Assembly type screw drill metal stator and axial machining and assembling process thereof

Abstract

The invention discloses an assembly type screw drill metal stator and an axial machining and assembling process thereof. The assembly type screw drill metal stator comprises a sleeve, a locking jointand a plurality of equal-length stator short segments, and the plurality of stator short segments are installed in the sleeve through circumferential positioning of bolts and axial positioning of thelocking joint, so that the screw drill metal stator with the required length is formed through assembling. The method of segmented rotary splicing, two-end suspension locking, high-temperature-resistant circular sealing ring sealing, circular pipe sleeving, bolt fixing and inner screw surface chromium plating strengthening is adopted, the machining difficulty is greatly reduced, the matching precision is improved, the working performance of the all-metal screw drill is improved, and the service life of the all-metal screw drill is prolonged. The actual machining length is small by adopting a segmented equal-length machining mode, broach milling or numerical control milling machine machining is adopted, the machining precision is easy to control, the radial machining precision is higher, ametal stator with the needed length and precision can be formed only through one numerical control machining program and circular machining for multiple times for assembly and series connection, and the problem that the stator machining precision is not high enough is solved.

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 working performance and short life. The main reason is that the stator has a long processing length and the radial accuracy cannot meet the requirements, which leads to the failure of the cooperation between the stator and the rotor.

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