From Sheet Metal to Final Assembly: Changyun Intelligent Technology Redefines Custom Power Cabinet Manufacturing with Full-Process Digital Intelligence
In the electrical switchgear industry, "non-standard customization" is the norm – but also the pain point. Every low‑ and high‑voltage power distribution cabinet must not only meet core parameters such as voltage level and current capacity, but also adapt to different project sites, environmental conditions, and special functional requirements. In recent years, Changyun Intelligent Technology Co., Ltd. has been deeply committed to custom power cabinet services. With “full‑process digital and intelligent upgrading” as its core strategy, the company has fully connected the entire smart manufacturing chain – from sheet metal processing to secondary wiring, and from welding to final assembly and testing – delivering a customisation solution that stands out in the industry.
Addressing the Pain Point of Non‑Standard Customization: The “Thousand Faces, Thousand Cabinets” That Traditional Models Can’t Support
A defining characteristic of the electrical switchgear industry is precisely “non‑standard customization” – every order requires a tailor‑made solution to meet the needs of different application scenarios. The demand for customised indoor and outdoor box‑type power equipment is especially high. Multi‑variety, small‑batch mixed‑line production is difficult; conventional fixed‑station assembly suffers from long changeover cycles and low efficiency. In addition, data silos across R&D, production, warehousing, and logistics create high delivery risks.
“Customers want products that fit their needs perfectly, but they also expect short delivery times and reliable quality. This is a huge challenge for traditional production models,” said Mr. Zhang, Production Director at Changyun Intelligent Technology. To systematically break through these bottlenecks, Changyun has adopted a technical framework of “data‑driven + intelligent equipment + flexible production lines” and launched a comprehensive smart manufacturing upgrade that runs from the sheet metal shop to the welding shop and final assembly, achieving full end‑to‑end digital integration.
Station 1: Sheet Metal Fabrication – Precision Forging from Steel Plate to “Skeleton”
The manufacturing of a power cabinet starts with a steel sheet. Changyun’s sheet metal shop has introduced an intelligent sheet metal production line that integrates automatic storage, intelligent punching/shearing, CNC bending, and forming. With deep integration of ERP and MES, it achieves end‑to‑end intelligent management from digital design to digital manufacturing.
Material selection – The company uses high‑quality cold‑rolled steel (grades SPCC, SECC, DC01, etc.) and galvanised steel, with sheet thickness ranging from 0.8 mm to 3.0 mm. Surfaces are degreased, silanised, and electrostatically powder coated (coating thickness ≥60 μm), passing ≥500 hours of salt‑spray testing without red rust, ensuring corrosion resistance in humid and saline environments.
Punching & shearing – The CNC punching‑laser cutting combo machine combines servo punch forming (punching force 25 tons, punching frequency up to 600 strokes/min) with a 3 kW fibre laser cutter. It can perform multiple tasks – punching, forming, scribing, engraving, and laser cutting – on complex contours. Maximum sheet size is 1500 mm × 4000 mm.
Bending – The bending unit (nominal pressure 120 tons, table length 3200 mm) is equipped with a high‑precision adaptive algorithm and intelligent control system. It compensates online for material variations and errors from previous processes, achieving closed‑loop high‑accuracy bending with a repeat positioning accuracy of ±0.05 mm. It also supports direct import of 3D models for automatic bending program generation. For sheet‑thickness inspection, a laser measurement system verifies material thickness in real time and automatically adjusts the bending stroke, keeping bend angle error within ±0.2°, meeting the requirements of GB/T 1804 fine tolerance class.
The fully automatic sheet metal line connects CNC punches, laser cutters, and CNC press brakes via an automated transport system and AGVs, with online monitoring throughout. Material handling – from loading, cutting, sorting, bending, to forming – is seamless, greatly improving frame machining accuracy and batch consistency. This intelligent sheet metal line has increased Changyun’s overall production efficiency by 35%, with a yield rate steadily above 99%.
Station 2: Intelligent Welding – Stronger, More Reliable Cabinet Connections
After precision forming, the sheet metal parts enter the welding stage. Changyun’s intelligent welding cell features a robotic arc welding system with high‑precision AI vision and laser scanning co‑positioning. Using CO₂ or mixed‑gas welding (welding wire ER50‑6, diameter 1.0/1.2 mm), the system automatically extracts weld seams, generates trajectories, and monitors weld quality in real time through high‑precision 3D vision and arc tracking – achieving fully “teach‑less” robotic welding. An AI algorithm analyses 12 key parameters – welding current (80–220 A), voltage (18–26 V), welding speed (30–60 cm/min) – for autonomous process adjustment and closed‑loop quality control. Weld penetration is ≥80% of base metal thickness, with no porosity, cracks, or undercut, meeting GB/T 15578 requirements.
“This system not only solves the industry’s pain points – labour shortages, low efficiency, and quality inconsistency – but also increases welding efficiency by over 40% and reduces labour intensity by about 60%,” said the welding shop manager. The intelligent welding cell is now fully used for automated welding of cabinet frames, brackets, and high‑precision components, significantly improving joint strength and long‑term operational reliability. The average tensile force at weld points exceeds 4500 N, well above industry standards.
Station 3: Secondary Wiring – Making the Cabinet’s “Neural Network” Highly Efficient and Smart
Sheet metal and welding form the cabinet’s “skeleton”; secondary wiring gives the distribution cabinet its intelligent control “neural network”. In traditional power cabinet manufacturing, secondary wiring is tedious, highly manual, inefficient, and error‑prone – a classic bottleneck. Changyun has adopted a fully digital approach for secondary wiring, using a pre‑fabricated wiring harness digital platform and dedicated templates. This breaks the deadlock of “waiting for the cabinet to arrive before starting work”, enabling “design on demand” and significantly shortening overall delivery times.
