• Title/Summary/Keyword: Mechanical parts

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Study of Parts Integration in Product Including Parts having Same Function (동일 기능을 갖는 부품들이 포함된 제품의 부품 통합에 관한 연구)

  • Choi, Jun Ho;Lee, Kun Sang
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.2
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    • pp.193-198
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    • 2013
  • In general, a product consists of one or more parts. Different parts of a product can perform the same function. According to "the design hypothesis of an integrated part", parts having the same function may be integrated into one part. A part can also perform more than one function. The form or material characteristic of a part may perform its function. In this study, we develop a method for defining the functions of components and for integrating parts having the same functions. We have successfully integrated some parts of a three-hole punch using the proposed method. The results satisfy axiomatic design.

Configuration Design of a Train Bogie using Functional Decomposition and TRIZ Theory (기능분해와 TRIZ 이론을 이용한 철도 대차의 구성설계)

  • Lee, Jangyong;Han, Soonhung
    • Journal of Korean Institute of Industrial Engineers
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    • v.29 no.3
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    • pp.230-238
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    • 2003
  • The configuration design of a mechanical product can be efficiently performed when it is based on the functional modeling. There are methodologies, which decompose function from the abstract level to the concrete level and match the functions to physical parts. But it is difficult to carry out an innovative design when the function is matched only to a pre-detined part. This paper describes the configuration design process of a mechanical product with a design expert system, which uses function taxonomy and TRIZ theory. The expert system can propose a functional modeling of a new part. which is not in the existing parts list. The abstraction levels of design knowledge are introduced, which describe the operation of mechanical product in the levels of abstraction. This is the theoretical background of using knowledge of function and TRIZ for configuration design. The expert system is adequate to control this design knowledge. which expresses knowledge of functional modeling, mapping rules between functions and parts, selection of parts, and TRIZ theory. The hierarchy of functions and machine parts are properly expressed by classes and objects in the expert system. A design expert system has been implemented for the configuration design of a train bogie, and a new brake system of the bogie is introduced with the aid of TRIZ's 30 function groups.

Statistical Analysis of Mechanical Parts Industry in Chungju Region (충주지역의 기계류 산업동향 통계분석)

  • Lee, Hyoung-wook;Park, Sung-jun
    • Journal of Institute of Convergence Technology
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    • v.2 no.2
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    • pp.55-58
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    • 2012
  • The strategic industry in Chungbuk province is the electric and electronic related industry. In the Chnugju region, the trend of major industry have change from the electric and electronic related industry to mechanical parts and components related industry include manufacturing of automobile and transportation. In this paper, we perform statistical analysis using the micro data service provided by the Statistics Korea, The CAGR of the number of employee and value-added value in the electric and electronic related industry during past 7 years are -7.1% and -13.2%, respectively while the CAGR in the mechanical parts related industry are 14.4% and 22.9%, respectively. However, value-added value per value of shipment of the mechanical related industry is lower than that of the electric and electronic related industry.

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저합금강판의 열간프레스성형에 따른 상변태 전산 해석

  • Bok, Hyeon-Ho;Kim, Hun-Dong
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2010.05a
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    • pp.39.2-39.2
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    • 2010
  • Recently, hot stamping process has been paid attention greatly by automobile makers in accordance with the fuel efficiency and environmental issues as well as crash safety issue. The hot-stamped parts, however, demand extreme mechanical properties such as tensile strength of over 1470 MPa or equivalently Vickers hardness of around 450. In this work, to meet the demand efficiently, a method to predict mechanical property of hot-stamped parts based on numerical phase transformation scheme has been proposed associated with the thermo-mechanical coupled finite element analysis. This work deals with various phase transformation equations and validates them to select appropriate model for 0.2C-0.1Si-1.4Mn-0.5Cr-0.01Mo-0.002B steel sheet. The authors show that an efficient method saving time and cost to develop hot-stamped automobile parts ensuring suitable mechanical properties such as Vickers hardness and strength.

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A study on measurement and compensation of automobile door gap using optical triangulation algorithm (광 삼각법 측정 알고리즘을 이용한 자동차 도어 간격 측정 및 보정에 관한 연구)

  • Kang, Dong-Sung;Lee, Jeong-woo;Ko, Kang-Ho;Kim, Tae-Min;Park, Kyu-Bag;Park, Jung Rae;Kim, Ji-Hun;Choi, Doo-Sun;Lim, Dong-Wook
    • Design & Manufacturing
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    • v.14 no.1
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    • pp.8-14
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    • 2020
  • In general, auto parts production assembly line is assembled and produced by automatic mounting by an automated robot. In such a production site, quality problems such as misalignment of parts (doors, trunks, roofs, etc.) to be assembled with the vehicle body or collision between assembly robots and components are often caused. In order to solve such a problem, the quality of parts is manually inspected by using mechanical jig devices outside the automated production line. Automotive inspection technology is the most commonly used field of vision, which includes surface inspection such as mounting hole spacing and defect detection, body panel dents and bends. It is used for guiding, providing location information to the robot controller to adjust the robot's path to improve process productivity and manufacturing flexibility. The most difficult weighing and measuring technology is to calibrate the surface analysis and position and characteristics between parts by storing images of the part to be measured that enters the camera's field of view mounted on the side or top of the part. The problem of the machine vision device applied to the automobile production line is that the lighting conditions inside the factory are severely changed due to various weather changes such as morning-evening, rainy days and sunny days through the exterior window of the assembly production plant. In addition, since the material of the vehicle body parts is a steel sheet, the reflection of light is very severe, which causes a problem in that the quality of the captured image is greatly changed even with a small light change. In this study, the distance between the car body and the door part and the door are acquired by the measuring device combining the laser slit light source and the LED pattern light source. The result is transferred to the joint robot for assembling parts at the optimum position between parts, and the assembly is done at the optimal position by changing the angle and step.

