JB 9973-1999 This standard is a revision of ZB J62 006.7-87 "Forging Machinery Noise Limits and Air Hammer Noise Limits". This standard specifies the noise limits for the sound power level and sound pressure level of air hammers. This standard applies to air hammers for free forging. This standard was first published in April 1987. JB 9973-1999 Air hammer noise limit JB9973-1999 standard download and decompression password: www.bzxz.net

[CS25.120.01www.bzxz.net
J62
JB
Machinery Industry Standard of the People's Republic of China
JB9973-1999
Air hammer
1999-05 -14 Release
Noise Limits
Implemented on 2000-01-01
National Machinery Industry Bureau
Release
JB9973-1999
Foreword
This standard is a revision of ZBJ62006.7-87 "Forging Machinery Noise Limits and Air Hammer Noise Limits". The technical content of this standard is basically the same as that of ZBJ62006.7-87, and has only been re-edited in accordance with relevant regulations. This standard will be implemented from January 1, 2000. This standard replaces ZBJ62006.7-87 from the date of implementation. Appendix A of this standard is an appendix to the standard.
This standard is proposed and centralized by the National Forging Machinery Standardization Technical Committee. The unit responsible for drafting this standard: Anyang Forging Equipment Factory. This standard was first published in April 1987.
Scope
Machinery Industry Standard of the People's Republic of China
Air hammer
Noise limit
This standard specifies the sound power level and sound pressure of the air hammer level noise limits. This standard applies to air hammers for free forging. Referenced standards
2
JB 99731999
replaces ZB J62 006.7-87
The provisions contained in the following standards constitute part of this standard through reference in this standard Articles. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. JB/T3623I984
Forging machinery noise measurement method
JB/T1827.1~1999
Air chain technical conditions
3 noise limits
Air The noise A-weighted sound power level Lw of the hammer when the hammer is lifted and pressed should not be greater than the requirements in Table 1. 3.1
Table 1
Weight of dropped part of air hammer
kg
Sound power level Lw
dB(A)
40|| tt||87
>4075
95
>75~560
105
>560
112
3. When the air hammer is mentioned, the noise A-weighted sound pressure level L at the specified position when the radium pressing action is standardized should not be greater than the requirements in Table 2. Table 2
Weight of dropped part of air hammer
kg
Sound pressure level L
dB(A)
Measurement method
≤40
75
The measurement method of this standard should be in accordance with the provisions of JB/T3623. 5 Air hammer action specifications
>4075
82
The action specifications of the air hammer when measuring noise should comply with the provisions of B/T1827.1. Approved by the State Machinery Industry Bureau on 1999-05-14>75~560
90
>560
92
Implemented on 2000-01-01
2
Instructions for use
JB9973-1999
The instructions for use of this standard are shown in Appendix A (Standard Appendix) JB9973-1999
Appendix A
(Standard Appendix)
Instructions for use of this standard
A1 Any newly designed or improved design trial prototype, small batch trial production of new products, or the first batch of air hammer products produced after changes in technology or materials , as well as air hammer products undergoing quality grade assessment and performance testing, the noise sound pressure level should be measured, and it is recommended to measure the noise sound power level.
A2 For normal mass-produced air hammer products, only the noise sound pressure level can be measured during factory inspection.
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