Large cast iron plate

Features flat iron plate after use and wear, can repair scratch again resume its accuracy. Cast iron plate coloring method available test parts flatness, with accurate, intuitive and convenient advantages. Push on through scraping of cast iron table base plate, the workpiece is relatively smooth, no astringent feeling, to facilitate the measurements, which ensures measurement accuracy. Cast iron plate quality and heat treatment quality of flat performance have a greater impact: or because of residual stress make larger working surface deformation; or because of impatience wear so that the accuracy can not be maintained; or because of lack of small value scraping difficulties roughness. Therefore the use of cast iron plate cast iron materials must be selected, using methods such as aging treatment to eliminate residual stresses of cast iron plate. Cast iron plate is flat reference instrument for part inspection or crossed. More extensive use of cast iron plate, used in machinery manufacturing, chemicals, hardware, aerospace, oil, automobile manufacturing, instrumentation manufacturing and other industries. Cast iron plate: mainly used to test the error of the workpiece datum, inspection plate / test platform machinery manufacturing plays a vital role in the factory before it is tested every piece basic reference tool. According to the structure, cast iron plate into plate and box-style ribs, flat rock into flanged and flangeless type. Their use is divided into inspection plate, crossed plate, assembly plate, welding plate, welded plate, pressure sand flat and so on. Divided according to their level of accuracy, 1,2,3 flat, flat rock can reach 000, of which two or more of inspection plate, three of crossed plates. Test in two ways: with the coloring method test 0 a flat platform on each side of not less than 25 points in the range of 25 mm square. 2 flat platform on each side of not less than 20 points in the range of 25 mm square. 3 flat platform less than 12 points in each side of 25 mm square range. Flatness Flatness test formula :( by JB / T7975-1999 Standard) 000: 1 × (1 + d / 1000) μm 0 0 级: 2 × (1 + d / 1000) μm 0 级: 4 × ( 1 + d / 1000) μm 级 1: 8 × (1 + d / 1000) μm 级 2: 16 × (1 + d / 1000) μm 级 3: 40 × (1 + d / 1000) μm (d for the moldings mm) (measured temperature at 20 ± 2 ℃) technical requirements, flat working surface may not have sand holes seriously affect the appearance and performance of pores, cracks, slag, shrinkage, scratches, bumps, embroidered point and other defects. 2, the casting surface of the plate should be clear and smooth sand, paint firm. 3, precision grade 0 flat work surface - level 3, the hole diameter of less than 15mm of sand allows the same material clogging hardness less than the hardness of the surrounding material. Face clogged sand hole should be limited to four, and the distance between the holes of sand should not be less than 80mm. 4, the plate should be used to create high-quality fine gray cast iron and other materials, its face hardness should be 170 ~ 220HB. 5, flat working surface usually scraping process. Scraping for use of three flat working surface, the surface roughness Ra maximum allowable value 5μm. 6, the plate should demagnetization and stability of the treatment. 7, relatively flat on both sides, should install the device handle or rings threaded holes (or cylindrical holes), device location and design should minimize the distortion caused because of transportation. 8, if the flat work surface set screw hole (or trench), which parts should be no higher than the working surface. Specifications Accuracy class specification accuracy grade 0 1 2 3 0 1 fine plane two three fine plane 100 × 100 4 8 26 2500 × 2500 72 180 270 200 × 100 5 10 20 3000 × 1000 168 248 200 × 200 5 10 20 3000 × 1500 174 154 300 × 200 6 12 24 3000 × 2000 184 275 300 × 300 6 12 24 3000 × 2500 186 276 400 × 300 6 12 24 3000 × 3000 210 300 400 × 400 6 12 24 4000 × 1000 210 300 500 × 300 6 12 24 4000 × 1500 210 300 500 × 500 7 14 28 4000 × 2000 219 310 600 × 400 7 14 28 4000 × 2500 228 340 600 × 500 7 14 28 4000 × 3000 240 360 800 × 500 8 16 32 80 5000 × 1500 249 370 800 × 600 8 16 32 80 5000 × 2000 255 375 900 × 600 8 16 32 80 5000 × 2500 264 390 1000 × 750 9 18 36 90 5000 × 3000 287 420 1000 × 1000 10 20 39 96 6000 × 1500 287 420 1200 × 1000 20 39 96 6000 × 2000 293 430 1500 × 1000 24 48 120 6000 × 2500 300 450 1500 × 1500 25 50 125 6000 × 3000 308 460 2000 × 1000 26 52 129 8000 × 1500 366 500 2000 × 1500 56 140 8000 × 2000 370 520 2000 × 2000 60 152 230 8000 × 2500 375 530 2500 × 1500 64 152 230 8000 × 3000 382 570 2500 × 2000 68 168 248