Sheet Metal Fabrication Companies in China
Drawing Format: STEP, STP, STL, DWG, DXF, IGS, X_T, AI, PDF.
Packages:Bubble Bag, Polybag, Pearl cotton, Carton box, Wooden case/Pallet or as Requested.
Shipping: Shipped by sea, air or express(EMS,UPS,DHL,TNT, FedEx.etc), please confirm with us before placing orders.
Delivery Lead time: 7-15 days for small quantity and 30 days for large volume.
Surface treatment: Natural, Anodizing, Powder Coating, Sandblasting, Electrophoresis, Passivation, Zinc/Chrome/Nickel Plating, Vacuum Plating, Brushing, Polishing, Wire drawing, Grinding, Blackening, E-coating.etc.
Please tell us about your project, including materials, color, quantity, surface treatment, any packing or other requirement.
Provide us as much information as you can so that we could evaluate you an accurate quotation, click here to email us the drawings.
Main Services: Laser Cutting/CNC Machining/Punching/Hydraulic Deep Drawing/Bending/Riveting/Welding/Surface Treatment/Packaging
Controlling the quality of sheet metal parts involves a systematic approach that covers design, material selection, manufacturing processes, inspection, and corrective actions. Below is a step-by-step guide to ensuring high-quality sheet metal parts:
1. Design & Engineering Controls
Tolerances & Specifications: Define clear dimensional tolerances, bend radii, hole sizes, and surface finish requirements based on industry standards (e.g., ISO 2768, ASME Y14.5).
DFM (Design for Manufacturability): Ensure the design is optimized for sheet metal fabrication (e.g., avoiding sharp corners, maintaining uniform thickness).
CAD & Simulation: Use CAD software (SolidWorks, AutoCAD) and FEA simulations to predict deformations and stresses.
2. Material Quality Control
Raw Material Inspection:
Verify material grade (e.g., ASTM A366 for steel, Aluminum 5052).
Check for surface defects (scratches, rust, warping).
Ensure thickness consistency (using micrometers or calipers).
Certification: Require material certifications (MTR – Mill Test Reports) from suppliers.
3. Manufacturing Process Control
Cutting (Laser, Plasma, Punching, Waterjet)
Monitor kerf width, edge roughness, and dimensional accuracy.
Check for burrs, dross, or thermal distortion.
Bending (Press Brake, Folding)
Validate bend angles with a protractor or angle gauge.
Use proper tooling to avoid cracks or springback.
Inspect for wrinkles or deformations at bends.
Forming & Punching
Check for thinning, cracks, or splits in deep-drawn parts.
Ensure proper die alignment to prevent misforming.
Welding & Joining (TIG, MIG, Spot Welding)
Inspect weld penetration, porosity, and spatter.
Perform destructive/non-destructive testing (X-ray, dye penetrant).
Surface Treatment (Powder Coating, Plating, Anodizing)
Check coating thickness (using a coating thickness gauge).
Verify adhesion (cross-cut test) and corrosion resistance (salt spray test).
4. Inspection & Testing
First Article Inspection (FAI): Verify the first batch against design specs.
Dimensional Checks:
Use calipers, micrometers, CMM (Coordinate Measuring Machine).
Check flatness, parallelism, and hole positions.
Visual Inspection: Look for scratches, dents, or discoloration.
Functional Testing: Test assemblies for fit and function (e.g., screw hole alignment).
Statistical Process Control (SPC): Monitor production trends to detect deviations early.
5. Documentation & Traceability
Maintain records of inspection, material batches, and process parameters.
Implement a Lot Tracking System for defect tracing.
6. Corrective Actions & Continuous Improvement
Root Cause Analysis (RCA): Use 5 Whys or Fishbone diagrams for defects.
Process Optimization: Adjust machine settings, tooling, or operator training.
Supplier Feedback: Work with material suppliers to improve quality.
Common Defects & Solutions
Defect Possible Cause Solution
Burrs Dull cutting tools Deburring, tool replacement
Warping Uneven heating/cooling Proper clamping, stress relief
Cracks at bends Wrong bend radius/material Adjust tooling, anneal material
Misaligned holes Incorrect CNC programming Re-calibrate machine, verify CAD file
Poor weld strength Incorrect welding parameters Adjust current/speed, clean surfaces
Standards & Tools for Quality Control
ISO 9001: Quality management system.
GD&T (Geometric Dimensioning & Tolerancing): Ensures precise specifications.
SPC Software: Minitab, QI Macros for statistical analysis.
By implementing these steps, you can ensure consistent, high-quality sheet metal parts that meet customer requirements, industry standards and checklist for daily quality audits.
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