Sleeving splicing type full-metal screw stator and machining method thereof

Abstract

The invention discloses a sleeving splicing type full-metal screw stator and a machining method thereof. According to the stator, a half-cylinder metal stator blank with the length being two stator leads is cut and machined to form an inner helix and then cut into two half-cylinder spliced parts, after the planes of the two half-cylinder spliced parts fit each other, soldering tin is pressed intoa matching gap for welding, and finally a cylindrical metal stator inner core is formed; male thread lines with the same rotating direction are milled at the two ends of the stator inner core, and then the stator inner core is inserted into a metal pipe fitting; female thread lines are milled at the positions, corresponding to the stator inner core, of the inner walls of the two ends of the metalpipe fitting, and the stator inner core is fixed in the metal pipe fitting through a thread meshed with the metal pipe fitting. The machining method adopts thread locking fixing and metal stator splitmachining, the inner helix surface of the stator is machined more conveniently and accurately, in this way, the machining difficulty of the stator can be lowered greatly, matching precision is improved, then the working performance of the full-metal screw drilling tool is improved, and the service life of the full-metal screw drilling tool is prolonged.

Description

technical field [0001] The invention relates to the field of stator processing, in particular to a suitably spliced ​​all-metal screw stator and a processing method thereof. Background technique [0002] At present, screw drilling tools are generally rubber stators and metal rotors, and an interference fit is used between the two, but this conventional screw drilling tool can only be used in the downhole environment of 180°C and below. When drilling into high-temperature formations, the rubber stator will age, deform, or even carbonize, which will lead to the failure of the cooperation between the stator and the rotor, making the screw drilling tool that works on the principle of static pressure volumetric type unable to work normally. [0003] The all-metal screw drilling tool adopts a metal stator and a metal rotor, and there is a clearance fit between the two. Because the stator is an inner helical surface structure, the machining accuracy determines the working performan...

AI Technical Summary

Problems solved by technology

At present, screw stators at home and abroad mostly use methods such as internal broach forming of round rods, electrolytic corrosion processing, and external pressure forming of thin-walled stator sleeves. Metal screw drilling tools have low performance and short life

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