What Does a Metal Foundry Do?

A metal foundry converts molten metal into engineered components through a controlled casting process.

For OEM buyers, however, a foundry is not simply a place where metal is poured into molds. The quality of the finished casting depends on decisions made before production begins, including material selection, casting process, part design, tooling, gating and risering, machining allowance, dimensional requirements, and inspection criteria.

This is why choosing a metal foundry should not be based only on the quoted casting price.

The more important question is:

Can the foundry consistently manufacture the component to the engineering requirements of the final application?

For custom industrial parts, we work from the customer's actual requirements rather than selling a fixed catalog of standard castings.

You can provide:

• 2D engineering drawings

• 3D CAD files

• Physical samples

• Material specifications

• Technical standards

• Annual or batch quantities

• Machining requirements

• Surface treatment requirements

Our engineering and production teams can then evaluate the appropriate manufacturing route.

Is Metal Casting Suitable for Your Part?

Not every metal component should automatically be manufactured by casting.

The right process depends on the geometry, material, quantity, dimensional requirements, and application.

Casting can be a practical option when your component has:

• Complex external geometry

• Ribs or integrated supports

• Internal cavities

• Irregular shapes

• Large cross-sections

• Multiple structural features

• Repeated production requirements

• A need to reduce machining from solid material

For example, a machine housing containing ribs, mounting structures, and internal cavities may be more efficiently produced as a casting followed by machining of critical surfaces.

By contrast, a simple low-volume component with very tight dimensions may require a different manufacturing approach.

Our recommendation is therefore to evaluate the part first rather than automatically selecting a casting process.

This application-first approach can help buyers avoid unnecessary tooling, machining, and production costs.

Metal Casting Processes We Can Evaluate

Different casting processes are suitable for different component designs.

The appropriate process depends on the part rather than simply the name of the process.

Sand Casting

Sand casting is commonly considered for industrial components with relatively complex geometry, larger dimensions, or production requirements where tooling economics are important.

It can be suitable for:

• Machine housings

• Brackets

• Structural components

• Bases

• Covers

• Flanges

• Industrial machinery components

For many industrial OEM projects, sand casting provides a practical balance between design flexibility and production cost.

Investment Casting

Investment casting can be considered when a component requires more detailed geometry and improved casting accuracy compared with conventional sand casting.

Potential applications include:

• Small mechanical components

• Complex brackets

• Detailed fittings

• Precision industrial components

• Components with difficult-to-machine geometry

The suitability of investment casting should be evaluated according to the actual component design and production quantity.

Lost Foam Casting

Lost foam casting can be considered for certain complex-shaped components where conventional pattern and molding approaches may create additional design or tooling challenges.

It can be particularly interesting when the component contains:

• Complex cavities

• Irregular geometry

• Integrated structural features

• Reduced parting-line requirements

The process should be selected based on the component geometry and required production performance.

Materials for Custom Metal Castings

Material selection should start with the working conditions of the component.

Important factors may include:

• Mechanical loading

• Impact

• Vibration

• Wear

• Temperature

• Corrosion exposure

• Required machinability

• Dimensional requirements

Depending on the project, materials may include the following.

Gray Iron

Gray iron can be suitable for components requiring good machinability, vibration damping, compressive strength, and dimensional stability.

Typical applications may include:

• Machine bases

• Housings

• Covers

• Brackets

• Industrial equipment components

Ductile Iron

Ductile iron can provide higher strength and toughness than conventional gray iron and may be considered for components subjected to greater mechanical loads or impact.

Typical applications include:

• Mechanical housings

• Structural components

• Machinery parts

• Automotive-related components

• Agricultural machinery components

Carbon Steel

Carbon steel can be considered for components requiring strength and toughness according to the applicable material specification.

The appropriate grade should be determined from the customer's engineering requirements and actual application.

Stainless Steel

Stainless steel can be considered where corrosion resistance is an important requirement.

The appropriate stainless-steel grade depends on the working environment, temperature, chemical exposure, mechanical requirements, and applicable specification.

How We Help You Select the Right Casting Solution

One common mistake in casting procurement is deciding on the process before reviewing the component.

Instead, we recommend evaluating the part in this order:

1. Application

What does the component do?

2. Loading Conditions

Will it experience:

• Static load?

• Impact?

• Vibration?

• Repeated loading?

• Wear?

3. Material

What mechanical and environmental properties are required?

4. Geometry

Does the part contain:

• Cavities?

• Ribs?

• Holes?

• Thin sections?

• Thick sections?

• Complex surfaces?

5. Production Quantity

Is it:

• Prototype production?

• Small batch?

• Medium volume?

• Long-term repeat production?

6. Machining Requirements

Which dimensions actually need tight control?

