综合补偿几何误差和热误差以提高大型零件孔加工位置精度的技术

IF 1.9 4区 工程技术 Q2 Engineering
Geon-Woo Gu, Min-Suk Park, Jun-Ho Suh, Hoon-Hee Lee
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引用次数: 0

摘要

飞机机翼结构等大型零件需要进行大量的孔加工,以便在零件之间进行装配。随着对孔位置精度的要求(如在行列式装配(DA)概念中),确保孔加工的位置精度变得越来越重要。具体来说,在大型零件的孔加工过程中,由于机床和工件的温度变化会产生热膨胀,因此会产生很大的误差。本研究提出了一种通过补偿机床和工件的几何误差和热误差来有效降低大型零件孔加工位置误差的技术。热位移误差代表机床温度变化引起的体积误差变化,通过测量在参考温度(20 °C)下测量的热膨胀系数较低的主件上两个球体中心之间的距离来估算。由工件温度变化引起的热膨胀误差是通过假设工件温度与加工前切削液温度相同来估算的。孔加工误差通过考虑在参考温度下测量的几何误差以及机床和工件的热误差进行综合补偿。在验证实验中,最大误差提高了 60.2%,并证实误差趋势明显减小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A Technique for Integrated Compensation of Geometric Errors and Thermal Errors to Improve Positional Accuracy of Hole Machining in Large-Size Parts

A Technique for Integrated Compensation of Geometric Errors and Thermal Errors to Improve Positional Accuracy of Hole Machining in Large-Size Parts

Large-size parts such as aircraft wing structures require a lot of hole machining for assembly between parts. As demand for hole positional accuracy, such as in determinant assembly (DA) concept, securing the positional accuracy of hole machining is becoming more important. Specifically, during the hole machining of large-size parts, significant errors occur due to thermal expansion according to temperature change of a machine tool and a workpiece. In this study, a technique for efficiently reducing the positional error of hole machining in large-size parts is proposed by compensating geometric errors and thermal errors of a machine tool and a workpiece. The thermal displacement error, representing changes in volume error due to temperature variations in the machine tool, is estimated by measuring the distance between the centers of two spheres on the master with low thermal expansion coefficient measured at the reference temperature (20 °C). The thermal expansion error, caused by variations in workpiece temperature, is estimated by assuming the temperature of the workpiece to be that of the cutting fluid just before machining. Hole machining errors are integrally compensated by considering the geometric error measured at the reference temperature and the thermal errors of the machine tool and the workpiece. In the verification experiment, the maximum error was improved by 60.2%, and it was confirmed that the tendency of the error was significantly reduced.

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来源期刊
CiteScore
4.10
自引率
10.50%
发文量
115
审稿时长
3-6 weeks
期刊介绍: The International Journal of Precision Engineering and Manufacturing accepts original contributions on all aspects of precision engineering and manufacturing. The journal specific focus areas include, but are not limited to: - Precision Machining Processes - Manufacturing Systems - Robotics and Automation - Machine Tools - Design and Materials - Biomechanical Engineering - Nano/Micro Technology - Rapid Prototyping and Manufacturing - Measurements and Control Surveys and reviews will also be planned in consultation with the Editorial Board.
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