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Sheet Metal Fabrication Services | Ten Stages In-House | Dongji

Ten stages, one facility

Sheet Metal
Fabrication Services

Cutting, punching, forming, welding, coating, assembly and test all run inside our 38,000 m² plant in Jiangmen, Guangdong. A part never leaves our control between stages — which is what makes a single-source quotation a quotation rather than a coordination exercise.

38,000 m²Facility
200+Employees
2011Established
50+Export markets
166IP assets
Aerial view of Dongji's 38,000 m2 sheet metal fabrication plant in Jiangmen, Guangdong, China
Operator running a 100 ton CNC press brake at Dongji's Jiangmen factory
Automated powder coating line applying RAL finish to sheet metal parts

Production sequence — every stage performed in-house

01
Design
02
Laser cutting
03
CNC punching
04
CNC bending
05
Welding & polishing
06
Surface treatment
07
Cabinet assembly
08
Electrical assembly
09
Testing
10
Packing

Capabilities

Four services live, two in preparation

Each page below publishes the working limits of that process — envelope, thickness, tolerance — rather than an adjective. If a figure is not on the page, we have not measured it, and we will say so rather than quote around it.

Stage 02
Laser Cutting

3 fiber lasers, 3,000–30,000 W. Mild steel to 30 mm, stainless and aluminium to 20 mm, on sheets to 3,000 × 1,500 mm.

30 mmMax mild steel
3,000×1,500Sheet envelope
0.1 mmAccuracy
Stage 03
Metal Stamping & CNC Punching

8 presses to 150 T and 2 CNC punching machines. We quote stamping, punching and laser side by side and tell you where the crossover sits.

150 TMax press
2CNC punches
0.1 mmAccuracy
Stage 04
Bending & Forming

12 CNC press brakes at 100 T, 0.2–22 mm material to 3,200 mm. Tolerance published in full — banded by flange length, not a single optimistic figure.

±0.2 mmFlange ≤100 mm
±0.5°Angle
3,200 mmMax length
Stage 06
Powder Coating & Finishing

Automated line to RAL specification, 150 μm film. 5-year anti-corrosion warranty verified on our own salt spray equipment.

RALColour system
150 μmFilm thickness
5 yrWarranty
Stage 05
Welding & PolishingIn preparation

5 automatic welding robots, TIG and MIG, running 24/7, with 3 automatic grinding machines downstream.

5Welding robots
TIG / MIGProcess
24/7Operation
Stage 07
Assembly & TestingIn preparation

3 inspection lines and 2 electronic assembly lines, including automatic terminal riveting. Cabinet build, electrical assembly and functional test.

3Inspection lines
2Assembly lines
99.5%First-pass yield

Working range

What we can take on

Materials

Mild steel, stainless steel, galvanised steel, aluminium, copper and acrylic.

Thickness

Cutting 0.2 – 30 mm · Forming 0.2 – 22 mm, depending on material.

Envelope

Cutting 3,000 × 1,500 mm · Bending to 3,200 mm · Coating 2,500 × 1,500 mm.

Customisation

Four levels, verified on Alibaba.com: minor modification, drawing-based, sample-based and full development.

Quality

Three-stage inspection at 100% coverage, 99.5% first-pass yield. ISO 9001:2015, CE, SGS, RoHS, UL, ETL, FCC, KC.

Commercial

Quote in 24 h · Prototype 14–21 days · MOQ 100 pieces · Sample $20–100.

Next step

Send drawings. Quote back tomorrow.

Geometry, material, thickness and finish — with those four we quote within 24 hours, across every stage your part needs.

Request a quote
QuotationWithin 24 hours
Prototype14–21 days
Minimum order100 pieces
Sample$20–100
Response timeUnder 4 hours
Guangdong Dongji Intelligent Device Co., Ltd
Wuhe Farm Industrial Zone, Xinhui, Jiangmen, Guangdong 529000, China
+86 750 3596 339
Capabilities & Industries

Comprehensive Solutions

We provide a full spectrum of manufacturing services to accommodate the exact needs of your final delivered product.

⚙️

Our Services

🏗️

Materials & Specs

Mild Steel Stainless Steel Aluminum Galvanized Steel Copper Acrylic
Processing Thickness Range
0.2 mm — 30.0 mm
🌍

Industries Served

  • Smart Vending Solutions
  • EV Charging Stations
  • Data Center / Server Racks
  • Industrial Automation Control
  • Commercial Kitchen Equipment
  • Medical Equipment Housings
  • Automotive Components (BYD)
Core Manufacturing Processes - ZigZag

End-to-End Capabilities

From a 3D blueprint to a fully functional smart device, discover how our 30,000m² Industry 4.0 facility brings your vision to life.

01
Phase 01

Engineering &
Design

Great products start with manufacturable designs. Our engineering team utilizes advanced CAD/CAM software to optimize your blueprints for cost-efficiency and structural integrity before a single cut is made.

