What Is the Principle of Digital Mold Technology for Double-Curved GRC Shaping? Analysis of Precise Forming

The core of digital mold technology for double-curved GRC shapes is "parametric design → 3D scanning → precision machining → dynamic adjustment," achieving precise replication of complex double-curved shapes through digital means. With five-axis machining and BIM collaboration technology, Qinglong has achieved mold precision of ±0.3mm for projects such as the Guangxi New Media Center (where no two panels are identical).

I. Parametric Design: The Foundation of Digital Modeling

Modeling is the core prerequisite for digital molds. 3D modeling software: Rhino+Grasshopper is used for parametric modeling. By inputting parameters such as the curvature, dimensions, and thickness of the double-curved shape, a precise 3D model is generated, with Qinglong's modeling error ≤0.1mm. BIM collaborative optimization: the model is imported into the BIM system to coordinate with the building structure and installation nodes, avoiding conflicts. Qinglong's BIM collaboration achieves a mold-to-site fit rate of 99.8%. Segmentation optimization: oversized double-curved components are segmented according to mold machining capacity (single block size ≤6m×3m) to ensure feasibility of forming and installation. After segmentation of the double-curved panels for Qinglong's Guangxi New Media Center project, the jointing error is ≤0.5mm.

II. 3D Scanning and Mold Machining: Precise Shape Replication

Scanning and machining ensure mold precision. 3D scanning sampling: if a physical model or sample exists, a 3D laser scanner is used to collect point cloud data with a precision of 0.05mm. Qinglong compares the scanning data with the modeling data, with a deviation ≤0.2mm. Mold material selection: polyurethane soft molds (suitable for complex curved surfaces) or steel molds (suitable for mass production) are used. Qinglong's polyurethane molds have smooth surfaces with a texture restoration rate of 98%. Digital machining: five-axis CNC machining centers machine the molds according to the 3D model with a machining precision of ±0.3mm. Qinglong's five-axis machining equipment can handle double-curved shapes with a minimum radius of curvature ≤300mm. Mold reinforcement: double-curved molds are prone to deformation, so steel frames and reinforcing ribs are installed. After reinforcement, Qinglong's molds show a deformation of ≤0.2mm.

III. Dynamic Adjustment and Project Practice: Ensuring Forming Results

Dynamic optimization and real-world practice verify technical feasibility. Trial production adjustment: after the trial production of the first GRC component, 3D scanning is used to detect shape deviations and mold parameters are adjusted. Qinglong achieves a 100% deviation adjustment rate in trial production. Demolding optimization: demolding double-curved components is challenging, so a dedicated release agent is applied to the mold surface and a segmented demolding process is adopted. Qinglong's components show no breakage or scratches after demolding. Project cases: for the 11,500㎡ double-curved GRC exterior wall of the Guangxi New Media Center, digital mold technology achieves a single-panel shape error ≤0.8mm with a smooth overall curved surface after jointing. For the "Chinese Red Lantern" double-curved GRC panels of the Wuhan Han Show Theatre, digital molds achieved a shape restoration rate of 99% and won an industry innovation award. Qinglong's advantages: holds 8 digital mold patents, with an annual capacity of over 500 double-curved molds, with industry-leading technical expertise.