• Title/Summary/Keyword: Testing Machine

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A Study on Hot Deformation Behavior of Bearing Steels (베어링강의 고온변형 특성에 관한 연구)

  • Moon, Ho-Keun;Lee, Jae-Seong;Yoo, Sun-Joon;Joun, Man-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.4
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    • pp.614-622
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    • 2003
  • In this paper, the stress-strain curves of bearing steels at hot working conditions are obtained by hot compression test with a computer controlled servo-hydraulic Gleeble 3800 testing machine and elongations and reductions of area of the bearing steels are also obtained by hot tensile test with a Gleeble 1500 testing machine. Experiments are conducted under the various strain-rates and temperatures and their results are used to obtain the flow stress information. A rigid thermo-viscoplastic finite element method is applied to the multi-stage hot forging process in order to predict temperature distribution of workpiece. The experimental results and the analysis results are used to obtain an optimal hot forging condition.

AN EXPERIMENTAL STUDY ON PIN RETENTION OF THE DENTAL CEMENTS (치과용(齒科用) Cement가 Pin Retention에 미치는 영향(影響)에 관(關)한 실험적(實驗的) 연구(硏究))

  • Kim, Sung-Kan
    • The Journal of Korean Academy of Prosthodontics
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    • v.13 no.1
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    • pp.23-26
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    • 1975
  • The purpose of this study was to measure the retentive force of various kinds of dental cement. Cross-cutting the half of the occlusal surface, pinholes were prepared on the dentin with No. 557 carbide bur. No. 557 steel burs were cemented in the pinholes and retentive force was measured by removing the burs with Instron testing machine. The Instron testing machine was operated at a rate of 0.2 cm per minute. The following results were obtained : 1. The retentive force of zinc phosphate cement(A), reinforced zinc oxide and eugenol cement and polycarboxylate cement were similar to each other, but that of zinc phosphate cement (A) was the highest of all. 2. The retentive force of zinc phosphate cement (B) was the lowest of all.

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Ride Quality of a Passenger Car with Nonlinear Suspension System (현가장치의 비선형성을 고려한 승용차의 승차감 해석)

  • Cho, Sung-Jin;Choi, Yeon-Sun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.838-843
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    • 2005
  • The nonlinear characteristics of a suspension is directly related to the ride quality of a passenger car. In this study, a dynamic experiment for a spring and a damper of a passenger car is performed to analyze the nonlinear characteristics using MTS 1-axial testing machine and a mathematical nonlinear dynamic suspension model based on experimental data is devised to estimate the ride quality using Billings' method. The devised nonlinear model is applied to the ride quality analysis using K factor and the effect of suspension parameters is examined. As a result, the friction between the cylinder and the piston of a damper is the most effective parameter for the ride quality of a passenger car.

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Development of teaching material of material mechanics and portable material testing machine for convergence education of mechanical engineering (기계공학의 융합교육을 위한 재료역학 교재 및 휴대용 재료시험기 개발)

  • Cho, Seunghyun;Lee, Soonah
    • Journal of Engineering Education Research
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    • v.21 no.4
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    • pp.20-27
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    • 2018
  • In this paper, we conducted an analysis of existing materials of material mechanics, surveying educational demands, and selecting art fields for mechanical engineering in collaboration with experts in the fields of aesthetics and renaissance in order to develop educational materials conversed with humanities and arts. In addition, as a core education tool for convergence education, it was developed with an education kits that can be disassembled, assembled and carried by students. As a results of research, education materials were introduced various arts, linked to the engineering thinking. And measurement experiments of material characteristics were carried in a general classroom using developed education kits. From a paper results, the artistic sensitivity of the students will be enhanced and the students' creative problem solving ability will be improved as the ultimate goal of convergence education.

Design, Manufacture and Testing of the Hydraulic Coconut Dehusking Machine

  • Kwangwaropas, Nongkol
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 1993.10a
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    • pp.648-655
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    • 1993
  • The hydraulic coconut dehusking machine consists of three main parts ie. The frame , the power unit including the hydraulic accessories, the lifting and dehusking mechanisms. Two sets of the hydraulic coconut dehusking machine were developed . their hydraulic and electrical control circuits were connected in series to enable them operating contemporaneously. Two operators are required to operate the machine. Each of them put a coconut on the lifting mechanism in order to start the working cycle automatically. As a result, the nut are immediately pushed up and seized by the holding teeth under the supplement of the hydraulic reducing circuit. After that the dehusking mechanism started operating via the sequence circuit. At the end of the cycle, both mechanisms return to their original positions. Some remaining fibrous is taken out manually from the nut subsequently . The continuous dehusking speed was found to be 22.2 seconds per 2 coconuts.

