{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 4b - Surface and Tribology

Lecture 4b - Surface and Tribology - Produced with a Trial...

Info icon This preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Surface Characteristics and Tribology Lecture 4.b ISE 2204 – Introduction to Manufacturing Processes Dr. Jaime Camelio February 12 th , 2009 Surface Properties Surface Structure Surface Roughness Tribology Friction Wear Lubrication Surface Treatment ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Outline Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Although bulk material determines the overall mechanical properties, the surface affects: Friction and wear Effectiveness of lubricants Appearance Fatigue crack initiation Corrosion The manufacturing process determines many surface properties ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Surface Properties Schematic illustration of the cross-section of the surface structure of metals. The thickness of the individual layers depends on processing conditions and the environment ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 conditions and the environment. Source : After E. Rabinowicz and B. Bhushan . Surface Structure
Image of page 2
Metal substrate Bulk material properties depend on composition and processing. Work hardened layer Deformed during processing -- may have recrystallized Beilby or amorphous layer Region that melted and then rapidly solidified -- not always present Oxide layer Can be protective or non protective -- affects friction and wear Adsorbed gas Contaminants ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Surface Structure Flaws Random irregularities such as cracks, depressions, etc. Lay Direction of the predominant surface pattern Waviness Long wavelength deviations Waviness width Waviness height Roughness Short wavelength deviations superimposed on the waviness ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Surface Texture and Roughness
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
AA (arithmetic average) or CLA (center line average) roughness, R a (y a are absolute values) Root mean square roughness, Rq Rq gives more weight to large deviations ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Surface Roughness Methods ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Surface Texture Standard terminology and symbols used to describe surface finish. The quantities are given in μ in. Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com
Image of page 4
ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Surface Texture Specification Common surface-lay symbols.
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}