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안광우(Kwang-Woo Ahn),김동후(Dong-Hoo Kim),김태호(Tae-Ho Kim),전언찬(Eon-Chan Jeon) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.5
A technique based on the finite element method (FEM) is used in the simulation of metal cutting process. This offers the advantages of the prediction of the cutting force, the stresses, the temperature, the tool wear, and optimization of the cutting condition, the tool shape and the residual stress of the surface. However, the accuracy and reliability of prediction depend on the flow stress of the workpiece. There are various models which describe the relationship between the flow stress and the strain. The Johnson-Cook model is a well-known material model capable of doing this. Low-alloy steel is developed for a dry storage container for used nuclear fuel. Related to this, a process analysis of the plastic machining capability is necessary. For a plastic processing analysis of machining or forging, there are five parameters that must be input into the Johnson-Cook model in this paper. These are (1) the determination of the strain-hardening modulus and the strain hardening exponent through a room-temperature tensile test, (2) the determination of the thermal softening exponent through a high-temperature tensile test, (3) the determination of the cutting forces through an orthogonal cutting test at various cutting speeds, (4) the determination of the strain-rate hardening modulus comparing the orthogonal cutting test results with FEM results. (5) Finally, to validate the Johnson-Cook material parameters, a comparison of the room-temperature tensile test result with a quasi-static simulation using LS-Dyna is necessary.
안광우(Kwang-Woo Ahn),전언찬(Eon-Chan Jeon),김태호(Tae-Ho Kim) 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.5
Increased productivity and cost reduction have emerged as the main goals of the industry due to the development of the machinery industry, and mechanical materials with excellent properties with the development of the machine tool industry are widely used in machine parts or structures. In addition, the cutting process of production plays a pivotal role in the production technology. Studies on cutting have involved a lot of research on the material, the cutting tool, the processing conditions, and numerical analysis. Due to the development of the computer through numerical analysis, cutting conditions, the assessment of cutting performance, and cutting quality could be predicted. This research uses the creation of the material model and AdvantEdge Production module for the NC code analysis. To improve the productivity, this research employs the optimization method to reduce cutting time.
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
금형가공시 절삭력 변화에 따른 생산성 비교에 관한 연구
이수용(Su Yong Lee),박병훈(Byung Hoon Park),김수용(Soo Yong Kim),안광우(Kwang Woo Ahn),박정보(Jeong Bo Park),전언찬(Eon Chan Jeon) (사)한국CDE학회 2011 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2011 No.1
The mold is widely used for mass production in present industry. Also, product cycle time is faster, for this request, high productivity improvement in mole machining is required. And, In case of mold manufacture company, the delivery shortening is required to quickly manufacture new product. Therefore, we aim for the delivery shortening though the method of machining time shortening in mold machining. On this paper, first, we make the NC-code of Insert die-casting as the object model using PowerMill. And then, analyze cutting force by Toolpath in Insert mold machining using Production Module of Advantedge company which is cutting force analysis program. After that, we come up with the optimum conditions of productivity improvement throughout the analysis result of before and after optimization of Chip Load value and cutting force, machining time variation by changing min tangential force to 80, 85, 90% of max tangential force.
김수용(Soo-Yong Kim),김승현(Seung-Hyun Kim),안광우(Kwang-Woo Ahn),장성규(Seong-Gyu Jang),변상민(Sang-Min Byon),전언찬(Eon-Chan Jeon) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
This study is about a prototype test using a low-pressure vacuum injection molding machine which has developed in order to make up for weak points of previous models. Also, this prototype, which is estimated by analyzing injection molding, is designed to the test of the low-pressure vacuum injection molding machine. It is compared with the result of the injection molding analysis in accordance with the reverse engineering. Finally, we ensure that it is possible to analyze products from the low-pressure vacuum injection molding machine.
보론 강의 스폿 용접 시 발생하는 스패터 감소에 관한 연구
지성환(Sung Hwan Jee),김진아(Jin A Kim),안광우(Kwang Woo Ahn),전정도(Jung Do Jeon),전언찬(Eon Chan Jeon) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
When assemble automotive steel that produced by stamping, it is widely used the resistance spot welding which is relatively easy to work with and has an outstanding bond force. Spot welding results in different features in welding zone depending on current, weld time and change of welding force, and therefore determine weld quality. If the spatter which generated in spot welding adheres to the surface of steel, it can have a bad influence on the quality of automotive exterior and needs additional work for removal. It can cause the rising of prime costs, irregular workload and the exterior with bad images. Thus, this study will examine the optimal welding condition in order to decrease the spatter through comparison of changes in the spatter according to welding current, welding force and welding time while resistance spot welding.
한민식(Min-Sik Han),송호봉(Ho-Bong Song),박병훈(Byung-Hoon Park),안광우(Kwang-Woo Ahn),전언찬(Eon-Chan Jeon) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
When the deep hole drilling with BTA drill, there are serious problems such as accuracy of diameter, surface roughness to inhibit the required qualities. With the purpose of the accuracy improvement in deep hole drilling, we investigated the influence of the drilled hole accuracy and the cutting resistance of materials that occurred as the variation of the cutting condition after deep hole drilling with BTA drill on fuel pipe for large ship.
PDA Rear Cover의 사출 조건선정에 관한 연구
김승현(Sung-Hyun Kim),김나리(Na-Ri Kim),안광우(Kwang-Woo Ahn),변상민(Sang-Min Byon),전언찬(Eon-Chan Jeon) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
In injection molding, location of gates have great influence on the quality of plastic parts. The study is about how shape accuracy can be influenced by Many factors such as, section shape, resin and mold temperature, filling time, etc which affect the quality of injection part during injection molding process. We performed Forming Analysis by differing the location of gate and kinds of runner and we are going to bring out the best forming condition based on the examined result. This paper presents the application of neural network in suggesting the optimized molding conditions for improving the quality of molded parts based on data of FE Analysis carried out through CAE software, Moldflow.
한민식(Min-Sik Han),송호봉(Ho-Bong Song),박병훈(Byung-Hoon Park),안광우(Kwang-Woo Ahn),전언찬(Eon-Chan Jeon) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
When the deep hole drilling with BTA drill, there are serious problems such as accuracy of diameter, surface roughness to inhibit the required qualities. With the purpose of the accuracy improvement in deep hole drilling, we investigated the influence of the drilled hole accuracy and the cutting resistance of materials that occurred as the variation of the cutting condition after deep hole drilling with BTA drill on fuel pipe for large ship.