Production noise on an automated molding line in a foundry

Abstract

The purpose of the work is to determine the nature of the noise generated during the operation of manual pneumatic rammers, an automated molding line and knockout grids in the foundry shop based on determining the levels of acoustic noise parameters in the mold manufacturing area and ways to reduce their level. To determine the noise parameters, a mode noise spectrum analyzer SL-5868F was used with subsequent digitization of the data obtained on the analyzer. Measurements of noise parameters were carried out at the site for the production of foundry molds with manual pneumatic rammers and an automatic molding line, as well as at the site for knocking out castings on knockout grids. It has been established that the noise generated in the areas of molding and knocking out molds, regardless of the molding method (manual, automatic) and the model of the knockout grid used, is broadband, and there is no homogeneity in the sound field of the generated noise, which is due to the generation of noise from sources characterized by differences in acoustic power levels and the nature of the noise spectrum. The noise from equipment or a technological operation with a shock nature is not constant and has a maximum sound power level in the region of medium and high frequencies generated by the equipment under study. It is possible to reduce the noise level in the foundry shop analyzed in the work by implementing a set of measures to modernize the molding and knocking out equipment or introducing into production an alternative method of manufacturing and knocking out foundry molds, in which, if it is possible to produce castings of a given nomenclature in the required volume with the required level of quality, the above mentioned are excluded and other sources of noise generation of unacceptable levels.