A kind of 304l stainless steel metal powder injection molding method

An injection molding and metal powder technology, which is applied in the field of 304L stainless steel metal powder injection molding, can solve the problems of unsatisfactory dimensional accuracy and surface accuracy, easy defects in degreasing products, and complicated degreasing process, so as to achieve low production cost and high production efficiency. , to avoid the effect of complex processes

Inactive Publication Date: 2017-09-29
重庆地恩科技开发有限责任公司
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  • Application Information

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Problems solved by technology

Patent 201110164890.6 discloses a one-time forming process for optical communication component seats, and introduces the injection molding process of 304 stainless steel, but solvent degreasing and thermal degreasing are used, the degreasing process is relatively complicated, the degreasing speed is slow, and the degreasing products are prone to defects. Deformation, and the dimensional accuracy and surface accuracy of the product are not ideal

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  • A kind of 304l stainless steel metal powder injection molding method
  • A kind of 304l stainless steel metal powder injection molding method

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Embodiment 1

[0024] The 304L stainless steel metal powder injection molding method of embodiment 1 may further comprise the steps:

[0025] (1) Prepare binder according to the following weight percentages: polyoxymethylene 86%, high-density polyethylene 8%, polypropylene 2%, paraffin 4%; 304L stainless steel powder and binder are mixed according to the volume ratio of 1:2 kneading, the kneading temperature is 170°C, the kneading time is 1.5h, and then granulated on the granulator to make feed;

[0026] (2) Add the feed material obtained in step (1) into the injection molding machine for injection molding, the injection temperature is 160°C, the injection pressure is 70MPa, the mold temperature is 120°C, and a blank is prepared;

[0027] (3) the blank that step (2) is obtained is placed in catalytic degreasing furnace and is carried out catalytic degreasing with nitric acid gas as catalyzer, and nitric acid gas feed rate is 1.6L / h, and nitrogen gas feed rate is 2L / h, and degreasing temperat...

Embodiment 2

[0030] The 304L stainless steel metal powder injection molding method of embodiment 2 comprises the following steps:

[0031] (1) Prepare binder according to the following weight percentage: polyoxymethylene 89%, high-density polyethylene 5%, polypropylene 2%, paraffin 4%; 304L stainless steel powder and binder are mixed according to the volume ratio of 1:3 kneading, the kneading temperature is 180°C, the kneading time is 1.8h, and then granulated on the granulator to make feed;

[0032] (2) Add the feed material obtained in step (1) into the injection molding machine for injection molding, the injection temperature is 180°C, the injection pressure is 100MPa, the mold temperature is 120°C, and a blank is prepared;

[0033] (3) the blank that step (2) is obtained is placed in catalytic degreasing furnace and is carried out catalytic degreasing with nitric acid gas as catalyzer, and nitric acid gas feed rate is 2L / h, and nitrogen gas feed rate is 2.3L / h, and degreasing temperatu...

Embodiment 3

[0036] The 304L stainless steel metal powder injection molding method of embodiment 3 comprises the following steps:

[0037] (1) Prepare binder according to the following weight percentages: polyoxymethylene 91%, high-density polyethylene 4%, polypropylene 2%, paraffin 3%; 304L stainless steel powder and binder are mixed according to the volume ratio of 1:4 Mixing, the mixing temperature is 195°C, the mixing time is 1.5h, and then granulated on the granulator to make feed;

[0038] (2) Add the feed material obtained in step (1) into the injection molding machine for injection molding, the injection temperature is 190°C, the injection pressure is 120MPa, the mold temperature is 125°C, and a blank is prepared;

[0039] (3) Place the blank that step (2) obtains in the catalytic degreasing furnace and use nitric acid gas as a catalyst to carry out catalytic degreasing. 130°C, the degreasing time is 3h, and the degreasing base is obtained, and the degreasing rate of the defatting...

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Abstract

The invention discloses a method for injection molding of 304L stainless steel metal powder, which comprises mixing and granulating 304L stainless steel powder and binder to make feed material, preparing blanks by injection molding, catalytic degreasing and negative pressure degreasing, vacuum internal firing and forced Cooling three-stage atmosphere process sintering and other steps. The 304L stainless steel part obtained by the invention has high dimensional precision, high surface precision and no burr phenomenon, and the invention avoids complicated processes of solvent degreasing and thermal degreasing, and has high production efficiency and low production cost.

Description

technical field [0001] The invention relates to the technical field of metal injection molding, in particular to a 304L stainless steel metal powder injection molding method. Background technique [0002] Metal injection molding (Metal Injection Molding, MIM) is a molding method that injects a plasticized mixture of metal powder and its binder into a mold. It is a new forming technology developed on the basis of traditional powder metallurgy technology and creatively combining injection molding technology of plastic industry. MIM can produce parts with very complex shapes, and can make the parts of the final shape to the maximum extent without subsequent machining or with a minimum amount of machining. It is suitable for mass production and has high production efficiency. [0003] Powder injection molding stainless steel has good corrosion resistance and is widely used in machinery, chemical industry, shipbuilding, automobile, instrumentation and other industries. Patent 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F3/22
Inventor 陈慧刘兵敬小龙张艳华彭玲玲邓莹
Owner 重庆地恩科技开发有限责任公司
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