某技术有限公司钣金冲压件质量要求内容

1、 1 / 44DKBA华为技术部技术规华为技术部技术规DKBA0.450.0040 REV C钣金冲压件质量要求钣金冲压件质量要求SpecificationSpecification ForFor Sheet-metalSheet-metal PunchingPunching PartPart2012年07月30日发布 20012年09月1日实施华为技术Huawei Technologies Co., Ltd.所有 侵权必究 2 / 44All rights reserved修订声明Revision declaration本规拟制与解释部门：整机工程部基础平台部本规的相关系列规或文件:无相关国

2、际规或文件一致性：无替代或作废的其它规或文件：无相关规或文件的相互关系：无规号规号主要起草主要起草部门专家部门专家主要评审部门专家主要评审部门专家修订情况修订情况DKBA0.450.0040 REV C基础平台部：建军（00118387）肖春秀(00053994)整机工程部：郭天次（0014571）许志敏（00114402），黄涛（00121968）实（00118600），钟宏辉（00121959），润孝（00049797）MQE:亮（00068994）SQE:王进（00151357）1、增加了自铆质量要求；2、刷新了钣金件公差要求。DKBA0.450.0040 REV B质量成本管理部：肖春

3、秀53994整机工程部:周伟 00123276,玲 00119690俊周 00123308,华 00102167曦晨 00152131,和永超 57041MQE：曾松来00125372TQC：马宝兴39736CEG：连东 001149491、将外观表面的定义引用于DKBA0.400.00212、增加了翻边攻丝的质量要求；DKBA0.450.0040 REV1.0质量成本管理部：肖春秀53994质量成本管理部：盛辉21628、周伟16271结构平台开发部：玲15593MQE：军17658TQC：马宝兴39736新归档 3 / 44目目 录录 1.1.技术要求技术要求6 61.1.1.1. 外观与

4、表面状态一般要求外观与表面状态一般要求61.1.1. 零件的毛刺面朝向要求61.1.2. 冲裁类平板零件圆角要求61.1.3. 零件上止裂孔、工艺槽要求71.1.4. 弯曲零件未注圆角R要求71.1.5. 翻边攻丝质量要求81.1.6. 自铆质量要求91.1.7. 零件表面的外观要求101.2.1.2. 钣金冲压件毛刺的要求钣金冲压件毛刺的要求101.2.1. 毛刺的高度定义101.2.2. 结构件的毛刺区域分类101.2.3. 钣金冲压件毛刺质量要求141.2.4. 钣金冲压件的熔渣要求151.2.5. 钣金冲压件的接刀痕的要求151.3.1.3. 钣金冲压件公差要求钣金冲压件公差要求151

5、.3.1. 公差要求151.3.2. 钣金件冲压公差等级代号与数值161.3.3. 其它说明202.2.检验规则检验规则21212.1.2.1. 检验类别检验类别212.1.1. 一般检验212.1.2. 补充检验212.2.2.2. 检验原则检验原则212.3.2.3. 检验规定检验规定21图目录图目录图 1 折弯件毛刺方向示意图6图 2 平板件的尖角示意图6图 3 止裂孔直径示意图7 4 / 44图 4 工艺槽口示意图7图 5 翻边攻丝示意图8图 6 薄板连接用带锥台翻边攻丝孔结构示意图8图 7 自铆连接示意图9图 8 钣金件毛刺示意图10图 9 户外机柜类A、B类区域判断示意图12图 1

6、0 室机柜类A、B类区域判断示意图13图 11 插箱类A、B类区域判断示意图13图 12 拉手条与面板等小五金类A、B类区域判断示意图14图 13 盒式类A、B类区域判断示意图14图 14 倒角高度示意图15表目录表目录表 1 平板件圆角半径r r值6表 2 普通翻边高度H值和螺纹最少反复打入次数8表 3 薄板连接用带锥台翻边攻丝孔翻边高度H值和螺纹最少反复打入次数9表 4 自铆参数表9表 5 自铆连接点最小承力表9表 6 毛刺高度的极限值15表 7 钣金公差数值表16 5 / 44钣金冲压件质量要求钣金冲压件质量要求Specification For Sheet-metal Punching

