DKBA04500040-C钣金冲压件质量要求

1、DKBA华为技术有限公司内部部技术规范DKBA0.450.0040 REV C钣金冲压件质量要求Specification For Sheet-metal Punching Part 2012年07月30日发布 20012年09月1日实施华为技术有限公司Huawei Technologies Co., Ltd.版权所有 侵权必究究All rights reserved 密级：秘密 REF 文档编号 * MERGEFORMAT DKBA0.450.0040 REV.C TIME yyyy-M-d 2022-8-d华为机密，未经许可不得扩散 Huawei Confidential第页 Page P

2、AGE45 , Total NUMPAGES 45修订声明Revision declaration本规范拟制与解释部门门：整机工程部基基础平台部本规范的相关系列规范范或文件:无相关国际规范或文件一一致性：无替代或作废的其它规范范或文件：无相关规范或文件的相互互关系：无规范号主要起草部门专家主要评审部门专家修订情况DKBA0.450.0040 REV C基础平台部：潘建军（00118387）肖春秀(00053994)整机工程部：郭天次（0014571）许许志敏（00114402），黄黄涛（00121968）张张实（00118600），钟钟宏辉（00121959），张润孝（00049797）MQE

3、:陈亮（00068994）SQE:王进（00151357）1、增加了自铆质量要求求；2、刷新了钣金件公差要求求。DKBA0.450.0040 REV B质量成本管理部：肖春春秀53994整机工程部:周伟 00123276,郑玲 00119690李俊周 00123308,魏华 00102167杨曦晨 00152131,和永超 57041MQE：曾松来00125372TQC：马宝兴39736CEG：郑连东 001149491、将外观表面的定义义引用于DKBA0.400.00212、增加了翻边攻丝的的质量要求；DKBA0.450.0040 REV1.0质量成本管理部：肖春春秀53994质量成本管理部

4、：盛辉21628、周伟伟16271结构平台开发部：郑玲玲15593MQE：陈军17658TQC：马宝兴39736新归档目 录 TOC o 1-3 h z u HYPERLINK l _Toc329087766 1.技术要求 PAGEREF _Toc329087766 h 6 HYPERLINK l _Toc329087767 1.1. 外观及表面面状态一般要求 PAGEREF _Toc329087767 h 6 HYPERLINK l _Toc329087768 1.1.1. 零件的的毛刺面朝向要求求 PAGEREF _Toc329087768 h 6 HYPERLINK l _Toc3290

5、87769 1.1.2. 冲裁类类平板零件圆角要要求 PAGEREF _Toc329087769 h 6 HYPERLINK l _Toc329087770 1.1.3. 零件上上止裂孔、工艺槽槽要求 PAGEREF _Toc329087770 h 7 HYPERLINK l _Toc329087771 1.1.4. 弯曲零零件未注圆角R要求 PAGEREF _Toc329087771 h 7 HYPERLINK l _Toc329087772 1.1.5. 翻边攻攻丝质量要求 PAGEREF _Toc329087772 h 8 HYPERLINK l _Toc329087773 1.1.6.

6、 自铆质质量要求 PAGEREF _Toc329087773 h 9 HYPERLINK l _Toc329087774 1.1.7. 零件表表面的外观要求 PAGEREF _Toc329087774 h 10 HYPERLINK l _Toc329087775 1.2. 钣金冲压件件毛刺的要求 PAGEREF _Toc329087775 h 10 HYPERLINK l _Toc329087776 1.2.1. 毛刺的的高度定义 PAGEREF _Toc329087776 h 10 HYPERLINK l _Toc329087777 1.2.2. 结构件件的毛刺区域分类类 PAGEREF _

7、Toc329087777 h 10 HYPERLINK l _Toc329087778 1.2.3. 钣金冲冲压件毛刺质量要要求 PAGEREF _Toc329087778 h 14 HYPERLINK l _Toc329087779 1.2.4. 钣金冲冲压件的熔渣要求求 PAGEREF _Toc329087779 h 15 HYPERLINK l _Toc329087780 1.2.5. 钣金冲冲压件的接刀痕的的要求 PAGEREF _Toc329087780 h 15 HYPERLINK l _Toc329087781 1.3. 钣金冲压件件公差要求 PAGEREF _Toc329087

