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신경망 및 유전 알고리즘을 이용한 최적 사출 성형조건 탐색기법
백재용(Jae Yong Baek),김보현(Bo Hyun Kim),이규봉(Gyu Bong Lee) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
It is very a time-consuming and error-prone process to obtain the optimal injection condition, which can produce good injection molding products in some operational variation of facilities, from a seed injection condition. This study proposes a new approach to search the optimal injection molding condition using a neural network and a genetic algorithm. To estimate the defect type of unknown injection conditions, this study forces the neural network into learning iteratively from the injection molding conditions collected. Major two parameters of the injection molding condition - injection pressure and velocity are encoded in a binary value to apply to the genetic algorithm. The optimal injection condition is obtained through the selection, cross-over, and mutation process of the genetic algorithm. Finally, this study compares the optimal injection condition searched using the proposed approach with the other ones obtained by heuristic algorithms and design of experiment technique. The comparison result shows the usability of the approach proposed.
사출조건 변화에 따른 기계적 성질의 영향에 대한 금형설계 및 제작에 관한 연구
민세홍,임기창 경원전문대학 1999 論文集 Vol.21 No.-
Injection molding technique is directly related to high quality, low cost which customer needs. Injection molding process is very importantly dealt with the sharp increase of resin consumption and so is studied very actively nowadays. The influential factors to injection molding parts are material melting temperature, mold temperature, injection speed, injection pressure melting temperature are especially important. The boundary and contents of research and development are design injection molding making test specimen of KS rules, manufacturing injection mold, injection varied on mold temperature, injection pressure and melting temperature, mechanical properties injection test specimen, and analysis of test. In this study the specimen for tensile and impact strength tests were made under various cylinder and mold temperatures. Measurements were done to find optimum region of mechanical strength through the tests. And me found that mechanical strength decrease by increasing mold temperature and decreasing melting temperature. Therefore if the molding process is done under the optimum injection characteristics of resin for the final parts can by optimized as well as formability.
전언찬(Eon-Chan Jeon),박정우(Jung-Woo Park),김수용(Soo-Yong Kim),이철장(Chul-Jang Lee),안광우(Kwang-Woo Ahn) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.3
In this paper, we design internal space in plunger-type low pressure vacuum injection molding machine from numerical study. And we study characteristic of viscoelastic flow for searching injection molding condition. Then the flow analysis was performed using the CAE S/W. The result shows optimal value of nozzle and hole in injection chamber. And we investigated qualitatively relationship between injection pressure and injection mass flow with variable shear rate
Man-Jun Yu(유만준),Jong-Cheon Park(박종천) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.12
In this study, the optimal feed system and process conditions that can simultaneously minimize each warpage occurring in the two shape features of the 2P Header HSG, a connector part for automobiles, were determined through injection molding simulation analysis. First, we defined each warping deformation of the two features geometrically and quantified them approximately using the injection molding simulation data. For design optimization, a full factorial experiment was conducted considering the feed system, resin temperature, and packing pressure as design variables, and a follow-up experiment was conducted based on the analysis of the average warpage. In this study, an optimal design was generated considering both the warpage result and resin-saving effect. In the optimal design, the warpages of the two shape features were predicted to be 0.18 and 0.29 mm, and these warpages were found to meet the allowable limit of warpage, which is 0.3 mm, for part assembly.
Jong-Cheon Park(박종천),Man-Jun Yu(유만준),Ki-Yoon Park(박기윤) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.11
In this study, we design the feed system and process conditions for a lamp garnish lens of an automobile. For this purpose, four design alternatives are presented and injection molding simulation analyses are performed. The optimal feed system is selected by considering the formability of the product and the cost of mold manufacture. The product formability is assessed by the weld line, warpage, sink mark and the maximum injection pressure, whereas the mold-making cost is estimated by the number of valve gates in the hot runner system. To improve the product formability, process conditions are optimized using an experimental design approach named one-factor-at-a-time. No weld line is generated as a result of the optimization. In addition, it is found the warpage and sink mark are reduced while the maximum injection pressure is increased, compared with those before the optimization.
Man-Jun Yu(유만준),Jong-Cheon Park(박종천) 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.7
The objective of this study is to minimize warpage at the opening of an injection-molded component for automobile door locking mechanism by optimizing the cooling channel design and molding conditions. Experiments were initially conducted using Taguchis orthogonal array and the face-centered central composite design method, followed by statistical analysis to determine the optimal design conditions for the peripheral cooling channels and molding conditions. A simulation experiment was conducted to validate the predicted optimal design conditions, which yielded a warpage of 0.8319 mm. To further reduce the warpage, serial- and baffle-type cooling channels were installed between the head and opening of the product. A full factorial experiment was conducted to optimize the design variables for each channel type. The internal cooling channels significantly reduced the fluctuation of the mold surface temperature to maintain the allowable warpage limit of 0.7 mm. Comparisons of the warpage values confirmed that baffle-type internal cooling channels provided more uniform cooling and effectively reduced warpage compared with serial-type channels.
섬유강화 플라스틱 복합재료의 사출성형에 있어서 기계적 물성치에 미치는 성형조건의 영향
윤성운 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1
Injection molding is the most widely used process for the industrial forming of plastic articles. In this paper, the effects of fiber length, fiber content and molding conditions on the mechanical material properties, which have strength, strain, modulus are studied experimentally.
황지은(Ji-Eun Hwang),이동욱(Dong-Wook Lee),김종순(Jong-Soon Kim),강태호(Tae-Ho Kang),김인관(In-Kwan Kim),김영수(Young-Soo Kim) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
Injection molding is used for the purpose of low-cost and mass production. The filling, holding, cooling and ejecting processes of injection molding are put together. The purpose of this research is to predict injection molding processes and to suggest there by that optimum injection molding conditions. We performed the CAE(Computer Aided Engineering) of injection molding to optimize the injection molding processes. A prediction through CAE, such as fill pattern, pressure, weldlines, temperature at flow front are applied and compared to real experiment.