SUMIBORON for Cast Iron / Powdered Metal Machining BN7000
Sintered Alloy
Cast Iron
For high-speed finishing of cast iron, powdered metals and exotic alloys
■ General Features Medium-grain CBN sintered to a high density to achieve the maximum content percentage. Also delivers superior fracture resistance by increasing the bonding strength between CBN particles. Provides long, stable tool life for high-speed finishing work with cast iron, powdered metals and exotic alloys.
Acid-treated CBN Sintered Body Structure
L
BN7000
Competitor's CBN for Cast Iron
Holes formed when binder dissolved during acid treatment
Few Holes
Too Many Holes
■ Features
● Excellent for high-speed finishing of cast iron Excellent fracture resistance and reduced occurrence of thermal cracking in high speed machining of gray cast iron. ● High-efficiency machining of powdered metal Standard + 2 different types of edge treatment, achieving long, stable tool life in machining of powdered metal of any shape or hardness. ● Able to machine any exotic alloy Exhibits high performance for the machining of exotic alloys such as rolls, HSS, heat-resistant alloys, etc.
■ Cutting
Cast Iron Milling
Turning of Powdered Metal
BN7000
No breakage in any of the samples
Performance
90
BN7000
Conventional CBN
60
BN7000 Able to Continue
Breakage
30
Conventional CBN
Breakage
Breakage
Conventional Tool Breakage
0
0
1,650
3,300
5,000
6,600
25
50 75 100
No. of Workpieces (Times)
Cutting Speed (SFM)
Part Material: Grey Cast Iron (Pearlite) Tool Cat. No.: FMU4100R SNEW1203ADTR Cutting Conditions: v c =1650 - 6,600 SFM,
Work Material: SMF4040 (70HRB, Interrupted Cutting) Tool Cat. No.: 2NU-CNGA432 Cutting Conditions: v c = 825 SFM,
f = .0039 IPR, a p = .0118” Dry
f = .0079 IPR, a p = .00118” Dry
■ Recommended Cutting Edge Treatment
Cast Iron Turning
Poor surface roughness
LF Type Sharper Edge
.0040
Conventional CBN
.0032
BN7000
For higher dimensional tolerance with minimal burr
Standard
.0024
Chipping
.0016
Strong Edge
HS Type
.0008
Frequency of Interruption
Heavy
0
12.50
25.00
62.50
75.00
E
W Honing Standard 15° .12 mm No LF Type Sharp Edge No HS Type 25° .12 mm Yes
Rake Face
Negative land width W
Cutting Distance (miles)
R Negative land angle
Work Material: FC300 (Pearlite) Tool Cat. No.: 2NU-CNGA432 Cutting Conditions: v
CBN
Honing
Flank
c = 2,650 SFM,
f = .0059 IPR, a p = .0079” Wet
L18
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