• Title, Summary, Keyword: injection depth

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A method of mold wall thickness design for a deep depth injection mold (깊이가 깊은 사출 금형의 측벽 설계 방법)

  • Hwang, S.J.;Lyu, M.Y.;Kim, D.W.;Kim, S.Y.;Shin, K.S.;Kim, K.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.301-304
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    • 2008
  • The cavity of mold is exposed to high pressure during injection molding operation. Injection molded articles with deep depth are often demanded as design variety increases. Mold becomes weak and deformation increases as the mold depth increases. Thus the injection molds for deep depth articles should be designed to hold out high pressure or stress and large deformation. Through this study, equation for mold design was examined and suggested novel method to determine equation for mold design with deep depth. Novel equation developed in this study was consisted with cantilever and two points bending while previous equation was modified from just cantilever bending. The validity of novel equation was verified through computer simulation.

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A Study on the Wall Thickness Design for Injection Molding (사출 금형의 벽두께 설계 방법의 고찰)

  • Hwang, S.J.;Lyu, M.Y.;Kim, D.W.;Kim, S.Y.;Shin, K.S.;Kim, K.Y.
    • 한국금형공학회:학술대회논문집
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    • pp.149-153
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    • 2008
  • The cavity of mold is exposed to high pressure during injection molding operation. Injection molded articles with deep depth are often demanded as design variety increases. Mold becomes weak and deformation increases as the mold depth increases. Thus the injection molds for deep depth articles should be designed to hold out high pressure or stress and large deformation. Through this study, equation for mold design was examined and suggested novel method to determine equation for mold design with deep depth. Novel equation developed in this study was consisted with cantilever and two points bending while previous equation was modified from just cantilever bending. The validity of novel equation was verified through computer simulation.

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A Study on the Novel Prediction of Mold Wall Thickness for a Deep Depth Injection Mold (깊이가 깊은 사출 금형의 새로운 측벽 두께 설계에 관한 연구)

  • Hwang, S.J.;Lyu, M.Y.
    • Transactions of Materials Processing
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    • v.17 no.7
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    • pp.528-533
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    • 2008
  • Cavity in the mold is exposed to high pressure during injection molding operation. Injection molded articles with deep depth are often demanded as design variety increases. Subsequently mold becomes weak and deformation increases as the mold depth increases. Thus the injection molds for deep depth articles should be designed to hold out high pressure or stress concentration and large deformation. Through this study, equation for mold design was examined and suggested novel method to determine equation for mold design with deep depth. Novel equation developed in this study was modified from beam theory considering cantilever and two points bending situation while previous equation was modified from just cantilever bending situation. The validity of novel equation was verified through computer simulations for various mold side and wall thickness.

A Study to Develop Optimal Injection System Using ISIS(the In-situ Soil Injection Simulator) (ISIS 시스템을 이용한 최적 그라우팅 시스템 개발 연구)

  • 천병식;김진춘;김경민;이민호;이정훈;김진수;박종근
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.619-626
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    • 2002
  • In this study, a correlation among pressure, time and quantity of injection was organized from the laboratory tests, which were executed many times representing in-situ soil conditions carefully and then it would be applied to the in-situ soil injection simulator which will be developed for optimal injection into the ground. The sort of sample soils were both sand(A specimen) and silty sand(B specimen). Injection tests were gone into operation by compaction state, injection velocity and the depth individually. In the ground improved with permeation Infection, the relation among injection pressure of the same depth, the injected quantities and time were systematic by the depth. By defining the limit range of injection pressure and quantity about the variety of a linear equation obtained from lining each of their trend, the application of laboratory injection monitoring program and the data to evaluate its realization were produced. In the ground improved with root type injection, the relation between injection pressure and the injected quantities was irregular because fracture state occurred quickly.

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Analysis of Influencing Factors to Depth of Epidural Space for Lumbar Transforaminal Epidural Block in Korean

  • Kim, Lee-Kyoung;Kim, Jung-Ryul;Shin, Sung-Sick;Kim, In-Ji;Kim, Bac-Ne;Hwang, Gan-Tac
    • The Korean Journal of Pain
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    • v.24 no.4
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    • pp.216-220
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    • 2011
  • Background: Transforaminal epidural steroid injection is one of the effective treatments in managing radicular pain. There have been some prospective studies on the depth to the epidural space with the transforaminal approach. However, there have been no studies about the depth in Asians, especially Koreans. This study was carried out in order to evaluate the depth to the epidural space and the oblique angle and factors that influence the depth to the epidural space during lumbar transforaminal epidural injection. Methods: A total of 248 patients undergoing fluoroscopically guided transforaminal epidural steroid injections were evaluated. At the L3-4, L4-5, L5-S1, and S1 levels, we measured the oblique angle and depth to the epidural space. Results: Needle depth was positively associated with body mass index (correlation coefficient 0.52, P = 0.004). The median depths (in centimeters) to the epidural space were 6.13 cm, 6.42 cm, and 7.13 cm for 50-60 kg, 60-70 kg, and 70-80 kg groups, respectively, at L5-S1. Age and height were not significantly associated with the needle depth. Conclusions: There is a positive association between the BMI (and weight) and transforaminal epidural depth but not with age, sex, and height.

