دانلود رایگان مقاله انگلیسی بررسی شکاف مواد فیبرهای پلیمری تقویت شده (CFRP) با استفاده از ابزار مارپیچی - اشپرینگر 2018

Abstract

In the present work, we studied the slotting process of carbon fiber-reinforced plastic (CFRP) material with segmented helix tool. Measurements of transverse and longitudinal surface roughness, cutting efforts, and consumed power are carried out for different combinations of cutting speed and feed per tooth in order to evaluate the influence of the cutting conditions on the machined surface quality and energy consumption. Transverse (correspondingly longitudinal) roughness refers to roughness measured perpendicular to the advance direction (correspondingly in the advance direction). Scanning electron microscope (SEM) images have been taken in order to see closely surface topography and damages that occur to the machined surface. From the results, it was found that longitudinal roughness values depend on cutting conditions which is not the case for the transverse roughness and feed per tooth makes the highest statistical and physical influence on surface roughness, cutting force, and the consumed power values. SEM images showed the presence of four different material removal mechanisms that can cause damage to the matrix or/and fibers and may generate an increase in roughness measurements.

5 Conclusion

The work focuses on measurements of surface roughness, cutting efforts, and cutting power during slotting of CFRP material referenced G803/914 with segmented helix tool. The correlation of cutting conditions, tool geometry, and machined surface was examined in order to have an idea about what is happening in the contact area tool/workpiece. Based on the presented results, the following conclusions are drawn:

1. Transverse roughness criteria (Rat, Rzt, Ryt, and Rqt) have the same trend of evolution, they do not depend on cutting conditions: it is sufficient to study a single parameter in order to describe CFRP machined surface quality in the transverse direction.

2. Longitudinal roughness criteria (Ral, Rzt, Ryt, and Rql) depend on cutting conditions: the average roughness and the root-mean square height parameters are less sensitive to surface changes than the maximum peak-to-valley height and the 10-point height in the longitudinal direction: it is not sufficient to study single parameter in order to describe the surface profile in the longitudinal direction (Ryl and Rzl are better than Ral and Rql). Moreover, longitudinal roughness in up milling is lower than that in down milling.

3. Eqs. 3–10 obtained can be effectively used to evaluate the slotted CFRP surface roughness with the segmented helix tool. Feed per tooth presents the highest statistic