7、 Part 围围Scope:Scope:本规规定了华为的钣金冲压件（表面处理前）的质量要求、检验规则。本规适用于华为所有的钣金冲压件（表面处理前），设计图中有注明的要求以设计图为准，图中未注明的按此规为准。简介简介BriefBrief introductionintroduction：规定了钣金冲压件(零件级)的质量要求与检验规则。关键词关键词KeyKey wordswords：外观、表面状态、工艺槽口、圆角半径、A类区域、B类区域、毛刺、毛刺高度华为技术文件优先级说明：华为技术文件优先级说明：华为产品生产执行的技术文件有：华为图纸、华为企业标准规、通信设备行业标准、中国国家标准、国际标准。这

8、些标准的优先级别从高到低依次为：华为图纸-华为企业标准规-通信设备行业标准-中国国家标准-国际标准。如果各级文件之间有不一致的地方，应按最高级别的文件执行。在华为企业标准规中，产品专用标准优先于通用技术标准。术语和定义术语和定义Term&DefinitionTerm&Definition：缩略语缩略语AbbreviationsAbbreviations 英文全名英文全名 FullFull spellingspelling中文解释中文解释 ChineseChinese explanationexplanationA类区域Class A Area在钣金供应商交货时，产品在正常工作位

9、置手能触膜到的边角区域；以与设计图中特别要求的部位。B类区域Class B Area不属于A类的区域都为B类区域毛刺Burr指板料冲裁后留在冲裁件断面边缘锋利的凸起，毛刺高度Height Of Burr指板料冲裁后留在冲裁件断面边缘锋利的凸起的高度毛刺面Surface of Burr指边缘有毛刺的冲裁件平面。对于落料，毛刺面是接触凸模的平面；对于冲孔，毛刺面是接触凹模的平面。1级表面Class 1 Surface重要外观表面，体现产品外观形象，具有装饰性，可以直接正视到的主要外观表面。主要包括机柜、插框（包括一体化机箱和数通机箱）、无线射频模块、盒式结构、拉手条等的正面和正面上主要零部件的外表

10、面、机柜前 6 / 44缩略语缩略语AbbreviationsAbbreviations 英文全名英文全名 FullFull spellingspelling中文解释中文解释 ChineseChinese explanationexplanation门开门后的正视面、高度小于、等于1.8米的机柜顶面（如Hert中机柜顶面）等。2级表面Class 2Surface主要外表面，半装饰性的经常可见的外观表面。主要包括机柜方孔条正面、机柜外部侧面、机柜后面、插框（包括一体化机箱和数通机箱）、无线射频模块的外部侧面和后面与防护网等处经常被打开的可视面等。小五金件、机柜机箱附件等均定义为2级表面。3级表面

11、Class 3Surface次要外表面和表面，不是以装饰为目的，表面质量要求不高的结构表面。主要包括机柜、插框（包括一体化机箱和数通机箱）、无线射频模块、盒式结构、拉手条等的表面和底面、高度大于1.8米的机柜顶面以与安装支架、绑线架、部框架、部焊件的所有表面等。除1、2级表面外的表面均为3级表面。1.1.技术要求技术要求1.1.1.1. 外观与表面状态一般要求外观与表面状态一般要求1.1.1. 零件的毛刺面朝向要求毛刺面朝向零件里面，如图1：图 1 折弯件毛刺方向示意图特殊情况：按编码级分析零件之间的装配关系，零件的毛刺面应在里面或非功能面；如“L”型的零件为滑道，则毛刺面应在零件的外面，与上

12、图相反。1.1.2. 冲裁类平板零件圆角要求图样上未注明的外形和缘小于或等于90的尖角处应制成圆角（见Error!Error! ReferenceReference sourcesource notnot found.found.），其圆角半径r按0规定。 7 / 44图 2 平板件的尖角示意图表 1 平板件圆角半径r r值材料厚度 t 0.30.30.50.5112233圆角半径r0.20.30.511.50.5t1.1.3. 零件上止裂孔、工艺槽要求当设计文件或图样上注明允许开止裂孔或工艺槽口时，其止裂孔直径和工艺槽口尺寸，按下列要求选择：1、止裂孔直径d（见图3）不大于2t；图 3 止裂

13、孔直径示意图2、工艺槽口尺寸L和b（见04）；当t0.5mm时，1mmb1.5 t （如1.5t1，则b=1）；当t0.5mm时，b=1mm。Lt+r+0.5b 8 / 44图 4 工艺槽口示意图1.1.4. 弯曲零件未注圆角R要求当图样上未注明弯曲半径时，允许按弯曲半径R不大于t（t为材料厚）且最小值为0.2。1.1.5. 翻边攻丝质量要求1、普通翻边高度H值和螺纹寿命满足以下要求：图 5 翻边攻丝示意图表 2 普通翻边高度H值和螺纹最少反复打入次数螺纹规格板厚T翻边高度H（公差+0.30）圆角R最大值最少反复打入次数0.81.8121.02301.22.230M31.52.4301.02.

