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QC/T 268-1999 English PDF (QCT268-1999)

QC/T 268-1999 English PDF (QCT268-1999)

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QC/T 268-1999: Extreme deviation for undeclared tolerance size of processing parts for automobile cold stamping

This Standard specifies limit deviation for undeclared tolerance size of dimensional elements formed by cold stamping process in automotive parts drawings. This Standard is applicable to limit deviation for undeclared tolerance size of cold stamping processing parts in automotive drawing.
QC/T 268-1999
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
Replacing ZB T04 006.3-89
Limit deviation for undeclared tolerance size of
processing parts for automobile cold stamping
APPROVED ON: MARCH 15, 1999
IMPLEMENTED ON: MARCH 15, 1999
Issued by: State Bureau of Machine Building Industry
Table of Contents
1 Subject content and scope of application ... 3
2 Terms ... 3
3 Limit deviation of undeclared tolerance size of flat stamping ... 3
4 Size tolerance of formed bending piece ... 6
5 Limit deviation for undeclared tolerance size of formed drawing ... 8 6 Limit deviation for undeclared tolerance size of hole margin, hole center distance and hole group distance of punching pieces ... 10
Limit deviation for undeclared tolerance size of
processing parts for automobile cold stamping
1 Subject content and scope of application
This Standard specifies limit deviation for undeclared tolerance size of dimensional elements formed by cold stamping process in automotive parts drawings.
This Standard is applicable to limit deviation for undeclared tolerance size of cold stamping processing parts in automotive drawing.
2 Terms
Punching size: The measured size of the bright belt part of the punching blank. 3 Limit deviation of undeclared tolerance size of flat
stamping
3.1 The limit deviations of the undeclared tolerance size of the flat stamping punching length L, the diameters D, d, are in accordance with Figure 1 and Table 1.

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