QC/T 268-2023 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| QC/T 268-2023 | English | 275 |
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Permissible automobile cold stamping variations in dimensions without tolerance indication
| Valid |
| QC/T 268-1999 | English | 130 |
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Extreme deviation for undeclared tolerance size of processing parts for automobile cold stamping
| Obsolete |
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QC/T 268-2023: Permissible automobile cold stamping variations in dimensions without tolerance indication
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QCT268-2023
QC
AUTOMOBILE INDUSTRY STANDARD
ICS 43.040
CCS T 33
Replacing QC/T 268-1999
Permissible automobile cold stamping variations in
dimensions without tolerance indication
Issued on. APRIL 21, 2023
Implemented on. NOVEMBER 01, 2023
Issued by. Ministry of Industry and Information Technology of the PRC
Table of Contents
Foreword... 6
1 Scope... 8
2 Normative references... 8
3 Terms and definitions... 8
4 Limit deviations of dimensions without tolerance indications for flat stamping... 8
5 Dimensional tolerance of formed bent parts... 11
6 Limit deviation of forming and drawing without tolerance indications... 13
7 Limit deviations of hole edge distance, hole center distance, hole group distance of
stamped parts without tolerance indications... 15
8 The method of expression in this document... 18
Announcement of Ministry of Industry and Information Technology
of the People's Republic of China
No.7, 2023
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document replaces QC/T 268-1999 "Extreme deviation for undeclared tolerance
size of processing parts for automobile cold stamping". Compared with QC/T 268-1999,
in addition to structural adjustments and editorial modifications, the main technical
changes are as follows.
a) ADD normative references (see Chapter 2);
b) DELETE the terms and definitions of "punching dimensions", directly quoting
the terms and definitions defined in GB/T 15055 (see Chapter 3; Chapter 2 of the
1999 edition);
c) DELETE the limit deviation provisions of holes and shafts without dimension
indications in Table 1; CHANGE "basic dimensions" to "nominal dimensions",
adding the tolerance grading (see 4.1; Table 1 of the 1999 edition);
d) CHANGE the "punching angle without tolerance indication" to "punching angle
without tolerance indication" (see 4.2; 3.4 of the 1999 edition);
e) CHANGE some values of the angle limit deviation in Table 3 (see 4.2.2; Table 3
of the 1999 edition);
f) CHANGE the "bending angle without tolerance indication" to "bending angle
without tolerance dimension indication" (see 5.2; 4.3 of the 1999 edition);
g) CHANGE the key "angle short side length mm" in Table 6 to "angle short side
length L/mm" (see 5.2.2; Table 6 of the 1999 edition);
h) ADD the grading for the limit deviation of the hole spacing without tolerance
indications affected by warpage (see 7.4.2);
i) CHANGE "T minimum" to "Tmin"; CHANGE "T nominal" to "T" (see 6.5; 5.5 of the
1999 edition).
Please note that some contents of this document may involve patents. The issuing
agency of this document does not assume the responsibility of identifying patents.
This document was proposed by AND shall be under the jurisdiction of the National
Automobile Standardization Technical Committee (SAC/TC 114).
Drafting organizations of this document. Dongfeng Motor Group Co., Ltd., Pan Asia
Automotive Technology Center Co., Ltd., Beijing Automotive Off-road Vehicle
Research Institute Co., Ltd.
The main drafters of this document. Ma Yongbin, Wang Ke, Long Conglin, Li Yan,
Wang Lixin, Zhu Yan, Zhou Xiaozhen, Cai Haohua, Chen Zhongchun, Xu Hongwen,
Zhang Xuewen, Cui Wei, Sun Xiaoming, Chen Pu.
This standard replaces the standard previously issued as follows.
- It was first published in 1989 as ZB/T 04006.3-1989;
- It was first revised in 1999 as QC/T 268-1999;
- This is the second revision.
Permissible automobile cold stamping variations in
dimensions without tolerance indication
1 Scope
This document specifies the permissible automobile cold stamping variations in
dimensions without tolerance indication in the drawings of automotive product parts.
This document is applicable to the permissible automobile cold stamping variations in
dimensions without tolerance indication in the drawings of automotive product parts.
2 Normative references
The contents of the following documents constitute the essential provisions of this
document through normative references in the text. Among them, for dated references,
only the version corresponding to that date applies to this document; for undated
references, the latest version (including all amendments) applies to this document.
GB/T 15055 Permissible stamping variations in dimensions without tolerance
indication
3 Terms and definitions
The terms and definitions defined in GB/T 15055 apply to this document.
4 Limit deviations of dimensions without tolerance
indications for flat stamping
4.1 Limit deviations of dimensions without tolerance indications for flat stamping
punching length L and diameter D/d
4.1.1 See Figure 1 for the flat stamping punching length L, diameter D/d, punching arc
radius R.
Figure 1
4.1.4 When the value of the internal and external corner radius r (see Figure 1) formed
by the two punching edges is not indicated on the drawing, r shall not be greater than
70% of the nominal material thickness.
4.2 Limit deviation of dimension without tolerance indication of punching angle
5 Dimensional tolerance of formed bent parts
5.1 Limit deviation of dimension bending length L and curling diameter d without
tolerance
5.1.1 Bending length L and curling diameter d are as shown in Figure 3.
Figure 3
5.2 Limit deviation of bending angle without tolerance indication
5.2.1 See Figure 4 for bending angle.
5.2.2 Limit deviation of bending angle without tolerance indication shall be as specified
in Table 6.
Table 6
6 Limit deviation of forming and drawing without tolerance indications
6.1 Limit deviation of drawing diameter d without tolerance indication
The limit deviation of drawing diameter d1 (Figure 1C)] without tolerance indication
shall be enlarged by 1 grade, according to the "Basic dimension" column in Table 1.
6.3 The limit deviation of the height of the reinforcing rib and reinforcing dimple
without tolerance indications
6.3.1 The height h of the reinforcing rib and reinforcing dimple is as shown in Figure
6.
Figure 6
6.3.2 The limit deviation of the height h of the reinforcing rib and reinforcing dimple
without tolerance indication shall be in accordance with Table 8
6.4 The limit deviation of the arc radius of the formed part without tolerance
indication
The limit deviation of the arc radius r of the formed part (see Figures 3, 5, 6) without
tolerance indication shall be in accordance with Table 9.
7 Limit deviations of hole edge distance, hole center distance, hole group distance of stamped parts without tolerance indications
7.1 Limit deviations of punching distance to edge of strip, flat strip and other
profiles without tolerance indications
7.1.2 Limit deviations of punching distance to edge of strip, flat strip and other profiles
without tolerance indications shall be specified in Table 10.
7.2 Limit deviation of center distance of holes connected to the same part without
tolerance indication
7.3 Limit deviation of center distance of holes connected to different parts without
tolerance indication
7.3.1 See Figure 9 for center distance of group holes connected to different parts.
Figure 9
7.3.2 Limit deviation of center distance of holes connected to different parts without
tolerance indication shall be specified in Table 12.
7.4 Limit deviation of hole spacing affected by warpage without tolerance
indication
8 The method of expression in this document
The limit deviation of the dimension without tolerance indication specified in this
document shall be expressed by the document number and tolerance grade symbol in
the corresponding drawings, technical documents or standards.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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