• Title/Summary/Keyword: 인출력

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Study on the Measurement of Restraining and Opening Forces in Drawbeads (드로우비드 상압력과 인출력 측정에 관한 연구)

  • Moon, S.J.;Keum, Y.T.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.203-206
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    • 2006
  • The drawbeads, which is used for controlling the flow of the sheet by imposing the tension and for preventing the springback in the sheet metal forming process, affects a lot the formability because of the differences in the restraint and opening forces according to the drawbead shapes and dimensions. In this study, the experimental device enabling to measure the drawbead restraining forces and the drawbead opening forces associated with various drawbead shapes and dimensions and their theoretical evaluation are introduced and verified through the experimental measurement of those of a circular drawbead.

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Study on the Characteristics of Drawbead Forces in Automotive Stamping Dies (자동차 스템핑 금형의 드로우비드력 특성에 관한 연구)

  • Moon, S.J.;Keum, Y.T.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.05a
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    • pp.431-433
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    • 2007
  • The drawbeads, which is used for controlling the flow of the sheet by imposing the tension and for preventing the springback in the sheet metal forming process, affects a lot the formability because of the differences in the restraint and opening forces according to the drawbead shapes and dimensions. In this study, the experimental device enabling to measure the drawbead restraining and opening forces was manufactured and the drawing forces of circular, square, and step drawbeads are measured. The drawbead restraining and opening forces of a circular drawbead are increased as its drawbead height is increased. Similarly, those of a square drawbead are increased as its height is increased and shoulder radii decreased. Also, those of a step drawbead are increased as its height and difference in their heights are increased.

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A Study on the Drawing characteristics of Sheet through Step Drawbead (계단형 드로오비드에 의한 판재의 인출특성에 관한 연구)

  • 박원배;김창만;김낙수;서대교;전기찬
    • Transactions of Materials Processing
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    • v.5 no.2
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    • pp.130-137
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    • 1996
  • The sheet formability can be improved by the optimum drawbeads installation because draw-beads can control the flow of the metal into the die cavity when the punch enters into the die opening, In this study the drawing characteristics for step drawbead are analyzed by 2-D rigid -plastic FEM and also are measured experimentally. In addition for the validity of FEM theoretical results are compared with the experimental results. Especially the draw bead restrain-ing forces and the strain distributions of drawn specimens are obtained in both FEM and experiment. Also the effects of the drawbead dimensions drawing angles and blank holding forces on the drawing characteristics are investigated.

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Experimental Model for Determining Drawbead Forces (드로우비드력 결정을 위한 실험모델)

  • Moon, S.J.;Lee, M.G.;Keum, Y.T.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.05a
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    • pp.217-219
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    • 2008
  • A new experimental model for determining drawbead forces, which modifies the dieface of Nine's experimental model, is introduced and the better validity of the drawbead opening and restraining forces of new model than those of Nine's is demonstrated. While Nine's model considers a blank holding force as one of forming variables, new model excludes it by removing blank holder in the dieface. The comparison of the strains found by FEM simulation of automotive fender draw forming process with those measured in a formed panel recommends the new model for accurate drawbead forces.

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Finite Element Analysis and Experimental Verification for the Drawing Characteristics Through Drawbeads (드로오비드 인출특성에 관한 유한요소해석 및 실험적 검증)

  • 김창만;임영석;서대교
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.8
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    • pp.1844-1853
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    • 1995
  • Theoretical and experimental drawing characteristics for the single circular and square drawbeads are discussed. During the blank holding process, the strain distributions of upper and lower skins of specimens, and the die reactional forces are analysed by F. E. M., and they are compared with the experimental results. The drawbead restraining forces and strain distributions for the drawn specimens by the various drawing length are also analysed and compared with the experimental results. It is concluded that the theoretical simulations and results could be very useful for the prediction of real cases.

