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Method of manufacturing shaft forging and shaft forging produced by method

A technology for forgings and forging blanks, applied in the field of a method and shaft forgings prepared therefrom, can solve the problems of narrow hardenability band, qualified grain size and grain size durability, complex forging process and heat treatment process steps , low heat treatment efficiency and other problems, to achieve the effect of reducing energy consumption, high industrial application value, and improving production efficiency

Active Publication Date: 2020-05-15
WUXI BAOLU FORGING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN109457118A discloses a method for alleviating white spots in 10Ni3MnCuAl steel. By starting from the selection of electroslag remelting slag material, the formula of slag material is determined, and in combination with the baking means of smelting slag material, a high-purity graphite crucible is selected to The slag is baked in advance, and the hydrogen brought by the gas inhalation during the storage of the slag is reacted with the graphite, so that the hydrogen in the slag can be well removed in advance, thereby alleviating the white spots of 10Ni3MnCuAl steel to a certain extent phenomenon, but this method not only has a high dependence on raw materials and equipment, but also introduces a baking step, which consumes a lot of energy
[0004] CN105543644A discloses a gear steel SCM822H manufacturing process, which also solves the problem of white spots in forgings by controlling the chemical composition. It needs to use a furnace for annealing and tempering, high energy consumption, and low heat treatment efficiency
[0015] However, this method requires a large gas-fired heating furnace, which not only has high processing costs, but also has low production efficiency
[0016] CN102424934A discloses a narrow range of chemical elements C, Mn, Nb, Al and N that have a significant impact on steel hardenability and grain size to achieve a narrow hardenability zone and qualified grain size and grain size. The dual purpose of particle size durability solves the problem of white spot defects in 18CrNiMo7-6 steel, but this method needs to strictly control the composition of raw materials and ingredients, which is relatively restrictive and the forging process and heat treatment process steps are complicated, so it is difficult to popularize and use

Method used

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  • Method of manufacturing shaft forging and shaft forging produced by method
  • Method of manufacturing shaft forging and shaft forging produced by method
  • Method of manufacturing shaft forging and shaft forging produced by method

Examples

Experimental program
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Effect test

Embodiment 1

[0078] This embodiment provides a method for manufacturing a shaft forging, the method includes the following steps:

[0079] (1) The first fire forging: heat the 18CrNiMo7-6 steel ingot to 1200°C and keep it warm for 5 hours; after the heat preservation is over, carry out the first elongation of the steel ingot in turn, with a draw ratio of 2.0, and perform the first upsetting, The upsetting ratio is 2.2, and the second drawing is carried out, the drawing ratio is 2.2, and the final forging temperature is 860°C;

[0080] (2) Second fire forging: heat the forging after the first fire forging to 1240°C again, and keep it warm for 6 hours; The third elongation, the elongation ratio is 2.2, the final forging temperature is 860°C, and a forged billet with a diameter of 420mm is obtained;

[0081] (3) Heat treatment: After the forging billet is air-cooled until the surface temperature of the forging billet is 320°C, the forging billet is buried in sand at 80°C and the sand is cool...

Embodiment 2

[0084] This embodiment provides a method for manufacturing a shaft forging, the method includes the following steps:

[0085] (1) First fire forging: heat the 18CrNiMo7-6 steel ingot to 1240°C and keep it warm for 6 hours; after the heat preservation is over, carry out the first drawing and elongation of the steel ingot in sequence, the drawing ratio is 2.2, and perform the first upsetting, The upsetting ratio is 2.3, and the second drawing is carried out, the drawing ratio is 2.3, and the final forging temperature is 890°C;

[0086] (2) The second fire forging: reheat the forging after the first fire forging to 1240°C, and keep it warm for 4 hours; The third elongation, the elongation ratio is 2.3, the final forging temperature is 880°C, and a forging billet with a diameter of 460mm is obtained;

[0087] (3) Heat treatment: After the forging billet is air-cooled until the surface temperature of the forging billet is 330°C, the forging billet is buried in sand at 120°C and th...

Embodiment 3

[0089] This embodiment provides a method for manufacturing a shaft forging, the method includes the following steps:

[0090] (1) First fire forging: heat the 18CrNiMo7-6 steel ingot to 1240°C and keep it warm for 6 hours; after the heat preservation is over, carry out the first drawing and elongation of the steel ingot in sequence, the drawing ratio is 2.2, and perform the first upsetting, The upsetting ratio is 2.3, and the second drawing is carried out, the drawing ratio is 2.3, and the final forging temperature is 880°C;

[0091] (2) Second fire forging: reheat the forging after the first fire forging to 1200°C and keep it warm for 6 hours; The third elongation, the elongation ratio is 2.3, the final forging temperature is 875°C, and a forging billet with a diameter of 500mm is obtained;

[0092] (3) Heat treatment: After the forging billet is air-cooled until the surface temperature of the forging billet is 370°C, the forging billet is buried in sand at 140°C and the sand ...

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Abstract

The invention provides a method of manufacturing a shaft forging. According to the method, by strictly controlling the number, sequence, drawing ratio and upsetting ratio of drawing and upsetting in the forging process and adopting a heat treatment process of air cooling and sand cooling instead of a conventional undulation isothermal slow cooling process, the internal stress diffusion is facilitated, deformation is not easily caused, and the hydrogen amplification effect can be achieved. The shaft forging without the white point defect can be prepared without a large gas heating furnace, so that the production cost and the energy consumption are reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of metal material forging, in particular to a method for manufacturing a shaft forging and a shaft forging made therefrom. Background technique [0002] White spots are cracks formed by hydrogen in steel under the action of post-forging stress, and white spots are harmful defects to products. When white spots are found in the product, the products produced by the raw materials of the same smelting furnace number will be scrapped, especially for steels with high white spot tendency such as carbon-manganese steel and alloy steel with low carbon content, white spots are very easy to appear. [0003] CN109457118A discloses a method for alleviating white spots in 10Ni3MnCuAl steel. By starting from the selection of electroslag remelting slag material, the formula of slag material is determined, and in combination with the baking means of smelting slag material, a high-purity graphite crucible is selected to The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/13C21D8/00C21D9/28
CPCC21D7/13C21D8/005C21D9/28
Inventor 华志伟
Owner WUXI BAOLU FORGING
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