A method for predicting the axial force of carbon fiber composite materials by rotary ultrasonic drilling with three-tip drill

Abstract

The invention provides a three-pointed drill rotary ultrasonic drilling carbon fiber composite axial force forecasting method, which comprises the steps of firstly building and simplifying a drill geometric model based on a unique structural feature of a three-pointed drill; secondly, analyzing axial forces on cutting edges of the three-pointed drill, respectively calculating a relation between differentiation elements of cutting widths on two cutting edges and a differentiation element of a drill radius, and building differential element expressions of the axial forces on the two cutting edges; thirdly, according to a kinematics characteristic of rotary ultrasonic drilling, building a functional expression of a cutting layer thickness and process parameters (including ultrasonic vibrationparameters) under a processing mode; then introducing an uncertain factor coefficient K, and obtaining a mapping relation between the K and the processing parameters through a statistical method; finally, combining an instability coefficient and stable drilling axial force forecasting model for effectively forecasting a three-pointed drill rotary ultrasonic drilling CFRP axial force.

Description

technical field [0001] The invention belongs to the technical field of rotary ultrasonic drilling, in particular to a method for predicting the axial force of a carbon fiber composite material by rotary ultrasonic drilling with a three-tip drill. Background technique [0002] Carbon fiber composites (CFRP for short) are increasingly used in modern manufacturing (such as military aircraft, space shuttles, ships, and automobiles) due to their excellent mechanical properties such as light weight, high specific strength, and high specific stiffness. application. During part machining, a large number of holes need to be drilled in the host material. According to statistics, about 60% of component failures are caused by hole-making defects. Therefore, the quality of hole processing plays a vital role in the performance and service life of the product. However, the excellent mechanical properties of CFRP also bring challenges to the drilling process. The hole-making process of C...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that there is no prediction model suitable for three-point drills in the existing axial force modeling, and proposes a three-point drill rotary ultrasonic drilling CFRP axial force prediction method, which can realize three-point Accurate Prediction of Axial Force in CFRP by Rotary Ultrasonic Drilling with Point Drill

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