8、781 h 15 HYPERLINK l _Toc329087782 1.3.1. 公差要要求 PAGEREF _Toc329087782 h 15 HYPERLINK l _Toc329087783 1.3.2. 钣金件件冲压公差等级代代号及数值 PAGEREF _Toc329087783 h 16 HYPERLINK l _Toc329087784 1.3.3. 其它说说明 PAGEREF _Toc329087784 h 20 HYPERLINK l _Toc329087785 2.检验规则 PAGEREF _Toc329087785 h 21 HYPERLINK l _Toc329087

9、786 2.1. 检验类别 PAGEREF _Toc329087786 h 21 HYPERLINK l _Toc329087787 2.1.1. 一般检检验 PAGEREF _Toc329087787 h 21 HYPERLINK l _Toc329087788 2.1.2. 补充检检验 PAGEREF _Toc329087788 h 21 HYPERLINK l _Toc329087789 2.2. 检验原则 PAGEREF _Toc329087789 h 21 HYPERLINK l _Toc329087790 2.3. 检验规定 PAGEREF _Toc329087790 h 21图目

10、录TOC h z c 图 HYPERLINK l _Toc329955749 图 1 折弯件毛刺方方向示意图 PAGEREF _Toc329955749 h 6 HYPERLINK l _Toc329955750 图 2 平板件的尖角角示意图 PAGEREF _Toc329955750 h 6 HYPERLINK l _Toc329955751 图 3 止裂孔直径示示意图 PAGEREF _Toc329955751 h 7 HYPERLINK l _Toc329955752 图 4 工艺槽口示意意图 PAGEREF _Toc329955752 h 7 HYPERLINK l _Toc32995

11、5753 图 5 翻边攻丝示意意图 PAGEREF _Toc329955753 h 8 HYPERLINK l _Toc329955754 图 6 薄板连接用带带锥台翻边攻丝孔孔结构示意图 PAGEREF _Toc329955754 h 8 HYPERLINK l _Toc329955755 图 7 自铆连接示意意图 PAGEREF _Toc329955755 h 9 HYPERLINK l _Toc329955756 图 8 钣金件毛刺示示意图 PAGEREF _Toc329955756 h 10 HYPERLINK l _Toc329955757 图 9 户外机柜类A、B类区域判断示意意图

12、 PAGEREF _Toc329955757 h 12 HYPERLINK l _Toc329955758 图 10 室内机柜类类A、B类区域判断示意意图 PAGEREF _Toc329955758 h 13 HYPERLINK l _Toc329955759 图 11 插箱类A、B类区域判断示意意图 PAGEREF _Toc329955759 h 13 HYPERLINK l _Toc329955760 图 12 拉手条及面面板等小五金类A、B类区域判断示意意图 PAGEREF _Toc329955760 h 14 HYPERLINK l _Toc329955761 图 13 盒式类A、B类

13、区域判断示意意图 PAGEREF _Toc329955761 h 14 HYPERLINK l _Toc329955762 图 14 倒角高度示示意图 PAGEREF _Toc329955762 h 15表目录TOC h z c 表 HYPERLINK l _Toc329955737 表 1 平板件圆角半半径r值 PAGEREF _Toc329955737 h 6 HYPERLINK l _Toc329955738 表 2 普通翻边高高度H值和螺纹最少反反复打入次数 PAGEREF _Toc329955738 h 8 HYPERLINK l _Toc329955739 表 3 薄板连接用用带锥

14、台翻边攻丝丝孔翻边高度H值和螺纹最少反反复打入次数 PAGEREF _Toc329955739 h 9 HYPERLINK l _Toc329955740 表 4 自铆参数表 PAGEREF _Toc329955740 h 9 HYPERLINK l _Toc329955741 表 5 自铆连接点最最小承力表 PAGEREF _Toc329955741 h 9 HYPERLINK l _Toc329955742 表 6 毛刺高度的极极限值 PAGEREF _Toc329955742 h 15 HYPERLINK l _Toc329955743 表 7 钣金公差数数值表 PAGEREF _Toc

15、329955743 h 16 REF 文档名称 h * MERGEFORMAT 钣金冲压件质量量要求 Specification For Sheet-metal Punching Part范 围Scope:本规范规定了华为的钣钣金冲压件（表面面处理前）的质量量要求、检验规则则。本规范适用于华为所有有的钣金冲压件（表表面处理前），设设计图中有注明的的要求以设计图为为准，图中未注明明的按此规范为准准。简 介Brief introduction：规定了钣金冲压件(零零件级)的质量要求及检验验规则。关键词Key words：外观、表面状态、工艺艺槽口、圆角半径径、A类区域、B类类区域、毛刺、毛毛刺高度

