Grinding/Finishing Operations

Question 1

Grinding Process

Answer 1

Material removal process through the use of abrasive wheel

-secondary operation for smooth surface finish

Question 2

Abrasives

Answer 2

harder than conventional cutting materials

Advantages: Friability: ability of abrasive grains to fracture into smaller pieces–> self sharpening

Question 3

Structure coated abrasive

Answer 3

1. Backing
2. Make coat
3. abrasive grains
4. Size coat

Question 4

Types of Grinding

Answer 4

1. Surface Grinding
2. Cylindrical Grinding
3. Centerless Grinding

Question 5

Surface Grinding

Answer 5

Uses a grinding wheel to shape flat or formed surfaces
produces high surface accuracy

• traverse grinding: grinding whole surface, moves sideways
• plunge grinding: wheel is moved radially into the workpiece and out. no sideway movement

Question 6

Cylindrical Grinding

Answer 6

process that removes material from the exterior of cylindrical part; grinding wheel and workpiece rotate in different directions;
–> Form grinding: Grinding Wheel/tool just built to shape one specific form of finished workpiece

Internal Grinding: produces formed surfaces in the interior of workpiece
requires a coolant

Question 7

Centerless Grinding

Answer 7

process that relies on the relative rotation of grinding wheel and regulating wheel to keep workpiece rotating
–> most efficient for feed through processes ; no chucking or mounting required

Question 8

Honing

Answer 8

low speed process that removes metallic dust for a very high accurate surface finish and accuracy, simultanioulsy rotating and reciprocating between piece and tool.
–> superfinishing: honing with very light pressure

Question 9

Lapping

Answer 9

abrasive process in which a rotational lap with abrasive slurry removes small amounts of material (non metallic and metallic)
- extreme flatness and good surface finish

Question 10

Barrel Tumbling

Answer 10

finishing process where abrasive media, water and the workpiece is filled in barrel which is rotated to grind the workpiece

Question 11

Cost of Grinding

Answer 11

getting a smooth and high accurate surface finish is very expensive (tooling cost)—> dont do more than neccessary