Development of a noise-proof cab for small-sized turning equipment

Abstract

The paper considers a project for the development of a noise-proof cab for small-sized turning equipment for metalworking. The lathe MML 1830 V was selected as such an equipment, designed for use in small workshops. The development of collective protection equipment in the form of a noise-proof cab for this class of equipment is an actual problem. It is important owing to the fact of contiguity with dwelling unit in the organization of the working space at the stage of commissioning or works related to modernization. One of the tasks was to reduce the manufacturing costs and materials used in the search for the optimal design complexity to achieve sufficient sound levels in the octave frequency bands stipulated by the sanitary requirements. The concept of soundproofing is realized by the example of the simplest soundproof cabin made of Izolon® material and the Joker system. A noise measuring tool for the purposes of the pilot study was the SPL Meter software. The difference in sound pressure levels in octave bands was determined at different speeds of the lathe chuck at idle. It is established that with increasing rotation speed, the sound level, dBA, also increases, but the difference in sound pressures inside and outside the cabin remains almost the same with the average geometric value of 7.6 dBA. The reached maximum sound level outside the noise-proof cab is 75.6 dBA below the standard value of 80 dBA.