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Investigation of Applying Gas Counter Pressure (GCP) Technology in Improving Metal Injection Molding Flow Characteristics and Molded Part's Quality

机译:燃气柜台压力(GCP)技术在改善金属注塑流动特性和模压部分质量方面的研究

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Metal Injection Molding (MIM) is a combination between injection molding and powder metallurgy process. The process bolsters a mass-production manufacturing of small, complex, precise parts as a molded part undergoes de-binding and sintering stages right after the molding one. Most of the MIM studies focus on how to treat the feedstock while to control the distribution of powder concentration and density through the process settings, for example, melt temperature, mold temperature, and injection speed is still less discovered. Therefore, this study investigates the effects of those settings on flow characteristics and molded part's quality which focuses on the green part. Moreover, Gas Counter Pressure (GCP) technology is carried out to improve the process. Numerical approach along with SEM analysis is also conducted for verification, and the results exhibit that an anisotropic behavior occurs in experiment with different temperature and speed settings. In addition, both experiment and simulation have demonstrated that GCP implementation can improve both process and part's quality; the shear stress is reduced up to 98.49%, and the density can be increased up to 1.43% in experiment and 0.01% in simulation.
机译:金属注射成型(MIM)是注塑和粉末冶金工艺之间的组合。该过程突破了批量生产的批量生产,作为模塑部件在模制品之后经历过结合和烧结阶段。大多数MIM研究专注于如何治疗原料,同时通过工艺设置控制粉末浓度和密度的分布,例如熔体温度,模具温度和注射速度仍然不太发现。因此,本研究调查了这些环境对流动特性和模压部分质量的影响,这些部分的重点在绿色部分上。此外,进行气体反压(GCP)技术以改善该过程。还进行了数值方法以及SEM分析进行验证,结果表明,在具有不同温度和速度设置的实验中发生各向异性行为。此外,两者的实验和仿真都表明,GCP实施可以改善过程和部分的质量;剪切应力降低高达98.49%,并且在实验中的密度高达1.43%,模拟中的0.01%。

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