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

Active Publication Date: 2016-09-07
DONGGUAN HUAJING POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This degreasing process is relatively complicated, and under solvent degreasing, the green body is prone to swelling in the solvent, which affects the quality of the green body
And the solvent is generally selected trichlorethylene or chloropropane, these solvents are usually poisonous
In addition, catalytic degreasing binders have also been proposed at present. However, this kind of binder requires a large investment in equipment, and the binder decomposes under the action of an acidic atmosphere, and the cracked products are also toxic, and the overall damage to the environment is relatively large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

Disclosed are a powder injection molding feedstock preparing method and a powder injection molding method. The powder injection molding feedstock preparing method includes: stirring and heating 80% to 94%, preferably 85% to 94%, by percent, of forming powder in an internal mixer, adding 6% to 20%, preferably 6% to 15%, by percent, of binder component when the forming powder is heated to 180 DEG C to 200 DEG C, and continuing stirring for 60min to 120min according to the mixing temperature 175 DEG C to 195 DEG C, preferably at the mixer speed 10rpm to 30rpm, thus obtaining evenly mixed feedstock. The powder injection molding method includes performing injection molding and degreasing sintering with the feedstock. The powder injection molding feedstock preparing method and the powder injection molding method have the advantages that degreasing efficiency is high, the process is simple and easy to control, blank quality is good and the methods are sanitary and environment friendly.

Description

technical field [0001] The invention relates to a method for preparing feedstock for powder injection molding and a production method for powder injection molding. Background technique [0002] Powder injection molding technology is a molding method that injects the mixture of metal or ceramic powder and binder into the mold cavity. It combines mature modern polymer injection molding and powder metallurgy technology, and has a one-time molding It has the advantages of producing complex-shaped workpieces, high dimensional accuracy, no need for machining, and easy to realize high-efficiency automatic production. It is especially suitable for mass production of small mechanical parts with complex shapes, high precision, and high-performance materials. It is an advanced Parts processing technology, especially in recent years, has been widely used in the communication industry and more high-tech industries, and has become a rapidly developing new technology field. [0003] The b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22
Inventor 朱建军
Owner DONGGUAN HUAJING POWDER METALLURGY
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