【正文】 Installation holes of connectors。 which are not noted on the drawing should be made as fillets (as shown in 0) with a radius (r) specified as Table 1.T a p e r a n g l eT a p e r a n g l eFigure 2 Taper angles of panel partsTable 1 Radius (r) of taper angleThickness (t) of materials ≤ ~ ~1 1~2 2~3 3Radius (r) of taper angle ≤ 1 . If allowable as marked in design documents or drawings, stop holes or technical rabbets can be open according to the following hole diameter and rabbet size. d, diameter of stop holes (as shown in 0), should be smaller than or equal to 2 t。 which are not noted on the drawing should be made as fillets (as shown in Figure 2) with a radius (r) specified as Table 1. .................................................................................................................................................28. If allowable as marked in design documents or drawings, stop holes or technical rabbets can be open according to the following hole diameter and rabbet size...............................................................................29. Parts formed by curving without a curving radius noted on the drawing can be made with an internally curving radius R no larger than t (thickness of materials) and no smaller than . ..............................29. Requirements for flanginghole with thread： .................................................................................29. Requirements for Riveting Quality ...................................................................................................31. Exterior Requirements of parts.........................................................................................................32. REQUIREMENTS FOR THE BURR OF SHEETMETAL PUNCHING PARTS .........................................................................32. Definition of Burr Height： ..............................................................................................................32. Classifications of burr areas of structural parts ..............................................................................33. Requirements for the burr quality of sheetmetal punching parts....................................................36. Requirements for the Slag of SheetMetal Punching Parts ..............................................................37. Requirements for Tool Withdrawal Marks on SheetMetal Punching Parts....................................37. TOLERANCE REQUIREMENTS OF SHEETMETAL PUNCHING PARTS..............................................................................38. Statement...........................................................................................................................................38 TOLERANCES IN DRAWINGS, IF SPECIFIED, SHALL ALWAYS PREVAIL. ................................................................................38. Tolerance Levels and Values ............................................................................................................38Tolerance levels are classified into f and m. f allows lower tolerances than m...............................................38. Remarks ............................................................................................................................................432. INSPECTION RULE........................................................44. INSPECTION CATEGORY .....................................................................................................................................................44. General Inspection............................................................................................................................44. Supplementary Inspection.................................................................................................................44. INSPECTION RULES.............................................................................................................................................................44. INSPECTION PROVISIONS ....................................................................................................................................................442. FiguresFigure 1 Burr of bends......................................................28Figure 2 Taper angles of panel parts ...........................................28Figure 3 Diameter of stop holes ..............................................29Figure 4 Technical rabbet ...................................................29Figure 5 Schematic diagram for flanginghole with thread .........................30Figure 6 Schematic diagram for flanginghole with thread for thin sheet connected......31Figure 7 Riveting procedure .................................................32Figure 8 Burr height of sheetmetal structural parts ...............................32Figure 9 Identification of Class A and Class B Areas for outdoor cabis .............34Figure 10 Identification of Class A and Class B Areas for indoor cabi..............35Figure 11 Identification of Class A and Class B Areas for Subracks ..................35Figure 12 Handle bars and panel hardware for Class A and B .......................36Figure 13 Identification of Class A and Class B Areas of Boxes .....................36Figure 14 Height of chamfer.................................................373. TablesTable 1 Radius (r) of taper angle..............................................28Table 2 The data of height(H) and Min removable times .........................30Table 3 The data of height(H) and Min removable times for flanginghole with thread for thin sheet connected .....................................................31Table 4 Riveting parameters................................................31Table 5 Minimum pulling force borne by riveted points............................32Table 6 Ultimate value of burr height (Unit: mm) .............................