Influence of cutting speed to the shear stress of Al-Zn eutectoid superplastic alloy containing Cu and Mg

• Published in: Journal of Japan Institute of Light Metals Vol. 27; no. 4; pp. 181 - 188
• Main Authors: SUZUKI, Masamitsu, OHSHIMA, Ikuya, YOSHIDA, Takemi, SHIBATA, Takao
• Format: Journal Article
• Language: Japanese; English
• Published: The Japan Institute of Light Metals 30.04.1977
• ISSN: 0451-5994; 1880-8018
• DOI: 10.2464/jilm.27.181

A wet, orthogonal and slow speed machining test was performed to determine an independent effect of cutting speed on the shear stress. The test meets the requirements of constant temperature and freedom from a built-up edge. The stress τs on the shear plane (kgf/mm2) are expressed as a function of the cutting speed V (mm/min) or the shear strain rate γ (sec(-1)). τs = τ1Vn(1) τs = τ1'γm(2) Where, τ1: Shear stress when V is 1mm/min, τ1': Shear stress when γ is 1 sec(-1), n: Exponent of cutting speed sensitivity, and m: Exponent of shear strain rate sensitivity. If γ in equation (2) is assumed as shown in equation (3), m equals n. γ=Vs/t1(3) Where, Vs: Shear speed on the shear plane (mm/sec), and t1: Depth of cut (mm). n and m in equations (1) and (2) are changed in the range from 0.052 to 0.092 with the rake angle of the tool and the depth of cut.