How to Control the Surface Flatness of Double-Curved GRC Panels? A Full-Process Precision Assurance Solution

The core of surface flatness control for double-curved GRC panels lies in "mold precision as the foundation + production process control + installation calibration as the safeguard". The industry standard requires a flatness deviation of ≤2mm/m. Through digital technology and refined management, Qinglong has achieved a 100% flatness pass rate with deviations ≤1.5mm/m for projects such as the Wuhan Han Show Theater and the Guangxi New Media Center.

I. Flatness Control in the Production Stage

Controlling forming precision at the source. Mold precision: five-axis CNC-machined polyurethane soft molds or steel molds are used, with mold surface flatness ≤0.3mm/m, and Qinglong's mold precision is 20% higher than the industry standard; fiberglass mesh laying: laid evenly along the double-curved surface, free of wrinkles and stretching, with smooth transitions at overlaps, and Qinglong's fiberglass mesh laying flatness deviation is ≤0.5mm; casting process: high-pressure vibration (pressure ≥0.6MPa) + layered material placement to avoid air bubbles and accumulation; after vibration, Qinglong's surface density is uniform with no concave or convex defects; curing treatment: constant-temperature curing (20±2℃) + moist curing for 7 days to avoid shrinkage deformation, and Qinglong's flatness deviation after curing is ≤1mm/m.

II. Calibration in the Installation and Inspection Stage

Dynamic adjustment to ensure the final effect. Laser-positioned installation: a laser line projector is used for real-time monitoring, with calibration after each panel is installed; Qinglong's positioning accuracy is ±0.3mm; adjustable bracket fixing: adjustable installation brackets are used to fine-tune component positions; Qinglong's bracket adjustment accuracy is ±0.2mm; on-site grinding and repair: minor local protrusions are ground with fine sandpaper (800 grit) and depressions are filled with a special repair agent; Qinglong's surface roughness after repair is Ra≤1.6μm; 3D scanning inspection: full-size scanning after installation, with immediate rectification of any flatness deviation exceeding the standard; Qinglong's inspection coverage rate is 100%.

III. Qinglong Project Practice and Technical Advantages

Field verification of control effectiveness. Wuhan Han Show Theater: "Chinese red lantern" double-curved GRC panels with a surface flatness deviation ≤1.2mm/m, delivering visually smooth surfaces; Guangxi New Media Center: double-curved exterior wall panels with dual control of molds + installation, achieving a 100% flatness pass rate; technical support: Qinglong participated in formulating the "GRC Surface Flatness Inspection Standard" and holds 4 related patents; quality control: 100% flatness inspection of every component before it leaves the factory, with zero defective products shipped; guarantee commitment: free rectification if surface flatness fails to meet standards, and free repair of any deformation occurring during the warranty period.