共查询到19条相似文献,搜索用时 140 毫秒
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双转台五轴数控机床误差实时补偿 总被引:7,自引:1,他引:7
以双转台五轴数控机床为对象,建立各移动轴和旋转轴运动的数学模型,以工件坐标系为基础坐标系,应用齐次坐标系变换理论,推导任一时刻各轴运动在工件坐标系中的位置误差数学表达式.针对五轴机床的移动轴和旋转轴同时运动存在耦合的情况,提出一种分步实施的解耦补偿方法,即在实施误差补偿时首先进行姿态误差补偿,通过旋转轴的旋转运动将工件的实际姿态调整到与理想姿态相同,然后通过移动轴的平移运动进行位置误差补偿,并相应建立五轴机床误差补偿数学模型.通过仿真分析和对曲面零件的实时补偿加工试验,明显提高加工精度,并有效避免直接进行补偿加工过程中可能带来的运动干涉情况,从而验证该五轴机床误差补偿数学模型及其实时补偿的可行性和有效性. 相似文献
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数控机床进给轴位置精度对加工精度具有重要影响。通过使用雷尼绍XL-80型激光干涉仪测量某型数控车床X、Z轴的定位误差数据,利用软件分析得到反向间隙补偿值和螺距误差补偿值,并在西门子840D sl数控系统中进行反向间隙补偿和螺距误差补偿;两进给轴误差补偿前后位置精度的实际测量结果表明,其定位精度和重复定位精度得到了显著的提高。 相似文献
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从机床的精度与误差、精度标准、几何误差分析等方面论述了机床误差形成的机理,讨论了机床静态几何精度、误差模型的建立以及误差的测量和补偿方法,提出了机床静态精度设计的基本原则,并对激光干涉、激光跟踪、球杆仪等新型测量方法和手段在多轴空间误差测量、回转轴误差测量等方面的应用进行了介绍. 相似文献
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为提高数控机床定位精度,需对精度的误差源进行分析及补偿。基于线性回归理论,采用激光干涉仪为检测工具,建立了BF-850B数控机床数据检测的精度检测与补偿模型,并根据各个测量点位误差特性进行分析,确定采用一次性线性补偿和多段式线性补偿方法;最后,结合具体的数控机床实例,根据得到的实验数据验证实现误差补偿,对定位精度的补偿效果进行了分析。结果表明:一次性线性补偿将X轴精度由4.853 1~35.025 0μm提高至-2.472 1~0.736 3μm;将Y轴精度由-14.425 0~-4.132 5μm提高至-2.481 2~0.752 9μm;将Z轴精度由-4.128 0~17.227 1μm提高至-0.501 5~1.324 5μm;多段式线性补偿将X轴精度提高至-1.364 1~0.484 0μm;将Y轴精度提高至-1.364 1~0.551 0μm;将Z轴精度提高至-0.412 0~0.495 2μm;补偿前根据数据分布的主要特点,采用呈线性或分段式对数控机床的系统误差进行相应的呈线性或分段式补偿有着很好的补偿效果。 相似文献
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为了降低数控机床几何误差,提升加工精度,提出机械制造业数控机床几何误差自动控制方法。通过激光跟踪仪辨识机械制造业数控机床的几何误差,采用快速定位补偿算法与圆弧插补补偿算法相结合的方法补偿数控机床几何误差。利用计算机辅助制造软件生成刀位文件,依据刀位文件生成数控机床加工程序,通过补偿控制器生成数控机床各轴运动的控制指令,数控机床伺服系统接收控制指令后,自动控制数控机床各轴运动,以达到数控机床几何误差自动控制的目的。实验结果表明,采用该方法自动控制数控机床几何误差后,方向与角度的几何误差分别低于0.03 mm与0.1°,实际应用效果较好。 相似文献
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FANUC数控机床螺距误差的检测分析与应用 总被引:2,自引:0,他引:2
Fanuc数控机床在我国数控加工领域占据着主导地位,它的精度和性能指标直接取决于数控机床的定位精度和重复定位精度。在实践应用中,数控系统的螺距误差补偿功能是最节约成本且直接有效的方法。利用激光干涉仪或步距规测得的实际位置与数控机床移动轴的指令位置相比较,计算出全程上的误差分布曲线,在数控系统控制移动轴运动时考虑该误差差值并加以补偿,可以使数控机床的精度达到更高水平。 相似文献
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At present, the detection of rotary axis is a difficult problem in the errors measurement of NC machine tool. In the paper, a method with laser tracker on the basis of multi-station and time-sharing measurement principle is proposed, and this method can rapidly and accurately detect the rotary axis. Taking the turntable measurement for example, the motion of turntable is measured by laser tracker at different base stations. The redundant equations can be established based on the large amount of measured data concerning the distance or distance variation between measuring point and base station. The coordinates of each measuring point during turntable rotation can be accurately determined by solving the equations with least square method. Then according to the error model of rotary axis, the motion error equations of each measuring point can be established, and each error of turntable can be identified. The algorithm of multi-station and time-sharing measurement is derived, and the error separation algorithm is also deduced and proved feasible by simulations. Results of experiment show that a laser tracker completes the accuracy detection of the turntable of gear grinding machine within 3 h, and each error of the turntable are identified. The simulations and experiments have verified the feasibility and accuracy of this method, and the method can satisfy the rapid and accurate detecting requirements for rotary axis of multi-axis NC machine tool. 相似文献
