Flutter stability prediction method for milled carbon fiber laminates

Abstract

The invention provides a method for predicting the flutter stability of a milled carbon fiber laminate. The method comprises the steps that firstly, an average milling method is adopted, milling forceis obtained through linear fitting of milling experiments with different feeding amounts, and the milling force coefficient of a carbon fiber laminate is recognized; then based on the regenerative chatter theory, a diamond coating flat-end milling cutter is adopted, and a milled carbon fiber laminate dynamical model is built; and finally, a tool modal parameter obtained through a hammering experiment is adopted as an initial condition, a milling dynamics differential equation is solved on the frequency domain, and the milling stability judgment criterion related to the machining parameter relation between the main shaft speed and the axial cutting depth is obtained. According to the method, a machining parameter can be reasonably selected, and vibration of milling machining is effectively avoided; and the workpiece surface quality is improved, tool abrasion is reduced, and a carbon fiber composite milling process method is optimized.

Description

Technical field [0001] The invention relates to the field of composite material machining, in particular to a method for predicting the flutter stability of milled carbon fiber laminates. Background technique [0002] Composite products are widely used in many fields such as aerospace, automobile, electronic and electrical, fitness equipment, etc. due to their unique characteristics of high strength, high modulus, and light weight. The most representative composite materials include glass fiber Composite materials, carbon fiber composite materials, aramid fiber composite materials and ductile epoxy resin composite materials, etc., after molding, most of these products need to be mechanically processed to obtain the required dimensional accuracy, but because the composite materials have high hardness, high strength, and thermal conductivity The characteristics of poor performance and anisotropy can easily produce defects such as delamination, tearing, burrs, wire drawing, and chip...

AI Technical Summary

Problems solved by technology

[0002] Composite material products are widely used in many fields such as aerospace, automobile, electronic and electrical, fitness equipment, etc. due to their unique high strength, high modulus, light weight and other excellent characteristics. The most representative composite materials include glass fiber Composite materials, carbon fiber composite materials, aramid fiber composite materials, and tough epoxy resin composite materials, etc., most of these products need to be machined to obtain the required dimensional accuracy after molding, but because composite materials have high hardness, high strength, and thermal conductivity Poor properties, anisotropy, etc., are prone to defects such as delamination, tearing, burrs, wire drawing, and collapse during processing, which will lead to a decrease in product mechanics and performance. It is a typical difficult-to-process material.

In the actual processing process, chatter is a common phenomenon of bad machining, and it is also the main factor affecting the machining accuracy of the workpiece. Chatter not only affects the surface quality of the workpiece, but also accelerates the wear of the tool, and even affects the life of the machine tool.

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