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GB 4674-2009: Safety code for grinding machines
GB 4674-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.110; 25.100.70
C 68
Replacing GB 4674-1984
Safety code for grinding machines
ISSUED ON. MARCH 31, 2009
IMPLEMENTED ON. DECEMBER 01, 2009
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1  Scope ... 5 
2  Normative references ... 5 
3  Safety requirements for the design and manufacture of grinding machines ... 5 
4  Safety requirements for the use of grinding machines ... 17 
5  Management and maintenance of grinding machines ... 21 
Foreword
All contents of this Standard are compulsory.
This Standard is the revision of GB 4674-1984. Compared with GB 4674-1984, the main
changes of this Standard are as follows.
-- “Foreword” is added;
-- “Introduction” is revised to be “Scope” (Chapter 1 of edition-1984; Chapter 1 of this
edition);
-- The Chapter “Normative reference” is added (see Chapter 2 of this edition);
-- The general requirements for design and manufacture of grinding machines are
added (3.1 of this edition);
-- 2.2.1 of edition-1984 is revised to be “the grinding wheel spindle shall be designed to
be able to operate with the maximum allowable load” (2.2.1 of edition-1984; 3.2.1 of
this edition);
-- The requirements for clamp nuts of grinding wheel spindle are added (3.4 of this
edition);
-- Regulations for marks of grinding machines are added (3.14 of this edition);
-- Regulations of modification, reformation and parts replacement for grinding
machines are deleted (2.13 of edition-1984);
-- The requirements for grinding wheel checking are revised. the mark checking is
added (3.1.1 of edition-1984, 4.1.1.1 of this edition);
-- Requirements for compaction of grinding wheel and grinding wheel chuck are
revised, which stipulates that the pad shall totally cover the contacting surface of the
grinding wheel chuck (3.3.3 of edition-1984, 4.3.2 of this edition);
-- The requirements for grinding wheel carrying are revised; add the stipulation that
“the marks printed with grinding wheel features and safety speed shall not be
smeared or damaged without permission” (4.1 of edition-1984, 5.1 of this edition);
-- The stipulation “changing grinding machines’ structure and performance are strictly
prohibited without the approval of chief engineer” is deleted (4.6 of edition-1984);
-- Add the terms of guaranteeing personal safety, and the training and assessment
requirements for the operating personnel (5.10, 5.11, 5.12 and 5.13 of this edition);
-- Appropriate revisions are made in text editing.
This Standard was proposed by State Administration of State Work Safety Supervision
Authority.
This Standard shall be under the jurisdiction of National Technical Committee of Work
Safety standardization.
Drafting organization of this Standard. Tangshan Institute of China Coal Research Institute,
Kailuan ( Group) Co., Ltd., and CNR Tangshan Railway Vehicles Equipment Co., Ltd.
Main drafters of this Standard. Zhang Wenjun, Wang Zhongchang, Zhang Ruixi, He
Xiaoqun, Wei Guanghou, Chen ying, and Mou JianHua.
Previous version replaced by this Standard is as follows.
— GB 4674-1984.
Safety Code for Grinding Machines
1 Scope
This Standard stipulates the safety technical requirements in design and manufacture, use,
management and maintenance of grinding machines.
This Standard applies to the grinding machines that use grinding wheel or grinding
segment to conduce manual, mechanical or automatic process.
This Standard does not apply to grinding processing machines that use grinding head with
a handle, coated abrasive tools, oilstone and grinding paste.
2 Normative references
The articles contained in the following documents have become part of this Standard
when they are quoted herein. For the dated documents so quoted, all the modifications
(excluding corrections) or revisions made thereafter shall not be applicable to this
Standard. For the undated documents so quoted, the latest editions shall be applicable to
this Standard.
GB/T 6171 Hexagon nuts, style 1, with fine pitch thread (eqv ISO 8673.1999)
GB 12348 Emission standard for industrial enterprises noise at boundary
GB/T 16769 Metal-cutting machine tools - Measurement method of sound pressure
level (neq ISO/DIS 230-5-2.1996)
JB/T 9878 Measurement of dust concentration of metal-cutting machine tool
3 Safety requirements for the design and
manufacture of grinding machines
3.1 General requirements
3.1.1 The design shall, as possible, eliminate or reduce all potential dangerous factors.
3.1.2 Necessary safety devices shall be adopted, in case of dangers that cannot be
avoided or fully restrained through design.
