• Title/Summary/Keyword: 피드스탁

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Fabrication Studies for PZT Preform Using PIM (PIM을 이용한 PZT 프리폼의 제조에 대한 연구)

  • Shin, Ho-Yong;Kim, Jong-Ho;Jang, Jong-Soo;Im, Jong-In
    • The Journal of the Acoustical Society of Korea
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    • v.28 no.8
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    • pp.796-805
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    • 2009
  • In this paper, a fabrication process for PZT preform of 1-3 type piezo-composite were studied using powder injection molding (PIM). The viscosity and the Pressure-Volume-Temperature (PVT) characteristics of the fabricated PZT feedstock were analyzed. The filling patterns, pressure, temperature distributions, and forming defects of the preform were analyzed with 3D TIMON commercial packages during PIM process. Also the fabrication conditions and the delivery system of the preform were optimized during the entire PIM process. Based on the simulated results, the preform having uniform distributions of the PZT rod was fabricated with the PIM process.

Metal Injection Molding Analysis for Developing Embroidering Machine Rotary Hooks (자수기용 로터리 훅 개발을 위한 금속분말 사출성형해석)

  • Kim, Sang-Yoon;Park, Bo-Gyu;Jung, Jae-Ok;Cho, Kyu-Sang;Chung, Ilsup
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.4
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    • pp.160-168
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    • 2018
  • Among the components of rotary hooks, a core component of an embroidery sewing system, a study was conducted to apply metal injection molding to the manufacture of a hook body and a housing that was very difficult to mechanical working. The correlation of feedstock, a mixture of binder and SCM 415 metal powder, and properties of the pressure-volume-temperature interrelationship, viscosity, specific heat, and thermal conductivity were measured. Injection molds for the hook body and the housing were developed through injection molding analysis using these properties and conducted injection tests. Optimal injection gate position and number, injection pressure, and injection time were obtained through a comparison of analysis results with the experiment results.

A study on the effect of binder properties on feedstock and micro powder injection molding process (마이크로 분말사출성형에서 바인더 물성이 피드스탁 및 성형공정에 미치는 영향에 관한 연구)

  • Lee, Won-sik;Kim, Yong-dae
    • Design & Manufacturing
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    • v.11 no.3
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    • pp.1-7
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    • 2017
  • The fabrication process of micro pattern structure with high precision and high aspect ratio using powder injection molding (PIM) is developed. In the PIM process, the metal powder is mixed with the binder systems and the mixture is injected into the metal mold. The injection molded green parts are debinded and sintered to reach final shape and properties. In this method, the optimization of physical properties such as fluidity and strength of the binder system is essential for perfect filling the high aspect ratio micro-pattern. For this purpose, the correlation between the properties of the binder system and feedstock and ${\mu}-PIM$ process was investigated, and a binder system with low viscosity at low temperature(about $110^{\circ}C$) and high strength after cooling was investigated and applied. Employing this process, high precision parts with line type micro pattern structure which has pattern size $160{\mu}m$ and aspect ratio more than 2 can be manufactured.