This standard specifies the noise limits of sound power level and sound pressure level of punching and shearing machines and combined punching and shearing machines. This standard applies to punching and shearing machines and combined punching and shearing machines. JB 9970-1999 Noise limits of punching and shearing machines and combined punching and shearing machines JB9970-1999 Standard download decompression password: www.bzxz.net

IL 3 25.120.01
Machinery Industry Standard of the People's Republic of China
JB9970-1999
Punching and shearing machines, combined punching and shearing machines
Noise limits
1999-05-14 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB9970-1999
This standard is a revision of ZBJ62006.4-87 "Noise limits for light pressure machinery - Punching and shearing machines, combined punching and shearing machines". The technical contents of this standard are basically consistent with those of ZBJ62006.4-87, and it has only been re-opened in accordance with relevant regulations. This standard shall be implemented from January 1, 2000, and this standard shall replace ZBJ62006.4-87 from the date of implementation. ，Appendix A of the standard is the appendix of the standard.
This standard was proposed by the National Standardization Technical Committee of Pressing Machinery, and the drafting unit of this standard is: Zhaolong Forging Machine Factory. This standard was first issued in April 1987.
! Scope
Machinery Industry Standard of the People's Republic of China
Punching and shearing machine, combined punching and shearing machine
Noise limit
This standard specifies the noise level and noise level of punching and shearing machine and combined punching and shearing machine. The standard is applicable to punching and shearing machine and combined punching and shearing machine. 2 Reference standards
JB997n-1999
Search 213162006.487
The following standards contain provisions that are regarded as standard provisions by reference in this standard: When this standard is published, the versions shown are all valid. All standards will be revised. All parties using this standard should consider the possibility of using the latest version of the following standards: B.T3623-1984 Forging Machine City Measurement Method 3 Noise Value of Punch-type Shearing Machine
3.1 The A-weighted sound power level L of the end sound of the punch-type shearing machine when it is running empty should not be greater than 4dB (A). 3.2 The A-weighted sound power level L of the punch-type shearing machine when it is running empty at the specified position should not be greater than (A). 4 Noise limits for combined punching machines
4.1 The noise level of a combined punching and shearing machine during continuous idling should not be greater than the specified value in Table 1
Acoustic power flow
-10-15
>16-2:bZxz.net
The noise level of a combined punching and shearing machine during continuous idling should not be greater than the specified value in Table 2, Table 2
Approved by the National Machinery Industry Bureau on 1999-5-14
>16-25
Implemented on 2000-01-01
Measurement method
JB 9970-1999
The test square of this standard is in accordance with the current provisions of 33623: Instructions for use
The instructions for use of this standard are shown in Appendix A (Appendix to the standard) JB 9970-199
(Appendix to the standard)
Instructions for use of this standard
A1 All trial prototypes of new or improved designs, new products of small trial production, or the first production after process and material changes. Punching and shearing machine combined punching and shearing machine products that are subject to quality grade assessment and performance tests shall be measured according to the recommended production pressure level: A2 For normal batch production of punching and shearing machines, combined punching and shearing machine products, the noise level can be measured during the inspection.
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