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A Method for Predicting the Stability Region of Lateral Chatter in Rotary Ultrasonic Drilling

A technology of rotary ultrasonic and prediction method, which is applied in geometric CAD, design optimization/simulation, special data processing applications, etc., and can solve problems such as no prediction model suitable for rotary ultrasonic drilling

Active Publication Date: 2021-08-03
NANJING UNIV OF SCI & TECH
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  • Application Information

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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 rotary ultrasonic drilling in the existing stability analysis, and proposes a method for predicting the stable domain of lateral chatter in rotary ultrasonic drilling, which can realize the prediction of the stable domain

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  • A Method for Predicting the Stability Region of Lateral Chatter in Rotary Ultrasonic Drilling
  • A Method for Predicting the Stability Region of Lateral Chatter in Rotary Ultrasonic Drilling
  • A Method for Predicting the Stability Region of Lateral Chatter in Rotary Ultrasonic Drilling

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Embodiment 1

[0110] The drilling force coefficient is calculated from the experiment of rotary ultrasonic drilling aluminum alloy, and the results are shown in Table 1. The dynamic parameters of the rotary ultrasonic drilling system obtained through the modal parameter identification experiment are shown in Table 2. Feed per revolution f r 0.01mm, ultrasonic vibration amplitude A is 0 / 10 / 20μm, ultrasonic vibration frequency F is 20KHz and the number of tool teeth is N f for 2.

[0111] Table 1 Drilling force coefficient

[0112]

[0113] Table 2 Modal parameters of rotary ultrasonic drilling system

[0114]

[0115] Through the prediction method described above, three stability curves with ultrasonic vibration amplitudes A of 0 / 10 / 20 μm were calculated and drawn. According to the definition of the stability curve, the stability region of the system is below the curve. It can be found that the addition of rotational ultrasonic vibration realizes the expansion of the drilling stab...

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Abstract

The present invention proposes a method for predicting the lateral chatter stability region of rotary ultrasonic drilling. Firstly, based on the kinematics analysis of the rotary ultrasonic drilling bit, the expressions of the axial feed and ultrasonic vibration in the static drilling thickness are obtained, combined with dynamic drilling The transient drilling thickness model is established; secondly, the dynamic drilling force relationship is established by using the drilling thickness exponential function method; thirdly, according to the linear theory of the nonlinear periodic function, the lateral chatter analysis model is established in this processing mode; The frequency domain solution method was used to solve the above model, and the expressions of the critical drilling depth and the corresponding rotational speed were obtained; finally, the lateral chatter stability curve of rotary ultrasonic drilling was drawn by using MATLAB software programming to realize the prediction of the stable region.

Description

technical field [0001] The invention belongs to the technical field of rotary ultrasonic drilling, in particular to a method for predicting the stability domain of lateral vibration of rotary ultrasonic drilling. Background technique [0002] During the processing of parts in modern manufacturing (such as military aircraft, space shuttle, ship, automobile), it is necessary to drill a large number of holes in the main material of the part for later assembly. 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 lateral vibration of the drill bit seriously affects the roundness, hole diameter deviation and surface quality of the hole during hole making, and the lateral vibration will accelerate tool wear and generate a lot of noise. Therefore, it is very important to improve the quality of hole machining to achiev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/17
CPCG06F30/17G06F30/20
Inventor 郑侃董松廖文和李志华孙连军
Owner NANJING UNIV OF SCI & TECH
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