May 24 th - 26 th 2017, Brno, Czech Republic, EU THE INFLUENCE OF CASTING PARAMETERS ON THE SOUND OF A BELL NADOLSKI Maciej 1, CEKUS Dawid 2 1Czestochowa University of Technology, Faculty of Production Engineering and Materials Technology Czestochowa, Poland, EU,
[email protected] 2Czestochowa University of Technology, Faculty of Mechanical Engineering and Computer Science, Czestochowa, Poland, EU,
[email protected] Abstract A comparative analysis of sound emitted by two identical bells cast of bell bronze at different pouring temperatures was carried out. The influence of pouring temperature on the change of sound, the structure, and the porosity of castings was assessed. The obtained results were compared with the simulation results concerning vibration of numerical models received from the SolidWorks program. It was proved that higher pouring temperature results in the reduced porosity of a bell casting with simultaneous improvement in the quality of sound thanks to the revealing of the basic constituents of sound demanded for bells (hum, prime, tierce, nominal). Keywords: Bell, tin bronze, porosity, sound 1. INTRODUCTION People attempted to produce large and small bells using a variety of materials: cast iron, cast steel, zinc and aluminium alloys, glass, china, or pottery. But the alloy consisting of about 80 wt.% of copper and 20 wt.% of tin is still regarded as the basic material for production of bells, the so-called ‘bell bronze’ (UNS C91300). Despite many trials of replacing the costly tin with other elements, no alloy of so good acoustic properties was achieved [1]. The alloy composition, however important, is not the only factor determining alloy properties.