Metal Processes Flashcards
advantages of low pressure die casting?
Complex shapes can be created with very good 3D dimensional accuracy.
Die casts can be produced at very high rates in mass production.
Die casting provides quality, durable and aesthetic items which last for long periods of time.
There is lots of choice of metals and alloys for this process so it is very versatile.
disadvantages of low pressure die casting?
The costs for the lies are extremely expensive and the tooling costs are very high.
A large capital investment in needed to begin the process
The dies are very complex and require trained professionals to operate them
The items produced by die casting can sometimes be slightly porous sue to the entrapped gas with high pressures so they cannot be least treated.
step by step of low pressure die casting?
The mould is prepared with lubricant
The molten metal is poured from the crucible to the cavity.
The molten metal cools down
The metal is ejected
Shakeout where scrap metal is removed
Item has a further finish applied.
Step by step of Lost wax Casting?
The wax is cut and shaped to the desire shape of the metal
The base and sprues are now attached to the wax model
The investment powders now added to water and poured around the wax cast
It is then put into a vacuum chamber
The wax is then melted out of the centre, and molten metal is poured in.
The sides are then opened and quenched.
Advantages of Lost wax Casting?
Complex shapes canes created with very good 3D dimensional accuracy.
The invest powders are cheap which makes the moulds cheap and the tooling cost is low.
The process is fast and produces accurate products.
There is lots of choice of metals and alloys for this process so it is extremely versatile.
Disadvantages of lost wax casting?
If the wax mould is not perfect, or it does not all escape, the product is not perfect.
The process itself limits itself to smaller products.
The wax sculpting requires skilled individuals.
The process itself requires a lot of time and cannot be mass produced.
Step by step of high pressure die casting?
The mould is prepared with lubricant
The molten metal is poured from the crucible to the cavity.
The molten metal cools down
The metal is ejected
Shakeout where scrap metal is removed
Item has a further finish applied.
advantages of high pressure die casting?
Complex shapes can be created with very good 3D dimensional accuracy.
Die casts can be produced at very high rates in mass production.
Die casting provides quality, durable and aesthetic items which last for long periods of time.
There is lots of choice of metals and alloys for this process so it is very versatile.
Disadvantages of high pressure die casting?
The costs for the lies are extremely expensive and the tooling costs are very high.
A large capital investment in needed to begin the process
The dies are very complex and require trained professionals to operate them
The items produced by die casting can sometimes be slightly porous sue to the entrapped gas with high pressures so they cannot be least treated.
Step by step Sand casting?
Place a pattern in sand to create a mould.
Incorporate a pattern and sand in a gating system.
Remove the pattern
Fill there mould cavity with molten metal.
Allow the metal to cool.
Break away the sand mould.
Advantages of sand casting?
The production process for sand casting is very simple and takes little time to complete.
The casting moulds are inexpensive, so the tooling costs are low
The production costs are low, particularly because of what is mentioned above
There is also a wider choice of metals, as lots of alloys can be used and heated to the right state to be casted.
Disadvantages of Sand Casting?
The products made often have a poor surface quality.
The products often have low dimensional accuracy as they tend to shrink.
The moulds are low-strength and cannot be re-used
The moulds made are versatile and can be scaled up to make very large products
