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BTA深孔钻削孔径分析模型及自导向加工机理

Analytical Model of Hole Diameter and Self-Guiding Machining Mechanism of BTA Deep Hole Drilling.

作者信息

Li Xubo, Zheng Jianming, Yu Biao, Du Yongqiang, Zhou Yanan

机构信息

College of Mechanical Engineering, Baoji University of Arts and Sciences, Baoji 721016, China.

Shaanxi Key Laboratory of Advanced Manufacturing and Evaluation of Robot Key Components, Baoji 721016, China.

出版信息

Materials (Basel). 2022 Aug 2;15(15):5329. doi: 10.3390/ma15155329.

DOI:10.3390/ma15155329
PMID:35955264
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9369670/
Abstract

The goal of this study was to explore the self-guided machining mechanism of boring and trepanning association (BTA) deep hole drilling and realize precise control of the machining quality. The motion analysis method was used to analyze the center motion trajectory of the drill during the entrance, and the self-guiding mechanism and hole-forming mechanism of BTA deep hole drilling were revealed. Considering the bending deformation of the drilling tube and the tool structure parameters, according to the elastic-plastic deformation theory and Hertzian contact theory, a novel analytical model of the extrusion contact between the guide pads and the hole wall of the BTA deep hole drilling was established for the theoretical prediction of the extrusion deformation and the machining hole diameter. Combined with the finite element method (FEM) simulation model, the variation law of the contact inclination angle, contact stress, and extrusion deformation of the guide pads and the hole wall with the drilling conditions were studied. The total extrusion deformation between the guide pad and the hole wall was between 10 and 50 μm. The maximum error between the FEM simulation results and the test results was 18.1%, and the maximum error between the analytical model results and the test results was 23.6%. The simulation and experimental results showed that the established extrusion contact model could accurately predict the extrusion deformation of the hole wall and the machining hole diameter.

摘要

本研究的目的是探索枪钻深孔加工的自导向加工机理，并实现对加工质量的精确控制。采用运动分析方法对钻头在入口处的中心运动轨迹进行分析，揭示了枪钻深孔加工的自导向机理和孔形成机理。考虑钻杆的弯曲变形和刀具结构参数，根据弹塑性变形理论和赫兹接触理论，建立了一种新型的枪钻深孔加工导向块与孔壁挤压接触分析模型，用于理论预测挤压变形和加工孔径。结合有限元模拟模型，研究了导向块与孔壁的接触倾角、接触应力和挤压变形随钻孔条件的变化规律。导向块与孔壁之间的总挤压变形在10～50μm之间。有限元模拟结果与试验结果的最大误差为18.1%，分析模型结果与试验结果的最大误差为23.6%。模拟和实验结果表明，所建立的挤压接触模型能够准确预测孔壁的挤压变形和加工孔径。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b237/9369670/d4ae0e3c2d16/materials-15-05329-g015.jpg
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