3M cubitron abrasive grain Benutzerhandbuch
3M™ Cubitron™ Abrasive
Grain 321
Grain 321
Fracture Toughness for Vitrifi ed Bonds
Bonded abrasive construction should be designed to
achieve maximum grinding pressures per individual
grain. So to stand up to high pressure grinding forces,
a grain needs a high degree of fracture toughness (also
known as critical stress intensity factor).
achieve maximum grinding pressures per individual
grain. So to stand up to high pressure grinding forces,
a grain needs a high degree of fracture toughness (also
known as critical stress intensity factor).
Other benefi ts include:
• Durability
•
Hard
•
Self-sharpening
• High Cut Rates
• Cool Running
• Consistent Quality
Chemical and Physical Properties
3M Cubitron Grain 321 has
a complex, polycrystalline
microstructure composed of
crystallites of alpha alumina,
magnesium alumina spinel and
a rare earth hexagonal aluminate.
a complex, polycrystalline
microstructure composed of
crystallites of alpha alumina,
magnesium alumina spinel and
a rare earth hexagonal aluminate.
Celebrating 25 Years of Industry Leading Performance
Introduced in 1981, 3M™ Cubitron™ Abrasive Grain was the world’s fi rst commercial abrasive grain
application of sol gel technology. With a 100 plus year history of abrasive knowledge, 3M initially used
the mineral in its own product lines which became the industry standards for applications requiring tough,
long-lasting abrasives. Cubitron grains have since been developed, enhanced and improved — creating a
family of minerals that continue to raise the bar for high performance abrasive grains.
application of sol gel technology. With a 100 plus year history of abrasive knowledge, 3M initially used
the mineral in its own product lines which became the industry standards for applications requiring tough,
long-lasting abrasives. Cubitron grains have since been developed, enhanced and improved — creating a
family of minerals that continue to raise the bar for high performance abrasive grains.
With Cubitron Grain in
Your Formulation, You and
Your Customers Receive
Your Formulation, You and
Your Customers Receive
the Benefits of:
• The Right Abrasive for the Application
• Longer Abrasive Life
• Consistently Sharp Cuts
• Cooler Running Products
• Reduced Cycle Time and More Cycles Per Dress
• More Productivity from the Same Equipment
• Differentiation for your Product Line for Greater Value
• Greater Competitiveness for Your Customers
• Longer Abrasive Life
• Consistently Sharp Cuts
• Cooler Running Products
• Reduced Cycle Time and More Cycles Per Dress
• More Productivity from the Same Equipment
• Differentiation for your Product Line for Greater Value
• Greater Competitiveness for Your Customers
Typical Chemical Properties:
Al
2
0
3
94–96%
MgO
0.9 – 1.5%
Y
2
0
3
0.9 – 1.5%
La
2
0
3
+ Nd
2
0
3
1.9 – 2.9%
Traces of: Ti0
2
, Si0
2
, CaO, CoO and Fe
Fractured 321 Grain
Cubitron
Abrasive
Abrasive
Grains’ Unique
Microstructure
Microstructure
Operates Well
Under High
Force/Grit
(high stress)
Self-Sharpening
Tough
Hard
3M™ Cubitron™ Abrasive
Grain 324
Grain 324
More Friable Grain for Resin Bonds
Cubitron Grain 324 fractures and self-sharpens
at lower forces making it ideally suited for resin
bonded abrasives.
at lower forces making it ideally suited for resin
bonded abrasives.
Twenty fi ve percent more friability than 321,
Cubitron Grain 324 is more compatible with resin
bonds and their grinding applications, such as roll
grinding, centerless grinding and cut-off wheels.
The mineral breaks down under lower pressure
grinding rather than breaking out of the resin bond.
It may even be a suitable alternative in vitrifi ed
bonds where 321 is too tough.
Cubitron Grain 324 is more compatible with resin
bonds and their grinding applications, such as roll
grinding, centerless grinding and cut-off wheels.
The mineral breaks down under lower pressure
grinding rather than breaking out of the resin bond.
It may even be a suitable alternative in vitrifi ed
bonds where 321 is too tough.
In appropriate applications, Cubitron Grain 324 offers:
• Improved “Grinding Ratio”
• Lower power consumption
• Good surface fi nish
• High cut rates
•
Self-sharpening
• Cool running
• Consistent Quality
Modifi ed Chemistry, Similar Structure
Cubitron Abrasive Grain 324 has a complex
polycrystalline microstructure composed of
crystallites of alpha alumina, yttrium aluminum
garnet and a rare earth hexagonal aluminates.
Like 3M Cubitron Abrasive Grain 321, the 324
grain is tough, hard and self-sharpening, thanks
to its two-phase microstructure. Its modifi ed
chemical composition provides its unique
performance characteristics:
polycrystalline microstructure composed of
crystallites of alpha alumina, yttrium aluminum
garnet and a rare earth hexagonal aluminates.
Like 3M Cubitron Abrasive Grain 321, the 324
grain is tough, hard and self-sharpening, thanks
to its two-phase microstructure. Its modifi ed
chemical composition provides its unique
performance characteristics:
Cubitron
™
Abrasive Grain 324 — 2 Phase Microstructure
Typical Chemical Properties:
Al
2
0
3
92.3 – 95.6%
MgO
.075% – 1.25%
Y
2
0
3
.075% – 1.5%
La
2
0
3
+ Nd
2
0
3
3.0% – 5.0%
Traces of: Ti0
2
, Si0
2
, CoO
Traces of Iron may be found on the surfaces of some
abrasive grains
abrasive grains
50
45
40
35
30
Cubitron 324
Cubitron 321
Comparative Friability between
Cubitron 324 and Cubitron 321
Cubitron 324 and Cubitron 321
Friability Index
Low High
Hardness/Toughness for Various Mineral Types
High
Low
Fused Alumina
324
321
AZ
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6060191_61-5002-8136-7.indd 2
6/8/06 1:13:59 PM
6/8/06 1:13:59 PM