swiss

made

PRECISION

swissmade

PRECISION

…..grinding redefined…

swiss

made

PRECISION

swissmade

PRECISIONDefinition of Grinding

German DIN Standard 8580

Grinding = Machining with geometrically undefinedcutting edges

Milling / Turning = Machining with geometricallydefined cutting edges

swiss

made

PRECISION

swissmade

PRECISION

swiss

made

PRECISION

swissmade

PRECISION

(made of PSG = Precision Shaped Grain)

DIN definition of grinding is no longer valid!

New = Grinding can be machining with geometrically defined cutting edges

swiss

made

PRECISION

swissmade

PRECISION

grinding wheel structure

swiss

made

PRECISION

swissmade

PRECISIONWheel structure

Standard Ceramic Structure Structure

swiss

made

PRECISION

swissmade

PRECISION Shape of grain

Standard Ceramic

swiss

made

PRECISION

swissmade

PRECISIONCutting Behavior

of Conventional Abrasive Grains

swiss

made

PRECISION

swissmade

PRECISION

Chip Formation withCubitronTM II Grinding Wheels

Idealized image

swiss

made

PRECISION

swissmade

PRECISIONFlowing Chips

Grinding swarf that looks like the chips generated by turning ormilling operations.

swiss

made

PRECISION

swissmade

PRECISION

Chips generated with CubitronTM II Grinding

Wheels

swiss

made

PRECISION

swissmade

PRECISION

Economic factor: Universality

swiss

made

PRECISION

swissmade

PRECISION

Economic factor: Universality

fewer tool changing = less down timefew wheel specs = lower stock keeping cost

swiss

made

PRECISION

swissmade

PRECISION

Specification guide: OD grinding

5 specifications

swiss

made

PRECISION

swissmade

PRECISION

Specification guide: ID and Centerless

swiss

made

PRECISION

swissmade

PRECISION

Economic benefit: Grinding performance

• Up to 4x higher removal rates• Half of the grinding time – high energy

efficiency• Half amount of dressing

Energy costEfficiency

Hig

h

Low

swiss

made

PRECISION

swissmade

PRECISIONParameters :

• Surface speed vc (m/s)

• Feed-rate vw (mm/min)

• Speed ratio (wheel – workpiece) qs

• Dressing: Overlap ratio ud

• Specific material removal rate (Q-prime) Q‘w(mm3/mm/sec)

• Specific chip volume V‘w (mm3/mm)

swiss

made

PRECISION

swissmade

PRECISIONSurface speed vc

Gear grinding

Surface grinding

Cylindrical grinding

30-35m/sOD 45-80m/sID 45-80m/s30-45m/s

swiss

made

PRECISION

swissmade

PRECISION

Range of speed ratios qs

OD, ID, OD, ID, Surface,CL grinding

Critical range

burning

Creep-feed grinding

Speed ratio qs =Vc / Vw

swiss

made

PRECISION

swissmade

PRECISION

Dressing BehaviorStandard Ceramic versus CubitronTM II

Idealized image

swiss

made

PRECISION

swissmade

PRECISIONDressing Strategy

For roughing:Overlap ratio ud = 1, synchronous 0.6

For finishing:Overlap ratio ud = 4 to 6, asynchronous – 0.6 to – 0.8

Dressing interval compared to standard ceramic abrasives:Rule of thumb: 2 x more parts between dressing cycles, at 50% dressing depth

swiss

made

PRECISION

swissmade

PRECISION

Specific Material RemovalRate Q‘w

Q’w as performance factor

Materialremoval in mm3 per mmwheel width per second

swiss

made

PRECISION

swissmade

PRECISION

Q`w Values for Cubitron II (30%)

• OD grinding: 5-20 mm3/mm/s

• ID-grinding: 8-15 mm3/mm/s

• Centerless : 15-60 mm3/mm/s

• Surface grinding: 5-20 mm3/mm/s

• Gear grinding: 16-30 mm3/mm/s

swiss

made

PRECISION

swissmade

PRECISION

Economic and Quality Benefits of CubitronTM II

• No grinding burn if used properly

• Constant surface finish

• Half of standard grinding time

• Half of dressing amounts

• Half the number of dressing cycles

swiss

made

PRECISION

swissmade

PRECISION

• The next part– Blaser Swisslube Microbiology