This standard specifies the process parameters and specifications required for the design of sheet metal bending process. JB/T 5109-2001 Specification for the design of sheet metal bending process JB/T5109-2001 Standard download decompression password: www.bzxz.net

ICS25.020
Standard of the Machinery Industry of the People's Republic of China
JB/T5109-2001
Technological design specification of bending for sheet metal2001-06-04Promulgated
China Machinery Industry Federation
2001-10-01Implementation
JB/T5109—2001
This standard is a revision of B/T5109-1991 "Technological design specification of bending for sheet metal". The main parts of the technical content supplement and revision are: - Some material grades in Table 1 and Table 2 are marked with the new national standard. The unreasonable phenomenon of using the same symbol to represent different parameters is corrected. This standard replaces JB/T5109—1991 from the date of implementation. Appendix A and Appendix B of this standard are both standard appendices. This standard is proposed and managed by the National Technical Committee for Forging Standardization. This standard was drafted by Xi'an Jiaotong University and Xiyi Group Corporation. The main drafters of this standard are Guo Cheng, Chu Jiayou, Yang Tongxin and Guo Wenlai. This standard was first issued in July 1991 and this is the first revision. 1
Mechanical Industry Standard of the People's Republic of China
Technological design specification df bnding for sheetmetal Scope
This standard specifies the process parameters and specifications required for the design of sheet metal bending process. This standard applies to the cold bending of sheet metal on a press. Referenced Standards
JB/T5109—2001
Replaces JB/T5109—1991
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T 4863—1985
GB/T 13914—1992
GB/T13915—1992
GB/T 139161992
GB/T15055—1994
3 Structural processability of press-bent parts
3.1 Press-bend radius
3.1.1 Marking of press-bend radius
Basic terms of mechanical manufacturing technology
Dimensional tolerance of stamping parts
Angular tolerance of stamping parts
Shape and position of stamping parts without tolerances
Limit deviation of dimensions of stamping parts without tolerances When marking the dimensions of press-bend parts, the inner fillet radius should be given. 3.1.2 Minimum bending radiusbzxZ.net
The minimum bending radius is the radius of the inner corner of the part that can be bent under the condition that the outer fiber of the rough surface does not crack. The minimum bending radius is only used when necessary. In other cases, the bending radius should be appropriately enlarged. The minimum bending radius of commonly used materials is shown in Table 1. Table 1
08F, 08A1
10, 15, Q195
20, Q215A, Q235A, 09MnXtL
25, 30, 35, 40, Q255A, 10Ti, 13MnTi, 16ML,
16MnXIL
Bending line is perpendicular to the rolling grain
China Machinery Industry Federation 2001-0604 approved bending line parallel to rolling grain
2001-10.01 implementation
1Cr18Ni9
HP659-1
BZn15-20
QSh65-0.1
L3, L4
LF5, LF6,
cold work hardening
1t in the table is the thickness of the sheet.
JB/T5109—2001
Table 1 (complete)
bending line perpendicular to rolling grain
bending line parallel to rolling grain
2the values ​​in the table apply to the following conditions: the raw materials are in the delivery state, 90°V-shaped correction bending, the rough plate thickness is less than 20mm, and the bright band of the rough shear section is outside the bend. 2
Width is greater than 3 times the plate thickness,
3.1.3 Bending radius series
Preferred series for the inner fillet radius of the bending parts: JB/T
5109—2001
01,02.03,05,08.10,1215.20.25,3.4.5,6,8,1012,15.20,25.30,3540，45，50，63，80，100mm.
3.2 Minimum bending height
In order to ensure the bending quality of the workpiece, the straight edge of the bending part should not be less than the minimum bending height. When the bending is at a right angle (Figure 1), the minimum bending edge height hm is as shown in formula (1):
3.3 Minimum hole margin distance
When there is a hole near the bending edge, the distance from the hole to the bending edge should not be less than the minimum hole margin distance. When the bending is at a right angle (Figure 2), the minimum hole margin distance Imimn is as shown in formula (2):
min=+2t
3.4 ​​Symmetry of shape and size
In order to ensure the bending quality of the workpiece, the shape and size of the bent part should be as symmetrical as possible, as shown in Figure 3, R=R2, R=R4. Figure 2
3.5 Width at the bending point
When the sheet metal is bent, the cross-sectional shape of the deformation zone is distorted (Figure 4), the width of the inner surface is bi>b, and the width of the outer surface is b
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