Often called the "lost wax process", a process
can be traced back to the old world craftsmen,
Investment Casting and other casting methods are
the dominant and globally applied methods to
produce precision parts. Today's technological
advances allow the production of parts in high
volume with extraordinary precision. An
essential part to Investment Casting other than
production equipment is the skills and
experiences of the technician and engineers.
1) Wax Model
A master production wax impression mold
is
made to precise specifications.
From this
very beginning process-wax
injection –we check the patterns
and inspect every wax model, to ensure that they
will meet the customer’s
requirement
2) Shell Molding
Specially formulated hot liquid or paste
wax is injected into the mold and
allowed to harden into an exact replica,
or pattern, of the finished metal part. Multiple wax patterns are
ganged together on a single expendable
wax sprue.
The sprues are then repeatedly dipped in
ceramic slurry, coated with refractory
sand, and allowed to dry in a
temperature and humidity controlled
environment.
We strictly control
the environment condition and process
method to ensure the quality of the
shell.
3) Dewaxing
Remove the Steel Bone
Dewaxing: Arrange the
wax pattern, put mold into steam
boiler to melt the wax;
Wax Recycling
4) Sintering
The shells (molds) must be fired to burn out the last traces of pattern material,
Remove any moisture, bring shell to
fired strength, proper
temperature, and aid in fluidity
for thin sections. Shells are
fired to temperature designated
by part design and alloy
selection.
5) Melting and pouring
Fast melting induction furnace protect the material from oxidization.
Inspection Ladle analysis for each melt can ensure the chemical analysis of the castings to meet the specification. We Keep the samples for 6 months and records for more than 7 years to make it available to the chemical analysis.
6) Cutting
After the poured
(molten) metal has cooled, the
shell (mold) material is removed
from the casting cluster (tree)
using high pressure water,
vibratory or shot blast methods. The
individual castings are removed
(cut-off) from the cluster (tree).Remaining
protrusions left by gates or
runners, are removed by
grinding. Generally the castings
are shot, sand or bead blasted
for a smoother finish.
