The Distortion of Injection Molded Stainless Steel Powder Compact during Sintering.

Takekawa, Junjiro

doi:10.2497/jjspm.40.484

Cited by 4 publications

(2 citation statements)

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“…However, in the case of the large sized parts, it becomes difficult to control the distortion and cracking because of the remained binder in the thick part and the large shrinkage during debinding and sintering process 2,3) . These defects were affected by gravity, friction and inhomogeneity of green density [4][5][6] . Therefore it is necessary to optimize the condition of each process to reduce the distortion in the case of large sized MIM components.…”

Section: Introductionmentioning

confidence: 99%

Control the Distortion of the Large and Complex Shaped Parts by the Metal Injection Molding Process

Hashikawa

Osada

Kudo

et al. 2016

J. Jpn. Soc. Powder Powder Metallurgy

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Metal Injection Molding (MIM) is an effective way to manufacture small components with low cost and high precision. However, in the case of large components, it becomes difficult to control the distortion and cracking because of the big shrinkage during debinding and sintering process. Therefore it is important to optimize the condition of each process to reduce the distortion of MIM compacts. Moreover, powder size is also one of the most important parameters. The small particle powder shows high shrinkage and high density as compared to large particle powder during sintering process. In this study, blending of both powders was conducted and the influence of powder size distribution on the distortion of complex shaped parts was evaluated. A coordinate measuring machine, which is a 3D device for measuring the physical geometrical characteristics of an object, was used to measure the distortion. Finally, through controlling the distribution of particle size, distortion of the comparatively large and complex shaped MIM compacts was successfully restrained.

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Section: Introductionmentioning

confidence: 99%

Control the Distortion of the Large and Complex Shaped Parts by the Metal Injection Molding Process

Hashikawa

Osada

Kudo

et al. 2016

J. Jpn. Soc. Powder Powder Metallurgy

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“…Serious defects and distortions may also occur during solvent debinding if the debinding temperature, binder types, and binder amounts selected are inadequate [5,6]. Further defects, such as exfoliation, blistering, and non-uniform shrinkage, can also occur during thermal debinding and sintering if the selected heating schedules, setter plates, or powders are inappropriate [7][8][9][10]. When all these factors have been considered and controlled well, the dimensional control achieved is still not comparable to that possible with many other manufacturing processes.…”

Section: Introductionmentioning

confidence: 99%

Improvements in sintered density and dimensional stability of powder injection-molded 316L compacts by adjusting the alloying compositions

2006

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Effect of Heating Rate and Phase Transformation on the Dimensional Control of Ferrous PIM Compacts

Shu

Hwang

2005

Mater. Trans.

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Powder injection molded (PIM) parts usually show large amounts of shrinkage after sintering due to the low powder loading, resulting in poor dimensional stability. This problem is further aggravated when a high shrinkage rate occurs or when the furnace temperature is not uniform. To alleviate this dimensional control problem, the effects of the phase transformation, sintering temperature, and heating rate were investigated. The results show that when an abrupt volume change occurs, as happens during the ! phase transformation of iron, the dimensional stability deteriorates. This problem gets worse when the density of the part is low. By slowing down the heating rate in the region where the high shrinkage rate occurs, avoiding the phase changes, and adding alloying elements to broaden the temperature range of the phase transformation, the dimensional control of ferrous PIM compacts can be improved.

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The Distortion of Injection Molded Stainless Steel Powder Compact during Sintering.

Cited by 4 publications

References 0 publications

Control the Distortion of the Large and Complex Shaped Parts by the Metal Injection Molding Process

Control the Distortion of the Large and Complex Shaped Parts by the Metal Injection Molding Process

Improvements in sintered density and dimensional stability of powder injection-molded 316L compacts by adjusting the alloying compositions

Effect of Heating Rate and Phase Transformation on the Dimensional Control of Ferrous PIM Compacts

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