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Investment Casting & CNC Machining for Complex Impellers

Investment Cast Impeller with Complex Curved Blades

Impellers often combine multiple curved blades, a central hub and critical mounting or shaft interfaces within a compact rotating component.

Silica sol investment casting allows complex blade geometry to be formed close to the final shape while maintaining an integrated one-piece structure.

After casting, critical functional areas such as the center bore, hub surfaces and locating interfaces can be CNC machined according to drawing requirements.

Typical machined features include:

• Center bore

• Hub surfaces

• Shaft connection interfaces

• End faces

• Locating surfaces

• Keyways or slots where required

• Threaded features where required

• Other critical interfaces

Key Product Features

① Complex Curved Blade Geometry

Curved blades and flow surfaces can be formed directly through investment casting, allowing complex impeller geometries to be produced with reduced machining of the blade profile.

② Integrated One-Piece Structure

Blades, hub and surrounding structural features can be incorporated into a single casting, reducing the need for separately manufactured and assembled sections.

③ CNC Machined Hub & Bore

Center bores, hub surfaces and other shaft or assembly interfaces can be CNC machined according to drawing tolerances.

④ Consistent Blade Geometry

Blade profile, thickness, spacing and overall geometry can be inspected according to approved drawings and project requirements.

⑤ Steel Material Options

Stainless steels and alloy steels can be selected according to corrosion resistance, mechanical properties, operating environment and customer specifications.

⑥ Custom Manufacturing from Drawings

Blade geometry, hub dimensions, material grade, machining requirements and inspection criteria can be manufactured according to customer drawings and technical specifications.

From Investment Casting to Finished Impeller

01 Engineering Review

Review 2D drawings and 3D models, including blade geometry, hub structure, wall thickness, machining allowances, casting feasibility and critical interfaces.

02 Tooling & Wax Pattern Production

Tooling is manufactured according to the approved casting design, followed by wax pattern production and dimensional inspection.

03 Silica Sol Investment Casting

Curved blades, hub structures and integrated flow features are produced using silica sol investment casting.

04 Casting Cleaning & Finishing

Gates and feeding systems are removed, followed by cleaning, grinding and surface preparation.

05 CNC Machining

Center bores, hub surfaces, shaft interfaces, end faces and other critical functional features are machined according to the drawing.

06 Dimensional & Material Inspection

Finished impellers are inspected for critical blade geometry, machined features, casting condition and material conformity before shipment.

Stainless & Alloy Steel Options for Impeller Castings

Material selection depends on corrosion conditions, mechanical loading, operating environment, fluid media and the customer's engineering specification.

• 304 / 304L Stainless Steel

• 316 / 316L Stainless Steel

• 410 Stainless Steel

• Duplex Stainless Steel where required

• Alloy Steel according to specification

Casting & Machining Capabilities

For custom impellers and similar rotating flow components, Zeren can provide:

• Silica sol investment casting

• Complex curved blade casting

• Integrated hub and blade casting

• CNC milling

• CNC turning

• CNC drilling

• Bore machining

• Hub machining

• Keyway machining where required

• Bead blasting

• Passivation where required

• Heat treatment where required

• Dimensional inspection

• Material verification

• First Article Inspection upon request

Inspection Focused on Blade Geometry & Rotating Interfaces

For impellers and similar rotating components, dimensional consistency is particularly important around blade geometry, center bores, hub dimensions and shaft connection interfaces.

Typical inspection items include:

• Blade profile and dimensions

• Blade thickness

• Blade spacing

• Center bore diameter

• Bore position

• Hub dimensions

• Machined surface dimensions

• Critical wall thickness

• Casting surface condition

• Material composition

• Overall dimensional conformity

Depending on project requirements, inspection can include:

CMM measurement / 3D scanning / spectrometer analysis / hardness testing / dimensional reports / First Article Inspection

Typical Applications

Custom investment cast impellers and similar rotating flow components can be used in:

• Industrial pumps

• Fluid handling equipment

• Chemical processing equipment

• Water treatment equipment

• Industrial machinery

• Rotating equipment

• Mixing and circulation systems

• Custom flow-control assemblies

Impellers often contain curved blades and integrated flow surfaces that are difficult to produce economically through conventional machining alone.

Investment casting allows complex blade geometry to be formed close to the final shape while maintaining an integrated casting structure.

• Complex curved blade geometry

• Integrated blade and hub structures

• Near-net-shape production

• Reduced machining of blade surfaces

• Consistent repeat production

• Good surface quality for cast flow passages

• Suitable for customized small-to-medium volume production

Critical bores, hub surfaces and shaft interfaces can subsequently be CNC machined to meet assembly and dimensional requirements.

Need an Investment Cast Impeller Made to Your Drawing?

Send us your:

2D drawing / 3D model / material specification / quantity / machining requirements

Our engineering team can review:

casting feasibility / blade geometry / hub structure / machining allowances / tolerances / inspection requirements

before quotation and tooling.