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NEWS
Quality Inspection of Cast Iron Platform
Release time:
2020-10-29
1. The working surface of the cast iron platform shall be free of rust, scratches, bruises and other appearance defects affecting the use.
2. There should be no casting defects such as sand holes, pores, cracks, slag inclusion and shrinkage on the working surface. All kinds of casting surface should be cleared of sand, and the surface is smooth, paint firm. The edges shall be blunt. On the flat working surface with accuracy grade lower than "00", the sand hole with diameter less than 15mm is allowed to be blocked with the same material, and its hardness should be lower than that of the surrounding material. In the work surface of the site should not be more than four, the distance between them should not be less than 80mm.
3. Threaded holes or cylindrical holes for installing lifting facilities such as handles and lifting rings shall be provided on the two opposite sides. The lifting position shall be designed to minimize the changes caused by lifting.
4. According to user requirements, after setting threaded holes or grooves on the working surface of the board, these parts should not be raised higher than the working surface.
5, should be made of high-quality gray cast iron or alloy cast iron.
6. The hardness of working face shall be HB 170-220.Cast iron or alloy cast iron manufacturing.
7, the working surface should adopt scraping process, for the "3" level flat working surface can also use planing process, planing the surface roughness of the working surface according to the contour arithmetic average deviation Ra value should not be greater than 5um
8, should be treated with stability and demagnetization.
Flatness: can be divided into laboratory level (Reference), calibration level (Master), tool room level (Working) three
Plane grinding: cast iron platform In the early days, people used three platforms to match each other to produce a true plane. A skilled and patient grindstone master can make many 90-degree rotations without any measuring instruments, but only by matching the three platforms with each other, to produce an unbelievable degree of true flatness.
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