使用的刀具外形必须正好与要切削螺纹的轮廓一致，即三角形刀具必须用于三角形螺纹等等。
The form of the tool used must exactly coincide with the profile of the thread to be cut, i. e. , triangular tools must be used for triangular threads, and so on.
在获取螺纹图像的基础上，通过边缘检测算法获取螺纹轴剖面外轮廓的边缘。
On the basis of thread image acquisition, the edge of axial-section contour threads was obtained through using the edge detection algorithm.
本文介绍了利用计算机图象系统对具有复杂轮廓的热轧螺纹钢进行在线检测的技术。
This paper introduces the on line measurement technique based on computer image system for hot bamboo steel with high speed and high temperature.
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