研削液の冷却効果に関する研究 (第1報)

熱伝達率の測定法と局所熱伝達率分布

抄録

The cooling action of grinding fluid is expected to improve the accuracy and quality of finished surfaces and to enhance the grinding efficiency. However the exact value of the local heat transfer coefficient at the wheel to workpiece contact zone, α, has hardly been known. In this paper, a new method for measuring α in the vicinity of the contact zone is proposed. The error introduced in this method is estimated by using a finite element method, and the factor for correcting the measured value is derived. Thereby the distribution of α is measured in some conditions of supplying grinding fluid, and following results are obtained : (1) α increases with the decrease of the gap distance between wheel and workpiece, L G, however it becomes almost constant in the range Δ G <50μm. (2) α marks the peak value at the center of the contact zone and it sharply declines around this point. (3) α increases with the velocity of grinding fluid, but after it attains about 120 kW/m²K it becomes constant.