Most precision failures of large granite bases do not stem from insufficient machining accuracy, but spontaneous deformation caused by the release of hidden residual stress afterwards. Many small and medium processing factories only focus on passing pre-delivery inspections while ignoring the inherent structural stress of large stone components. Multiple residual stresses keep accumulating throughout the whole process of cutting raw granite blocks, cutting, grinding and lapping. These dormant stresses remain invisible in the short term. Nevertheless, they will release gradually under long-term equipment operation, alternating ambient temperature and humidity, and cyclic heavy loads, eventually leading to irreversible issues such as base warpage, datum shift and hole position deviation. ZHHIMG applies a dedicated multi-dimensional aging treatment process for large granite bases to eliminate dormant stress at the source and thoroughly avoid all deformation risks after product delivery.
Cutting stress generated during machining acts as the primary artificial trigger for precision drift of large bases. A large amount of stone material needs to be removed in rough machining of large granite bases. High-speed cutting, grinding, slotting, drilling and other operations exert compression and shear forces on the surface and interior of the stone, breaking the original stress balance and creating new machining residual stress. Such stress concentrates on weak areas including slots, surroundings of threaded holes and edge sections, which cannot be eliminated by conventional finish machining. Ordinary manufacturing skips the aging step and proceeds directly to fine grinding before shipment. Although the finished products seem to achieve perfect accuracy, their internal stress stays in a tense and unbalanced state. Later equipment vibration and temperature variation will trigger stress release and cause local deformation. ZHHIMG adopts staged aging after rough machining. Sufficient stress relief cycles are reserved after each heavy cutting operation to disperse concentrated cutting stress and homogenize the overall stress distribution of the base. 
Heavy-load simulated aging tests pre-emptively eliminate stress deformation induced by equipment loads. After installation, large granite bases bear continuous heavy loads from gantry frames, motion modules and fixtures. Micro stress forms inside the stone under compression. Without prior stress adaptation, long-term heavy loads will gradually bring slight bending and plane deviation of the base. ZHHIMG innovatively introduces dynamic heavy-load aging. After finish machining of the base, long-term static pressure holding is performed to simulate the actual heavy load condition at the customer site. The stone adapts to load forces in advance and releases pressure-induced residual stress. Bases calibrated by heavy-load aging will not suffer stress relaxation deformation under long-term bearing after installation, locking the datum precision for a long time.
This comprehensive multi-stage aging system enables ZHHIMG large granite bases to get rid of the common industry pain points of late precision drift and spontaneous deformation. Frequent calibration and maintenance are not required. The bases can serve high-end applications such as ultra-precision inspection, laser processing and semiconductor equipment for a long time while maintaining stable datum structure, delivering durable and reliable precision support for precision machinery.
Post time: Sep-20-2026