Shot Blasting in Investment Casting

Shot blasting is a common cleaning process after shell removal and cutting in the investment casting process. It is used to remove ceramic shell residue, oxide scale, sand marks and surface impurities from casting parts.

This process helps improve the surface condition of stainless steel, carbon steel and alloy steel castings before grinding, surface treatment and final inspection.

What Is Shot Blasting?

Shot blasting uses high-speed steel shots or abrasive media to clean the surface of casting parts. The abrasive media hits the casting surface and removes loose shell material, oxidation and surface contamination.

After shot blasting, the casting surface becomes cleaner and more uniform. This makes it easier to check surface defects and prepare the parts for the next process.

Why Shot Blasting Matters

After investment casting, the surface of the casting may still have ceramic shell residue, oxide layer or rough areas. If these are not removed properly, they may affect later grinding, polishing, passivation, coating or inspection.

Shot blasting helps expose the real surface condition of the casting. It also helps workers find visible defects such as cracks, pits, shrinkage marks or surface damage.

For industrial casting parts, shot blasting is an important step before final finishing.

Process Control

During shot blasting, the blasting time, media type and cleaning strength should be controlled according to the material, part structure and surface requirement.

If the blasting is too weak, shell residue or oxide scale may remain. If the blasting is too strong, thin-wall areas, sharp edges or small details may be damaged.

For parts with holes, grooves or complex shapes, the cleaning process should make sure that hidden areas are also properly cleaned.

Senjia Casting Process Control

At Senjia Casting, shot blasting is arranged according to part material, structure and customer surface requirements. We focus on complete surface cleaning, stable appearance and preparation for further processing.

After shot blasting, parts may go through grinding, polishing, passivation, pickling or other surface treatment according to the drawing and order requirements.

Conclusion

Shot blasting is an important post-casting cleaning process. It removes shell residue, oxide scale and surface impurities, and prepares casting parts for finishing and inspection.

Senjia Casting provides silica sol lost wax casting services for stainless steel, carbon steel and alloy steel parts. If you need custom investment casting parts, please send us your drawings, material grade, quantity and surface treatment requirements.