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GB/T 41859-2022: Sheet metal precise cold bending - Technical specification
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 41859-2022 | English | 269 |
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Sheet metal precise cold bending - Technical specification
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GB/T 41859-2022
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Basic data | Standard ID | GB/T 41859-2022 (GB/T41859-2022) | | Description (Translated English) | Sheet metal precise cold bending - Technical specification | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J32 | | Classification of International Standard | 25.020 | | Word Count Estimation | 14,182 | | Date of Issue | 2022-10-14 | | Date of Implementation | 2022-10-12 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 41859-2022: Sheet metal precise cold bending - Technical specification---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Sheet metal precise cold bending -- Technical specification
ICS 25.020
CCSJ32
National Standards of People's Republic of China
Specification for precision cold-formed sheet metal forming process
Published on 2022-10-12
2022-10-12 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
directory
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 General 1
5 Process 7
Appendix A (Normative) Calculation Table 8 of Neutral Layer Arc Length of U-shaped Piece
Reference 9
foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents.
This document is proposed and managed by the National Technical Committee for Standardization of Forging and Pressing (SAC/TC74).
This document is drafted by. Shanghai Jiaotong University, Dongguan Hengli Mould Technology Industry Development Co., Ltd., Beijing Electromechanical Research Institute Co., Ltd.
Company, Wuxi Pengde Auto Parts Co., Ltd., Inner Mongolia First Machinery Group Co., Ltd., Weihai Huabang Fine Blanking Technology Co., Ltd.,
Anhui Jianghuai Automobile Group Co., Ltd., Elite Energy Equipment Co., Ltd., Hubei Sanhuan Forging Co., Ltd., China Heavy Machinery
Machinery Research Institute Co., Ltd.
The main drafters of this document. Zhuang Xincun, Zhao Zhen, Wu Guohong, Qin Sixiao, Tan Zhengguang, Li Junjie, Jing Qian, Huang Tao, Dou Lifa, Ren Xiufeng,
Zhu Rongyu, Wei Wei, Zhang Wen, Ye Futian, Zhou Lin, Tan Tianning, Kou Haili, Zhang Peng, Zhao Xingming, Ruan Guoyong, Huang Jieliang, Xue Hongyan, Guan Chaoyu, Chang Meisheng,
Wu Liang, Liu Yong.
Specification for precision cold-formed sheet metal forming process
1 Scope
This document specifies the specification for the precision cold-formed sheet metal forming process, including general requirements, unfolded length of bent parts, accuracy of bent parts, bending
Springback control, mold design and process.
This document is applicable to the preparation of the process for precision cold bending of sheet metal on a press.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations
documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to
this document.
GB/T 4863 Basic terms of mechanical manufacturing process
GB/T 8541 Forging Terms
GB/T 13914-2013 Dimensional tolerance of stamping parts
GB/T 13915-2013 Angle tolerance of stamping parts
GB/T 13916 Stamping parts shape and position without tolerance
GB/T 15055 Stamping parts unmarked tolerance dimensional limit deviation
JB/T 5109-2001 Design specification for sheet metal bending process
3 Terms and Definitions
Terms and definitions defined in GB/T 4863 and GB/T 8541 apply to this document.
4 General
4.1 General requirements
4.1.1 The minimum bending radius of commonly used materials shall comply with the provisions of JB/T 5109-2001.When the bend line is at an angle to the rolling direction
When, the intermediate value between the vertical and parallel rolling directions shall be taken.
4.1.2 The structural manufacturability of bending parts shall comply with the provisions of JB/T 5109-2001.
4.1.3 The selection of precision cold forming equipment should comply with the provisions of JB/T 5109-2001.
4.2 Expanded length of bending part
4.2.1 Calculation method of arc radius of neutral layer
The neutral layer of the bending part is shown in Figure 1, and the arc radius ρ of the neutral layer should be calculated according to formula (1).
ρ=r xt (1)
where.
ρ--- the arc radius of the neutral layer, in millimeters (mm);
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