Preparation method of powder metallurgy part

A powder metallurgy and parts technology, applied in the field of powder metallurgy parts preparation, can solve the problem of inability to achieve axial surface densification, and achieve the effects of small equipment footprint, reduced production costs, and uniform densification depth

Pending Publication Date: 2021-06-18
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above preparation method is mainly aimed at the parts that require high radial strength, and cannot achieve surface densification in the axial direction (end face).

Method used

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  • Preparation method of powder metallurgy part
  • Preparation method of powder metallurgy part
  • Preparation method of powder metallurgy part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Prepare the raw materials, use sintered steel, such as mixed powder of iron, copper and carbon, the ratio is: atomized iron powder is 96.8%, carbon is 0.70%, copper powder is 2%, and then the content is 0.5% lubricants;

[0037] 2) Compress the above mixed powder to a density of 7.10g / cm under a pressure of 600MPa 3 green powder metallurgy parts;

[0038]3) Sintering: The powder metallurgy part is sintered at a sintering temperature of 1200° C., and the sintering time is 20 minutes, and the sintering is carried out in a vacuum sintering furnace;

[0039] 4) Annealing: place the sintered part in step 3) in a non-oxidizing atmosphere for annealing, the annealing temperature is 750°C, and the annealing time is 5 minutes;

[0040] 5) Ultrasonic end face densification: Ultrasonic impact shot peening equipment is used for end face densification. First impact with bearing steel shot with a diameter of 4mm for 60s, and then impact with a bearing steel shot with a diameter...

Embodiment 2

[0044] 1) Prepare raw materials, use sintered steel, such as mixed powder of iron, copper and carbon, the ratio is: atomized iron powder is 96.8%; carbon is 0.70%, copper powder is 2%, and then the content is added to 0.5% lubricants;

[0045] 2) Compress the above mixed powder to a density of 7.10g / cm under a pressure of 600MPa 3 green powder metallurgy parts;

[0046] 3) Sintering: The powder metallurgy part is sintered at a temperature of 1120° C., and the sintering time is 25 minutes, and the sintering is carried out in a vacuum sintering furnace;

[0047] 4) Annealing: place the sintered part in step 3) in a non-oxidizing atmosphere for annealing, the annealing temperature is 1000°C, and the annealing time is 60 minutes;

[0048] 5) Ultrasonic end face densification: Ultrasonic impact shot peening equipment is used for end face densification. Impact with bearing steel shot with a diameter of 3mm for 120s, and then impact with a bearing steel shot with a diameter of 2mm...

Embodiment 3

[0051] 1) Prepare the raw materials, that is, the mixed powder of iron, copper and carbon, the ratio of which is: 96.8% of atomized iron powder; 0.70% of carbon, 2% of copper powder, and then add lubricant with a content of 0.5%;

[0052] 2) Compress the above mixed powder to a density of 7.10g / cm under a pressure of 600MPa 3 green powder metallurgy parts;

[0053] 3) Sintering: The powder metallurgy part is sintered at a temperature of 1120° C., and the sintering time is 25 minutes, and the sintering is carried out in a mesh belt sintering furnace;

[0054] 4) Annealing: place the sintered part in step 3) in a non-oxidizing atmosphere for annealing, the annealing temperature is 950°C, and the annealing time is 200min;

[0055] 5) Ultrasonic end face densification: Ultrasonic impact shot peening equipment is used for end face densification. The bearing steel shot with a diameter of 4mm is impacted for 120s, the densification depth is 320μm, the surface roughness Ra after den...

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Abstract

The invention relates to a preparation method of a powder metallurgy part. The preparation method is characterized by comprising the following steps of material composition design, pressing, sintering, annealing, ultrasonic end face densification and heat treatment. According to the preparation method of the powder metallurgy part, densification treatment on the axial surface is achieved, compared with a traditional powder metallurgy process, the density of a product is higher, the local density can exceed 7.60 g / cm<3> and is close to the level of powder forging, the relative surface density can reach 99% or above, and surface densification is basically achieved.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and in particular relates to a preparation method of powder metallurgy parts. Background technique [0002] Powder metallurgy is the technical discipline of manufacturing metal powder and using metal powder (including mixed non-metal powder) as raw material to manufacture materials or products by the basic method of forming and sintering. In a broad sense, it also includes the technology of manufacturing materials or products by forming-sintering methods using non-metallic compound powders such as oxides, nitrides, and carbides as raw materials. The powder metallurgy process is a technical process in which raw material powder is added into a certain mold cavity, pressurized and formed, and then sintered under certain conditions, or sintered in a specific mold to obtain a product. With the development of industry, powder metallurgy is a technology that can manufacture parts with complex shapes, w...

Claims

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Application Information

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IPC IPC(8): B22F3/02B22F3/10B22F3/24C22C38/08C22C38/12C22C38/16C22C38/42C22C38/44
CPCB22F3/02B22F3/24B22F3/1007C22C38/16C22C38/08C22C38/12C22C38/44C22C38/42B22F2003/248
Inventor 包崇玺王佳峰曹红斌
Owner NBTM NEW MATERIALS GRP
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