Surface Precision Detection: Use high-precision electronic levels, dial indicators, or laser interferometers to measure along the platform's vertical and horizontal axes and diagonals, recording flatness errors (such as local bulges, depressions, or wavy deviations).
Damage Location: Visually inspect surface scratches, chipped corners, and worn areas. Mark the positions and dimensions of defects to determine if deformation is caused by impact, long-term loading, or environmental changes.
2. Basic Cleaning and Pretreatment
Deep Dust Removal: Wipe the surface with anhydrous ethanol or special granite cleaner to remove oil stains, metal debris, and oxides, preventing impurities from affecting maintenance precision.
Crack Repair (if any): Inject epoxy resin adhesive into fine cracks, fix them with special clamps, and cure to prevent crack expansion; large chipped corners need to be marked for subsequent grinding.
3. Grinding Repair Process
Rough Grinding and Leveling:
Use silicon carbide grinding wheels (80-120 mesh) to grind crosswise along the platform's vertical and horizontal directions, focusing on high-convex areas. Recheck with a level after each grinding pass until the flatness error is reduced to within 0.05mm.
Example: If the platform center bulges by 0.1mm, grind gradually from the center to the periphery to ensure the grinding track covers the entire surface.
Fine Grinding and Polishing:
Replace with 240-600 mesh diamond grinding discs, grind with coolant circulation to eliminate rough grinding marks, and achieve a surface roughness of Ra≤0.8μm.
Finally, polish by hand with grinding paste above 1000 mesh to restore the platform's mirror gloss and improve the flatness of the measuring surface.
4. Precision Calibration and Acceptance
3D Calibration: Use a coordinate measuring machine (CMM) to scan grid points on the entire platform surface (e.g., set a detection point every 500mm×500mm), generate a flatness cloud map, and adjust the error to ≤0.02mm (executed according to GB/T 20428-2006 accuracy grade).
Comparison Verification: Place a standard straightedge on the platform surface and detect gaps with a feeler gauge. For grade 0 platforms, the feeler gauge with a thickness ≤0.005mm should not be insertable.
5. Maintenance and Protection Treatment
Surface Sealing: After wiping dry, spray a nano-level protective agent to form a waterproof and oil-proof film, preventing stains from penetrating into the stone pores (maintenance cycle recommended every 6 months).
Support Optimization: Adjust the platform (support frame) to a horizontal state, use shock-proof foot pads to isolate ground vibrations, and cover with a dust cloth during long-term storage to avoid heavy pressure or sudden temperature changes.
Notes
Control the coolant flow during grinding to prevent micro-deformation of marble due to temperature differences;
Allow the platform to stand for 24 hours after repair to fully release stress before rechecking precision;
For platforms with accuracy requirements higher than grade 0, it is recommended to have them calibrated by a professional metrology institution and issue a certification report.
We continue to focus on the processing and manufacturing of granite mechanical components for more than 10 years, widely used in semiconductor, precision manufacturing, medical equipment, aerospace and other fields, to provide enterprises with high-precision mechanical platforms, equipment bases and gantry structures, for university laboratories, factories, scientific research to provide precision measurement platforms and tools.
We have about 10,000 square meters of standard industrial plant and constant temperature grinding workshop, as well as large cutting machine tools, diamond saw blade cutting machine, CNC drilling machine, gantry carving and milling machine, 6 meters stroke large grinding machine and Japan Mitotoyo measuring tools, with the whole process processing capacity, to provide reliable guarantee for product quality.
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