• Title/Summary/Keyword: Ultrasonic Machining

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The Effects of Ultrasonic Vibration on Surface Finish in Nano-second Laser Machining (나노초 레이저 가공에서 초음파 진동이 가공표면에 미치는 영향)

  • Kang, Bong-Chul;Kim, Gun-Woo;Cho, Sung-Hak;Park, Jong-Kweon;Yang, Min-Yang
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.19 no.3
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    • pp.402-406
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    • 2010
  • Conventionally, the machined surface roughness in nano-second(ns) laser machining is damaged and rough due to thermal effects. To obtain the improved surface finish, the ultrasonic vibration is applied to ns-laser machining. The ultrasonic vibration jig is developed to apply the ultrasonic high precision motion to workpieces. And then the ns-laser machining is conducted to compare the effects of the ultrasonic vibration. The results show that the surface roughness with ultrasonic vibration is smoother than that without the vibration. The phenomenon could be explained as enhancement of heat transfer by ultrasonic vibration.

Micro-machining of Glass Air Hole using Ultrasonic Machining (초음파 가공에 의한 미세 에어홀 가공 기술)

  • 김병희;전성건;남권선;김헌영;전병희
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.04a
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    • pp.48-52
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    • 2004
  • Ultrasonic machining is effective for machining of extreme hard and brittle materials, including glass, ceramic, carbide, graphite. The major machining principle involves the direct hammering as well as the impact of abrasive panicles on the workpiece. Also, it involve cavitation erosion. The general workpiece is flat side. This study attempted micro hole machining of a curved surface of glass tube. Ultrasonic machining is fault of the slow machining speed. An experiment does and got 16 seconds validity machining time as increasing the processing speed. Moreover, entrance crack and surface roughness was similar both machining speed is slow and fast. Several micro hole of glass tube machined using one micro tool, but tool wear is infinitesimal.

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Characteristics of Chemical-assisted Ultrasonic Machining of Glass (화학적기법을 이용한 유리의 초음파가공 특성)

  • Kim, B.H.;Jeon, S.K.;Kim, H.Y.;Jeon, B.H.
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.1349-1354
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    • 2003
  • Ultrasonic Machining process is an efficient and economical means of precision machining on glass and ceramic materials. However, the mechanics of the process with respect to crack initiation and propagation, and stress development in the ceramic workpiece subsurface are still not well understood. In this research, we investigate the basic mechanism of chemical assisted ultrasonic machining(CUSM) of glass through the experimental approach. For the purpose of this study, we designed and fabricated the desktop micro ultrasonic machine. The feed is controlled precisely by using the constant load control system. During the machining experiment, the effects of HF(hydrofluoric acid) characteristics and machining condition on the surface roughness and the material removal rate are measured and compared.

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Machining Characteristics of Micro-EDMed Holes According to Dielectric Fluid, Capacitance and Ultrasonic Vibrations (방전가공을 이용한 미세구멍 가공 시 절연액, 축전용량과 초음파 부가에 따른 가공특성)

  • Seo, Dong-Woo;Yi, Sang-Min;Chu, Chong-Nam;Park, Min-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.12
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    • pp.42-49
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    • 2007
  • When micro holes are machined by EDM, machining characteristics of machined holes are changed according to the machining conditions. Typical machining conditions are the kind of dielectric fluids, capacitance and ultrasonic vibrations. They influence electrode wear, machining time, radial clearance and taper angle. In this paper, machined holes whose depths are 300, 500, $1000\;{\mu}m$ are observed for each machining conditions. Using deionized water as a dielectric fluid makes electrode wear small, machining time short, radial clearance large and taper angle small. High capacitance makes electrode wear high. Ultrasonic vibrations make electrode wear large, machining time short, radial clearance small and taper angle small. From the results of experiments, the optimal machining conditions were obtained to machine highly qualified micro holes.

Ultrasonic Vibration Machining of Inconel (초음파 진동 부가에 의한 인코넬의 선삭가공)

  • Park, Myung-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.3
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    • pp.357-362
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    • 2003
  • Recently, the demand for advanced technology of high precision and high efficiency processing of hard materials such as inconel is increasing with progress of industrial goods. However, the machinability of inconel is very inferior to the other conventional industrial materials and the machining technology for inconel involves many problems to be solved in machining accuracy, machining efficiency, etc. Therefore it is needs to establish the machining technology. The purpose of this study is to develop an advanced ultrasonic vibration machining technology for inconel, using the 60KHz and 75KHz high frequency, amplitude about 8${\mu}{\textrm}{m}$ and 4${\mu}{\textrm}{m}$, respectively. As the result, this new ultrasonic vibration machining is reasonable and suitable for the high efficient. accuracy machining method of inconel.

