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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.
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.
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