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Spline shaft of hydraulic pump

A spline shaft and hydraulic pump technology, which is applied in the field of hydraulic pump spline shafts, can solve the problems of low hardness and non-wear resistance, and achieve the effects of reducing oxygen content, increasing strength, and improving stability

Inactive Publication Date: 2018-03-30
NINGBO HONGBO MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of traditional alloy steel such as low hardness and non-wear resistance, Publication No. 106244936A discloses a method to improve the strength, hardness and wear resistance of the product by increasing the content of carbon, chromium and molybdenum in the alloy ball.
However, simply adding some elements cannot solve the problems of strength, hardness, toughness and corrosion resistance of alloy steel.

Method used

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  • Spline shaft of hydraulic pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Ingredients: Weigh raw materials according to the composition and mass percentage of the above hydraulic pump spline shaft, including Si: 0.5%, Mn: 0.2%, C: 0.3%, Cr: 0.4%, Al: 0.3%, Ni: 0.3%, Mo: 0.2%, Ti: 0.08%, the balance is Fe and impurities, wherein the impurities include H<0.002%, S<0.003%, N<0.004%, O<0.001%. Fe, Cr, and Ni are directly smelted into alloy liquid 1.

[0035] Deoxygenation: first add Al and Mo to the alloy liquid 1 for pre-deoxidation, then add C, Si, Mn for secondary deoxidation, then use jet mill to grind Ti into Ti powder with a particle size of 300nm, and finally add The Ti powder is finally deoxidized to form an alloy solution 2, and the alloy solution 2 is poured into an alloy steel plate.

[0036] Steel plate rolling: heat the alloy steel plate at a heating rate of 30°C / s to 1150°C, keep it warm for 100min, cool it naturally to 1050°C, and perform the first mechanical rolling. The thickness of the steel plate is reduced from 80mm to 40mm, ...

Embodiment 2

[0039]Ingredients: Weigh raw materials according to the composition and mass percentage of the above-mentioned spline shaft of the hydraulic pump, including Si: 0.4%, Mn: 0.1%, C: 0.2%, Cr: 0.3%, Al: 0.2%, Ni: 0.2%, Mo: 0.1%, Ti: 0.05%, the balance is Fe and impurities, wherein the impurities include H<0.002%, S<0.003%, N<0.004%, O<0.001%. Fe, Cr, and Ni are directly smelted into alloy liquid 1.

[0040] Deoxygenation: first add Al and Mo to the alloy liquid 1 for pre-deoxidation, then add C, Si, Mn for secondary deoxidation, then use jet mill to grind Ti into Ti powder with a particle size of 300nm, and finally add The Ti powder is finally deoxidized to form an alloy solution 2, and the alloy solution 2 is poured into an alloy steel plate.

[0041] Steel plate rolling: heat the alloy steel plate at a heating rate of 30°C / s to 1150°C, keep it warm for 100min, cool it naturally to 1050°C, and perform the first mechanical rolling. The thickness of the steel plate is reduced fro...

Embodiment 3

[0044] Ingredients: Weigh raw materials according to the composition and mass percentage of the above-mentioned spline shaft of the hydraulic pump, including Si: 0.6%, Mn: 0.3%, C: 0.4%, Cr: 0.5%, Al: 0.4%, Ni: 0.4%, Mo: 0.3%, Ti: 0.1%, the balance is Fe and impurities, wherein the impurities include H<0.002%, S<0.003%, N<0.004%, O<0.001%. Fe, Cr, and Ni are directly smelted into alloy liquid 1.

[0045] Deoxygenation: first add Al and Mo to the alloy liquid 1 for pre-deoxidation, then add C, Si, Mn for secondary deoxidation, then use jet mill to grind Ti into Ti powder with a particle size of 300nm, and finally add The Ti powder is finally deoxidized to form an alloy solution 2, and the alloy solution 2 is poured into an alloy steel plate.

[0046] Steel plate rolling: heat the alloy steel plate at a heating rate of 30°C / s to 1150°C, keep it warm for 100min, cool it naturally to 1050°C, and perform the first mechanical rolling. The thickness of the steel plate is reduced fro...

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Abstract

The invention discloses a spline shaft of a hydraulic pump, and belongs to the technical field of metal materials. The spline shaft comprises, by mass: 0.4-0.6% of Si, 0.1-0.3% of Mn, 0.2-0.4% of C, 0.3-0.5% of Cr, 0.2-0.4% of A1, 0.2-0.4% of Ni, 0.1-0.3% of Mo, 0.05-0.1% of Ti, the balance Fe and impurities. Aluminum in raw materials has a good capability of combining with oxygen and is an excellent element which is matched with other alloy elements such as manganese and the like. The aluminum can be used for refining grains, and improving the oxidation resistance and wear resistance of the steel, fatigue strength and corrosion resistance of the steel in oxidizing acid. Titanium has an active chemical activity, and is easy to react with the impurity elements H, N and O in the steel, so that the comprehensive performance of the steel is improved, and the steel has the outstanding advantages of being high in strength and low in density. Meanwhile, the oxygen content in the steel is reduced by changing the adding sequence of alloy and removing oxygen by multiple times.

Description

technical field [0001] The invention relates to a hydraulic pump spline shaft, which belongs to the field of metal materials. Background technique [0002] With the rapid development of the domestic construction machinery industry, the reliability control of construction machinery is becoming more and more stringent. In order to improve the reliability of construction machinery, the stability of the hydraulic pump, which is the core component of construction machinery, is also required to be higher and higher, and the stability of the hydraulic pump depends on the performance of the main transmission part of the hydraulic pump, the spline shaft. The processing technology of the spline in the blind hole of the main part of the hydraulic pump spline of the current construction machinery is mainly processed by gear shaping, and the processing accuracy can only reach level 7. The transmission spline has a certain gap, which is not only important for the stability of the hydrauli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50C21D8/02C21D9/28C21C7/06F04B53/00
CPCC22C38/02C21C7/0006C21C7/06C21D8/0205C21D8/0226C21D9/28C22C38/04C22C38/06C22C38/44C22C38/50F04B53/00
Inventor 施红飞王巧洪若冰夏吉显侯卫兵
Owner NINGBO HONGBO MACHINERY MFG
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