CAJ | 학술논문

为了提高机器视觉方法测量螺纹的精度，采用理论分析和实验验证的方法，研究了用垂直投影测量和切向投影测量方法进行螺纹测量时发生的延伸螺旋面投影遮挡问题。在介绍垂直投影测量和切向投影测量方法的基础上，解释了垂直投影测量和切向投影测量方法产生原理误差的原因。通过对遮挡误差和不同螺旋升角误差对螺纹牙形角测量影响情况的理论分析和推导，给出了垂直投影测量时延伸螺旋面遮挡和不同螺旋升角影响的误差计算式，并进行了实例验证和分析。结果表明，对导程较大的螺纹按垂直投影法测量时，由延伸螺旋面遮挡造成的牙形角测量误差可达到1°以上。这一结果对牙形角测量而言是不容忽视的。
위료제고궤기시각방법측량라문적정도，채용이론분석화실험험증적방법，연구료용수직투영측량화절향투영측량방법진행라문측량시발생적연신라선면투영차당문제。재개소수직투영측량화절향투영측량방법적기출상，해석료수직투영측량화절향투영측량방법산생원리오차적원인。통과대차당오차화불동라선승각오차대라문아형각측량영향정황적이론분석화추도，급출료수직투영측량시연신라선면차당화불동라선승각영향적오차계산식，병진행료실례험증화분석。결과표명，대도정교대적라문안수직투영법측량시，유연신라선면차당조성적아형각측량오차가체도1°이상。저일결과대아형각측량이언시불용홀시적。
In order to improve measuring precision of thread based on machine vision,tangential and vertical projection measuring methods were discussed in theory,and verified experimentally,mainly related to the matter of extending helicoidal surface shade error when measuring thread profile with both the methods.After introducing the tangential and vertical projection measurement methods,the error sources were analyzed which cause principle error in measuring thread.The shade error calculating formula was given that caused from measuring thread with vertical projection measurement,and the effect that the shade error and the error caused by different lead angle was studied in measuring thread profile experiments.The result shows that the helix angle measurement error caused by extend helicoids shade error can reached over 1 °when measuring larger-size helical pitch by vertical projection measurement,it can’t be ignored for helix angle measurement.