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A method for manufacturing iron-based powder metallurgy parts

An iron-based powder metallurgy and manufacturing method technology, applied in the field of powder metallurgy, can solve the problems of difficulty in increasing density or/and surface density, failing to improve mechanical properties and strength, low production efficiency, etc. / and the effect of local density, low cost, and improved mechanical properties

Active Publication Date: 2020-12-22
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It proposes to use annealing to improve the structure and reduce the hardness, but for products with high carbon content, the reduction in hardness by annealing is limited, and the annealing time is too long, resulting in low production efficiency
[0008] Therefore, for high-carbon iron-based powder metallurgy parts, it is difficult to increase the density or / and surface density through extrusion, shaping, re-pressing, surface rolling, and transverse rolling, and the mechanical properties and strength cannot be improved. the goal of

Method used

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  • A method for manufacturing iron-based powder metallurgy parts
  • A method for manufacturing iron-based powder metallurgy parts
  • A method for manufacturing iron-based powder metallurgy parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Get the raw material ready, and its proportioning is (mass percentage): 0.85% molybdenum-containing iron-molybdenum alloy powder is 98.85%; Carbon is 0.65%, and the lubricant that content is 0.5%; Above-mentioned mixed powder is pressed under the pressure of 600MPa to be Density 7.10g / cm 3 the gear blank;

[0038] Sintering: Sintering is carried out in nitrogen containing 3vol% hydrogen, the sintering temperature is 1120°C, and the sintering time is 30 minutes;

[0039] Induction heating: place the sintered gear in the induction coil for induction heating, the power frequency is 120kHZ, the heating time is 1.8S, the surface temperature is measured by infrared radiation at 950°C, and the heating depth at the tooth root is 2.0mm;

[0040] Densification: transfer the workpiece to the surface rolling equipment for surface rolling and densification, after densification, cool to room temperature, measure the depth of the densification layer, the depth is 0.4mm;

[0041] Quenc...

Embodiment 2

[0047] Get the raw material ready, and its proportioning is (mass percentage): 0.85% molybdenum-containing iron-molybdenum alloy powder is 98.85%; Carbon is 0.65%, and the lubricant that content is 0.5%; Above-mentioned mixed powder is pressed under the pressure of 600MPa to be Density 7.10g / cm 3 The green body of the gear, the outer diameter of the green body is 80mm, and the inner diameter is 40mm;

[0048] Sintering: Sintering is carried out in nitrogen containing 3vol% hydrogen, the sintering temperature is 1250°C, and the sintering time is 30 minutes;

[0049] Induction heating: place the sintered gear in the induction coil for induction heating, the power frequency is 25kHZ, the heating time is 15S, and the temperature of the part is measured by infrared radiation at 980°C;

[0050] Densification: transfer the workpiece to a recompression press for recompression densification, and cool to room temperature after densification;

[0051] Quenching and Tempering: The part ...

Embodiment 3

[0054] Get the raw materials ready, and its proportioning ratio is: iron alloy powder (chromium is 3.0%, molybdenum is 0.5%, other unavoidable substances are less than 1%, iron is the balance) is 50%, pure iron powder is 48.7%; carbon is 0.8 %, then add a lubricant with a content of 0.5%; press the above mixed powder under a pressure of 700MPa to a density of 7.2g / cm 3 The cam blank;

[0055] Sintering: Sintering is carried out in nitrogen containing 3vol% hydrogen, the sintering temperature is 1250°C, and the sintering time is 30 minutes;

[0056] Induction heating: Place the sintered cam in the induction coil for induction heating, the power frequency is 20kHZ, the heating time is 17S, and the surface temperature is measured by infrared radiation at 980°C;

[0057] Densification: transfer the workpiece to the extrusion densification equipment for extrusion densification, after densification, cool to room temperature, measure the depth of the densification layer, the depth i...

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Abstract

The invention relates to a manufacturing method of an iron-based powder metallurgy part. The manufacturing method comprises the following steps of designing materials, mixing materials, forming, sintering, induction heating, densification, quenching and tempering. According to the manufacturing method of the iron-based powder metallurgy part, hot-state densification is performed immediately afterinduction heating is adopted, the compactness is small, the efficiency is high, the thickness of the compact layer is large, compared with a traditional powder metallurgy process, the preparation method disclosed by the invention is relatively low in cost and relatively high in efficiency, the density of the prepared product is higher, the overall density can exceed 7.60g / cm3, close to the level of the powder forging, the relative density of the surface can reach 99% or above, the surface densification is basically realized, the overall density or / and the local density of the high-carbon powder metallurgy product is greatly improved, and the mechanical property of the part is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a method for manufacturing iron-based powder metallurgy parts. Background technique [0002] Powder metallurgy is an efficient process for producing gears of high strength and complex shapes. At present, through the use of high-performance powders, forming, sintering and special post-processing, powder metallurgy processes can already produce materials with densities exceeding 7.4g / cm 3 parts. Recompression and refiring technology can greatly increase the density of products. Using ordinary atomized iron powder after forming and sintering, the density of iron-based powder metallurgy parts can only reach 7.1g / cm 3 about. In order to further increase the density of powder metallurgy parts, the recompression and refiring process of forming-pre-sintering-recompression-secondary sintering can be used. Pre-sintering serves two purposes. First, anneal the powder that has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/02C22C38/42C22C38/44C22C38/58C22C38/04B22F3/10B22F3/24C21D1/18
CPCB22F3/02B22F3/10B22F3/24B22F2003/248C21D1/18C22C38/04C22C38/42C22C38/44C22C38/58
Inventor 包崇玺朱承旭冯伟立
Owner NBTM NEW MATERIALS GRP