Custom Sand Casting for Industrial Components
LANJIAN manufactures custom sand castings for machine bases, equipment housings, structural supports and other industrial machinery components based on customer drawings.
Before production, we review the material, casting geometry, pattern and core requirements, machining allowances and inspection criteria. The approved route is then followed through molding, pouring, cooling, shakeout, cleaning and as-cast inspection.
- Drawing-Based Custom Production
- Pattern, Mold and Core Planning
- Sand Casting Process Control
- Casting-Specific Quality Inspection
Scope: Custom sand-cast industrial components—not standard stock parts or complete machines.
Manufacturing Capabilities Matched to Your Component
LANJIAN supports drawing-based production of custom cast, machined, and fabricated industrial components. Available capabilities include sand casting, lost foam casting, CNC machining, welding and fabrication, surface treatment and finishing, and assembly. These processes can be used separately or coordinated according to the confirmed component and project requirements.
Drawing-Based Manufacturing
Projects can begin with customer drawings, 3D models, samples, or confirmed technical requirements.
Primary Manufacturing Routes
The primary route—sand casting, lost foam casting, or welding and fabrication—is selected according to the material, geometry, and structural requirements.
Secondary Process Integration
CNC machining, surface finishing, and assembly can be added when required by the drawing and intended delivery condition.
Standalone or Combined Processes
A project can use one capability or connect several processes within an agreed manufacturing route.
What Each Manufacturing Capability Does
Some processes create the basic component shape, while others add functional features, surface protection, or final assembly. Explore what each capability does and where it may fit within your manufacturing route.
Sand Casting
Molten metal is poured into a sand mold formed around a pattern. Separate sand cores can also be used to create holes or internal cavities.
TYPICAL USE
Large or heavy cast components such as machine bases, housings, equipment supports, and structural parts.
Lost Foam Casting
A coated foam pattern shaped like the component is embedded in sand. During pouring, molten metal replaces the foam and forms the casting.
TYPICAL USE
Complex cast shapes where conventional parting lines or separate core arrangements would be difficult.
CNC Machining
Computer-controlled cutting tools remove material from a workpiece to create accurate surfaces and functional features.
TYPICAL USE
Mounting faces, bores, bearing seats, holes, threads, and other features that must meet drawing dimensions.
Welding & Fabrication
Metal plates and structural sections are cut, formed, positioned, and welded together to create a complete structure.
TYPICAL USE
Machine frames, equipment chassis, conveyor supports, skid bases, and other welded structural assemblies.
Surface Treatment & Finishing
Cleaning, preparation, and finishing processes are applied after casting, welding, or machining to achieve the agreed surface condition.
TYPICAL USE
Components requiring corrosion protection, a specified finish, or a defined surface appearance before delivery.
Assembly
Separately manufactured parts are fitted together according to the confirmed drawing, interfaces, and assembly requirements.
TYPICAL USE
Subassemblies or assembled components that need to be supplied as a coordinated unit rather than as separate parts.
Which Manufacturing Route Fits Your Component?
The route is selected from how the component can be formed and which features must be completed—not from the product name alone. The table below shows the drawing characteristics that usually trigger each manufacturing capability.
What We See in the Drawing | Route to Evaluate | What Must Be Checked |
A large or heavy one-piece casting with a workable parting line and internal cavities that can be supported by sand cores | Sand Casting | Pattern removal, core positioning, wall transitions, locating surfaces, and machining allowance |
A complex one-piece casting where conventional parting lines or multiple separate cores would make molding difficult | Lost Foam Casting | Foam-pattern feasibility, section changes, tooling, expected quantity, and later machining areas |
A frame, chassis, base, or support that can be built from plates and structural sections | Welding & Fabrication | Joint access, fit-up, welding distortion, critical interfaces, and machining required after welding |
Bearing seats, bores, mounting faces, holes, or threads that must maintain controlled dimensions and positions | Add CNC Machining | Machining datums, available allowance, tool access, related feature positions, and inspection points |
Surfaces requiring corrosion protection, a specified finish, or a defined appearance | Add Surface Treatment & Finishing | Surface preparation, finish specification, areas requiring masking, and effects on mating surfaces |
Several parts that must fit and be delivered as a subassembly or coordinated unit | Add Assembly | Mating interfaces, accumulated tolerances, supplied parts, assembly sequence, and final verification |
Any issue that could affect the approved drawing, critical features, or final acceptance should be reviewed before the affected parts move into the next manufacturing stage.
