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GB/T 15055-2021 PDF in English


GB/T 15055-2021 (GB/T15055-2021, GBT 15055-2021, GBT15055-2021)
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GB/T 15055-2021: PDF in English (GBT 15055-2021)

GB/T 15055-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.020
CCS J 32
Replacing GB/T 15055-2007
Permissible stamping variations in dimensions without
tolerance indication
ISSUED ON. OCTOBER 11, 2021
IMPLEMENTED ON. MAY 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3 
1 Scope... 5 
2 Normative references... 5 
3 Terms and definitions... 5 
4 Tolerance grades... 9 
5 Limit deviation of dimensions without tolerance indication... 9 
6 Representation method for grades of tolerances without indication... 10 
Permissible stamping variations in dimensions without
tolerance indication
1 Scope
This document specifies linear and angular dimension tolerance grades and limit
deviations of stamping pieces without tolerance indication.
This document applies to metal stamping pieces. Non-metal stamping pieces may refer
to this document.
The limit deviations specified in this document apply to non-fitted dimensions.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 8541, Terminology of forging and stamping
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 8541 as
well as the followings apply.
3.1 blanking size
The linear dimensions of stamping pieces processed by blanking, punching and other
separation processes (see D, d, s1, s2 in Figure 1).
mm
3.5 blanking angle
At the plane of the flat or formed piece, the angular dimension formed by blanking (see
α in Figure 4)
3.6 bending angle
The angular dimension of the stamping piece processed by the bending forming process
(see β in Figure 2).
4 Tolerance grades
The limit deviation of blanking size without tolerance indication, forming size without
tolerance indication, blanking corner radius size without tolerance indication, blanking
angle size without tolerance indication and bending angle size without tolerance
indication are divided into f, m, c, v, four descending tolerance grades. The limit
deviation of forming corner radius size without tolerance indication is not divided into
the tolerance grades. Tolerances shall be indicated for dimensions of 0.5mm and below.
5 Limit deviation of dimensions without tolerance indication
5.1 Limit deviation of blanking size without tolerance indication
The limit deviation of blanking size without tolerance indication shall be specified in
Table 1.
5.2 Limit deviation of forming size without tolerance indication
The limit deviation of forming size without tolerance indication shall be specified in
Table 2.
5.3 Limit deviation of corner radius size without tolerance indication
5.3.1 The limit deviation of blanking corner radius size without tolerance indication
shall be specified in Table 3.
5.3.2 The limit deviation of forming corner radius size without tolerance indication shall
be specified in Table 4.
5.4 Limit deviation of angular size without tolerance indication
5.4.1 The limit deviation of blanking angle size without tolerance indication shall be
specified in Table 5.
5.4.2 The limit deviation of bending angle size without tolerance indication shall be
specified in Table 6.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.