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Preparation method for iron-based powder metallurgy part with compact surface

An iron-based powder metallurgy and densification technology is applied in the field of preparation of iron-based powder metallurgy parts, which can solve the problems of difficulty in projecting projectiles in place effectively, increase in surface roughness of parts, and decrease in wear resistance of parts, so as to reduce burrs and flashes. generation, reduced energy requirements, and increased density

Active Publication Date: 2016-01-13
连云港富驰智造科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coverage rate of this method is difficult to guarantee. For example, when the tooth root and other parts are shot peened, it is difficult to effectively project the projectile in place, and the depth of the dense layer is shallow after shot peening, and the surface roughness of the part will increase after shot peening. It will reduce the wear resistance of the parts and increase the vibration and noise of the parts

Method used

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  • Preparation method for iron-based powder metallurgy part with compact surface
  • Preparation method for iron-based powder metallurgy part with compact surface
  • Preparation method for iron-based powder metallurgy part with compact surface

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Embodiment 1

[0038] In this embodiment, the preparation method of the iron-based powder metallurgy part with a densified surface comprises the following steps:

[0039] (1) Design material composition: by weight percentage, the material used contains 0.7% carbon, 2% copper, no more than 2% unavoidable impurities, and iron in the balance;

[0040] (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;

[0041] (3) Compression: The mixture obtained in step (2) is pressed into a density of 7.1g / cm under a pressure of 600MPa 3 green parts, such as Figure 5 shown;

[0042] (4) Sintering: Sinter the green body of the parts obtained in step (3) in a vacuum furnace, the sintering temperature is 1200°C, and the sintering time is 20min;

[0043] (5) Annealing: Anneal the sintered parts in a nitrogen atmosphere, the annealing temperatu...

Embodiment 2

[0048] In this embodiment, the preparation method of the iron-based powder metallurgy part with a densified surface comprises the following steps:

[0049] (1) Design material composition: by weight percentage, the material used contains 0.8% carbon, 3% chromium, unavoidable impurities not exceeding 1%, and iron in the balance;

[0050] (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;

[0051] (3) Compression: The mixture obtained in step (2) is pressed to a density of 7.2g / cm under a pressure of 700MPa 3 green parts, such as Image 6 shown;

[0052] (4) Sintering: sintering the green body of the part obtained in step (3) in a nitrogen-hydrogen atmosphere containing 20 vol% of hydrogen, the sintering temperature is 1120° C., and the sintering time is 30 minutes;

[0053] (5) Annealing: Anneal the sintered p...

Embodiment 3

[0058] In this embodiment, the preparation method of the iron-based powder metallurgy part with a densified surface comprises the following steps:

[0059] (1) Design material composition: by weight percentage, the materials used include copper 2%, nickel 10%, chromium 6%, unavoidable impurities not exceeding 2%, and iron in the balance;

[0060] (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;

[0061] (3) Compression: the mixture obtained in step (2) is pressed to a density of 6.6g / cm under a pressure of 600MPa 3 green parts, such as Figure 7 shown;

[0062] (4) Sintering: Sinter the green parts obtained in step (3) in a nitrogen-hydrogen atmosphere containing 10 vol% hydrogen, the sintering temperature is 1000°C, and the sintering time is 180min;

[0063] (5) extrusion: such as figure 1 As shown, the ext...

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Abstract

The invention relates to a preparation method for an iron-based powder metallurgy part with a compact surface. An extrusion female die used for extruding the outer surface of the part and an extrusion mandrel used for extruding the inner surface of the part are specially designed, and an upper punching die and a lower punching die which can clamp the part are used in an auxiliary manner. In the use process, the part is fixed, the corresponding extruding dies are moved to complete extrusion, and by means of the manner, the defect that the part cracks when die stripping is conducted after extrusion is completed can be overcome. Compared with energy required when surface plasticity compaction is conducted after the sintering step in the prior art, the large deformation depth can be obtained through small extrusion allowance, the energy requirement is remarkably lowered, the production cost is reduced, the compaction degree is improved, the overall product density can exceed 7.60 g / cm<3> after extrusion, the product surface relative density can reach 99% or above after extrusion, the compact layer coverage rate is high, and therefore the iron-based powder metallurgy part can have the beneficial effects of being high in precision and strength.

Description

technical field [0001] The invention relates to a preparation method of an iron-based powder metallurgy part with a densified surface. Background technique [0002] Powder metallurgy parts are widely used in automobiles and home appliances due to their advantages of high production efficiency, high material utilization rate and low cost. However, since the powder metallurgy material itself has a certain porosity, this will have a strong impact on the strength of the powder metallurgy parts. Improving the strength and mechanical properties of powder metallurgy parts can expand the application range of powder metallurgy products. Therefore, improving the structure and eliminating pores has become the strengthening target of powder metallurgy parts. Some conventional components mostly work under cyclically changing loads, fatigue fracture is one of the main failure modes, and plastic densification of the surface of parts is a very economical and effective method to improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F3/10B22F3/20
Inventor 朱锋包崇玺王劲松詹学救
Owner 连云港富驰智造科技有限公司
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