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급변하는 시장 환경에 대응하기 위한 노력 중의 하나로 제조기업에서는 생산현장의 생산 활동을 추적 관리하기 위해 MES를 도입하고 있으나, 소규모의 기업에서는 비용과 인력 부족으로 도입이 어려운 실정이다. 중소 제조 기업에 MES의 보급 및 확산을 위하여 본 논문에서는 제조 기업의 정보화 수준 및 공정 수준에 따라 필요한 기능들만 조합할 수 있도록 맞춤형 제조실행시스템을 위한 기능 도출 방법을 제시한다.
We developed a continuous nanopattern manufacturing system that realizes a high-frequency vibrational indentation of a simple flat-edge rigid tool onto a horizontal-feeding polymer substrate with computer-based control. We first designed a process principle and its implementation modules, and subsequently constructed a system prototype. By controlling the tool vibration frequency and indenting force as well as the substrate feeding speed and stroke direction, we can create diverse nanopatterns with various periods and shapes including periodtunable nanogratings and multidimensional nanostructures. Such manufactured nanopatterns may be utilized in many potential applications involving precision machinery components, displays and light sources, sensors and actuators, and flexible electronics and photonics, all of which require tunable periods and shapes.
The repair of road pavement and manhole has been resulted long construction times and traffic jams, environmental pollution from construction wastes, and budget waste due to excessive construction costs. In order to resolve such problems, we have developed the new construction method using C-ring, which can fix and raise the manhole securely. This technology is the method by driving in a wedge after inserting C-ring and expanding it in order to raise manhole to the regular height. This has been approved by the test reports of KOLAS(Korea Laboratory Accreditation Scheme), and was confirmed safety, durability and reliabilty in result. In this paper we approved this technology was able to short working times to around 20% and construction costs to around 50% with compare other construction methods. Also, environmental pollution and civil complaints will be prevented because there will be no longer any noises, vibrations, dust, or construction wastes.
This paper describes the development of automatic shape design program for spur gear. It produces automatically third-dimensional surface and solid model used in CAD/CAM system with inputting simple measurements. This program can maximize user's convenience and get surface and solid model quickly as accepting GUI(graphic user interface). Automatic shape design program for spur gear was developed by VisualLISP, a developer program. Besides, a geometrical method and a mathematical algorithm are used in this program. Use frequency of a fine spur gear is on the increase recently and manufacture process of this gear is heat treatment after press processing with molding. In this press processing, the upper punch portion of a fine spur gear shape is drafted by CAM. Therefore, estimated that surface and solid model of spur gear used to CAM are needed in this research. In this research, after 2 mm gear was modeled by auto shape design program, the upper punch portion of a fine spur gear was manufactured as giving third-dimensional model to CAM software and then, displayed the result as applying to press process.
In this study, four kinds of Si3N4-based ceramic cutting tools with different sintering time were fabricated to investigate the relation among mechanical properties, grain size and tool life. They were used to turn gray cast iron at a cutting speed of 330m/min and depth of cut of 0.5mm and 1mm in dry, continuos cutting conditions. Multiple linear regression model was used to determine the relations among the mechanical property, grain size and the density. It was found that the combination of hardness and fracture toughness showed a good relation with tool life. It was also shown that hardness was the most important single element for the tool life.