Thin metal film, sheet metal, sheet metal, sheet metal, method, tool, tool (1, 2, 8) and sheet metal component (100), under cold conditions, the prediction and depreciation model of part I (101) operate simultaneously,A mark (103) is engraved on the second part (102) of the metal plate (100). The freezing section (101) is consistent with the forecast and depreciation set and allocated so that the line drawn on the surface of a (100) film between the adjacent lines of the forecast and depreciation is not a straight line. Identification (103) indicates consistency between tool (1, 2, 8) and Lt. / P
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