7. Surface Requirements

Does the finished component require:

• Shot blasting?

• Painting?

• Powder coating?

• Anti-corrosion treatment?

• Other specified finishing?

This process helps move the conversation from "How much does casting cost?" to "What manufacturing solution is appropriate for this component?"

Custom Metal Foundry Services From Drawing to Finished Part

Our OEM workflow can cover multiple stages of the manufacturing process.

Step 1 — Drawing & Application Review

Send us your:

• 2D drawing

• 3D CAD model

• Physical sample

• Material specification

• Quantity requirement

We review the component geometry and manufacturing requirements.

Step 2 — Casting Process Evaluation

The proposed manufacturing route is evaluated according to:

• Material

• Geometry

• Production quantity

• Dimensional requirements

• Machining requirements

• Surface treatment

• Application conditions

Step 3 — Pattern & Tooling Development

For projects requiring casting tooling, the pattern and tooling solution is developed according to the approved component design.

The tooling approach can affect:

• Initial tooling investment

• Casting consistency

• Production efficiency

• Parting lines

• Machining allowance

• Long-term production stability

Step 4 — Prototype / Sample Production

Where required, samples can be produced before regular production.

This provides an opportunity to verify:

• Dimensions

• Fit

• Machining requirements

• Surface condition

• Material requirements

before proceeding with larger production quantities.

Step 5 — Metal Casting

The specified material is melted and processed according to the agreed manufacturing requirements.

Key production stages may include:

Melting → Chemical Composition Control → Mold Preparation → Pouring → Solidification → Shakeout → Cleaning

Step 6 — Cleaning & Surface Preparation

After casting, unwanted material such as gates, risers, and molding residues is removed.

Depending on the project, surface cleaning and finishing can include shot blasting or other specified treatments.

Step 7 — CNC Machining

Casting provides the basic component geometry, while CNC machining can establish critical functional dimensions.

Available machining operations may include:

• CNC milling

• CNC turning

• Drilling

• Boring

• Tapping

• Reaming

• Surface machining

This is particularly important for components requiring accurate:

• Mounting holes

• Bearing seats

• Bores

• Threads

• Flat surfaces

• Assembly interfaces

Step 8 — Final Inspection

Finished components are inspected according to the agreed engineering requirements.

Inspection may include:

• Dimensional inspection

• Visual inspection

• Material verification

• Chemical composition testing

• Hardness testing

• Machining inspection

• Surface inspection

Inspection documentation can be provided according to project requirements.

Casting + CNC Machining: Why They Are Often Used Together

Many industrial components do not need every surface to be manufactured to the same dimensional tolerance.

Casting can create the overall geometry of the component, while machining can be reserved for the surfaces that actually affect assembly or performance.

For example:

Casting

↓

Cleaning

↓

Shot Blasting

↓

CNC Machining

↓

Dimensional Inspection

↓

Finished Component

This approach can be useful for housings, brackets, bases, hubs, flanges, and other mechanical components.

Instead of machining an entire component from solid material, the casting creates much of the required geometry first.

The actual manufacturing route should still be determined from the component drawing and application.

What Quality Control Should You Expect From a Metal Foundry?

For OEM components, quality should not be treated as a final-step inspection only.

A reliable quality system should address the manufacturing process from material selection through finished-part inspection.

Material Control

Materials should be checked against the specified requirements.

Chemical Composition

For applicable metal castings, chemical composition can be tested according to the required material specification.

Casting Inspection

Castings can be checked for visible surface conditions and other agreed requirements.

Dimensional Inspection

Critical dimensions are compared with approved drawings.

Machining Inspection

Machined:

• Holes

• Bores

• Threads

• Flat surfaces

• Mounting features

can be inspected according to the required tolerances.

Final Inspection

The finished component is reviewed before packaging and shipment.

Where required, inspection documentation and material-related documentation can be provided.

Industrial Applications of Custom Metal Castings

Our custom metal casting solutions can be evaluated for a wide range of industrial applications.

Industrial Machinery

Housings, brackets, supports, bases, covers, and other mechanical components.

Pumps & Fluid Handling

Housings, flanges, supports, and related mechanical components.

Power Transmission

Gear housings, hubs, supports, mounting components, and structural parts.

Agricultural Machinery

Custom cast components used in agricultural equipment and machinery assemblies.

Construction Equipment

Structural and mechanical components exposed to demanding working conditions.

Automotive & Motorcycle Components

Custom cast components for selected structural and mechanical applications.

Material Handling Equipment

Components used in equipment exposed to repeated mechanical movement and loading.

OEM Metal Foundry Services for Manufacturers

If you already have a component design, you do not need to start with a standard catalog product.

