• Title/Summary/Keyword: Injection Molding

Search Result 1,555, Processing Time 0.034 seconds

Mechanical Properties of Stabilizer Link Using Composite Material and Metal (금속과 복합재료를 이용한 스태빌라이저 링크의 기계적 특성 평가)

  • Woo, Young-Man;Nam, Ki-Woo
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.35 no.8
    • /
    • pp.877-882
    • /
    • 2011
  • Stabilizers are balancing equipment that can reduce the severe rolling of ships, vehicles, and aircraft. We manufactured a stabilizer link using a metal and a composite material with 25% POM-GF. We evaluated the strength of the stabilizer link via tensile, compressive, and ball-stud separation. The standard criteria were satisfied. Of four types of rod, knurled rod has the greatest strength. We improved the shape of the stabilizer-link body by a reanalysis of the injection molding.

The Production of Metal Matrix Composites by Using the EPC Process;Particle Behavior at Solid-Liquid Interface (소실모형주조법에 의한 금속기 복합재료의 제조;고액계면과 입자거동에 관하여)

  • Park, Jong-Ik;Kim, Young-Seob;Kim, Jeong-Min;Kim, Dong-Gyu
    • Journal of Korea Foundry Society
    • /
    • v.17 no.1
    • /
    • pp.93-99
    • /
    • 1997
  • A possibility of production of aluminium matrix composites by using the lost foam process was investigated. Silicon carbide particles, graphite particles, and stainless steel wires were used as reinforcement materials. The reinforcement materials were introduced to the polystyrene to form patterns via injection molding process. The results obtained from this experiment can be summarized as follows. In Al/SiCp system, the particles with the radius of $100{\mu}m$ and over were entrapped in the matrix in the case of upward freezing of which solidification direction was opposite to floating direction of the particles. And few particles were entrapped in the matrix in downward freezing. In Al/graphite system, almost no particles were entrapped in the matrix except the area chill attatched. When the thickness of polystyrene slice was 4mm in Al/stainless steel wire system, the floating tendency of fibers was observed to increase as the distance from the ingate was increased.

  • PDF

Mechanical and Thermal Properties of Polypropylene/Wax/MAPP Composites Reinforced with High Loading of Wood Flour

  • Lee, Sun-Young;Kang, In-Aeh;Doh, Geum-Hyun;Mohan, D. Jagan
    • Journal of the Korean Applied Science and Technology
    • /
    • v.24 no.4
    • /
    • pp.416-426
    • /
    • 2007
  • Polypropylene (PP) composites with wood flour/wax/coupling agent were manufactured by melt compounding and injection molding. The influence of wood flour(WF), wax, and coupling agent on the mechanical and thermal properties of the composites was investigated. The addition of wood flour to neat PP has the higher tensile modulus and strength compared with neat PP. The presence of wax also improved the tensile modulus. At the same loading of PP and WF, the addition of coupling agent highly decreased the tensile modulus, and increased the tensile strength. From thermogravimetric analysis (TGA), the addition of wax improved the thermal stability of the composites in the later stages of degradation. The presence of MAPP and wood flour in turn decreased thermal stabilities of composites. From differential scanning calorimetry analysis (DSC), neither the loading of wax. nor the presence of MAPP has shown significant effect on the thermal transition of composites.

Effects of CMP Retaining Ring Material on the Performance of Wafer Polishing (CMP용 리테이닝 링의 재질이 웨이퍼의 연마성능에 미치는 영향)