16、华为技术文件优先级说说明：华为产品生产执行的技技术文件有：华为为图纸、华为企业业标准规范、通信信设备行业标准、中国国家标准、国际标准。这些些标准的优先级别别从高到低依次为为：华为图纸华为企业标准规规范-通信设备行业业标准-中国国家标准准-国际标准。如如果各级文件之间间有不一致的地方方，应按最高级别别的文件执行。在华为企业标准规范中中，产品专用标准准优先于通用技术术标准。术语和定义Term&Definition：缩略语Abbreviations 英文全名 Full spelling中文解释 Chinese explanationA类区域Class A Area在钣金供应商交货时，产产品在正常工作

17、位位置手能触膜到的的边角区域；以及及设计图中特别要要求的部位。B类区域Class B Area不属于A类的区域都为为B类区域毛刺Burr指板料冲裁后留在冲裁裁件断面边缘锋利利的凸起，毛刺高度Height Of Burr指板料冲裁后留在冲裁裁件断面边缘锋利利的凸起的高度毛刺面Surface of Burr指边缘有毛刺的冲裁件件平面。对于落料料，毛刺面是接触触凸模的平面；对对于冲孔，毛刺面面是接触凹模的平平面。1级表面Class 1 Surface重要外观表面，体现产产品外观形象，具具有装饰性，可以以直接正视到的主主要外观表面。主主要包括机柜、插插框（包括一体化化机箱和数通机箱箱）、无线射频模块块

18、、盒式结构、拉拉手条等的正面和和正面上主要零部部件的外表面、机机柜前门开门后的的正视面、高度小小于、等于1.8米米的机柜顶面（如如Hert中机柜柜顶面）等。2级表面Class 2 Surface主要外表面，半装饰性性的经常可见的外外观表面。主要包包括机柜方孔条正正面、机柜外部侧侧面、机柜后面、插框（包括一体体化机箱和数通机机箱）、无线射频模块的外部侧面和后面及及防护网等处经常常被打开的可视面面等。小五金件、机柜机箱附件等等均定义为2级表表面。3级表面Class 3 Surface次要外表面和内表面，不不是以装饰为目的的，表面质量要求求不高的结构表面面。主要包括机柜柜、插框（包括一一体化机箱和数

19、通通机箱）、无线射频模块、盒盒式结构、拉手条条等的内表面和底面、高度大于1.8米米的机柜顶面以及安装支架、绑绑线架、内部框架架、内部焊件的所有表面等。除除1、2级表面外外的表面均为3级级表面。 技术要求外观及表面状态一般要要求零件的毛刺面朝向要求求毛刺面朝向零件里面，如如图1：图 SEQ 图 * ARABIC 1 折弯件毛刺刺方向示意图特殊情况：按编码级分分析零件之间的装装配关系，零件的的毛刺面应在里面面或非功能面；如如“L”型的零件为滑道道，则毛刺面应在在零件的外面，与与上图相反。冲裁类平板零件圆角要要求图样上未注明的外形和和内缘小于或等于于90的尖角处应制成成圆角（见 REF _Ref15

20、1705188 n h * MERGEFORMAT 图2），其圆角半半径r按 REF _Ref151705646 n h * MERGEFORMAT 表1规定。图 SEQ 图 * ARABIC 2 平板件的尖尖角示意图表 SEQ 表 * ARABIC 1 平板件圆角角半径r值材料厚度 t 0.30.30.50.5112233圆角半径r0.20.30.511.50.5t零件上止裂孔、工艺槽槽要求当设计文件或图样上注注明允许开止裂孔孔或工艺槽口时，其其止裂孔直径和工工艺槽口尺寸，按按下列要求选择：1、止裂孔直径d（见见图3）不大于2t； 图 SEQ 图 * ARABIC 3 止裂孔直径径示意图2、

