Prediction method of axial force for full-cycle instantaneous drilling of fiber-reinforced composite/metal laminates

Abstract

A fiber reinforced composite / metal lamination complete cycle instantaneous drilling axial force prediction method is characterized by comprising the following steps: 1, determining primary parameters, dividing a twist drill main cutting edge and a transverse edge into infinitely-small micro-units, and resolving secondary parameters; 2, determining a fiber direction angle of a random cutting micro-unit on the main cutting edge in a drilling process; 3, calculating cutting force on the micro-unit when the main cutting edge cuts metal; 4, dividing the lamination drilling process into 5 stages according to the relative states of the cutting edge and the workpiece material at each moment in the drilling process, and determining integration top and bottom limitations of each stage; 5, calculating the complete cycle instantaneous drilling axial force according to a integration formula. The method fully considers influences on the cutting micro-unit by the fiber direction angle, provides the lamination drilling complete cycle five-stage drilling axial force prediction method, and can present lost instantaneous fluctuation information of the lamination composition drilling force.

Description

technical field [0001] The invention relates to a mechanical processing technology, in particular to a cutting force prediction method, in particular to a full-period instantaneous drilling axial force prediction method of a fiber-reinforced composite material / metal laminate. Background technique [0002] In the structure of aerospace vehicles, carbon fiber reinforced composite materials gradually replace some traditional metal materials, forming a large number of composite material / metal laminated structures (hereinafter referred to as laminated structures). The mechanical connection of the laminated structure is the main connection process in the current assembly, which requires the use of twist drills for the processing of prefabricated holes. On the one hand, due to its anisotropy and heterogeneity, composite materials are inherently difficult to process, and are prone to problems such as delamination, tearing, and wear. On the other hand, the drilling process of laminat...

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Problems solved by technology

[0004] The purpose of the present invention is to be able to adapt to the needs of laminated materials for existing drilling and prediction models, therefore directly affects the problem of the decision-making of laminated material drilling process parameters, in order to overcome existing methods when predicting the drilling force of laminated structures Due to the lack of instantaneous fluctuation information, a method for predicting the axial force of twist drills for fiber-reinforced composite materials / metal laminated structures is invented. It fully considers the influence of fiber direction angles on cutting elements, and gives the Prediction Method of Axial Force of Drilling in Five Stages of Full Drilling Cycle

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