Method for predicting axial force of whole process of rotary ultrasonic drilling of CFRP/Al laminated structure

Abstract

The invention provides a method for predicting axial force of the whole process of rotary ultrasonic drilling of a CFRP/Al laminated structure. The method comprises the steps that firstly, an axial motion trajectory equation of two main cutting edges is established, and a dynamic drilling thickness in the drilling process and an average drilling thickness in a vibration period are obtained; secondly, the axial force on the main cutting edges and the axial force on a transverse edge are analyzed and calculated, infinitesimal expressions of the axial force on the main cutting edges and the axialforce on the transverse edge during CFRP drilling and infinitesimal expressions of the axial force on the main cutting edges and the axial force on the transverse edge during Al drilling are established correspondingly; and then the drilling whole process is divided into a drilling-in CFRP stage, a stable CFRP drilling stage, a CFRP/Al drilling critical stage, a stable Al drilling stage and a drilling-out Al stage, aiming at machining characteristics of all the stages, axial force prediction models of five stages are established correspondingly, and finally, predicting of the axial force of the whole process of rotary ultrasonic drilling of the CFRP/Al laminated structure is achieved.

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 in the whole process of rotary ultrasonic drilling CFRP / Al laminated structure. 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. Since metal materials cannot be completely replaced at present, a large number of CFRP / metal laminated structures appear in these products, among which CFRP / Al (aluminum) laminated applications are the most common. The CFRP / Al laminated structure needs to be assembled with bolts or rivets, which requires a large number of connection holes to be processed at the connection. In order to improve assembly accuracy and efficiency, the...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that in the existing axial force modeling, the modeling of the axial force of drilling the entire laminated structure is not considered, resulting in inaccurate prediction accuracy, and a rotary ultrasonic drilling CFRP is proposed. Axial force prediction method for the whole process of CFRP / Al laminated structure can improve the accuracy of axial force prediction during rotary ultrasonic drilling of CFRP / Al laminated structure

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