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The purpose of the present. paper are not to develope machine tools of new concepts and advanced mechanisms but to introduce and apply new methods and concepts in the design procedure by using and changing the previously existing technologies. In this paper 3D modeller was proposed for designing machine tools and the design automation software(DesignMecha 2000) was used. 3D modeller enabled more fast design and the better manufacturability checking than 2D one so that design error was dramatically reduced. As designer may easily understand the real shape of a part and assembly object, it's easy to draw the drawings not only in a conceptual design but also in a detailed design. Also, design automation software enabled designer to consider the real important design parameters by reducing time to spend in estimating and calculating the strength of the model by the computer aided automatic calculation instead of a tedious and complex: calculation by manual method and help him to easily make the decision for selecting the stocks and design the structure of part or unit of machine tools.
In accordance with the trend for high-speed multi-axes, and the increasing technical sophistication of machine tools, thermal deformation has become an important factor in the accuracy of machine tools. It was analyzed that thermal error deformation error accounts for about for 70% of all errors made with machine tools. In this study, the operational characteristics of the thermal error controller were tested including temperature controllability and temperature substantiality. It is expected that this study will contribute to increase accuracy through minimizing thermal error deformation.
During a decade, there are many researches on microfactory which is the miniature, flexible, and efficient manufacturing system for the micro/meso scale machining device. Moreover many micro machine tool has developed in Japan, U.S., Europe, and Korea. Already we developed a 3-axis micro milling machine with 300×200×320 ㎣ machine size for microfactory. In this study, we introduce the design of a high speed spindle system with air bearings for our micro milling machine. Desired operation speed range of the spindle system is 100,000 ~ 150,000 rpm. In. design step, we have consideration for minimum critical speed, compliance, and weight construction of the spindle system. The shaft length, the shaft outer diameter, bearing positions and bearing stiffness were set as the design values. After the final design of spindle model, we carried out dynamic analysis a spindle system for a micro milling machine by using ADROS, which is our own developed S/W for dynamic design analysis of rotor systems. As the result, we designed a spindle system having the critical speed above the operating speed.
Recently, the robustness against daily impact is important according to portablization and downsizing of mobile electronics. Especially, almost parts of cellular phone should undergo drop test when they fall 1.5 m above ground. This test simulates the case when cellular phone slips through user's fingers while he is talking on the phone. This paper studies a drop test of auto focusing (AF) actuator for camera module in cellular phone. This component is composed of voice coil motor (VCM) as an actuator and leaf spring as a guide and suspension. The leaf spring's deformation is essential for the test because its permanent distortion disables the focusing, and then, a high quality photograph cannot be obtained. Up to now the drop test has been carried out after fabricating real AF actuator. We propose a dropt test model which simulates the drop test based on finite element analysis. This model makes us enable investigate the stress acting on the clamping and curved parts of leaf spring. Stress over Von Mises criterion lets the spring deformed permanently, and then AF actuator malfunctioned, It helps us to design and modify AF actuator without manufacturing the real product. And also, it saves the time and cost for the development of new products.
In this paper, new polishing machine was developed to make the more excellent surface after ultra-precision grinding of aspherical glass lens mold. Our design concept adopts two strategy of eccentric motion mechanism and airbag polishing tool. All machine movements including eccentric polishing motion were controlled by PC-NC motion controller. Airbag tool was modified using spindle and can be inflated by air pressure to fit with aspherical surface. Further verification study can be expected to get the more uniform and better surface roughness by polishing machine.
Nowadays, much attention is being paid to topic map - a kind of searching method based on meanings - for a solution which helps people manage and integrate huge amount of technical information and retrieve correct ones fast and effectively. In order to achieve win-win cooperations between the large enterprises and SMEs (Small and Medium Enterprises), engineering collaborative hub was developed and lots of CAE service - injection-mold flow analysis - were conducted. This paper proposed the integrated KMS(Knowledge Management System) of technical information needed when developing injection molds. Based on the results of injection-mold flow analyses and the use-case models of the people who develop injection-molds, the technical knowledge management system was designed and constructed in the engineering collaborative hub. This system consists of the integrated ontology model of technical information utilizing topic map approach and the retrieval system based on meanings in the field of injection mold development