This standard specifies the noise limits for the sound power level and sound pressure level of double-disc friction presses. This standard applies to double disc friction presses. Friction brick presses can also be used as a reference. JB 9977-1999 Noise limit for double disc friction press JB9977-1999 Standard download and decompression password: www.bzxz.net

ICS 25.120.01
J62
JB
Machinery Industry Standard of the People's Republic of China
JB9977-1999
Double Disc Friction Press
Released on 1999-05-14
National Machinery Industry BureaubZxz.net
Noise limit
Implemented on 2000-01-01
Released
JB 99771999||tt ||Foreword
Revision of Noise Limits for Straight Double Disc Mopping Presses. This sample standard is basically consistent with the technical content of ZBJ62006.11-89 "Forging Machinery Noise Limit Standard" and has only been re-edited in accordance with relevant regulations. This standard will be implemented from January 1, 2000. This standard replaces ZBJ62006.11-89 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: Liaoyang Forging Machine Tool Factory. The main drafters of this standard: Xu Guangwang, Sun Hongliang, and Bai Sujun. This standard was first published in March 1989.
Fantasy diagram
Machinery Industry Standard of the People's Republic of China
Double-disc friction press
Noise limit
This standard specifies the double-disc friction press noise limits for sound power level and sound pressure level. This standard applies to double-disc friction presses. Friction brick presses can also be used as a reference. 2 Reference standards
JB 9977—1999
replaces ZB J62006.11-89
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. 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/T3623-1984 Forging Machinery Noise Measurement Method 3 Noise Limits
The noise A-weighted sound power level Lw of the double-disc friction press at the specified specifications and the noise A-weighted sound pressure level L at the specified position It should not be greater than that specified in Table 1.
Table 1
Nominal force
kN
Sound power level Lw
dB(A)
Sound pressure level L,|| tt||dB(A)
Measurement method
≤630
87
73
>630~1000
92|| tt||77
4.1 The measurement method of this standard should be in accordance with the provisions of JB/T3623. >1000~1600
94
80
>1600~3150
98
82
4.2 should be used in double disc friction press Measure the noise when the slider moves upward from the lowest position. Instructions for use
The instructions for use of this standard are shown in Appendix A (the appendix of the standard). Approved by the State Machinery Industry Bureau on 1999-05-14>3150~6300
101
85
>6300
90
Implemented on 2000-01-01
1
JB99771999
Appendix A
(Standard appendix)
Instructions for use of this standard
Any new or improved design Trial prototypes, small batch trial production of new products, or the first batch of double-disc A1
friction press products produced after changes in processes and materials, as well as double-disc friction press products for 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 batch-produced double-disc friction press products, only the noise sound pressure level can be measured during factory inspection. 2
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