Abstract
ABSTRACT This study evaluated the influence of thermal rectification in machining Corymbia citriodora and Pinus elliottii. The heat treatment was carried out for 6 hours at temperatures of 100°C, 140°C, 160°C, 180°C and 200°C and evaluated the performance of machining in three different material cutting tools, polished and hard metal carbide with TiB2 coating. The cutting power and roughness Ra and Rt of the machined surfaces with three different tools were evaluated. The power has proven lower for Pinus elliottii species. The roughness was lower for Corymbia citriodora wood. The roughness Ra and Rt were lower for heat treatment temperature of 180°C.
Highlights
Some technological methods have been used to modify and acquire important properties in forested wood
The roughness Ra depends on the anatomy of wood under study, but it is possible to verify that for Corymbia citriodora wood, the roughness decreases with thermal rectification temperature, because from room temperature to 180°C, it is noted this attenuation, and Ra increased to heat treatment at a temperature of 200°C
Corymbia citriodora wood used more machining power compared to Pinus elliottii wood due to its greater density, which led to higher machining force
Summary
Some technological methods have been used to modify and acquire important properties in forested wood. The thermal rectification has been highly exploited. The wood thermal rectification process consists of subjecting it to temperatures between 100°C and 250°C for certain periods of time, in order that pyrolysis occurs, which involves some physical degradation of wood components such as hemicelluloses, cellulose and lignina. It will allow new properties to the wood, such as color modification, lower water absorption and enhanced resistance to biological degradation (Confederation of Finnish Industries, 2007). The changes occurring in the wood through thermal rectification process confer higher added value to it
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