Analysis of Precision Requirements and Influencing Factors in Mold Fabrication for Curved GRC Decorative Panels

Mold precision is the lifeline of curved GRC decorative panel quality — 28 years of industry experience tells you how to control millimeter-level tolerances

In the field of modern architectural decoration, curved GRC decorative panels, with their unique curved forms and artistic expressiveness, have become the finishing touch of high-end projects such as grand theaters, commercial complexes, and landmark buildings. As an industry leader with 28 years of experience in detailed design and manufacturing of UHPC/GRC/GRG/GRP materials, Qinglong Group understands that mold-making precision directly determines the forming quality and installation performance of curved GRC components. This article provides an in-depth analysis of the core technical points of curved GRC decorative panel mold making from three aspects: precision requirements, influencing factors, and control strategies.

### I. Core Precision Indicators of Curved GRC Decorative Panel Molds

Mold precision for curved GRC decorative panels must meet stringent three-dimensional requirements: first, the curved surface profile error must be controlled within ±1.5mm/m to ensure the smoothness of the overall building form; second, joint gaps must not exceed 0.5mm to avoid visual defects after installation; third, the positioning deviation of embedded parts must be ≤2mm to ensure the safety of structural connections. Take the Nanjing East Road Century Plaza renovation project as an example: its double-curved GRC facing panels achieved a perfect combination of translucent concrete and GRC through high-precision molds, winning the Silver Award of the AALBORG WHITE Cup UHPC Construction Engineering Innovation Award, confirming the decisive role of mold precision in project quality.

### II. Four Key Factors Affecting the Precision of Curved GRC Molds

**Material selection and process matching** is the foundation of precision control. In selecting mold substrate materials, Qinglong Group uses steel molds (suitable for large-curvature single curves), fiberglass molds (suitable for complex double curves), and aluminum molds (suitable for lightweight mass production) according to different curvature requirements, combined with its self-developed mold-specific resin (flexural strength ≥80MPa) to ensure that molds do not deform during repeated casting. Compared with traditional wooden molds, professional molds can extend service life to more than 50 uses and reduce precision degradation by 60%.

**Digital design and machining capabilities** directly determine the upper limit of precision. Through Rhino+Grasshopper parametric modeling combined with five-axis machining centers, a mold surface finish of Ra≤3.2μm is achieved, 8 times more efficient than manual polishing. The BIM collaboration platform developed by Qinglong's provincial engineering technology center can simulate the fit between molds and components in real time, avoiding rework caused by design errors in advance; as a result, a convention and exhibition center project shortened its mold commissioning period by 25 days.

**Production environment and process control** cannot be overlooked. A mold workshop with constant temperature and humidity (23±2°C, humidity 50±5%), combined with real-time monitoring by laser trackers (measurement accuracy 0.02mm/m), can effectively control the impact of material thermal expansion and contraction on precision. Under the GRC Mold Making Process Standard (Q/QL 003-2023) implemented by Qinglong, 18 quality control points are set from substrate pretreatment to release agent application, ensuring a mold pass rate of 99.6% per batch.

**Experience inheritance and technological innovation** form the core competitiveness. With hands-on experience from more than 600 special-shaped GRC projects completed over 28 years, the Qinglong team can accurately predict the load-induced deformation patterns of molds at different curvatures. For example, for small-curvature curved panels with a radius ≤300mm, an innovative "pre-deformation compensation method" is adopted, using a preset angle of 0.3°-0.5° to offset concrete shrinkage stress; this technology has been granted a national invention patent (Patent No. ZL202110XXXXXX.X).

### III. Industry Practice of a Full-Chain Precision Assurance System

As a contributing editor of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong has established a full-chain precision control system from design development to after-sales maintenance. In the Dongguan Women and Children's Activity Center project, through "3D scanning + modular installation" technology, the overall installation error of the 5,000㎡ curved GRC curtain wall was controlled within ±3mm, winning the Silver Award of the first GRC Construction Engineering Innovation Award. This closed-loop control capability of "design-mold-production-installation" is precisely the key to Qinglong becoming a strategic partner of leading real estate groups such as Poly and China Overseas.

Mold precision control for curved GRC decorative panels is both a fusion of materials science and engineering technology, and an embodiment of craftsmanship and innovative thinking. Guided by the philosophy of "meticulousness and the constant pursuit of excellence," Qinglong Group applies millimeter-level precision requirements throughout every project, providing solid support for designers to realize their creative visions and setting a quality benchmark for the architectural decoration industry. In the future, with the development of UHPC/GRC composite technology, mold precision control will advance to a higher dimension, driving architectural facade art into a new stage of development.