• Title/Summary/Keyword: Machining Test

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The analysis of EDM characteristics for Cu-electrode using LIGA process (LIGA 공정을 이용한 Cu전극의 방전가공 특성 분석)

  • Lee, S.H.;Jung, T.S.;Chang, S.S.;Kim, J.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.05a
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    • pp.383-386
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    • 2007
  • In this study, the analysis was carried out for Electrical Discharge Machining (EDM) characteristics of the Cu electrodes by LIGA process. The shape of electrodes has 324 pins for the cavity of BGA(Ball Grid Array) type test socket mold. BGA test sockets are used in the inspection process of the semi-conductor I.C chip manufacturing. In the work, the machining performance for EDM of the electrodes was analyzed on dimensional accuracy and wear rate. The dimensional accuracy was measured for dimension of the pins, pitch size between the pins and the roundness of corner edge using optical measuring machine.

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A Study on the Compensation of the Thermal Errors for Machine Tool (공작기계 열변위 보정에 관한 연구)

  • 이인재
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.4
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    • pp.117-122
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    • 2000
  • This paper presents an indirect compensation of thermal errors during machining , in which thermal error is modelled as a linear regression of temperatures measured at 4 specified positions. In this regression model, weighting coefficients of the measured temperatures were estimated by using the least square method. The grinding test with compensation , after 4 -hour warning-up operation before the test, showed that the maximum machining error of the work pieces was reduced to 12${\mu}{\textrm}{m}$ while it measured by 28${\mu}{\textrm}{m}$ without compensation . Furthermore the standard deviation of machining errors was also reduced from 8${\mu}{\textrm}{m}$ to 2${\mu}{\textrm}{m}$.

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A Study on the Compensation of the Thermal Errors for Machine Tool (공작기계 열변위 보정에 관한 연구)

  • 이인재
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.673-678
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    • 2000
  • This paper presents an indirect compensation of thermal errors during machining, in which thermal error is modeled as a linear regression of temperatures measured at 4 specified positions. In this regression model, weighting coefficients of the measured temperatures were estimated by using the least square method. The grinding test with compensation, after 4-hour warming-up operation before the test, showed that the maximum machining error of the work pieces was reduced to 12${\mu}{\textrm}{m}$ while it measured 28${\mu}{\textrm}{m}$ without compensation. Furthermore the standard deviation of machining errors was also reduced from 8${\mu}{\textrm}{m}$ to 2${\mu}{\textrm}{m}$.

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A Study on the Design of Throw-away Cutting Tool System for Deep Grooving or Cut-off Machining (깊은 홈 및 절단가공용 드로우어웨이식 초경공구 시스템의 설계에 관한 연구)

  • Kim, Hyeung-Chul;Lee, Woo-Young;Namgung, Suk
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.1
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    • pp.123-130
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    • 1996
  • The procedure on the design of a new tungsten cabide throw-away cutting tool system for deep grooving or cut-off machining is suggested. For relieving the maximum stress level at the corner radius of the blade holder, the finite element method is used. Also the pulling test device is proposed for measuring the holding force of the insert between the blade holder and the insert considering the materials in contact and configuration parameters of the holder.

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Mechanical Characteristic Evaluation of Proper Material for Ultra-fine Dies (초소형 금형소재의 기계적 특성평가)

  • KANG Jae-hoon;LEE Hyun-yong;LEE Nak-kyu
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2005.05a
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    • pp.473-476
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    • 2005
  • Today's manufacturing industry is facing challenges from advanced difficult-to-machine materials (WC-Co alloys, ceramics, and composites), stringent design requirements (high precision, complex shapes, and high surface quality), and machining costs. Advanced materials play an increasingly important role in modem manufacturing industries, especially, in aircraft, automobile, tool, die and mold making industries. The greatly-improved thermal, chemical, and mechanical properties of the material (such as improved strength, heat resistance, wear resistance, and corrosion resistance), while having yielded enormous economic benefits to manufacturing industries through improved product performance and product design, are making traditional machining processes unable to machine them or unable to machine them economically. In this paper, mechanical characteristic evaluation test of fine powder type WC-Co alloy was accomplished to obtain clear data for miniaturized special die parts machining with high reliability and high quality.

