The method of obtaining compounds of covering and covered parts
(57) Abstract:Usage: in mechanized production upon receipt of a pressing connection details type shaft sleeve, repair and restoration of the holes in the hull details. The inventive covered in detail in the form smertnoi sleeve is made by bending into a cylinder of sheet blanks having the shape of a parallelogram. The outer diameter of the cylinder must be less than or equal to the hole covering the details. After installing smertnoi sleeve in the hole make rolling the inner surface of the sleeve raschetnym tool. In the manufacture of sheet stock in the form of a parallelogram with an acute angle equal to 45oin the process of rolling is increased density of the junction and, therefore, increase the reliability of the connection. 1 C. p. F.-ly, 3 ill. 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 the holes in the hull details.The known method for obtaining compounds of covering and covered parts, the latter of which is made in Velky in the hole covering parts and the subsequent rolling of the inner surface of the sleeve.The disadvantage of this method is the relatively low density of interface smertnoi sleeve that reduces the reliability of the connection during its operation. In addition, in this case, high accuracy is required in the manufacture of sheet blanks for smertnoi sleeve, which increases the complexity of the process.The technical problem of the invention improve the reliability of the connection cover and the covered parts due to the increase of the density of interface smertnoi sleeve while simultaneously reducing the complexity of the technological process for obtaining compounds by increasing the tolerances on the dimensions of the sheet blanks for smertnoi sleeve.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 sheet stock, the installation sleeve into the hole covering parts and the subsequent rolling of the inner surface of the sleeve, the sheet for manufacturing smertnoi sleeve carry out in the form of a parallelogram, the magnitude of the acute angle which may be 45about.In Fig. 1 shows the connection is ocess rolling joint smertnoi sleeve.The method is as follows.Covered in part 1 are in the form smertnoi sleeve from pre-manufactured sheet 2 having the shape of a parallelogram, by bending it into a cylinder with an outer diameter less than or equal to the diameter of the hole covering part 3. However due to the fact that the sheet blank 2 is not rectangular, the outer diameter of a covered part 1 may additionally be provided with longitudinal relative movement of the edges AB and CD smertnoi sleeve. This fact makes it possible to increase the tolerance for the manufacture of the size l of the sheet blanks 2 and, thereby, reduce the complexity of its manufacture. To increase the strength of connection parts 1 and 3 on the inner surface of the covering part can be executed grooves 4.Covered in item 1 is inserted into the hole of the covering part 3. Due to the forces of elasticity covered in part 1 seeks to unfold, thereby providing a press-fit it into the hole. After that make rolling the inner surface of the workpiece 1 raschetnym tool 5. Due to the fact that the line of intersection smertnoi sleeve AB is at an angle to the direction of rolling R, blithedale line of intersection of AB components of FABand FCDwhat causes longitudinal movement of the edges AB and CD relative to each other. As a result of this intensifying processes smooth the asperities on the contacting edges, which leads to an increase in the density of the joint army and to improve reliability of the connection. Longitudinal relative movement of the edges AB and CD occurs when the angle between the line of intersection of AB and the direction of rolling R = 45about. Due to the fact that the rate of longitudinal feed of the VCRRaskatov tool 5 is much less than the speed of rolling Vp, the angle having a value close to 45aboutprovides the use for the manufacture of a covered part 1, the sheet 2 having the form of a parallelogram with an acute angle equal to 45about.Improving the reliability of connection of details in this case due to the fact that the processes of smoothing of asperities on the contacting edges of the joint smertnoi bushings are more intensively. Reducing the complexity of the technological process for obtaining compounds is explained by the reduction in the complexity of the manufacturing process sheet for smertnoi sleeve. 1. The METHOD of OBTAINING compounds of COVERING AND COVERED PARTS of the five-sheet, the installation sleeve into the hole covering parts and the subsequent rolling of the inner surface of the sleeve, characterized in that the sheet for manufacturing smertnoi sleeve carry out in the form of a parallelogram.2. The method according to p. 1, characterized in that the sheet is performed in the form of a parallelogram with an acute angle, constituting 45o.
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