Page 193 - Tungaloy Catalog

T-CBN series for machining hardened steels and hard materials T-CBN series for machining sintered metals

j Application area BX470
d Ferrous sintered metal d Valve seat Priority on burr prevention and surface finish
980 400 BX480
65 BX480 Priority on wear resistance and versatility
Cutting speed Vc (SFM) 500 Cutting speed Vc (SFM) BX950
60 BX470 330 BX480 BX950 3
55 For general sintered metal parts
50 BX950 165
45
100 SMF40X0 series material (JPMA standard)
1-2μm 4-8μm Diesel engine
0 0
55 60 65 300
Hardness of work material (HRC) Hardness of work material (Hv) PCD and PCBN Tools
Features of dMachining of sintered metal including hard particles dFeatures of BX470 and BX480
BX470 and BX480 Conventional grade BX470 / BX480 CBN content: 95 vol%
Hv = 4000 ~ 4300

The world highest CBN content as a
Hard particle Binder CBN grain
Binder phase are selectively worn away by hard particles. By increasing CBN content, wear of binder layer is suppressed. commercially available material.
e Wear proceeds with falling-out of CBN grains, e Improved wear resistance
j BX480 (Facing of gears) j BX470/BX480 Tool failure after machining sintered metal j BX470 (Tool life criterion: Burr occurrence)
600
300
Number of machined parts 200 Vc = 400 SFM Number of passes 400
Vc = 820 SFM
250
150
980 980 100 Conventional BX480 200
PCBN grade
After machining
After machining
300 pcs.
50
150 pcs.
660 660 0 Conventional grade BX480 Cutting conditions 0 BX470 BX480 Competitor A Competitor B
Cutting conditions d Work material: Sintered metal (> HRA60), Nitriding, Hard particles included Cutting conditions
d Work material: Sintered metal (> HRA60) d Cutting speed: Vc = 360 SFM d Depth of cut: ap = .006 in d Work material: Ferrous sintered metal
d Feed: f = .004 in/rev d Coolant : Water soluble type
d Insert: DCMW11T308 d Interrupted cutting d Cutting speed: Vc = 330 SFM
330 330 d Depth of cut: ap = .008 ~ .020 in d Depth of cut: ap = .006 ~ .012 in
d Feed : f = .003 in/rev d Feed: f = .003 ~ .009 in/rev
d Coolant : Water soluble type d Interrupted cutting d Dry and interrupted cutting
0 T-CBN series for machining grey and ductile cast irons
0 .006 .012
j Application area d Solid coated T-CBN grades
dFC and FCA (JIS) dFCD (JIS) BX930 Area for
5000 BX930 · General purpose, first choice 5000 finishing Area for roughing BXC90
Cutting speed Vc (SFM) 3300 BX950 BX930 BX950 Cutting speed Vc (SFM) 3300 Conventional BXC90 (FX105) · One-piece solid
grade.
· Dedicated grade for machining
Ceramic grades
ductile cast iron
structure
· Suitable for interrupted
· Applicable for small
1650
PCBN
machining
to large depths of cut
1650
· Excels in impact resistance
grades
FCD700 BX910
Continuous
Interrupted
FCD400
.120
.040
.160
.080
· For machining cylinder liners 0 T5100 series (Coated carbide)
Depth of cut (in)
j Machining of cylinder liners (Machining example of BX910) j Tool life comparison in finish machining of disc brakes
19 2000
dWear width after machining 120 pcs. dTool failure after machining 120 pcs.
.004 BXC90
15 .020 1600
14
.003 .012 Ceramic
.016
.002 10 BX910 Competitor 1200 Cutting conditions
10 .008 Number of machine parts (pcs.)
.012
(JIS FC250)
.001 Max. flank wear width VBmax (mm) Cutting conditions 800 d Work material: Disc rotor
5 .008 d Insert: SNGN 120412 (BXC90)
.0008 .004 d Work material: 400 d Depth of cut: ap = .028 in
.004
d Feed: f = .014 in/rev
Cylinder liner (Spin casting)
0 0 Machining type: Finish boring 0 d Coolant: Dry
10 20 30 0 980 1650 2625 3300 d Tool life criterion:
0 d Cutting speed: Vc = 3,200 SFM Conditions of finished surface
BX910 Competitor Cutting speed: Vc (SFM)
d Machine: Special purpose machine
d Coolant: Wet
3–5