Zinc & Aluminum Die Cast Parts Wholesale

Zinc & Aluminum Die Cast Parts

-- Steady & Reliable Manufacturer --

Yuyao Hongli Optoelectronics Co., Ltd. is a premier manufacturer of Zinc & Aluminum Die Cast Parts, specializing in high-density, thin-wall, and high-strength metal castings for automotive assemblies, lighting housings, power tools, and electronic enclosures. Operating from our 5,000-square-meter facility in Yuyao, Zhejiang, we run automated cold-chamber aluminum and hot-chamber zinc die casting machines ranging from 88T to 800T. We cast premium alloys including ADC12, A380, A360, Zamak 3, and Zamak 5 into intricate components featuring smooth surface finishes, high dimensional accuracy, and zero internal porosity. Partner with Yuyao Hongli for integrated mold design, precision CNC post-machining, powder coating, and direct-factory OEM supply.

MANUFACTURING CAPABILITIES

Equipment and process capabilities

From mold design to batch stamping, we cover production needs of different tonnages and precision levels.

  • 01

    High-Pressure Cold Chamber Aluminum Die Casting

    Utilizing high-tonnage cold chamber die casting machines up to 800T, we inject molten aluminum alloy at high speed to produce complex, thin-walled structural housings with high strength-to-weight ratios.

  • 02

    Hot Chamber Zinc Alloy Precision Die Casting

    Our hot chamber zinc casting machines produce high-precision, intricate hardware parts with tight tolerances, excellent impact strength, and exceptional surface fluidity for ultra-thin walls down to 0.8mm.

  • 03

    Secondary CNC Milling & Turning Post-Machining

    Equipped with 4-axis CNC machining centers, we perform precision trimming, thread tapping, face milling, and bore reaming to achieve critical assembly tolerances down to ±0.01mm.

  • 04

    Automated Shot Blasting & Electrostatic Powder Coating

    We operate automated shot blasting machinery to remove flash and smooth cast surfaces, followed by weather-resistant powder coating or anodizing for superior corrosion protection.

SPEC · Overview of Key Equipment Parameters

Equipment TypeTonnage / SpecificationMachinable MaterialTypical Processing Thickness
Cold Chamber Die Casting Machine160T - 800T High-Pressure CastingAluminum Alloys (ADC12, A380, A360, AlSi10Mg)1.2mm - 8.0mm Wall Thickness
Hot Chamber Die Casting Machine88T - 250T Automatic CastingZinc Alloys (Zamak 3, Zamak 5, ZA-8)0.8mm - 5.0mm Wall Thickness
4-Axis CNC Machining Center12,000 RPM High-Speed SpindleCast Aluminum & Zinc ComponentsPost-Machining Precision ±0.01mm
X-Ray Porosity Inspection Unit160kV Real-Time Industrial X-RayStructural Die Cast PartsInternal Defect Detection
QUALITY CONTROL

Full-process quality control system

From incoming material inspection to full outgoing inspection, key processes are equipped with inspection points to ensure batch consistency.

X-Ray Non-Destructive Porosity Inspection

Detecting internal gas pores and shrinkage defects inside critical load-bearing castings.

  • 160kV real-time X-ray inspection ensuring structural density compliance.
  • Density checks and sectioning analysis for pressure-tight liquid/gas housings.
  • Helium leak testing for sealed automotive and pump enclosures.

3D CMM & Optical Dimension Audit

Verifying strict geometric tolerances across complex casting contours.

  • Coordinate Measuring Machine (CMM) inspection for hole locations and flatness.
  • 3D laser scanning against customer 3D CAD models to check shrinkage compensation.
  • Thread pitch diameter checking after secondary tapping operations.

Salt Spray & Surface Finish Quality Testing

Ensuring exterior painted and electroplated die castings withstand outdoor exposure.

  • Neutral Salt Spray (NSS) testing per ASTM B117 (up to 720 hours for powder coated aluminum).
  • Cross-hatch adhesion testing (ISO 2409) for painted and e-coated castings.
  • Surface roughness measurement (Ra 1.6 to 3.2 µm standard cast finish).
SURFACE FINISHING

Surface treatment process

Depending on the usage environment and appearance requirements of the parts, we offer anti-corrosion, wear-resistant, or decorative surface treatment solutions.

Finishing ProcessApplicable MaterialPrimary FunctionTypical Application
Electrostatic Powder CoatingAluminum Alloys, Zinc AlloysProvides durable, UV-resistant, colorful protective shell against corrosionOutdoor LED light housings, automotive motor covers, power tool bodies
Chromate Conversion Coating (Chemical Film)Cast Aluminum (ADC12, A380)Improves paint adhesion and provides corrosion resistance without changing dimensionsElectronic heat sinks, internal automotive module frames, telecom enclosures
Copper-Nickel-Chrome ElectroplatingZinc Alloys (Zamak 3, Zamak 5)Delivers brilliant mirror-like chrome finish with high scratch resistanceAutomotive door handles, bathroom hardware fixtures, decorative emblems
Anodizing / Hard AnodizingCast Aluminum AlloysCreates hard anti-wear oxide layer with excellent dielectric insulation propertiesHigh-performance engine brackets, hydraulic valve bodies, heatsinks
Note: The above is a standard process list. Specific film thickness, color, and salt spray resistance rating can be customized according to customer drawings.
APPLICATIONS

Main application areas

Our products are widely used in industries that require high structural strength and precision consistency.

