Granite Precision Inspection Platform —— Introduction to the Core of Constant Temperature and Precision Stability
- Principle of Constant Temperature Stability Core
Utilizing high-density natural Jinan Blue granite, which has undergone billions of years of geological aging to completely release internal stress, resulting in isotropic material uniformity. The coefficient of linear expansion is only 4.5~6×10⁻⁶/℃, far lower than cast iron, steel, and aluminum alloys (only about 1/3 of steel).
Under the standard operating conditions of a constant temperature metrology room at 20±1℃, slight ambient temperature fluctuations, residual heat from workpieces, and equipment heat dissipation will not cause table warping or local deformation. Thermal deformation is controllable at the micron level, and the reference plane accuracy remains drift-free throughout the process, ensuring the consistency of long-term continuous inspection data. - Advantages of Constant Temperature Integration
Uniform deformation across the entire surface
The stone has gentle thermal conductivity, eliminating the local hot and cold differential distortion issues found in metals; even if a slight temperature gradient exists in the constant temperature workshop, the overall expansion and contraction of the table surface are synchronized, keeping the flatness and parallelism reference stable, which significantly reduces the temperature compensation pressure on measuring instruments such as CMMs, height gauges, and calipers.
Long-term dimensional stability
Free from metal aging creep and stress rebound defects, the surface accuracy remains permanently unchanged in a constant temperature environment year-round, eliminating the need for frequent re-grinding and correction of the reference surface on a machine tool.
Synergistic gains when used in constant temperature laboratories
The dual reinforcement of a constant temperature environment and the low thermal expansion characteristics of granite perfectly meets the micron-level inspection requirements of aerospace, precision molds, semiconductors, and medical devices, eliminating dimensional measurement errors caused by temperature fluctuations. - Additional Stability Features (Assisting Constant Temperature Precision)
High damping vibration reduction: The dense crystals rapidly absorb ground vibrations, air compressor noise, and machine tool resonance, preventing the dual error of superimposed vibration and temperature deformation;
Non-magnetic and corrosion-resistant: Cutting fluids and anti-rust oils do not corrode the table surface, and no metal chips adhere to create bumps that interfere with the reference;
High hardness and wear resistance (Shore HS70 ): During long-term constant temperature and high-frequency inspection, the decay of surface accuracy is extremely slow, significantly extending the maintenance cycle.
