Gas-pressure sintered Si3N4 fabricated by ceramics injection molding

With finite element analysis software Moldflow, numerical simulation and studies about FM truck roof handle were conducted on gas-assisted injection molding process. The influences of melt pre-injection shot, gas pressure, delay time and melt temperature were observed by using multi-factor orthogonal experimental method. According to the analysis of the factors' impact on evaluation index, the optimized parameter combination is obtained. Therefore the optimization design of technological parameters is done. The results show that during the gas-assisted injection molding, optimum pre-injection shot is 94%,gas pressure is 15MPa,delay time is 0.5s,melt temperature is 240 oC. This study provided a more practical approach for the gas-assisted injection molding process optimization.

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Evaluation of gas pressure dynamics for gas-assisted injection molding process

International Communications in Heat and Mass Transfer ◽

10.1016/s0735-1933(98)00124-9 ◽

1999 ◽

Vol 26 (1) ◽

pp. 85-93 ◽

Cited By ~ 4

Author(s):

Sher-Meng Chao ◽

Shih-Ming Wang ◽

Shia-Chung Chen ◽

Furong Gao

Keyword(s):

Injection Molding ◽

Gas Pressure ◽

Injection Molding Process ◽

Molding Process ◽

Pressure Dynamics

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Designs and Evaluations of a Gas Atomizer to Fabricate Stainless Steel Metal Powder to Be Applied at a Metal Injection Molding

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.833.40 ◽

2020 ◽

Vol 833 ◽

pp. 40-47 ◽

Cited By ~ 1

Author(s):

Sugeng Supriadi ◽

Tsaome Indah Susimah ◽

Muhammad Haekal Sena Akbar ◽

Bambang Suharno ◽

Ario Sunar Baskoro ◽

...

Keyword(s):

Stainless Steel ◽

Injection Molding ◽

Metal Powder ◽

Spherical Shape ◽

Steel Powder ◽

Gas Pressure ◽

Metal Injection Molding ◽

Powder Morphology ◽

Melt Flow Rate ◽

Significant Difference

Metal Injection Molding (MIM) is an application of Powder Metallurgy (PM) and Plastic Injection Molding currently being developed to produce precisely-small components. Most of the metal applications using PM are stainless steel fabricated by a gas atomizer. In this study, an atomizer is designed and fabricated to produce stainless steel powder by using a free fall gas atomization method. The stainless steel used in this study is AISI 304 atomized with the diameter sizes varying from about 3 mm, 5 mm, and 7 mm. The variables of diameter size results are the lowest melt flow rate produces the smallest mean diameter, but no significant difference on the sphericity of powder morphology. While the gas pressure variation results shows that metal powder with smaller size will be produced more using the high gas pressure. The gas atomizer have successfully produced metal powder with the size <40 μm and have a spherical shape. The well rounded sphericity for melt flowrate 0.41x10-3 m3/min, 1.14 x10-3 m3/min, and 2.24x10-3 m3/min are 60.0%, 36.0%, and 55.2% respectively.

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