This standard is an amendment to ZB J62 006.2-87 "Noise Limit Value for Open-Type Press Noise Limits of Forging Machine Noise Limits". This standard and the technical content of ZB J62 006.2-87 are basically the same, only according to the relevant provisions of the re-editing.
This standard has been implemented since January 1, 2000.
This standard replaces ZB J62 006.2-87 from the date of implementation.
Appendix A of this standard is an appendix to the standard.
This standard was proposed and managed by the National Standardization Technical Committee of Forging Machinery.
This standard is drafted by: Jinan Foundry Forging Machinery Research Institute.
This standard was first released in April 1987.
1 Scope This standard specifies the noise limits for sound pressure levels and sound pressure levels for open presses.
This standard applies to open fixed station presses and open-type tilting presses (hereinafter referred to as presses).
2 Reference Standards The following standards contain provisions that, through reference in this standard, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards will be revised and all parties using this standard should explore the possibility of using the latest version of the following standards.
JB/T 3623-1984 forging machinery noise measurement method
3 Noise limits 3.1 The noise-weighted sound power level LWA of the press during continuous operation shall not be greater than that specified in Table 1. 
3.2 The noise level A sound pressure level LpA at the prescribed position of the press during continuous operation shall not be greater than that specified in Table 2.
3.3 The impulse noise A-weighted sound pressure level LpA1 at a specified position during a single stroke of a no-load press shall not be greater than that specified in Table 3. 
4 Measurement methods
The measurement method of this standard shall be in accordance with the provisions of JB/T 3623.
5 Instructions for use
The use of this standard is described in Appendix A (Appendix of the standard).
Appendix A
(standard appendix)
The instructions for the use of this standard A1 Any newly designed or improved prototype of a prototype, a new batch of trial-produced new products, or the first batch of press products produced after the process or material is changed, and presses for quality rating and performance testing The sound pressure level of the noise should be determined. It is recommended to determine the sound power level of the noise.
A2 Normal mass production presses can only measure the noise sound pressure level at the factory inspection.
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