FIGURE 11.3 Number of studies on micromilling by years

Variants of high speed machining
Chapter | 11

291
Although scientific research has been conducted on the micromilling method for almost 40 years, it has improved the understanding of phenomena over the last 10 years and the development of machine tools and tools with the development of technology. In this method, better outcomes are achieved with grain and grain size and homogeneous materials. The multiphase materials are an additional difficulty in the properties of the phases, for example, because of the different types of pearlite and ferritin in steels. The emergence of mi- crograin tungsten carbide tools has contributed significantly to the advancement of the microsegment through the fabrication of tools having a shorter edge radius and accordingly allows the usage of lower uncut chip thickness values (lower feed rates).
There are low microcutting forces due to the small cutting area, but a significant increase occurs in the special cutting force with a decrease in the uncut chip thickness due to proper cutting. The use of laser or vibration-assisted mi- cromilling for the purpose of decreasing the shear strength of the work material ensures that the tool life behavior becomes more consistent. On the contrary, the quality of the processed surface maybe impaired by laser-supported mi- cromilling. Concerning the quality of the processed component, burr formation represents the most important feature because burr values are not lower than the values in conventional processing. Numerous efforts have been made for the purpose of preventing or minimizing the formation of burrs, the basis of many of which constitutes the choice of the best cutting parameters. AE represents the main method, which is utilized for monitoring micromilling that offers many advantages over the monitoring of force and vibration signals. Particular attention was given to predicting tool failure, surface formation, and the formation of

Download 0.88 Mb.

Share with your friends: