Gear Pump Housing Investment Casting

Product Overview

Gear Pump Housing is a precision investment casting component manufactured by Wuxi Huayong Metal Technology Co., Ltd. Our investment casting process ensures exceptional dimensional accuracy, superior surface finish, and excellent mechanical properties. Unlike sand casting, investment casting produces near-net-shape components with minimal machining requirements, reducing overall cost and lead time.

All our gear pump housing castings are custom manufactured based on customer drawings or samples. We work closely with our clients' engineering teams to optimize designs for castability, ensuring high-quality, defect-free castings at competitive prices. Every component undergoes rigorous quality control including chemical analysis, mechanical testing, and non-destructive testing.

Material Options

We offer a wide range of materials for gear pump housing castings, including stainless steel, carbon steel, alloy steel, copper alloys, and heat-resistant alloys. All materials are sourced from certified suppliers and verified with spectrometer analysis.

Material Family	Common Grades	Key Properties	Typical Applications
Stainless Steel	CF8M, CF8, CF3M, CF3, 316L, 304L	Excellent corrosion resistance, good mechanical properties	Chemical, food, marine, water treatment
Carbon Steel	WCB, WCC, LCC, LC2	Good strength, weldability, cost-effective	Oil & gas, power, general industrial
Alloy Steel	WC6, WC9, C5, C12A, 42CrMo	High temperature strength, wear resistance	Power generation, high-temp service, automotive
Duplex Steel	CD4MCu, CD3MN, 2205	High strength, excellent pitting resistance	Oil & gas, desalination, chemical
Copper Alloy	C95400, C93200, C83600, Tin Bronze	Excellent wear resistance, corrosion resistance	Bearings, gears, marine, decorative
Heat Resistant	HK30, HU31, 310S, 309S	High temperature oxidation resistance	Furnace parts, heat treatment, power

Manufacturing Process

1. Pattern Making

We produce high-precision wax patterns using injection molding. The wax patterns are exact replicas of the final gear pump housing, including all internal passages and external features.

2. Shell Building

The pattern tree is repeatedly dipped into ceramic slurry and coated with refractory sand. This process is repeated 6-8 times to build a strong, heat-resistant ceramic shell.

3. Dewaxing & Preheating

The ceramic shell is placed in an autoclave where steam melts the wax, which drains out. The empty shell is then preheated to 1000-1100°C to remove residual moisture.

4. Melting & Pouring

Metal is melted in induction furnaces under carefully controlled conditions. The molten metal is poured into the preheated ceramic shells.

5. Shell Removal & Cutting

After solidification and cooling, the ceramic shell is removed by mechanical vibration and blasting. The individual components are then cut from the sprue.

6. Heat Treatment

All castings undergo proper heat treatment to achieve optimal mechanical properties and material structure.

7. CNC Machining

The cast gear pump housing are precision machined on CNC lathes and machining centers. We maintain tight tolerances on critical dimensions.

8. Surface Treatment & Testing

Finished components undergo surface treatment and comprehensive quality testing including dimensional inspection, chemical analysis, and non-destructive testing.

Quality Control & Testing

We maintain rigorous quality control at every stage of production to ensure that every Gear Pump Housing meets or exceeds customer specifications:

• Chemical Analysis: Spectrometer analysis of every heat, with full material test certificates (EN 10204 3.1)
• Mechanical Testing: Tensile strength, yield strength, elongation, and hardness testing per ASTM A370
• Dimensional Inspection: CMM (Coordinate Measuring Machine) inspection of critical dimensions
• Non-Destructive Testing (NDT): Radiographic testing (X-ray), liquid penetrant testing, ultrasonic testing as required
• Microstructure Examination: Metallographic analysis to verify grain structure and detect defects
• Pressure Testing: Hydrostatic pressure testing for pressure-containing components

Applications

Our gear pump housing castings are used in a wide range of industries and applications:

• Oil & Gas: Upstream, midstream, and downstream processing, refineries, pipelines
• Chemical Processing: Acid handling, chemical reactors, transfer lines
• Power Generation: Thermal power, nuclear power, renewable energy
• Water Treatment: Desalination, wastewater treatment, water distribution
• Food & Beverage: Processing, filling, CIP systems, sanitary applications
• Pharmaceutical: Drug manufacturing, sterile processing, biotech
• Marine: Shipbuilding, offshore platforms, desalination
• Automotive: Engine components, transmission parts, exhaust systems
• Aerospace: Aircraft components, turbine parts, structural components
• Pulp & Paper: Bleaching, chemical recovery, stock preparation

Why Choose Huayong for Your Gear Pump Housing Castings?

• Complete In-House Capability: From wax pattern to final CNC machining — all under one roof for better quality control
• Material Expertise: Experienced in stainless steel, carbon steel, alloy steel, copper alloys, and specialty alloys
• ISO 9001 Certified: Rigorous quality management system with full traceability
• Custom Manufacturing: All parts made to your exact drawings and specifications
• Competitive Pricing: Factory-direct pricing with no middleman markup
• Fast Response: Quotations within 48 hours, technical support 24/7
• Global Export Experience: Serving clients in Europe, North America, Middle East, and Southeast Asia
• Flexible MOQ: From prototype quantities to mass production

Engineering Design Tips for Pump Component Castings

1. Impeller Blade Design

For investment cast impellers, maintain blade thickness between 3-8mm for optimal castability. Avoid undercuts that prevent wax pattern withdrawal. Use smooth blade transitions with minimum 2mm fillet radii.

2. Pump Casing Volute Design

Design volute profiles with consistent cross-sectional area progression. Ensure adequate wall thickness (minimum 4mm) to withstand operating pressures and allow for machining.

3. Shaft Hub and Keyway Design

For impeller hubs, design with sufficient bore diameter for shaft fit. Keyways are typically machined post-casting. Allow 2-3mm machining allowance on all mating surfaces.

4. Surface Finish for Flow Efficiency

Investment casting provides Ra 1.6-3.2μm as-cast surface finish, which improves hydraulic efficiency. For critical pump applications, electropolishing or machining of flow paths can further enhance performance.

Frequently Asked Questions

Q: What types of pump components can you cast?

A: We cast impellers (closed, semi-open, open), pump casings/volutes, diffusers, pump bowls, shaft sleeves, wear rings, brackets, and custom pump components.

Q: Can you produce dynamically balanced impellers?

A: Yes, we can perform dynamic balancing on impellers up to specified ISO 1940 grades. Balancing is typically done after machining as a post-casting operation.

Q: What materials are best for corrosive pump applications?

A: For corrosive environments, we recommend CD4MCu (Duplex 2205), Alloy 20, Hastelloy C276, or CF8M (316L). Material selection depends on the specific chemical environment and operating temperature.

Q: Can you cast large pump casings?

A: Our investment casting capacity covers pump components up to approximately 100kg per piece. For larger casings, we may recommend alternative casting methods in partnership with our associated foundries.