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고태조,김종한,윤인준 한국정밀공학회 2009 International Journal of Precision Engineering and Vol. No.
The powder injection molding (PIM) technique is a manufacturing process that combines the versatility of plastic injection molding with the strength and integrity of machined, pressed, or otherwise manufactured small, complex, metal parts. When metal products are manufactured using injection molding, the process is both cost effective and time efficient. Nowadays, small metal products are manufactured using powder injection molding. Conventionally, cutting tools, such as endmills, are manufactured using a grinding process, because cutting tool materials are hard and have a high mechanical strength as well as a complex shape. To reduce the grinding time for the flute of an endmill, we suggested using an endmill blank method, where the flute is fabricated using PIM before edge grinding. This paper also describes how to finish the remainder of the cutting processes and discusses the performance of the formed cutting tool compared with a conventional tungsten carbide tool.
자기구성 신경회로망을 이용한 면삭밀링에서의 공구파단검출
고태조,조동우 대한기계학회 1994 대한기계학회논문집 Vol.18 No.8
This study introduces a new tool breakage detecting technology comprised of an unsupervised neural network combined with adaptive time series autoregressive(AR) model where parameters are estimated recursively at each sampling instant using a parameter adaptation algorithm based on an RLS(Recursive Least Square). Experiment indicates that AR parameters are good features for tool breakage, therefore it can be detected by tracking the evolution of the AR parameters during milling process. an ART 2(Adaptive Resonance Theory 2) neural network is used for clustering of tool states using these parameters and the network is capable of self organizing without supervised learning. This system operates successfully under the wide range of cutting conditions without a priori knowledge of the process, with fast monitoring time.
고태조,정병묵,양현모,박종권 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
High precision machining technology has become one of the important parts in the development of a precision machine. Such a machine requires high speed on a large workspace as well as high precision positioning. For machining systems having a long stroke with ultra precision, a micro stage system with lever mechanism is proposed in this paper. The proposed micro stages are activated by the piezo-actuators with high precision, however, they have severe disadvantage for the travel range that the stroke is limited to a few microns. Because it is not easy to increase the stroke of piezo-actuator, it is very difficult to make an X-Y stage with only piezo-actuators. Therefore, in order to increase it, this paper proposes a lever mechanism for the piezo-actuator stage. In the experiments, we can confirm that the stroke is increased more than three times and it is possible to implement the micro X-Y stage using piezo-actuators.
Mill-Grinding with Electroplated Diamond Abrasives for Ceramic Cutting
고태조,윤인준 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Ceramic materials are very hard and brittle and are not easily cut with typical methods, such as grinding or cutting. These materials are cut mostly using the grinding process, but the material removal rate or process efficiency is not satisfactory. For this reason, a hybrid electroplated diamond abrasive tool was proposed for cutting and grinding. The tool looks like a typical endmill or electroplated grinding wheel, but it has a cutting edge and flutes without a radial land and clearance. After electroplating the cutting tools with diamond abrasives, cutting experiments were carried out. The results showed that a ductile cutting regime was possible with the diamond abrasives. In addition, the cutting speed could be increased as in typical cutting. The tool life, defined as the rate of detachment of the abrasive, was also satisfactory. Consequently, this type of cutting tool is useful for cutting hard materials such as ceramics or glass that are used in advanced industrial products.
고태조,김희술 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.4
The thermal deformation of a machine tool spindle influence the performance of the manufacturing systems for precision products. In this research, thermal analysis of a high speed machine tool spindle with the rolling bearing and the built-in motor is carried out by using Finite Difference Method. The thermal boundary conditions describing the heat generation in the bearing and built-in motor are considered in the simulation. And various convective boundary conditions are assumed with the empirical formula in the references. From the simulation results, the characteristics of each element affecting the dynamic thermal behaviour of the machine tool spindle systems have been clarified. Therefore, this model can be well applied to the future development of the high speed spindle systems.
고태조,조동우 대한기계학회 1995 대한기계학회논문집 Vol.19 No.3
In intelligent machine tools, a computer based control system, which can adapt the machining parameters in an optimal fashion based on sensor measurements of the machining process, should be incorporated. In this paper, the technology for adaptively optimizing the cutting conditions to maximize the material removal rate in face milling operations is proposed using the exterior penalty function method combined with multilayered neural networks. Two neural networks are introduced ; one for estimating tool were length, the other for mapping input and output relations from experimental data. Then, the optimization of cutting conditions is adaptively implemented using tool were information and predicted process output. The results are demonstrated with respect to each level of machining such as rough, fine and finish cutting.