Abstract
As a continuation of the last paper, the mean temperature rise θ at tool-chip interface was.analysed from chip side cooled by cutting fluid. Within the scope of conditions in usual metal cutting, θ is written approximately as follows :
θ=θd [1-3/4An+1/4 (An) 2]
where, symbols are same as in the last paper, and θd that is a mean temperature rise in dry cutting is 0.1155 ψt2 √n for n<100/3, and (n/200 + 1/3 -1.847/n) ψt2 for n>100/3. The cooling efficiency (1+θ/θd) increases as the value of (am/Vft22) √hθsK/ (1-δ) Q increases, and its maximum is only 30% at most in low speed and light cutting for a steel and water soluble oils. And the efficiency is 1 % at the cutting speed Vc 400, 80 and 40m/mn for the thickness of uncut chip t1 0.1, 0.3 and 0.5 mm. But, pouring by jet, this efficiency increases nearly double.