Table 1 The matching of grinding wheel hole diameter and the grinding wheel
spindle or grinding wheel chuck (mm)
Grinding wheel
hole diameter
Diameter of grinding wheel
spindle or grinding wheel chuck Grinding methods
H11 f7 Mirror-surface grinding, thread grinding, and high-speed grinding with running speed >45 m/s
H12 e8 Fine grinding
H13 e8 Corse grinding
3.3 Grinding wheel chuck
3.3.1 The diameter of grinding wheel chuck shall not be less than 1/3 of that of the
grinding wheel. The diameter of the grinding wheel chuck for cutting-off wheel shall not be
less than 1/4 of that of the grinding wheel.
3.3.2 For any form of grinding wheel chuck, the diameter of its left-right sides shall equal
the radial width of the compaction surface.
3.3.3 The grinding wheel chuck shall be able to reliably transmit the driving force to the
grinding wheel.
3.3.4 The grinding wheel chuck shall have enough stiffness to ensure that the compaction
surface is flat and evenly contacted after being compacted.
3.3.5 There shall be enough space at the non-contacting parts between the grinding
wheel chuck and the two sides of the grinding wheel; and the minimum size of the space
shall be 1.5mm.
3.3.6 Each surface of the grinding wheel chuck shall be smooth and without sharp edges,
and have good dynamic balance performance.
3.3.7 Grinding wheel chuck can be divided into.
a) Groove-type (Figure 2a). It is used to install grinding wheel that has a small hole
diameter and is directly mounted on the grinding wheel spindle.
b) Sleeve-type (Figure 2b). It is used to install grinding wheel with a large hole
diameter.
c) Liner-type (Figure 2c). It is used to install grinding wheel with a large hole diameter
and with thickness more than 32cm.
d) Cone-type (Figure 2d). It is used to install double bevel frame grinding wheel.
verification. Shield of grinding wheel with operating speed less than or equal to 40 m/s can
also select other materials, but their strength shall not be less than the value specified in
this Standard.
3.5.11 The upper end of the shield opening shall be equipped with an adjustable guard
plate to adjust the clearance between the guard plate and peripheral surface according to
the abrasion of the grinding wheel. The guard plate shall be fixed on the grinding wheel
shield; the binding strength shall not be lower than that of the components of the grinding
wheel shield; the guard plate width shall be larger than that of the outer circle part of the
grinding wheel shield.
When the shield’s opening angle above the level of the grinding wheel spindle center line
is less than 30°, the guard plate does not have to be installed.
3.5.12 The clearance between the grinding wheel’s peripheral surface and the adjustable
guard plate edge shall be less than 6 mm. During the installation of the grinding wheel
with the maximum design thickness, the clearance between the outer side surface of the
grinding wheel chuck and the opening edge of the grinding wheel shield shall be less than
15 mm. The clearance between the inner wall of the annular-band-type grinding wheel
shield and the peripheral surface of the grinding wheel shall not be more than 15 mm.
Grinding machines with the grinding wheel rotation center line in the same direction of the
operator’s facing direction can be exempted from 6-mm clearance regulation.
When the shield’s opening angle above the level of the grinding wheel spindle center line
is less than 30°, the 6-mm clearance does not have to be guaranteed.
3.6 The rotation direction shall be marked on the spindle of the grinding machine, and the
mark shall be visible and can remain visible for long-time.
3.7 Handheld grinding machine shall not have work-piece bracket; its position shall be
able to be adjusted according to the abrasion of the grinding wheel; the table height of the
work-piece bracket shall be at the same level of the grinding wheel spindle center line;
and there shall be enough area to guarantee the stability of the work-piece to the grinded.
The work-piece bracket’s edge near the grinding wheel shall have no sinking, unfilled
corner or other flaws.
3.8 Guard plates shall be set at the two ends of or around the surface grinder workbench
to prevent grinded work-piece flying out.
3.9 Grinding machines with electric, pneumatic or hydraulic clamping work-piece shall be
equipped with interlocking devices, which means that the grinding shall stops as soon as
the clamping force disappears.
3.10 All rotating members on the grinding machines, such as gri...