Accuracy prediction of workpieces considering machine errors of multi-axis machine tools and its identification

考虑多轴机床加工误差的工件精度预测及其识别

基本信息

批准号：
17360059
负责人：
TSUTSUMI Masaomi
金额：
$ 8.32万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

In this research work, the influence of machine errors such as the pitch error of worm-gears and the servo-error of NC controller for five-axis machining centers, which are a typical multi-axis machine tool, is investigated by the computer simulation and experiment. Firstly, the effectiveness of the testing method defined by the clause K6 of ISO 10791-6, which is specified for the five-axis machining centers with a double pivot spindle head, is investigated. It is pointed out from our results that the specified testing method in the ISO standard does not give any useful data. An alternative testing method is proposed, and its method gives us some useful information relating to the geometric accuracy. Then, an alternative measuring instrument of the motion trajectory of five-axis machining centers with a tilting rotary table is also developed. The developed instrument is very simple.A new testing method for checking the synchronous accuracy of a linear axis and a rotary axis is proposed. In the proposed method, a linear axis is simultaneously controlled with a rotary axis, and a circular path is described by the two axes. It is found that the proposed method is useful to check the servo-delay of each axis. Finally, the behavior of the simultaneous five-axis motion is investigated, considering the pitch error of the work gear and servo-delay as well as the geometric deviations. It is pointed out that the inclination angle and the center offset of the three dimensional circular path governs the dynamic behavior of the five controlled axes. In addition, it is found that the backlash and pitch error of the worm gear largely affect to the finishing accuracy of the workpiece of which shape is cone frustum.

在这项研究工作中，通过计算机仿真研究了五轴加工中心（一种典型的多轴机床）的蜗轮节距误差和数控控制器伺服误差等机床误差的影响。和实验。首先，研究了 ISO 10791-6 的 K6 条款定义的测试方法的有效性，该测试方法针对具有双枢轴主轴头的五轴加工中心进行了规定。我们的结果指出，ISO标准中规定的测试方法没有给出任何有用的数据。提出了一种替代测试方法，该方法为我们提供了一些与几何精度相关的有用信息。然后，还开发了一种可倾斜转台五轴加工中心运动轨迹的替代测量仪。所开发的仪器非常简单。提出了一种检查直线轴和旋转轴同步精度的新测试方法。在所提出的方法中，线性轴与旋转轴同时控制，并且由两个轴描述圆形路径。结果发现，所提出的方法对于检查每个轴的伺服延迟很有用。最后，考虑工作齿轮的节距误差和伺服延迟以及几何偏差，研究同时五轴运动的行为。指出三维圆形路径的倾角和中心偏移控制着五个受控轴的动态行为。此外，还发现蜗轮的齿隙和螺距误差对截头锥体工件的精加工精度影响较大。