Shubh Mangal Techno

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Our Investment Casting Process – Precision at Every Stage

At Shubh Mangal Techno, we follow a highly accurate and efficient investment casting process that ensures superior quality, precision, and repeatability across every product.

1. Die Manufacturing with CAD/CAM Technology

We begin by designing and producing Dies (Patterns/Tools) using state-of-the-art CAD/CAM systems. This guarantees the highest level of dimensional accuracy for each wax pattern.

2. Wax Injection and Pattern Formation

Our team produces wax patterns from Dies, each undergoing 100% dimensional inspection to ensure consistency. These patterns are assembled into clusters (trees) in preparation for shell building.

3. Ceramic Coating Process

Wax trees are coated with high-quality ceramic slurry in climate-controlled rooms, ensuring a fine surface finish and exceptional dimensional accuracy during the metal casting stage.

4. De-waxing and Shell Baking

Once dried, the ceramic moulds undergo de-waxing in hot water or steam autoclaves. They are then baked at high temperatures (900°C to 1150°C), strengthening them for the molten metal pour.

5. Metal Pouring and Solidification

We pour molten metal into the ceramic moulds, forming the final investment castings with precision. Our strict quality controls guarantee metallurgical excellence.

6. Finishing Operations

After casting, the components undergo finishing processes such as:

  • Gate Cutting

  • Machining

  • Sand & Shot Blasting

  • Leaching and Deburring

We also provide passivation, electro-polishing, blackening, powder coating, and glass bead blasting.

7. Heat Treatment

Our heat treatment process is fully documented and calibrated, optimizing hardness and mechanical properties to meet client-specific requirements.

8. Final Inspection & Packaging

Each casting goes through a 100% visual inspection, and critical dimensions are re-verified before final packaging. We also offer castings in a fully machined condition.

 Trust Shubh Mangal Techno – Your Partner in Precision Casting

We blend technology, craftsmanship, and quality assurance to deliver reliable, high-performance industrial castings across industries.

Learn more about investment casting process

1. Wax Injection

The process starts with producing a heat-disposable pattern, typically created by injecting wax into a metal die or mold. This is done using a Horizontal Automatic Injection Machine. A water cooling system is integrated to minimize cycle time and ensure precise dimension control of the pattern. For even tighter dimensional accuracy, pattern resting gauges are employed.

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 process involves dipping the assembly into a ceramic slurry, followed by a fine sand coating. This cycle is repeated 4 to 6 times, with each layer air-dried under controlled conditions, maintaining a temperature between 22–26ºC and optimal humidity levels. To enhance efficiency, organic fiber is added to the secondary slurry bath, reducing cycle time and the number of coats required. This also improves the permeability of the shells, ensuring better results.

4. Dewax Operation

Once the shell is completed, it is placed in a steam autoclave where the wax pattern melts and exits through the gates and pouring cup. The autoclave de-waxing process preserves the quality of the wax, offering superior results compared to conventional de-waxing methods.

5. Shell Pre Heating

The ceramic shell molds are fired to remove any remaining pattern material and preheat them for casting, typically at temperatures ranging from 800°C to 1100°C. At Shubh Mangal Techno, we use a rotary hearth furnace equipped with three burners, allowing for precise temperature control throughout the shell firing process.

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. Fettling

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.

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.