The process of a pipe production is the following: a round cast workpiece is put onto a hot rolling line where it is cut, heated, stitched and rolled till a pipe of necessary size is ready.

一个钢管的生产流程如下：圆管坯放在要被切割的高温轧制线上，继续升温，穿孔，轧制直到管坯大小基本成型。

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In order to measure the cylindricity error of the pipe which is in the internal part of a workpiece, this paper studies a cylindricity error evaluation method based on industrial CT images.

针对工件内部管道圆柱度误差测量的问题，研究了一种基于工业CT图像的圆柱度误差测量方法。

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For a workpiece used in expanding the beginning of plastic pipe, We analyse the machining process, workpiece rectifying before machining, and design WEDM processing and its program.

针对扩口器工件的特点进行了线切割加工工艺分析、工件校正及编程设计；

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