Powder metallurgy formulas for oil supplementing pump rotors

A powder metallurgy and oil charge pump technology, applied in pump components, rotary piston type/swing piston type pump components, mechanical equipment, etc., can solve problems such as cracking, high hardness heat treatment deformation, etc., to change the technical effect, improve Manufacturing Accuracy, Effect of Solving Deformation Problems in Soft Nitriding Heat Treatment

Pending Publication Date: 2020-12-11
SUZHOU SABO IND DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a powder metallurgy formula for the rotor of the charge pump to solve the problem of out-of-tolerance deformation and cracking of the rotor after high hardness heat treatment after cold extrusion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The powder metallurgy formula used for the rotor of the charge pump, the specific composition is as follows:

[0013] The mass fraction of the inner rotor material composition is: C is 0.3%, Ni is 0.7%, Cu is 1.2%, and the rest is Fe;

[0014] The mass fraction of the material composition of the outer rotor is: C is 0.28%, Ni is 0.7%, Mo is 0.25%, Cu is 0.8%, and the rest is Fe.

[0015] According to the material ratio of Example 1, the main design requirements and testing data of the finished inner and outer rotors obtained after pressing, sintering, cold extrusion, nitrocarburizing heat treatment, and grinding are as follows:

[0016] The verticality of the inner rotor is 0.016mm, the runout is 0.025mm, the parallelism is 0.004, and the hardness is HR15N75.1;

[0017] The verticality of the outer rotor is 0.015mm, the runout is 0.024mm, the parallelism is 0.004, and the hardness is HR15N81.3;

[0018] The detection accuracy of the finished product obtained in Exampl...

Embodiment 2

[0020] The powder metallurgy formula used for the rotor of the charge pump, the specific composition is as follows:

[0021] The mass fraction of the inner rotor material is: C is 0.5%, Ni is 2.0%, Cu is 3.5%, and the rest is Fe;

[0022] The mass fraction of the outer rotor material is: 0.4% C, 1.3% Ni, 0.38% Mo, 4.5% Cu, and the rest is Fe.

[0023] According to the material ratio of Example 2, the main design requirements and testing data of the finished product of the inner and outer rotors obtained after pressing, sintering, cold extrusion, nitrocarburizing heat treatment, and grinding are as follows:

[0024] The verticality of inner rotor No. 2 is 0.015mm, the runout is 0.032mm, the parallelism is 0.004, and the hardness is HR15N75.6;

[0025] The verticality of the No. 2 outer rotor is 0.013mm, the runout is 0.023mm, the parallelism is 0.005, and the hardness is HR15N82.2.

[0026] The detection accuracy of the finished product obtained in Example 2 meets the require...

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Abstract

The invention discloses powder metallurgy formulas for oil supplementing pump rotors. The inner rotor is prepared from, by mass, 0.3%-0.5% of C, 0.6%-2.0% of Ni, 1.0%-4.0% of Cu and the balance Fe. The outer rotor is prepared from, by mass, 0.25% to 0.5% of C, 0.6% to 1.5% of Ni, 0.2% to 0.4% of Mo, 0.6% to 5.0% of Cu and the balance of Fe. By effectively proportioning the material components, a traditional process and acquired technical effects are changed, and the problem of tufftriding heat treatment deformation after sintering and cold extrusion is solved, so that the manufacturing precision and the comprehensive mechanical property of the oil supplementing pump rotors are improved, and the service life of the oil supplementing pump rotors is prolonged.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy materials, in particular to a powder metallurgy formulation for a charge pump rotor. Background technique [0002] At present, the inner and outer rotors used in conventional charge pumps are generally produced in large quantities by powder metallurgy, and can be used as finished products after polishing. However, the working pressure of the conventional rotor charge pump is generally lower than 1.5bar, and the maximum pressure does not exceed 3bar; while the working pressure of the rotor charge pump applied to the servo variable control of the plunger pump exceeds 25bar for a long time, and the maximum pressure is 30bar. Under the action of high-pressure oil, the radial load of the inner rotor finally acts on the bearing through the drive shaft, and the radial load of the outer rotor acts on the side wall of the matching inner chamber of the charge pump housing through its outer circle....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/08C22C38/16C22C38/12B22F3/10F04C15/00
CPCB22F3/1035C22C38/08C22C38/12C22C38/16F04C15/00F04C2240/20
Inventor 张祝
Owner SUZHOU SABO IND DESIGN
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