Gearbox Housing Green Sand Molding Casting For Mining Machinery Transmission Systems
This Gearbox Housing Casting is a core structural and fluid-containing component designed for mining machinery transmission systems, heavy-duty conveyor drives, crusher gearboxes, and industrial speed reducer assemblies. Weighing approximately 25 kg, it is manufactured by our in-house Sand Casting (Green Sand Molding) + CNC precision machining process to achieve high strength, precise bearing bore geometry, and reliable oil-tight sealing. The use of ductile iron QT500-7 provides an excellent balance of high tensile strength (≥500 MPa), superior elongation (≥7%) and impact toughness, and excellent fatigue resistance under cyclic loading.
Matech's one-stop approach, covering pattern making, green sand casting, annealing heat treatment, CNC machining (bearing bores, gasket faces, dowel holes, threaded holes, oil gallery interfaces), leak/pressure testing, surface treatment (grey anti-corrosion spray coating), and engineered packing, ensures this gearbox housing offers excellent pressure tightness, tight dimensional tolerances on bearing bores and dowel locations, and a ready-to-assemble finish — performing reliably in demanding heavy-duty mining transmission and powertrain environments.
design customization
Please fill out the form below to request a quote or to request more information about us. Please be sure to upload customized requirement documents or pictures, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
Please fill out the form below to request a quote or to request more information about us. please be as detailed as possible in your message, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
Custom Heavy-Duty Gearbox Casing | Green Sand Casting | 25kg QT500-7 Transmission Housing for Mining Equipment — Matech
| Specification | Details for This Case | Matech’s Capability / Notes |
| Alloy Grade | QT500-7 | We work with Gray Cast Iron(HT150, HT200, HT250, HT300),Ductile Cast Iron(QT400-18,QT500-7,QT600-3,QT700-2),Vermicular Graphite Cast Iron(RuT300,RuT400),Alloy Cast Iron(Heat-resistant,Corrosion-resistant grades),with material certification provided |
| Unit Weight | 25 kg | We can handle iron casting parts from 0.1 kg ~ 50 kg |
| Overall Dimensions | 500 × 150 × 450 mm | Maximum machining size approximately 1200 × 1000 × 600 mm, subject to drawing confirmation |
| Casting Tolerance | CT8-CT10 (GB/T 6414) | Achieved via our in-house precise tooling and stable assembly line production process |
| Machining Tolerance | ±0.02mm | Achieved by 3/4/5-axis CNC centers. Tighter tolerances can be discussed,with best achievable tolerance up to 0.005 mm |
| Surface Roughness | Ra 25 μm (unmachined surface) / Ra 1.6 µm (machined surface) | Typical machined surface roughness can reach Ra 0.8–3.2 μm (turning/milling); Ra 0.4–0.8 μm achievable after grinding |
| Min. Wall Thickness | 8mm | We specialize in thin-wall castings; min. 3.0 mm (for iron castings)feasible depending on geometry. |
| Heat Treatment | Artificial Aging Treatment (Stress-Relief Annealing) | Annealing, normalizing available for iron castings |
| Surface Treatment | grey anti-corrosion spray coating | Options: Sandblasting / Shot Blasting, Painting (Spraying / Dipping),Dacromet Coating,Black Electrophoresis (ED-Coating),Anti-rust Oil etc. Corrosion resistance per your spec. |
| Application | Mining Equipment | We serve Mining, automotive, industry equipment, machinery, pump & valve, new energy, etc. |
| MOQ | 200 pcs | Flexible MOQ, starting from prototype/small batch quantities. |
| Sample Lead Time | 25-40 working days (with new tooling) | Defined upon drawing review. Expedite options available. |
| Production Lead Time | 30-45 working days | Based on order quantity and complexity, confirmed in contract. |
| Drawing Formats | STEP, IGES, X_T, DWG, PDF | We process all standard 2D/3D formats. |
| Customizable | Manufactured according to drawings or samples | Every aspect—material, geometry, tolerance, finish—is built to your design. |
| Certification | ROHS,ISO 9001:2015 | Material certificates, dimensional inspection reports, and PPAP Level 3 documentation available upon request for automotive and critical components |
| Packing | Custom PE foam + plywood crate | Engineered packing designed for your part’s specific fragile/critical areas. |
Customization Options
Every casting project starts with your unique design and requirements. Whether it's iron, steel, or aluminum, we tailor every aspect of the manufacturing process to your exact specifications. Below are the key dimensions you can customize with Matech — your drawing is our only standard.
