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This standard shall replace GB/T 15055-1994 "Permissible Stamping Variations in Dimensions without Tolerance Indication".
This standard was developed by making reference to parts of the contents of GB/T 13914-2002 "Tolerance of Dimensions for Stampings", GB/T 13915-2002 "Tolerance of Angles for Stampings" and GB/T 1804-2000 "General Tolerances-Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications", therein, some tolerances were adjusted, the chapter of "Terms and Definitions" was added and some editorial changes were made.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of National Technical Committee 74 on Forging of Standardization Administration of China.
Drafting organizations of this standard: Xi'an Jiaotong University and Beijing Research Institute of Mechanical & Electrical Technology.
Chief drafting staffs of this standard: Guo Cheng, Zhang Qiansheng, Wu Huaying and Shi Dongcai.
The previous edition of the standard replaced by this standard is as follows:
GB/T 15055-1994.
Permissible Stamping Variations in Dimensions without Tolerance Indication
冲压件未注公差尺寸极限偏差
1 Scope
This standard specifies the tolerance classes of and permissible variations in the linear and angular dimensions of stampings without individual tolerance indications.
This standard is applicable to metal stampings, and the non-metal stampings may also be made reference thereof.
The permissible variations specified in this standard are applicable to the non-mating dimensions.
The precision stamping and extruded parts may be made reference to this standard.
2 Terms and Definitions
The following terms and definitions are applicable to this standard.
2.1
Blanking size
The linear dimensions of the stampings processed through punching, blanking and other separating procedures (see d and D in Figure 1 and D in Figure 3)
Figure 1 Blanking Size
2.2
Forming size
The linear dimensions of the stampings processed through bending, drawing and other forming procedures (see l1 and l2 in Figure 2 as well as d and h in Figure 3)
Figure 2 Linear and Angular Dimensions of Bending Parts
Figure 3 Linear Dimensions of Drawing Parts
2.3
Blanking corner radius
The linear dimension of corner radius of the stamping processed through punching, blanking and other separating procedures (see R in Figure 4)
Figure 4 Blanking Corner Radius and Blanking Angle
2.4
Forming corner radius
The linear dimensions of corner radius of the stampings processed through bending, drawing and other forming procedures (see r, r1, r2 and r3 in Figure 2 and Figure 3)
2.5
Blanking angle
The angular dimension formed by blanking at the flat plate or the plane of formed part (see a in Figure 4)
Foreword I
1 Scope
2 Terms and Definitions
3 Tolerance Class
4 Permissible Variations in Dimensions without Tolerance Indication
5 Representation Method for Adopting This Standard