Case Study of Flexural Strength Evaluation of Epoxy Injected Concrete Using Low Pressure Mixed with Mechanical High Pressure (기계식 고압과 저압을 혼용한 에폭시 주입 콘크리트의 휨강도 검토 사례 연구)

  • Hong, Ki-Nam;Yu, Yeon-Jong;Lee, Kang-Moon;Ryu, Chang-Yeol;Yoon, Hong-Su
    • Journal of the Korean Society of Safety
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    • v.27 no.1
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    • pp.49-54
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    • 2012
  • The objective of this study is to investigate the capacity of epoxy injection method using low pressure mixed with high pressure. Injection depth test and flexural strength test were respectively performed on $40{\times}45{\times}35$ cm and $100{\times}10{\times}40$ cm specimens. Considered as the test variables were injection type(low pressure, low and high pressure), crack width(0.25 mm, 0.50 mm), injection direction(upper, lower, side), and epoxy viscosity(low, medium, high). Test results showed that low viscosity epoxy injection depth of injector using low pressure mixed with high pressure for upper direction were 23 cm and tension strength of crack face repaired by injector using low pressure mixed with high pressure was larger than that of concrete.

Effects of Injection Conditions on the Weld Line Creation in Injection Molding (사출성형시 성형조건이 웰드라인의 생성에 미치는 영향)

  • Kim, Young-Mo;Park, Yeong-Min;Jang, Min-Kyu;Jeong, Yeong-Deug
    • 한국금형공학회:학술대회논문집
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    • pp.115-119
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    • 2008
  • Weld line in injection molded part is one of the defects in injection molding process. Weld line deteriorates not only appearance quality but mechanical property. In this study, ABS and PP were used as experimental materials. And weld line length, depth and strength have been examined according to the injection molding conditions. As the results of experimental studies, weld line length increased as flow rate increases for all materials. And the flow rate is most influenced to the creation of weld line length. Also weld line strength increased, as flow rate and melt temperature increase for all materials. The whole experiment results was similar to CAE analysis results.

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Effects of Injection Conditions on the Weld Line Creation in Injection Molding (사출성형 시 성형조건이 웰드라인의 생성에 미치는 영향)

  • Kim, Young-Mo;Park, Yeong-Min;Jang, Min-Kyu;Jeong, Yeong-Deug
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.6 no.2
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    • pp.1-5
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    • 2012
  • Weld line in injection molded part is one of the defects in injection molding process. Weld line deteriorates not only appearance quality but mechanical property. In this study, ABS and PP were used as experimental materials. And weld line length, depth and strength have been examined according to the injection molding conditions. As the results of experimental studies, weld line length increased as flow rate increases for all materials. And the flow rate is most influenced to the creation of weld line length. Also weld line strength increased, as flow rate and melt temperature increase for all materials. The whole experiment results was similar to CAE analysis results.

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Optimization of injection molding to minimize sink marks for cylindrical geometry (원통형 플라스틱 성형품의 싱크 마크를 최소화하기 위한 사출성형 조건의 최적화)

  • Kwon, Yun-Suk;Je, Duck-Keun;Jeong, Young-Deug
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.2 no.2
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    • pp.33-37
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    • 2008
  • This paper describes the optimization of injection molding conditions to minimize sink marks. Sink marks, which refer to a small depression on the surface opposite a thick wall thickness, are often encounted in injection molded plastic parts. Part geometry, material properties and processing conditions during injection molding can affect the sink mark depth. We designed the runner system which is possible balanced filling to cavities using CAE program and then obtained optimal processing conditions by Taguchi's Robust Design technique. By actual injection molding using optimized mold and molding conditions, it confirmed that sink mark depth decreased zero compared to 1mm level in the conventional mold and process.

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Optimization of Injection Molding to Minimize Sink Marks for Cylindrical Geometry (원통형 플라스틱 성형품의 싱크 마크를 최소화하기 위한 사출성형 조건의 최적화)

  • Kwon, Youn-Suk;Jeong, Yeong-Deug
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.7
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    • pp.111-115
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    • 2008
  • This paper describes the optimization of injection molding conditions to minimize sink marks. Sink marks, which refer to a small depression on the surface opposite a thick wall thickness, are often encounted in injection molded plastic parts. Part geometry, material properties and processing conditions during injection molding can affect the sink mark depth. We designed the runner system which is possible balanced filling to cavities using CAE program $Moldflow^{TM}$ and then obtained optimal processing conditions by Taguchi's Robust Design technique. By actual injection molding using optimized mold and molding conditions, it confirmed that sink mark depth decreased zero compared to 1mm level in the conventional mold and process.