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Several special cases of scraping the plate
The standard plate for inspection has a high degree of flatness. In order to ensure the accuracy requirements, the method of manual scraping is still adopted in China. From a technical point of view, some special cases are often encountered in scraping. First, the large flat plate is used as a benchmark to grind a small flat plate with a large flat plate. The conclusion is that the small flat plate is convex. The qualified small flat plate is placed on the qualified large flat plate to show the result. The result is that the small flat plate is empty in the middle, the periphery is hard, and it is obvious. In theory, the two standard planes should show good mutual research, but the actual situation is not good. . The reason is that: