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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 ............................................... 29
1.1. GENERAL REQUIREMENTS FOR APPEARANCE AND SURFACE ....................................................................................... 29 1.1.1. The burr surface is required to be inside the parts, as shown in Figure 1: ..................................... 29
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. ................................................................................................................................................ 29
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： ................................................................................ 30 Requirements for Riveting Quality .................................................................................................. 32 Exterior Requirements of parts ....................................................................................................... 33
open according to the following hole diameter and rabbet size. ............................................................................. 30 internally curving radius R no larger than t (thickness of materials) and no smaller than 0.2. ............................. 30
1.2. REQUIREMENTS FOR THE BURR OF SHEET-METAL PUNCHING PARTS ........................................................................ 33 1.2.1. Definition of Burr Height： ............................................................................................................ 33
1.2.2. 1.2.3. 1.2.4. 1.2.5.
Classifications of burr areas of structural parts ............................................................................. 34 Requirements for the burr quality of sheet-metal punching parts ................................................... 37 Requirements for the Slag of Sheet-Metal Punching Parts ............................................................. 38 Requirements for Tool Withdrawal Marks on Sheet-Metal Punching Parts ................................... 38
1.3. TOLERANCE REQUIREMENTS OF SHEET-METAL PUNCHING PARTS ............................................................................. 39
1.3.1. Statement ......................................................................................................................................... 39 1、 TOLERANCES IN DRAWINGS, IF SPECIFIED, SHALL ALWAYS PREVAIL. ............................................................................... 39
1.3.2. Tolerance Levels and Values ........................................................................................................... 39
Tolerance levels are classified into f and m. f allows lower tolerances than m. ............................................. 39 1.3.3.
Remarks ........................................................................................................................................... 44
2. INSPECTION RULE ...................................................... 45
2.1. INSPECTION CATEGORY .................................................................................................................................................... 45 2.1.1. General Inspection .......................................................................................................................... 45
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2.1.2. Supplementary Inspection ............................................................................................................... 45
2.2. INSPECTION RULES ........................................................................................................................................................... 45 2.3. INSPECTION PROVISIONS .................................................................................................................................................. 45
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