Автор: Pavlin Vitchev
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- EQUIVALENT SOUND PRESSURE LEVELS IN WOODWORKING MILLING MACHINES
Equivalent continuous sound pressure level LAeq is the main variable characterizing the physiological effects of noise on humans. The technological equipment for woodworking and furniture industry includes the woodworking milling machines, which at the same time are characterized with high levels of noise emissions.
The current study investigates the changes in equivalent sound pressure level measured at workplace during milling of details from common beech wood (Fagus Sylvatika L). The influence of the construction and rotational speed of the cutting tool have been studied.
It was found that depending on the cutting speed and the construction characteristics of the cutting tool, the equivalent sound pressure level LAeq for eight hour working day varies from 74 dB(A) tо 89 dB(A).
Ключови думи: noise, sound emission, equivalent level, noise during milling
- STUDY ON THE POWER – ENERGETIC INDICATORS OF A UNIVERSAL MILLING MACHINE
Experimental studies during milling of solid wood were carried out. The current study was performed at the Laboratory of Woodworking Machinery, University of Forestry, Sofia. The measurements were carried out using universal milling machine FD – 3 (ZDM – Plovdiv). The correlations between fundamental factors influencing the milling process and target functions, such as cutting force and power, specific cutting work, specific power consumption have been investigated. On the basis of the analysis of the obtained results, practical recommendations have been proposed.
Ключови думи: universal milling machine, cutting power, cutting force, specific cutting work, wood milling