Manufacturing method for oil pump rotor

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...

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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

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