• Title/Summary/Keyword: Machining Test

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A Study on Machining Effects on Residual Stress at Dissimilar Metal Weld Region (기계가공이 이종용접부의 잔류응력에 미치는 영향에 관한 연구)

  • Lee, Kyoung-Soo;Lee, Jeong-Geun;Lee, Seong-Ho;Park, Chi-Yong;Lee, Seung-Geon;Park, Jai-Hak
    • Journal of Welding and Joining
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    • v.29 no.2
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    • pp.56-63
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    • 2011
  • his paper aimed to understand the residual stress in the dissimilar metal welds of nuclear power plant. Two kinds of residual stress were considered, which caused by welding and machining. Residual stress due to mechanical machining was measured by hole-drilling technique and x-ray diffraction method for the SA508 and F316L. Weld residual stress at dissimilar metal weld between SA508 and F316L was evaluated by FEA. Residual stress profiles were obtained for the inside surface and through thickness of welds. Machining effect was also analyzed by FEA. According to the residual stress measurement, it was observed that mechanical machining can generate tensile stress on the surface of the test material. However, FEA results showed that mechanical machining did not increase the tensile stress on the surface of weld region. Further study with more elaborate measurement and numerical analysis is required to identify the effect of machining on residual stress in the dissimilar metal weld region.

Characterization of machining quality attributes based on spindle probe, coordinate measuring machine, and surface roughness data

  • Tseng, Tzu-Liang Bill;Kwon, Yongjin James
    • Journal of Computational Design and Engineering
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    • v.1 no.2
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    • pp.128-139
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    • 2014
  • This study investigates the effects of machining parameters as they relate to the quality characteristics of machined features. Two most important quality characteristics are set as the dimensional accuracy and the surface roughness. Before any newly acquired machine tool is put to use for production, it is important to test the machine in a systematic way to find out how different parameter settings affect machining quality. The empirical verification was made by conducting a Design of Experiment (DOE) with 3 levels and 3 factors on a state-of-the-art Cincinnati Hawk Arrow 750 Vertical Machining Center (VMC). Data analysis revealed that the significant factor was the Hardness of the material and the significant interaction effect was the Hardness + Feed for dimensional accuracy, while the significant factor was Speed for surface roughness. Since the equally important thing is the capability of the instruments from which the quality characteristics are being measured, a comparison was made between the VMC touch probe readings and the measurements from a Mi-tutoyo coordinate measuring machine (CMM) on bore diameters. A machine mounted touch probe has gained a wide acceptance in recent years, as it is more suitable for the modern manufacturing environment. The data vindicated that the VMC touch probe has the capability that is suitable for the production environment. The test results can be incorporated in the process plan to help maintain the machining quality in the subsequent runs.

A Study on the Development and Precise Performance Test of a Screw Type Flowmeter (스크류 유량계의 개발 및 정밀 성능평가에 관한 연구)

  • Hwang, Jong-Dae;Oh, Ji-Young;Jung, Yoon-Gyo;Lee, Sang-Ryul
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.5
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    • pp.87-95
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    • 2009
  • This research introduces the efficient modeling and manufacturing method using reverse engineering combined with rotational simulation of a pair of screw and mill-turn machining realized a proposed NC program. Because previously developed model had insufficient flow measuring accuracy, we considered that matter in the aspect of method of modeling and performance test. For that reason we modified the modeling which could minimize a gab between male and female screw, and developed precise tester which consists of constant tank, flowmeter and load cell, etc., and then conducted the test for defining characteristic and accuracy of flowmeter and repeated same test 5-times. Consequently we could obtain satisfied measuring accuracy and reproducibility indicated in the catalog of master model. Hence we give our conclusion as to the validity of developing accurate screw type flowmeter using the proposed process such as reverse engineering, mill-turn machining and precise performance test.