21、工艺槽口尺寸L和和b（见 REF _Ref151706294 n h * MERGEFORMAT 图4）；当t0.5mm时，1mmb1.5 t （如1.5t1，则b=1）；当t0.5mm时，b=1mm。Lt+r+0.5b图 SEQ 图 * ARABIC 4 工艺槽口示示意图弯曲零件未注圆角R要要求当图样上未注明弯曲半半径时，允许按内内弯曲半径R不大于t（t为材料厚）且最最小值为0.2。翻边攻丝质量要求1、普通翻边高度H值值和螺纹寿命满足足以下要求：图 SEQ 图 * ARABIC 5 翻边攻丝示示意图表 SEQ 表 * ARABIC 2 普通翻边边高度H值和螺纹最少反反复打入次数螺纹规格板厚T

22、翻边高度H（公差+0.30）内圆角R最大值最少反复打入次数M30.81.80.3121.02301.22.2301.52.430M41.02.4301.22.6301.5330M51.22.4301.52.7302、 薄板连接用的带带锥台翻边攻丝 该翻边攻丝孔用于薄板板连接的场景，实实现M3国标沉头头螺钉在0.8、1.0mm板材材上不凸出板面,使使翻边高度H值和螺纹寿命满满足以下要求图 SEQ 图 * ARABIC 6 薄板连接用用带锥台翻边攻丝丝孔结构示意图表 SEQ 表 * ARABIC 3 薄板连接接用带锥台翻边攻攻丝孔翻边高度H值值和螺纹最少反复复打入次数螺纹规格材料板厚T翻边后底孔内

23、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M3钢1000636316016040040010001000冲裁特征圆孔直径0.100.150.20-0.150.200.30-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030030030-1.0030030-特征分类尺寸分类特征示意图f级(精密精度)m级(中等精度)636316016

24、040040010001000636316016040040010001000成型特征孔到折弯边距离0.150.200.200.250.300.200.300.500.500.50(1次折弯)直边到折弯边距离0.150.200.200.250.300.200.300.500.500.50(1次折弯)孔间距0.200.250.250.300.400.250.300.500.500.75(2次折弯)折弯边到折弯边距离0.150.200.200.250.300.250.300.500.500.75(2次折弯)直边到折弯边距离0.200.250.250.300.400.300.400.500.751.

25、00(3次折弯)折弯边到折弯边距离0.250.300.300.400.500.300.400.500.751.00(4次折弯)孔间距0.200.250.250.300.400.300.400.500.751.00(4次折弯)特征分类尺寸分类特征示意图f级(精密精度)m级(中等精度)636316016040040010001000636316016040040010001000成型特征直边到直边距离0.200.250.250.300.400.300.400.500.751.00(4次折弯)局部成型1010252563-1010252563-形状尺寸0.150.200.30-0.200.300.5

26、0-局部成型0.150.200.200.250.300.200.300.500.751.00位置尺寸压死边长度0.15-0.30-压死边厚度0.2-0.3-(无间隙)00压死边厚度0.20-0.30-(有间隙)折弯角度0.50.50.50.50.51.01.01.01.01.0特征分类尺寸分类特征示意图f级(精密精度)m级(中等精度)636316016040040010001000636316016040040010001000其它特征喷涂保护尺寸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0.30.50.81.

27、530.50.81.535(平面内少量冲裁特征征)平面度0.50.81.5350.81.5357(平面内有成形、焊缝缝或密孔等特征)说明：上表适用于厚度不大于于1.5mm板材材，大于1.5mm厚厚度的板材其公差差可酌情相应增加加30%左右；上表适用于冷轧板、镀镀锌板等常用板材材，弹簧板等板材材其公差可酌情相相应增加；冲密孔（通风孔）尺寸寸公差可参照相应应冲裁尺寸公差放放大；压印、压字、加强筋、线桥、凸台、敲敲落孔、百叶窗等等特征公差均可参参照局部成形公差差值；压铆螺母/螺柱/螺钉钉等位置尺寸公差差值在其底孔的位位置尺寸公差值基基础上加0.05；注示为的冲裁角度、折弯角度的尺寸寸分段分别指相应应

