- 著者
-
谷口 和雄
- 出版者
- 公益社団法人 精密工学会
- 雑誌
- 精密機械 (ISSN:03743543)
- 巻号頁・発行日
- vol.29, no.338, pp.209-219, 1963-03-05 (Released:2010-02-16)
- 参考文献数
- 4
(1) The orthogonal machining tests on lead were performed at different cutting conditions to measure the horizontal and vertical components of the cutting forces.According as the increase of rake angles ranging from 20° to 40°, the shear strain at a shear plane and the horizontal component of cutting force decreased, but the shear stress at a shear plane increased a little.According as the increase of cutting velocities ranging from 50 to 4, 000 mm/min, the shear strains varied very little, but the shear stresses increased some amount. These effects of cutting velocities were considered that the higher the cutting velocities, the greater the strain rates which accompanied strain hardening.(2) The angle between the cutting force and the direction of cutting, φR was expressed as follows.tan φR=Ft/Fc;φR=βf-α.The relation of shear angle φs with φR was expressed as φs+φR= 45° according to Leeshaffer, that is, φs=45°-βf+α, but the experimental results for lead revealed φs+φR<45°, and φo+φR_??_45°.φo is an ideal shear angle which was explained in Report 1.(3) The contact length of tool-chip was considered a very important factor to determine the shear strain and the shear stress of a chip at the rake surface of a tool.The contact length was measured experimentally by the observations of the wear land on the rake surface. On the other hand, the contact length was calculated theorically for the complex model of chip formation.The experimental value of the contact length was larger than the theoritical one which was used to determine the strain and stress of a chip at the rake surface in this report.(4) The equilibrium equation was treated between input energy and output energy for the orthogonal cutting system which contained material, a chip and a tool.Being based on the equilibrium equation, the cutting energy was analized mathematically for the complex model of chip formation which was explained in Report 1.(5) It was assumed that the cutting energy could be divided in some factors independently to each other, and that it was replaced by one shear strain and one shear stress.The assumptions are shown as follows :Wc{1-E(ω)/Wc}=τ1·γ1+τ2·γ2+τf·γfγt=γ1+γ2+γfτt=Wc/γt{1-E(ω)/Wc}_??_Wc/γtIn this report the relations of Wc(τ1·γ1+τ2·γ2+τf·γf) and γtτt, were checked experimentally for lead.