Effect of Ultrasonic Vibration on the Friction and Wear Characteristics of Aluminum Alloy (초음파 진동이 알루미늄 합금의 마찰 마모 특성에 미치는 영향)

  • Park, Jae-Nam;Lee, Chul-Hee
    • Tribology and Lubricants
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    • v.34 no.4
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    • pp.132-137
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    • 2018
  • Ultrasonic waves are used in various applications in multiple devices, sensors, and high-power machinery, such as processing machines, welders, and cleaners, because the acoustic vibration frequencies are above the human audible frequency range. In ultrasonic machining, electrical energy at a high frequency of 20 kHz or more is converted into mechanical vibration by a vibrator and an amplifier. This technique allows instantaneous separation between a tool and a workpiece during machining, machining by pulse impulse force at the time of re-contact and minimizes the minute elastic deformations of the workpiece and machine tools due to the cutting effect. The Al7075 alloy used in this study is a typical aluminum alloy with superior strength that is mainly used in aircrafts, automobiles, and sporting goods. To investigate the optimal conditions for machining aluminum alloy using ultrasonic vibration, the present experiment utilized the Taguchi orthogonal array method, and the coefficient of friction was analyzed using the characteristics of the Taguchi technique. In ultrasonic friction and abrasion tests, the changes in the friction coefficient were measured in the absence of ultrasonic vibrations and at 28 kHz and 40 kHz. As a result, the most considerable influence on the friction coefficient was found to be the normal load, and the frequency of ultrasonic vibrations increases, the coefficient of friction increases. It was thus confirmed that the amount of wear increases when ultrasonic vibration is applied.

A Study on a Ultrasonic Vibration Assisted Grinding of Alumina Ceramic with Diamond Grinding Tool (초음파 진동을 하는 다이아몬드 연삭공구의 알루미나 세라믹 연삭 가공에 관한 연구)

  • Choi, Young-Jae;Song, Ki-Hyeong;Park, Kyung-Hee;Hong, Yun-Hyuck;Kim, Kyeong-Tae;Lee, Seok-Woo;Choi, Hon-Zong
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.1
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    • pp.13-19
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    • 2012
  • In this study, ultrasonic vibration tool designed and made by using FEM analysis. And machining test was carried out in various machining conditions using ultrasonic vibration capable CNC machine. For work material, alumina ceramic ($Al_2O_3$) was used while for tool material diamond electroplated grinding wheel was used. To evaluate ultrasonic vibration effect, grinding test was performed with and without ultrasonic vibration in same machining condition. In ultrasonic mode, ultrasonic vibration of 20kHz was generated by HSK 63 ultrasonic actuator. The two grinding speeds, 1.67m/s and 3.35m/s, were applied. On the other hand, grinding forces were measured by KISTLER dynamometer.

The Geometric Machining Mechanism of Ultrasonic Drilling (초음파 드릴링의 기하학적 가공 메커니즘 분석)

  • Jang Sung-Hoon;Lee Seok-Woo;Choi Hon-Zong;Lee Sun-Kyu
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.4
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    • pp.76-83
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    • 2005
  • With the acceleration of the miniaturization of products, especially in recent years, machining technologies for these products is in need of improvement. Conventional technologies have limitations in realizing the miniaturization due to the downsizing effects of the tools, which lack sufficient cutting stiffness during machining. The application of ultrasonic vibration is one of the most useful solutions in dealing with the problem. This study focused on the difference of ultrasonic drilling from conventional one in geometrical machining mechanism and the corresponding machining results. In detailed, some mathematical equations for drill cutting edge paths during drilling were extracted and new method to find uncut chip thickness from above equations was suggested. The experiments were carried out through the comparison between the results (disposed chips and internal surface states of holes) of conventional drilling and those of ultrasonic drilling. It was determined that the geometrical paths of cutting edges and analyzed uncut chip thickness agree with the appearance of disposed chips. Furthermore, the change in tool path by ultrasonic vibration resulted in the improvement of surface statement.

Effect of Ultrasonic Vibration on Micro-EDM Channel (Micro-EDM 채널가공에서 초음파 가진의 영향)

  • Lim, Heesung;Hong, Minsung
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.25 no.6
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    • pp.421-425
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    • 2016
  • Micro-EDM is one of the recent fine-machining technologies. Micro-EDM is widely used in precision processes because products manufactured via EDM are free from workpiece hardness. However, the debris produced during the process cause many problems such as reduced precision of the process. The first solution of this problem involves using the milling hole process. Micro-EDM hole process involves an electrode moving rapidly in the vertical direction via a servo system to disperse debris. However, this process can cause reduced work efficiency owing to contact between the electrode and workpiece. In this study, ultrasonic vibration is added to micro-EDM channel machining. Ultrasonic vibration removes the debris during machining and enables precision machining. Consequently, a clean work environment for the subsequent processes is maintained.