INFLUENCE OF THE CUTTING MODE ON THE NOISE EMISSION LEVEL DURING LONGITUDINAL-PLANNER MILLING OF LINDEN AND BEECH WOOD
Keywords:
milling; noise; sound pressure level; beech; lindenAbstract
The change in noise emissions generated during longitudinal flat milling of solid wood specimens using a knife shaft with spirally arranged flat knives is investigated in the paper. The influence of the feed rate (Vf) and the thickness of the cut-out layer (h) on the change in the A-weighted sound pressure level in dB(A) was determined. For the purpose of the study, specimens from beech and linden wood with widths (B) of 50, 100 and 150 mm were used. Based on the performed measurements, graphical dependencies illustrating the influence of the investigated factors on the noise emission levels were derived. The results confirmed the predicted influence of the feed rate (Vf) on the changes in the noise emission levels as follows: the Vf increased from 88.3 dB(A) to 92 dB(A) during processing beech wood specimens, and from 87.1 dB(A) to 89.9 dB(A) when processing linden wood specimens. Depending on the thickness of the cut-out layer (h), the sound pressure level varies within the range from 90.5 dB(A) to 97.3 dB(A) when processing beech wood specimens and from 86.2 dB(A) to 88.6 dB(A) for linden wood specimens. For the practical applicability of the obtained results and in order to ensure lower noise emission levels consistent with the maximum permissible sanitary and hygienic standard of 85 dB(A), recommendations for the optimal values of the feed rate (Vf) and the thickness of the cut-out layer (h) were made.
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