14、4301.22.630M41.5330M51.22.40.330 9 / 441.52.7302、 薄板连接用的带锥台翻边攻丝该翻边攻丝孔用于薄板连接的场景，实现M3国标沉头螺钉在0.8、1.0mm板材上不凸出板面,使翻边高度H值和螺纹寿命满足以下要求图 6 薄板连接用带锥台翻边攻丝孔结构示意图表 3 薄板连接用带锥台翻边攻丝孔翻边高度H值和螺纹最少反复打入次数螺纹规格材料板厚 T翻边后底孔径D1(参考)翻边高度 H（公差+0.20）沉头孔大径D3 (公差0.1)最少反复打入次数1000636316016040040010001000圆孔直径0.100.150.20-0.150.200.30-

15、孔间距0.100.150.200.250.300.150.200.300.400.50孔边距0.100.150.200.250.300.150.200.300.400.50直边距0.100.150.200.250.300.150.200.300.400.50冲裁角度冲裁特征030030030-1.0030030-f 级(精密精度)m级(中等精度)特征分类尺寸分类特征示意图636316016040040010001000636316016040040010001000孔到折弯边距离(1 次折弯)0.150.200.200.250.300.200.300.500.500.50直边到折弯边距离(1

16、次折弯)0.150.200.200.250.300.200.300.500.500.50孔间距0.200.250.250.300.40(2 次折弯)0.250.300.500.500.75成型特征折弯边到折弯边距离0.150.200.200.250.300.250.300.500.500.75 17 / 44(2 次折弯)直边到折弯边距离(3 次折弯)0.200.250.250.300.400.300.400.500.751.00折弯边到折弯边距离(4 次折弯)0.250.300.300.400.500.300.400.500.751.00孔间距0.200.250.250.300.40(4 次

17、折弯)0.300.400.500.751.00f 级(精密精度)m级(中等精度)特征分类尺寸分类特征示意图636316016040040010001000636316016040040010001000直边到直边距离(4 次折弯)0.200.250.250.300.400.300.400.500.751.00局部成型1010252563-1010252563-形状尺寸0.150.200.30-0.200.300.50-局部成型位置尺寸0.150.200.200.250.300.200.300.500.751.00压死边长度0.15-0.30-压死边厚度0.20.3成型特征(无间隙)0-0- 1

18、8 / 44压死边厚度(有间隙)0.20-0.30-折弯角度0.50.50.50.50.51.01.01.01.01.0f 级(精密精度)m级(中等精度)特征分类尺寸分类特征示意图636316016040040010001000636316016040040010001000喷涂保护尺寸1.01.51.51.52.01.01.51.51.52.0丝印尺寸0.50.50.50.5-0.50.50.50.5-平面度(平面少量冲裁特征)0.30.50.81.530.50.81.535平面度其它特征(平面有成形、焊缝或密孔等特征)0.50.81.5350.81.5357说明：上表适用于厚度不大于1.5

19、mm板材，大于1.5mm厚度的板材其公差可酌情相应增加30%左右；上表适用于冷轧板、镀锌板等常用板材，弹簧板等板材其公差可酌情相应增加；冲密孔（通风孔）尺寸公差可参照相应冲裁尺寸公差放大；压印、压字、加强筋、线桥、凸台、敲落孔、百叶窗等特征公差均可参照局部成形公差值；压铆螺母/螺柱/螺钉等位置尺寸公差值在其底孔的位置尺寸公差值基础上加0.05；注示为的冲裁角度、折弯角度的尺寸分段分别指相应特征冲裁短边尺寸、折弯短边尺寸数值分段； 19 / 44注示为的公差数值根据工序调整（先折弯后冲孔）可按冲裁孔间距标注公差；注示为的平面度尺寸分段指平面最大对角线长度尺寸分段；直线度公差值可参照上表中的平面度