DFMDesign For Mfg
3DSolidWorks / ProE
Engineering Design
02
Phase 02

Laser Cutting &
Punching

Speed meets absolute precision. Equipped with German TRUMPF and Japan AMADA fiber laser cutting machines, we slice through materials with staggering accuracy, preparing flawless blanks for the next stage.

3000WLaser Power
0.1mmAccuracy Limit
Laser Cutting
03
Phase 03

CNC Forming &
Bending

Complex geometries require robust machinery. Our forming department houses 12 precision CNC press brakes, effortlessly shaping metal plates ranging from 0.2mm to 22.0mm thick without compromising dimensional accuracy.

12CNC Machines
100TMax Pressure
3.2mMax Length
CNC Bending
04
Phase 04

Robotic & Manual
Welding

Strength you can trust. To guarantee consistent quality for high-volume orders, we deploy 5 automatic welding robots operating 24/7, combined with our certified manual TIG/MIG welding experts.

5Auto Robots
24/7Operation
Robotic Welding
05
Phase 05

Finishing &
Smart Assembly

We take your product across the finish line. Beyond premium surface finishing, Dongji excels in electro-mechanical assembly. We integrate wiring harnesses and IoT sensors directly into your enclosures, delivering market-ready smart devices.

IoTIntegration
100%Func. Tested
Smart Assembly
Interactive Hover Grid | Dongji

Built on Quality.
Driven by Data.

Beyond advanced machinery, our true advantage lies in our unwavering commitment to precision systems and global standards.

Smart Factory ERP System
Smart Factory
Driven

Smart Factory Driven

Powered by deeply integrated ERP and MES systems, we guarantee real-time production tracking, transparent order management, and zero guesswork on the factory floor.

Precision Testing Lab
In-House
Testing Lab

In-House Testing Lab

Every batch is verified. We don't just inspect the surface; we conduct rigorous dimensional, material, visual, and complete functional testing right on our premises to ensure 0.1mm tolerance.

Global Compliance
Global
Compliance

Global Compliance

Fully certified to meet the world's strictest standards (ISO9001, UL, CE, FCC, KC). Your smart enclosures are ready for global deployment the moment they leave our dock.

Ready to scale your production?

Upload your 3D models or CAD blueprints today for a comprehensive DFM (Design for Manufacturing) review and an expedited quote.

SECURE UPLOAD .STEP / .IGES / .PDF / .DWG
Request a Quote

Leading Excellence in Precision Sheet Metal Manufacturing

At Dongji Intelligent Equipment, we redefine the standards of Precision Sheet Metal Manufacturing. Backed by over 15 years of OEM/ODM expertise, our 30,000㎡ Industry 4.0 manufacturing facility is a powerhouse of technological innovation. Our commitment to quality is validated by ISO9001, CE, and UL certifications, making us the trusted factory source for global brands, including automotive giants like BYD. When you partner with us for Precision Sheet Metal Manufacturing, you gain access to an elite engineering team capable of delivering rapid prototyping within 14-21 days and official DFM quotations within 24 hours.

Our state-of-the-art production lines are strictly optimized for advanced Precision Sheet Metal Manufacturing. Equipped with 30,000W fiber laser cutters, 12 heavy-duty CNC bending machines (up to 3.2M length), and 24/7 robotic welding cells, we guarantee a rigorous machining accuracy of 0.1mm. Beyond raw metal forming, our fully integrated 12-step industrial lifecycle covers everything from eco-friendly powder coating (with a 5+ year warranty) to complex electro-mechanical assembly and IoT sensor integration. This ensures that every Precision Sheet Metal Manufacturing project we handle—whether it's a smart vending machine or an industrial enclosure—exceeds international export standards.

Buyer FAQ

Precision Sheet Metal Manufacturing — Questions Buyers Ask

What is precision sheet metal manufacturing?
The high-accuracy fabrication of metal parts and enclosures — laser cutting, CNC bending, welding, and finishing — held to tight tolerances (0.1mm at Dongji) for repeatable, production-grade quality.
What materials and thicknesses can you process?
Mild steel, stainless steel, aluminum, galvanized steel, copper, and acrylic, from 0.2mm to 30mm thick.
What tolerance can you hold?
0.1mm machining accuracy, verified in our in-house lab with dimensional, material, visual, and full functional testing on every batch.
How fast are prototypes and quotes?
Official DFM quotes within 24 hours, and rapid prototypes in 14–21 days.
Do you handle both low-volume and high-volume orders?
Yes — from 1-unit prototypes through mass production, with 5 welding robots running 24/7 for high-volume consistency.
Which industries do you serve?
EV charging enclosures, data center and server racks, medical equipment housings, industrial automation control, commercial kitchen equipment, smart vending, and automotive (ODM partner for BYD).