This standard specifies the general tolerances for cold stamped metal parts with a thickness of up to 12 mm. This standard applies to the general tolerances for cold stamped parts in the equipment components of electrical equipment. It can also be used as a reference for sheet metal parts processed by other processing methods and non-metal plate hole processing parts. JB/T 6753.3-1993 Electrical equipment equipment component tolerances Metal cold stamping general tolerances JB/T6753.3-1993 Standard download decompression password: www.bzxz.net

Subject content and scope of application
Mechanical Industry Standard of the People's Republic of China
Tolerances of equipment structures of electrical equipment
General tolerances of metal cold stamping parts
This standard specifies the general tolerances of metal cold stamping parts with a material thickness of up to 12mm. JB/T 6753.393
This standard applies to the general tolerances of cold stamping parts in equipment structures of electrical equipment. It can also be used as a reference for sheet metal parts processed by other processing methods and hole-processed parts of non-metal plates. 2 Reference standards
JB/T6753.1 Tolerances of equipment structures of electrical equipment JB/T6753.2 Tolerances of equipment structures of electrical equipment 3 Terminology
3.1 Flat stamping parts
General tolerances of sheet metal parts and structures and their selection rules General tolerances of metal shearing parts
Stamping parts processed into a flat shape by a flat punching process. 3.2 Formed stamping parts
Stamping parts processed by bending, drawing or other forming processes. 3.3 Hole spacing
The distance between the center lines of any two holes or two hole groups on the same part. 4
Tolerance grade
The general tolerances of linear dimensions and bending angles such as length, width, shape, hole or hole group spacing, hole margins and bending length, drawing diameter, curling diameter of formed stamping parts are divided into three levels: A, B, and C. According to the different requirements of the processed parts, they can be selected separately or mixed.
General tolerance
5.1 The general tolerances of linear dimensions are shown in Table 1. The value selection method shall be in accordance with Article 3.2 of JB/T6753.1. Table 1
Size segment
>30~120
>120~400
Approved by the Ministry of Machinery Industry on August 21, 1993
Implementation on October 1, 1993
Size segment
>400-1000
>1000~2000
>2000～4000
5.2 General tolerance of angle
The general tolerance of bending angle is shown in Table 2.
Bending angle
JB/T6753.3-93
The general tolerance of the angle of blanking parts is shown in Table 3.
Short side length
~~30
>30~120
120~400
>400~1000
±0°30
±0°20
±0°10
±0°05Www.bzxZ.net
±0°50m
±0°25'
±0°15'
±0°10
The general tolerance of the straightness of the bending line of the bent parts shall be taken according to Table 2 of Article 5.2 of JB/T6753.2. 6 Burr height
, burr height shall not exceed 10%~15% of the material thickness. 7 Marking
Conform to the provisions of Chapter 9 of JB/T6753.1.
Additional Notes:
This standard was proposed and managed by Beijing Comprehensive Technical and Economic Research Institute. >6~12
±0°20
This standard was drafted by Tianjin Electric Drive Design Institute, Xuchang Relay Research Institute, Shenyang Low Voltage Switch Factory, and Shanghai Huatong Switch Factory. Shanghai Electric Complete Plant, Kunming Switch Factory, Beijing Second Switch Factory, and Guangzhou Nanyang Electric Factory participated in the drafting. The main drafters of this standard are Guo Xiaohu, Li Cuihua, Cui Guochang, Tian Pu, and Huang Pan. 8
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