Hot Forming Processes (Junior Cert Engineering): Flashcards
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Hot forming processes
Hot forming processes
Heating metal until soft & workable, then shaping it
Key advantage of forgework
Key advantage of forgework
Grain structure follows shape, making it stronger
Two main types of forges
Two main types of forges
Coal/coke-fired and gas forges
Function of the anvil
Function of the anvil
Main work surface for shaping hot metal
Why use anvil's cutting table for chiselling?
Why use anvil's cutting table for chiselling?
To avoid damaging hardened face & tools
Drawing down in forging
Drawing down in forging
Reduces cross-sectional area while increasing length
Mean diameter formula
Mean diameter formula
Material length for circular shape
Material length for circular shape
Effect of hardening on high carbon steel
Effect of hardening on high carbon steel
Makes it very hard but brittle
Hardening temperature (colour)
Hardening temperature (colour)
Cherry red (approx. 750°C)
Purpose of tempering
Purpose of tempering
Reduces hardness to improve toughness
Tempering colour & temp for cold chisels
Tempering colour & temp for cold chisels
Dark straw (240°C)
Purpose of annealing
Purpose of annealing
Softens metal & relieves internal stresses
Purpose of normalising
Purpose of normalising
Refines grain structure & removes stresses
Annealing vs normalising difference
Annealing vs normalising difference
Cooling rate: annealing slower, normalising in air