DKBA04500040-C钣金冲压件质量要求(6)

confidentiality level: confidential

DKBA

Specifications for Sheet-metal Punching Parts

Scope

This specification covers the general quality requirements and inspection rules for Huawei sheet-metal punching parts (before surface treatment).

This specification applies to Huawei’s all sheet-metal punching parts (before surface treatment). Reference is given to the design drawings with noted requirement and to this specification if not noted in the design drawing.

Brief Introduction

This specification provides the general quality requirements and inspection rules for sheet-metal punching parts.

Keywords

Appearance, surface status, technical rabbet, fillet radius, class A area, class B area, burr, and burr height.

Revision Declaration

Statement on the Priority of Huawei Technical Documents

Huawei products are manufactured based on the following documents which are 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 enterprise technical standards, specific product standards have higher priorities than general standards.

Term & Definition

Full Spelling Class A Area Chinese Explanation Corner areas touchable by hands in the normal working position of products when delivered by sheet-metal suppliers; and areas specially required in design drawings. Areas except for Class A Area Burr on the cross section of finished products when blanking sheet metal Burr height on the cross section of finished products when blanking sheet metal Class B Area Burr Height Of Burr 2014-1-3

华为机密，未经许可不得扩散 Huawei Confidential 第26页, 共44页 Page 26 , Total 44

2014-1-3

confidentiality level: confidential

DKBA

Full Spelling Chinese Explanation Level 1 Surface Critical 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 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 2 Surface Major outer surface is half-decorative and is commonly seen, 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 of the ironware and accessories of the cabinet and chassis are all defined as level 2 surfaces. Level 3 Surface Minor 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 (involving 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 surfaces are level 3 surfaces. 华为机密，未经许可不得扩散 Huawei Confidential 第27页, 共44页 Page 27 , Total 44

confidentiality level: confidential

DKBA

1. Technical Requirements

1.1. General Requirements for Appearance and Surface

1.1.1. The burr surface is required to be inside the parts, as shown in 错误！未找到引用源。:

Figure 1 Burr of bends

Exceptions: 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 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 angle

Figure 2 Taper angles of panel parts

Table 1 Radius (r) of taper angle

Thickness (t) 2014-1-3

≤0.3 >0.3~0.5 >0.5~1 >1~2 >2~3 >3 华为机密，未经许可不得扩散 Huawei Confidential 第28页, 共44页 Page 28 , Total 44

confidentiality level: confidential

DKBA

of materials Radius (r) of 0.2 0.3 0.5 1 1.5 0.5t taper angle ≤ 1.1.3. 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.

1、 d, diameter of stop holes (as shown in 0), should be smaller than or equal to 2 t;

Figure 3 Diameter of stop holes

2、 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+0.5b

Figure 4 Technical rabbet

1.1.4. 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 for flanging-hole with thread：

2014-1-3

华为机密，未经许可不得扩散 Huawei Confidential 第29页, 共44页 Page 29 , Total 44

confidentiality level: confidential

DKBA

1、 Requirements for height(H) and Min removable times of flanging (as shown in 05)

Figure 5 Schematic diagram for flanging-hole with thread Table 2 The data of height(H) and Min removable times

High of Plate Inner diameter of flanging-hole(H) thickness(T) flanging-hole(D1) (Tolerance 0～+0.3) 0.8 1.0 M3 1.2 1.5 1.0 M4 1.2 1.5 1.2 M5 1.5

2、 Flanging-hole with thread for thin sheet connected

The flanging-hole is used in thin sheet connected, to achieve that standard countersunk head 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 06).

Φ4.2 2.7 30 Φ3.3 Φ2.5 2.2 2.4 2.4 2.6 3 2.4 0.3 30 30 30 30 30 30 1.8 2 Min removable times (Time) 12 30 Thread Max. R 2014-1-3

华为机密，未经许可不得扩散 Huawei Confidential 第30页, 共44页 Page 30 , Total 44

百度搜索“77cn”或“免费范文网”即可找到本站免费阅读全部范文。收藏本站方便下次阅读，免费范文网，提供经典小说综合文库DKBA04500040-C钣金冲压件质量要求(6)在线全文阅读。