http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유한요소법을 이용한 절삭가공면의 소성스트레인에 관한 연구
신형곤,김태영,Shin, Hyung-Gon,Kim, Tae-Young 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.3
Plastically deformed layer influences the mechanical property of the mechanical element such as creep hardening, microscopical crack and stress corrosion destruction. Therefore, the property so called the surface integrity has to be considered, and the machined surface including plastic deformation, distribution of stress has to be conducted quantitatively. This paper explains the orthogonal cutting, and made an orthogonal cutting model using the finite element method, then analyzed cutting power, plastic deformation of workpiece. It introduces the developed subsequent recrystallizations technique for measurement of the plastic strain of machined surface, and verified the technique.
생체재료인 마그네슘 합금의 미소판재 가공시 표면거칠기에 대한 분석
신형곤,유승현,김휘종 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.4
생체용 마그네슘 합금은 전연성 부족과 열에 의한 팽창률 변화가 심하여 2mm 이하의 판재를 만드는 것이 매우 어려움 문제이다. 이를 해결하기 위해 압연 방식, 세이퍼 방식, 밀링 방식 등의 다양한 방법이 존재할 수 있다. 압연 방식을 적용하여 실험을 진행하였으나 Mg 합금은 전연성, 취성의 문제로 인해 파괴되는 현상이 발생하였다. 그리고 세이퍼 방식은 가공시 충격이 발생하는 단속절삭이기 때문에 표면에 자국이 남게 되고 시험편이 휘어지는 현상이 발생하는 문제가 발생하였다. 최종적으로 밀링 방식으로 전환하여 가공실험을 수행해 본 결과 매우 만족할 만한 결과값을 얻게 되었고, 이 결과는 절삭조건을 절삭회전수 1000rpm, 이송속도 127mm/rev, 절삭깊이 0.5mm로 엔드밀 사용하여 가공하였을 때 Ra = 0.44㎛의 표면거칠기값을 얻게 되었다. 본 논문에서는 생체 마그네슘 합금재료로 미소판재를 가공하였을 때 매우 좋은 표면을 유지하며 2mm 이하의 미소 두께를 지속적으로 가공이 가능하도록 하였으며, 다양한 절삭조건, 2날과 4날 엔드밀 날수 변화 등을 통해 최적의 가공조건을 알아보는 실험을 진행하였다.
드릴 가공시 열연강판의 절삭저항 및 AE 신호 특성에 관한 연구
신형곤,문상돈,김태영 전북대학교 공업기술연구소 1998 工學硏究 Vol.30 No.-
Drilling testes were carried out to clarify the factors influencing the drilling characteristics of hot-rolled high strength steel. This research was studied about the relationship between thrust and cutting resistance and the comparison of tool wear by AE and cutting force signal during drilling. The obtained results are as follows a) The cutting resistance of specimens may be influenced by the feedrate much more than the cutting speed, and the cutting resistance increase with the increase of feedrate. Also, AE signal on drilling was influenced by the cutting speed but was not influenced by feedrated. b) The specimens hardness also influences the thrust forces and torque occurring in a drilling operation. Key Words : hot-rolled high strength steel(열연강판), tool wear(공구마멸)
신형곤 한국기계기술학회 2011 한국기계기술학회지 Vol.13 No.4
In commercial vehicle, sub-frame which equipped in main frame supporting dump deck and oil tanker. This is the main structure for all equipment which including joint function. Sub-frame is made by welding process, this susceptible to deform and crack by its longitudinal size. Also various kind of sub-frame make it difficult to standardization in manufacturing process and exclusive jig is not adapted yet. Frame size is over 6~8m and weight is more than 300kg this make re-work more difficult. If manufacturing company made precise sub-frame, this is not only convenient for customers but also save the company money by reducing the working time. In this study manufacture the sub-frame be suitable for its main function and develop exclusive welding jig for obtain checking fixture function as well.
신형곤,강기원,김영철,문정수,황성국 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.6
Currently, due to the development of technology, the industry is proceeding with the development of advanced materials with high performance such as light weight, heat resistance and electric conductivity. Carbon Fiber Reinforced Plastics (CFRP) is an excellent material with high heat resistance, high strength and thermal shock resistance. In order to obtain excellent hole shape in CFRP drilling, we compared the modified drill shape and the conventional carbide drill. On the other hand, we determine the proper helix angle by observing the CFRP surface according to the helix angle at the trimming of the end mill proceeding after the hole machining.