PROCESS


  • The Dies (Patterns/Tools) are manufactured using latest CAD/CAM facilities.
  • INFINITY CAST also provides technical support to its customers to develop cost saving and more efficient products.
  • Injection and production of wax pattern from Dies (Patterns/tools). All Wax patterns are 100% dimensionally checked.
  • The Wax pattern after forming the tree or cluster undergoes the ceramic coating process. This process is done in temperature and Humidity controlled rooms, so that best dimensional accuracy and excellent surface finish is achieved.
  • After completing the coating process, the wax is removed by de-waxing process, which is done by putting the ceramic mould in the hot bath of wax.
  • The Ceramic moulds are baked at temperature ranging from 900°C to 1150°C depending on the geometry and size of the casting. The molten metal is then poured in the baked ceramic moulds.
  • The casting then undergoes fettling and finishing process such as Gate Cutting, Gate Machining / grinding, Sand Blasting, Shot Blasting, Leaching, Deburring etc.
  • The coating then undergo the Heat Treatment as Per the material specifications.
  • Heat Treatment graphs are cycles are recorded and documented.
  • Heat Treatment furnace is calibrated and certified by LLOYDS REGISTER OF SHIPPING.
  • All castings are subject to 100% visual inspection.
  • All critical dimensions are 100% inspected before packing and shipment.
  • INFINITY CAST can also supply castings in machined condition.
  • Castings can be also supplied with various type of finishing such as passivation, Electro-polishing, Blackening, powder coating, shot blasted, Glass bead blasted.

1. Wax Injection

 

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 gauges also used.

2. Pattern Assembly

 

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.

3. Shell Building

 

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 – 26º 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.

4. Dewax Operation

 

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.

5. Shell Pre Heating

 

The ceramic shell molds must be fired to burn out the last traces of pattern material and to preheat the mold in preparation for casting, usually in the range of 800 to 1100 degrees centigrade. INFINITY CAST use rotary hearth furnesh with three burners which gives very much close control in shell temperature.

6. Metal Pouring

 

The preheated shell is filled with molten metal by gravity pouring. As the metal cools, the parts, gates, sprue, and pouring cup become one solid casting.

7. Gate/Riser Cutting

 

After the metal solidifies and cools, the ceramic shell is then removed by vibratory methods or water blasting.

8. Heat Treatment

 

Casting to be shot Blasted to remove all small ceramic particles. Amtech also can supply casting with glass bead blasting or sand blasting if customer require.

9. Shot Blasting

 

Individual casting are removed from the cluster by means of a cut off wheel or weld cutting.

10. Finishing Operation (Gate Grinding)

 

Remaining gate protrusions are removed by belt grinding.

11. Final Casting Inspection

 

Casting is Heat Treated as per Specifications in 1 ton. capacity heat treatment furnace. Same has been calibrated as per standard APA 6 A.

12. Machining

 

Finally casting is dimensionally and visually inspected, packed as per customer specification and dispatched. Before Despatch All testing to be done like Die Penetrate Test, Magnetic Particle Test, Radiography Test etc. based on customer specification.

13. Final Inspection