What Is the Principle of Digital Mold Technology for Double-Curved GRC Shapes? Curved Surface Forming and Qinglong Group's Intelligent Manufacturing

The core of digital mold technology for double-curved GRC shapes is a closed-loop system of "3D scanning point cloud acquisition, parametric algorithm optimization, and five-axis CNC precision machining," achieving millimeter-level conversion from design surfaces to physical molds. In the "Red Lantern" curtain wall project at the Wuhan Hanxiu Theatre, Qinglong Group acquired the architect's model through laser scanning (accuracy ±0.1mm), used Rhino+Grasshopper parametric software to optimize surface curvature (minimum radius R=300mm), and then machined tooling board molds on five-axis CNC machines (positioning accuracy ±0.02mm), ultimately achieving surface profile errors of ≤±1.5mm across 9,000 double-curved panels. Digital technology not only improves precision but also shortens the mold production cycle from a traditional 30 days to 7-10 days.

Point Cloud Acquisition and Surface Reconstruction

Laser scanners are used to acquire point cloud data of complex curved surfaces (density 1000 points/m²), and NURBS surfaces are generated through reverse engineering software. In the wave-shaped roof project at the Hainan International Convention and Exhibition Center, Qinglong Group used this technology to control deviations between the design model and the actual structure within ±3mm, providing a precise foundation for mold making.

Parametric Optimization and Mold Design

Algorithms automatically detect the developability of curved surfaces and optimize joint positions to reduce the number of molds. We have developed a dedicated plugin that automatically divides double-curved surfaces into machinable units and generates machining code. In the Nanning New Media Center project, parametric design reduced mold costs by 40%.

CNC Machining and Precision Control

Five-axis CNC machines mill the molds according to toolpath files, with a surface roughness of Ra≤0.8μm. Qinglong Group uses high-strength tooling board (density ≥1.0g/cm³), giving molds a lifespan of ≥500 uses. Full inspection with coordinate measuring machines ensures surface profile precision. Digital molds are the foundation for realizing complex shapes.