Method for calculating instantaneous milling force of carbon fiber reinforced composite material by considering changes of fiber cutting angle and cutting depth

Abstract

The invention discloses a method for calculating instantaneous milling force of a carbon fiber reinforced composite material by considering changes of a fiber cutting angle and a cutting depth. The method comprises the following steps: firstly, simulating cutting processes with different fiber cutting angles and different cutting depths to acquire a data sample about cutting force, substituting the acquired data sample into an agent model, and establishing a prediction model in which input variables are the fiber cutting angle and cutting depth and output variables are the cutting force, so that the cutting force under other different fiber cutting angles and cutting depths can be predicted. When the instantaneous milling force is calculated, each instantaneous spiral milling cutter cutting edge is dispersed into a plurality of infinitesimal elements along the circumferential direction of the spiral milling cutter cutting edge; the infinitesimal cutting process is approximately regarded as a right-angle cutting process or an oblique-angle cutting process; the cutting force of each section of infinitesimal element is independently calculated according to different fiber cutting angles and cutting depths of the position where each section of infinitesimal element is located; and finally the cutting force of all the infinitesimal elements is added through a coordinate transformation and vector superposition method, so that the milling force of each moment is calculated.

Description

technical field [0001] The invention belongs to the technical field of mechanical cutting, and relates to a calculation method for instantaneous milling force of carbon fiber reinforced composite materials in consideration of changes in fiber cutting angle and cutting depth. Background technique [0002] Carbon fiber reinforced composite materials have many advantages such as high specific strength, high specific stiffness and strong corrosion resistance, and their application range is more and more extensive. After carbon fiber reinforced composite components are formed, in order to meet the assembly requirements, they often need to be cut twice. However, after the cutting process is completed, the cutting surface of the workpiece may have machining defects, such as delamination, burrs and other defects. At present, people often use the trial cutting method and empirical method to predict the processing quality of composite components. Trial cutting is not allowed for some...

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Problems solved by technology

[0004] Although many literatures have predicted and explored the milling force of CFRP, they did not consider the difference in fiber cutting angle and depth of cut in different regions along the circumferential direction during milling, and most of the studies were on the average milling force. For prediction, the cycle change curve of milling force cannot be obtained

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