• Title/Summary/Keyword: Micro shaft

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Micro End-milling Technology for Micro Pole Structures (미세 폴 구조물 가공을 위한 마이크로 앤드밀링 기술)

  • Je, Tae-Jin;Choi, Doo-Sun;Lee, Eung-Sug;Hong, Sung-Min;Lee, Jong-Chan;Choi, Han
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.4 no.4
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    • pp.7-13
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    • 2005
  • In the case of fabricating micro pole structures such as column, square-pole and gear shaft by the micro end-milling process, it can be useful in the fields of industry, for example, micro parts, electrode for electrical discharge machining and micro mold for injection molding. In this study, machining factors and the process were analyzed. Machining experiments of various micro pole configurations were performed. Analysis of the change and effect of the cutting force according to the machining conditions was carried out. An analytical study of the deformation of the micro pole caused cutting conditions and cutting force through the finite element method and ANSYS program was carried out. As a result, this research presented a method of fabricating the column pole of below $100{\mu}m$ diameter with high aspect ratio by using micro end-milling process, and based on that, a method of fabricating a variety of applicable structures. Also the minimum size of the pole capable of fabricating through theory and experiment were demonstrated.

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Micro End-Mill Machining Characters and its Applications (마이크로 앤드밀의 가공특성분석 및 응용가공 연구)

  • Jae, Tae-Jin;Lee, Eung-Sook;Choi, Doo-Sun;Hong, Sung-Min;Lee, Jong-Chan;Choi, Hwan
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.589-592
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    • 2003
  • In the machining process of micros shape by using high-precision machining system and micro end-mill, it is important for machining characters of tools to be grasped in order to stably use tools of micro end-mill. In this study. we carried out an analytical experiment of basic machining features by using end-mill tools for the purpose of damage prevention and manufacture of high quality when the tools of micro end-mill are used. This experiment used a micro machining system with high precision and a variety of end-mill tools commercialized from tens to hundreds microns in diameter. To establish an optimal machining condition without tool damage, cutting force was analyzed according to the changes of tool diameter and cutting conditions such as cutting speed. feed rate, depth of cut. And an examination was performed for the shape and surface illumination of machining surface according to the changes of machining conditions. Based on these micro machining conditions, micro square pillar, cylinder shaft. thin wall with high aspect ratio, and micro 3-D structures such as micro gear and fan were manufactured.

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Experimental Study on the WEDG Characteristics of WC-Co -Relationship between Surface Integrity and Dielectric Conditions- (WEDG법에 의한 WC-Co의 가공특성의 실험적 연구 -가공액환경에 따른 표면특성-)

  • 정태현
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.246-251
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    • 2000
  • In this paper, Wire electric discharge grinding(WEDG) method for manufacturing the micro shaft was introduced and the machining characteristics was investigated. from the experimental results, it was concluded that high surface integrity could be obtained by use of dielectric fluid spraying method and small capacitive condenser.

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A Study on the Event Processing for Electronic Control (전자제어의 Event 처리방법에 관한 연구)

  • 이종승;이중순;정성식;하종률
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.3
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    • pp.115-122
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    • 1998
  • For digital engine control timings, such as ignition, are based on the crank shaft angle. Therefore, it is very important that the angle of the crank shaft can be detected with accuracy for optimal ignition timing. Sequential multi-point injection(MPI) systems that have independent injection events for each cylinder, are used to inject an accurate quantity of fuel, and to cope with varying engine status promptly. In this study the distributorless ignition timing. A crankshaft position sensor has been installed such that it generates a number of pulses per crankshaft revolution to permit accurate detection of the crank shaft angle. An event detecting algorithm has been developed, which detects the crank shaft pulses generated by the position sensor, and the software outputs the required control signals at given crank angle values. We clarified that the hardware method is the best way to increase the performance of the control system, because the event detecting duration T(1+2)max becomes zero.

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A Study on the Improvement of Transmission Error and Tooth Load Distribution using Micro-geometry of Compound Planetary Gear Reducer for Tractor Final Driving Shaft (트랙터 최종구동축용 복합유성기어 방식 감속기의 Micro-geometry를 이용한 전달 오차 및 치면 하중 분포 개선에 관한 연구)

  • Lee, Nam Gyu;Kim, Yong Joo;Kim, Wan Soo;Kim, Yeon Soo;Kim, Taek Jin;Baek, Seung Min;Choi, Yong;Kim, Young Keun;Choi, Il Su
    • Journal of Drive and Control
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    • v.17 no.1
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    • pp.1-12
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    • 2020
  • This study was to develop a simulation model of a compound planetary gear reducer for the final driving shaft using a gear analysis software (KISSsoft, Version 2017, KISSsoft AG, Switzerland). The aim of this study is to analyze transmission error and the tooth load distribution through micro-geometry using the simulation model. The tip and root relief were modified with Micro-geometry in the profile direction, and crowning was modified with Micro-geometry in the lead direction. The transmission error was analyzed using the PPTE (Peak to Peak Transmission Error) value, and the tooth load distribution was analyzed for the concentrated stress on the tooth surface. As a result of modifying tip and relief in the profile direction, the transmission error was reduced up to 40.7%. In the case of modifying crowning in the lead direction, the tooth load was more evenly distributed than before and decreased the stress on the tooth surface. After modifying the profile direction for the 1st and 2nd planetary gear train, the bending and contact safety factors were increased by 31.7% and 17%, and 18.3% and 12.5% respectively. Moreover, the bending and safety factors after modifying lead direction were increased by 59.5% and 32.7%, respectively for the 1st planetary gear train, and 59.6% and 43.6%, respectively for the 2nd planetary gear train. In future studies, the optimal design of a compound planetary gear reducer for the final driving shaft is needed considering both the transmission error and tooth load distribution.

