Sand Casting Post-Processing& CNC Machining

What is Post-Sand-Casting Machining?

Post‑sand‑casting machining involves CNC processing of as‑cast sand‑cast parts to achieve precise dimensions, improve surface quality, and add functional features such as bolt holes, sealing surfaces, threads, and precision mating interfaces. Sand casting is ideal for producing large, complex, or low‑volume metal parts with good structural integrity; subsequent CNC machining ensures the part meets tight tolerances and assembly requirements. This combined process is widely used in heavy machinery, pumps, valves, automotive, marine, and construction equipment.

Our Capabilities in Machining Sand-Cast Components

We specialize in machining various sand‑cast materials, from cast iron and steel to aluminum and copper alloys. Our shop is equipped with heavy‑duty CNC mills, lathes, and boring machines capable of handling large, irregularly shaped castings with consistent precision and stability.

From Sand Casting to Finished Part

Submit your casting drawing or sample for a manufacturability analysis. We provide DFM suggestions to optimize both the casting design and machining setup for cost efficiency and quality.

Common Sand‑Cast Materials We Machine

▪ Cast Iron: Gray Iron (GG25, GG30), Ductile Iron (GGG40, GGG50)

▪ Cast Steel: Carbon Steel, Low‑Alloy Steel

▪ Cast Aluminum: A356, A380, ZL101, ZL104

We can source cast blanks or machine your supplied castings.

Finishing & Surface Treatment Options

▪ Shot/Sand Blasting

▪ Grinding & Deburring

▪ Primer & Industrial Painting

▪ Galvanizing / Zinc Plating

▪ Anti-Rust Oiling / Phosphating

▪ Precision Machining of Sealing Surfaces

CNC Machining Service

At Xinchenda Metal, we use advanced equipment to offer you a variety of CNC machining services including CNC Machining,CNC Milling,CNC Turning,5-Axis CNC Machining Service,Swiss-type CNC Machining Services,Surface Finishing,Parts Assembly Service and much more. Using our imported 3, 4 and 5-axis CNC machining centers, our skilled machinists can make turned and milled parts using a wide range of plastic and metal materials.

From Concept to Production

We support your project from initial design to final part delivery. Upload your drawings to start a free project review and receive expert DFM feedback.

Available Materials

▪ Metals: Steel, aluminum, stainless steel, brass, copper, and more

▪ Plastics: Acrylic, PC, PEEK, PEI, Nylon, PP, PVC, and other engineering grades
Contact us for full material specifications

Advantages of CNC Machining

▪ High accuracy and repeatability

▪ Low tooling investment

▪ Broad material compatibility

▪ Efficient material removal

▪ Cost-effective for prototypes to mid-volume runs

▪ Fast turnaround and scalable production

Surface Finishing Options

We provide a range of finishes to meet aesthetic and functional requirements, including anodizing, painting, bead blasting, polishing, pad printing, and custom color matching.