Hot spray processing technique for alloy coating of AOF bidirectional protecting oil pump plunger

Abstract

The invention relates to a hot spray processing technique for an alloy coating of an AOF bidirectional protecting oil pump plunger. The processing technique comprises the following steps: carrying out surface oil removal treatment on an oil pump plunger blank; burnishing and roughening the blank by an abrasive band; preheating the treated blank to 300 DEG C for surface activation; then pre-spraying alloy powder with the thickness about 0.2 mm to protect the surface of the plunger from contacting air indirectly; continuously spraying till the ultimate thickness of the coating reaches 0.4 mm; heating the plunger blank by an intermediate induction heating device after spraying is completed for remelting of the alloy coating, wherein the remelting temperature is about 1,000 DEG C; and finally burnishing and polishing to prepare the AOF bidirectional protecting oil pump plunger by using No.100 and No.200 abrasive bands. The processing technique has simple and convenient operation, the coating is combined closely after spraying; the performance of a basal body of the plunger is not influenced during coating; and the thickness of the coating is more than 0.25 mm, and the coating can resist outside wearing and corrosion, and reduce the wearing to the inner surface of a pump cylinder of an oil well pump.

Description

technical field [0001] The invention relates to a thermal spraying processing technology for an alloy coating of an AOF two-way protection oil pump plunger, and belongs to the field of petroleum equipment processing. Background technique [0002] Rod pump oil production of pumping unit is an artificial lifting oil production method, which is widely used in major oil fields at home and abroad for its advantages of simple equipment, low investment, convenient management and strong adaptability. The performance of rod pump oil extraction equipment plays a decisive role in the field of oil extraction. The oil well pump is an important part of it. It is lowered into the well through the oil pipe and the sucker rod and submerged at a certain depth below the liquid surface, and the oil is discharged from the ground by pumping. The oil pump is mainly composed of pump barrel, plunger, oil inlet valve and oil outlet valve. During the upstroke, the volume of the lower pump chamber be...

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Problems solved by technology

[0005] Although the chemical plating and other coatings on the surface of the plunger of the oil well pump in the past slow down the wear of the plunger to a certain extent and improve the corrosion resistance of the plunger, due to the increase of its own surface hardness, it will inevitably cause damage to the inside of the pump barrel. Increased surface wear reduces the normal service life of the pump barrel

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