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A method for predicting the exit burr height of robotic rotary ultrasonic drilling cfrp/aluminum alloy laminated structure

A technology of rotating ultrasonic and aluminum alloys, which is applied in the directions of instruments, design optimization/simulation, computer-aided design, etc., can solve the problems of inaccurate prediction accuracy, failure to take into account the weak stiffness characteristics of robots and ultrasonic vibration characteristics, etc., and achieve improved prediction The effect of precision

Active Publication Date: 2021-08-03
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the weak stiffness characteristics and ultrasonic vibration characteristics of the robot are not considered in the existing burr height modeling, which leads to the problem of inaccurate prediction accuracy. A robot rotary ultrasonic drilling CFRP / aluminum alloy is proposed. A method for predicting burr heights in laminated structures can improve the accuracy of burr height predictions

Method used

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  • A method for predicting the exit burr height of robotic rotary ultrasonic drilling cfrp/aluminum alloy laminated structure
  • A method for predicting the exit burr height of robotic rotary ultrasonic drilling cfrp/aluminum alloy laminated structure
  • A method for predicting the exit burr height of robotic rotary ultrasonic drilling cfrp/aluminum alloy laminated structure

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Embodiment 1

[0132] The experiment uses a CFRP material made of carbon fiber and epoxy resin orthogonally bidirectionally woven, and the elastic modulus E in the thickness direction 3 =3.32GPa, Poisson's ratio ν is 0.3, and the shear strengths perpendicular to the fiber direction and parallel to the fiber direction are 44.2MPa and 90MPa, respectively. The friction angle during drilling is set to 30°. The grade of the aluminum alloy is Al7075-T7, and the material properties are shown in Table 1; the geometric parameters of the tool are shown in Table 2.

[0133] Table 1 Material properties of aluminum alloy workpieces

[0134]

[0135]

[0136] Table 2 Tool geometry parameters

[0137]

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Abstract

The present invention proposes a method for predicting the outlet burr height of CFRP / aluminum alloy laminated structure by robotic rotary ultrasonic drilling. Firstly, two main cutting edge axial motion trajectory equations are established, and the dynamic drilling thickness and a dynamic drilling thickness during the drilling process are obtained. The average drilling thickness within the vibration cycle; secondly, the axial force on the main cutting edge and the chisel edge were analyzed and calculated respectively, combined with the weak stiffness coefficient K of the robot, the expression of the axial force of the robot rotary ultrasonic drilling was established; again , analyze the formation process of the aluminum alloy exit burr, and determine the initial position of the burr formation; then, use the thin plate deformation theory to calculate the bending deflection caused by the axial force, and then determine the deformation of each processing position; then, analyze the critical yield based on the energy conservation theory Finally, the outlet burr height model was established through volume conservation theory, and the effectiveness of the model was verified by drilling experiments.

Description

technical field [0001] The invention belongs to the technical field of rotary ultrasonic drilling, in particular to a method for predicting the height of burrs at the exit of CFRP / aluminum alloy laminated structure by robot rotary ultrasonic drilling. 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 the application of CFRP / aluminum alloy laminates is the most common. The CFRP / aluminum alloy laminated structure needs to be assembled together by bolts or rivets, which requires a large number of connection holes to be processed at the connection. In order to ensu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/14G06F111/10
CPCG06F30/20G06F2119/06
Inventor 廖文和董松郑侃
Owner NANJING UNIV OF SCI & TECH
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