Way to connect with tightness details type shaft sleeve
(57) Abstract:Usage: in mechanical engineering in the creation and restoration of immovable joints type shaft sleeve. The inventive connection for the use of components with different hardness of the mating surfaces. Method of plastic deformation of the tool on the mating surfaces of the extreme hardness perform depression ellipsometry forms and projections on the perimeter of a variable height. As a tool they use established in the separator body rolling and interact with the surface of the movable element. Plastic deformation is produced by radial movement of the rolling bodies, carried out by axial movement affecting them rolling element, which may be communicated to the ultrasonic vibration, the direction of which coincides with the direction of movement. 2 C.p. f-crystals, 6 ill. The invention relates to mechanical engineering, in particular, to compounds with tightness details type shaft sleeve, and can be used in the establishment and restoration of immovable joints.A known method of connecting to the tightness of parts with different hardness. On items with solid over Ernest less solid parts 
There is a method of joining parts with different plasticity, in which the connection is formed by moving more plastic material of the same part in the groove part of the less ductile material 
A known method of connecting to the tightness of the parts, including the implementation of relief in the form of projections and depressions, and protrusions are in the form of cones, and hollows in the form of covering the base of the cones and smoothly mating with them truncated tori, the volumes are equal to the volumes of cones 
Using this connection method at the same time the tabs on the solid parts that are embedded in the surface with less hardness, and recesses that are filled by moving more plastic material, improves the reliability of connection with tension.However, the formation of protrusions and depressions on a small area of the workpiece surface with a spot diameter of not more than 2 mm reduces the advantages of this method. Small outer diameter of the depression is equal to the area of the surfaces of the projections and depressions on the spot diameter, the relatively small surface area mates occupied by relief, does not contribute to increasing the carrying capacity of the connection. Plastic material does not fill completely troop the voltage, beyond the fluidity of a plastic material, which reduces the load capacity of the connection under cyclic loads in operation of the connection.The closest in technical essence to the invention is a method of connecting to the tightness of parts like shaft sleeve including a preliminary run on the mating surface of one of the joined parts by means of plastic deformation of the tool projections with a hardness exceeding the hardness of the material other mating parts, and depressions, education Assembly gap between the joined parts, mate, and subsequent sampling of the specified gap 
During the heat treatment compounds the initial contacting of the surfaces occurs on the tops of the projections of the parts, the material which is received as a result of deformation increased physical-mechanical properties, in particular, a higher hardness than the material of another part. As a result, large contact pressure protrusions of the surface of one part deform the material of the other of the mating surfaces in the grooves between the projections. However, full implementation of the protrusions is not happening due to the fact that the grooves near the ends odniczych ledges, there is tension, beyond the fluidity of a plastic material, which reduces the amount of tension and, accordingly, the carrying capacity of the connections under cyclic loads under operational conditions.Task to be solved by the claimed invention is directed, is to increase the load capacity of the connection is covered and covering parts with tension.To solve the problem in a known manner in connection with tightness details type shaft sleeve including a preliminary run on the mating surface of one of the joined parts by means of plastic deformation of the tool projections with a hardness exceeding the hardness of the material other mating parts, and depressions, education Assembly gap between the joined parts, mate, and subsequent sampling of the specified gap for connection use parts of different hardness of the mating surfaces, as a tool for plastic deformation is used installed in the separator body rolling and interact with the surface of the rolling element, and subjected to plastic deformation of the workpiece surface pair higher hardness by radial the enta, resulting gain depression ellipsometry forms and projections on the perimeter of a variable height.As the rolling elements can be used rollers and the rolling element in its axial movement reported by the ultrasonic vibration, the direction of which coincides with the direction of movement.The invention is illustrated graphics, where Fig. 1 presents the execution scheme of relief on parts like "shaft" of Fig. 2 the execution scheme of relief on parts like "Bush", and Fig. 3, 4 and 5 relief on parts like shaft with longitudinal, transverse