20、公差值执行；对于多于4折的折弯特征，其累积公差按每折加0.05的精度来处理；对于多于4折的折弯特征，可以提高其中某一折的尺寸精度，提高的精度值可参照1次折弯精度；对于上表中未列出的特征，其尺寸公差可参照相似/相近的特征公差来处理；1.3.3. 其它说明钣金件尺寸与公差要指钣金件成品尺寸与公差，即表面处理（钝化、氧化、电镀、喷涂等）后的尺寸与公差； 20 / 442.2.检验检验规则规则2.1.2.1. 检验类别检验类别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、尺寸与公差配合检验与常规性能检验。外观检验是依靠手摸、目测、光照反射、光照投影等方法对

21、钣金冲压件的外观进行检验；尺寸与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。2.2.2.2. 检验原则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

22、.3.2.3. 检验规定检验规定冲裁、剪切零件的外形按最大尺寸处进行测量；孔按最小尺寸处进行测量；止裂孔直径与工艺槽口尺寸，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。 1.1.C Contentsontents1.TECHNICAL1.TECHNICAL REQUIREMENTSREQUIREMENTS28281.1.G GENERALENERAL R REQUIREMENTSEQUIREMENTS FORFOR A APPEARANCEPPEARANCE ANDAND S S

23、URFACEURFACE281.1.1.The burr surface is required to be inside the parts, as shown in Figure 1:281.1.2.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

24、radius (r) specified as Table 1.281.1.3.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.291.1.4.Parts formed by curving without a curving radius noted on the drawing can be made with an inter

25、nally curving radius R no larger than t (thickness of materials) and no smaller than 0.2.291.1.5.Requirements for flanging-hole with thread：291.1.6.Requirements for Riveting Quality311.1.7.Exterior Requirements of parts321.2.R REQUIREMENTSEQUIREMENTS FORFOR THETHE B BURRURR OFOF S SHEETHEET-M-METALE

26、TAL P PUNCHINGUNCHING P PARTSARTS321.2.1.Definition of Burr Height：321.2.2.Classifications of burr areas of structural parts331.2.3.Requirements for the burr quality of sheet-metal punching parts361.2.4.Requirements for the Slag of Sheet-Metal Punching Parts371.2.5.Requirements for Tool Withdrawal M

27、arks on Sheet-Metal Punching Parts371.3.T TOLERANCEOLERANCE R REQUIREMENTSEQUIREMENTS OFOF S SHEETHEET- -METALMETAL P PUNCHINGUNCHING P PARTSARTS381.3.1.Statement381、TOLERANCES IN DRAWINGS, IF SPECIFIED, SHALL ALWAYS PREVAIL.381.3.2.Tolerance Levels and Values38Tolerance levels are classified into f

28、 and m. f allows lower tolerances than m.381.3.3.Remarks43 22 / 442.INSPECTION2.INSPECTION RULERULE44442.1.INSPECTION CATEGORY442.1.1.General Inspection442.1.2.Supplementary Inspection442.2.INSPECTION RULES442.3.INSPECTION PROVISIONS44 2.2.FiguresFiguresFigureFigure 1 1 Burr of bends28FigureFigure 2

29、 2 Taper angles of panel parts28FigureFigure 3 3 Diameter of stop holes29FigureFigure 4 4 Technical rabbet29FigureFigure 5 5 Schematic diagram for flanging-hole with thread30FigureFigure 6 6 Schematic diagram for flanging-hole with thread for thin sheet connected31FigureFigure 7 7 Riveting procedure

30、32FigureFigure 8 8 Burr height of sheet-metal structural parts32FigureFigure 9 9 Identification of Class A and Class B Areas for outdoor cabinets34FigureFigure 1010 Identification of Class A and Class B Areas for indoor cabinet35FigureFigure 1111 Identification of Class A and Class B Areas for Subra

31、cks35FigureFigure 1212 Handle bars and panel hardware for Class A and B36FigureFigure 1313 Identification of Class A and Class B Areas of Boxes36FigureFigure 1414 Height of chamfer37 3.3.TablesTablesTableTable 1 1 Radius (r) of taper angle28TableTable 2 2 The data of height(H) and Min removable time