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Quick and accurate detecting the error of NC machine tool and performing the error compensation are important to improve the machining accuracy of NC machine tool.Currently,there are many methods for detecting the geometric accuracy of NC machine tool.However,these methods have deficiencies in detection efficiency and accuracy as well as in versatility.In the paper,a method with laser tracker based on the multi-station and time-sharing measurement principle is proposed,and this method can rapidly and accurately detect the geometric accuracy of NC machine tool.The machine tool is controlled to move in the preset path in a 3D space or 2D plane,and a laser tracker is used to measure the same motion trajectory of the machine tool successively at different base stations.The original algorithm for multi-station and time-sharing measurement is improved.The space coordinates of the measuring point obtained by the laser tracker are taken as parameter values,and the initial position of each base point can be determined.The redundant equation concerning the base point calibration can be established by the distance information of the laser tracker,and the position of each base point is further determined by solving the equation with least squares method,then the space coordinates of each measuring point can be calibrated.The singular matrix does not occur in calculation with the improved algorithm,which overcomes the limitations of the original algorithm,that the motion trajectory of machine tool is in a 3D space and there exits height difference between the base stations.Adopting the improved algorithm can expand the application of multi-station and time-sharing measurement,and can meet the quick and accurate detecting requirements for different types of NC machine tool. 相似文献
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The linear and rotary axes are fundamental parts of multi-axis machine tools. The geometric error components of the axes must be measured for motion error compensation to improve the accuracy of the machine tools. In this paper, a simple method named the three-point method is proposed to measure the geometric error of the linear and rotary axes of the machine tools using a laser tracker. A sequential multilateration method, where uncertainty is verified through simulation, is applied to measure the 3D coordinates. Three non-collinear points fixed on the stage of each axis are selected. The coordinates of these points are simultaneously measured using a laser tracker to obtain their volumetric errors by comparing these coordinates with ideal values. Numerous equations can be established using the geometric error models of each axis. The geometric error components can be obtained by solving these equations. The validity of the proposed method is verified through a series of experiments. The results indicate that the proposed method can measure the geometric error of the axes to compensate for the errors in multi-axis machine tools. 相似文献
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为了提升五轴数控机床各旋转轴精度,解决旋转轴几何误差难以测量的问题,提出了一种基于激光干涉仪的旋转轴几何精度快速测量方法。该方法针对AC双转台和BC摆头转台的结构特性,采用旋转轴与直线轴联动的测量技术,可以避免传统测量方法对旋转轴中心的依赖性,推导了测量中直线轴转角误差与直线度对旋转轴几何误差约束关系,在保证精度的同时减少了测量过程中的设备安装调试时间,实现了五轴机床旋转轴转角误差、重复转角误差以及反向间隙的快速测量和补偿。对实际五轴机床AC双转台几何精度进行检定,提高了旋转轴的几何精度,实验证明该测量方法具有很强的工程应用价值。 相似文献