Combined Manufacturing Routes for Finished Components
A custom component may require more than one manufacturing process before it is ready for installation or assembly. The primary process creates the basic shape, while subsequent operations establish critical functional features, provide surface protection, or combine multiple parts.
The required stages are selected from the drawing—processes are included only when they contribute to the component’s function or required delivery condition.
Cast and Machined Housings
Manufacturing Route
Sand Casting or Lost Foam Casting
→ Casting Cleaning
→ CNC Machining
→ Surface Finishing
→ Final Verification
Casting forms the main component geometry, including walls, ribs and internal cavities. CNC machining then produces the features that must meet controlled dimensions, such as bearing seats, bores, mounting faces, flange faces and bolt-hole positions. Surface finishing is completed after machining, with sealing faces, threads and fitted areas protected when required.
Machining allowance, locating references and surfaces requiring machining must be identified before the casting is produced—not after the casting blank is completed.
- Gearbox housings
- reducer housings
- bearing housings and other cast components with machined interfaces
Welded and Machined Frames
Manufacturing Route
Cutting and Forming
→ Fit-Up and Welding
→ Dimensional Verification
→ CNC Machining of Critical Interfaces
→ Surface Finishing
Cut plates and structural sections are positioned and welded to create the main load-carrying structure. The completed fabrication is then checked for flatness, alignment and key dimensions. Where the drawing requires tighter control, mounting faces, guide surfaces and connection holes are machined after welding.
Welding heat can affect flatness and alignment. For this reason, critical interfaces are evaluated after fabrication and machined afterward when the required accuracy cannot be maintained by welding alone.
- Machine frames
- equipment chassis
- conveyor supports
- skid bases and other welded structures with machined mounting areas
Finished or Assembly-Ready Components
Manufacturing Route
Casting or Fabrication
→ CNC Machining Where Required
→ Surface Finishing
→ Component Fitting or Assembly
→ Final Verification
Individual cast, fabricated or machined parts are prepared according to their common interfaces. Surface treatment is completed with specified mating areas, threads and fitting surfaces protected. Parts can then be supplied separately, prepared for customer assembly, or fitted together as an agreed subassembly.
Mating dimensions, hole alignment, coating exclusions, part orientation and assembly interfaces must remain consistent across machining, finishing and assembly.
- Mounted housings
- structural support assemblies
- multi-part frames and other coordinated component sets
Not every component requires every capability. Some projects are supplied as casting or fabrication blanks, while others continue through machining, finishing and assembly according to the drawing and required delivery condition.
Combined Manufacturing Routes for Finished Components
Components can be supplied at the stage required for your production workflow, depending on the drawing and agreed manufacturing scope.
- Casting or Fabrication Blank
- Rough-Machined Component
- Finish-Machined Component
- Surface-Finished Component
- Assembly-Ready or Assembled Component
The required machining, finishing, inspection and assembly scope is confirmed before quotation.
Multiple Capabilities, One Connected Manufacturing Route
When a component moves from casting or fabrication to machining, finishing and assembly, each handover can affect the final result. LANJIAN coordinates the required stages around the same confirmed drawing, critical features and delivery condition.
01 — Downstream Work Planned Early
Machining allowance, locating references and critical interfaces are considered before casting or fabrication begins—not after the blank is completed.
02 — Requirements Stay Connected
Critical dimensions, datums, bores, mounting faces, coating exclusions and mating areas remain connected as the component moves between processes.
03 — Problems Reviewed Across the Route
If a dimensional or fitting issue appears, the blank condition, locating method, machining setup and finishing stage can be reviewed together.
04 — Fewer Supplier Handoffs
Buyers can include casting, fabrication, machining, finishing or assembly in one agreed scope instead of managing each operation separately.
Need the Right Process Combination for Your Component?
Send your drawing, 3D model, sample information, or available technical requirements. LANJIAN will review the primary process, required secondary operations, critical features and intended delivery condition before quotation.
- Primary and Secondary Processes Reviewed Together
- Critical Features Considered Between Process Handoffs
- Supply Stage Matched to Your Production Workflow
- Manufacturing Scope Confirmed Before Quotation
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Your drawings and technical information are kept confidential and used only for project review and quotation.
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