Chipbreaker and Grade Selection Guide for Turning Steel Steel
Grades
AC8015P / AC8025P /
AC8035P / AC1030U
Covers a wide range of machining applications from high-speed to interrupted cutting and small lathes AC8015P : Development of crater damage is suppressed by controlling the orientation of the alumina crystal grains. Achieves long, stable tool life during high-speed and high feed cutting. AC8025P : Our 1st recommended grade for turning steel. Surface smoothing technology significantly suppresses adhesion of work material components. Achieves long, stable tool life with various cutting speeds and work materials. AC8035P : Tensile stress removal of the coating layer greatly improves fracture resistance. Achieves long, stable tool life during heavy interrupted cutting. AC1030U : Employs a new PVD coating, and a dedicated tough carbide substrate. High-quality cutting edge grade suppresses adhesion and micro-chipping, realizing excellent machined surface quality.
Performance
AC8015P
A
● Alumina crystal grain orientation control technology suppresses crater damage due to chip abrasion
Conventional Tool
5min
14min
Al 2 O 3
TiCN
TiCN layer exposed
Tool life
Crater damage progression due to peeling of alumina layer
Workpiece Material: SUJ2 (O.D. Continuous) Insert: CNMG432EGU Cutting Conditions: v c =985 SFM, f =0.012 IPR, a p =060”, Wet
Crystal orientation not aligned
AC8015P
5min
17min
29min
Al 2 O 3
TiCN
Minor Wear
TiCN layer exposed
Tool life
Crystal orientations aligned in the same direction Significantly suppresses alumina layer damage
Twice the crater wear resistance
Suppresses crater damage due to chip abrasion
AC8025P
● Surface smoothing treatment significantly suppresses adhesion and chipping
Conventional Tool
2min
70min
SEM image
Adhesion
Breakage
Unable to Continue
Workpiece Material: SCM415 (Face) Insert: CNMG432EGU Cutting Conditions: v c =330-985 SFM, f =0.012 IPR, a p =060”, Wet
Ra 0.4μm
AC8025P
2min
70min
120min
SEM image
Normal Wear
Minor Damage Only, Able to Continue
Ra 0.04μm
At least twice the adhesion/fracture resistance
Suppresses adhesion with ultra-smooth surface
AC8035P
● Special surface treatment reduces tensile stress in the coating layer, significantly suppressing breakages
Conventional Tool
.008
SEM image
.010
.012
0 0.1 0.2 0.3
0
250
500
No. of Impacts
Unable to Continue
Tensile stress in coating (GPa)
Workpiece Material: SCM435 (O.D. Interrupted) Insert: CNMG120408N-GU Cutting Conditions: v c =525 SFM, f =0.008-0.012 IPR, a p =080”, Dry
AC8035P
.008
SEM image
Tensile Stress 90% Reduced
.010
.012
0 0.1 0.2 0.3
0
250
500
No. of Impacts
All Corners Able to Continue
Tensile stress in coating (GPa)
At least twice the fracture resistance
Suppresses crack growth and breakages by reducing tensile residual stress
A12
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