Method for increasing density of stainless steel powder metallurgy part

A technology of powder metallurgy and stainless steel, which is applied in the field of powder metallurgy, can solve the problems that the density does not reach the theoretical effect, the ideal density is not reached, and the pressing speed is not high, so as to reduce the delubricating process, increase the green density, improve performance and use The effect of longevity

Inactive Publication Date: 2011-09-14
广州市华维诺科技有限公司
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Problems solved by technology

[0004] Due to the many advantages of powder high-speed compaction technology, researchers in many countries in the world have developed great enthusiasm for this technology and have invested in the ranks of research, and have achieved some results: For example, Deng Sancai et al. In the article "Research on the Forming Law of 316L Stainless Steel Powder Die Wall Lubrication and High-speed Pressing" published at the "Metallurgical Academic Conference", the room temperature high-speed pressing technology was used to press 316L stainless steel powder, and the highest green density was obtained. 7.23g / cm 3 , although it has been greatly improved compared with the traditional pressing, the density has not yet reached the theoretical effect; High, all below 10m / s, the density of the obtained copper powder compact needs to be further improved
The warm-pressing technology of 316L stainless steel powder has also achieved some results: For example, in the article "Research on Warm-pressing Process of 316L Stainless Steel Powder" published by Li Chunxiang et al. Up to 6.92g / cm 3 , which is 0.26g / cm higher than room temperature molding 3 , but far from the ideal density
[0005] Studies have shown that the warm powder high-speed compaction technology combined with high-speed compaction technology and warm compaction technology can effectively increase the density of powder metallurgy products, but this technology has never been applied to stainless steel powder

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  • Method for increasing density of stainless steel powder metallurgy part

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Embodiment 1

[0024] The method for improving the density of stainless steel powder metallurgy parts of the present invention is applicable to stainless steel. The present embodiment takes 316L stainless steel powder as an example, and adopts commercially available 316L stainless steel powder of any brand with two particle sizes. The method includes the following steps:

[0025] (1) Particle size distribution of stainless steel powder:

[0026] Mix and prepare materials according to the following mass percentages: 90% for particle size 44-75 μm, 10% for particle size <44 μm, fully mix in a V-type high-efficiency powder mixer and set aside;

[0027] (2) Adopting the mold wall lubrication technology, the lubricant lithium stearate dehydrated alcohol suspension is evenly coated on the surface of the inner wall of the female mold cavity and the upper and lower die punches;

[0028] (3) Heat the mold to 140±2°C, and heat the uniformly mixed stainless steel powder to 135±2°C;

[0029] (4) Carry ...

Embodiment 2

[0032] A method for increasing the density of stainless steel powder metallurgy parts comprises the steps:

[0033] (1) Particle size distribution of stainless steel powder:

[0034] Mix and prepare materials according to the following mass percentages: 80% for particle size 44-75 μm, 20% for particle size < 44 μm, fully mix in a V-type high-efficiency powder mixer and set aside;

[0035] (2) Adopting the mold wall lubrication technology, the lubricant lithium stearate dehydrated alcohol suspension is evenly coated on the surface of the inner wall of the female mold cavity and the upper and lower die punches;

[0036] (3) Heat the mold to 140±2°C, and heat the uniformly mixed stainless steel powder to 135±2°C;

[0037] (4) Carry out high-speed compression forming stainless steel powder metallurgy parts to the stainless steel mixed powder after heating, this embodiment is respectively 10m / s, 12m / s, 14m / s, 16m / s and 18m / s do relevant experiment with high-speed pressing speed T...

Embodiment 3

[0039] A method for increasing the density of stainless steel powder metallurgy parts comprises the steps:

[0040] (1) Particle size distribution of stainless steel powder:

[0041] Mix and prepare materials according to the following mass percentages: 70% for particle size 44-75 μm, 30% for particle size <44 μm, fully mix in a V-type high-efficiency powder mixer before standby;

[0042](2) Adopting the mold wall lubrication technology, the lubricant lithium stearate dehydrated alcohol suspension is evenly coated on the surface of the inner wall of the female mold cavity and the upper and lower die punches;

[0043] (3) Heat the mold to 140±2°C, and heat the uniformly mixed stainless steel powder to 135±2°C;

[0044] (4) Carry out high-speed compression forming stainless steel powder metallurgy parts to the stainless steel mixed powder after heating, this embodiment is respectively 10m / s, 12m / s, 14m / s, 16m / s and 18m / s do relevant experiment with high-speed pressing speed Th...

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Abstract

The invention discloses a method for increasing the density of a stainless steel powder metallurgy part. The method comprises the following steps of: uniformly mixing 70-90% by mass of stainless steel powder with particle size of 44-75mum and 10-30% by mass of stainless steel powder with particle size of less than 44mum; taking a lithium stearate absolute ethyl alcohol suspension as a die wall lubricant; then respectively heating the mixed powder and the die to 120-160 DEG C; and finally, pressing at high speed of at least 8m / s to form. The density of a green body of the stainless steel powder metallurgy part is increased by 0.04-0.08g / cm<3> as compared with the density of the green body of the stainless steel powder metallurgy part pressed by adopting single 44-75mum warm powder, increased by 0.4g / cm<3> as compared with the density of the green body of the stainless steel powder metallurgy part pressed at room temperature and high speed and increased by 0.7 g / cm<3> as compared with the density of the green body of the stainless steel powder metallurgy part pressed by adopting a warm-pressing technology. In the invention, a warm powder high-speed pressing technology is successfully applied to stainless steel parts, the aim of manufacturing high-performance parts with low cost is achieved, and the development of the high-speed pressing technology in the powder metallurgy field is promoted.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and specifically refers to a method for increasing the density of stainless steel powder metallurgy parts. Background technique [0002] Low-cost manufacturing of high-density, high-strength and high-precision powder metallurgy products is the development direction and research focus of the powder metallurgy industry. Increasing product density will greatly promote the improvement of its performance (especially mechanical properties). In order to increase the density of powder metallurgy products, researchers in the field of powder metallurgy have made unremitting efforts for a long time, and proposed new technologies such as warm pressing, flowing warm pressing, mold wall lubrication, dynamic magnetic pressing, and high-speed pressing, which have promoted the development of powder metallurgy. Industrial development. [0003] High Velocity Compaction (HVC for short) is a low-cost, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/03
Inventor 肖志瑜李超杰林小为张文李元元
Owner 广州市华维诺科技有限公司
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