Process Gallery
The Process begins with production of a heat disposable pattern. This pattern is usually made by injecting wax into a metal die or mold. Pattern is injected in Horizontal Automatic Injection Machine. Water Cooling system is provided to reduce cycle time and to achieve dimension control of Pattern. For very close dimension control pattern resting guages also used.
The wax patterns are attached by the gate to a central wax runner system. The runner system is called a sprue. Patterns, runners, and pouring cup compromise the cluster or tree. Radius is provided to all joints between pattern and runner. Same checked thoroughly before coating to avoid rejection due to sand inclusions.
The shell building technique involves dipping the assembly into a ceramic slurry and then into a bed of extremely fine sand. After drying, the process is repeated. Up to 4 to 6 layers may be applied in this manner. All shell dried in Air Conditions in close range of temp. (22-26 C) & humidity. We also used Organic Fiber in secondary slurry bath to reduced cycle time and no. of coats. It also helps in improvement of permeability of shells.
Completed shell is placed in a steam autoclave where the pattern melts and runs out through the gates and pouring cup. Auto clave dewaxing operation maintain quality of wax compare to convensonal dewaxing process.