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Corrosion Behavior of AZ31 Magnesium Alloy during Machining (AZ31 마그네슘 합금의 절삭가공과정에서의 부식거동)

  • Kim, Jae-Hak;Kwon, Sung-Eun;Lee, Seung-Jae
    • Journal of the Korea Institute of Military Science and Technology
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    • v.15 no.3
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    • pp.315-321
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    • 2012
  • In the study, corrosion characteristics of AZ31 magnesium alloy under various environments exposed during machining(immersion in cutting oil, 5 % cutting oil aqueous solution and distilled water & contact with dissimilar metals, SPC4 and A5052-H32) were investigated. A corrosion test was performed AZ31 magnesium alloy was immersed in each electrolyte solution after contacting with each dissimilar metals, and the results were observed by an electron microscope. In immersion tests, corrosion of AZ31 magnesium alloy showed to be in the sequence of distilled water> 5 % cutting oil aqueous solution> cutting oil> air, and in the test of contact with dissimilar metals, corrosion showed to be in the sequence of SPC4> A5052-H32> AZ31. It can be concluded that to prevent corrosion during machining, AZ31 magnesium alloy must prevent contacting water and use magnesium alloy for raw material of Jig & Fixture.

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.

A Study on the Improvement of Noise Performance by Optimizing Machining Process Parameters on Ball Screw (가공최적화를 통한 볼 스크류의 소음성능 향상에 관한 연구)

  • Xu, Zhezhu;Choi, Jong-Hun;Kim, Hyun-Ku;Shin, Joong-Ho;Lyu, Sung-Ki
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.1
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    • pp.54-61
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    • 2011
  • Ball screw systems are largely used in industry for motion control and motor applications. But the problem of noise, which really perplexes us, is highly correlated with the quality in ball screw systems all the way. In this paper, machining process parameters were evaluated in respects of technique, business, produce and quality to verify which impact influences the noise most. In order to adjust and compare, two comparison groups were set with the present parameters bench mark. Different ball screws were produced as specimens for the noise tests. Through comparing the noise performance of different parameters in the machining process respectively, a group of optimized machining process parameters were obtained. Another noise test was proceeded to know how noise performance was improved by optimizing the machining process parameters. At last, surface roughness tests have been done to know how surface roughness improved by optimization. The improvement of surface roughness is the main factor influences the noise performances.

Stability Design of a Machining Center for Ceramic Materials (세라믹 가공 장비(MCT)의 구조 안정화 설계)

  • Yoon, Jae Hoon;Han, Dae Sung;Yoon, Hyun Jin;Yi, Il Hwan
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.3
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    • pp.133-139
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    • 2019
  • The utilizations of ceramics in the modern industries are increasing due to the desirable combinations of electrical, mechanical and physical properties found in ceramics. Ceramic materials are brittle, hard, strong in compression, weak in shearing and tension which is prone to affect the defects such as scratch, crack and breakage during the machining. Generally, the defects of the ceramic machining are generated from the structural vibrations of the machine. In this study, the dynamic characteristics of a machining center for ceramic machining were investigated to analyze the structural vibrations for the improved stability. Frequency response test and computer simulation have been conducted for the analysis and the design improvement. The improved design is suggested to suppress vibrations for the higher stability of the machine and further to reduce vibrations. And the result shows that simple design alterations without any change of major parts of the machine can reduce the vibration of the machine effectively.

Automatic Generation of Machining Sequence for Machined Parts Using Machining Features (특징형상을 이용한 절삭가공부품의 가공순서 자동생성)

  • Woo, Yoonhwan;Kang, Sangwook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.2
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    • pp.642-648
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    • 2016
  • As 3D solid modeling prevails, a range of applications have become possible and intensive research on the integration of CAD/CAM has been conducted. As a consequence, methods to recognize the machining features from CAD models have been developed. On the other hand, generating a machining sequence using the machining features is still a problem due to a combinatorial problem with a large number of machining features. This paper proposes a new method that utilizes the precedence constraints through which the number of the combinations is reduced drastically. This method can automatically generate machining sequences requiring the lowest amount of machining time. An airplane part was used to test the usefulness of the proposed method.