[논문]아노다이징 처리된 대형 유압장치의 내면에 대한 연마 조건의 최적화

최수현; 조영태

doi:10.14775/ksmpe.2019.18.7.014

아노다이징 처리된 대형 유압장치의 내면에 대한 연마 조건의 최적화
Optimization of Polishing Conditions for Anodized Inner Surfaces in Large Hydraulic Devices 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.18 no.7, 2019년, pp.14 - 21

Abstract ▼ AI-Helper

Large-diameter hydraulic devices such as the hydraulic reservoir in aircraft that serves to balance the hydraulic pressure in the various hydraulic devices in the cabin and to store hydraulic oil are operated by the internal piston systems. However, since this operates in an environment with high temperature and humidity, it may cause the inner surface to flake during its operation. Therefore, an anodizing surface treatment is applied to improve the corrosion resistance, abrasion resistance, and smooth operation. However, anodizing increases the surface roughness. Accordingly, the polishing process that improves the surface roughness after anodizing is important. However, the existing polishing process is performed manually, which results in an inefficient process. Therefore, in this study, we selected the optimum polishing conditions for effective polishing using the experimental design to improve the polishing process for the $Al_2O_3$ film that forms after anodization. Through experiments, we confirmed that the surface uniformity after polishing was superior as the feed rate was slower when the same polishing time had been applied.

주제어

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문제 정의

Therefore, this study highlights the objective to improve the secondary polishing stage, which concerns the improvement of the surface roughness that has increased following the anodizing surface treatment. As such, the optimum condition for efficient polishing is selected and verified through the design of experiment approach with a developed superfinishing machine^[9].

가설 설정

2. The polishing time of 96 s at a feed rate of 0.279 mm/rev ascertained excellent surface roughness uniformity. Likewise, the uniform surface could be obtained with slower transfer speed, but not higher.

제안 방법

A series of corrections was employed to give confidence in comparing the trends of the T₀ values under various polishing conditions. The curve fitting in Fig.
2 μm, even at the extent where the feed rate of the tool was varied in the turning experiment using R bite. Consequently, these studies indicated the enhancement of the polishing process with its integration with the final process by simultaneously achieving the purpose of the primary polishing process when the finishing process was conducted using R bite.
Experimental factors were selected in reference to previous studies^[9-10], from a range of several factors that are presumed to have an impact on the results, such as the spindle speed of the specimen, the polishing film feed rate, the oscillation speed of the superfinisher, contact roller hardness, contact pressure between the specimen and the polishing film, and polishing film grain size. Additionally, the levels for each factor were selected based on flexibility, in reference to a previous research, as well as the experience of the experimenter within the range of safe operation of equipment.
The secondary polishing stage during the manufacture of a hydraulic reservoir was improved through the conducted experiments, which employed the design of experiment approach, for optimum conditions determination. The generalizations for deriving the conditions yielding a uniform surface after polishing could be stated as follows:

이론/모형

Moreover, the optimum superfinishing conditions were selected based on the results of both Taguchi and Box-Behnken methods, which yielded an oscillation speed and contact pressure different from those shown in Table 9. Such difference in optimum conditions was verified through experiments, which revealed the polishing time difference of approximately 2 s between the contact pressures of 3 and 5 bar.
The KOSAKA SE-3500K model was used for performing the surface roughness measurement, and the average value was obtained from measurements in the circumferential direction four points within intervals of 90°.
The polishing experiment employed the Taguchi method for selecting the optimum polishing conditions under the given conditions with the minimum experiment.

성능/효과

1. After the optimum superfinishing conditions were defined for the Al₂O₃materials through the Taguchi and Box-Behnken methods, the results of the verification experiment showed a significant difference in the oscillation speed and contact pressure. The optimum conditions include: spindle speed = 112 rpm, polishing film feed rate = 30 mm/rev, oscillation speed = 334 rpm, contact roller hardness = 90 Hs, contact pressure = 5 bar, polishing film grain size = 9 ㎛.
Table 8 shows the results of the ANOVA analysis for the creation of response surface based on the experimental results. Considering the result (P-Value) of the lack of fit term and pooling the non-significant term twice yielded a second-order term of the oscillation speed, an identified linear term as a significant factor, and the derivation of a response surface creation equality (Eq. (1)).

참고문헌 (14)

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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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