Metal processes Flashcards
What are the advantages of extrusion?
- fast production
- accurate
- cheap process
- same cross-section throughout
What are the advantages of die casting?
- highly accurate
- very cheap per part
- very fast
- excellent surface texture
- complex shapes
- webs can be added for strength
What are the advantages of sand casting?
- cheap small scale production
- cheap set up costs
- very complex parts can be produced
- parts with varying thicknesses can be produced
- no wastageof materials
What are the advantages of piercing and blanking?
- accurate
- fast
- cheap
What are the advantages of press forming?
- accurate
- fast
- cheap
- bends, folds, and ridges will make the product stronger
What are the advantages of drop forging?
- fast
- very strong parts produced
- varying thicknesses can be achieved
- patterns can be added
- complex shapes can be produced
What are the disadvantages of extrusion?
- high set up costs
- extrusions will have to be cut and assembled to make products
What are the disadvantages of die casting?
- high set up costs
- have to hide visible identifying features
- flashing has to be removed
- parts are quite weak
What are the disadvantages of sand casting?
- poor surface texture
- time-consuming
- needs skilled labour
- needs to be machined to clean up surfaces, drill holes and remove additional metal
What are the disadvantages of piercing and blanking?
- high set up costs
- sheet material only
What are the disadvantages of press forming?
- high set up costs
- sheet material only
What are the disadvantages of drop forging?
- not very accurate
- flashing has to be removed
What are the identifying features of extrusion?
- long parts with the same cross-section throughout
- lines/scratches along length
- good surface finish
What are the identifying features of die casting?
- injection marks
- ejector pin marks
- split lines
- high-quality surface finish
- flash
What are the identifying features of sand casting?
- rough surface texture
- draft angle
- complex shapes
