Powder injection molding feed preparation method and powder injection molding production method
A powder injection molding and production method technology, applied in the field of powder injection molding feed preparation, can solve the problems of large equipment investment, toxic cracking products, environmental hazards, etc. Effect
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preparation example Construction
[0044] According to various embodiments of the present invention, the method for preparing feedstock for powder injection molding includes: putting 85-94% of the molding powder calculated by mass percentage into the internal mixer for stirring and heating, and when the powder is heated to 180-200°C , add 6-15% of the binder component calculated by mass percentage, press down the pressure head of the internal mixer, and continue stirring for 60-120 minutes according to the speed of the internal mixer at 10-30 rpm and the mixing temperature at 175-195°C, To obtain uniformly mixed feed, preferably, the method further passes the uniformly mixed feed through a granulator to obtain granular feed. Wherein, the binder includes the following components calculated by mass percentage: 5-10% liquid paraffin, 5-15% naphthalene, 15-20% solid paraffin, 10-20% microcrystalline wax, 15% ~20% of carnauba wax, 15~30% of the first high molecular polymer, 10~20% of the second high molecular polyme...
example 1
[0049] Weigh 1000 mesh 9.1kg316L metal powder, add it into the internal mixer for stirring and heating, heat to 190°C, add binder components: 45g liquid paraffin, 45g stearic acid, 90g naphthalene, 135g solid paraffin, microcrystalline wax 180g, carnauba wax 90g, polyethylene 180g, polypropylene 135g, then press down the pressure head of the internal mixer, set the mixing temperature to 180°C, the rotor speed to 15 rpm, and continue to stir for 90min, then take out the evenly mixed feed, Feedstock for injection molding was made by a twin-screw pelletizer.
[0050] The 316L metal feedstock is injected into a green part sample with a thickness of 2mm by a molding machine. Put it directly into a powder metallurgy vacuum sintering furnace, and control the temperature in the furnace from room temperature to 600°C at a heating rate of 2.5°C / min during heat removal. When the temperature is raised at this rate, volume expansion and bubbling will not occur in the green part, and it ca...
example 2
[0052] Weigh 8.5kg of zirconia ceramic powder with a diameter of 50nm, add it to an internal mixer, stir and heat, heat to 200°C, add binder components: 75g liquid paraffin, 45g stearic acid, 225g naphthalene, 225g solid paraffin , microcrystalline wax 180g, carnauba wax 225g, polyethylene 375g, polypropylene 150g, then press down the pressure head of the internal mixer, set the mixing temperature to 190°C, the rotor speed to 10 rpm, continue to stir for 120min, and mix well The feed is taken out and passed through a single-screw pelletizer to make feed for injection molding.
[0053] The zirconia ceramic feedstock is injected into a green part sample with a thickness of 2 mm through a molding machine. Put it directly into the ceramic atmospheric sintering furnace, and control the temperature in the furnace from room temperature to 600°C at a heating rate of 3.5°C / min under the protection of a nitrogen atmosphere during heat removal. When the temperature is raised at this rat...
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