• Title/Summary/Keyword: Injection method

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A study on the mold opening stroke according to the control method of the injection molding machine (사출성형기의 속도제어 방식에 따른 형개거리에 관한 연구)

  • Jung, Hyun-Suk;Lee, Chun-Kyu
    • Design & Manufacturing
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    • v.15 no.3
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    • pp.56-61
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    • 2021
  • The increase in automation facilities in the injection molding industry is a very important process control item. The most important item when constructing an unmanned machine using a take-out robot is the "mold opening stroke" of the mold. The injection molding machine control method is divided into hydraulic type and electric type, and there have been few studies on the mold opening distance according to the control method. In this study, the correlation was confirmed by increasing the injection speed to 20, 50, 80, and 100% for the three types of hydraulic control method, open loop and close loop, and electric control method. Through the experiment, the following results were obtained. (1) It can be seen that the reproducibility is excellent with the electric, close loop, and open loop control methods. (2) When the injection speed is set to 50%, the mold opening distance is 263.10~263.27 mm, which is the most reproducible. (3) As a result of ANOVA, both injection speed and mold opening distance showed a significant difference in the hydraulic control method (p<0.05), but it was verified through experiments that there was no significant difference in the electric control method. Based on these results, when electric control is selected rather than hydraulic control, the reproducibility of the mold opening distance is excellent, so it is thought that the taking-out robot can take the object out of the mold more safely.

A Study on Fuzzy Temperature Control for the Barrels of Injection Molding Machine using PC based PLC (PC 기반 PLC를 이용한 사출성형기 배럴의 퍼지 온도 제어에 관한 연구)

  • 김훈모
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.10
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    • pp.768-773
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    • 2003
  • Injection molding has been widely used for the mass production of a plastic product. With the development of the relative technique, various injection molding techniques have been developed and we could get more precise plastic product. The temperature of a melting resin is an important factor in the injection molding and this temperature has direct influence on the quality of a plastic product. In the present injection molding machine, the deriation of a temperature controlled by PID control method is within 2$^{\circ}C$ in the injection molding machine but PID control method takes too much time to stabilize after preheating and its overshoot is so big. We applied fuzzy control to alleriate the problem. In this research, we experimented the fuzzy temperature control with the usage of PC based PLC.

A Study on the Simulation of the Fuel Injection System in a Large Low-speed marine Diesel Engine (박용 대형 저속 디젤기관 연료분사계통의 시뮬레이션에 관한 연구)

  • 이창식
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2000.05a
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    • pp.36-44
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    • 2000
  • In his study the simulation was carried out by simplifing and modeling dividing into fuel injectioin pump high pressure pipe and fuel injection valve in the fuel injection system of a low speed marine diesel engine. A computer simulation model was developed using the method of characteristics to analyze the unsteady flow in the fuel injection system considering cavitation and variation of fuel density and bulk modulus. Comparison was commenced between the calculated data and experimental data of pressure and injection quantity at the high pressure distributor in fuel injection system for the training ship "M/V hanara" the effects of the high pressure pipe length diameter plunger diameter nozzle openning pressure were also investigated by simulating results.g results.

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A Study on Plastic Injection Molding for Warpage Characteristics Evaluation of Mobile Phone Cover (모바일폰 커버의 휨특성 평가를 위한 사출 성형에 관한 연구)

  • Kim O. R.;Kim M. Y.;Lee S. H.;Kwon C. O.
    • Transactions of Materials Processing
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    • v.15 no.1 s.82
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    • pp.76-81
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    • 2006
  • In this study, warpage characteristics of mobile phone cover through injection molding process were investigated using design of experiments in injection molding process. Warpage in plastic injection molding has a significant effect on quality of product. Effects of injection time, packing pressure, packing time, mold temperature and melt temperature on the warpage of mobile phone cover were considered by numerical analysis and experiment with Taguchi method. The degree of warpage for the injection molded part was measured by using three dimensional coordinate measurement machine. It was shown that temperature control factor has more significant effect on the warpage of mobile phone cover than pressure control factor.

Design Optimization for Minimizing Warpage in Injection Molding Parts with Numerical Noise (수치적 노이즈가 존재하는 사출 성형품 휨의 최적설계)

  • Park, Changhyun;Kim, Sungryong;Choi, Donghun;Pyo, Byunggi
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.11 s.242
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    • pp.1445-1454
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    • 2005
  • In order to minimize warping deformation which is an essential factor in the failure of injection molding parts, this study proposes an optimization design method fer determining design variables of injection molding parts. First, using a commercial package program for injection molding analysis, namely, Computer Aided Plastics Application(CAPA), we investigate the effects of parameters of injection molding process. Next, an optimum design process is established by interfacing CAPA to PQRSM embedded in EMD10S, a design framework developed by the conte. of innovative Design Optimization Technology(iDOT). PQRSM is a very efficient sequential approximate optimization algorithm. Optimum design results demonstrate the effectiveness of the design method suggested in this study by showing that the results of the optimum design is better than those of the initial design. It is believed that the proposed methodology can be applied to other injection molding design applications.

