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