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本刊九卷二期所载的“管子的弯曲制造”一文,介绍了一些弯管的实际经验以及某些基本知识。无疑地它将引起弯管工作者们的注意,并吸取其中宝贵的经验以改进弯管技术。但在原文中对于芯子伸出长度叙述得不够全面,本着相互学习的精神,特对此问题提出如下的讨论。的确,芯子伸缩直接影响着管子的质量。太前了,管子会拉长,并使外缘的管壁剧烈减薄;太后了,就使变形系数增加,而当弯曲半径小时,可能在内缘产生摺痕(图一)。往往在碰到一种实际情况时,很难确定芯子伸出量的数值(或某一范围)究竟等于多少,此时就不得
The article “Curved Manufacturing of Tubes”, Volume II, Volume 9, introduces the practical experience and some basic knowledge of some elbows. Undoubtedly, it will draw the attention of elbow workers, and draw valuable experience to improve elbow technology. However, in the original text, the length of the mandrel is not fully described. In the spirit of mutual learning, this issue is discussed as follows. Indeed, core shrinkage directly affects the quality of the tube. Too early, the pipe will be elongated, and the outer edge of the wall thinning; Empress, the deformation coefficient increases, and when the bending radius is small, may have creases in the inner edge (Figure 1). Often encountered in a real situation, it is difficult to determine the value of the amount of core extension (or a range) is equal to how much, this time not