PR313 – Precision Sheet Metal Enclosure | China Sourcing & Quality Control

Precision Sheet-Metal Enclosure with Controlled Zinc Coating for Industrial Electrical Cabinets

Finished precision sheet metal enclosure manufactured under strict zinc coating and dimensional control.

Project Overview

Project Code: PR313Product: Sheet-Metal Enclosure for Industrial Electrical CabinetsApplication: Internal module for electrical switchboardsManufacturing Scope: Laser cutting · Bending · Welding · Surface finishing · Zinc plating · QC · Packaging

At first glance, PR313 looks like a simple metal enclosure.In reality, it is a precision industrial component where mechanical rigidity, surface quality, coating compliance, and logistics protection all had to work together — without compromise.

This project is a clear example of why “simple metal parts” often fail when they are not engineered as a complete manufacturing system.

This precision sheet metal enclosure was developed as a process-driven industrial project, combining controlled welding, zinc coating compliance, and cosmetic surface protection for electrical cabinet integration.

Customer Requirements

The customer requested a compact enclosure designed to be installed inside industrial electrical cabinets, with the following critical requirements:

• Two-thickness steel design

  • Thin folded body for efficiency

  • Reinforced front plate to support selectors and knobs without flexing

• Strict zinc coating specification

  • Uniform zinc layer

  • Minimum coating thickness requirement (≥ 7 μm)

  • Any non-compliance = rejection

• Cosmetic front surface

  • No scratches

  • Clean appearance suitable for visible cabinet interfaces

• Safe packaging

  • No surface damage during handling or transport

Engineering drawings defining tolerances, material thickness, and assembly structure.

Why This Was Not a Trivial Job

Combining the following elements creates real industrial risk:

• Mixed material thicknesses (1.0 mm body + 3.0 mm front plate)

• Welded assembly (risk of distortion and misalignment)

• Visible interface surface

• Controlled zinc plating with minimum thickness requirements

• Logistics without cosmetic damage

This is exactly where many suppliers fail — not in cutting or bending, but in process control.

Front plate detail showing surface quality and reinforced thickness for visible industrial interfaces.

Engineering & Manufacturing Approach

SHAMANA treated PR313 as a process-driven engineering project, not a commodity part.

Design Structure

• Body:

  • 1.0 mm steel sheet

  • Laser cut → bent to shape

• Front Plate:

  • 3.0 mm steel

  • Laser cut separately

  • Provides rigidity and stable mounting for controls

Both components were engineered to work together during welding and plating.

Fabrication Flow

1. Laser Cutting All functional holes and openings were laser-cut to ensure positional accuracy and repeatability.

Laser cutting of steel components to ensure dimensional accuracy before welding.

2. Bending The enclosure body was bent with controlled tolerances, as bending accuracy defines final assembly geometry.

3. Fixture-Based Welding The front plate was welded to the body using controlled fixtures and weld sequencing to:

• Maintain flatness

• Protect hole alignment

• Minimize thermal distortion

Controlled welding process to prevent distortion and ensure structural rigidity.

4. Surface Preparation Front surfaces were prepared to meet both visual and plating requirements.

5. Zinc Plating with Thickness Control Zinc coating was treated as a functional specification, not a cosmetic step.

• White zinc plating (ISO 2081)

• Controlled racking strategy

• Thickness verification using coating measurement instruments

• Minimum zinc thickness: ≥ 7 μm

Measured values during QC confirmed compliance.

Quality control measurement verifying zinc coating thickness compliance before approval.

Quality Control Evidence

Quality checks included:

• Dimensional verification (example: 3.0 mm front plate thickness confirmed)

• Zinc coating thickness measurements

• Visual inspection of front surfaces

• Assembly alignment checks

This ensured every part met both mechanical and surface requirements.

Material thickness verification ensuring compliance with design specifications.

Individual protective packaging to prevent cosmetic damage during logistics and handling.

Material thickness verification ensuring compliance with design specifications.

Material thickness verification ensuring compliance with design specifications.

Quality control process video for precision sheet metal enclosure manufacturing

Packaging & Logistics Protection

Even a compliant part is unacceptable if it arrives damaged.

Each enclosure was:

• Individually protected in plastic bags

• Packed to avoid metal-to-metal contact

• Secured for transport inside cartons

Result: scratch-free, production-ready parts upon delivery.

Individual protective packaging to prevent cosmetic damage during logistics and handling.

Individual protective packaging to prevent cosmetic damage during logistics and handling.

What the Customer Received

• A production-ready, two-thickness steel enclosure

• Stable welded geometry with controlled front flatness

• Verified zinc coating compliance

• Clean cosmetic finish

• Logistics-safe packaging

• A repeatable manufacturing process suitable for series production

Finished precision sheet metal enclosure manufactured under strict zinc coating and dimensional control.

Video documentation of quality control procedures applied during manufacturing.

Why This Case Matters

PR313 demonstrates a core industrial truth:

Simple parts are rarely simple.

When mixed materials, welding, cosmetic requirements, and strict coating specifications come together, success depends on engineering the entire supply chain — not just the drawing.

This is exactly where SHAMANA adds value.

Start a pilot run