Hello friends,
This is my first blog post. Today I am giving you information
about the investment casting cycle. Many of the products produced from this
process are used in many industrial place like in Aeronautical and
Aircraft Components, medical implants, Automotive-Diesel-Engine-&-Generator-Parts,
defense, Engineering, Marine Hardware, pumps
and valves, automobile sector, turbine blades, in fabricated items etc. Investment
casting is lost wax cycle or wax preparation cycle. In short, the wax is
melted and casting is done. Toady i will cover all points, There are
mainly 5 division in investment casting foundry.
1) Die Shop Department
2) Press Dept. (Cleaning, Repairing and Assembly included)
3) Coating Dept.
4) Dewaxing Dept.
5) Melting Dept.
6) Hammering and Knockout Dept.
7) Fetteling and Finishing Dept.
8) Dispatch Dept.
1) Die Shop Dept.
This is first division if this cycle. generally this
division is covered in CAD/CAM branches.
Some foundries are make die inhouse, first of all, all dimensions are check according to the final product and very crucial is shrinkage allowence, generally for the ferrous and non ferrous casting has 2.5% shrinkage calculated , it means 0.7 to 0.8 % is wax shrinkage and 1.5 to 1.8% is casting shrinkage.
Some foundries are make die inhouse, first of all, all dimensions are check according to the final product and very crucial is shrinkage allowence, generally for the ferrous and non ferrous casting has 2.5% shrinkage calculated , it means 0.7 to 0.8 % is wax shrinkage and 1.5 to 1.8% is casting shrinkage.
For example, If your product dimension is 100mm
Than die
dimension is 102.5mm. we will discuss in brief that how to make dies and mould
in future.
2) Wax or Press Dept.
In this
dept wax is injected in die by press machine. This division is fully
covered by the air conditioning system because of to maintain wax dimensions.At
the normal temp wax pattern loose its shape and destroy its
dimensions. When the Wax pattern emits from the die, it shows the some
parting line effect of the Die.
It is removed from a special knife. And it is
being repaired from the repairing wax. The wax pattern is combined with a
solid wax bar in the assembly room. you can understand by this image.
 |
| Wax Tree Assembly |
3) Coating Dept.
In this
department, from the small sand to the wax tree, the level of large sand is
adorned. And it's called a shell(Mold). This mold is kept in
temperature of 17 to 18 degrees. This process is about 2.5 to 3 days.
 |
| Coating |
4) Dewaxing Dept.
The wax
is removed from the mold in this department. Hanging the mold in a tank,
it is heated from 190 to 200 degrees and the wax flips out of the liquid
form.
The
liquid form of the vacuum was then re-sent to the wax department and
reused.That's why this process is also called Lost wax method Casting.
5) Melting Dept.
The
ferros or non ferrous metal is heated from 1700 to 1800 degree temp. at
this temp the metal is comes from solid form to liquid form.
When the
liquid is sown in metal and powdered in the mold, it is usually kept for a
while until it becomes again in solid form.
 |
| Melting(Pouring) |
6) Hammering and Knockout Dept.
After
melting this mold is broken by the hammering and knockout process. So the sand
is removed and the casting tree is ready.
7) Fetteling and Finishing Dept.
The main casting product is separate from the casting tree and it
will be finish by different type of finishing operation
