Patent ID: 9156117
Filing Date: 2015-10-13
Classification: B23Q,C22C,Y10T

Abstract:
1. A method of cutting a steel for machine structural use, wherein the steel comprises, by mass %, C: 0.01% to 1.2%, Si: 0.005% to 3.0%, Mn: 0.05% to 3.0%, P: 0.001% to 0.2%, S: 0.001% to 0.35%, N: 0.002% to 0.035%, and Al: 0.05% to 1.0%, wherein, [Al%] and [N%] representing mass % of Al and N in the steel respectively, the following formula 1 is satisfied, and a balance consisting of Fe and inevitable impurities, the method comprising: a cutting process is carried out on the steel using a water-insoluble cutting oil in which an amount of dissolved oxygen is 4 volume % to 16 volume % so as to generate an oxide mainly including alumina on a tool, and wherein a supply amount of the water-insoluble cutting oil is 0.5 L/minute to 100 L/minute in the cutting process.