• Title/Summary/Keyword: Micro Cutting Machine

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Characteristics of a PZT-Driven Micro Depth Adjustment Device for Cutting Coated Film (박막 절단용 PZT 구동 미세깊이 조절 장치의 특성)

  • Ryu, Sang-Oh;Kim, Hwa-Young;Ahn, Jung-Hwan
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.23 no.6
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    • pp.630-635
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    • 2014
  • This study aims to develop a PZT-driven depth adjustment device with a flexure hinge and to investigate its static/dynamic characteristics. This device will be applied to rapidly and accurately trace a flat surface with slight waviness of up to several hundreds of micrometers in magnitude. One typical example is to cut a film coated on a steel plate. A depth control system composed of PMAC, PZT/PZT amplifier, flexure hinge/knife, and laser displacement sensor is implemented on a desktop three-axis machine and an actual cutting test is conducted on a steel workpiece with a sinusoidal-wavy surface. It is verified that the dynamic characteristics of the device limit the maximum cutting speed and depth precision.

A Study on Shield Wire Stripping of Micro Coaxial Cable for Medical Device Using Nd:YAG Laser (Nd:YAG 레이저를 이용한 의료기기용 마이크로 동축케이블의 실드선 탈피에 관한 연구)

  • Lee, Jeong-Wan;Kim, Jung-Hoon
    • Journal of Industrial Technology
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    • v.26 no.B
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    • pp.35-41
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    • 2006
  • Recently, as ultrasonic medical devices are gradually developed, many of those requires smaller and more precision coaxial cables in probe. So, the use of micro coaxial cable becomes an efficient solution for ultrasonic machine. However, there are many difficulties in stripping micro coaxial cable by traditional mechanical process. In this paper, we use the Nd-YAG laser for the efficient stripping of conduct wire of cable. We propose a new method to strip the shield wire of micro coaxial cable. Through some experiments, we found that there is a new possibility in the proposed method. Also, in order to enhance the performance, we propose a preprocess of the cable before stripping.

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Trends of Flat Mold Machining Technology with Micro Pattern (미세패턴 평판 금형가공 기술동향)

  • Je, Tae-Jin;Choi, Doo-Sun;Jeon, Eun-Chae;Park, Eun-Suk;Choi, Hwan-Jin
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.2
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    • pp.1-6
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    • 2012
  • Recent ultra-precision machining systems have nano-scale resolution, and can machine various shapes of complex structures using five-axis driven modules. These systems are also multi-functional, which can perform various processes such as planing, milling, turning et al. in one system. Micro machining technology using these systems is being developed for machining fine patterns, hybrid patterns and high aspect-ratio patterns on large-area molds with high productivity. These technology is and will be applied continuously to the fields of optics, display, energy, bio, communications and et al. Domestic and foreign trends of micro machining technologies for flat molds were investigated in this study. Especially, we focused on the types and the characteristics of ultra-precision machining systems and application fields of micro patterns machined by the machining system.

Cutting Characteristics of Oxygen-Free Using the Ultra Precision Machining (초정밀가공기를 이용한 무산소동 절삭특성)

  • 고준빈;김건희;원종호
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.12
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    • pp.120-126
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    • 2002
  • The needs of ultra-precisely machined parts are increasing more and more. But the experimental data required to ultra precision machining of nonferrous metal is insufficient. The behavior of cutting in micro cutting area is different from that of traditional cutting because of the size effect. Copper is widely used as optical parts such as LASER reflector's mirror and multimedia instrument. In experimental, after oxygen-free copper is machined by ultra precision machine with natural mono crystal diamond tool (NCD) and synthetic poly crystal diamond tool (PCD), we compared chip formation and tool's wear according to used tool. Also, we researched optimized cutting condition with the results measured according to cutting condition such as spindle speed, feed rate and depth of cut. As a result, the optimal working condition that makes good surface roughness is obtained. The surface roughness is good when spindle speed is above 80 m/min, and feed rate is small and depth of cut is above 0.5 ${\mu}{\textrm}{m}$. In cutting of klystron anode and cavity 3.2 nmRa of surface roughness is obtained.

Modeling and multiple performance optimization of ultrasonic micro-hole machining of PCD using fuzzy logic and taguchi quality loss function

  • Kumar, Vinod;kumari, Neelam
    • Advances in materials Research
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    • v.1 no.2
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    • pp.129-146
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    • 2012
  • Polycrystalline diamond is an ideal material for parts with micro-holes and has been widely used as dies and cutting tools in automotive, aerospace and woodworking industries due to its superior wear and corrosion resistance. In this research paper, the modeling and simultaneous optimization of multiple performance characteristics such as material removal rate and surface roughness of polycrystalline diamond (PCD) with ultrasonic machining process has been presented. The fuzzy logic and taguchi's quality loss function has been used. In recent years, fuzzy logic has been used in manufacturing engineering for modeling and monitoring. Also the effect of controllable machining parameters like type of abrasive slurry, their size and concentration, nature of tool material and the power rating of the machine has been determined by applying the single objective and multi-objective optimization techniques. The analysis of results has been done using the MATLAB 7.5 software and results obtained are validated by conducting the confirmation experiments. The results show the considerable improvement in S/N ratio as compared to initial cutting conditions. The surface roughness of machined surface has been measured by using the Perthometer (M4Pi, Mahr Germany).

