A method of manufacturing a drill pipe lockless design of aluminum alloy
(57) Abstract:Usage: during thermomechanical processing of metals in metallurgy. The inventive method includes molding a hollow billet, homogenization, extrusion pressing thickened outward and inward ends, heat treatment, straightening and cutting at the nominal size, and after heat treatment carried out radial compression of one end of the workpiece and the radial thrust of the other at a temperature creep component of 0.2 -0,65 from the melting temperature of the pipe material, and the voltage equal performance, with subsequent cooling in water and then wrapped around the protectors in the form of a steel conical shell with embossed carvings, the size of which corresponds to the sizes of the threads of the pipe and heat the ends of the pipe to a temperature creep. 2 C.p. f-crystals. The invention relates to the field of thermo-mechanical processing of metals and can find application in metallurgy.Closest to the proposed method to the technical essence and the achieved result is a method of manufacturing a drill pipe of aluminum alloy lockless design, including casting hollow billets, homogenization, extrusion size, tapping (Drilling pipes of aluminium alloys, M. Nedra, 1980, S. 157 159, 29 to 32.Dignity pipes manufactured according to the mentioned technologies is less damaging their intermediate columns during drilling complex multi-column designs.However, in the method of manufacturing incorporated and the lack of thread is formed of aluminum alloy, which determines the low wear resistance of the threaded connection (see S. 157, 158 prototype).The purpose of the invention increase the wear resistance of the threaded connection.This objective is achieved in that in the method of manufacturing a drill pipe lockless design of aluminum alloy, comprising molding a hollow blank pipe, homogenization, extrusion pressing thickened outwards and inwards of the ends of the workpiece, heat treatment, straightening, cutting to the nominal size, the threading, unlike the prototype, after heat treatment at the beginning of the lead radial compression of one end of the workpiece and the radial distribution of the other end at a temperature creep component 0,2 0,65 from the melting temperature of the pipe material, and the voltage equal performance, with subsequent cooling in water, and C heat the ends of the workpiece to a temperature creep.The best result in improving the wear resistance of threaded joints obtained by deformation under creep conditions at a temperature of 200oC and a voltage of 17 kg/mm2and when re-heating to 200oC.The most wear-resistant threaded connection is obtained when the protector take the size of the thread corresponding to the sizes of the threads on the ends of the workpiece.The presence of the above signs indicates the technical solutions according to the criterion of "novelty."Similar technical solutions, in which the residual strain was observed in the course of plastic deformation under creep conditions, and subsequent heating was carried out with conducting reverse creep, the authors have not detected. Based on this we can conclude about the relevance of the proposed technical solutions to the criterion of "significant differences".The proposed method allows to protect from wear during operation of the threads, made in aluminium alloy, with steel thread protectors with minimal output on the outer surface of the drill string and is not a source of wear of the intermediate columns. is Rymer. Made, including heat treatment, the workpiece drill pipe alloy D16 lockless design size h mm with an outer diameter of the thickened ends 180 mm. Spent deformation radial compression nipple end and radial thrust coupling under creep conditions at 200oC and a voltage of 17 kg/mm2with the subsequent unloading and cooling. For socket and spigot pipe end cut respectively the inner and outer locking thread 3-147 according to GOST 5286-75 with end stops at the larger base of the cone. Explosive punching made two steel protector in the form of a conical shell with embossed thread 3-147 and flange face. The wall thickness of the shells took 1.5 mm After newarchive and tightening protectors on the nipple and coupling the ends of the pipe was heated to 200oC, causing the reverse creep in aluminum alloy, which gave reliable fastening of the protectors on the threads of the nipple and coupling. Adopted by the thickness of the body of the protector 1.5 mm corresponds to the thickness of the flange end face 24 mm In the preparation of the drill string such pipe flanges tread face to the outer surface of the drill string. 24 mm is relatively small output, which structurally can be even more clever and aluminum alloy, including casting hollow billets pipe, homogenization, extrusion pressing thickened outwards and inwards of the ends of the workpiece, heat treatment, straightening, cutting to the nominal size, the threading, characterized in that, with the aim of improving the durability of the threaded connection, after heat treatment, the first lead radial compression of one end of the workpiece and the radial distribution of the other end at a temperature creep component 0,2 0,65 from the melting temperature of the pipe material, and the voltage equal performance, with subsequent cooling in water, and then wrapped around the ends of the workpiece protectors in the form of a steel conical shell with embossed carvings and heat the ends of the workpiece to a temperature creep.2. The method according to p. 1, characterized in that the deformation of the ends of the workpiece is carried out at 200oC and a voltage of 170 g/mm2and re-heating is carried out until 200oC.3. The method according to p. 1, characterized in that the protector take the size of the thread corresponding to the sizes of the threads on the ends of the workpiece.
FIELD: machine engineering, possibly manufacture of sealing envelopes of corrosion resistant steels of metal-plastic high-pressure bottles.
SUBSTANCE: method comprises steps of separately making metallic convex bottoms with cylindrical collar and backing ring. Thermal expansion factor of backing ring exceeds that of bottoms; outer diameter of backing ring provides close fit of bottoms onto it at 20°C; cooling preliminarily assembled backing ring with bottoms until cryogenic temperature; sliding bottoms on backing ring in cooled state until mutual touch of cylindrical collars of bottoms; heating assembly up to 20°C in order to provide close fit of backing ring in cylindrical collars of bottoms; welding bottoms along butt of assembly and then removing backing ring by chemical milling.
EFFECT: simplified process of making envelopes with enhanced mass characteristics.
2 cl, 4 dwg, 1 ex
FIELD: machine engineering, namely equipment for dismounting press-fit joints, possibly restoration of electric machines.
