under the guidance of assistant prof. m. p. gururajan presented by karan oberoi (2008amd3101)...
TRANSCRIPT
Under the guidance of Assistant Prof. M. P. Gururajan
Presented by Karan Oberoi (2008AMD3101)
Applied Mechanics Department IIT Delhi
Image Courtesy: www.ie.bilkent.edu.tr
Requirements:
1.Dimensional
Accuracy.
2.Surface Flatness.
3.Minimal Surface
Damage.
Draft from the Deutsches Museum in Munich,
Germany
Concept of a face lapping machine by Leonardo da VinciImage Courtesy: Handbook of Lapping and Polishing
Image Courtesy: www.cems.uvm.edu
Lapping parameters:
1. Lapping Wheels /
Plate
2. Lapping Medium
3. Lapping Abrasives
Hard / Soft
Slurry, which acts as the tool
5 m diameter alumina powder
sample
Lapping
Water
Ground Glass
Image courtesy: University of Illinois
Two body and three body abrasion
Image Courtesy: Handbook of Lapping and Polishing
Erosion wear
For ductile materialsFor brittle materials
Image Courtesy: Handbook of Lapping and Polishing
Deutsches Institut für Normung
Surface Lapping
Cylindrical Lapping
Thread Lapping
Profile Lapping
Lapping MachineImage Courtesy:
www. ctma.ncms.org
List of Abrasive Materials. Table Courtesy: South Bay Technology Inc
Lapping plate materials for brittle work-pieces:1.Diamond2.Cubic boron nitride3.Silicon carbide4.Aluminum oxide5.Corundum
Lapping plate materials for ductile work-pieces:1.Cast iron2.Copper3.Tin4.Lead
1. Scratches on work-piece. 2. Abrasive damage due to grain breakage.3. Forces developed affect properties of the
work-piece surface.
High accurate surface geometryGood qualityRepeatabilityRequired tolerance achievedNo warping of the componentsNo heat generation and thermal damage