Analysis of Characteristic Evaluation of Microdrilling for the Cemented Carbides Materials (초경합금 소재 마이크로드릴의 가공특성 평가)

  • 김건회
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.6
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    • pp.52-59
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    • 2002
  • Resently, reduction of industrial products in size and weight has increased by the application of micro-drill for gadgets of high precision and gave rise to a great interest in a micro-drilling. Due to the lack of tool stiffness and the chip packing, micro-drilling requires not only the robust tool structure which has not affected by the vibration, but also the effective drilling methods designed to prevent tool fracture from cutting troubles. Firstly, this paper presents a optimum characteristic evaluation method of 0.15mm microdrill in consideration of new manufacturing processes for improving the product rate and extend the tool life, and secondly suggest between microdrilling characteristic properties of tool md evaluation of workpiece quality through experiment.

A Study on the Ultrasonic Micro-machining and Measurement System (초음파 초정밀 가공 및 측정시스템에 대한 연구)

  • Ju, Jong-Nam;Han, Dong-Cheol;Park, Hui-Jae;Park, Sang-Sin;Je, Seong-Uk
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.7
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    • pp.133-140
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    • 2002
  • Ultrasonic Machining (USM) is widely used in cutting of non-conductive, brittle workpiece materials such as engineering ceramics. However, USM has a limitation in its application to micro machining because problems are occurred in attaching micro tools to the machine and maintaining high precision. Therefore Micro Ultrasonic Machining (MUSM) with WEDM is proposed in this research. The experiments are produced as the change of shaft diameter and abrasive size.

Shield Wire Stripping of Micro Coaxial Cable for Medical Device Using Laser (레이저를 이용한 의료기기용 미세 동축케이블의 실드선 탈피)

  • Lee, Jeong-Wan;Kim, Jung-Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.9
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    • pp.64-71
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    • 2009
  • Recently as ultrasonic medical devices are gradually developed, many of those require smaller and more precision coaxial cables in the probe. So, the use of micro coaxial cable becomes an efficient solution for ultrasonic machine. However, there are many difficulties in stripping micro coaxial cable by traditional mechanical process. In this paper we use the Nd:YAG laser for the efficient striping of conduct wire of cable. Through some experiments, we found that there is a new possibility in the proposed method. Also, we propose a pre-process of the cable before stripping in order to enhance the performance.

Improvement of circular cutting using voltage control of piezo-actuator in micro milling (마이크로밀링에서 피에조 구동기의 전압제어를 이용한 원주가공의 성능향상)

  • Seok J. W.;Chung B. M.;Ko T. J.;Kim H. S.;Park J. K.
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2005.05a
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    • pp.446-452
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    • 2005
  • Recently, there are many studies for the micro-machining using Piezo actuator. However, because of its step by step motion, it is nearly impossible to increase the machining accuracy for a circular path. To increase the accuracy, it is well known that it is necessary the finer and synchronous movement for x-y axes. Therefore, this paper proposes a voltage control for finer movement of the actuator, and realizes a synchronous control for the x-y axes. The experimental results show that the machining accuracy is remarkably improved.

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Micro-Crack Analysis from Ultra-Precision Diamond Turning of IR Optic Material (적외선 광학 소재의 초정밀 선삭가공시 발생하는 미세균열 연구)

  • Jeong, Byeongjoon;Kim, Geon-Hee;Myung, Tae Sik;Chung, Eui-Sik;Choi, Hwan-Jin;Yeo, In Ju;Jeon, Minwoo
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.11
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    • pp.905-910
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    • 2016
  • Infrared (IR) optic lens can be fabricated by a single point diamond turning (SPDT) machine without subsequent polishing process. However, this machining process often leaves micro-cracks that deteriorate the surface quality. In this work, we propose an experimental design to remove micro-cracks on IR lens. The proposed design gathered data between cutting process condition and Rt surface roughness. This is of great importance because the scale of micro-cracks is a few micrometer. Rt surface roughness is suitable for analyzing maximum peak height signals of the profile. The experimental results indicate that feed per revolution variable is one of the most dominant variable, affecting the generation micro-cracks on IR lens surfaces.