伸線条件，および多パス伸線が細線伸線材の
表層部付加的せん断ひずみ層に与える影響

— 引抜き材における表層部付加的せん断ひずみ層の研究　第3報 —

抄録

Fine wires (with a diameter less than 0.4 mm) have been extensively used for precision machines and other devices. It is well known that finely drawn wires have a much higher tensile strength than thick drawn wires. One of the main factors for this characteristic has been determined to be an “additional shear strain layer”. The main purpose of this research is to clarify the relationship between the additional shear strain layer and the tensile strength of fine wire. In this paper, firstly the effects of the friction between the die and the wire and the die semiangle on the additional shear strain layer were investigated. It was ascertained that friction work was most effective for increasing the tensile strength of the additional shear strain layer and increasing in the tensile strength of the fine wire. Secondly, the additional shear strain layer generated in the multipass drawing was investigated. In the case of low-carbon steel, the increase in tensile strength of the additional shear strain layer was limited. On the other hand, the tensile strength of the additional shear strain continued to increase in high-carbon steel.