36375 (2).pdf - Introduction To ASME B46.1-2009 Donald K Cohen Ph.D ASME B46.1 2009 Standard The first B46.1 Standard was issued March 1940 since 1940 9

36375 (2).pdf - Introduction To ASME B46.1-2009 Donald K...

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1 Michigan Metrology, LLC Introduction To ASME B46.1-2009 Donald K. Cohen, Ph.D. 3/17/2011 The first B46.1 Standard was issued March 1940.. since 1940 --- 9 revisions… ASME B46.1 2009 Standard Michigan Metrology, LLC Introduction To ASME B46.1-2009
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2 Michigan Metrology, LLC Introduction to ASME B46.1-2009 Michigan Metrology, LLC Surface Texture..Why Is It Important? Surface: “The boundary that separates an object from another object, substance, or space…” Texture: “The composite of certain deviations that are typical of the real surface. It includes roughness and waviness…” X Y Z “Surface Roughness”, Ra is the average of the absolute value of profile heights over a given length (area). dxdy y x Z A S Lx Ly a 0 0 ) , ( 1 L R L Z x dx a L 1 0 ( ) 2D 3D ASME B46.1 2009 X Z
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3 Michigan Metrology, LLC Surface Texture..Why Is It Important? Functional / Performance Point of View ........ Rolling... Sliding .... Sealing .... Load Bearing .... Cosmetic Electrical Contact..Metal Forming...Lubricant Retention Friction .... Wear .... Adhesion Typical Applications Mechanical : Engine cylinder bore, rings, pistons, seals, shafts, gear, clutches, brakes, fuel delivery components, sensors ABS components, cutting tools, coatings, bearings ...... Electronics : Disk drive components, tape drive components, MEMS, solder bumps, ....... Misc : Materials (Polymer..),Printing (rolls/lithoplates/paper), Medical(Implants), Optical (contact lens) .... Michigan Metrology, LLC Surface Texture..Why Is It Important? Typical Relationship of Ra to Production Time($) Relative Time Ra m / What Texture do you need? How much does it cost? Key Discrete Parts -Value of U.S. Shipments 52% of all U.S. Manufacturing 10% of GDP 2009/$15,000,000,000,000 (GDP) NIST 1992
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4 Michigan Metrology, LLC Classification of Instruments for Surface Metrology Michigan Metrology, LLC Instruments for Texture Measurement Range and Resolution of Major Techniques Surface Amplitude Surface Wavelength
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5 Michigan Metrology, LLC Traversing Length Evaluation Length Sampling Length Filtering --- Form, Waviness and ROUGHNESS Form Waviness Remove Form Roughness Remove Form & Waviness Roughness Profile Remove Form & Waviness Michigan Metrology, LLC Filtering of Surface Texture Measurements - Gaussian s = Short Wave Cutoff ..... 50% Transmission .... Ao/Ai = 0.50 c =Long Wave Cutoff ...... 50% Transmission .... Ao/Ai = 0.50 s = 2.5 μm , 8 μm, 25 μm c = 0.08mm, 0.25mm, 0.8mm, 2.5mm, 8mm c/ s = 30, 100, 300 ...... Gaussian filters have minimal phase distortion ...... 0.8 mm 1 um Gaussian Filter c = 0.8mm 0.50 um 0.8 mm
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6 Michigan Metrology, LLC Filtering of Surface Texture Measurements 6 mm 40um -40um c = 2.5 mm, s =0 mm, 2 cutoffs Ra = 11.8um c = 0.8 mm, s =0 mm, 6 cutoffs Ra = 8.0 um c = 0.25 mm, s =0 mm, 20 cutoffs Ra = 4.3um c = 0.08 mm, s =0 mm, 60 cutoffs Ra = 1.4um Michigan Metrology, LLC Filtering of Surface Texture Measurements The cutoffs, c and
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