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

A technology of rotating ultrasonic and composite materials, applied in the direction of testing machinability, etc., can solve the problem of not using tri-point drills

Active Publication Date: 2020-05-22
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 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

Method used

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

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Embodiment 1

[0162] In the experiment, a CFRP material made of carbon fiber and epoxy resin orthogonal bidirectional weaving was used, and the shear strengths perpendicular to the fiber direction and parallel to the fiber direction were 44.2MPa and 90MPa, respectively. The friction angle during drilling is set to 30°. The geometric parameters of the tool are shown in Table 2.

[0163] Table 2 Geometric parameters of three-point drill

[0164]

[0165] Under the single factor experimental conditions, 12 groups of three-tip drill rotary ultrasonic drilling experiments were carried out. As mentioned above, the final prediction formula (21) can be used to predict the axial force under the drilling parameters. The comparison between the experimental value and the theoretical value of the drilling force is as Figure 5 shown. It can be seen from the comparison between the experimental value and the theoretical value that the change trend of the predicted axial force of rotary ultrasonic dr...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/58
CPCG01N3/58
Inventor 廖文和董松郑侃李志华马文瑞
Owner NANJING UNIV OF SCI & TECH
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