THERMAL CHARACTERIZATION OF HARDMETAL BY OPEN PHOTOACOUSTIC CELL TECHNIQUE

Aldo Braghini Junior, Daniele Dias, Juliana Sousa, Regiane Gordia Drabeski
  • January 2017, Associacao Brasileira de Engenharia e Ciencias Mecanicas - ABCM
  • DOI: 10.26678/abcm.cobem2017.cob17-0352

Thermal diffusivity measurements of commercial hardmetal by OPC technique.

What is it about?

In the present work, the open photoacoustic cell technique was used to measure the thermal diffusivity of commercial hardmetal used as metal-cutting tool in the process called dry machining. The inserts from different manufacturers both used in milling of steel were named X and Y. The average value found for the X and Y samples were (19.4 ± 0.7) x10-6 m2/s and (26.3 ± 0.9) x10-6 m2/s respectively. These results agree with the values of the literatures where same and other techniques have been employed for several sintered WC/Co hardmetal. In addition, the microstructural characterization of samples was done by X-ray diffraction and scanning electron microscopy.

Why is it important?

This is of great importance, because the metal cutting tool requires good thermal properties due to the tool flank wear – abrasion and friction.

Perspectives

Professor Daniele T Dias (Author)
Federal University of Technology - Paraná

The OPC technique was able to give thermal diffusivity measurements for commercial hardmetal inserts used in the milling process and made it possible to study the way heat is diffused in the samples. The values present results lower than the reference ones, due to low amount of Co. The heat propagation velocity is higher for the Y hardmetal sample. It was observed that the hardmetal of different manufacturers showed similarities in their chemical components. On the other hand, the Y hardmetal sample had a finer microstructure, and little growth of WC-Co grains and so higher thermal diffusivity. In this case, we suggest that the higher thermal diffusivity is desirable to increase the useful life of the tool. Future measurements should be made with respect to cutting rate.

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http://dx.doi.org/10.26678/abcm.cobem2017.cob17-0352

The following have contributed to this page: Professor Daniele T Dias