  • Park, Ki-Won;Kim, Eun-young;Park, Dong-Sam
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.19 no.3
    • /
    • pp.22-28
    • /
    • 2020
  • This paper investigates the effects of retaining ring materials, particularly PPS and PEEK, used in the CMP process, on wafer polishing and ring wear. CMP can be performed using bonded type retaining rings made with PPS or injection molding type retaining rings made with PEEK. In this study, after polishing a wafer with a PPS retaining ring, the average profile height of the wafer was 0.098 ㎛ less than that of the wafer polished with a PEEK retaining ring, implying that PPS retaining rings achieve a higher polishing rate. In addition, the center area of the wafer profile had less deviation and improved flatness after polishing with the PPS ring. These results indicate that a higher polishing rate and smaller profile height deviation can be achieved using retaining rings made with PPS compared to retaining rings made with PEEK. Therefore, with semiconductor circuit patterns becoming finer and wafer sizes becoming larger, the use of PPS in CMP retaining rings can obtain more stable wafer polishing results compared to that of PEEK.

Theoretical Estimation of Machined Surface Profile by Tool Alignment Errors in Ball-End Milling (볼 엔드밀링에서의 공구 정렬 오차에 의한 가공면의 이론적인 평가)

  • Shin Y.J.;Park K.T.;Lee J.H.;Kang B.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2006.05a
    • /
    • pp.627-628
    • /
    • 2006
  • High speed milling process is emerging as an important fabrication process benefits include the ability to fabricate micro and meso-scale parts out of a greater range of materials and with more varied geometry. It also enables the creation of micro and meso-scale molds for injection molding. Factors affecting surface roughness have not been studied in depth for this process. A series of experiments has been conducted in order to begin to characterize the factors affecting surface roughness and determine the range of attainable surface roughness values for the high speed milling process. It has previously been shown that run-out creates a greater problem for the dimensional accuracy of pans created by high speed milling process. And run-out also has a more significant effect on the surface quality of milled parts. The surface roughness traces reveal large peak to valley variations. This run-out is generated by spindle dynamics and tool geometry. In order to investigate the relationship between tool alignment errors and surface roughness the scallop generating mechanism in the ball-end milling with tool alignement errors has been studied and simulated. The results indicate that tool alignment errors have no significant effects ell the dimension of scallops in for flat planes.

  • PDF

A Study on Manufacturing Resin-based Blow Mold using SLS Parts and Forming Prototype-car Parts (SLS 조형품을 이용한 수지형 블로우 몰드 제작 및 시작차 부품성형에 관한 연구)

  • 양화준;황보중;이석희
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.17 no.7
    • /
    • pp.124-131
    • /
    • 2000
  • Rapid Prototyping(RP) models are no longer used only for design verification. Currently, parts built utilizing layer manufacturing technology can be employed as functional prototypes and as patterns or tools for different manufacturing processes such as vacuum casting, investment casting, injection molding, precise casting and sand casting. This trend of Rapid Prototyping application meets the requirement of concurrent engineering and its range covers a more spreaded area. The aim of this paper is saving the manufacturing lead time and cost of plastic parts having hollow space shapes used by prototype-car. Using rapid prototype patterns, made by the Selective Laser Sintering(SLS) technique, a new approach of manufacturing resin-based blow mold is discussed. It has a great potential fur making prototype-car parts with the batch size of under 200 parts, in case of rapid modification due to a subsequent design changes in developing stage. So, the process proposed in this research shows reduction of process time and manufacturing cost when compared with the conventional process such as a Zinc Alloy fur Stamping(ZAS) mold.

  • PDF

Nondestructive Evaluation of the Defects in Composite-sintered Bushes Using Ultrasonics

  • Im, Kwang-Hee;Kim, Ki-Youl;Shin, Ki-Taek;Lee, Han-Hee;Jung, Il-Woong;Kang, To;Cho, Hyun-Joon
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.21 no.6
    • /
    • pp.1013-1017
    • /
    • 2012
  • Advanced composite-sintered bushings are widely utilized in the areas of excavators and injection molding machines as a journal bearing. Since the bearings are mainly used under high loads, service life should be long and the stored oil of inner bushings has to be continually fed into the bearing. The composite-sintered bushings are consisted of the two different materials; outer steel materials and inner porous sintered materials respectively. High temperature diffusion bonding has been applied for holding the both materials of the bushing together. Therefore, it is very important that the bonding reliability has to be assured and evaluated in manufacturing process. Finite element method (FEM) is performed in order to evaluate the minimum allowable flaw sizes that are possibly generated in the composite-sintered bushings. Additionally, the composite-sintered bushings were undergone ultrasonic C-scan tests to find out the size of inherent flaws through artificially simulated UT signal analysis.

