Precision Metal Stamping Auto Parts Wholesale

Precision Metal Stamping Auto Parts

-- Steady & Reliable Manufacturer --

Yuyao Hongli Optoelectronics Co., Ltd. is a high-precision source manufacturer of Precision Metal Stamping Auto Parts, supplying durable stamped metal components, bracket assemblies, structural connectors, and electrical contact hardware to automotive OEMs and Tier-1/Tier-2 automotive suppliers. Leveraging over 20 years of metal stamping and tool-and-die manufacturing heritage in Yuyao, Zhejiang, our 5,000-square-meter plant is equipped with multi-stage progressive stamping presses, high-speed punches, CNC press brakes, and automated deburring equipment. We process stainless steel, cold-rolled steel, brass, copper, and high-strength aluminum alloys into high-tolerance automotive components. Adhering to strict automotive quality management principles, Yuyao Hongli delivers high repeatability, zero-defect quality control, and custom tool engineering tailored to demanding automotive specifications.

MANUFACTURING CAPABILITIES

Equipment and process capabilities

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

  • 01

    Progressive & Deep Draw Stamping Tooling

    In-house design and fabrication of multi-station progressive dies and deep drawing tooling, achieving complex 3D shapes, tight bends, and high-volume consistency with tolerances down to ±0.01mm.

  • 02

    High-Speed Precision Stamping & Blanking

    Utilizing high-speed automatic punching presses ranging from 35T to 200T, we produce stamped brackets, shield plates, and copper terminal contacts at high production rates with clean edge quality.

  • 03

    CNC Bending, Tapping & Secondary Machining

    Integrated secondary processing capabilities including multi-axis CNC bending, automated thread tapping, spot welding, and robotic deburring for ready-to-assemble automotive sub-components.

  • 04

    Automated Optical & CMM Quality Inspection

    Every stamped automotive batch is verified using high-precision Coordinate Measuring Machines (CMM) and optical vision measuring systems to maintain zero-defect standards across critical dimensions.

SPEC · Overview of Key Equipment Parameters

Equipment TypeTonnage / SpecificationMachinable MaterialTypical Processing Thickness
High-Speed Precision Stamping Press35T - 200T High-Precision PunchingCold Rolled Steel, Stainless Steel, Brass0.3mm - 4.0mm Metal Sheets
Progressive Die Tooling CNC CenterHigh-Precision Machining CenterCr12MoV, D2, Tungsten Carbide Tool SteelCustom Die Fabrication
CNC Hydraulic Press Brake / Bending Unit100T Multi-Axis CNC Bending MachineSteel, High-Strength Aluminum Alloys0.5mm - 5.0mm Metal Sheets
3D Coordinate Measuring Machine (CMM)Sub-Micron Measurement PrecisionStamped Metallic Auto PartsAccuracy to ±0.002mm
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.

3D CMM & Optical Dimensional Verification

Ensuring every stamped part conforms to tight automotive tolerance blueprints.

  • CMM full-dimensional inspection against 3D CAD models (STEP/IGES).
  • Optical vision projector checking for hole pitch, contour accuracy, and radii.
  • Go/No-Go plug gauge and custom fixture verification on 100% of critical dimensions.

Material Hardness & Tensile Strength Testing

Verifying raw metal properties and post-heat-treatment mechanical strength.

  • Rockwell & Vickers hardness testing on stamped structural components.
  • Raw material spectral composition analysis (PMI testing) for alloy verification.
  • Tensile strength and yield point testing on deep-drawn metal shells.

Corrosion Resistance & Salt Spray Testing

Validating protective surface plating against harsh under-hood and exterior automotive environments.