Material Selection
From aluminum alloy to grey/ductile iron to carbon steel/stainless steel — we pour the alloy your design demands. Custom compositions are welcome. Full material certification included.
Casting Process
Our engineers tailor the most suitable manufacturing process to your specific needs based on your part's geometry, volume, and performance requirements, ensuring the optimal balance between quality and cost.
Dimensional Accuracy & Machining
We machine to your exact tolerances. In-house 3/4/5-axis CNC with custom fixtures. Casting tolerance CT4-CT11, machining tolerance up to ±0.005mm.
Heat Treatment
MATECH provides a full range of heat treatment services, including:Annealing, Normalizing, Quenching, Tempering, Carburizing, Nitriding, Solution Treatment.
Surface Treatment & Coating
Matech support: Sandblasting / Shot Blasting,Chemical Degreasing, Pickling/Passivation, Mechanical Grinding / Polishing, Zinc Plating, Hard Chrome Plating, Electroless Nickel Plating, Anodizing, Dacromet, Powder Coating, Black Oxide, Stainless Steel Passivation.
Testing, Documentation & Packaging
From material certificates to complete customs clearance documents, and from custom pallets to packaging optimized for your product's specific characteristics. Your parts arrive fully documented, well-protected, and ready for immediate use.
Our Advantages
Technical Advantages
Pattern shop, green sand molding & resin sand casting lines, CNC machining, heat treatment, and inspection lab — all centralized under one roof. No outsourcing. From base iron melting to finished and coated part, we maintain full control over lead time, quality consistency, and batch traceability.
Before pattern production begins, we provide a detailed DFM report covering solidification behavior, graphite morphology control, gating & riser design, core assembly strategy, and machining allowance optimization. For gearbox housings like this 25 kg component, we focus on riser placement at thick flange and bearing boss intersections, core stability for internal oil galleries, and controlled solidification to ensure sound bearing bores after machining.
We specialize in geometrically demanding parts with complex internal cavities and multi-core assemblies — such as gearbox housings, transmission cases, engine blocks, pump housings, and cylinder heads. Our green sand molding line delivers cost-effective production with excellent dimensional repeatability for medium to heavy castings, while shell molding provides superior surface finish on critical sealing faces. We pour a full range of grades — grey iron (HT150–HT350), ductile iron (QT400-18 to QT700-2) — with in-house heat treatment to tailor hardness, strength, and impact toughness to your specification.
Service Advantages-总部接待区 1 拷贝
Material Advantages
We charge carefully proportioned pig iron, steel scrap, and ferroalloys (FeSi, FeMn, nodulizer) into our electric induction furnaces. Carbon equivalent, silicon content, and alloying elements are spectrometer-verified and adjusted in real time before tapping. Precise inoculation and nodulization practices ensure consistent graphite morphology and mechanical properties across every pour — critical for maintaining uniform QT500-7 strength and impact toughness throughout a 25 kg structural housing.
Every production batch is identified by a unique heat number. Chemical composition reports, mechanical test records (tensile strength, yield strength, elongation, hardness, and impact toughness), metallographic analysis (graphite nodularity, matrix structure), and heat treatment charts are compiled into a traceable dossier — from furnace charge to finished casting.
We pour a comprehensive range of grey iron (HT150–HT350), ductile iron (QT400-18 to QT700-2), austempered ductile iron (ADI), Ni-resist, and high-Si-Mo ductile iron. Whether your application demands fatigue resistance under cyclic loading, impact toughness for mining shock conditions, or oil-tight structural integrity, we match the grade and heat treatment to your requirements.
Service Advantages
A dedicated project manager oversees the entire process — from design review to final delivery — ensuring efficient communication at every stage and a single point of contact for all technical and commercial matters.
Quotations are typically provided within 24–48 hours. Production progress is updated regularly through photos and production data, with continuous customer feedback collection throughout the project. For gearbox housings, first-article inspection reports including dimensional layout and leak test results are provided before batch production begins.
Full batch traceability and 24-hour response to quality-related issues ensure reliable post-delivery support. Flexible MOQ with pilot order options available for new gearbox housing projects.
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Contact Us
Contact us now! Our technical team and mechanical engineers are ready to provide one-stop support for your project from requirement review, quotation to delivery.
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E-mail: ma@matechin.com
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