What Are the Parting Principles for Complex GRC Shapes? Analysis and Practical Application of Parting Principles

For complex GRC shapes featuring irregular forms and varied curved surfaces, mold parting design is the core link in production and construction. Scientific parting principles can balance production efficiency, mold cost, and shape precision. Drawing on its experience in complex projects such as the Dongguan Women and Children's Activity Center, Qinglong analyzes the core principles and practical key points of mold parting to support the realization of complex shapes.

1. Shape Integrity and Aesthetics Priority Principle

Mold parting must ensure shape integrity and avoid compromising the aesthetic expression of the design. Concealed parting lines: place parting lines at shape transitions, internal corners, or visually blind areas to avoid exposure on primary viewing surfaces; for example, the parting lines of the GRC curtain wall at Shenzhen Longhua Xiangshan Science and Technology Park are all set at the internal corners of component joints. Curved surface continuity: when parting molds, ensure the curved surface of each single component remains continuous and avoid arbitrarily dividing a complete curved surface; parting for double-curved shapes must follow the principle of "one component, one dominant curvature" to reduce surface joining discontinuities. Preservation of decorative details: for decorative details such as reliefs and carvings, parting lines must avoid detail areas to keep decorative elements intact; in the Nanning Fengjingwan French-style relief project, Qinglong preserved the integrity of all carved details through precise parting.

2. Production Feasibility and Efficiency Optimization Principle

Mold parting must fit production processes to improve production efficiency and yield. Rationalized component dimensions: the weight of a single GRC component should be controlled within 50-150 kg with an area of no more than 3 m² for easy handling and production; extra-large shapes adopt modular parting, as with the roof GRC of the Hainan International Convention and Exhibition Center, where the area of each component after parting is kept within 2.5 m². Maximized mold reuse: components of the same shape type adopt a unified parting standard to increase mold reuse rates and reduce mold costs; in the Guangzhou Xinghewan series of projects, Qinglong achieved a mold reuse rate of over 60% through standardized parting. Easy demolding: demolding angles must be considered during parting to avoid undercuts or complex cavities, ensuring components can be demolded smoothly and reducing production damage; the demolding angle should be no less than 5°, and complex areas require draft angles.

3. Structural Stability and Construction Adaptability Principle

Mold parting must take into account both structural safety and on-site construction convenience. Rational load bearing: parting lines must avoid weak load-bearing areas of components, and parting joints should be set at stiffening ribs or load-bearing keel positions to improve overall strength after joining; parting for large suspended GRC shapes must ensure balanced load distribution for each component. Installation feasibility: parting must consider on-site hoisting and installation space, reserving sufficient operating space and positions for connector installation; components for work at height should be parted into smaller, lighter pieces for easier hoisting. Simplified joining: adopt "mortise-and-tenon" or "flange-type" parting joints to simplify on-site joining processes and improve installation efficiency; in the Shenzhen Pingshan High-tech Zone project, Qinglong improved joining efficiency by 40% through mortise-and-tenon parting.

4. Practical Application and Precautions of Parting Principles

Apply parting principles flexibly according to actual project conditions to avoid risks. Parting process: 3D model refinement → parting line planning → mold design → sample production verification → batch parting production; Qinglong sets review checkpoints at each stage to ensure reasonable parting. Precautions: material shrinkage must be considered during parting, with a 1-2 mm shrinkage gap reserved; parting for complex double-curved shapes should incorporate digital mold technology to ensure joining precision; the parting plan must be jointly confirmed with designers, production teams, and construction teams to avoid later rework; in the Guangxi New Media Center double-curved project, Qinglong achieved zero rework and efficient delivery through multi-party collaborative parting.