28、特征冲裁短边尺尺寸、折弯短边尺尺寸数值分段；注示为的公差数值根根据工序调整（先先折弯后冲孔）可可按冲裁孔间距标标注公差；注示为的平面度尺寸寸分段指平面内最最大对角线长度尺尺寸分段；直线度公差值可参照上上表中的平面度公公差值执行；对于多于4折的折弯特特征，其累积公差差按每折加0.05的精度度来处理；对于多于4折的折弯特特征，可以提高其其中某一折的尺寸寸精度，提高的精精度值可参照1次次折弯精度；对于上表中未列出的特特征，其尺寸公差差可参照相似/相相近的特征公差来来处理；其它说明钣金件尺寸及公差要求求是指钣金件成品品尺寸及公差，即即表面处理（钝化化、氧化、电镀、喷涂等）后的尺尺寸及公差； 密级：秘密

29、 REF 文档编号 * MERGEFORMAT DKBA0.450.0040 REV.C检验规则检验类别一般检验一般检验是指根据设计计图样和工艺文件件的规定，对钣金金冲压件进行的外外观检验、尺寸及及公差配合检验及及常规性能检验。外观检验是依靠手摸、目测、光照反射射、光照投影等方方法对钣金冲压件件的外观进行检验验；尺寸及公差配合检验是是采用工具、夹具具、量具，以检验验钣金冲压件的尺尺寸、形状、位置置公差；一般检验可按工艺文件件要求或采用标准准样件作为对照判判定的依据。补充检验补充检验是指一般检验验以外的检验。它它包括硬度检验、磁性检验、弹性性检验、渗透检验验、无损探伤检验验等。检验原则钣金冲压件

30、必须进行首首件检验、巡回检检验和验收检验；钣金冲压件原则上只进进行一般检验；当设计图样或其它技术术文件有具体要求求时，应进行补充充检验；批量生产的钣金冲压件件，按需要可进行行抽检或全检，抽抽检的方法一般按按GB 2828和和GB 2829的规进行；全检一般仅检验验主要部分（包括括特定的外观要求求）。检验规定冲裁、剪切零件的外形形按最大尺寸处进进行测量；内孔按按最小尺寸处进行行测量；止裂孔直径及工艺槽口口尺寸，只在展开开料时检查，零件件成形后不作检查查；加工后易变形，而在装装配时能重新恢复复所需几何形状的的零件，其尺寸和和形状误差，可在在装配状态下测量量，在自由状态下下允许超出极限尺尺寸。 co

31、nfidentiality level: confidential REF 文档编号 * MERGEFORMAT DKBA0.450.0040 REV.C confidentiality level: confidential REF 文档编号 * MERGEFORMAT DKBA0.450.0040 REV.C TIME yyyy-M-d 2022-8-d华为机密，未经许可不得扩散 Huawei Confidential第Figure 1:Figure SEQ Figure * ARABIC 1 Burr of bendsExceptions: the burr surface is the

32、 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 opposite to the above diagram. Blanked and sheared panel parts taper angles with o

33、uter 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 REF _Ref215915616 n h * MERGEFORMAT Figure 2) with a radius (r) specified as Table 1.Figure SEQ Figure * ARABIC 2 Taper angles of panel partsTable SEQ Table * ARABIC 1 Ra

34、dius (r) of taper angleThickness (t) of materials 0.30.30.50.5112233Radius (r) of taper angle 0.20.30.511.50.5t 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 s

35、hown in REF _Ref215915666 n h Figure 3), should be smaller than or equal to 2 t;Figure SEQ Figure * ARABIC 3 Diameter of stop holesL and b, sizes of technical rabbets (as shown in REF _Ref215915667 n h Figure 4);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+0.5bFigur

36、e SEQ Figure * ARABIC 4 Technical rabbetParts 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.Requirements for flanging-hole with thread：Requirements for height(H) and Mi

37、n removable times of flanging (as shown in REF _Ref215915667 n h * MERGEFORMAT Figure 5) Figure SEQ Figure * ARABIC 5 Schematic diagram for flanging-hole with threadTable SEQ Table * ARABIC 2 The data of height(H) and Min removable timesThreadPlate thickness(T)Inner diameter of flanging-hole(D1)High

38、 of flanging-hole(H)(Tolerance 0+0.3)Max. RMin removable times(Time)M30.82.51.80.3121.02301.22.2301.52.430M41.03.32.4301.22.6301.5330M51.24.22.4301.52.7302、 Flanging-hole with thread for thin sheet connectedThe flanging-hole is used in thin sheet connected, to achieve that standard countersunk head

