Foreword This standard is an amendment to ZB J62 006.5-87 [Noise Limits for Forging Machine Noise Limits, and Noise Limits for Small and Medium Three-roll Bending Machines". This standard and the technical content of ZB J62 006.5-87 are basically the same, only in accordance with the relevant provisions of the re-edited, and the standard name was changed to "Bending Machine, three roll bending machine noise limits." This standard has been implemented since January 1, 2000. This standard replaces ZB J62 006.5-87 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: Changzhi Forging Machine Tool Plant. This standard was first released in April 1987. 1 Scope This standard specifies the noise limits for the sound power level and sound pressure level of benders and three-roll bending machines. This standard applies to pipe bending machines and three-roller coiling machines. 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 Measuring method of forging machine noise 3 Noise limit value of pipe bending machine 3.1 The noise level A sound power level LWA when the pipe bending machine is continuously running is not to be greater than that specified in Table 1.
3.2 The noise level A sound pressure level LpA at the specified position when the pipe bending machine is continuously running is not to be greater than that specified in Table 2.
4 Noise limit of three-roller coiling machine 4.1 The noise power level LwA of the noise-weighted A-weighted sound power level of the symmetrical and downward-moving three-roll bending machine shall not exceed the requirements in Table 3.
4.2 The noise-weighted sound power level LWA of the asymmetric three-roll coiling machine during continuous operation shall not be greater than that specified in Table 4.
4.3 The noise-weighted sound pressure level LpA at the specified position when the three-roller coiler is continuously running is not to be greater than that specified in Table 5.
4.4 The noise limits of other specifications of the three-roll bending machine not included in the table shall comply with the noise limit values of the larger one-piece specifications in the table.
5 Measurement methods
The measurement method of this standard shall be in accordance with the provisions of JB/T 3623.
6 Instructions for use Refer to Appendix A (appendix of the standard) for instructions on the use of this standard.
Appendix A
(standard appendix)
The instructions for the use of this standard A1 Any newly designed or modified prototype, a small batch of trial-produced new products, or the first batch of benders, three-roller coiling machines produced after the process or material is changed, and quality rankings The sound pressure level of the noise shall be determined for the bending test machine and the three-roll bending machine of performance test. It is recommended to measure the sound power level of the noise.
A2 Normally mass-produced tube bending machines and three-roll bending machine products can only measure the noise sound pressure level at the time of factory inspection.
