基于精確計時的回轉(zhuǎn)射線簇角坐標建立方法研究
[Abstract]:In the field of high-end equipment manufacturing, there is a lack of automatic measurement methods for large-size parts, especially for internal-size parts. A high precision and automatic measurement method based on laser rotating ray cluster has been put forward by our research group, which has been proved to be feasible and effective by measurement experiments. After further study, it is found that the key to improve the measuring ability of the method is to obtain the angular coordinates corresponding to the measured values when using the laser rotating ray cluster measurement method. Based on the analysis of the existing measurement systems and the future prospect planning, the requirements of the method for obtaining angular coordinates for laser rotating ray clusters are proposed. Photoelectric encoder is a commonly used tool for obtaining angular coordinates. It requires the rotation of stator and rotor to achieve angle coordinate acquisition. It is difficult to provide this kind of relative rotation between stator and rotor by existing measuring system. Moreover, the photoelectric encoder will face the angle error caused by the coaxiality error of the installation, so the photoelectric encoder is not suitable to establish the angle coordinate for the laser rotating ray cluster. Other traditional angle measurement methods are often not suitable for the laser rotation ray cluster because of the complexity of measurement system and other reasons. The accurate timing method for angle coordinates is WMPS and time grating method. WMPS is an interactive transmitting and receiving system which needs cooperation target, but the system structure of time grid method is complex, and it still needs solid devices. Therefore, these two methods are not suitable for the establishment of angular coordinates for laser rotating ray clusters. In this paper, a new method based on precise timing for the establishment of angular coordinates of laser rotating ray clusters is proposed. In the case of no solid indexing element and no cooperative object, the angular displacement measurement is transformed into time measurement, and the measurement information is self-adjusted, and each displacement measurement value is given high precision angular coordinates by precise time interval measurement. According to this method, a measuring head with self-provided power supply and wireless data transmission capability can be installed on the spindle of machine tool. To verify the effectiveness of the method, two devices are designed as measuring objects: one is a workpiece with two dihedral angles, the other is a regular 28 side hole. The dihedral angle is measured with the help of the spindle of vertical milling machine. The experimental results show that the accuracy of the time measurement module and the uniformity of the spindle rotation meet the requirements. In addition, the dihedral angle measurement value is compared with the standard data obtained by the Hexkon CMM. The error of the dihedral angle measurement is 10? The relative measurement error is 0. 028. By comparing the measured value of the normal 28 side hole with the standard data of the 28 side hole measured by the image measuring instrument, the maximum measuring error of each side length fitting is less than 50 渭 m, and the maximum measuring error of the adjacent edge angle is less than 3 渭 m. The experimental results show the feasibility of this method.
【學位授予單位】:天津大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TH741
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