A method for predicting the length of burrs in fiber-reinforced composites with fillet tools

Abstract

The invention discloses a method for predicting the burr length of a fiber-reinforced composite material processed by a fillet cutter, and belongs to the technical field of composite material processing. In the implementation process of this method, the geometric dimension and shape profile data of the fillet tool are firstly measured and the tool-workpiece profile geometric model is established. The fiber direction angle θ is used to establish the geometric model of the interaction between the tool fillet and the unbroken fiber in the fiber arrangement plane, and on this basis, the first fracture position of the unbroken fiber is solved and the maximum theoretical burr length is calculated. According to the burr generation mechanism of the fiber reinforced composite material, the method establishes a burr length prediction model during the processing of the fiber reinforced composite material, and the method involves comprehensive and complete content and is easy to operate.

Description

technical field [0001] The invention belongs to the technical field of composite material processing, in particular to a method for predicting the length of burrs in fiber-reinforced composite materials processed by fillet cutters. Background technique [0002] Composite materials are made of two or more materials, which can combine the advantages of several materials to obtain new materials that cannot be obtained by a single material. They have the advantages of specific strength, high specific stiffness and high temperature resistance. They are used in aerospace , energy, chemical and other fields have been widely used. Fiber-reinforced composite material is a typical composite material, with fiber as the reinforcing phase and metal, ceramic or polymer resin as the matrix phase, it is a widely used composite material. [0003] Fiber-reinforced composite materials have typical anisotropy, and the mechanical properties vary greatly in different directions. Usually, the fib...

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Problems solved by technology

Due to the anisotropy of the composite material and the low strength of the fiber-matrix interface, the reinforcement phase and the matrix phase are removed alternately during the processing, and the removal process is unstable, and problems such as severe tool wear and machined surface defects are prone to occur, seriously affecting Processing cost, service performance and service life of components

[0004] In order to increase the strength of the tool and improve the tool life, a rounded corner is often added to the end face of the tool. Although this measure can improve the tool life to a certain extent, it cannot suppress the surface defects of the processed composite material. The burr defect is a typical one. Processing defects, the mechanism of which is that the fiber deforms the knife under the action of the cutting force during the processing without breaking, protruding from the processing surface

Currently there are models related to burr size prediction, such as Hintze W, Hartmann D, Schütte C. Occurrence and propagation of delamination during the machining of carbon fiber reinforced plastics (CFRPs)–An experimental study [J]. Composites Science and Technology, 2011, 71(15):1719-1726. And literature Hintze W, Brügmann F.Influence of curved workpiece contours on delamination during end milling of FRP[J].Procedia CIRP,2017,62:62-67. But the above model only considers the tool When the axis is perpendicular to the fiber arrangement surface, the model is not applicable when the tool axis is parallel to the fiber arrangement surface

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