Marble inspection plate

A marble platform accuracy reference standard of advanced countries, flatness tolerance according to: GB4987-85 Standard: 000 = 1 × (1 + d / 1000) um 00 级 = 2 × (1 + d / 1000) um 0 级 = 4 × (1 + d / 1000) um 级 1 = 8 × (1 + d / 1000) um (d diagonal mm) (measured temperature is generally 20 ± 2 ℃ marble slab physical properties: marble slab gravity: 2970-3070kg / m, compressive strength: 245-254N / m ㎡ linear expansion coefficient: 4.61 × 10-6 / ℃, water absorption: <0.13%, Shore hardness: Hs70 form above marble marble platform based on the quality of the rock underground layer, after millions of years of natural aging, form extremely stable, do not worry because the conventional temperature and deformation. The rigorous physical testing and selection of granite materials, fine crystalline, hard, compressive strength of 2290-3750 kg / sq. cm, hardness of Ta Mok's hardness 6-7. Extremely resistant to abrasion, acid and alkali, high corrosion resistance, never rust. Because marble based nonmetallic material, no magnetic response, no plastic deformation hardness 2-3 times higher than cast iron (equivalent to HRC> 51), and therefore to maintain good accuracy. Even rock tools in use by heavy bump, up out of fresh ballast only, and not as metal tools, as a result of deformation and destruction of accuracy. The superior quality cast iron and steel production base parts precision measurement, to obtain high and stable accuracy. marble platform marble platform advantages of using high-quality natural marble material by machining, manual refinements . made of black gloss, structural precision even texture, good stability and high strength, high stiffness and has: no rust acid, non-magnetized, the same type, wear resistance and good energy in heavy duty and general. stable temperature. precision reference measurement tools marble platform is made of natural stone material, for instruments, precision tools, machinery parts of the test, is an ideal base, especially for high-precision measurement , due to its unique characteristics, leaving the cast iron plate dwarfs granite slab, precision granite slab, granite inspection plate, instrument platform, using high-quality "Jinan Green" stone grinding by machining and hand-made Black gloss, structural precision, even texture, good stability, high strength, high hardness, high accuracy can be maintained under heavy duty and general temperature, and has no rust, acid, wear resistance, is not magnetized, not variations etc .. granite slab for machinery factory measurement tools. Features Marble platform accuracy and ordinary dimensions (mm) Accuracy class 000 00 flatness flatness 0 flatness a marble platform flatness is What marble platform mainly accuracy and stability, easy maintenance because: ① marble platform structure dense, smooth surface wear-resistant, low roughness value; ② marble through a long-term natural aging, internal stress completely disappeared, material stability, no. will be deformed; ③ acid, alkali, corrosion resistance, anti-magnetic; ④ not damp rust, use, easy maintenance; ⑤ linear expansion coefficient, little effect by temperature; ⑥ Face by collision or scratch, the only generating pits, no ridges, burrs, no effect on the measurement accuracy. Flat Rock main disadvantage is that not to put too much impact, beat, high humidity may be deformed, moisture absorption of 1%. Flatness and proportion marble platform flatness tolerance according to: GB4987-85 Standard: 000 = 1 × (1 + d / 1000) um00 level = 2 × (1 + d / 1000) um 0 级 = 4 × (1+ d / 1000) um1 level = 8 × (1 + d / 1000) um (d diagonal mm) (measured temperature is generally 20 ± 2 ℃ marble slab gravity: 2970-3070kg / m Compressive strength: 245-254N / m linear expansion coefficient: 4.61 × 10-6 / ℃, water absorption: <0.13% Shore hardness: Hs70 Edit this paragraph marble platform above the main mineral component materials Summary The principal mineral ingredients pyroxene, plagioclase, minor olivine , biotite and traces of magnetite, black color, structural precision, after millions of years of aging, even texture, good stability, high strength, high hardness, high accuracy can be maintained under heavy load. suitable for industrial production and laboratory room measurements. etc. granite-based non-metallic materials, no magnetic response, no plastic deformation, especially for high-precision measurement, industrial measurement granite slab is an indispensable instrument. granite slab is to use precision reference measurement tools made of natural stone materials, for instruments, precision tools, machinery parts of the test, is an ideal base. stone after millions of years of natural aging, form extremely stable, do not worry because conventional The temperature and deformation granite platform is not magnetization measurements can move smoothly, without Zhise sense, not damp the impact, the plane stable good granite measuring physical properties: granite slab proportion: 2970 ~ 3070kg / m, compressive strength: 245 ~ 254N / m ㎡, strong ground-amount: 1.27 ~ 1.47N / m ㎡ linear expansion coefficient: 4.6 × 10 ~ 6 ℃, water absorption: 0.13%, Shore strength: HS70 above.