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Cylinder Bore Surface Texture AnalysisMark C. Malburg, Ph.D.
Digital Metrology Solutions, Inc.
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Digital Metrology Solutions
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Copyright 2002 Digital Metrology Solutions, Inc.
Overview
• Why is plateau honing important? • How do you measure this?
– Instruments, settings (and problems)
• How do you describe the surface?
– Traditional methods – Rk parameters – Probability Parameters
Copyright 2002 Digital Metrology Solutions, Inc.
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Cylinder Liners/Bores
• “Let the engine do it”
– Given a rough surface, the engine will/may plateau itself.
• Time, debris, wear of other components
• Plateau Honing
– Generate a rough surface and remove the high areas in a controlled manner.
Copyright 2002 Digital Metrology Solutions, Inc.
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Plateau Honing
Copyright 2002 Digital Metrology Solutions, Inc.
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Why Plateau Honing?
Generate a surface texture that has the benefits of a smooth surface and the benefits of a rough surface.
Smooth on top Rough underneath
Copyright 2002 Digital Metrology Solutions, Inc.
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Surface Functionality
• Friction? Running clearance?
– Smoother plateau
• Wear? Sealing?
– More contact area
• Lubrication Retention? Debris Collection?
– Increased valley volume
Copyright 2002 Digital Metrology Solutions, Inc.
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A Complete Report (2D + 3D)
Copyright 2002 Digital Metrology Solutions, Inc.
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Stylus Based Approaches
• Two basic means
– Skidless
• Laboratory Style • Stylus Tip is the only thing that contacts the surface.
– Skidded
• A radiused “skid” rests on the surface and serves as a reference.
Copyright 2002 Digital Metrology Solutions, Inc.
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Skidless Measurement
• Provides “true” picture of surface
– Including waviness
• Alignment is critical
– Limited Working Range
• Sensitive to Vibration
– Test by measuring an optical flat.