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CF8M Stainless Steel Neck Flange with Internal Support

YTD supplied this custom CF8M neck flange with its internal support cast into the body and its assembly surfaces, mounting holes and central through-bore machined.
cf8m stainless steel neck flange
Material
CF8M Stainless Steel
Casting Process
Silica Sol Investment Casting
Construction
One-Piece Casting
Supply Scope
Casting and Machining

Complexity Inside the Component

An inward-projecting rim, recessed support ribs and a hollow central sleeve make the internal geometry the defining manufacturing challenge of this part.

Product Views

Click any image to enlarge.

Tapered Body

The neck profile and wide mounting flange viewed from the narrow end.

Internal Support

The central platform and three connecting ribs, recessed behind the flange mounting face.

Customer Requirements & YTD’s Approach for Neck Flange

Customer requirement
YTD’s approach
Customer requirement

An integrated internal structure

The component required its outer body and internal support to form a single CF8M part.
YTD’s approach

Produce the complete structure by investment casting.

YTD used silica sol investment casting to incorporate the internal support into the body, with wax-pattern tooling developed around the restricted cavity geometry.
Customer requirement

Machining included in the supply

The delivery scope included finished assembly surfaces and connection features on both ends and within the body.
YTD’s approach

Complete the assembly machining after casting.

YTD machined the external interfaces and recessed internal features, supplying the component with the required machining completed.

Forming a Cavity with Restricted Core Removal

The narrow-end rim projects into a larger internal cavity. A single rigid core matching that cavity cannot pass straight through the smaller opening. At the opposite end, the three ribs and central platform also obstruct a direct axial withdrawal path.

These restrictions made internal cavity formation and wax-pattern release central to the tooling design. The tooling had to reproduce the enclosed profile and connected support structure while allowing the wax pattern to be released without damage. Resolving this at the wax-pattern stage enabled the complete geometry to be carried through into the CF8M casting.

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Machining Stepped Interfaces and Recessed Features

The large end contains three distinct levels: the annular ring stands above the flange mounting face, while the support ribs sit below it. YTD machined the mounting interface and its six holes, finished the central platform face, and produced one threaded hole in each rib.

At the narrow end, machining covered the complete end face and curved annular groove. The central sleeve’s through-bore was also machined. Together, these operations completed the component’s assembly features across both ends and inside the body.

Inside Our Factory

Explore the tooling, casting and machining facilities behind YTD’s custom component production.
YTD Foundry - Investment Casting Foundry in China
Integrated Production Facility
CNC Machining Center
Slurry Coating
Investment Casting Foundry - YTD Foundry
Casting Workshop
Mold Machining
Casted Mold
Steel Mold
Aluminum Mold
CNC Machined Mold
Wax Injection
Slurry Coating
Shell Drying
Dewaxing
Investment Casting Foundry - YTD Foundry
Melting & Pouring
Triming
Post Processing
CMM/Hardness/Spectrometer Test
Wax Pattern Check
Wax Pattern Trimming

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Have a Casting with Complex Internal Features?

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