  • Neutral Salt Spray (NSS) testing per ASTM B117 / ISO 9227 (up to 480 hours).
  • Plating layer thickness measurement via X-ray fluorescence (XRF) gauge.
  • Burr height and edge radius evaluation using optical microscopy.
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
Zinc Plating / Galvanization (Cr3+)Carbon Steel & Alloy SteelProvides excellent corrosion protection with eco-friendly trivalent chrome passivateAutomotive chassis brackets, structural fasteners, hinges
E-Coating (Electrodeposition)Steel & Aluminum Auto PartsUniform primer coating offering high corrosion resistance and chip durabilityUnder-hood brackets, suspension mounting plates
Nickel / Tin PlatingCopper & Brass ContactsEnhances electrical conductivity and prevents oxidation on electrical connectorsAutomotive relay contacts, terminal busbars, sensor brackets
Vibratory Deburring & PassivationStainless Steel PartsRemoves sharp burrs, improves edge smoothness, and enhances corrosion resistanceExhaust system clamps, sensor housings, washer plates
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 Structural & Body Components

High-strength stamped brackets, mounting plates, and structural reinforcements for automotive bodies.

  • Chassis mounting brackets and reinforcement plates
  • Door latch assemblies and hinge stampings
  • Seat frame connectors and slider brackets

Under-Hood & Electrical System Hardware

Precision stamped conductive terminals, shielding covers, and sensor mounting brackets.

  • Automotive electrical copper busbars and connectors
  • Engine compartment heat shield stampings
  • Sensor mounting brackets and ECU housing covers

EV Battery & New Energy Vehicle (NEV) Parts

Custom precision stamped components designed for electric vehicle battery packs and power distribution.

  • EV battery pack copper/aluminum busbar contacts
  • Battery cell module mounting brackets
  • High-voltage connector shielding plates
PRODUCTION / FACTORY ADVANTAGES

Factory production advantages

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

Over 20 Years of Precision Metal Stamping Expertise

Yuyao Hongli brings decades of mature tooling design, progressive stamping, and precision metal fabrication in Yuyao, Zhejiang.

In-House Progressive Tooling & Mold Workshop

We design, machine, and maintain our own stamping dies in-house, reducing tooling lead times and ensuring long-term die accuracy.

Strict Automotive Quality Management & CMM Verification

Equipped with advanced 3D CMM and optical measuring tools, we enforce rigorous quality control from raw material to finished shipment.

CUSTOM MANUFACTURING PROCESS

Customized production process

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

  • 1. Drawing & Automotive DFM Engineering Review

    Client submits 2D/3D CAD drawings (STEP/IGES/DWG) with tolerance specs, material grade, and plating requirements for engineering review.

  • 2. Tooling Design & Progressive Die Fabrication

    Our die engineers design progressive stamping tools using CAD/CAM, machining die components on high-precision CNC equipment.

  • 3. First Article Inspection (FAI) & CMM Approval

    Sample parts are stamped, deburred, surface treated, and subjected to 100% CMM measurement and salt spray testing for client approval.

  • 4. Mass Stamping, Secondary Machining & Surface Finish

    High-volume progressive stamping proceeds with continuous in-line dimensional monitoring, followed by plating/E-coating.

  • 5. Anti-Rust Protective Packaging & Global Shipping

    Parts are treated with anti-rust oil or packed in VCI anti-corrosion bags, boxed, and palletized for export delivery.

FAQ

Frequently Asked Questions

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

What materials can you stamp for automotive parts?

We process cold-rolled steel, hot-rolled steel, stainless steel (SUS304, 316, 430), aluminum alloys (6061, 5052), brass, phosphor bronze, and copper for automotive stamping applications.

What dimensional tolerances can your progressive stamping dies achieve?

With our precision in-house tooling and high-speed stamping presses, we routinely achieve dimensional tolerances down to ±0.01mm on critical features.

Do you manufacture custom progressive dies in-house?

Yes. Yuyao Hongli operates an in-house tooling shop dedicated to designing, machining, testing, and maintaining progressive stamping dies and deep draw molds.

What is your lead time for automotive stamping tooling and prototype samples?

Tooling design and progressive die fabrication typically takes 20 to 30 days. First Article Inspection (FAI) samples are delivered immediately following tool tryout.

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 Precision Metal Stamping Auto Parts Suppliers and Precision Metal Stamping Auto 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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