产、教学实际,对提高加工精度提出一些看法. 相似文献
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与工件圆度的误差评价相比,实现对不具有单圈重复性的主轴回转精度的评价较为困难.在分析主轴轴线定义及理想轴心可观测性的基础上,建立单圈非重复性主轴回转精度评价的数学模型,针对该数学模型,进行主轴回转误差的集合转换,使得转换后的集合能够适应于计算机处理的误差评价方法.然后利用极差极小化的原理,建立最小区域法的误差评定统一准则和作用表面的统一判别准则.利用这两个评判准则,可以顺利实现对主轴回转误差的最小区域法评价、最小外切圆法评价和最大内接圆法评价,从而提高单圈非重复性主轴回转误差的评价精度,同时也提高误差评价的效率. 相似文献
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Ping Ma Chunming Zhao Xinhui Lu Chenglong Gong Xing Niu 《The International Journal of Advanced Manufacturing Technology》2014,73(9-12):1313-1320
The hydrostatic spindle is widely applied in the field of high-precision machine tools, which has some advantages such as high stiffness, high rotary precision, and the high damping shock absorption. The spindle rotation error is an important index to measure the machining accuracy of machine tools. Due to the installing eccentric error of the test bar, conventional method based on the standard test bar to measure the rotation error indirectly is applied to the precision machine tools and common machine tools whose rotation error is greater than 1 μm only. In order to eliminate the installing eccentric error of the standard test bar, it presents a self-reference approach that takes the online finish turning test bar, rather than that of the standard test bar, as the measuring datum. Using the capacitive micro-displacement sensor and the LMS data acquisition equipment as the test platform, it designs a set of spindle rotation error measurement system. Then it studies the frequency domain three-point method and has the rotation error and roundness error of high-precision hydrostatic spindle separated. Experimental study shows that the rotation error and the roundness error of the spindle are 0.9 and 0.3 μm, respectively, under the circumstance of conventional standard test bar as the measuring datum. However, if it takes the online finish turning test bar as the measuring datum, the rotation error and the roundness error of the spindle are only 0.3 and 0.1 μm, respectively. The self-reference method is able to eliminate the installing eccentric error of standard test bar directly, and the measurement system has realized the accurate measurements of the rotation error and roundness error of the high-precision hydrostatic spindle. 相似文献
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Reducing the manufacturing time is the trend of high-precision manufacturing, and the precision of a work-piece is very important for manufacturing industry. The high-speed motorized spindle is the most critical part and becoming more widely used in the machine tool at present, and its precision may affect the overall performance of high-speed cutting. Most of the studies on high-speed cutting are focused on the cutting force, the vibration of the spindle and effects of the spindle’s thermal deformations; hence, how to roundly measure and objectively evaluate high-speed spindle is an imminence question of it because the comprehensive dynamic properties and evaluation system of spindles directly affect the cutting ability of the whole machine tool before they are manufactured. This paper presents a comprehensive measurement and evaluation system of high-speed motorized spindle, which reflects the overall performance of motorized spindle and bases on international standard. 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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大规格数控成形磨齿机高速电主轴系统在加工过程中产生大量热量,导致砂轮主轴产生相应热变形,影响加工精度。针对这一现象,提出了一种考虑接触热阻的瞬态热-结构耦合分析方法。该方法基于分形理论,利用W-M分形函数表征结合面接触状态,使用均方根测度法对分形参数进行识别。结合基体热阻和收缩热阻的影响计算结合面间总接触热阻,并计算热源发热量及各部件的对流换热系数,建立了综合考虑内部热源、边界条件和接触热阻的综合有限元模型,获得热误差仿真结果。分析电主轴温度及热变形在是否考虑接触热阻情况下变化差异。最后建立电主轴系统热误差测量试验平台,通过试验验证了该方法的准确性和可靠性。通过仿真得到温度及热位移量与实验值基本一致。 相似文献
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Nguyen Ngoc Nam Boc Minh Hung Pham Dinh Tung Hwan-Seong Kim 《Machining Science and Technology》2013,17(6):985-1002
AbstractThis paper aims to analyze the dynamic stability and build the robust controller for motorized spindle system under parametric variations, external disturbances and measurement noises. A nonlinear model has been established for the machine tool spindles. The phase portrait and bifurcation analyses are provided to show dynamical behaviors for spindle machining. The spindle operations can be dynamically stables or unstable under parameter variations and disturbances. By using the robust control synthesis, the system designers can shape the frequency responses of the desired model which satisfies both transient response and robustness against various uncertainties. In fact, the robust controller can effectively attenuate exogenous disturbances and sensor noises during machining process. Finally, the simulations results demonstrate that the presented controller provides robust stability for the spindle speeds, along with excellent abilities of noise as well as disturbance attenuations. 相似文献
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Thermal error of a hydrostatic spindle 总被引:3,自引:0,他引:3
This paper proposes a thermo-mechanical error model of a hydrostatic spindle for a high precision machine tool. By predicting the variation of motion error induced by thermal effects on a machine worktable during machining, this model allows deeper insights into the underlying mechanisms that result in evolutions of the spindle accuracy. The heat power generated in the spindle elements and the coefficients of convection heat transfer over its outer surface have been evaluated. Then, the distribution of temperature and deformation of the spindle have been simulated by a finite element coupled thermo-elastic model, from which the influence on notably spindle stiffness variation was deduced. Experimental measurement of the thrust plate axial displacement under thermal expansion is in close agreement with the computed axial thermal expansion. 相似文献
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A review on the preload technology of the rolling bearing for the spindle of machine tools 总被引:3,自引:0,他引:3
Young-Kug Hwang Choon-Man Lee 《International Journal of Precision Engineering and Manufacturing》2010,11(3):491-498
The performance of the spindle system and bearings in a machine tool is largely influenced by the preload applied to bearings.
Therefore, it is a very important issue to determine a proper preload in bearings and apply it to bearings for satisfying
the performance required in bearings according to its operation conditions. This study performed a review on the preload technologies
through classifying these technologies into three categories; a preload configuration technology that properly determines
the preload for optimizing the performance of bearings, a preload application technology that applies the determined preload
to bearings during the operation of a spindle system as a reliable way, and a preload measurement technology that verifies
the preload applied to an actual spindle system. 相似文献