32、s30TableTable 3 3 The data of height(H) and Min removable times for flanging-hole with thread for thin sheet connected31TableTable 4 4 Riveting parameters31TableTable 5 5 Minimum pulling force borne by riveted points32TableTable 6 6 Ultimate value of burr height (Unit: mm)37T Ta ab bl le e 7 7 Toler

33、ance levels and values38 25 / 44Specifications for Sheet-metal Punching PartsScopeScopeThis specification covers the general quality requirements and inspection rules for Huawei sheet-metal punching parts (before surface treatment).This specification applies to Huaweis all sheet-metal punching parts

34、 (before surface treatment). Reference is given to the design drawings with noted requirement and to this specification if not noted in the design drawing.BriefBrief IntroductionIntroductionThis specification provides the general quality requirements and inspection rules for sheet-metal punching par

35、ts.KeywordsKeywordsAppearance, surface status, technical rabbet, fillet radius, class A area, class B area, burr, and burr height.RevisionRevision DeclarationDeclarationStatement on the Priority of Huawei Technical DocumentsHuawei products are manufactured based on the following documents which are

36、listed in order of priority: Huawei drawings, Huawei enterprise technical standards, telecommunications industry standards, China national standards, and international standards.Shall there be discrepancy between these documents, the document of the highest priority takes precedence.Among Huawei ent

37、erprise technical standards, specific product standards have higher priorities than general standards.TermTerm & & DefinitionDefinitionFullFull SpellingSpellingChineseChinese ExplanationExplanationClass A AreaCorner areas touchable by hands in the normal working position of products when del

38、ivered by sheet-metal suppliers; and areas specially required in design drawings.Class B AreaAreas except for Class A AreaBurrBurr on the cross section of finished products when blanking sheet metalHeight Of BurrBurr height on the cross section of finished products when blanking sheet metal 26 / 44F

39、ullFull SpellingSpellingChineseChinese ExplanationExplanationLevel 1 SurfaceCritical surface represents the product appearance. Through this kind of decorative surface, you can directly see the major product appearance, including the outer surface of the front and of the main parts installed on the

40、front of the cabinet, subrack (involving the integrated chassis and data communications chassis), radio frequency module, box, handle bar, and the surface that you can directly see after opening the front door of the cabinet.Level 2SurfaceMajor outer surface is half-decorative and is commonly seen,

41、including the front of the mount bar on the cabinet, sides outside the cabinet, rear of the cabinet, sides outside and at rear of the subrack (involving the integrated chassis and data communications chassis) and radio frequency module, and topside of the cabinet that is lower than 1.8 m. Surfaces o

42、f the ironware and accessories of the cabinet and chassis are all defined as level 2 surfaces.Level 3SurfaceMinor outer surface and inner surface. These surfaces are not decoration-oriented and not demanding on the surface quality, including the inner surface and underside of the cabinet, subrack (i

43、nvolving the integrated chassis and data communications chassis), radio frequency module, box, and handle bar, topside of the cabinet that is higher than 1.8m, and all surfaces of the installing support, bundling rack, inner frame, and inner solder. Surfaces that not belong to level 1 and level 2 su

44、rfaces are level 3 surfaces. 27 / 441.1. TechnicalTechnical RequirementsRequirements1.1.1.1. GeneralGeneral RequirementsRequirements forfor AppearanceAppearance andand SurfaceSurface1.1.1. The burr surface is required to be inside the parts, as shown in Error!Error! ReferenceReference sourcesource n

45、otnot found.found.:FigureFigure 1 1Burr of bendsExceptions: the burr surface is the inner surface or non-functional surface of parts if the assembling relationship between parts is analyzed based on the coding level; the burr surface is the outer surface of parts if L-shaped parts are slideways, and

46、 opposite to the above diagram.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 0) with a radius (r) specified as Table 1.Taper angleTaper angleFigureFigure 2 2T

47、aper angles of panel parts 28 / 44TableTable 1 1Radius (r) of taper angleThickness (t) of materials 0.30.30.50.5112233Radius (r) of taper angle 0.20.30.511.50.5t1.1.3. If allowable as marked in design documents or drawings, stop holes or technical rabbets can be open according to the following hole

