The method of obtaining compounds of covering and covered parts
(57) Abstract:Usage: in mechanized production when receiving a press-fit connection covering and covered parts, the latter of which is made in the form smertnoi sleeve. The inventive smartnow sleeve is obtained by bending a sheet material and is installed in the hole covering the details. Then make rolling the inner surface of the sleeve for longitudinal movement Raskatov tool. When the direction of rolling at least one change to the opposite. 3 Il. The invention relates to a mechanical Assembly production, in particular the production of forging connections details type shaft sleeve, and can be used in engineering, for example, in the repair and restoration of various holes.The known method for obtaining compounds of covering and covered parts, the latter of which is made in the form smertnoi sleeve, including manufacturing smertnoi sleeve by bending a sheet material, the installation sleeve into the hole covering parts and the subsequent rolling of the inner surface of the sleeve for longitudinal movement Raskatov tool.
< which reduces the reliability of the obtained forging connections in operation.The technical problem of the invention improve the reliability of the obtained compounds.The task is solved in that in the known method for obtaining compounds of covering and covered parts, the latter of which is made in the form smertnoi sleeve, including manufacturing smertnoi sleeve by bending a sheet material, the installation sleeve into the hole covering parts and the subsequent rolling of the inner surface of the sleeve for longitudinal movement Raskatov tool in the process of rolling at least once change its direction to the opposite.In Fig. 1 shows the connection covered and covering parts before operation rolling; Fig. 2 a fragment of a joint smertnoi sleeve after rolling; Fig. 3 scheme of the process of rolling joint smertnoi sleeve.The method is as follows.Covered in detail are in the form smertnoi sleeve 1 by bending a sheet material into a cylinder with an outer diameter less than or equal to the diameter of the hole covering part 2. To increase the strength of the landing on the mating surface of the cover part 2 can be executed grooves 3. Swerdna sleeve 1 is inserted into the hole ohvv the hole. Then make rolling the inner surface smertnoi sleeve 1 raschetnym tool 4 in its longitudinal movement of PCR. When the direction of rolling R at least once to change to the opposite-R. due To the fact that the most intense plastic flow of metal in the rolling process takes place on the inner surface smertnoi sleeve 1, it is the angular deformation of the joint smertnoi sleeve at an angle to the direction of rolling R. subsequent longitudinal movement of PCRRaskatov tool 4 after changing the rolling direction R on the opposite-R angular deformity of the joint sleeve is made on the angle, resulting in a scarf joint abutting edges smertnoi sleeve ABC, preventing their relative radial displacement. When another subsequent change to the direction of rolling from-R to R is formed lock connection bcd preventing both lateral and longitudinal displacement of the edges smertnoi sleeve one relative to another. The METHOD of OBTAINING compounds of COVERING AND COVERED parts, the latter of which is made in the form smertnoi sleeve, including manufacturing smertnoi sleeve by a fold of the second surface of the sleeve for longitudinal movement Raskatov tool characterized in that in the process of rolling at least once change its direction to the opposite.
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