QC/T 268-2023 English PDF (QCT268-2023)

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QC/T 268-2023: Permissible automobile cold stamping variations in dimensions without tolerance indication
QC/T 268-2023
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
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
The Ministry of Industry and Information Technology approved 586 industry standards,
including "Ethylenediaminetetraacetic acid for industrial use" (see Attachment 1).
Among them, there are 32 chemical industry standards, 13 petrochemical industry
standards, 9 ferrous metallurgical industry standards, 51 non-ferrous metal industry
standards, 71 machinery industry standards, 43 automobile industry standards, 8
shipbuilding industry standards, 141 light industry standards, 35 textile industry
standards, 2 items packaging industry standards, 16 electronics industry standards, 165
communication industry standards. It approved 53 industry standards of foreign
language versions, including the "Evaluation method for coagulation performance of
water treatment agents" (see Attachment 2); among them, there are 16 chemical industry
standards, 4 non-ferrous metal industry standards, 3 rare earth industry standards, 8
building materials industry standards, 7 machinery industry standards, 2 light industry
standards, 3 textile industry standards, 10 communications industry standards. It is now
announced.
The above chemical industry standards (including foreign language versions) are
published by Chemical Industry Press. The petrochemical industry standards are
published by Sinopec Press. The ferrous metal industry standards, non-ferrous metal
industry standards (including foreign language versions), rare earth industry standards
in foreign language versions are published by Metallurgical Industry Press. The foreign
language version of building materials industry standards is published by China
Building Materials Industry Press. The machinery industry standards (including foreign
language versions) are published by Machinery Industry Press. The automotive industry
standards and packaging industry standards are published by Beijing Science and
Technology Press. The shipbuilding industry standards are published by The China
Institute of Comprehensive Technology and Economics of the Shipbuilding Industry.
The light industry standards (including foreign language versions) are published by
China Light Industry Press. The textile industry standards (including foreign language
versions) are published by China Textile Publishing House. The electronic industry
standards are published by China Electronics Technology Standardization Institute. The
communications industry standards (including foreign language versions) are published
by the People's Posts and Telecommunications Press. The communications industry
engineering construction standards are published by Beijing University of Posts and
Telecommunications Press.
Attachment: 43 automotive industry standard numbers, standard names,
implementation dates
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
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.