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Hydraulic pump spline shaft

A spline shaft and hydraulic pump technology, applied in the field of alloy steel materials, can solve the problems of hydraulic system transmission stability, affecting service life, and speeding up parts, so as to improve the interface bonding method, increase the interface bonding strength, and increase the tensile strength. The effect of degree and elongation

Inactive Publication Date: 2018-05-04
NINGBO HONGBO MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 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 hydraulic system transmission It has an impact, and the existence of the gap will accelerate the wear of the parts and affect the service life

Method used

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  • Hydraulic pump spline shaft
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Press molding: Weigh alloy steel raw materials, ball mill them into powder, and then press them with flake graphite, paraffin, and zinc stearate; wherein, the alloy steel specifically includes the following components by mass percentage: C: 0.99%, Si: 0.26 %, Mn: 0.34%, Cr: 1.8%, Ni: 0.23%, Mo: 0.34%, Nb: 0.65%, and the balance is Fe; the addition of the flake graphite is 0.4% of the quality of the alloy steel raw material, so The add-on of paraffin wax is 0.8% of alloy steel raw material quality, the add-on of described zinc stearate is 0.65% of alloy steel raw material quality; The pressure of compression molding is 625Mpa;

[0029] Pre-firing and cooling: pre-fired at 900°C for 30 minutes in a hydrogen atmosphere, and water-cooled to obtain a pre-fired billet;

[0030] Recompression: Recompress the calcined body and the reinforced phase preform at 725MPa; wherein, the reinforced phase preform is made of TiO 2 Powder, Al 2 o 3 Particles and water glass are prepared ...

Embodiment 2

[0034] Compression molding: Weigh alloy steel raw materials, ball mill them into powder, and then press them with flake graphite, paraffin, and zinc stearate; wherein, the alloy steel specifically includes the following components by mass percentage: C: 1.05%, Si: 0.28 %, Mn: 0.35%, Cr: 1.9%, Ni: 0.25%, Mo: 0.36%, Nb: 0.68%, and the balance is Fe; the addition of the flake graphite is 0.41% of the quality of the alloy steel raw material, so The add-on of paraffin wax is 0.81% of alloy steel raw material quality, the add-on of described zinc stearate is 0.66% of alloy steel raw material quality; The pressure of compression molding is 628Mpa;

[0035] Pre-fired cooling: pre-fired at 908°C for 31 minutes in a hydrogen atmosphere, then water-cooled to obtain a pre-fired billet;

[0036] Recompression: Recompress the calcined body and the reinforced phase preform at 727MPa; wherein, the reinforced phase preform is made of TiO 2 Powder, Al 2 o 3 Particles and water glass are prep...

Embodiment 3

[0040] Compression molding: Weigh alloy steel raw materials, ball mill them into powder, and then press them with flake graphite, paraffin, and zinc stearate; wherein, the alloy steel specifically includes the following components by mass percentage: C: 1.1%, Si: 0.29 %, Mn: 0.36%, Cr: 1.95%, Ni: 0.28%, Mo: 0.38%, Nb: 0.72%, and the balance is Fe; the addition of the flake graphite is 0.43% of the alloy steel raw material quality, so The add-on of paraffin wax is 0.82% of alloy steel raw material quality, the add-on of described zinc stearate is 0.68% of alloy steel raw material quality; The pressure of compression molding is 631Mpa;

[0041] Pre-firing and cooling: pre-fired at 913°C for 32 minutes in a hydrogen atmosphere, and water-cooled to obtain a pre-fired billet;

[0042] Recompression: Recompress the calcined body and the reinforced phase preform at 730MPa; wherein, the reinforced phase preform is made of TiO 2 Powder, Al 2 o 3 Particles and water glass are prepare...

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Abstract

The invention relates to a spline shaft, and concretely relates to a hydraulic pump spline shaft, which belongs to the field of alloy steel materials. The hydraulic pump spline shaft is made of alloysteel; the alloy steel is concretely prepared from the following components in percentage by mass: 0.99 to 1.21 percent of C, 0.26 to 0.32 percent of Si, 0.34 to 0.39 percent of Mn, 1.8 to 2.1 percentof Cr, 0.23 to 0.34 percent of Ni, 0.34 to 0.42 percent of Mo, 0.65 to 0.80 percent of Nb, and the balance Fe; and a zinc coating and a gallate-H2TiF6 coating are sequentially coated on a surface ofthe alloy steel. According to the hydraulic pump spline shaft provided by the invention, the hydraulic pump spline shaft is prepared by adopting a repressing and resintering method, so that the porosity of the alloy steel can be reduced, the stretching degree and the elongation of the alloy steel are improved, the shape of a pore can be changed, the deformation of the alloy steel during a stretching process is more uniform, and the stress concentration can be reduced.

Description

field of invention [0001] The invention relates to a spline shaft, in particular to a hydraulic pump spline shaft, belonging to the field of alloy steel 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 accuracy of the spline shaft, the main transmission part of the hydraulic pump. [0003] 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48B22F3/16B22F3/24B22F3/10B05D7/14B05D7/24C23C30/00
CPCC22C38/02C22C38/04C22C38/44C22C38/48C23C30/00B05D7/14B05D7/24B22F3/1007B22F3/16B22F3/24B22F2003/242B22F2998/10B22F1/10
Inventor 施红飞王巧洪若冰夏吉显侯卫兵
Owner NINGBO HONGBO MACHINERY MFG
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