Automotive Powertrain & Structural Housings

Lightweight, high-strength aluminum and zinc die castings engineered for vehicle platforms.

  • Automotive electronic control unit (ECU) heat-sink enclosures
  • Transmission shift lever brackets and wiper motor housings
  • Electric vehicle (EV) battery module cooling end plates

Industrial Lighting & Power Tool Housings

Rugged die-cast metal enclosures built for heavy outdoor and industrial environments.

  • Outdoor LED street light heat-sink fixture housings
  • High-bay industrial light driver enclosures
  • Pneumatic tool handles and gear case housings

Electronics & Precision Hardware Components

Tight-tolerance zinc die-cast lock components and telecom electronics shielding.

  • Smart door lock bodies, escutcheons, and latch hardware
  • 5G telecom RF filter housings and shielding covers
  • Precision optical instrument mounting frames
PRODUCTION / FACTORY ADVANTAGES

Factory production advantages

With its own factory and equipment, the company ensures stable delivery times and controllable costs.

20+ Years of Die Casting & Mold Engineering

Yuyao Hongli brings over two decades of casting experience, mold flow simulation, and alloy processing in Yuyao, Zhejiang.

Complete In-House Tooling & CNC Machining

We handle mold design, die casting, precision CNC post-machining, and surface finishing within our integrated plant.

X-Ray & CMM Backed Quality Assurance

Equipped with industrial X-ray inspection and 3D CMM machines to guarantee defect-free, pressure-tight castings.

CUSTOM MANUFACTURING PROCESS

Customized production process

From receiving drawings to batch delivery, standardized processes ensure traceability at every stage.

  • 1. Part Design & Mold Flow Simulation

    We review customer 2D/3D CAD files and run computer mold flow analysis to optimize gating, runner, and overflow design.

  • 2. Die Casting Mold Tooling Fabrication

    Our toolmakers machine high-durability H13 tool steel molds with conformal cooling channels to ensure long mold life.

  • 3. Trial Casting, X-Ray & FAI Inspection

    First sample castings undergo X-ray porosity testing, CMM dimensional checks, and surface finish checks for customer approval.

  • 4. Mass High-Pressure Casting & CNC Machining

    Automated casting cells produce parts at high cycle rates, followed by robot trimming and CNC precision machining.

  • 5. Powder Coating, Quality Audit & Shipping

    Parts undergo shot blasting, powder coating or plating, pass 100% final inspection, and are packed in custom protective boxes.

FAQ

Frequently Asked Questions

Here are some questions that clients often ask before cooperating with us.

What is the main difference between zinc and aluminum die casting?

Zinc alloys have a lower melting point, allowing thinner walls (0.8mm) and longer mold life, while aluminum alloys offer lighter weight and higher temperature tolerance.

How do you control internal porosity in aluminum die cast parts?

We use mold flow simulation, vacuum-assisted die casting, controlled shot speeds, and verify internal density using real-time industrial X-ray equipment.

What precision can be achieved after secondary CNC machining on castings?

Our 4-axis CNC machining centers achieve post-machining tolerances down to ±0.01mm on critical bores, bearing seats, and sealing faces.

What aluminum and zinc alloys do you commonly use?

Common aluminum alloys include ADC12, A380, A360, and AlSi10Mg. Common zinc alloys include Zamak 3, Zamak 5, and ZA-8.

About Us
Yuyao Hongli Optoelectronics Co., Ltd.
Yuyao Hongli Optoelectronics Co., Ltd.
Yuyao Hongli Optoelectronics Co., Ltd. is a comprehensive enterprise with over 20 years of experience in the manufacturing industry. Located in the Yangming Science and Technology Industrial Park of Yuyao, Zhejiang Province, it enjoys convenient transportation and a solid industrial foundation. As a famous China Zinc & Aluminum Die Cast Parts Suppliers and Zinc & Aluminum Die Cast Parts Factory, founded in 2000, formerly known as Yuyao Hongli Optoelectronics Educational Instruments Co., Ltd., the company is wholly owned by a natural person, with Xie Gang as the legal representative. Its registered capital of 500,000 yuan has been fully paid up, and it has maintained its continued development through stable operations.
Relying on a 5,000-square-meter modern factory and multiple stamping workshops, the company has built a diversified product system. Its core businesses cover the manufacturing, processing and wholesale and retail of educational instruments, optical instruments, household electric heaters, small household appliances, auto parts, hardware and plastic products, etc. At the same time, it operates and acts as an agent for the import and export trade of goods and technologies, and its products are sold at home and abroad.
The company brings together industry management elites and senior engineers to form a mature R&D and management team. Adhering to the business philosophy of "integrity and pragmatism," it is committed to providing customers with high-quality products and comprehensive after-sales service. Leveraging its diversified portfolio, certification guarantees, and import/export advantages, the company actively expands cooperation both domestically and internationally, and is willing to establish long-term and stable trade partnerships with partners from all sectors, continuously striving forward in the wave of intelligent and high-end development in the manufacturing industry.
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