Análise do acabamento de peças de alumínio torneadas por bits e incertos de metal duro

Abstract

The purpose of this work is to verify the finish through the average roughness of aluminum parts when turned by section square high speed steel bits, which is a tool widely used in workshops, and by T-shaped carbide inserts, because their shape is easily replicable in bit. The main objective is to compare the finish of the parts using a surface roughness tester to obtain the values of deviations along the surface of the part. The depth of cut value for each pass is kept fixed, and the part rotation changes at each step. Both cutting tools have their advantages and disadvantages, the bit can be shaped according to the desired geometry and also sharpen the cutting edge several times, but requires frequent sharpening, which increases the production time, while The insert has a longer service life on each edge, but the price is high compared to the bit, for surface finish, will be studied which of these tools allows a higher quality machining. The choice of aluminum was because it is a high ductility material and has good thermal and mechanical properties. The result is validated by the influence of rotation on roughness and the discussion of other parameters that cause surface defects in the part. In the work it was possible to see that the insert can achieve better results in the surface finish, while the bit until a certain rotation has expected values, but at high rotations the resulting wear such as the appearance of a cutting edge hindered the quality of the finish.