LOW-COST PIEZOELECTRIC TRANSDUCER APPLIED TO WORKPIECE SURFACE MONITORING IN GRINDING PROCESS
Danilo Marcus Santos Ribeiro1; Marcelo Marchi1; Pedro de Oliveira Conceição Junior1; Rafael Dourado Sodário1; Paulo Roberto de Aguiar1; Eduardo Carlos Bianchi2
1 Universidade Estadual Paulista - UNESP, Faculdade de Engenharia, Campus Bauru, Departamento de Enge; 2 Universidade Estadual Paulista - UNESP, Faculdade de Engenharia, Campus Bauru, Departamento de Eng
doi:10.20906/CPS/COB-2015-0257
Resumo
Grinding is a precision finishing process widely used, which has great importance in the industry. Low surface roughness values and a high level of the workpiece surface are expected in this process. However, there are many variables involved in the process, which makes the process monitoring an important aspect to be approached. The objective of this paper is to analyze the workpiece surface with regard to its surface roughness and burn occurrence by using low-cost piezoelectric transducer. To perform this work, workpieces of SAE 1045 steel were used with aluminum oxide grinding wheel in a surface grinding machine. The tests consisted of grinding ten workpieces with different depths of cut, maintaining the other grinding parameters constant. A passive piezoelectric transducer was fixed in the workpiece support, and the signals were collected by an oscilloscope with a sampling rate of 2 million samples per second. Digital signal processing techniques such as digital filters and discrete Fourier transform were used for the extraction of characteristics related to indicative parameters of the surface quality of the workpiece. The results showed a strong correlation between the characteristics extracted from the collected signals, the behavior of the surface roughness of the workpieces and the burn occurrence. Therefore, it can be concluded that the workpiece surface monitoring by the piezoelectric transducer is an efficient alternative when compared to the common methods of monitoring.
Palavras-chave: Grinding; Piezoelectric Transducer; Roughness; Burn; Monitoring