[논문]진동을 이용한 건식 마이크로-WEDM 에 대한 실험적 연구 및 프로세스 최적화

양승한

doi:10.7736/kspe.2014.31.3.215

진동을 이용한 건식 마이크로-WEDM 에 대한 실험적 연구 및 프로세스 최적화
Experimental Study and Process Optimization for Vibration-assisted Dry Micro-WEDM 원문보기

한국정밀공학회지 = Journal of the Korean Society for Precision Engineering, v.31 no.3, 2014년, pp.215 - 222

Abstract ▼ AI-Helper

This paper presents an experimental study of a vibration-assisted dry micro-wire electrical discharge machining (${\mu}$-WEDM) utilized in high precision and micro-manufacturing area. The assisted vibration was applied to the workpiece using a piezoelectric actuator, and high pressure air was injected directly into the machining gap through a nozzle. Investigation experiments were performed to estimate the importance of input parameters and it was observed from experiment results that the width (kerf) of the cutting slot and the machining time were significantly affected by the air injection pressure and input energy. Moreover, it was also observed that there exists an optimal relationship between the machining time and input parameters including the air pressure and vibration frequency and amplitude. Central composite design based experiments were also carried out, and empirical models of the machining time and cutting slot kerf have been developed using the response surface methodology to analyze and optimize the process.

주제어

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문제 정의

Therefore, it is necessary to improve the efficiency of this machining technology to expand its applications in the manufacturing industry. Thus, a study on the effect of input parameters and assisted vibration to the machining performance of a dry micro-WEDM has been carried out and is presented in this paper. In this study the effect of different air injection pressures, input energies and vibration parameters to machining time (MT) and machined slot width (kerf) have been investigated.

제안 방법

1. Experiments were conducted on a multi-process micro machine tool (DT110, Mikrotools Pte Ltd., Singapore) with a RC-type micro-WEDM system. In all experiments, a zinc coated brass wire electrode with 70 µm diameter was used to cut 300 µm length slots on 500 µm thick workpieces of grade-5 titanium alloy.

이론/모형

68, ±1, 0) represent the axial points, cube points or factorial points and center point respectively. Since optimal relations between the machining performance and the input parameters have been observed from the experiment results, the second-degree polynomial was selected for the modeling. The CCC design for three factors includes eight factorial points, six axial points and six duplicated center points.

성능/효과

10. The experiment results show good matches with the predicted values which prove also that the other unknown factors did not affect the process significantly. In addition, at low air injection pressure, poor flushing condition can cause inaccurate prediction and high discrepancy.

참고문헌 (17)

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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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