密级：秘密
DKBA
2. 检验规则
2.1. 检验类别
2.1.1. 一般检验
一般检验是指根据设计图样和工艺文件的规定，对钣金冲压件进行的外观检验、尺寸及公差配合检验及常规性能检验。
外观检验是依靠手摸、目测、光照反射、光照投影等方法对钣金冲压件的外观进行检验； 尺寸及公差配合检验是采用工具、夹具、量具，以检验钣金冲压件的尺寸、形状、位置公差； 一般检验可按工艺文件要求或采用标准样件作为对照判定的依据。
2.1.2. 补充检验
补充检验是指一般检验以外的检验。它包括硬度检验、磁性检验、弹性检验、渗透检验、无损探伤检验等。
2.2. 检验原则
钣金冲压件必须进行首件检验、巡回检验和验收检验； 钣金冲压件原则上只进行一般检验；
当设计图样或其它技术文件有具体要求时，应进行补充检验；
批量生产的钣金冲压件，按需要可进行抽检或全检，抽检的方法一般按GB 2828和GB 2829的规 进行；全检一般仅检验主要部分（包括特定的外观要求）。
2.3. 检验规定
冲裁、剪切零件的外形按最大尺寸处进行测量；内孔按最小尺寸处进行测量； 止裂孔直径及工艺槽口尺寸，只在展开料时检查，零件成形后不作检查；
加工后易变形，而在装配时能重新恢复所需几何形状的零件，其尺寸和形状误差，可在装配状态下测量，在自由状态下允许超出极限尺寸。
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1.
Contents
1. TECHNICAL REQUIREMENTS ............................................... 28
1.1. GENERAL REQUIREMENTS FOR APPEARANCE AND SURFACE ....................................................................................... 28 1.1.1. The burr surface is required to be inside the parts, as shown in Figure 1: ..................................... 28
1.1.2.
Blanked and sheared panel parts’ taper angles with outer shapes and inner edges smaller than or
equal to 90° 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
1.1.3. 1.1.4. 1.1.5. 1.1.6. 1.1.7.
If allowable as marked in design documents or drawings, stop holes or technical rabbets can be Parts formed by curving without a curving radius noted on the drawing can be made with an Requirements for flanging-hole with thread： ................................................................................ 29 Requirements for Riveting Quality .................................................................................................. 31 Exterior Requirements of parts ....................................................................................................... 32
open according to the following hole diameter and rabbet size. ............................................................................. 29 internally curving radius R no larger than t (thickness of materials) and no smaller than 0.2. ............................. 29
1.2. REQUIREMENTS FOR THE BURR OF SHEET-METAL PUNCHING PARTS ........................................................................ 32 1.2.1. Definition of Burr Height： ............................................................................................................ 32
1.2.2. 1.2.3. 1.2.4. 1.2.5.
Classifications of burr areas of structural parts ............................................................................. 33 Requirements for the burr quality of sheet-metal punching parts ................................................... 36 Requirements for the Slag of Sheet-Metal Punching Parts ............................................................. 37 Requirements for Tool Withdrawal Marks on Sheet-Metal Punching Parts ................................... 37
1.3. TOLERANCE REQUIREMENTS OF SHEET-METAL PUNCHING PARTS ............................................................................. 38
1.3.1. Statement ......................................................................................................................................... 38 1、 TOLERANCES IN DRAWINGS, IF SPECIFIED, SHALL ALWAYS PREVAIL. ............................................................................... 38
1.3.2. Tolerance Levels and Values ........................................................................................................... 38
Tolerance levels are classified into f and m. f allows lower tolerances than m. ............................................. 38 1.3.3.
Remarks ........................................................................................................................................... 43
2. INSPECTION RULE ...................................................... 44
2.1. INSPECTION CATEGORY .................................................................................................................................................... 44 2.1.1. General Inspection .......................................................................................................................... 44
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2.1.2. Supplementary Inspection ............................................................................................................... 44
2.2. INSPECTION RULES ........................................................................................................................................................... 44 2.3. INSPECTION PROVISIONS .................................................................................................................................................. 44
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2. Figures
Figure 1 Burr of bends ..................................................... 28 Figure 2 Taper angles of panel parts .......................................... 28 Figure 3 Diameter of stop holes .............................................. 29 Figure 4 Technical rabbet................................................... 29 Figure 5 Schematic diagram for flanging-hole with thread ......................... 30 Figure 6 Schematic diagram for flanging-hole with thread for thin sheet connected ..... 31 Figure 7 Riveting procedure................................................. 32 Figure 8 Burr height of sheet-metal structural parts .............................. 32 Figure 9 Identification of Class A and Class B Areas for outdoor cabinets ............ 34 Figure 10 Identification of Class A and Class B Areas for indoor cabinet ............. 35 Figure 11 Identification of Class A and Class B Areas for Subracks ................. 35 Figure 12 Handle bars and panel hardware for Class A and B ...................... 36 Figure 13 Identification of Class A and Class B Areas of Boxes .................... 36 Figure 14 Height of chamfer ................................................ 37
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3. Tables
Table 1 Radius (r) of taper angle ............................................. 28 Table 2 The data of height(H) and Min removable times ........................ 30 Table 3 The data of height(H) and Min removable times for flanging-hole with thread
for thin sheet connected .................................................. 31 Table 4 Riveting parameters ............................................... 31 Table 5 Minimum pulling force borne by riveted points ........................... 32 Table 6 Ultimate value of burr height (Unit: mm) ................................ 37 Table 7 Tolerance levels and values ............................................ 38
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