SUBSTANCE: apparatus includes housing with platforms for horizontal and vertical motions. Part to be dismounted is placed on horizontal motion platform and it is fed to stripping mechanism. The last is joined with vertical motion platform by means of fastening members and it is provided with adjusted grips supporting heating members with possibility of their axial movement. Heating members are in the form of nozzles for alternating feed of hot and cooled air.
EFFECT: reduced axial errors between dismounted part and stripping mechanism, lowered efforts for stripping parts.
5 cl, 5 dwg
FIELD: machine engineering, possibly restoration of articles operating at large cyclical loads and high temperature values.
SUBSTANCE: method comprises steps of cooling male part in liquefied nitrogen and introducing it into female part. Male part is made of refractory nickel alloy similar to that of female part. After equalizing temperature of assembly, it is heated till recrystallization temperature and subjected to isothermic soaking. It causes creation of structural and phase conversions in assembled parts.
EFFECT: improved quality of joints of parts.
1 ex, 1 tbl
FIELD: mechanical engineering.
SUBSTANCE: invention can be used in shaft-bushing interference. According to invention, shaft and bushing are made of material with similar physical and mechanical properties with projections in form of laser hardened paths. Pitch of parts is twice as great as their width. Paths are arranged at angle of 0-90° to axis of joint. Opposite paths of shaft and bushing are displaced relative to each other by width of part. In particular cases, paths can be arranged along ring lines lying in planes square to axis of joint, in starting lines parallel to axis of joint, or helical lines.
EFFECT: increased load-carrying capacity of joint.
4 cl, 4 dwg
FIELD: measuring technique.
SUBSTANCE: device comprises flexible measuring member mounted concentrically with respect to the bearing race and having strain gauges covered with casing and set on its surface. The device also has split bushing with conical outer side mounted for permitting cooperation of the inner side of the flexible member with the outer side of the bearing race to be tested. The flexible member is sectional and composed of two step thick-walled races provided with strain gauges, mounted on the bushing, and interconnected by means of a thread joint. The bushing has ring cylindrical recess centered in its outer surface. The inner surfaces of the smaller steps of the thick-walled races are conical, with cone bases arranged from the side of the large steps.
EFFECT: enhanced convenience of testing and reduced metal consumption.
FIELD: plastic working of metals, namely processes for forming butt welded seams on tubes at making tube studs of U-shaped tube bundles using effect of localized hot plastic deforming of welded seam and near-seam zones.
SUBSTANCE: method comprises steps of preliminarily working tube ends by expanding them from cylinder to cylinder; assembling tubes with use of mandrel and placing intermediate member of additive material between joined end surfaces of end portions of tubes sized by expansion and end surfaces of step ring. Welded seams are formed by argon-arc welding due to melting material of intermediate member at its both sides adjacent to tube ends. The intermediate member is heated up and it is subjected to hot radial squeezing while concentrating its initial deformation in surface layers according to position of ring steps, welded seams and near-seam zones on mandrel for providing size of their outer diameter equal to initial outer diameter of tubes.
EFFECT: improved quality of welded seams.
FIELD: railway transport; repair of rolling stock.
SUBSTANCE: invention relates to repair of load-bearing parts of vehicles, particularly, to repair of overspring beams of car bogies with inserts press-fitted into step bearings. According to proposed method, step bearing of overspring beam is heated, together with insert, to temperature exceeding 250°C. Inner surfaces of insert are cooled by blowing at velocity 1.1 times higher than velocity of heat exchange through surfaces in contact with step bearing to eliminate negative allowance between insert and outer bead of step bearing. To extract insert, it is expanded from inside by applying force. Device for implementing the method has body in form of disk to be arranged in step bearing with slots on side surface in which bellcranks 9 are fitted being driven by pneumatic cylinder, with claws for gripping the insert, central hole through which rod 16 of pneumatic cylinder passes to extract insert 40, with inner space designed for distribution of cooling compressed air among nozzles pointed to surfaces of insert.
EFFECT: increased efficiency when repair overspring beams, reduced energy consumption and labor input in process of repair.
3 cl, 4 dwg
FIELD: processes and apparatuses for assembling parts at tightness, possibly production and restoration of sleeves of sealing unit of turbo-compressor.
SUBSTANCE: method comprises steps of placing sleeve into embracing part at technological tightness; performing electric-contact heating of inner surface of sleeve and then deforming it by drifting for creating mounting tightness of sleeve and embracing part joint; smoothing roughness of inner surface of sleeve. Electric-contact heating and drifting of inner surface of sleeve are realized with use of duplex tool in the form of contact- heating tool and arranged behind it deforming- calibrating tool. Contact-heating tool provides heating of inner surface of sleeve in annular zone of contact with said contact-heating tool. Deforming- calibrating tool is mounted at tightness equal to 0.8 mm. In the result during one operation sleeve is pressed-in to embracing part, roughness of inner surface of sleeve is smoothed and inner surface of sleeve is strengthened at hardness 48 - 54 HRC3.
EFFECT: enhanced efficiency of assembling parts.
FIELD: machine building.
SUBSTANCE: invention is related to machine building and instrument making, and may be used in performance of machine assembly works. Method for interference fit of parts by means of press fitting with application of material that strengthens the joint includes partial press fitting of parts with measurement of press fitting force and their further additional press fitting. According to method partial press fitting of parts is carried out. Then material that strengthens joint is applied on free sections of joined surfaces of one or both parts. After that their further additional press fitting is realised.
EFFECT: simplification of assembly process and reduction of costs for joint strengthening.
FIELD: process engineering.
SUBSTANCE: external part inner surface is furnished with 2 to 5 mm-pitch teeth. Assembly is carried out to make a clearance between external and internal parts. Internal part is subjected to upsetting.
EFFECT: higher quality and strength of joint, simplified assembly.
4 dwg, 1 ex