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백응률,심종필,이재근 嶺南大學校 工業技術硏究所 2002 工業技術硏究所論文集 Vol.30 No.1
A common problem in Metal Injection Molding (MIM)is that the final component dimensions do not comply with those specified for the component. therfore, several factors influence the tolerance capabilities of the MIM process, including, metal powder characterization, feedstock constituents, feedstock mixing, mold design, injection molding, debinding and sintering. The purpose of this study is to investigate dimensional control of atypical and thin parts in MIM with those factors taken into account. An improved wax-based multi-component was developed for MIM of tungsten cemented carbide. A critical solid loading of 58vol% and ideal rheological properties were obtained by the feedstock based on the binder. the 2.5-dimensional PIM filling program(PIM/flow)was able to predict injection molding to produce injection molded atypical and thin parts. Injection molding parameters including mold parameters and injection parameters were optimized by analyzing injection defeats. Solvent debinding followed by subsequent thermal debinding could substantially increase the debinding rate. Finally, Good shape retention ane dimensional accuracy were able to controlled within 0.5%.
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백응률,심종필,김판권 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1
The aim of the investigation was to study the effect of hot working on the tensile properties of the Stellite 6 alloy, normally used in the form of castings. To determine most suitable hot working temperature, firstly specimens were preheated so as to obtain maximum deformation without cracking, upsetting tests were preformed at temperatures ranging from 1150 to 1300℃ at intervals of 50℃. As the result, the deformation of 35% without cracking is possible at 1250℃. Both cast and hot worked specimens were investigated microstructure, composition of carbides, constituting phase and hardness of specimens by using SEM and tensile test was carried out in order to know tensile properties of specimens. As the result of observing Microstructure, hot workings breakdowns eutectic carbide network in the Stellite 6 alloy, and eutectic carbides are aligned in rolling direction. The result of the tensile test, hot worked specimen is much higher than the casting specimen in the tensile properties.
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