Hyd-Mech S-20DS, Руководство по эксплуатации и обслуживанию, Страница: 26 / 138

3--8 20
Use and maintenance manual S--20DS
Noise level of the machine
Noise can cause hearing damage and represents one the problems faced by many
countries who adopt their own standards. In accordance with the EEC MA-
CHINES DIRECTIVE 98/37/CE , we are listing the standards that specify noise
levels for machine tools. This chapter also reports the noise levels produced by
the S---20DS during its various operating phases and the methods used for
measuring these levels. The Italian standard governing this aspect is
D.M.n.277/91 drawn from EEC Directives 80/1107, 82/605, 83/477, 86/188, 88/642.
Noise level measurement
Noise levels are measured using an instrument known as an Integrator noise---
meter which registers the equivalent continuous acoustic pressure level at the
work station.The damage caused by noise depends on three parameters: level,
frequency and duration. The equivalent level concept Leq combines the three
parameters and supplies just one indication. The Leq is based on the principle of
equal energy, and represents the continuous stationary level containing the same
amount of energy, expressed in dBA, as that actually fluctuating over the same
period of time.This calculation is made automatically by the integrator noise---
meter. The measurements are taken every 60 seconds, in order to obtain a
stabilised value. The reading stays on the display for a sufficient time to enable a
reading to be taken by the operator.Measurements are taken by holding the
instrument at approximately 1 metre from the machine at a height of 1.60 metres
above the platform at the operator’s work station.
Two measurements are taken: the first while the machine operates without cutting
anything, the second while cutting in manual mode.
Noise level values
Identification
Machine type Band saw for metal applications
Model
S---20DS
Reference standard ISO 3746
Results
Description
C53 steel cut --- pipe 356 x 286 mm
Bimetal band 4500 x 27 x 0,9
Test 1st0
Results
Mean sound level (Leq) 71,00 dB (A)
Environmental correction (K) 3,76 dB(A)
Peak sound power (Lw) 81,93 dB(A)
Descriprion
C 40 steel cut --- HPE 400 x 300 mm
Bimetal band 4500 x 27 x 0,9
Test 2nd
Results
Mean sound level (Leq) 68,92 dB(A)
Environmental correction (K) 3,76 dB(A)
Peak sound power (Lw) 81,90 dB(A)
Description
34CND6 material cut ---pipe Ø 150 mm
Bimetal band 4500 x 27 x 0,9
Test 3rd
Results
Mean sound level (Leq) 69,07 dB(A)
Environmental correction (K) 3,76 dB(A)
Peak sound power (Lw) 79,78 dB(A)