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대형 선박엔진 크랭크샤프트 가공용 복합가공기 기술 개발
안호상(Ho Sang An),조용주(Yong Joo Cho),최영휴(Young Hyu Choi),이득우(Deug Woo Lee) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.2
A multi-tasking machine tool for large scale marine engine crankshafts has been developed together with design technologies for its special devices. Since work pieces, that is, crankshafts to be machined are big and heavy; weight of over 100 tons, length of 10 m long, and diameter of over 3.5 m, several special purpose core devices are necessarily developed such as PTD (Pin Turning Device) for machining eccentric pin parts, face place and steady rest for chucking and resting heavy work pieces. PTD is a unique special purpose device of open-and-close ring typed structure equipped with revolving ring spindle for machining eccentric pins apart from journal. In order to achieve high rigidity of the machine tool, structural design optimization using TMSA (Taguch Method based Sequential Algorithm) has been completed with FEM structural analysis, and a hydrostatic bearing system for the PTD has been developed with theoretical hydrostatic analysis.
불평형 공작물을 갖는 선반 주축계의 등속운전을 위한 토크제어
장성현(Sung-Hyun Jang),심광섭(Kwang-Seop Sim),이상화(Sang-Hwa Lee),안호상(Ho-Sang An),최영휴(Young-Hyu Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Gravitational unbalance torque of machine tool's spindle system is usually caused by heavy workpiece with unbalance weight. In this paper, a lathe spindle system with unbalanced workpiece is mathematically modeled a 2-D.O.F. lumped parameter model and resultant unbalance torque corresponding to velocity response is calculated by using MATLAB. A direct motor control is used to compensating the unbalance torque arisen from unbalanced workpiece. Consequentially, the torsional vibration caused by the unbalance torque is reduced.
장성현(Sung Hyun Jang),최영휴(Young Hyu Choi),김수태(Soo Tae Kim),안호상(Ho Sang An),최학봉(Hag Bong Choi),홍종승(Jong Seung Hong) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.2
In this study, three types of large scale multi-tasking machine tools together with core technologies involved have been developed and introduced; a multi-tasking machine tool for large scale marine engine crankshafts, a multi-tasking vertical lathe for windmill parts, and a large scale 5-axis machine tool of gantry type. Several special purpose devices has been necessarily developed for the purpose of handling and machining big and heavy workpieces accurately, such as PTD (Pin Turning Device) with revolving ring spindle for machining eccentric crankshaft pins, hydrostatic rotary table and steady rest for supporting and resting heavy workpieces, and 2-axis automatic swiveling head for high-quality free surface machining. Core technologies have been also developed and adopted on their detail design stage; 1) structural design optimization with FEM structural analysis, 2) theoretical hydrostatic analysis for the PTD and rotary table bearings, 3) box-in-box type cross-rail and octagonal ram design to secure machine rigidity and accuracy, 4) constant spindle rpm control against gravitational torque due to unbalanced workpiece.
최영휴(Young-hyu Choi),안호상(Ho-sang An),최학봉(Hag-bong Choi),홍종승(Jong-seung Hong) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Recently, the demands of the large scale machine tools gradually increase to machine the large parts, such as large scale crankshaft, yaw and pitch bearings for the wind power generator and the vehicle or aircraft components. But the high technology is necessary in order to develop the huge machine tools. Furthermore, the global market of it has been monopolized by a few company. So, we need to develop the large scale machine tools and study it's core technology to rush into the increasing market. In this study, we carried out the researches for the important core technology of a multi-tasking machine tool; a multi-tasking machine tool for large scale marine engine crankshaft, multi-tasking vertical lathe for windmill parts, and large scale 5-axis machine tool of gantry type for multi-task machining.
심광섭(Kwang-Seop Sim),장성현(Sung-Hyun Jang),황인욱(In-Wook Hwang),안호상(Ho-Sang An),최영휴(Young-Hyu Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
This paper describes the dynamic characteristic analysis of a high-torque spindle system for a heavy duty lathe. In the study, we performanced the analysis of a high-torque spindle system for our heavy duty lathe by using ADROS, which is our own developed S/W for dynamic analysis of spindle system. We get a results some analysis dynamic characteristics of a spindle, such as natural frequency, whirl frequency and critical speed.
랜덤가진시험을 이용한 대형 크랭크샤프트 가공용 복합다기능 선반의 강성 평가
최영휴(Young Hyu Choi),하경보(Gyung Bo Ha),안호상(Ho Sang An) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.7
Machine tool vibration is well known for reducing machining accuracy. Because vibration response of a linear structure generally depends on its transfer function if the magnitude of excitation were kept constant, this study introduces a RET(Random Excitation Test) based on FRF method to evaluate stiffness of a prototype HDMTL(Heavy-Duty Multi-Tasking Lathe) for large crankshaft of marine engine. Firstly, two force loops of the lathe and corresponding structural loops were identified:1) workpiece - spindle - head stock - main bed, 2) workpiece - tool post - carriage bed. Secondly, compliances of each structural loop were measured respectively using RET with a hydraulic exciter and then converted into stiffness. Finally, the measured stiffness was compared with that obtained previously by FEM analysis. As the result, both measured and computed stiffness were closely in agreement with each other. And the prototype HDMTL has evidently sufficient rigidity above ordinary heavy-duty lathes.
최영휴(Young-Hyu Choi),김수태(Soo-Tae Kim),안호상(Ho-Sang An),최학봉(Hag-Bong Choi),홍종승(Jong-Seung Hong) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
This paper introduces manufacturing technologies for each of the 3 different kind of large scale multi-tasking machine tools; for special examples, a multi-tasking machine tool for large scale marine engine crankshaft, a multi-tasking vertical lathe for windmill parts, and a large scale 5-axis machine tool of gantry type for multi-task machining to machine highly precision large parts.