关键词: 纤维方向角, 碳纤维增强复合材料, 切削温度, 刚度, 建模

Abstract: To reveal new knowledge of the cutting temperature when cutting carbon fiber reinforced composites (CFRP) under the influence of fiber orientation angle (θ), experimental study on cutting temperature were conducted in orthogonal cutting of CFRP unidirectional laminates. Twelve different angles, from 0 ° to 180 °, were employed in this study. The results show that cutting temperature has strong anisotropy under the influence of θ. Cutting temperature, along the fiber orientation (θ<90 °), is significantly higher than that along the inverse fiber orientation (θ> 90 °) and the maximum cutting temperature is reached when using θ= 90 °. Most of the cutting heat, generated in the first and second deformation zone, has been taken away by powdered chips. Cutting temperature is mainly contributed by cutting heat generated in the third deformation zone, which is dominated by the resistance towards depth of cut. Cutting temperature was predicted and verified based on the results of the experiment. Using Fourier's law of heat conduction, modeling of cutting temperature was carried out considering the spring-back effect of CFRP unidirectional laminates on the contact length between the flank surface and the workpiece. Fiber orientation angle and the equivalent stiffness, considering the anisotropy of CFRP unidirectional laminates, were introduced into the model. A prediction model for cutting temperature under different fiber orientation angle is established in orthogonally cutting of CFRP unidirectional laminates. The maximum prediction error is less than 5.5%.

Key words: Fiber orientation angle, CFRP, Cutting temperature, Stiffness, Modeling