39、screw M3 could be sunk into the plate surface with thickness 0.8mm or 1.0 mm. Requirements for height(H) and Min removable times of flanging (as shown in REF _Ref215915667 n h * MERGEFORMAT Figure 6).Figure SEQ Figure * ARABIC 6 Schematic diagram for flanging-hole with thread for thin sheet connecte

40、dTable SEQ Table * ARABIC 3 The data of height(H) and Min removable times for flanging-hole with thread for thin sheet connectedThreadMaterialPlate 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 r

41、emovable times(Time)M3Steel 1000 63631601604004001000 1000BlankingHole diameter0.100.150.20N/AN/A0.150.200.30N/AN/ADistance between two holes0.100.150.200.250.300.150.200.300.400.50Distance between a hole and an edge0.100.150.200.250.300.150.200.300.400.50Distance between a line and an edge0.100.150

42、.200.250.300.150.200.300.400.50Blanking angle 030030030N/AN/A1.0030030N/AN/ACharacteristicDiameter, Distance, or AnglePictureLevel f (High Precision)Level m (Average Precision) 636316016040040010001000 63631601604004001000 1000FormingDistance between a hole and a bent flange0.150.200.200.250.300.200

43、.300.500.500.50(one bend)Distance between a bent flange and a flat edge0.150.200.200.250.300.200.300.500.500.50(one bend)Distance between two holes0.200.250.250.300.400.250.300.500.500.75(two bends)Distance between two bent flanges0.150.200.200.250.300.250.300.500.500.75(two bends)Distance between a

44、 flat edge and a bent flange0.200.250.250.300.400.300.400.500.751.00(three bends)Distance between two bent flanges0.250.300.300.400.500.300.400.500.751.00(four bends)Distance between two holes0.200.250.250.300.400.300.400.500.751.00(four bends)CharacteristicDiameter, Distance, or AnglePictureLevel f

45、 (High Precision)Level m (Average Precision) 636316016040040010001000 63631601604004001000 1000FormingDistance between two flat edges0.200.250.250.300.400.300.400.500.751.00(four bends)Partial forming 1010252563N/AN/A1010252563N/AN/AHeight0.150.200.30N/AN/A0.200.300.50N/AN/APartial forming0.150.200.

46、200.250.300.200.300.500.751.00LengthLength 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)0.2N/AN/AN/AN/A0.3N/AN/AN/AN/A00Depth of a blank holding joint (with gap)0.20N/AN/AN/AN/A0.30N/AN/AN/AN/ABending angle 0.50.50.50.50.51.01.01.01.01

47、.0CharacteristicDiameter, Distance, or AnglePictureLevel f (High Precision)Level m (Average Precision) 63631601604004001000 1000 63631601604004001000 1000OthersSize of a free-of-painting area1.01.51.51.52.01.01.51.51.52.0Length of a silk screen0.50.50.50.5N/A0.50.50.50.5N/AFlatness 0.30.50.81.530.50

48、.81.535(with little blanking processes)Flatness 0.50.81.5350.81.5357(with forming, welding, and piercing processes)The table applies only to metal sheets with depths less than or equal to 1.5 mm. For metal sheets with greater depths, the tolerances increase by around 30%.The table applies only to co

49、mmon metal sheets, such as cold-rolled sheets and galvanized sheets. Spring sheets allow larger tolerances.Size tolerances for high-density holes (ventilation holes) can be larger than blanking tolerances.For tolerances for imprinted marks, imprinted words, ribs, line bridges, embossments, knock-off

50、 holes, and shutters, see the tolerances for partial forming in the table.Size tolerances for rivet nuts, studs, or screws are 0.05 larger than those for hole sizes.Size segments of tolerances marked with correspond to the lengths of the shorter blanking flange and bent flange.Tolerances marked with

51、 are adjusted based the process sequence (bending first and piercing later) and can be the distance between two holes.Size segments of tolerances marked with correspond to the length of the longest diagonal line on a surface.Straightness tolerances equal the flatness tolerances.If more than four ben

52、ds are applied, tolerance for each additional bend increases by 0.05.Tolerances for listed characteristics in the table apply to similar unlisted characteristics.RemarksThe sizes, diameters, and distances and their tolerances apply to finished metal sheets that have undergone surface processing, such as passivation, oxidation, plating, and painting. confidentiality level: confidential REF 文档编号 * MERGEFORMAT DKBA0.450.0040 REV.CInspection Rule Inspection CategoryGeneral InspectionGe