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Manufacturing method for oil pump rotor

A technology of oil pump rotor and manufacturing method, which is applied in the direction of pump components, mechanical equipment, machines/engines, etc., and can solve the problem of affecting the service life of the internal and external rotor matching clearance of the oil pump, affecting product consistency and precision, and being unable to apply high-end oil pumps, etc. problem, to achieve the effect of improving assembly efficiency, improving precision, and good compression performance

Active Publication Date: 2016-11-16
合肥波林新材料股份有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Cycloidal rotors are widely used in oil lubrication pumps for machine tools, automobiles and other mechanical and electrical products. The existing cycloidal rotors usually use steel as raw material, and the cycloids, center distance and drive keys are processed by wire cutting or milling. The disadvantages are : The processing procedure is cumbersome, requires high-precision machining equipment, and the production efficiency is low, the material utilization rate is low, the processing accuracy is low, the manufacturing cost is high, and mass production requires frequent replacement of fixtures and tools, which affects product consistency and accuracy. , especially for the cycloidal profile of the rotor
Although existing powder metallurgy methods can also prepare cycloidal rotors, their precision and strength are generally low. For example, JB / T8413.3-2008 requires a density of 6.4g / cm 3 , apparent hardness HBW60-120, tooth profile surface accuracy Ra1.6, JB / T7379-94 requirements, tooth profile surface accuracy Ra is only 3.2; the accuracy and consistency of the rotor will affect the fit clearance of the inner and outer rotors and the oil pump Service life; cannot be applied to high-end oil pumps, such as the oil pumps of Parker Hannifin in the United States

Method used

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  • Manufacturing method for oil pump rotor
  • Manufacturing method for oil pump rotor

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Embodiment

[0024] A method for manufacturing a high-density cycloidal rotor, comprising the following steps:

[0025] (1) Mixing: Weigh raw materials by weight percentage, 0-3.5% copper powder, 0.5-1.1% graphite, 0.05-0.10% spindle oil, 0.4-1.1% zinc stearate, and the balance is iron-based Alloy powder; put into a mixer and mix evenly, then take out to obtain mixed powder; the iron-based alloy powder contains 1.0-2.0% nickel, 0.4-1.2% molybdenum, and the rest is iron;

[0026] (2) Press the compact: Install the rotor pressing mold on the press, fill the mold cavity with mixed powder, press the inner and outer rotor compacts, and the compact density is 7.05-7.15g / cm 3 ;

[0027] (3) Pre-burning: place the compacted compact in a protective atmosphere, and pre-fire it at a temperature of 650-800°C for 30-50 minutes to form a pre-burned blank;

[0028] (4) Recompression: Install the rotor recompression mold on the press, put the pre-burned blank into the mold cavity, repress the pre-burned...

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Abstract

The invention discloses a manufacturing method for an oil pump rotor, and belongs to the technical field of oil pump parts. The manufacturing method includes the steps of mixing, blank pressing, pre-combusting, re-pressing, sintering, shaping, tempering, secondary shaping and heat treating, and finally finished products with the final density greater than or equal to 7.2 g / cm<3> and the rigidity greater than or equal to HRC40 can be obtained. According to the manufacturing method, the cycloidal rotor is produced through the powder metallurgy pressing method, mass production can be realized, the production efficiency is high, the product stability is good, and the material utilization rate is high. The density of the produced cycloidal rotor can reach 7.2 g / cm<3> which cannot be realized through common powder metallurgy methods; the product rigidity can reach HRC40 or above after quenching, the abrasion resistance is good, and the service life is greatly prolonged; and the material utilization rate is increased, the machining difficulty is lowered, the production efficiency is improved, and the product stability is improved.

Description

technical field [0001] The invention relates to the technical field of oil pump components, in particular to a method for manufacturing an oil pump rotor. Background technique [0002] Cycloidal rotors are widely used in oil lubrication pumps for machine tools, automobiles and other mechanical and electrical products. The existing cycloidal rotors usually use steel as raw material, and the cycloids, center distance and drive keys are processed by wire cutting or milling. The disadvantages are : The processing procedure is cumbersome, requires high-precision machining equipment, and the production efficiency is low, the material utilization rate is low, the processing accuracy is low, the manufacturing cost is high, and mass production requires frequent replacement of fixtures and tools, which affects product consistency and accuracy. , especially for the cycloidal profile of the rotor. Although existing powder metallurgy methods can also prepare cycloidal rotors, their prec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/16B22F3/24B22F5/00F04C29/00
CPCB22F1/0003B22F3/16B22F3/168B22F3/24B22F5/00B22F2003/248F04C29/00F04C2240/20
Inventor 汤浩张东李其龙张俊杰孙本松吴亚民
Owner 合肥波林新材料股份有限公司
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