JB 9975-1999 This standard is a revision of ZB J62 006.9-88 "Noise Limits of Forging Machinery Noise Limits of Automatic Upsetting Machines, Automatic Trimming Machines, Automatic Thread Rolling Machines, and Automatic Bending Machines". This standard specifies the noise limits for sound power levels and sound pressure levels of automatic upsetting machines, automatic trimming machines, automatic thread rolling machines, and automatic bending machines. This standard applies to automatic upsetting machines, automatic trimming machines, automatic thread rolling machines and automatic bending machines. This standard was first published in April 1988. JB 9975-1999 Noise limits for automatic upsetting machines, automatic trimming machines, automatic thread rolling machines, and automatic bending machines JB9975-1999 Standard download and decompression password: www.bzxz.net

ICS25.120.01
J62
JB
Machinery Industry Standard of the People's Republic of China
JB9975-1999
Automatic forging machine, automatic trimming machine,|| tt||Automatic thread rolling machine, automatic bending machine
Noise limit
Released on 1999-05-14
National Machinery Industry Bureau
Released
2000-01-01 Implementation
JB9975-1999
Foreword
This standard is a compilation of ZBJ62006.9--88 "Forging Machinery Noise Limits Automatic Forging Machines and Automatic Trimming Machines" , Revision of Noise Limits for Automatic Thread Rolling Machines and Automatic Bending Machines. The technical content of this standard is basically the same as that of ZBJ62006.9-88, and has only been re-edited in accordance with relevant regulations.
This standard will be implemented from January 1, 2000. This standard replaces ZBJ62006.9-88 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. This standard was drafted by: Huangshi Forging Machine Tool Factory. This standard was first published in April 1988.
Fan Guo
Machine Industry Standard of the People's Republic of China
Automatic upsetting machine, automatic trimming machine,
Automatic thread rolling machine, automatic bending machine||tt| |Noise limit
JB 9975-1999
Replaces ZBJ62006.9-88
This standard specifies automatic forging machines, automatic trimming machines, automatic thread rolling machines, and automatic bending The noise limits of the sound power level and sound pressure level of the machine.
This standard applies to automatic forging machines, automatic trimming machines, automatic thread rolling machines and automatic bending machines. 2 Referenced standards
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
3.1 The noise A-weighted sound power level L of the automatic forging machine during continuous idling operation must be equal to the noise A-weighted sound pressure level at the specified position L should not be greater than the requirements in Table 1.
3.2 The noise A-weighted sound power level Lw of the automatic trimming machine and the automatic thread rolling machine during continuous idling operation and the noise A-weighted sound pressure level L at the specified position should not be greater than those specified in Table 2.
3.3 The noise A-weighted sound power level L of the automatic bending machine during continuous idling operation and the noise A-weighted sound pressure level L at the specified position should not be greater than those specified in Table 3.
National Machinery Industry Bureau approved 2000-01-01 implementation on 1999-05-14
2
Machine name
Double-click the whole mold
Cold forging machine
Nut automatic
Forging machine
Multi-station
Cold forming machine
Bolt automatic
Cold locking machine·||tt ||Steel ball cold forging machine
JB 9975—1999
Table 1
Main parameters and specifications of the machine
≤4
Part rod Maximum diameter of the nut
mm
Maximum diameter of the nut thread
mm
Nominal working forcebZxz.net
kN
Maximum diameter of the processed thread|| tt||mm
Parts volume and large diameter
mm
1) Including automatic bolt making machines with chamfering and thread rolling mechanisms. Machine name
Automatic trimming machine
Automatic thread rolling machine
Machine name
Automatic bending machine
>4-6
> 6~12
>12
≤8
>8~16
>16
≤2000
>2000||tt ||≤8
>816
>16
≤16
>16
Table 2
Main parameters and specifications of the machine
Maximum diameter of part rod
mm
Maximum diameter of thread processing
mm
$10
>10-16||tt ||>16
6
>6-12
>12
Table 3
Main parameters and specifications of the machine
Nominal Force
kN
≤16
>16
Sound power level L
dB(A)
96
100
102
104
100
103
105
105
108
100| |tt||103
105
103
105
Sound power level Lw
dB(A)
100||tt ||103
105
98
100
104
Sound power level Lwa
dB(A)
95
98
Sound pressure level Lp
dB(A)
81
84
86
88| |tt||85
87
89
87
89
85
87
89||tt ||87
89
Sound pressure level Lk
dB(A)
85
87
89
83
85
88
Sound pressure level Lg
dB(A)
80
85
5| |tt||Measurement method
JB9975—1999
The measurement method of this standard should be in accordance with the provisions of JB/T3623. Instructions for use
Instructions for use of this standard are shown in Appendix A (Standard Appendix) JB 9975-1999
Appendix A
(Standard Appendix)
Appendix Name|| tt | Wire machines, automatic bending machine products, as well as automatic forging machines, automatic trimming machines, automatic thread rolling machines, and automatic bending machine products for quality grade assessment and performance testing should all have their noise sound pressure levels measured. It is recommended to measure the noise sound pressure level. power level. A2 For normal mass-produced automatic forging machines, automatic trimming machines, automatic thread rolling machines, and automatic bending machine products, only the noise sound pressure level can be measured during factory inspection.
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