JB/T 4129-1999 English PDF (JBT4129-1999)

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JB/T 4129-1999: Burr height standard for stampings
JB/T 4129-1999
ICS 25.020
J 32
INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Burr height standard for stampings
ISSUED ON. JUNE 24, 1999
IMPLEMENTED ON. JANUARY 1, 2000
Issued by. State Bureau of Machinery Industry, PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Definitions ... 4
3 Limits of burr’s height ... 4
4 Testing ... 5
Foreword
This Standard is equivalent to DIN 9830 "Burr height standard for stampings".
This Standard is the revised standard of JB 4129-85 " Burr height standard for
stampings". After discussion and comments, according to the representatives’ views,
the limits of burr height standard for stampings of sheet thickness ≤ 0.1 mm and > 0.1
~ 0.2 mm - have been modified appropriately. And it also makes editorial changes to
the previous standard.
This Standard replaces JB 4129-85 from the date of implementation.
This Standard was proposed and administered by the National Forging
Standardization Technical Committee.
This Standard was drafted by organization. The 4th Design Institute, State Bureau of
Machinery Industry.
Drafter of this Standard. Chen Hongfang.
Burr height standard for stampings
1 Scope
The value listed in this Standard are conceptually not allowed in the stamping
tolerance. However, general stamping parts come with varying degrees of burrs.
When the burr’s height exceeds a certain limit, it will affect the product quality and
usage performance.
This Standard applies to the finished metal stamping parts which have certain
requirements for burr’s height. It does not apply to the finished parts and precision
stamping parts which have special requirements for burrs.
2 Definitions
This Standard adopts the following definitions.
2.1 Burr’s height for stamping
Burr height for stamping refers to those left-over burrs on the section openings of the
finished stamping parts, when the material is stamped. It is shown in Figure 1.
Blanking stamping section Hole-punching section
h – Burr’s height;
t - Material thickness of the stamping part;
Figure 1
3 Limits of burr’s height
Limits of stamping burr’s height shall be specified in Table 1.