Vertical projection measuring method for male thread and its application analysis
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摘要: 为了实现外螺纹的高效测量,采用理论分析与实验验证对垂直投影测量方法进行了研究。解释了垂直投影测量法在外螺纹牙形测量过程中出现的牙形失真现象,分析了牙形失真现象的产生原因和发生条件,分别给出了普通三角螺纹和梯形螺纹牙形失真发生条件,证明了采用垂直测量法进行普通三角螺纹测量不会发生牙形失真现象,而梯形螺纹会发生牙形失真。通过用工具显微镜和影像测量仪对普通三角螺纹与梯形螺纹测量数据进行了对比。结果表明,普通三角螺纹和管螺纹可适用垂直投影测量方法测量,而梯形螺纹采用该方法测量会有较大的测量误差。这一结果对利用垂直投影测量方法实现外螺纹高效测量是有帮助的。Abstract: In order to measure male thread efficiently,vertical projection measurement method was studied in theory and experiment.The reason and conditions for the distortion of thread profiles in process of measuring profile angles was explained taking tri-angular thread and acme thread as examples.It is proved in principle that thread profile distortion cannot occur in measuring tri-angular thread profiles with vertical projection measuring method,while it does for acme thread.After comparing the measurement data of tri-angular thread and acme thread that measured with tool microscope and image instrument respectively,it shows that tri-angular and pipe thread can be measured properly with vertical projection measurement,and it can bring about big error for acme thread measurement.The result is helpful to measure male thread efficiently with vertical projection measurement.
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