Study on Concept Design of the Motor Actuator of Outside Rear-View Mirror by Incomplete Coupled Design (불완전연성설계의 특성을 갖는 사이드미러 액추에이터의 개념설계에 관한 연구)

  • Choi, Jun-Ho;Lee, Kun-Sang
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.12
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    • pp.1843-1848
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    • 2010
  • This paper presents an analysis of the design hypothesis of integration of parts from the viewpoint of axiomatic design. In parts integration, parts with the same functions are integrated into a single part. For the analysis, a motor actuator of an outside rear-view mirror with the type of an uncoupled design was used. The parts within the actuator are checked for determining the possibility of integration, by adopting the design hypothesis of integration of parts. The design hypothesis of integration of parts is based on a type of coupled design. However, the type of incomplete coupled design that resembles the type of an uncoupled design would be better than the type of a coupled design.

A Study on the Accelerated Life Test of Rubber Specimens by using Stress Relaxation (응력완화를 이용한 고무시편의 가속수명시험 연구)

  • Lee, Su-Yeong;You, Ji Hye;Lee, Yong-Sung;Kim, Hong Seok;Cheong, Seong-Kyun;Shin, Ki-Hoon
    • Journal of the Korean Society of Safety
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    • v.31 no.1
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    • pp.19-24
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    • 2016
  • Rubber parts are widely used in many applications such as dampers, shock absorbers, and seals used in railway and automotive industries. Much research has thus far been conducted on property estimation and life prediction of rubber parts. To predict the service life of rubber parts at room temperature, most prior work adopts the well-known Arrhenius model that needs the accelerated life test in high-temperature conditions. However, they may not reflect the actual conditions of use that rubber parts are usually used under a specific strain condition during long period of time. In this context, we propose a method for the life prediction of rubber parts in actual conditions of use. The proposed method is based on the accelerated life test using stress relaxation during which three relatively high elongation percentages (100%, 200%, and 300%) are applied to the rubber specimens. Rubber specimens were prepared in accordance with KS M 6518 standard and three stress relaxation testers were fabricated for actual experiments. Finally, a inverse power model for life prediction was derived from experimental results. The predicted life was compared with the actual test life for validation.

System Selection Assistant based on Fuzzy Logic (퍼지 로직에 의한 최적 시스템 요소 선택)

  • Balashov, Vadim S.;Skatova, Darya D.;Choe, Seong-Ju;Jo, Hyeon-Chan
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 2007.04a
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    • pp.221-224
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    • 2007
  • This report contains information about "System Selection Assistant"(SSA) - Program, which can help customers of manufacturing company to select optimal electro-mechanical system for their purposes. This Program shows main principles of programs, which can help to make decision, using knowledge of experts. Program consists of two main parts: "Expert's part" must be tuned by expert and "Customer's part" can be used to make final decision about optimal parts of system. This report describes all parts of SSA program and shows simple example of selection parts of electro-mechanical system.

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A Study on Material Charaterization and Mechanical Properties of SMC Compression Molding Parts (SMC 압축성형재의 기계적 물성 및 특성에 관한 연구)

  • 김기택;정진호;임용택
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1994.03a
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    • pp.139-148
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    • 1994
  • An experimental study on material characterization and mechanical properties of SMC(Sheet Molding Compounds) compression molding parts was carried out. Simple compression test using grease oil as a lubricant was carried out to characterize flow stress of SMC at elevated temperatures. Two different mold temperatures, 130$^{\circ}C$ and 150$^{\circ}C$ and two different mold speeds, 15, 45mm/min were used for preparing the specimen of SMC compression molding parts. Surface roughness, tensile, and 3-point bending tests were used to determine the effects of molding temperatures and speeds on mechanical properties of compression molded SMC parts.

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Thixoforging Process and the Problems of Hollow Type Metal Matrix Composite Part (중공형 금속 복합 재료 부품의 Thixoforging 공정과 문제점)

  • 이승후;허재찬;강충길
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.808-811
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    • 1997
  • MMC has excellent mechanical properties in many ways in automotive industrial, and get into the spotlight as a light materials substituted for iron and steel. But the know-how about MMC research lack, MMC is expensive and difficult to apply the sound parts. Especially it is difficult to produce the hollow type parts composed with MMC. Therefore, hollow type parts of metal composites by using thixoforming process which as co-existing solidus-liquidus phase, it is very important to obtain forming condition. In this study, MMC billet producted by electro-magnetic stirring and mechanical stirring process is formed to hollow type parts of thixoforming process and inspected of suitability for application. It is optimized production condition, and applied to experiment. After variable materials were produced for thixoforming process, it were inspected of suitability for application by comparsion with mechanical properties. In this study, used materials were A357, A380 10%vol, and 20%vol SiCp, and the size of particultes were 14$\mu\textrm{m}$ and 5.5$\mu\textrm{m}$.

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