Differences in Mold Requirements Between UHPC Single-Curved and Double-Curved Panels and Key Technical Analysis

In the field of modern architectural decoration, UHPC (Ultra-High Performance Concrete) has become the material of choice for high-end projects such as landmark buildings and commercial complexes thanks to its outstanding mechanical properties and expressive formability. Among its applications, single-curved panels and double-curved panels are typical forms of UHPC, and their mold design and manufacturing directly determine product precision and project implementation results. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on its full-chain technical accumulation to provide an in-depth analysis of the core differences between the two in mold requirements and the key technical breakthroughs, offering professional solutions for designers and owners.

1. Mold Design Logic: A Technical Leap from Linear to Nonlinear

The core difference between UHPC single-curved panel molds and double-curved panel molds stems from the fundamental distinction in the curvature characteristics of the components. Single-curved panel molds rely on linear bending in a single direction; their mold structure is based on a flat plane, and forming can be achieved simply with steel or GRP templates of fixed curvature, so the technical barrier is relatively low. Take, for example, a sunshade panel project for a commercial complex undertaken by Qinglong Group: the single-curved panel molds adopted a modular steel mold design combined with CNC cutting technology, achieving dimensional precision control of ±0.5mm and a 30% increase in production efficiency over traditional processes.

Double-curved panel molds, by contrast, face the complex challenge of bidirectional curved surfaces. Their molds must accommodate curvature changes in both the X-axis and Y-axis directions simultaneously, placing stringent demands on 3D modeling and the control of elastic deformation of materials. Qinglong Group integrates a parametric design platform (Rhino+Grasshopper) with BIM technology to build digital models of double-curved surfaces, and then combines 3D scanning reverse engineering to ensure the deviation between the mold surface and the design model is controlled within ±1mm. In the Century Plaza renovation project on Nanjing East Road, the light-transmitting UHPC double-curved panel molds adopted an aluminum alloy honeycomb composite structure, which not only ensured the supporting strength of the curved surface but also reduced the self-weight by 40%, solving the forming challenge of large-span double-curved components.

2. Material Selection and Process Adaptation: The Art of Balancing Rigidity and Flexibility

For single-curved panel molds, material selection focuses more on balancing cost and efficiency. Qinglong Group typically uses Q235 steel plates formed by laser welding, with sandblasting plus fluorocarbon coating treatment on the surface, ensuring that the UHPC slurry does not stick to the mold and that the surface finish reaches Ra1.6μm. For mass production needs, the mold design life can exceed 500 uses, and standardized interfaces enable quick replacement and maintenance.

Double-curved panel molds, on the other hand, must balance surface conformity with demolding convenience. Qinglong's technical team innovatively adopted a composite system of "flexible base layer + rigid skeleton": the base layer uses imported polyurethane elastomer (Shore hardness 85A), precisely replicating the double-curved surface through CNC engraving; the skeleton is welded from high-strength aluminum alloy profiles, with a multi-point adjustable support structure enabling fine adjustment of the curved surface. This combined solution not only solves the problem that traditional steel molds cannot adapt to complex curved surfaces, but also avoids the deformation risk of purely flexible molds. In the Dongguan Women and Children's Activity Center project, this technology successfully achieved one-time forming of double-curved UHPC components with a minimum curvature radius of 300mm, with a surface texture reproduction rate of 98%.

3. Core Technical Breakthroughs: The Deep Integration of Digitalization and Industrialization

To address the technical difficulties of double-curved panel molds, Qinglong Group, relying on its national-level R&D center platform, has formed three key technical systems: first, the construction of a parametric mold library—by accumulating data from 1,000+ double-curved projects, a database covering curvature, dimensions, and material parameters has been established, enabling rapid reuse of molds for similar projects; second, mold surface compensation technology—based on the shrinkage rate of UHPC material (0.03%) and its elastic rebound characteristics, compensation allowances are preset at the mold design stage to ensure components meet precision requirements after forming; third, an intelligent temperature control system—temperature sensors are embedded inside the molds to monitor the temperature field distribution during casting in real time, preventing surface deformation caused by temperature differences.

As a participating drafting unit of the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)", Qinglong Group has incorporated mold technology innovation into its full-chain quality control system. From mold feasibility analysis at the detailed design stage, to 3D scanning quality inspection during production, and then to mold reuse evaluation at the installation stage, a closed-loop management system has been formed. At present, Qinglong's Guangxi production base is capable of producing 600,000 square meters of UHPC components annually, with a 100% self-sufficiency rate for double-curved panel molds, reducing costs by 45% compared with reliance on external customization and shortening delivery cycles by 20 days.

Whether it is the efficient, standardized production of single-curved panels or the complex, customized forming of double-curved panels, mold technology remains the core vehicle for releasing the value of UHPC materials. Building on 28 years of industry experience, Qinglong Group continues to break through mold technology bottlenecks through the deep integration of digital design, new material applications, and intelligent manufacturing, providing a solid guarantee for bringing architectural creativity to life. In the future, as UHPC is widely applied in irregular-shaped buildings, landscape art, and other fields, mold technology will embrace more possibilities for innovation, and Qinglong will continue to uphold its mission of "Creating Beautiful Architecture", driving technological upgrading and industrial development in the new architectural decoration materials industry.