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Ion nitriding method for ultrahigh-strength stainless steel gear

An ultra-high-strength, ion nitriding technology, applied in the furnace type, coating, furnace, etc., can solve the problems of uneven nitriding layer, high cost, high alloy element content of gears, shorten the nitriding time and avoid hydrogen Crisp, work efficiency improvement effect

Pending Publication Date: 2022-01-14
BEIJING SATELLITE MFG FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For ultra-high-strength stainless steel gears, the nitriding surface strengthening has significant difficulties: 1) The content of alloy elements is high, which has obvious anti-seepage effect, and it is difficult to obtain a satisfactory thickness of the nitriding layer
2) Shielding phenomenon will occur during nitriding process, resulting in uneven nitriding layer of gears
For ultra-high-strength stainless steel gears, the real object is used as the test piece, which is costly; the test block is used as the sample, and its structure cannot represent the actual nitriding effect of the gear.

Method used

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  • Ion nitriding method for ultrahigh-strength stainless steel gear
  • Ion nitriding method for ultrahigh-strength stainless steel gear
  • Ion nitriding method for ultrahigh-strength stainless steel gear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0055] 1) Design nitriding tooling according to the size and shape of internal gear parts to protect non-nitriding parts except the teeth; make profiling tooling and test pieces.

[0056] 2) Clean the nitriding tooling and profiling tooling in step 1) with a hydrocarbon cleaning agent, and then wipe with absolute ethanol.

[0057] 3) Carry out vacuum annealing heat treatment to the nitriding tooling and profiling tooling in step 2), and the heat treatment parameters are as follows:

[0058] Furnace loading method: room temperature furnace;

[0059] Heating rate: 10°C / min;

[0060] Vacuum annealing temperature: 600°C;

[0061] Heat preservation: 2h;

[0062] Cooling: The furnace temperature is below 150°C.

[0063] 4) Use a hydrocarbon cleaning agent to wipe the outer surface of the gear parts and the position of the teeth, then wipe it with absolute ethanol, and dry it with oil-free compressed air or nitrogen;

[0064] 5) Install the gear parts in step 4) into the nitridi...

Embodiment example 2

[0071] 1) Design nitriding tooling according to the size and shape of external gear parts to protect non-nitriding parts except the teeth; make profiling tooling and test pieces.

[0072] 2) Clean the nitriding tooling and profiling tooling in step 1) with a hydrocarbon cleaning agent, and then wipe with absolute ethanol.

[0073] 3) Carry out vacuum annealing heat treatment to the nitriding tooling and profiling tooling in step 2), and the heat treatment parameters are as follows:

[0074] Furnace loading method: furnace at room temperature; heating rate: 10°C / min; vacuum annealing temperature: 600°C; heat preservation: 2h; cooling: furnace temperature below 150°C.

[0075] 4) Use a hydrocarbon cleaning agent to wipe the outer surface of the gear parts and the position of the teeth, then wipe it with absolute ethanol, and dry it with oil-free compressed air or nitrogen;

[0076] 5) Install the gear parts in step 4) into the nitriding tooling, and combine the profiling piece ...

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Abstract

The invention relates to an ion nitriding method for an ultrahigh-strength stainless steel gear. The ion nitriding method comprises the following steps that S1, a nitriding tool and a profiling tool are designed; S2, the nitriding tool and the profiling tool are cleaned by adopting a hydrocarbon cleaning agent and then wiped by using absolute ethyl alcohol; S3, vacuum annealing heat treatment is carried out on the cleaned nitriding tool and the cleaned profiling tool; S4, the outer surface of the gear part and the positions with small holes, then wiping is carried out by using the absolute ethyl alcohol, and blow drying is carried out by using oil-free compressed air or nitrogen; S5, a combined body of a test piece and the profiling tool is formed; S6, the nitriding tool and the gear part after combination is completed, and the combined body of the test piece and the profiling tool are uniformly distributed on a cathode disc of an ion nitriding furnace; S7, nitriding is carried out on the gear part and the test piece; and S8, the nitriding tool and the gear part, and the combined body of the test piece and the profiling tool are discharged out of the furnace after being cooled to 50 DEG C or below. According to the method, the process parameters can be adjusted in the nitriding process, and the requirement that a nitriding layer is evenly distributed along the tooth profile can be met.

Description

technical field [0001] The invention relates to an ion nitriding method for ultra-high-strength stainless steel gears, belonging to the technical field of chemical heat treatment. Background technique [0002] Ultra-high-strength stainless steel is currently the metal structural material with the highest tensile strength and the best comprehensive mechanical properties such as toughness. It is widely used in aviation, aerospace and other high-tech fields, and has become An irreplaceable material for main load-bearing components such as gears. The requirements for ultra-high-strength steel in gear applications mainly include ultra-high strength, high toughness and corrosion resistance, etc., to meet the needs of reducing structural weight, reducing volume, prolonging life and providing reliable use. [0003] During the working process, the gears will bear various loads of different speeds and sizes, and the mutual wear will continue to occur between the gears. Once the wear...

Claims

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Application Information

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IPC IPC(8): C23C8/38C23C8/04C21D9/32C21D1/773C21D1/26
CPCC23C8/38C23C8/04C21D1/26C21D1/773C21D9/32
Inventor 陈晓红闻强苗吕振兴刘冬伟李国利张晓刚邓肖峰白晶莹崔庆新李思振
Owner BEIJING SATELLITE MFG FACTORY
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