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Rotary ultrasonic drilling transverse vibration stability domain predicting method

A technology of rotary ultrasonic and prediction method, which is applied in the direction of instrumentation, geometric CAD, calculation, etc., can solve the problems that there is no prediction model suitable for rotary ultrasonic drilling, and achieve the effect of predicting the stable domain of lateral vibration of rotary ultrasonic drilling

Active Publication Date: 2018-07-06
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 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

Method used

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  • Rotary ultrasonic drilling transverse vibration stability domain predicting method
  • Rotary ultrasonic drilling transverse vibration stability domain predicting method
  • Rotary ultrasonic drilling transverse vibration stability domain predicting method

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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 invention provides a rotary ultrasonic drilling transverse vibration stability domain predicting method. The method includes the steps of firstly, acquiring the expression of axial feeding and ultrasonic vibration parts in static drilling thickness on the basis of rotary ultrasonic drilling bit kinematics analysis, and using dynamic drilling thickness to build a transient drilling thickness model; secondly, using a drilling thickness exponential function method to build a dynamic drilling force relation; thirdly, according to the linear theory of a nonlinear periodic function, building a transverse vibration analysis model under the machining manner; fourthly, using a frequency domain solving method to solve the models above to obtain the expression of a critical drilling depth and corresponding rotation speed; fifthly, using MATLAB software to program and draw a rotary ultrasonic drilling transverse vibration stability curve to achieve stability domain predicting.

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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
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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