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Determination of Optimal Adhesion Conditions for FDM Type 3D Printer Using Machine Learning

  • Woo Young Lee;Jong-Hyeok Yu;Kug Weon Kim
    • Journal of Practical Engineering Education
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    • v.15 no.2
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    • pp.419-427
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    • 2023
  • In this study, optimal adhesion conditions to alleviate defects caused by heat shrinkage with FDM type 3D printers with machine learning are researched. Machine learning is one of the "statistical methods of extracting the law from data" and can be classified as supervised learning, unsupervised learning and reinforcement learning. Among them, a function model for adhesion between the bed and the output is presented using supervised learning specialized for optimization, which can be expected to reduce output defects with FDM type 3D printers by deriving conditions for optimum adhesion between the bed and the output. Machine learning codes prepared using Python generate a function model that predicts the effect of operating variables on adhesion using data obtained through adhesion testing. The adhesion prediction data and verification data have been shown to be very consistent, and the potential of this method is explained by conclusions.

Study of the Development for Qualification of Occupational Category Combined Working and Learning -Oriented toward Mold & die in Machine Field- (일학습병행제 자격직종 개발에 관한 연구 -기계분야 금형직종을 중심으로-)

  • Kang, Seog Joo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.10
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    • pp.5925-5932
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    • 2014
  • The aim of this study was to develop assessment tools for analyzing society focusing on abilities, not an academic clique. The development of a type of occupational qualification, which is called a working and learning system, for Koreans, can be reliable and acceptable to a variety of society members. This study was conducted by searching for a dual system and examining a qualification system in developed countries. To achieve the goal of this study, the management status according to a type of qualification system was analyzed. In addition, a variety of related laws, related department, testing authority, testing institute, terms of applying for tests, way of testing, committee of testing, testing subjects, criterion for passing tests, a status of qualification test administrated in some developed countries, such as Germany, UK, the USA and Australia, were conducted. The occupational duty of the machine field and education contents are examined by analyzing the occupational duty. In addition, the criterion to solve problems and a way of marking in the field of machines were indicated and an example of written and practical tests is presented. This study makes a blueprint for a qualification system of working and learning at the same time in a national dimension.

A Token Based Transfer Driven Koran -Japanese Machine Translation for Translating the Spoken Sentences (대화체 문장 번역을 위한 토큰기반 변환중심 한일 기계번역)

  • 양승원
    • Journal of Korea Society of Industrial Information Systems
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    • v.4 no.4
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    • pp.40-46
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    • 1999
  • This paper introduce a Koran-Japanese machine translation system which is a module in the spoken language interpreting system It is implemented based on the TDMT(Transfre Driven Machine Translation). We define a new unit of translation so called TOKEN. The TOKEN-based translation method resolves nonstructural feature in Korean sentences and increases the quaity of translating results. In our system, we get rid of useless effort for traditional parsing by performing semi-parsing. The semi-parser makes the dependency tree which has minimum information needed generating module. We constructed the generation dictionaries by using the corpus obtained from ETRI spoken language database. Our system was tested with 600 utterances which is collected from travel planning domain The success-ratio of our system is 87% on restricted testing environment and 71% on unrestricted testing environment.

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Dynamic Tensile Characteristics of the High Strength Steel Sheet for an Auto-body (차체용 고장력 강판의 동적 인장 특성 평가)

  • Kim, Seok-Bong;Huh, Hoon;Shin, Chirl-Soo;Kim, Hyo-Kun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.1
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    • pp.171-176
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    • 2007
  • An important challenging issue in the automotive industry is the light-weight, safe design and enhancement of crash response of an auto-body structures. These objectives lead to increasing adoption of high strength steel sheet for inner and outer auto-body members. This paper evaluates the dynamic tensile characteristics of high strength steel sheets, HS45R, TRIP60, DP60 and DP100, along the rolling direction and transverse direction. Static tensile tests were carried out at the strain rate of 0.003/sec using the static tensile machine (Instron 5583). Dynamic tensile tests were carried out at the range of strain rate from 0.1/sec to 200/sec using a high speed material testing machine developed. The tensile tests acquire stress-strain relation and strain rate sensitivity of each material. The experimental results show two important aspects for high strength steels: the flow stress increases as strain rate increases; the strain hardening decreases as the tensile stress increases. The experiments also produce interesting results that the elongation does not decrease even when the strain rate increases.

Structural Analysis of a Carriage Shuttle System : A Material Supply Device for Small-Scale Machine Tools (소규모 공작기계용 소재공급장치의 이송 셔틀 시스템에 관한 구조해석)

  • Kang, Dae-Sung;Jung, Eun Ik;Kim, Kyung-Heui;Baek, Il-Cheon;Yi, Chung-Seob
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.4
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    • pp.62-68
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    • 2019
  • The aim of this study was to interpret the structure and dynamics of a transfer shuttle system as a material supply device for small machine tools. The following conclusions were obtained by performing a structural interpretation of the material supply equipment with respect to workload and the dynamical interpretation of a flexible multibody carriage shuttle. When a 1,000-kg workload was applied to a fork lift, the safety factor was approximately 1.86. To conservatively assess the integrity of the structure, a 1,000-kg workload would be proper. In the case of a deflection of the fork system, the width increased with increasing time. The greatest deflection occurred at 5.5 s, which was the largest increase in the time point of the fork system.