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Preparation method of powder injection molded feeding material

A technology of powder injection molding and powder, which is applied in the field of powder injection molding feed preparation, can solve the problems of increasing labor intensity of workers, low equipment utilization rate, long process time, etc., and achieves short preparation process cycle, high equipment utilization rate, The effect of simple process

Active Publication Date: 2014-12-24
DONGGUAN HUAJING POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned preparation methods all have the disadvantages of multiple feeding and cumbersome operation, resulting in long process time, high energy consumption, low utilization rate of equipment, and increased labor intensity of workers

Method used

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  • Preparation method of powder injection molded feeding material
  • Preparation method of powder injection molded feeding material

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preparation example Construction

[0019] The invention provides a preparation method of powder injection molding feed, comprising the following steps:

[0020] S1. Grinding the organic high molecular polymer used as the binder component to the same particle size level as the inorganic material powder to be mixed. For example, ultra-low temperature pulverization, such as pulverization at -50°C or below, can be used.

[0021] S2. Heating the inorganic material powder to a predetermined temperature, the predetermined temperature being a temperature capable of melting the binder;

[0022] S3. Add the binder processed in step S1 to the powder raw material that has reached the predetermined temperature and mix, so that the powder raw material and the binder are pre-bonded into agglomerates, wherein the binder includes the powder treated in step S1. of organic polymers;

[0023] S4. Sending the material processed in step S3 into an extruder, plasticizing, extruding, and granulating to obtain a powder injection mold...

Embodiment 1

[0037] This embodiment provides a method for preparing feedstock for stainless steel powder injection molding, which belongs to the field of metal powder injection molding, and the specific process is as follows:

[0038] 1) Provide stainless steel powder to be mixed, the stainless steel powder used is obtained by, for example, hydrometallurgical chemical engineering method, and the particle size is roughly 0.5-3 μm;

[0039] 2) Provide raw materials for binders: polyoxymethylene copolymer, modified K resin, fully refined paraffin wax, polypropylene wax, polyacrylamide, antioxidant, and the copolymerized polyoxymethylene and modified K resin are subjected to ultra-low temperature below -50°C Deep crushing, crushing to a particle size of less than 80 μm, which is at the same particle size level as stainless steel powder;

[0040] 3) Take 10% of fully refined paraffin wax, 1.5% of polypropylene wax, 1% of polyacrylamide, 0.5% of antioxidant, and 80% of polyoxymethylene and 7.5% ...

Embodiment 2

[0045] This embodiment provides a method for preparing cermet powder injection molding feed, which belongs to the field of metal injection molding, wherein the cermet can be titanium carbonitride-based cermet, for example: TiCN-(5~15)% (W-Ta / Nb-V / Cr)C-(10~30)%Co / Ni, the specific process is as follows:

[0046] 1) Provide cermet powder with a particle size of 0.5-3 μm to be mixed;

[0047] 2) Provide raw materials for binders: polyoxymethylene copolymer, modified K resin, fully refined paraffin wax, polypropylene wax, polyacrylamide, antioxidant, and the values ​​of polyoxymethylene copolymer and modified K are respectively subjected to ultra-low temperature below -50°C Deep crushing, crushed to less than 80μm, at the same particle size level as cermet powder;

[0048] 3) Take 10% of fully refined paraffin wax, 1% of polypropylene wax, 1% of polyacrylamide, 0.5% of antioxidant, and 77.5% of polyoxymethylene processed through process 2) and 10% of modified K resin by volume pe...

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Abstract

The invention discloses a preparation method of a powder injection molded feeding material, which is applied to MIM (Metal Power Injection Molding) and CIM (Ceramic Power Injection Molding). The method comprises the following steps of S1, pre-treating, i.e. crushing an organic macromolecule polymer serving as a component of an adhesive into the powder with the same grain size as that of inorganic material powder to be mixed; S2, heating the inorganic material powder to the temperature at which the adhesive can be melted; S3, adding the adhesive into the pre-heated inorganic material powder to be mixed, so that the inorganic material powder and the adhesive are pre-felted into a block, wherein the adhesive comprises the organic macromolecule polymer which is treated in the step 1; S4, extruding the block to form particles, i.e. feeding the material treated in the step 3 into an extruder, and plasticizing, extruding and pelletizing the material to manufacture the powder injection molded feeding material. Due to the fact that the organic macromolecule polymer in the adhesive is crushed before mixing materials, after being added into the pre-heated inorganic material powder, the adhesive can be quickly melted and felted with the powder to form the block, the technical period is shortened, the energy consumption is reduced, and the low-melting point adhesive is prevented from being degraded and volatilized.

Description

technical field [0001] The invention relates to the field of powder injection molding, in particular to a method for preparing feedstock for powder injection molding. Background technique [0002] The traditional powder injection molding feed preparation method is to mix the powder raw material (metal powder or ceramic powder) and the binder raw material (which plays a shape-retaining role in injection molding, and can also be called a molding agent). The mixing method is generally It is to add high-melting-point binder raw materials to melt first, then lower the temperature, add low-melting-point binder raw materials, and then add metal powder or ceramic powder in batches. This can prevent the low-melting-point binder material from vaporizing or decomposing, and adding metal powder or ceramic powder in batches can prevent the rapid increase of torque caused by too fast cooling and reduce equipment loss. For the feeding method of powders with different particle sizes, the J...

Claims

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Application Information

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IPC IPC(8): B22F3/22B28B1/24
Inventor 庞前列
Owner DONGGUAN HUAJING POWDER METALLURGY
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