We can work from your existing engineering information.

You can send:

2D Drawing

Dimensions, tolerances, material, and technical requirements.

3D CAD File

STEP, STP, IGES, or another compatible format.

Physical Sample

Useful when an existing component needs to be reproduced or evaluated.

Material Specification

Required material grade or applicable international standard.

Production Quantity

Estimated batch quantity or annual demand.

Machining Requirements

Identify critical holes, bores, threads, mounting surfaces, and tolerances.

Application Information

If possible, tell us how the component is used and what operating conditions it experiences.

The more complete the engineering information, the more effectively the manufacturing solution can be evaluated.

What Makes a Good Metal Foundry Partner?

When comparing foundries, price should not be the only consideration.

For OEM buyers, we recommend evaluating six areas.

1. Material Capability

Can the supplier work with the material specified for your application?

2. Process Capability

Can the foundry provide the casting process appropriate for your component?

3. Machining Capability

Can critical surfaces be machined after casting?

4. Quality Control

Can the supplier inspect the dimensions and material requirements that actually matter to your assembly?

5. Engineering Communication

Can the supplier identify potential manufacturing issues before production?

6. Supply Chain Coordination

Can casting, machining, finishing, inspection, packaging, and shipment be coordinated efficiently?

A lower casting price does not necessarily mean a lower total procurement cost if the project later requires additional machining, sorting, rework, or supplier coordination.

What Information Should You Send for a Metal Casting Quote?

To evaluate a custom casting project efficiently, please provide as much of the following information as possible.

Required

• Part drawing or CAD file

• Material requirement

• Estimated quantity

Helpful

• Annual demand

• Critical dimensions

• Machining requirements

• Surface treatment

• Application

• Working environment

• Existing sample

• Applicable technical standards

Example

If you are sourcing a cast housing, don't simply tell us:

"I need 500 housings."

A much more useful inquiry would include:

"Here is the 3D CAD file, material requirement, annual quantity, critical bore tolerance, machining requirement, and surface treatment."

This allows the engineering team to evaluate the project more accurately.

Custom Metal Foundry FAQ

What is a metal foundry?

A metal foundry manufactures metal components by melting metal and forming it into engineered shapes using casting processes. Depending on the project, castings may subsequently undergo cleaning, machining, surface treatment, and inspection.

What types of metal can be cast?

Depending on the project and manufacturing capability, materials may include gray iron, ductile iron, carbon steel, stainless steel, and other specified metal alloys.

Can you manufacture castings from our drawings?

Yes. Custom OEM components can be evaluated according to 2D drawings, 3D CAD files, samples, and technical specifications.

Can you manufacture from a physical sample?

Yes. A physical sample can be provided for technical evaluation. If reverse engineering is required, the scope should be discussed before production.

Can castings be CNC machined?

Yes. Suitable castings can undergo CNC milling, turning, drilling, boring, tapping, reaming, and other machining operations.

How do I know which casting process I need?

The process should be selected according to the component's geometry, material, production quantity, dimensional requirements, and application. You can send us the drawing or CAD file and let the engineering team evaluate the appropriate route.

Can you produce small batches?

Production quantity depends on the component, tooling requirements, material, and manufacturing process. Prototype, small-batch, and larger-volume OEM projects can be evaluated individually.

Can you provide inspection documentation?

Inspection and material-related documentation can be provided according to the agreed project requirements.

What information do you need before quotation?

A 2D drawing or 3D CAD file, material specification, estimated quantity, and machining requirements are preferred. Application and surface-treatment information can also help with evaluation.

Do you provide OEM manufacturing?

Yes. The service is intended for manufacturers, equipment companies, engineering businesses, and industrial distributors that require custom components based on their own designs or samples.

Request a Metal Casting Quote

Have a Component That Needs to Be Cast?

Send us the information you already have.

You do not need to prepare a perfect RFQ before contacting us.

A drawing, CAD file, or sample photo is enough to begin an initial discussion.

Our team can then evaluate:

Material → Casting Process → Tooling → Machining → Inspection → Delivery

Send Us:

• 2D drawing

• 3D CAD file

• Product sample

• Material requirement

• Quantity

• Machining requirements

• Surface treatment requirements

• Application information

Qingdao Zhaoyuqi Machinery Co., Ltd.

Custom Metal Casting | OEM Manufacturing | CNC Machining | Quality Inspection

Send Your Drawing for Evaluation

Not Sure Which Casting Process You Need?

You don't need to select the casting process before contacting us.

Send us your drawing, CAD model, or sample.

We can evaluate the component based on:

Part Geometry

Material

Production Volume

Dimensional Requirements

Machining Requirements

Application Conditions

Then we can discuss a suitable manufacturing route for your project.