Interlocking Paver Block Mould Design

Fundamental Design Objectives

Every interlocking paver block mould must satisfy multiple performance criteria simultaneously. The interlock geometry-whether dog-bone, S-curve, X-shape, herringbone, or custom profile-must provide sufficient mechanical engagement to prevent vertical displacement under traffic loading while allowing adequate horizontal flexibility for thermal movement . The mould cavity must produce faces sufficiently smooth for comfortable pedestrian traffic, yet textured enough for slip resistance in wet conditions.

Our interlocking paver block mould design process begins with comprehensive CAD/CAE integration. Finite element analysis allows our engineers to simulate stress distributions under actual wheel loads, evaluating contact pressures at interlock interfaces and identifying potential stress concentration points that could lead to corner cracking or edge spalling . This computational approach enables optimization of interlock depth, flank angle, and transition radii before any steel is cut, ensuring that the final mould geometry delivers superior performance across its entire service life.

Material Selection and Metallurgical Excellence

The foundation of durable interlocking paver block mould performance lies in material quality. We specify vacuum-degassed alloy tool steels such as Cr12MoV, 9CrSi, and 42CrMo, materials offering optimal combinations of hardness potential, wear resistance, and toughness . These steels undergo multi-directional forging that refines cast grain structures into uniform, fine patterns essential for withstanding the abrasive action of quartz-rich concrete mixes.

Our heat treatment processes are equally critical to mould performance. Preliminary heat treatment includes spheroidizing annealing, creating uniformly distributed carbide networks that respond predictably to subsequent hardening processes . Through vacuum quenching at 980 °C followed by tempering at 580 °C, and carburizing that hardens the surface layer to HRC 58-62 while maintaining a tough core at HRC 35-40, every interlocking paver block mould achieves consistent metallurgical performance with minimal dimensional distortion . This dual-phase hardness prevents cracking from vibration impact while resisting abrasion from concrete aggregates, delivering an expected operational lifespan of 80,000 to 120,000 cycles under normal production conditions .

Precision Manufacturing for Exact Geometry

Interlocking pavers require exacting dimensional accuracy. Imperfections in the mould result in uneven gaps, poor locking, increased waste, and premature pavement failure. UNIK's interlocking concrete paver moulds are produced through several controlled processes that ensure every cavity produces pavers with identical profiles, smooth release, and low surface defects .

Our CNC machining technology guarantees exact cavity dimensions with tight tolerances of ±0.1mm and a surface finish of Ra 1.6 or better . Critical design details include a 1.5° draft angle per side for smooth hydraulic ejection and prevention of under-cut stress, 3-5mm radius on all internal corners to eliminate stress concentration points that could lead to fatigue cracks, and 0.3mm pre-compaction allowance to accommodate steel rebound during pressing .

Large-scale Coordinate Measuring Machine (CMM) capability-rare among domestic mould manufacturers-enables full three-dimensional verification of cavity geometries . This ensures that critical dimensions such as unilateral clearance between presser foot and mould cavity (0.2-0.4mm), flatness of the whole board (≤0.5mm), and dimensional deviation of each cavity (-0.3 to +0.3mm) consistently meet design specifications .