Why Dressing

Pushing

Free penetrating

Dressed Blades VersusNon Dressed Blades

Low diamondexposure

Low machinability

High diamondexposure

High machinability

High loads

Dressing

Dressing =Dressing =

• Exposing diamonds and releasing

partially embedded diamonds

•

Diamonds not exposed Diamonds exposed after

dressing

Dressing

• Improving Concentricity of

blade edge to spindle rotation

Dressing

• Shaping the edge geometry:

- Flat edge

- Special geometry:

(-V-, Others)

Flat edge

-V- edge

Angled cutAngled cut

Dressing Methods

• Electro polishing - nickel blades

Blades

Etching solution

Power supply

Dressing Methods

• Electro polishing - nickel blades

Cont.

Nickel blade

17mic. Grit - 330x / 1000x

after Electropolishing

Nickel blade

17mic. Grit - 100x

after Electropolishing

Nickel blade

17mic. Grit - 100xAfter fine grinding

with a Si. Ca. wheel

Dressing Methods

• Cylindrical grinding:

Silicon Carbide wheel

Blade

Dressing Methods

• Cylindrical grinding:

Cont.

Blade

Sil. Car. Grinding wheel

Flange

Arbor

Dressing Methods

Profile Grinding

Blade

Sil. Car. Grinding wheel

Dressing / Grinding Machine

Dressing / Grinding Machine

Dicing Dressing Media's

• Silicon Carbide - 320 / 600 / 800 mesh• Silicon• Others - Glass, Ceramic• Diamond plates (For resin single & gang ass.)

Dressing Resinoid Blades

• Not needed in most cases

- Self re-sharpening blade

Blade wearBlade wear

HighHigh

temperaturestemperatures

DiamondDiamond

ResinResin

Dressing Resinoid Blades

• Lapping to open the blade side surfaces:

Double plate

Lapping

Machine

CarriersBlades

Top plate

Bottom plate

For applications requiring very straight / perpendicular cutsFor applications requiring very straight / perpendicular cuts

Dressing Resinoid Blades

Cont.

15.5mm cut depth

Example of a thick PZT application:

Dressing Metal Bond Blades

Hard NickelHard Nickel

Or metal sinteredOr metal sintered

Hard and Hard and

sharp edgessharp edges

Diamond (Blocky)Diamond (Blocky)

Dressing Metal Bond Blades

• Dressing with dressing media’s on the saws:

Dressing media

General dressing methods on the saw

• Cleaning powder residue to expose the

diamonds

• Machining off blade binder to expose

diamonds

Diamonds not exposed Diamonds exposed after

dressing

General dressing methods on the saw

Cont.

• Flattening the blade edge

Before After

-- Lower the spindle RPMLower the spindle RPM-- Use multiple shallow cutsUse multiple shallow cuts

-- Use slow feed ratesUse slow feed rates

On Line Dressing

Sil. Carbide or Al. Oxide

Dressing Stick.

Substrate

After each cut the blades is passing

a dressing media.

Feed

Re - Dressing During the Dicing Process

Powder residuefrom the dicing

Blade edge

Dressing on the dressing station

Dressing station

Silicon Carbide600 mesh

Nickel / Diamond

Electroforming17, 30 & 50 mic. grit

Chuck

Dress station using a Nickel / Diamond media

• Designed only for dressing resinoid blades

• Should be used in a dicing mode not a

chop mode

Dress station using a nickel /diamond media

Chopping modeChopping mode

Single diamonds in contactSingle diamonds in contact

with the blade edgewith the blade edge

NickelNickel--Binder Binder

Blade edge with a copyBlade edge with a copy

of the diamonds geometryof the diamonds geometry

Z movement OnlyZ movement Only

Dressing mediaDressing media

Nickel & DiamondsNickel & Diamonds

ResinoidResinoid

Simulating the Chop mode

Metal file

Chop mode Shaping mode

Dress station using a nickel /diamond media

Z Z –– Copping mode Copping mode ––

Wrong process Wrong process

Edge defects Edge defects

due due

to high loadingto high loadingResinoidResinoid

Dressing mediaDressing media

Nickel & DiamondsNickel & Diamonds

Dress station using a nickel /diamond media

Y Y -- MovementMovement --

Stationary ZStationary Z

ResinoidResinoid ResinoidResinoidWear of blade edgeWear of blade edge

0.005- 0.015 mm

Dress station using a nickel / diamond media

QUP -020-C045-N 00777/P-O.D.56 mm-Resin

n Line Dressingof iProfile images

Before After

· Dressing media P/N-00776-65D0-051-3X3 – 30mic grit

· Spindle Speed – 18 Krpm

· Feed rated – 5mm/sec

· Cut depth – 0.015 mm on each pass

5x–of cuts to achieve a flat blade edge . No

-W-

Cont.

Dressing station with nickel / diamond media

QUP -020-6045-N 00777/P-O.D.”4.6–Resin

n Line Dressingof iProfile images

Before After

· Dressing media P/N-00776-65D0-051-3X3 – 30mic grit

· Spindle Speed – 8 Krpm

· Feed rated – 5mm/sec

· Cut depth – 0.015 mm on each pass

5x–of cuts to achieve a flat blade edge . No

-W-

Cont.

Dressing station with nickel /diamond media

Nickel or Metal sintered

Blade binder

Nickel / diamond dressing

block

Damaged diamonds

Diamonds remaining

in contact

with diamonds

Dressing a metal bond blade on a Dressing a metal bond blade on a

nickel / diamond dressing media:nickel / diamond dressing media:

Dress station using a Silicon Carbide media

• Designed for light / moderate dressing

• Used similar to standard dressing media

which is mounted on the chuck

• To clean powder residue on metal or resin

type blades

• Can be used for flattening blades edges,

mainly resinoid - (Slower mode)