Disassembling the bearing from the shaft and the device for its implementation
(57) Abstract:Usage: Assembly work. The inventive device includes a source of electrical energy, a Converter of electrical energy into thermal energy. The Converter is implemented in the form of pairs of contacts. The source is designed as a group of separate sources connected with the contacts and made in the form of-winding step-down transformer. 2 S. and 2 C. p. F.-ly, 2 Il. The invention relates to mechanical work, in particular to methods of Dismounting of rolling bearings with the shaft journal, and can be used in the manufacture of repair work.Known disassembling the bearing, whereby heating of the movable bearing to the appropriate temperature is induction 
The disadvantage of this method is that this method due to stray fields is heated and the shaft that requires high power source and increase overheating of the bearing race.Closest to the present invention is a method of removal of the bearings from the shaft  which consists in heating the inner ring of the bearing by rotating one of the rings with remote lubrication.overhasty balls and the raceways of the rings. Additionally, the simultaneous heating of both rings requires a higher installed capacity device Dismounting of bearings.Closest to the present invention is a device consisting of a heater of the bearing and puller.The disadvantage of this device is the increased power consumption due to the fact that part of the energy is used for compensation of stray fields. In addition, this unit has high safety requirements due to the strong electromagnetic fields of high frequency.The purpose of the invention to reduce power consumption and improve safety.The objective is achieved by the fact that the heated first outer ring, and inner, and heating is carried out by the electric-contact method.In the device to implement the method that contains the electric power source and a Converter of electrical energy into heat; the Converter is implemented in the form of pairs of contacts to communicate with the sleeves of the bearings connected to the poles of a source of electrical energy. Another distinctive feature of the device is performing an energy source in the form of a group of individual sources with polyson step-down transformer, the primary winding of which is connected to the network, and the secondary winding are connected with contacts.In Fig.1 shows a diagram of the device for disassembly of the bearing from the shaft; Fig.2 is an electric wiring diagram of the source with the bearing bracket.Device for removal of the bearings from the shaft includes a source 1 of electrical energy, which may be in the form of the transformer (Fig.2), a pair of contacts inner race 2 and outer casing 3 is connected to the power wires 4, and the stripper 5. The transformer 1 has a primary winding 6 and n of the secondary winding 7 connected wires of the pairs of contacts of the clamps 2 and 3. Contacts inner race 2 is separated from the shaft by insulating spacers 8.The method is as follows.The shaft with the bearing mounted on the stripper, clamps, bearings connected pair of contact clips 2 and 3, and the outer ferrule is connected pairs of contacts, and only the first internal contacts. The energy source is connected to the network and give a time delay of about 30 for heating the upper clip, then disconnect the pins from the top of the cage 3, is connected to the second contacts to the inner holder 2 and, after a period of time, NEOU and inner race of the bearings during removal. This, in turn, by half will reduce the installed power source, and accordingly the current consumed from the network.The operation of the heating of the bearing is equal to the total heating energy of each of the rings. Since the power source is determined by dividing the work on time, with separate heating clamps the maximum power will be determined by the work to heat a large ring, divided by the heating time. Therefore, if the bearing consists of two rings, with separate heating rings of power will drop by almost two times.The proposed device increases the efficiency of removal of the bearings from the shaft by eliminating the deformation of the shaft journal and the bearing. In addition, the exclusion of induction heating reduces the risk of installation for health personnel. 1. Disassembling the bearing from the shaft, including heat, rings, characterized in that, to reduce power consumption, is first heated by the outer ring, then heat the inner ring, and heating is carried out by the electric-contact method.2. The device for disassembly of the bearing from the shaft containing a source of electrical energy, changes the user made in the form of pairs of contacts to communicate with the sleeves of the bearings, connected to the poles of a source of electrical energy.3. The device according to p. 2, characterized in that, to increase the uniformity of heating of the bearing and speed of dismantling, the energy source is designed as a group of separate sources poles associated with a separate pair of contacts each.4. The device according to p. 3, characterized in that the source made in the form of-winding step-down transformer, the primary winding of which is connected to the network, and the secondary winding are connected with contacts.
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