Lost Wax Investment Casting Process
Design the tooling according to customs’ drawing or sample, set up
the pouring system with CAE casting simulation software.
Transfer the drawing or sample into 3D drawing which is applied to
aluminum or steel mould fabrication.
Mix liquid wax slurry and solid wax together, inject wax into metal
mould, fetch it out after cooling.
Wax Mold Assembly
Heat the stainless steel welding knife, weld the wax molds together
on the gate stick according to technically designed.
The wax molds are dipped into water glass solution, with surface
coated by the solution.
Stucco the dipped wax molds with quartz sand, then dip into
induration solution containing ammonium chloride & magnesium
chloride and hang to dry. The whole process repeats 6 times.
Put the thick coated wax molds into wax removal gutter, keep
heating. After lost all the wax only sand shell was left.
Sand Shell Preheat
Heat the sand shell in order to strengthen the shell.
Put the raw material into the induction furnace and melt, add with
chemical composition per material spec. After the temperature of
molten steel rises to about 1600 degrees, take a pre-pouring
chemical analysis, if approved then pour liquid steel into the sand
shell by ladle, make sure the shell is filled with liquid steel and
then cool off, meanwhile take the testing bar for after-pouring
Sand Shell Removal
Make the casting free from sand by shaking.
Oxyacetylene cut off the castings from gate stick.
Grind the ingate and defected surface with grinding wheel.
Heat treat the casting by normalizing, annealing, quench tempering,
induction quenching, case hardening and nitriding per material spec.
Machine the castings by CNC according to drawing spec.
Test the parts’ mechanical properties by tension tester, impact
tester, hardness tester, take NDT with X-ray, UT and M.P.T, final
dimension inspection are down by CMM, Measures & Gauges, etc.
Pack & Transport
After rust prevention, pack the parts into plywood or iron case for