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RISS 인기검색어
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- 저자 : 황철웅(Chul-Woong Hwang) (검색결과 3 건)
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미세입자 분사가공용 시퀸스 제어가 가능한 2축 스테이지 개발에 관한 연구
황철웅(Chul-Woong Hwang),이세한(Sea-Han Lee),왕덕현(Duck Hyun Wang) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.8
A stable rotational-to-linear motion transformation structure using a driving mechanism with 2 degrees of freedom was developed for an orthogonal mechanism to prevent the interference of each axis in 2D motion. In this mechanism, a step motor was used for precise position control. This structure was developed to maneuver workparts in micro particle blast machining experiments. To determine the real-time performance of micro particle blast machining, the control, input, and output were operated simultaneously and precise position control was implemented, using a timer interrupt with multiple execution codes. The two step motors obtained precise position control by removing backlash with a ball-screw mechanism. The device has menu-type control codes for user-friendliness, and real-time sequence control was simultaneously adopted for user control input.
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Cutting Conditions of Carbide Insert Drill
Sung-Yun Choi(최성윤),Chul-Woong Hwang(황철웅),Sang-Tae Lee(이상태) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.6
Drilling is a crucial process that takes up a significant amount of weight during machining operations. In addition, drill tip-type tools and related operations have been developed for manufacturing industries to achieve economic efficiency. In this study, SM45C carbon steel, widely used for machine structures, was utilized as the working material after quenching and tempering. Insert-tip types of carbide tools, such as TiN and TiAlN, were used as tool materials. Drilling conditions such as the spindle revolution, feed rate, step of cut, and tool diameter were used to measure roughness, roundness, and straightness using the orthogonal array table statistical method. The surface roughness, roundness, and straightness characteristics based on the conditions were analyzed using ANOVA. The results showed that the spindle speed and feed rate were the main factors influencing carbide insert-tip drilling under the same conditions as the experimental conditions.
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Hyoung-Tae Lee(이형태),Chul-Woong Hwang(황철웅),Sea-Han Lee(이세한),Duck Hyun Wang(왕덕현) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.10
In fine-particle–injection processing, hard fine particles, such as silicon carbide or aluminum oxide, are injected using high-pressure air, and a small amount of material is removed by applying an impact to the workpiece by spraying at high speeds. In this study, a two-axis stage device capable of sequence control was developed to spray various shapes, such as circles and squares, on the surface during the micro-particle jetting process to understand the surface-shape micro-particle-processing characteristics. In the experimental device, two stepper motors were used for the linear movement of the two–degree-of-freedom mechanism. The signal output from the microcontroller is converted into a signal with a current sufficient to drive the stepper motor. The stepper motor rotates precisely in synchronization with the pulse-signal input from the outside, eliminating the need for a separate rotation-angle sensor. The major factors of the processing conditions are fine particles (silicon carbide, aluminum oxide), injection pressure, nozzle diameter, feed rate, and number of injection cycles. They were identified using the ANOVA technique on the design of the experimental method. Based on this, the surface roughness of the spraying surface, surface depth of the spraying surface, and radius of the corner of the spraying surface were measured, and depending on the characteristics, the required spraying conditions were studied.
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