A study on the drawing characteristics of circular drawbead by the Finite Element Method (유한요소법에 의한 원형드로오비드의 인출특성에 관한 연구)

  • 신양호
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.6 no.3
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    • pp.26-35
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    • 1997
  • In this study, the drawing characteristics of circular drawbead are examined with the plane strain elastic-plastic FE Method. Both the clamping load and the drawing load investigated by varying the process variables such as drawbead radius, closing depth and friction condition. The effective strain induced by the draw bead is also investigated. In order to verify the results, the computed results are compared with the existing experimental results. It has been found that both the clamping load and drawing loads are related with the geometry of the bead rather than the lubrication conditions.

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Long Life Design of SSD Test Gender by Reducing Ejecting Force (인출력 저감을 통한 SSD Test Gender의 장수명 설계)

  • Kim, Jae Kyung;Park, Hyung Suk;Lee, Ki Seok;Jeon, Euy sik
    • Journal of the Semiconductor & Display Technology
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    • v.19 no.4
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    • pp.139-144
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    • 2020
  • Recently, the electronic equipment industry has become active due to the continuous increase in portable storage media with high-speed information communication, and in particular, the production of SSD(Solid State Drives) for miniaturization of mobile devices and high-speed information communication has increased rapidly. When the SSD is ejecting in the SSD test gender, the necessary ejecting force must be kept constant to have a lifespan applicable to the test device. When the ejecting force increased, it leads to wear of the link for ejecting, which causes a problem in that repeated durability decreases and the ejecting of the SSD becomes impossible. In this paper, the repeated durability test analysis according to the material and the reducing ejecting force design were performed to increase the life of the test gender for SSD inspection. The wear level of the pusher head and ejector was analyzed through repeated durability tests according to the material of the pusher head. The validity of the design was verified through the ejecting force test and repeated durability test of the Test gender, which was designed by carrying out the design to reduce the size and ejecting force of the test gender.

Reflectivity of Sn-3.5Ag Solder for LED lead frame (LED 리드프레임을 위한 Sn-3.5Ag 솔더의 반사율)

  • Gi, Se-Ho;Xu, Zengfeng;Choe, Jeong-Beom;Kim, Won-Jung;Jeong, Jae-Pil
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2011.05a
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    • pp.192-192
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    • 2011
  • 본 연구에서는 LED lead frame을 위한 Sn-3.5Ag 솔더의 젖음 특성과 반사율에 관하여 조사하였다. 금속기판과 액체금속간의 젖음성은 wetting balance tester를 이용하여 평가하였으며, 최대인출력, 최대인출시간 등을 측정하고 표면장력을 계산하였다. Sn-3.5Ag 솔더를 $250{\sim}290^{\circ}C$의 온도에서 젖음성을 측정하였는데 온도가 증가함에 따라 젖음성이 향상되는 것을 확인할 수 있었다. 또한 솔더가 도금된 Cu-coupon의 반사율을 측정하였는데 $270^{\circ}C$에서 가장 높은 반사율을 나타냈다.

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Relationship Between Conversation Skills, Working Memory and Naming Ability in Aging Adults (노인의 대화기능과 작업기억력 및 이름대기 능력 간의 관련성 연구)

  • Mun, Jiyun;Son, Eunnam;Lee, Okbun
    • 재활복지
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    • v.22 no.4
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    • pp.103-121
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    • 2018
  • For knowing the effects of aging on conversational skills in daily communication, this paper studied for the conversational turn-taking skills, working memory and naming ability on healthy elderly adults over 65 ages. 85 elderly adults participated in this study, which divided into four groups by ages. Speech samples were collected in natural conversation. Memorization of numbers, mental calculation, repetition of words were administered for working memory test. K-BNT was used for the naming ability. One-way ANOVA analysis was used for the comparison of conversational turn-taking skills among four groups. We analyzed the correlation between conversational skills, working memory and naming ability. The results were as follows: first, there were a significant difference in conversational turn-taking skills by age, but not by gender. There was a significant difference in 'Turn-Taking Frequency' and 'Total Utterance Frequency' among four groups. The same results were shown in the scores of females within three groups(exclude groups over 85D)(p<.01). Second, there was a significant correlation between 'rates of maintenance' and 'naming ability'. In addition, it was found that the naming test predicted 'rates of maintenance' skills. The results of this study suggest that word-retrieval ability will be helpful to enhance functional communication skills in aging old adults.