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A preparation method of copper-based powder metallurgy parts with densified surface

A powder metallurgy and densification technology, applied in the field of preparation of copper-based powder metallurgy parts, can solve the problems of insufficient use of powder metallurgy process advantages, high manufacturing cost, long manufacturing process, etc., so as to reduce burrs and flashes. The effect of producing, reducing production cost and prolonging life

Active Publication Date: 2017-06-20
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the recompression and refiring process, the manufacturing process of the parts is long, the manufacturing cost is high, and the advantages of the powder metallurgy process cannot be fully utilized.

Method used

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  • A preparation method of copper-based powder metallurgy parts with densified surface
  • A preparation method of copper-based powder metallurgy parts with densified surface
  • A preparation method of copper-based powder metallurgy parts with densified surface

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Embodiment 1

[0033]The preparation method of the copper-based powder metallurgy parts with densified surface in this embodiment comprises the following steps:

[0034] (1) Design material composition: by weight percentage, the materials used include 0.15% carbon, 15% tin, no more than 2% unavoidable impurities and the balance of copper;

[0035] (2) Mixing: According to the material composition of step (1), each component is mixed to obtain a mixed powder, and a lubricant accounting for 0.5% of the total mass of the mixed material is added to the mixed powder;

[0036] (3) Compression: The mixture obtained in step (2) is pressed under a pressure of 400MPa to a density of 6.0g / cm 3 green parts, such as image 3 shown;

[0037] (4) Sintering: Sinter the green parts obtained in step (3) in a vacuum furnace, the sintering temperature is 700°C, and the sintering time is 180min;

[0038] (5) extrusion: such as figure 1 As shown, the extrusion female die A used in this step has an extrusion c...

Embodiment 2

[0041] The preparation method of the copper-based powder metallurgy parts with densified surface in this embodiment comprises the following steps:

[0042] (1) Design material composition: by weight percentage, the materials used contain no more than 2% of unavoidable impurities and the balance of copper;

[0043] (2) Mixing: According to the material composition of step (1), each component is mixed to obtain a mixed powder, and a lubricant accounting for 0.1% of the total mass of the mixed material is added to the mixed powder;

[0044] (3) Compression: The mixture obtained in step (2) is compressed into a density of 6.8g / cm under a pressure of 500MPa 3 green parts, such as image 3 shown;

[0045] (4) Sintering: Sinter the green part obtained in step (3) in a nitrogen-hydrogen atmosphere containing 20 vol% of hydrogen, the sintering temperature is 1090° C., and the sintering time is 5 minutes;

[0046] (5) extrusion: such as figure 2 As shown, the outer surface of the e...

Embodiment 3

[0049] The preparation method of the copper-based powder metallurgy parts with densified surface in this embodiment comprises the following steps:

[0050] (1) Design material composition: by weight percentage, the materials used include 0.8% carbon, 4% tin, 25% nickel, 5% zinc, 3% bismuth, no more than 2% of unavoidable impurities and the balance of copper;

[0051] (2) Mixing: According to the material composition of step (1), each component is mixed to obtain a mixed powder, and a lubricant accounting for 1% of the total mass of the mixed material is added to the mixed powder;

[0052] (3) Compression: The mixture obtained in step (2) is compressed into a density of 6.8g / cm under a pressure of 450MPa 3 green parts, such as image 3 shown;

[0053] (4) Sintering: sintering the green body of the part obtained in step (3) in a nitrogen-hydrogen atmosphere containing 10 vol% of hydrogen, the sintering temperature is 850° C., and the sintering time is 45 minutes;

[0054] (5)...

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Abstract

The invention relates to a method for preparing a copper-based powder metallurgy part with a densified surface. In order to make the prepared copper-based powder metallurgy part have better density and strength, the invention designs an extrusion process for extruding the outer surface of the part. The die and the extrusion mandrel on the inner surface of the extruded part are supplemented by an upper punching die and a lower punching die that can clamp the part. When in use, the part is fixed and the corresponding extrusion die is moved to complete the extrusion. Such a method can avoid the defect that cracks are prone to appear in the part after the extrusion is completed; compared with the energy required for the surface plastic densification after the sintering step in the prior art, the present invention can use less extrusion The margin gets a larger deformation depth, and significantly reduces the energy demand, thereby reducing the production cost and improving the degree of densification; the shape of the prepared blank part is closer to the shape of the final product, so the extrusion margin is small, and the impact on the mold The loss is small, which prolongs the life of the mold to a certain extent.

Description

technical field [0001] The invention relates to a preparation method of a copper-based powder metallurgy part with a densified surface. Background technique [0002] Powder metallurgy is a process technology for producing metal powder or using metal powder (or a mixture of metal powder and non-metal powder) as raw material, forming and sintering to manufacture metal materials, composite materials and various types of products. The powder metallurgy method has similarities with the production of ceramics, and both belong to the powder sintering technology. Therefore, a series of new powder metallurgy technologies can also be used for the preparation of ceramic materials. Due to the advantages of powder metallurgy technology, it has become the key to solve the problems of new materials and plays a pivotal role in the development of new materials. Powder metallurgy parts are widely used in automobiles, home appliances, etc. due to their advantages of saving raw materials, ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F3/24C22C9/02C22C9/06C22C9/04C22C9/00C22C30/06
Inventor 朱锋包崇玺王劲松詹学救
Owner NBTM NEW MATERIALS GRP
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