High Precision Investment Casting

Often called the "lost wax process", can be traced back over 4,000 years when ornaments and jeweler were cast using beeswax for patterns., Investment Casting and other casting methods are now the dominant globally applied methods to produce precision parts. Today's advanced technology allows the production of parts in high volume with extraordinary precision. An essential element to Investment Casting other than production equipment is the skills and experience of the technicians and engineers. High Precision Investment Casting can produce products near net shape that require little or no rework, saving time and money over competing methods.

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.

7) Post Processing

Heat Treatment
Blasting
Picking