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.

Study on Effect of Micro Tooth Shape Modification on Power Transmission Characteristics based on the Driving Gear of Rotating Machining Unit (마이크로 치형수정이 선회가공 유닛 구동기어의 동력전달 특성에 미치는 영향에 관한 연구)

  • Jang, Jeong-Hwan;Qin, Zhen;Kim, Dong-Seon;Wu, Yu-Ting;Lyu, Sung Ki
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.6
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    • pp.91-97
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    • 2019
  • Rotating machining unit is a revolutionary product that can process worm shaft or spiral shaft with fast and precise, a rotary type cutting tool, which is attached to automatic lathe and processes spiral groove on outer circumference of round bar. In this work, a study on micro tooth shape modification method of driving gear train in the rotating machining unit was presented. To observe the effect on power transmission characteristics of the driving gear pair, visualize the gear meshing condition and the load distribution on the gear teeth by using the professional gear train analysis program RomaxDesigner. By comparing the repeated analysis results, the effect of micro tooth shape modification on power transmission characteristics on driving gear can be summarized. The optimized gears were fabricated and measured by precision tester as a validation in this research.

Evaluation of Cooling Process for Marine Shaft Forging Products (선박용 축류 단조품 냉각공정 평가)

  • Park, Sang-Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.9
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    • pp.352-357
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    • 2020
  • This study was performed to solve the quality problems of forging propeller shaft components in the marine diesel engines during the final cooling process and provide reasonable guidelines to increase the production of forging products. Residual hydrogen existing on the inside of forging products begins to diffuse and accumulates at the pores, micro-fissures, and grain boundaries as the temperature of forging products begins to decrease and reaches a critical temperature range, and finally transforming into internal defects. These defects were easily found near the surface of products after milling the surface of forging products. In this work, four types of forging products (shaft flange, shaft journal, thrust shaft, and propeller shaft) were chosen to evaluate the temperature history of products during the cooling process, employing non-linear numerical analyses with the ANSYS program. The times elapsed to reach 250 ℃ after cooling were approximately 9 ~ 23 hours for each forging product. These times can be used as cooling process guidelines on the quality and productivity of products after heat treatment.

A Digitized Decoupled Dual-axis Micro Dynamically Tuned Gyroscope with Three Equilibrium Rings

  • Xia, Dunzhu;Ni, Peizhen;Kong, Lun
    • Journal of Electrical Engineering and Technology
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    • v.12 no.1
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    • pp.385-395
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    • 2017
  • A new digitized decoupled dual-axis micro dynamically tuned gyroscope with three equilibrium rings (TMDTG) is proposed which can eliminate the constant torque disturbance (CTD) caused by the double rotation frequency of a driving shaft with a micro dynamically tuned gyroscope with one equilibrium ring (MDTG). A mechanical and kinematic model of the TMDTG is theoretically analyzed and the structure parameters are optimized in ANSYS to demonstrate reliability. By adjusting the thickness of each equilibrium ring, the CTD can be eliminated. The digitized model of the TMDTG system is then simulated and examined using MATLAB. Finally, a digitized prototype based on FPGA is created. The gyroscope can be dynamically tuned by adjusting feedback voltage. Experimental results show the TMDTG has good performance with a scale factor of $283LSB/^{\circ}/s$ in X-axis and $220LSB/^{\circ}/s$ in Y-axis, respectively. The scale factor non-linearity is 0.09% in X-axis and 0.13% in Y-axis. Results from analytical models, simulations, and experiments demonstrate the feasibility of the proposed TMDTG.

Self-Tuning Control of SRM for Maximum Torque with Current and Shaft Position Feedback

  • Seo Jong-yun;Yang Hyong-yeol;Kim Kwang-Heon;Lim Young-Cheol;Cha Hyun-Rok;Jang Do-Hyun
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.351-354
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    • 2001
  • In this paper, we present self-tuning control of switched reluctance motor for maximum torque with phase current and shaft position sensor. Determination method of turn-on/off angle is realized by using self-tuning control method. During the sampling time, micro-controller checks the number of pulse from encoder and compare with the number of pre-checked pulse. After micro-controller calculates between two data, it moves forward or backward turn-off angle. When the turn-off angle is fixed optimal turn-off angle, the turn-on angle automatically moves forward or backward by a step using self-tuning control method. And then, optimal turn-off angle is searched once again. As such a repeating process, turn-on/off angle is moved automatically to obtain the maximum torque. The experimental results are presented to validate the self-tuning algorithm.

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