Material: cast iron plate using HT200-300 casting, material ingredients ingredients and ingredients according to the following criteria (%): carbon: 3.1-3.4, manganese: 0.6-0.9, silicon: 1.5-2.0, sulfur <0.12, phosphorus < 0.3. Hardness> 180, the second tempering treatment.

Cast iron test platform According to the national standard GB7947-1999 manufacturing. Cast iron platform accuracy grade 0, 1, 2, 3, level and fine plane, cast iron platform made of ribbed plate and box-type, face rectangular, square or round.

First, the thickness requirements : Mainly including platform surface thickness, side thickness and height, as well as the thickness of the bottom plate, height and density.

Second, the material requirements: High-strength cast iron HT200-300, hardness: HB170-240.

Third, artificial annealing: In the tempering kiln after 600-700 degrees high temperature annealing aging treatment.

Four natural aging According to GB standard should be 2 to 3 years of natural aging, due to the process time is too long, the impact of cash flow by the enterprise has been impossible to wait for so long, many of the shaker by vibration aging instead of the effect of this process has not yet clear , But has been widely used in the international arena.

Void and stomata 0 and 1 platforms do not allow holes and trachoma, 2 and 3 can be used with the same solid material filled with trachoma trachoma platform Note: The hardness of the filler must be lower than the hardness of the platform itself.

Scraping process: Artificial shoveling is the most important process in the processing of the cast iron platform. It determines the flatness of the cast iron platform and the number of contacts that can be used on the working surface. The 0 platform is 25 mm square on each side At 25 points; 1 platform on each side of the 25 square square within the range of not less than 20 points; 2 flat platform on each side of the 25 mm square within the range of not less than 16 points; 3 flat platform on each side For the 25 mm square within the range of not less than 12. After the completion of the scraper platform edge four blunt.

Materials are used HT200-300 high row of cast iron hardness of 170-240.

Manufacturing and acceptance standards : Flat panel manufacturing according to national standards GB / T20428-2006, acceptance by JJG117-2005 standards; other requirements are in accordance with the corresponding national standards and industry standards (tender documents should be clearly stated that the standards used, such as the allocation of leveling horn ).

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