Method of cutting steel for machine structural use
View Patent ↗In the method of cutting steel for machine structural use, steel for machine structural use, in which chemical components contain, by mass %, 0.01% to 1.2% of C, 0.005% to 3.0% of Si, 0.05% to 3.0% of Mn, 0.001% to 0.2% of P, 0.001% to 0.35% of S, 0.002% to 0.035% of N and 0.05% to 1.0% of Al, in a case in which [Al%] and [N%] represent the mass % of Al and N in the steel respectively, [Al%]−(27/14)×[N%]≧0.05% is satisfied, is the other elements are included as necessary, and a balance consisting of Fe and inevitable impurities, is used, and a cutting process is carried out on the steel for machine structural use using water-insoluble cutting oil in which the amount of dissolved oxygen is 4 volume % to 16 volume %.
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,
[Al%]−(27/14)×[N%]≧0.05% (1)
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.
2. The method of cutting the steel for machine structural use according to claim 1 , wherein the steel further comprises one or more of
Ca: 0.0001% to 0.02%,
Ti: 0.0005% to 0.5%,
Nb: 0.0005% to 0.5%,
W: 0.0005% to 1.0%,
V: 0.0005% to 1.0%,
Ta: 0.0001% to 0.2%,
Hf: 0.0001% to 0.2%,
Mg: 0.0001% to 0.02%,
Zr: 0.0001% to 0.02%,
Rem: 0.0001% to 0.02%,
Sb: 0.0001% to 0.015%,
Sn: 0.0005% to 2.0%,
Zn: 0.0005% to 0.5%,
B: 0.0001% to 0.015%,
Te: 0.0003% to 0.2%,
Se: 0.0003% to 0.2%,
Bi: 0.001% to 0.5%,
Pb: 0.001% to 0.5%,
Cr: 0.001% to 3.0%,
Mo: 0.001% to 1.0%,
Ni: 0.001% to 5.0%,
Cu: 0.001% to 5.0%,
Li: 0.00001% to 0.005%,
Na: 0.00001% to 0.005%,
K: 0.00001% to 0.005%,
Ba: 0.00001% to 0.005%, or
Sr: 0.00001% to 0.005%.
3. The method of cutting the steel for machine structural use according to claim 1 or 2 ,
wherein a temperature of the water-insoluble cutting oil is in a range of 5° C. to 80° C. in the cutting process.
4. The method of cutting the steel for machine structural use according to claim 1 or 2 ,
wherein, during the cutting process, a contact point between the steel and the tool is covered with the water-insoluble cutting oil.
5. The method of cutting the steel for machine structural use according to claim 4 , wherein a temperature of the water-insoluble cutting oil is in a range of 5° C. to 80° C. in the cutting process.