• CN:11-2187/TH
  • ISSN:0577-6686

›› 1958, Vol. 6 ›› Issue (2): 81-93.

• 论文 • 上一篇    下一篇

铜线引拔力的一些问题之研究

杨先敏;杨本祺;顾泉芳   

  1. 中国科学院机械电机研究所
  • 发布日期:1958-03-01

AN INVESTIGATION ON THE DRAWING STRESS FOR COPPER WIRE

Yang Sienmin;Yang Bingchi;Koo Chuanfan   

  1. Institute of Mechanical and Electrical Engineering Research, Academia Sinica
  • Published:1958-03-01

摘要: 本实验采用预先施以不同加工量之铜线,取一定形式之拉模,在同一试验条件下进行冷拔。由实验得出:所有预先施以不同加工量之铜线,其冷拔时的引拔力与冷拔前的屈服应力(或冷拔钱的抗张强度)之比值和冷拔时的减缩率的关系曲线,在σp/σ0.2(或σp / σb)--q曲线,在减缩率10%-40%范围内互相接近地在同一曲线上。这就表明,在同样条件下所制作的所有拉模,摩擦系数均接近,又在拉模内线材的平均屈服应力与冷拔前线材的屈服应力的关系,在实验误差范围内,也很相接近。根据此曲线可提供一简便估计引拔力的方法,并由此曲线可推出拉模之平均摩擦系数。其次,关于因晶粒转向所需之引拔力,由本实验估计,则纯由理论推得者数值较大,不能引用。并且可以看出,以同一铜线进行冷拔,如冷拔的总减缩率及冷拔次数相同,而每次冷拔的减缩率不同时,则冷拔后线材的屈服应力(σ0.2)亦不相同。有实验得出铜线冷拔时,不同断面减缩率及不同预加工量对冷拔时的引拔力(σp )、冷拔后线材的抗张强度(σb)及屈服应力(σ0.2)等的关系。

Abstract: Within experimental error, the graph, obtained by plotting the percentage of reduction of cross-sectional area (over the range from 10% to 40%) against the ratio of drawing stress to the original yield strength of wire with different previous amount of reduction, approaches a single curve. This result suggests, within the above range, firstly, a simple method of estimation for the drawing stress for wires with various diameters and original yield strength, and secondly, a method for estimating the average coefficient of friction of the drawing dies. By computation, it shows that the theoretically derived correction for the effect of the twice rotation of copper grains in passing through the dies is not in agreement with experimental results. It is also found that the drawn wires of same total percentage of reduction of area and same number of drawings may have considerably different values of yield strength depending upon the percentage and the sequence of successive reductions.