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CoroMill® 745

Multi-edge face milling cutter for best production economy

CoroMill® 745 high feed cutter with 25° entering angle

Roughing and semi-finishing of machine bed in one operation

Component:​​​​​ Machine bed
Material: CMC ST52, 165 HB, casted
Operation: Roughing and semi-finishing
Machine: ISO-50 Gantry milling machine
No finishing tool needed​

-40%​
Cycle time / component

​​  CoroMill® 745 with 25° entering angle Competitor
Tool725-125Q40-21HDia 125 mm
Insert745R-2109E-M30 4230 
zn147
​n, rpm560680
vc​, m/min (ft/min)220 (722)267 (876)
vf, mm/min (in/min)6666 (262.4)3237 (127.4)
fz mm/z (in/z)0.85 (0.033)0.68 (0.027)
fn, mm/rev (in/rev)11.9 (0.469)4.76 (0.187)
ap mm (inch)1.5 (0.059)1.5 (0.059)
Cycle time per component (min) 2745
Pieces per assembly >2 2.43
Surface finish While the competitor needs to carry out an additional finishing operation, CoroMill® 745 can perform the complete operation in one step with no need for the surface to be finished.

CoroMill® 745 with 42° entering angle

Superior surface quality with the E-M31 geometry​

Component:​ Front support
Material: Nodular cast iron, GJS500, CMC 09.2
Operation: Roughing and finishing
Machine: Mazak FH 880, ISO 50 ​
21%​
Time savings

​​​ CoroMill® 745 with 42° entering angle Competitor
Tool745-125Q40-21HDia 125 mm
Insert745R2109E-M3114 edges
GradeK20D 
Cutting dataRoughing to finishingRoughing to finishing
zn1412
vc, m/min (ft/min)259 (850)259 (850)
vf, mm/min (in/min)2306–1384 (90.8–54.5)1898–1186 (74.7–46.7)
fz mm/z (in/z)0.25–0.15 (0.010–0.006)0.24–0.15 (0.009–0.006)
ap mm (inch)4.5–2.5 (0.177–0.098)4.5–2.5 (0.177–0.098)
Cycle time per component (min)3 min 5 sec3 min 50 sec
Result: After 100 minutes machining time, the M31-K20D geometry has generated a very good surface quality, significantly better than competitor. The customer also commented on the good sound and the cutting action.

Consistent and reliable heavy rough face milling of axle arm

​CoroMill 745 gave a consistent, reliable performance. The customer appreciated the positive cutting action, which provided a good sound and very good chip flow. The clamping felt very secure with the large screw.

 

 

+220%

Increased tool life

 

​​Component​​​​​​Axle arm on tractor
OperationHeavy rough face milling with variable depth of cut directly on casting surface ​
Workpiece materialSG Iron CMC 9.1
​Tool745-080Q27-21H​
​Insert​745R-2109E-M30 K20D​
​​​
 CoroMill® 745 with 42° entering angle ​Competitor tool
Diameter8080
zn​97​
n rpm (rev/min)​764​954
vc m/min (ft/min)​240 (787)​240 (787)
vf mm/min (in/min)1513 (60)1404 (55)
fz mm/z (in/z)0.22 (0.009)​0.21 (0.008)
ap mm (inch)​4.5 (0.177)​2.5 (0.1)
​​​
​Results
​Tool life80 comp/edge (80 min)​25 comp/edge (25 min)

Heavy rough face milling of gear box housing

CoroMill 745 made an excellent overall performance. The noise and vibration was significantly reduced and the chip flow was very good. Tool life increased by 60%.​​


 

+60%

Increased tool life

 

ComponentGear box housing on tractor
OperationHeavy rough face milling with variable depth of cut directly on casting surface
Workpiece materialGCI (GG30) CMC 8.2
Tool745-125Q40-21H
Insert745R-2109E-M30 K20D
CoroMill 745 with 42° entering angle Competitor tool
zn1412
n, rpm (rev/min)637637
vc, m/min (ft/min)250 (820)250 (820)
vf, mm/min (in/min)2289 (90)2289 (90)
fz mm/z (in/z)0.26 (0.010)0.26 (0.010)
ap mm (inch)3 (0.118)3 (0.118)
Cycle time (min/component)8 min, 21 sek8 min, 21 sek
Results
Tool life8 comp/edge (64 min)5 comp/edge (45 min)

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