and angular position of the major axis of the basin relative to the axis of the piece; Fig. 6 connection with tightness and a fragment of the cross-section.When performing relief on parts like "shaft" (see Fig. 1) on the landing surface of the shaft 1 set the separator 2 with the rolling elements 3. The tool force P with the working surface 4 of the report, the axial displacement. The diameter of the working surface of the tool in contact with the rolling elements, is less than the lateral dimension defined by the sum of the two maximum diameters of the rolling elements and the diameter of the shaft. The result of the contact pressure on the body of the roller 3 in the axial movement of the tool b is ing compacted, and due to the action of shearing forces, determined by the curvature of the Seating surface and the rolling elements, is shifted to the periphery of the depressions forming the protrusions 6 a variable height along the perimeter of the cavities. The rolling elements are in the form of rollers forming a different curvature or balls. They are placed in boxes, separators, ensuring the orientation of the rolling elements and, respectively, the relative positions of the recesses of the relief, for example, in a checkerboard pattern with longitudinal (see Fig. 3), cross (see Fig. 4) or angular (see Fig. 5) location of the major axis of the cavities relative to the axis of the piece.When performing relief on parts like "Bush" (see Fig. 2) on the landing surface of the sleeve 7 set the separator 8 with the rolling bodies. The diameter of the working surface 10 of the tool in contact with the rolling bodies, more lateral dimension defined by the difference between the diameter of the mounting bore and two maximum diameters of the rolling elements. This ensures that the contact pressure on the rolling body in the event of axial movement of the tool and the formation of the desired relief on the Seating surface of the sleeve.Tools 4 and 10 during the formation of the relief you can tell ultrasonic vibrations, the effect of which is liveout for one). The waveguide is rigidly fastened to the hub of the ultrasonic transducer. The use of ultrasonic vibrations in the longitudinal movement of the tool reduces the effort on the instrument when performing plastic deformation of the shaft or sleeve rolling elements, increases the hardness of the projections due to work hardening of the material when it is offset toward the periphery of the depression.The relief on the part applied with the density at which the ratio of the total surface area occupied by the elevation to the entire Seating surface reaches of 0.35. This condition is ensured by the dimensions of the recesses with depth of deformation that does not exceed the maximum amount of tension in the connection. When the deformation of the Seating surface to a depth of tension on it are formed ellipsometry basin, and along the perimeter of the depressions are formed protrusions with a maximum height not exceeding the maximum deepening of the rolling elements.The connection tightness (see Fig. 6) carry out thermal deformation of parts. The initial contacting of connected components during thermal Assembly occurs protruding above the landing surface contours formed by the protrusions 6 a variable height according perimetry this due to the tightness at the base surfaces of the more ductile material is moved into the recess surface with greater hardness. The coupling parts on the base surfaces of added compounds on the contours of the projections and the surfaces of the cavities within these contours. When the load of the connection paths of the projections and the material in the hollows perceive shifting efforts.The increase of the contact surfaces on the projections, providing the possibility of moving the plastic material into the cavities by performing them with the necessary transverse dimensions, the filling material depressions located inside the tabs, can significantly increase the carrying capacity of connections with tightness details type shaft sleeve. 1. Way to connect with tightness details type shaft sleeve including a preliminary run on the mating surface of one of the joined parts by means of plastic deformation of the tool projections with a hardness exceeding the hardness of the material other mating parts, and depressions, education Assembly gap between the joined parts, mate, and subsequent sampling of the specified gap, characterized in that the compounds used parts with different hardness of the mating surfaces, as a tool for plastic deformation is used installed in the Finance subject item surface pair higher hardness by radial movement of the rolling bodies, implemented in the event of axial movement affecting them rolling element, resulting in a gain depression ellipsometry forms and projections on the perimeter of a variable height.2. The method according to p. 1, characterized in that the rolling bodies use the rollers.3. The method according to p. 1 or 2, characterized in that the rolling element in its axial movement reported by the ultrasonic vibration, the direction of which coincides with the direction of movement.
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