Development of Simulation Model for Trajectory Tracking on Hydraulic System (유압시스템의 궤적 추종 시뮬레이션 모델 개발)

  • Choi, Jong-Hwan
    • 한국금형공학회:학술대회논문집
    • /
    • 2008.06a
    • /
    • pp.61-66
    • /
    • 2008
  • The hydraulic system have been used much in a heavy machine which high power source is desired. In the case of the heavy press machine and the injection molding machine, the use of the hydraulic power is essential especially for increasing productivity and getting the good products. Because the hydraulic circuit is very complex and the system parameters are uncertain, the development of the simulation model for hydraulic system is not easy in the heavy machine. In this case, Many researchers have used a commercial program for analysis and development in a major field of study. In this paper, the aim is to develop the simulation model of the hydraulic system with various commercial program for trajectory tracking. And adaptive control method is applied to the simulation model for the trajectory tracking of a cylinder motion. Load on the cylinder is modeled in ADAMS program, the hydraulic circuit including pump, spool valve and cylinder is modeled in AMESim program and a controller is designed in MatLab/simulink program. The suggested model is applied for the tracking of a cylinder motion, and through computer simulation, its trajectory tracking performance is illustrated.

  • PDF

Determination of mass flow rate, jet temperature and heating time in mold surface heating technology using hot jet impingement (고온제트에 의한 금형표면 가열기법에서의 유량, 온도, 가열시간의 결정)

  • Choi, Sung-Ju;Yoo, Young-Eun;Kim, Sun-Kyoung
    • 한국금형공학회:학술대회논문집
    • /
    • 2008.06a
    • /
    • pp.135-139
    • /
    • 2008
  • Development of surface heating technology using hot jet impingement onto mold inner surface for improvement of pattern transcription. This study is focused on how to control the parameters related to hot jet impingement. The mass flow rate, the jet temperature and the duration of the impingement are major parameters. The nozzle design and other geometric configurations also affect the heat transfer to the surface. In terms of heat transfer analysis, the most important number is the heat transfer coefficient, which is influenced by the mass flow rate, nozzle design, distance between the nozzle tip and the surface. In summary, several parametric studies using the developed model are conducted to investigate the effects of mass flow rate, jet temperature and Heating Time in Surface heating technology using hot jet impingement onto mold.

  • PDF

Design and fabrication of wafer scale microlens array for image sensor using UV-imprinting (UV 임프린팅을 이용한 이미지 센서용 웨이퍼 스케일 마이크로렌즈 어레이 설계 및 제작)

  • Kim, Ho-Kwan;Kim, Seok-Min;Lim, Ji-Seok;Kang, Shin-Ill
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2007.10a
    • /
    • pp.100-103
    • /
    • 2007
  • A microlens array has been required to improve light conversion efficiency in image sensors. A microlens array can be usually fabricated by photoresist reflow, hot-embossing, micro injection molding, and UV-imprinting. Among these processes, a UV-imprinting, which is operated at room temperature with relatively low applied pressure, can be a desirable process to integrate microlens array on image sensors, because this process provides the components with low thermal expansion, enhanced stability, and low birefringence, furthermore, it is more suitable for mass production of high quality microlens array. In this study, to analyze the optical properties of the wafer scale microlens array integrated image sensor, another wafer scale simulated image sensor chip array was designed and fabricated. An aspherical square microlens was designed and integrated on a simulated image sensor chip array using a UV-imprinting process. Finally, the optical performances were measured and analyzed.

  • PDF