Why Dressing Pushing Free penetrating
Dressed Blades Versus Non Dressed Blades High loads Low diamond exposure Low machinability High diamond exposure High machinability
Dressing Dressing = Exposing diamonds and releasing partially embedded diamonds Diamonds not exposed Diamonds exposed after dressing
Improving Concentricity of blade edge to spindle rotation Dressing
Dressing Shaping the edge geometry: Angled cut - Flat edge Flat edge - Special geometry: (-V-, Others) -V- edge
Electro polishing - nickel blades Dressing Methods Power supply Etching solution Blades
Cont. Electro polishing - nickel blades Dressing Methods Nickel blade 17mic. Grit - 330x / 1000x after Electropolishing Nickel blade 17mic. Grit - 100x after Electropolishing Nickel blade 17mic. Grit - 100x After fine grinding with a Si. Ca. wheel
Dressing Methods Cylindrical grinding: Blade Silicon Carbide wheel
Dressing Methods Cont. Cylindrical grinding: Sil. Car. Grinding wheel Blade Flange Arbor
Dressing Methods
Profile Grinding Sil. Car. Grinding wheel Blade
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.)
Not needed in most cases - Self re-sharpening blade Dressing Resinoid Blades High temperatures Resin Blade wear Diamond
Dressing Resinoid Blades Lapping to open the blade side surfaces: For applications requiring very straight / perpendicular cuts Carriers Blades Double plate Lapping Machine Top plate Bottom plate
Dressing Resinoid Blades Cont. Example of a thick PZT application: 15.5mm cut depth
Dressing Metal Bond Blades Hard and sharp edges Diamond (Blocky) Hard Nickel Or metal sintered
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 RPM - Use multiple shallow cuts - Use slow feed rates
On Line Dressing After each cut the blades is passing a dressing media. Substrate Sil. Carbide or Al. Oxide Dressing Stick. Feed
Re - Dressing During the Dicing Process Powder residue from the dicing Blade edge
Dressing on the dressing station Nickel / Diamond Electroforming 17, 30 & 50 mic. grit Silicon Carbide 600 mesh Chuck Dressing station
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 Dressing media Nickel & Diamonds Chopping mode Z movement Only Resinoid Single diamonds in contact with the blade edge Binder - Nickel Blade edge with a copy of the diamonds geometry
Simulating the Chop mode Metal file Chop mode Shaping mode
Dress station using a nickel /diamond media Z Copping mode Wrong process Resinoid Edge defects due to high loading Dressing media Nickel & Diamonds
Dress station using a nickel /diamond media Stationary Z Resinoid Wear of blade edge Resinoid Y - Movement - 0.005-0.015 mm
Dress station using a nickel / diamond media Cont. Profile images of in Line Dressing Resin - 56 mm O.D. - P/N 00777-C045-020-QUP -W- 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 No. of cuts to achieve a flat blade edge 5x
Dressing station with nickel / diamond media Cont. Profile images of in Line Dressing Resin 4.6 O.D. - P/N 00777-6045-020-QUP -W- 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 No. of cuts to achieve a flat blade edge 5x
Dressing station with nickel /diamond media Dressing a metal bond blade on a nickel / diamond dressing media: Nickel or Metal sintered Blade binder Diamonds remaining in contact with diamonds Damaged diamonds Nickel / diamond dressing block
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)