48、diameter andrabbet size.1、d, diameter of stop holes (as shown in 0), should be smaller than or equal to 2 t;FigureFigure 3 3Diameter of stop holes2、L and b, sizes of technical rabbets (as shown in 0);When t 0.5 mm, 1 mm b 1.5 t (if 1.5 t 1, b = 1)When t 0.5 mm, b = 1 mm.L t + r+0.5bFigureFigure 4 4T

49、echnical rabbet 29 / 441.1.4. 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 0.2.1.1.5. Requirements forflanging-hole with thread：1、Requirementsfor height(H) and Min r

50、emovable times of flanging (as shown in 05)FigureFigure 5 5Schematicdiagram forflanging-hole with threadTableTable 2 2The data of height(H) and Min removable timesThreadPlate thickness(T)Inner diameter of flanging-hole(D1)High of flanging-hole(H)(Tolerance 0+0.3)Max. RMin removable times(Time)0.81.8

51、121.02301.22.230M31.52.52.4301.02.4301.22.630M41.53.33301.22.430M51.54.22.70.330 30 / 442、 Flanging-hole with threadfor thin sheet connectedThe flanging-hole is used in thin sheet connected, to achieve that standard countersunk head screwM3 could be sunk into the plate surface with thickness 0.8mm o

52、r 1.0 mm. Requirementsfor height(H) and Min removable times of flanging (as shown in 06).FigureFigure 6 6Schematicdiagram forflanging-hole with threadfor thin sheet connectedTableTable 3 3The data of height(H) and Min removable timesforflanging-hole with threadfor thin sheet connectedThreadMaterialP

53、late thickness(T)Inner diameter of flanging-hole D1(Reference)High of flanging-hole(H)(Tolerance 0+0.2)Outer diameter of flanging-hole D3 (Tolerance0.1)Min removable times(Time)10001000636363631601601601604004004004001000100010001000Hole diameter0.100.150.20N/AN/A0.150.200.30N/AN/ADistance between t

54、wo holes0.100.150.200.250.300.150.200.300.400.50Distance between a hole and an edge0.100.150.200.250.300.150.200.300.400.50BlankingDistance between a line 0.100.150.200.250.300.150.200.300.400.50 39 / 44and an edgeBlanking angle 030030030N/AN/A1.0030030N/AN/ALevelLevel f f (High(High Precision)Preci

55、sion)LevelLevel m m (Average(Average Precision)Precision)CharacteristCharacteristicicDiameter,Diameter, Distance,Distance, oror AngleAnglePicturePicture636363631601601601604004004004001000100010001000636363631601601601604004004004001000100010001000Distance between a hole and a bent flange(one bend)0

56、.150.200.200.250.300.200.300.500.500.50Distance between a bent flange and a flat edge(one bend)0.150.200.200.250.300.200.300.500.500.50Distance between two holes0.200.250.250.300.40(two bends)0.250.300.500.500.75FormingDistance between two 0.150.200.200.250.300.250.300.500.500.75 40 / 44Characterist

57、CharacteristicicDiameter,Diameter, Distance,Distance, oror AngleAnglePicturePictureLevelLevel f f (High(High Precision)Precision)LevelLevel m m (Average(Average Precision)Precision)636363631601601601604004004004001000100010001000636363631601601601604004004004001000100010001000bent flanges(two bends)

58、Distance between a flat edge and a bent flange(three bends)0.200.250.250.300.400.300.400.500.751.00Distance between two bent flanges(four bends)0.250.300.300.400.500.300.400.500.751.00Distance between two holes0.200.250.250.300.40(four bends)0.300.400.500.751.00 41 / 44LevelLevel f f (High(High Prec

59、ision)Precision)LevelLevel m m (Average(Average Precision)Precision)CharacteristCharacteristicicDiameter,Diameter, Distance,Distance, oror AngleAnglePicturePicture63636363160160160160400400400400100010001001000 063636363160160160160400400400400100010001001000 0Distance between two flat edges(four be

60、nds)0.200.250.250.300.400.300.400.500.751.00Partial forming1010252563N/AN/A1010252563N/AN/AHeight0.150.200.30N/AN/A0.200.300.50N/AN/APartial formingLength0.150.200.200.250.300.200.300.500.751.00Length of a blank holding surface (zero gap)0.15N/AN/AN/AN/A0.30N/AN/AN/AN/ADepth of a blank holding joint (zero gap)0.20