Page 1023 - Tungaloy Catalog

Technical Reference
Turning Tools
dCutting forces
(1) Finding from the diagram based on experimental data.
(2) In case determining by simplified equation:
F : Cutting force (N)
Cutting force in turning 2
kc : Specific cutting force (N/mm )
Back force [Refer to the Table below]
Feed force ap : Depth of cut (in)
f : Feed (ipr)
Example :
Resultant cutting force Calculating the cutting force when
cutting high carbon steel (JIS S55C) at
.007 in/rev feed and ap =
Principal force 3 in depth of cut.
F=343030.2=2058N
dCalculating power requirement Pc : Net power requirement (kW)
c kc : Specific cutting force (N/mm )
2
[Refer to the Table below]
vc : Cutting speed (SFM)
ap : Depth of cutting (in)
f : Feed (ipr)
Value of specific cutting force (kc)
Value of specific cutting force on feed kc (N/mm )
2
Work material Tensile strength (Mpa) Hardness (HB)
.001 (ipr) .004 (ipr) .008 (ipr) .016 (ipr) .039 (ipr)
SS400, S15C 390 100 3430 2840 2450 2080 1700
S35C, S40C 590 170 4220 3490 2940 2500 2080
S50C, SCr430 785 230 4900 4020 3430 2940 2400
SCM440, SNCM439 980 300 5390 4410 3780 3240 2650
SDK 1765 ( 56HRC ) 56HRC 8390 6870 5880 5000 4120
FC200 ( 160HB ) 160 2550 1960 1630 1340 1030
FCD600 ( 200HB ) 200 3330 2550 2110 1750 1340
Aluminum alloy ( 89HB ) 89 1350 1130 950 810 670
Aluminum 1050 870 740 640 520
Magnesium alloy 390 390 390 390 390
Brass 1080 1080 1080 1080 1080

dBending stress and tool deflection
Bending stress
Square shank (1) Square shank
S : Bending stress in shank (MPa)
F : Cutting force (N)
L : Overhang length of tool (in)
( MPa )
b : Shank width (in) Technical Reference
(2) Round shank h : Shank height (in)
Ds : Shank diameter (in)
E : Modulus of elasticity of shank
material (MPa)
( MPa )
14
Tool defection (in)
Round shank
(1) Square shank
øDs
( in )
(2) Round shank (Ref.) Values of E
Material MPa (N/mm ) {kgf/mm }
2
2
Steel 210,000 21,000
( in ) Cemented 560,000~620,000 56,000~62,000

Carbide
14–5