Mechanical Surface Finishing Processes Chapter 16.
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Transcript of Mechanical Surface Finishing Processes Chapter 16.
![Page 1: Mechanical Surface Finishing Processes Chapter 16.](https://reader036.fdocuments.in/reader036/viewer/2022083010/5697bfef1a28abf838cba482/html5/thumbnails/1.jpg)
Mechanical Surface Finishing Processes
Chapter 16
![Page 2: Mechanical Surface Finishing Processes Chapter 16.](https://reader036.fdocuments.in/reader036/viewer/2022083010/5697bfef1a28abf838cba482/html5/thumbnails/2.jpg)
Finishing vs other final processes
• Finishing processes are not intended to significantly change the dimensions of the product.
• Finishing processes are intended to:– Achieve closer tolerances– Provide a protective coating– Improve the appearance of the part
![Page 3: Mechanical Surface Finishing Processes Chapter 16.](https://reader036.fdocuments.in/reader036/viewer/2022083010/5697bfef1a28abf838cba482/html5/thumbnails/3.jpg)
Surface Preparation
• Deburring– Hand– Barrel and vibratory– Belt or disk sanding
• Stripping/Cleaning– Dry and wet blasting– Power Brushing– Ultrasonic cleaning
![Page 4: Mechanical Surface Finishing Processes Chapter 16.](https://reader036.fdocuments.in/reader036/viewer/2022083010/5697bfef1a28abf838cba482/html5/thumbnails/4.jpg)
Smoothing Operations
• Honing– Abrasive stones– Finish auto cylinder walls
• Superfinishing– Chrysler Corp version of honing
• Lapping– Removes less than 0.0005 inch (0.01
millimetre)
![Page 5: Mechanical Surface Finishing Processes Chapter 16.](https://reader036.fdocuments.in/reader036/viewer/2022083010/5697bfef1a28abf838cba482/html5/thumbnails/5.jpg)
Polishing
• Fine scale abrasion
• Smearing– Push high points over into the low places to
smooth out the surface.
![Page 6: Mechanical Surface Finishing Processes Chapter 16.](https://reader036.fdocuments.in/reader036/viewer/2022083010/5697bfef1a28abf838cba482/html5/thumbnails/6.jpg)
Buffing
• Used to produce a high luster
• Remove scratches from the surface
• Often precedes polishing
• Gives a smooth lustrous surface, Polishing puts the shine on the part.
![Page 7: Mechanical Surface Finishing Processes Chapter 16.](https://reader036.fdocuments.in/reader036/viewer/2022083010/5697bfef1a28abf838cba482/html5/thumbnails/7.jpg)
Burnishing
• Brush the surface with a wire brush
• Uniform smooth finish
• Dull surface
![Page 8: Mechanical Surface Finishing Processes Chapter 16.](https://reader036.fdocuments.in/reader036/viewer/2022083010/5697bfef1a28abf838cba482/html5/thumbnails/8.jpg)
Ballizing
• Forcing a ball through a hole slightly cut undersize.
• The ball passing through the hole– Hardens– Sizes– Smoothes
![Page 9: Mechanical Surface Finishing Processes Chapter 16.](https://reader036.fdocuments.in/reader036/viewer/2022083010/5697bfef1a28abf838cba482/html5/thumbnails/9.jpg)
Bearizng
• Used on larger holes than ballizing
• Roller bearings are mounted similar to honing stones– Sizes – Work hardens the hole.
![Page 10: Mechanical Surface Finishing Processes Chapter 16.](https://reader036.fdocuments.in/reader036/viewer/2022083010/5697bfef1a28abf838cba482/html5/thumbnails/10.jpg)
Finish Specification
• Information needed– Process of final manufacturing operation– Waviness, roughness and lay required– Process of the surface prep or finish– Type of coating to be applied– Process to apply the coating
• See page 324