Abstract: a qualified maohan flat, must be strict with each link, each link of the tiny differences, ultimately affects the quality of the products. Maohan flat work surface should not have sand hole, hole, the casting defects such as cracks, slag inclusion and shrinkage. All kinds of casting surface should be clean sand, and the surface level off, the paint is firm.

 

Cast iron platform, the test plate, crossed platform, combined platform, T slot material for: HT200-300. Surface hardness is HB170 ~ 210. After two aging treatment (artificial aging and natural aging 2 ~ 3 years). The accuracy of the product is stable and good abrasion resistance. Cast iron plate, platform is mechanical parts inspection plane, parallel degree, vertical degree, Angle, straightness and shape tolerance measurement benchmark, usually used for testing the laying-out of artifacts, precision parts, milling, processing technology and marking, inspection, measurement, testing, welding, assembly, etc. Accuracy: 0-3; According to national standards JB/T7974-1999; Precision grade according to the national standard metrological verification procedures JJG117-91