16-08-2012, 10:45 AM
Design & fabrication of lapping machinefor fatigue test sample
1Design & fabrication.pptx (Size: 1.79 MB / Downloads: 55)
introduction
Lapping is a process in which two surfaces are rubbed together with an abrasive between them.
This can take two forms.
The first type (grinding), involves rubbing a brittle surface against another brittle surface with an abrasive in between them.
This produces microscopic conchoidal fractures as the abrasive rolls about between the two surfaces and removes material from both.
The other form involves a softer material for the lap, which is "charged" with abrasive.
The lap is then used to cut a harder material—the work piece.
The abrasive embeds within the softer material which holds it and permits it to score across and cut the harder material
Taken to a finer limit, this will produce a polished surface
We are using this form of lapping
Problem definition
Component gives wrong interpretation on fatigue test because of surface having irregularities such as tool mark or rough finish
So lapping is accomplished to give a smoother finish in order of 30UM.
Lapping Machine available in the market cost around 1.64Lac to 4.5Lac which is costly for lab dealing with fatigue test
CONCLUSION
Simple in design
Economical
Less space requirements