Efeito de diferentes estratégias de fresamento sobre a qualidade de superfícies especulares em aços ferramenta
Resumen
The importance of the plastics industry and the use of this type of material for the most
diverse purposes to the development of steel alloys for the manufacturing of injection
molds. Mold manufacturing has a direct influence on product delivery time, costs, and
quality, and milling is one of the most relevant processes for its production. Given the
difficulty in machining hardened steels and the geometries commonly observed in
injection molds, besides the necessary surface quality to generate plastic parts without
defects, an adequate milling strategy must be chosen, which implies in defining not
only the cutting parameters and the tool, but also its trajectory. Thus, the present work
focuses on investigating the influence of two different cutting strategies in milling
process on the surface quality of convex (constant curvature) surfaces on two types of
material. The quality will be evaluated from the different roughness parameters
correlated to the quality of the perceived gloss and will be evaluated and be correlated
to the characteristics of each material, such as hardness and microstructure. After the
tests, in the finishing step it was possible to verify the positive influence of the parallel
strategy obtaining the lowest values of average roughness Sa and maximum Sz in both
steel alloys VH13IM and VTMPlus in comparison with the zig-zag strategy. Those
results were congruent with the generated images from the machined surfaces by the
finishing step. The combination of low roughness values with a homogeneous
topographic profile of the surface led to a higher brightness and mirror finish.
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