Wiring design – Strictly following GB/T 7251 and IEC 60439 standards, control circuits use multi‑strand flexible cables (RV, RVV types) rated at 450/750 V. Main circuits use BVR yellow/green earth wires and appropriate cross‑sections for current carrying capacity. Cables are laid by voltage and signal type in separate layers and troughs, with a minimum separation of 50 mm between power and signal lines to avoid electromagnetic interference.
Wiring operation – Changyun has introduced an AI‑vision‑assisted intelligent wiring system. A high‑resolution industrial camera (12 megapixels) recognises wire routes and terminal positions in real time (terminal crimp recognition accuracy ≤0.1 mm). An augmented reality projection system projects the wiring path and termination points directly onto the cabinet surface. Operators follow the projected guidance to quickly place wires and crimp terminals (crimp height and width checked by a closed‑loop force control system). Manual wiring errors are reduced to nearly zero, and every crimp’s pull‑force value is recorded, complying with GB/T 14315. The system automatically logs each harness’s configuration and connection data, creating a complete digital archive of the secondary wiring – invaluable for later troubleshooting and maintenance optimisation.
Station 4: Final Assembly and Testing – Full Traceability to Ensure Delivery Safety
After all core components (circuit breakers, contactors, thermal relays, instrument transformers, smart meters, etc.) are finished, they enter the final assembly workshop for integration and rigorous multi‑dimension factory testing. Using a full‑shop MES and IoT‑based sensing network, Changyun has deployed a multi‑modal AI quality inspection system that integrates image recognition and intelligent traceability, ensuring quality monitoring and assurance across the entire manufacturing process.
Factory tests strictly follow GB/T 7251.1‑2023 (Low‑voltage switchgear and controlgear assemblies) and GB/T 3906‑2020 (AC metal‑enclosed switchgear for rated voltages above 3.6 kV and up to 40.5 kV). Tests include:
- Main circuit power‑frequency withstand voltage (2.5 kV/1 min without breakdown)
- Insulation resistance (≥10 MΩ)
- Protection circuit continuity (≤0.1 Ω)
- Temperature rise test (1.1 times rated current, temperature rise ≤70 K)
- Functional mechanical operation (circuit breakers/disconnectors ≥5 cycles without sticking)
For custom products, optional special tests are available, such as internal arc fault classification (IAC), ingress protection verification (IP30 to IP66), and seismic testing (AG5 level).
“From sheet metal to welding, from wiring to final integration, all production data is uploaded to the cloud platform in real time,” said Changyun’s quality control manager. “Take a GGD low‑voltage switchboard as an example – every process parameter, operator, and test result is fully traceable with a ‘one‑cabinet‑one‑code’ system throughout its lifecycle. Our factory‑release pass rate is 99.7%.” Changyun Intelligent Technology has now built in‑house core capabilities for the entire process – from sheet metal drawing unfolding, punching/shearing, bending and welding, secondary wiring, to final assembly and testing. No key processes are outsourced, ensuring that custom products are fully quality‑controlled.
Customer Testimonial: Customised Services Driving Industrial Upgrading
Changyun’s full‑process intelligent upgrade is not just visible inside the workshop – it has been proven in real‑world projects across various industries. Take a new‑energy EV charging station project as an example. The customer required a batch of outdoor waterproof low‑voltage distribution cabinets with IP54 ingress protection, plus an integrated smart monitoring module for real‑time temperature, humidity, current, voltage, and remote communication. Changyun started with a thorough needs assessment: the engineering team visited the customer site, analysed working conditions, process flows, environmental parameters, and equipment load characteristics, and developed a tailored solution.
During production:
- The sheet metal team used the fully automatic flexible line to customise the cabinet structure – adding independent cooling air ducts and sealing against water ingress (polyurethane sealing gasket, third‑party verified IP54).
- The welding cell assembled the high‑precision frame, ensuring every weld’s strength and sealing met outdoor standards (continuous welds without porosity, pressure‑leak tested).
- The digital wiring platform designed the secondary harness for the smart monitoring module, and the intelligent lines delivered synchronously.
From design confirmation to finished product, the entire process took only 28 days – nearly 40% shorter than traditional methods. After delivery, the charging station’s operations manager commented: “Changyun not only gave us cabinets with precise dimensions, but the protection level and safety performance exceeded our expectations. The whole system has been running with rock‑solid stability.”
Continued Commitment: Forging Competitive Customisation Through Full‑Process Digital Intelligence
Today, the electrical switchgear industry is rapidly shifting from standardised mass production to flexible manufacturing and full‑lifecycle service. Changyun Intelligent Technology has built a complete value‑chain closed‑loop system covering R&D, production, sales, and service – based on the intelligent upgrading of sheet metal, welding, wiring, and final assembly – offering a one‑stop solution from drawing to delivery for non‑standard customised power distribution cabinets.
In the future, Changyun will continue to deepen the application of smart manufacturing and digital technologies, further optimise its flexible lines and AI quality inspection systems, and provide even more reliable, efficient, and accurate customised services – powering the construction of new‑type power systems and high‑quality industrial development.
For media inquiries or high‑resolution images, please contact Changyun Intelligent Technology Co., Ltd. press office.
