Powder injection molding feedstock preparing method and powder injection molding 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: 2015-06-03
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 powder injection molding feed preparation method includes: putting 85-94% of the molding powder calculated by mass percentage into an 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 head of the internal mixer, and continue stirring for 60~120min according to the internal mixer speed of 10~30 revolutions / min and mixing temperature of 175~195℃. A uniformly mixed feed is obtained. Preferably, the method further passes the uniformly mixed feed through a granulator to obtain a pellet 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% carnauba wax, 15-30% first polymer, 10-20% second polymer, and 1-5% surfactant, wherein the first polymer And the second high ...

example 1

[0049] Weigh 9.1kg 316L metal powder with 1000 meshes, stir and heat it in an internal mixer, heat to 190℃, add binder components: liquid paraffin 45g, stearic acid 45g, naphthalene 90g, solid paraffin 135g, microcrystalline wax 180g, carnauba wax 90g, polyethylene 180g, polypropylene 135g, then press the head of the internal mixer, set the mixing temperature to 180°C, and the rotor speed to 15 revolutions / min. After stirring for 90 minutes, take out the evenly mixed feed. The feed material for injection molding is made by a twin-screw granulator.

[0050] The 316L metal feed is injected by a molding machine into a green sample with a thickness of 2mm. Put it directly into the powder metallurgy vacuum sintering furnace, and control the temperature in the furnace to rise 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 speed, volume expansion and bubbling will not occur in the green body, and it can be compl...

example 2

[0052] Weigh 8.5kg of zirconia ceramic powder with a diameter of 50nm, add it to the internal mixer, stir and heat, heat to 200°C, add the binder components: liquid paraffin 75g, stearic acid 45g, naphthalene 225g, solid paraffin 225g , Microcrystalline wax 180g, carnauba wax 225g, polyethylene 375g, polypropylene 150g, then press the head of the internal mixer, set the mixing temperature to 190℃, the rotor speed 10 revolutions / min, continue stirring for 120 minutes, and mix well The feed is taken out and made into feed for injection molding through a single screw granulator.

[0053] The zirconia ceramic feed is injected by a molding machine into a green sample with a thickness of 2 mm. Put it directly into the ceramic atmosphere sintering furnace, and under the protection of nitrogen atmosphere during thermal desorption, control the temperature in the furnace from room temperature to 600°C at a heating rate of 3.5°C / min. When the temperature is raised at this speed, volume exp...

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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 powder injection molding feed preparation method and a powder injection molding production method. Background technique [0002] Powder injection molding technology is a molding method in which a mixture of metal or ceramic powder and binder is injected into the mold cavity. It combines mature modern polymer injection molding with powder metallurgy technology, and has one-time molding It has the advantages of producing complex-shaped workpieces, high dimensional accuracy, no need for machining, and easy realization of high-efficiency automated 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 the communications industry and more high-tech industries in recent years, has been widely used, and has become a rapidly developing new technology field. [0003] Powder injection ...

Claims

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Application Information

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