• To Monitor And Control - Internal Rejections.
  • To Monitor And Control - Customer Complaints.
  • To Ensure Proper Housekeeping

Process

Investment casting is an industrial process based on and also called lost-wax casting, one of the oldest known metal-forming techniques. From 5,000 years ago, when beeswax formed the pattern, to today's high-technology waxes, refractory materials and specialist alloys, the castings allow the production of components with accuracy, repeatability, versatility and integrity in a variety of metals and high-performance alloys.

The process is generally used for small castings, It is generally more expensive per unit than die casting or sand casting, but has lower equipment costs. It can produce complicated shapes that would be difficult or impossible with die casting, yet like that process, it requires little surface finishing and only minor machining.

Advantages of Investment casting

Many Intricate forms with undercuts can be cast. A very smooth surface is obtained with no parting line. Dimensional accuracy is good. Certain unmachinable parts can be cast to preplanned shape. It may be used to replace die-casting where short runs are involved.

End User Postion

The PROCESS in Brief

Wax Preparation

Wax patterns are produced by using various type of industrial wax. Every wax has their own quality parameters like melting point, congealing point and ash content. When it becomes ready to us it is being transferred to the wax tank of injection machine.

Wax pattern injection

The melted wax being injected into moulding tool to get desired shape and dimensions. Wax pattern should comply all the aesthetic and dimensional requirements to qualify next process.

Wax pattern Assembly

The wax patterns are associated with gate, runner, cup and struts depends upon complexity of part. After having complete inspection of wax pattern the wax pattern would be assembled like a tree.

Ceramic Coating

A wax pattern tree would be dipped in slurry and a very fine sand coat is being applied. Balance coats applied with difference refractory at the identified intervals.

De-waxing

Once Coated ceramic shell achieve the strength the inner wax would be removed by boiling the shells.

Melting

After preheating of shells the metal would be poured with the usage of ladles. Chemical composition, shell temperature, pouring temperature, pouring speed, purity of metal, etc. are very crirical parameters to be controlled.

Knockout & Fettling

After performing metal pouring the ceramic structure is being removed with hydraulic vibrator machine. Parts being separated from gate and runners. Extra materials on castings being removed during fettling.

Heat Treatment

Mechanical properties can be maintained by this process same should monitored according to standard requirement. Cycle time, soaking time, cooling method and media are main aspects to get desired quality.

Shot Blasting/Sand Blasting

This will improve aesthetic aspect of casting it is also helping to identify visual defects on casting.

Packing & Dispatch

This is the last process to achieve customer satisfaction. Packing would be done according to the different requirements of concern customer.