What Are the Precision Requirements for Mold Making of Curved GRC Decorative Panels?

The mold manufacturing precision for curved GRC decorative panels must meet "dimensional deviation ≤±0.8mm, curved surface precision ≤±0.5mm, and joint gap ≤0.3mm," which is essential for the smoothness of curved shapes and installation fit. Through CNC machining and 3D inspection, Qinglong achieves a 100% mold precision compliance rate, with double-curved/single-curved projects such as the Guangxi New Media Center and Hainan Poly Peninsula No. 1 all achieving perfect forming.

1. Core Precision Indicators: Quantified Control of Curved Quality

Precision indicators directly determine the forming quality of curved panels. Dimensional deviation: mold arc length, chord height, and radius deviations ≤±0.8mm ensure curved panels match design dimensions; Qinglong uses laser rangefinders for inspection, achieving dimensional precision of ±0.1mm. Curved surface precision: deviation of any point on the curved surface from the design surface ≤±0.5mm, with no "sagging" or "bulging"; Qinglong uses 3D laser scanning inspection, achieving a surface fit of 99.5%. Joint precision: when multiple molds are joined, joint gaps ≤0.3mm and joint surface flatness ≤0.2mm/m prevent slurry leakage and surface steps; Qinglong fills joints with sealant, achieving a slurry leakage rate of 0. Angular deviation: angle deviation of curved corner molds ≤±0.3° ensures smooth corners; Qinglong uses digital angle gauges for angle inspection with a precision of ±0.05°.

2. Mold Materials and Machining Processes: The Foundation of Precision Assurance

Materials and processes determine the upper limit of mold precision. Mold materials: GRP molds (surface roughness ≤0.05mm) or steel molds are preferred, while wooden composite molds (for small batches) can be used for single-curved panels; Qinglong's curved molds are mainly GRP, with a service life of ≥50 uses. Machining processes: single-curved molds use three-axis CNC machining, while double-curved molds use five-axis CNC machining, precisely milled according to BIM 3D models with machining errors ≤±0.1mm; Qinglong's five-axis machining equipment has a spindle speed of ≥15000rpm, leaving no tool marks on curved surfaces. Mold reinforcement: curved molds bear uneven forces and require reinforcing ribs (spacing ≤600mm), with double-curved mold rib spacing ≤400mm; Qinglong's reinforcing ribs are made of square steel, increasing mold rigidity by 40% with no deformation during pouring.

3. Qinglong's Precision Control and Project Practice

Full-process control ensures stable mold precision. Mold calibration: after machining, pre-assembly is performed and curved surface precision is re-verified with 3D laser scanning, with non-conforming areas immediately reworked; Qinglong's precision deviation after pre-assembly calibration is ≤±0.3mm. Trial production verification: after the first curved panel is produced, its dimensions and surface precision are tested to reversely calibrate the mold; Qinglong's first-article inspection pass rate reaches 95%, and molds with excessive deviations are rectified within 24 hours. Demolding design: single-curved molds can be demolded as a whole, while double-curved molds use segmented demolding (each segment ≤1.5m long) to avoid damaging the curved surface; Qinglong's segmented molds feature hidden joint designs that do not affect appearance. Project cases: the double-curved GRC decorative panels at the Guangxi New Media Center use molds measuring 6000×3000mm with surface precision ≤±0.3mm; after forming, the double-curved lines are smooth with no visible seams after installation. The single-curved GRC panels at Hainan Poly Peninsula No. 1 have mold radius deviations ≤±0.5mm with a curved surface fit of 99.8%.