GB 24388-2009Noise limits for press brake and flanging machine (English PDF)

3.1.1 Plate bending machine sound power level limits

Plate bending machine during continuous idling noise A-weighted sound power level LWA shall not exceed specified in Table 1.

Table 1

Plate bending machine Transmission Nominal force/kN limit sound power level LWA/dB (A) Mechanical transmission <=630 100 > 630 ~ 2500110 Hydraulic transmission <=630 95 > 630 ~ 2500100 > 2500105

3.1.2 Plate bending machine sound pressure level limit

Table 2

Mechanical transmission <=630 85 > 630 ~ 250 090 Hydraulic transmission <=630 82 > 630 ~ 250 085 > 250 088 Impulse noise 3.1.3 plate bending machine SPL Specified in Table 3.

Table 3

<=630 95

> 630 ~ 2500100

Noise limits 3.2 hemming machine

3.2.1 Flap machine sound power level limits

Folding machine during continuous idling noise A-weighted sound power level LWA shall not exceed the table 4.

Table 4

The number of swings folding beam can be folded thickness/mm sound power level limit value LWA/dB (A) <=4 <=2.5 95 > 102 2.5 > 4 <=2.5 98 > 105 2.5

3.2.2 Flap machine sound pressure level limit

Table 5

<=2.5 82

> 2.5 86

<=2.5 84

> 2.5 88

3.2.3 Impulse noise folding machine SPL

Table 6

<=2.5 92

> 2.5 96

<=2.5 94

> 2.5 98

4.1 SPL Measurement

Noise level measurement method presses shall comply GB/T 23281-2009 of.

4.2 Sound power level measurement

Sound power level measurement of the press shall comply with GB/T 23282-2009 of.

4.3 Noise Measurement Description

4.3.1 factory test only measures the noise level.

4.3.2 The new design or improve the design, technology, materials, new products after the noise level should be measured during the performance test; can also be measured Sound power level to the noise level of conformity assessment basis.