Differences in Mold Requirements Between UHPC Single-Curved and Double-Curved Panels and Analysis of Key Influencing Factors

In the field of architectural decorative materials, UHPC (Ultra-High Performance Concrete) has become a key material for shaping architectural aesthetics with its outstanding mechanical properties and molding potential. Single-curved panels and double-curved panels, as common forms in UHPC applications, differ in mold requirements, which directly affect project cost, schedule, and final presentation. Drawing on Qinglong's 28 years of full-chain experience in detailed design and manufacturing of UHPC/GRC/GRG/GRP materials, this article provides an in-depth analysis of the core differences between the two in mold design and the key influencing factors, offering professional reference for designers and owners.

1. Core Differences in Mold Design Between UHPC Single-Curved Panels and Double-Curved Panels

From geometric form to process implementation, the mold requirements of single-curved and double-curved panels show significant divergence. Single-curved panels (such as flat or single-direction curved components) have relatively simple mold structures, typically using modular steel molds or composite wooden molds, with precision requirements met through linear parameter control. Taking a commercial complex facade project that Qinglong participated in as an example, the single-curved UHPC sunshade panel molds achieved standardized production through CNC machining, reducing the mold cost per piece by about 30% and improving production efficiency by 40%.

In contrast, double-curved panels (such as double-curved curtain walls and special-shaped sculptures) involve curvature changes in two directions, placing higher demands on the three-dimensional precision and structural stability of molds. In Qinglong's translucent concrete project at Century Plaza on Nanjing East Road, three-dimensional scanning and parametric modeling technologies were adopted to control the mold error of double-curved panels within ±0.5mm, ensuring the seamless assembly of more than 1,000 special-shaped components. Such molds require customized steel frames and elastic linings, with production costs approximately 2-3 times those of single-curved panel molds and production cycles extended by more than 30%.

2. Analysis of Key Factors Affecting Mold Design

1. Form Complexity and Precision Control: The double-curvature characteristics of double-curved panels require molds with higher surface-fitting capabilities. Through BIM technology and Rhino parametric design, Qinglong converts designers' creative models into producible mold data, combined with 3D-printed master mold technology to achieve precise replication of complex forms. Compared with traditional manual lofting, digital mold design raises the form restoration rate of double-curved panels to over 98%.

2. Material Fluidity and Forming Pressure: The high viscosity of UHPC requires molds with sufficient rigidity and sealing performance. Single-curved panel molds can adopt conventional casting processes, while double-curved panels are prone to air bubbles and stress concentration due to surface variations, requiring optimization through vacuum casting and step-by-step pressurization techniques. The fully automated hydraulic forming equipment at Qinglong's Guangxi production base enables dynamic pressure adjustment for double-curved components, reducing forming defects.

3. Demolding and Reuse Efficiency: Single-curved panel molds allow quick demolding and standardized reuse (typically reusable more than 50 times), while double-curved panel molds, due to their unique forms, require special release agents and segmented disassembly structures for each demolding, with reuse generally not exceeding 20 times. Through nano-coating treatment of mold surfaces, Qinglong has extended the reuse life of double-curved panel molds to 25 times, lowering overall costs.

3. The Value of Full-Chain Service in Mold Optimization

As a national high-tech enterprise integrating detailed design, manufacturing, and construction installation, Qinglong incorporates full life-cycle thinking at the mold design stage. For example, in the GRC project of the Dongguan Women and Children's Activity Center, by getting involved in the design phase early, the molds of double-curved components and the installation lifting points were designed as an integrated whole, which not only reduced mold complexity but also improved on-site installation efficiency. This "design-production-construction" collaborative model reduced the project's mold cost by 15% and shortened the construction period by 20%.

Whether it is the efficient standardized production of single-curved panels or the customized precision manufacturing of double-curved panels, molds, as the core carriers for forming UHPC components, have a design quality that directly determines product quality and project economics. With 28 years of industry experience and 58 patented technologies, Qinglong continuously optimizes mold processes, providing designers with full-chain solutions from concept to realization. In the future, with the deep integration of parametric design and intelligent manufacturing, UHPC mold technology will develop toward greater precision, economy, and environmental friendliness, injecting more possibilities into the field of architectural decoration.