The surface processing requirements of granite slabs are strict to ensure their high accuracy, high stability and good performance. The following is a detailed description of the surface processing requirements of granite slabs:
1. Basic requirements
Defect-free surface: There should be no cracks, depressions, loose tissue, wear marks, sickness and other appearance defects that affect the use on the working surface of the granite slab. These defects will directly affect the accuracy and service life of the slab.
Natural streaks and spots: Natural, non-artificial color streaks and spots are allowed on the surface of the granite slab, but these streaks and spots should not affect the overall appearance and performance of the slab.
2. Processing accuracy requirements
Flatness: The flatness of the working surface of the granite slab is a key indicator of processing accuracy. It should meet the corresponding tolerance requirements so that it can maintain good accuracy during measurement and positioning. Flatness detection usually uses high-precision measuring equipment such as interferometers and laser flatness meters.
Surface roughness: The surface roughness of the working surface of the granite slab is also an important processing accuracy indicator. It determines the contact area and friction between the slab and the workpiece, thereby affecting the accuracy and stability of the measurement. The surface roughness should be controlled according to the arithmetic mean deviation Ra value of the profile, which is usually required to reach 0.32~0.63μm, and the arithmetic mean deviation Ra value of the surface roughness profile of the side should be less than 10μm.
III. Processing methods and process requirements
Machine-cut surface: Cut and formed by circular saws, sand saws or bridge cutters, the surface is rough and has obvious machine-cut lines. This method is suitable for occasions where surface precision is not required.
Matt surface: The surface is polished less with resin abrasives, etc. The mirror gloss of the stone is very low, generally less than 10 degrees. This method is suitable for occasions where gloss needs to be determined but is not required.
Polished surface: Highly polished and has a high-gloss mirror effect. This method is suitable for occasions where surface gloss and precision are required.
Other processing methods: such as flamed surface, litchi surface, longan surface, etc. These methods are mainly used for the decoration and beautification of stone, and are not suitable for granite slabs with high precision requirements.
During the processing, the precision and process parameters of the processing equipment, such as grinding speed, grinding pressure, grinding time, etc., should be strictly controlled to ensure that the surface quality that meets the requirements is processed.
IV. Subsequent processing and inspection requirements
Cleaning and drying: After processing, the granite slab should be completely cleaned and dried to remove stains and moisture on the surface to avoid affecting the measurement accuracy and performance.
Protective treatment: In order to improve the weather resistance and service life of the granite slab, it should be protected. Commonly used protective agents include solvent-based protective liquid, water-based protective liquid, etc. Protective treatment should be carried out on a clean and dry surface and strictly follow the product instructions.
Inspection and acceptance: After processing, the granite slab should be fully inspected and accepted. The inspection content includes key indicators such as dimensional accuracy, flatness, and surface roughness. The acceptance should be carried out strictly in accordance with relevant standards and requirements, and the quality of the slab meets the design requirements and usage requirements.
In summary, the requirements for granite slab surface processing involve many aspects, including basic requirements, processing accuracy requirements, processing methods and process requirements, and subsequent processing and inspection requirements. These requirements together constitute the quality determination system for granite slab surface processing, and determine its accuracy and stability in accurate measurement and positioning.