Design Optimization of an Automotive Injection Molded Part for Minimizing Injection Pressure and Preventing Weldlines (사출압력 최소화와 웰드라인 방지를 위한 자동차용 사출성형 부품의 최적설계)

  • Park, Chang-Hyun;Pyo, Byung-Gi;Choi, Dong-Hoon;Koo, Man-Seo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.1
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    • pp.66-72
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    • 2011
  • Injection pressure is an important factor in filling procedure for injection molded parts. In addition, weldlines should be avoided to successfully produce injection molded parts. In this study, we optimally obtained injection molding process parameters that minimize injection pressure. Then, we determined the thickness of the part to avoid weldlines. To solve the optimization problem proposed, we employed MAPS-3D (Mold Analysis and Plastics Solution-3 Dimension), a commercial CAE tool for injection molding analysis, and PIAnO (Process Integration, Automation, and Optimization) as a commercial PIDO (Process Integration and Design Optimization) tool. We integrated MAPS-3D into PIAnO, automated the analysis and design procedure, and performed optimization by employing PQRSM (Progressive Quadratic Response Surface Method) equipped in PIAnO. We successfully obtained optimization results, which demonstrates the effectiveness of our design method.

Evaluation of the grouting in the sandy ground using bio injection material

  • Kim, Daehyeon;Park, Kyungho
    • Geomechanics and Engineering
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    • v.12 no.5
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    • pp.739-752
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    • 2017
  • This study was intended to evaluate the improved strength of the ground by applying the bio grouting method to a loose sandy ground. The injection material was prepared in the form of cement-like powder, with the bio injection material produced by microbial reactions. The grouting test was conducted under the conditions similar to the field where the bio injection material can be applied. In addition, the injection materials (cement and sodium silicate No. 3) used for Labile Waterglass (LW) method and the conventional grouting methodwere prepared through a two-solution one-step process. The injection into the specimens was done at a pressure of 150 kPa and then, with a bender element, their moduliof elasticity were measured on the 7th, 14th, 21st and 28th curingdays to analyze their strengths according to the duration of curing. It was confirmed that in all injection materials the moduli of elasticity increased over time. In particular, when 30% of the bio injection material was added to 100% cement, the modulus of elasticity tended to increase by about 15%. This confirmed that the applicability became higher when the bio injection material was used in place of the conventional sodium silicate.

Groutability enhancement by oscillatory grout injection: Verification by field tests

  • Kim, Byung-Kyu;Lee, In-Mo;Kim, Tae-Hwan;Jung, Jee-Hee
    • Geomechanics and Engineering
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    • v.18 no.1
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    • pp.59-69
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    • 2019
  • Grout injection is mainly used for permeability reduction and/or improvement of the ground by injecting grout material into pores, cracks, and joints in the ground. The oscillatory grout injection method was developed to enhance the grout penetration. In order to verify the level of enhancement of the grout, field grout injection tests, both static and oscillatory tests, were performed at three job sites. The enhancement in the permeability reduction and ground improvement effect was verified by performing a core boring, borehole image processing analysis, phenolphthalein test, scanning electron microscopy analysis, variable heat test, Lugeon test, standard penetration test, and an elastic wave test. The oscillatory grout injection increased the joint filling rate by 80% more and decreased the permeability coefficient by 33-68%, more compared to the static grout injection method. The constrained modulus of the jointed rock mass was increased by 50% more with oscillatory grout injection compared to the static grout injection, indicating that the oscillatory injection was more effective in enhancing the stiffness of the rock mass.

Optimization of Process Parameters of Die Slide Injection by Using Taguchi Method (다구치 법을 통한 다이슬라이드식 사출성형의 공정파라미터 최적화)

  • Jeong, Soo-Jin;Moon, Seong-Joon;Jeoung, Sun-Kyoung;Lee, Pyoung-Chan;Moon, Ju-Ho
    • Korean Chemical Engineering Research
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    • v.50 no.2
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    • pp.264-269
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    • 2012
  • Die slide injection marvelously reduces the cost and time in processing plastic products because they can simplify the conventional process through eliminating additional process. However, this process must resolve some defects like whitening, resin infiltration, blowhole, resin overflow, etc. In this study, the process parameters of the injection molding are optimized by using the finite element method and Taguchi method. The injection molding analysis is simulated by employing the Moldflow insight 2010 code and the 2nd injection is by adopting the Multi-stage injection code. The process parameters are optimized by using the $L_{16}$ orthogonal array and smaller-the-better characteristics of the Taguchi method that was used to produce an airtight container (coolant reservoir tank) from polypropylene (PP) plastic material.rodanwhile, the optimum values are confirmed to be similar in 95% confidence and 5% significance level through analysis of variance (ANOVA). rooreover, new products and old products were compared by mdasuring the dimensional accuracy, resulting in the improvement of dimensional stability more than 5%.

Investigation on the Injection Timing and Double Ignition Method for Heavy-duty LPG SI Lean Burn Engine (액상분사식 대형 LPG 희박연소엔진의 분사시기 및 이점점화에 관한 연구)

  • 김창업;오승묵;강건용
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.3
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    • pp.92-98
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    • 2003
  • An LPG engine for heavy-duty vehicles has been developed using liquid phase LPG injection (hereafter LPLi) system which has regarded as one of the next generation LPG fuel supply systems. In this wort to investigate the lean bum characteristics of heavy-duty LPLi engine, various injection timing (SOI, start of injection) and double ignition method were tested. The results showed that lean misfire limit of LPLi engine could be extended. by 0.2 $\lambda$ value, using the optimal SOI timing in LPLi system. Double ignition method test was carried out by installing the second spark plug and modified ignition circuit to ignite two spark plugs simultaneously. Double ignition resulted in the stable combustion under ultra lean bum condition, below $\lambda=1.7$, and extension of lean misfire limit compare to ordinary case. Therefore, LPLi engine with optimal SOI and double ignition method could be normally operated at around $\lambda=1.9$ and showed higher engine performance.