The difference between marble platform cast iron platform

Cast iron platform marble platform and are measuring and testing the workpiece datum, measuring tools, understand the difference between the two platforms will help us to select the appropriate platform in the industrial production according to their actual use, to avoid unnecessary waste. The following is the difference between marble platform cast iron platform; 1, precision difference: a marble platform 1500mm × 2000mmx300mm from rough stone to the finished product in just a month's time can achieve flatness 3.5μm, place one year after detection platform precision unchanged. The same size cast iron platform to achieve this accuracy is almost impossible, 2, processing differences: marble platform by grinding, polishing is easy to get high surface roughness and precision, unlike the cast iron foundry platform requires complex, forging or heat treatment process, and therefore the processing equipment is simple, short processing cycle, low cost finished products. In the clean surface conditions, wear resistance is 10 times marble platform cast iron platform. 3, ambient temperature difference: marble platform thermal conductivity and thermal expansion coefficient are small, and the thermal conductivity is only general cast iron platform of 1/47, even in the absence of a constant temperature environment can maintain precision marble platform. At room temperature is slowly changing conditions, deformation marble platform produced 1/10 steel, cast iron platform 1/3. This feature is widely used in marble platform an important reason, because the high-precision machining equipment, the deformation caused by temperature lead to reduce the proportion of precision is particularly serious, and the higher the temperature control requirements, using the huge equipment, usually air conditioning and injection shower method, one stops, and second is the high cost, and the marble platform on the temperature is not sensitive to temperature is not critical, it can achieve higher accuracy. 4. Maintenance difference: marble platform does not rust, no seal, nor do they need any anti-rust coating oil, resistant to erosion general acid and alkaline gases and solutions. The surface is scratched or collision, not fresh Gravel most out of it, no glitches, no deformation, it does not affect accuracy. While a smaller portion of available adhesive special rubber projections and achieve precision by milling. This simple process can reduce repair scrapped last step, for shortening the processing cycle, reduce production costs is significant. 5, vibration absorption difference: The marble platform damping 15 times greater than steel, does not transfer vibrations. Vibration is precision machinery and ultra-precision machining of negative factors. Internal damping coefficient, the less likely to cause vibrations in the external force. 6, the physical properties of difference: marble platform non-conductive, anti-magnetic, will not produce sticks and metal or magnetized. 7, the stability difference: marble platform after millions of years of natural aging, stress has long been eliminated, organizational stability, virtually no deformation, long-term stable accuracy. Using 5 to 6 years after the still will not lose precision, by contrast, cast iron platform generally need repair research annually. Based on the above the Complaint: marble platform http://www.btrylj.com main drawback is brittle and can not be anti-oversized bumps and knocks, but its applications are mostly precision and ultra-precision, so it does not show the shortcomings too prominent. Cast iron platform stiffness with ductility, resistance to bumps and knocks, are fitted for industrial production, welding, assembly, welding flat benchmark measuring