Predicting Cutting Forces in Face Milling with the Orthogonal Machining Theory (2차원 절삭이론을 이용한 정면밀링 절삭력 예측)

  • 김국원
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.12
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    • pp.150-157
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    • 2002
  • This paper presents an effective cutting force model that enable us to predict the instantaneous cutting force in face milling from a knowledge of the work material properties and cutting conditions. The development of the model is based on the orthogonal machining theory with the effective rake angle which is defined in the plane containing the cutting velocity and chip flow vectors. Face milling testes are performed at different feeds and, a fairly good agreement is shown between the predicted cutting forces and test results.

Predicting cutting forces in face milling with the orthogonal machining theory

  • Kim Kug Wean
    • International Journal of Precision Engineering and Manufacturing
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    • v.6 no.3
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    • pp.13-18
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    • 2005
  • This paper presents an effective cutting force model that enables us to predict the instantaneous cutting force in face milling from knowledge of the work material properties and the cutting conditions. The development of the model is based on the orthogonal machining theory with the effective rake angle, which is defined in the plane containing the cutting velocity vector and the chip flow vector. Face milling tests are performed at different feeds and, a fairly good agreement is shown between the predicted cutting forces and the test results.

Determining machining configuration for NC machining of free surfaces (자유곡면 가공을 위한 Machining configuration 결정에 관한 연구)

  • 강재관;서석환
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10a
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    • pp.1084-1089
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    • 1992
  • Process planning is a key feature that an intelligent CAD/CAM system should possess. In this paper, we address the problem of determinig process configuration to manufacture the free surfaces. For analyzing the surface, the method of surface subdivision is used. The developed algorithm evaluates the processability of the given surface by applying the three/four/five-axes procedures sequentially. To illustrate and test the developed algorithm, numerical simulations are presented.

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A Study on the efficiency test of Electric Discharge Machine Wire using Image processing (화상처리를 이용한 방전와이어의 성능평가에 대한 연구)

  • 배진한;이위로;유송민
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.10a
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    • pp.117-122
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    • 2002
  • Electrical discharge machining uses thermal energy from electrical discharge, while wire electrical discharge machining (WEDM) technology is widely used in conductive material machining. This paper proposes a method for evaluating the characteristics of wires in WEDM. In order to evaluate the wire processing performance, processing speed and roughness, straightness, corner processing have been assessed with precision experiment equipment and image processing including Laplacian filtering with various threshold levels.

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Development of Geometry Design S/W using Analysis on Machining Characterization considering EndMill Geometry (엔드밀 형상에 따른 가공특성 분석을 이용한 형상설계 S/W 개발)

  • 한창규;고성림;유중학;서천석;김경배
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.04a
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    • pp.111-117
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    • 2004
  • The tool geometry parameters and cutting process have complex relationships. Until now, various cutting test were needed to acquire optimal design of end mill for the purpose of high speed machining, due to the insufficient knowledge about cutting process. In high speed machining. Using various tools with different geometry, relationships between tool geometry parameter (rake angle, clearance angle, length of cutter) and cutting process (cutting force, surface accuracy, surface roughness) have been studied. Acquired data can be used to design optimal tool for high speed machining and developed tool geometry design S/W.

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A Study of Machining Error Due to Tool Deflection in Micro Endmilling (마이크로 엔드밀링시 공구 변형이 가공오차에 미치는 영향에 관한 연구)

  • Seo, Tae-Il;Sohn, Jong-In;Lee, Hak-Yong
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.18 no.3
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    • pp.294-299
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    • 2009
  • Micro end-milling has been becoming an important machining process to manufacture a number of small products such as micro-devices, bio-chips, micro-patterns and so on. Many related researches have given grand effects to micro end-milling phenomenon, for example, micro end-milling mechanism, cutting force modeling and machinability. This paper strongly concerned actual problem, micro tool deflection, which causes excessive machining errors on the workpiece. Machining error were predicted and measured through a series of test micro cutting and analysis of their SEM images and FEM analysis. Experiments are carried out to validate the approaches.

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