Granite bases are widely used in supporting structures for precision machinery, optical instruments, and large equipment due to their high hardness, low thermal expansion coefficient, and excellent chemical stability. However, improper long-term storage can often lead to degradation of their performance and even damage, compromising equipment stability and measurement accuracy. Many companies often overlook this issue in daily management, only realizing the importance of storage conditions for their lifespan when deformation or a decrease in accuracy occurs.
Environmental factors are one of the main causes of damage to granite bases. Although granite has an extremely low water absorption rate, high humidity environments can still allow moisture to penetrate tiny pores, causing mineral reactions, resulting in a decrease in surface hardness and increased localized scratches. Sustained high humidity can also foster mold growth, corrode the surface, and leave difficult-to-remove marks. Extreme temperature fluctuations are equally dangerous. Although granite has a low thermal expansion coefficient, repeated exposure to hot and cold temperatures causes different expansion rates in different areas, which can easily cause microcracks between grains. If these cracks continue to grow, they can compromise the base's overall load-bearing capacity. This damage is particularly devastating for bases supporting heavy machine tools or optical equipment. Furthermore, storage environments containing acidic or alkaline gases can gradually corrode the stone surface, reducing its smoothness, loosening its structure, and ultimately weakening its mechanical properties.
In addition to environmental impacts, physical damage is also a common source of problems with granite bases. During storage or transportation, if protective measures are not taken, dust particles or hard debris can easily scratch the surface, affecting contact accuracy. Bumps from handling tools can also lead to chipping or even cracking. Once the damage is severe, repair is difficult and costly. If the base is stacked for a long time or subjected to uneven pressure, it can develop permanent dents in localized areas, compromising its geometric accuracy. If the base is in direct contact with a metal support, rusting the support can contaminate the stone surface, accelerating the process of damage.
These damages will ultimately manifest themselves in performance degradation. The geometric accuracy of a granite base is crucial for ensuring reliable measurement and support. Poor storage conditions often lead to gradual deviations from standard flatness and verticality, resulting in measurement errors and unstable equipment installation. More insidiously, cracks and corrosion can alter granite's damping properties, reducing its vibration resistance, shifting its natural frequency, and increasing the risk of resonance. This degradation of dynamic performance can directly impact machine tool processing quality or the accuracy of experimental data.
To avoid these potential risks, systematic measures must be implemented in storage and management. The ideal storage environment should maintain a constant temperature and humidity, around 20℃ and a humidity level between 40% and 60%, away from sources of contamination such as acids and alkalis or welding workshops. The base surface must be protected from moisture and dust. Outer packaging can include multiple layers of moisture-proof paper, PE film, and wooden boxes, with desiccant placed in gaps. When storing, use a support frame with rubber or polyurethane feet to avoid direct contact with the ground or metal. Stacking should be strictly prohibited to prevent uneven pressure. During transportation, use soft straps and install protective measures at corners to prevent bumps.
In terms of daily management, it is recommended that companies establish a regular inspection system, recheck the flatness and verticality of the base annually, and return it to the factory for further repairs if necessary. Local scratches can be repaired with diamond paste, while cracks and corroded areas require prompt treatment and re-coating with a protective coating to extend their service life. Furthermore, labeling and personnel training should be implemented to ensure that warehouse staff adhere to standard handling procedures during handling and storage. Emergency plans should also be developed to ensure prompt action in the event of sudden environmental changes or damage.
The performance of granite bases depends not only on the inherent properties of the material but also on storage methods and management. Scientific environmental control, appropriate physical protection, and a standardized maintenance system can effectively extend the base's service life and ensure the equipment remains stable and reliable over the long term. For businesses, prioritizing this aspect not only avoids hidden costs associated with base damage but also ensures efficient and accurate production and testing throughout the equipment's lifecycle.