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- 저자 : Hwang-Jin Son(손황진) (검색결과 6 건)
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손황진(Hwang-Jin Son),양순철(Soon-Chul Yang),김태규(Tae-Gyu Kim),김수태(Soo-Tae Kim),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Drilling is important machining process occupied over 30% in manufacturing industry. But, drilling process have many problems, such as decreasing of machining accuracy, quality of surface roughness and roundness, etc. Therefore many studies are carried out to solve these problems. In this study, three multi facet drills(MFD) which are improved chisel point shape of standard drill(STD) are developed. Performance of multi facet drills(MFD) which is developed in this study is discussed viewpoint of surface roughness, drilling force, roundness of machined hole and chip shapes. From obtained results, it is confirmed that performance of rough flute drill(RFLD) type is most excellent among used multi facet drills.
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손황진(Hwang-Jin Son),양순철(Soon-Chul Yang),황종대(Jong-Dae Hwang),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.2
Drilling operation is such an important machining process, which has been wildly applied to the industry, occupied over 30% of whole industry. However, there are many aspects of drilling process should be improved, such as increases of thrust force, surface roughness, and roundness, ect. In this study, we are aiming to reduce the thrust force, surface roughness, and roundness in drilling process. For this purpose, multi facet drills (MFD) of three types that are modified from standard drill (STD) are developed. The first type is multi stair drill (MSD) with shape of stair on relief plane. The second type is rough facet drill (RFD) with shape of round on relief plane. The third type is rough flute drill (RFLD) with shape of round on flute plane. For three types of MFD, we were carried out performance evaluation from the perspective of thrust force, surface roughness and roundness of machined hole. From obtained result, we could confirmed that performance of rough flute drill (RFLD) type is most excellent.
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공구자세의 연속제어를 통한 선박용 프로펠러의 5축 가공 표면조도의 개선
손황진(Hwang-Jin Son),임은성(Eun-Seong Lim),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
A marine propeller is designed for preventing cavitation priority. Cavitation is a phenomenon which is defined as the vibration or noise by dropping the pressure on the high-speed rotation of the propeller. There has to be a enough thrust on the low-speed rotation for preventing cavitation. Thus, it has to be considered in the increasing of the number of blade and the angle of wing to design the propeller. In addition, flow resistance will be increasing by narrowing the width between blades. So high quality surface roughness of the hub to minimize flow resistance is required. Interference problems with tool and neighboring surfaces often take place from this kind of characteristics of the propeller. During 5-Axis machining of these propellers, the excessive local interference avoidance, necessary to avoid interference, leads to inconsistency of cutter posture, low quality of machined surface. Therefore, in order to increase the surface quality, it is necessary to minimize the cutter posture changes and create a continuous tool path while avoiding interference. This study, by using a MC-space algorithm for interference avoidance and a MB-spline algorithm for continuous control, is intended to create a 5-Axis machining tool path with excellent surface quality. Also, an effectiveness is confirmed through a verification manufacturing.
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The Development of Module for 5-axis Drilling of a Closed Type Impeller
Hwang-Jin Son(손황진),Yoon-Tea cho(조영태),Yoon-Gyo Jung(정윤교) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.1
An impeller is difficult to machine due to the complex, overlapping and twisted shapes that form the blades of an impeller. Therefore, most CAM software companies have developed a CAM module for manufacturing an impeller in addition to their CAM software. However, it is not easy for inexperienced users to machine impellers. The purpose of this paper is to outline the development of an automatic CAM module for the manufacturing of an impeller (E-ICAM) which is based on visual basic language and which uses a CATIA graphical environment in order to simplify the machining of impellers. The automatic CAM module generates a tool path and proposes the recommended cutting condition according to the stock and tool material. In addition, it includes a post-processor for five-axis control machining. Therefore, a user can easily machine impellers using this automation module. There are two types of impellers: the closed and open types. The closed-type impeller consists of the body and cover parts. To combine these two parts, it is necessary to create tap holes on the shroud of the body. Therefore, in the study, a drilling CAM program for a closed-type impeller is developed and manufactured by creating NC data from the developed drilling program. After manufacturing the test specimen, its compatibility was verified.
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Study on the Accuracy Improvement of E-ICAM in Consideration of Gouging
Hwang Jin Son(손황진),Young Tae Cho(조영태),Yoon Gyo Jung(정윤교) Korean Society for Precision Engineering 2015 한국정밀공학회지 Vol.32 No.8
Five-Axis machines can generate undesirable defects such as the undercutting and overcutting errors that frequently occur in the three-axis machining process. It is therefore necessary to develop a program for NC-code generation, whereby the cutter posture is considered to decrease the occurrence of defects. In previous studies, the Easy-Impeller CAM(E-ICAM), an automatic CAM program used for the five-axis machining of impellers, was developed; however, when EICAM is used to machine an impeller, it is possible to gouge the hub and blade. Therefore, the aim of this study is the establishment of a formula for each type of endmill to minimize gouging according to the cutter posture, in consideration of several factors that affect accuracy in the machining of an impeller. This study also aimed to improve the performance and accuracy of EICAM in the manufacturing of impellers.
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절삭력 제어 프로그램을 이용한 Inconel718 소재의 생산성 향상에 관한 연구
이승헌(Seung-Heon Lee),손황진(Hwang-Jin Son),조영태(Young-Tae Cho),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.6
Productivity improvement and cost reduction in the aircraft industry have become major industrial objectives, and improving productivity by reducing machining time has become a key focus. When numerical cutting code is created by CAM software, such as CATIA or UG-NX, it is impossible to control machining feed speed using cutting force changes depending on the machining tool path. However, machining an aircraft engine part from difficult material, such as Inconel 718, takes a long time, and tool chipping or breakage often occurs from forcing the machining path too quickly. This study investigated and verified the reliability of the AdvantEdge production module (PM)using cutting power tests. In particular, diffuser and diffuser case parts were considered, comparing cutting power and machining time using AdvantEdge PM and CATIA.
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