The method of fixing corroded defects of metal surfaces
(57) Abstract:The invention relates to the field of engineering, namely, the sealing corroded defects metal, used especially in tightly closed habitable compartments in the composition of the spacecraft (CLA), and can also be used successfully in the oil and gas industry, agriculture, utilities and other industries. The method of fixing corroded defects of metal surfaces is that the metal surface is sanded, and the area of the defect causing the material preventing the development of corrosion, cleaning the surface of perform around the area of the defect, and the quality of the material, preventing the development of corrosion, apply low viscosity anaerobic sealant and metallopolymer Germeter-1, while after cleaning the surface around the area of the defect, corroded surface in the defect zone is impregnated with low viscosity anaerobic sealant, and after curing the impregnated surface with overlapping sealed by a continuous layer of metallopolymer Germeter-1 and after a time his vitality put the second splosh the Denia. The method is highly reliable elimination of corrosion damage and can be used inside the habitable compartments of KLAH. This prevents the spread of corrosion corroded zone significantly increases the reliability and operating life of KLAH. The present invention relates to the field of engineering, namely, the sealing corroded defects metal, used especially in tightly closed habitable compartments in the composition of the spacecraft (CLA) can also be successfully used in the oil and gas industry, agriculture, utilities and other industries.The relevance of developing a method of fixing corroded defects of the metal is determined by the need to prevent further corrosion damaged areas especially in conditions of high temperature and humidity, which is extremely important, for example, the repair of covering the spacecraft and associated with the extension of the resource efficiency of products, value economic value and security of the crew KLAH.OBRAZOVATEL rust, containing phosphoric acid (see "Primer - modifier rust EP-0199. TL6-10-2084-860).The disadvantage of this method is the inadmissibility of the acid treatment, for example, plating of ships and the inability to implement mandatory water rinse treated surfaces in zero gravity.A prototype of the chosen method of protection of the surfaces of the parts from corrosion, which consists in applying to the damaged surface coatings. This method is widely known and described in the literature, in particular in the EAST 92-1481-79 "Coating paint for metal surfaces".However, elimination of corrosion damage, such as in the skin KLAH, this way is unacceptable, as it requires a mandatory cleaning corroded surfaces from corrosion products, which may lead to a decrease in the thickness of a thin (3 mm) plating up to its destruction and depressurization of the object.The task of the invention is to develop a method of sealing corrosion damage to metal surfaces, with the reliability that does not require pre-Stripping of the damaged zone of corrosion products, not leading the natural enemy to prolong the life of products, in particular KLAH, to increase the reliability of the method of fixing corroded defects and significantly increase the safety of the crew stay on Board.The method of fixing corroded defects of metal surfaces is that the metal surface is sanded, and the area of the defect causing the material preventing the development of corrosion, unlike the prototype, the sweep surface carry around the area of the defect, and the quality of the material, preventing the development of corrosion, apply low viscosity anaerobic sealant and metallopolymer Germeter-1, while after cleaning the surface around the area of the defect, corroded surface in the defect zone is impregnated with low viscosity anaerobic sealant, and after curing the impregnated surface with overlapping sealed by a continuous layer of metallopolymer Germeter-1, and after a time his vitality put the second continuous layer of metallopolymer Germeter-1 overlapping the first, and then produce the extract prior to final curing.When the process is complete impregnation anaerobic sealant loose layer of corrosion products, ensuring the filling of the Germa who eat corrosion products.While in the outer surface microlayer defective zone anaerobic sealant remains uncured due to direct contact with oxygen, which is the inhibitor of its polymerization and curing respectively. In this case, dauvergne anaerobic sealant in the outer microlayer corroded volume is provided after application and curing metallopolymer Germeter-1, forming a dense glued airtight layer on the outer surface of the defective zone, preventing the penetration of air and moisture in the corroded layer.The technical result of the proposed method of fixing corroded surfaces is to increase its reliability, security and preservation of operational properties closed up surfaces, which eliminates the possibility of damage to the surfaces, including the linings of the product.This method completely eliminates the contents of the initiators of corrosion: air and moisture in the volume of corrosion products and prevents the flow of air and moisture in the corroded area.The proposed method is as follows.Around the area of corrosion defect on the Sam is blenny from a material softer, than the metal of the damaged structure, and then produce defatting of the defective area and the adjacent bare surface, followed by drying to remove the solvent. Next, the area of the defect-containing corrosion products, and the surrounding cleared area impregnated with low viscosity anaerobic sealant type Anyterm-1U for OST 92-1005-84. After about 2 hours nepetifolia excess removed with a swab moistened with solvent and tightly wrung out, and then produce the drying surface to remove the solvent. Later in the defect zone and adjacent bare surface rubbing thin continuous layer of metallopolymer Germeter-1 and maintain it until the end of time its viability. Then put the second continuous layer of metallopolymer Germeter-1, ensuring full coverage of the first layer, followed by exposure of metallopolymer Germeter-1 for at least 36 hours.The proposed method is characterized by simple technology sealing proceratium defects, high reliability eliminate corrosion damage and can be used inside the habitable compartments of KLAH. This prevents the spread of corrosion corroded zone, sushestvovanii defects on the layout of the hull. The method of fixing corroded defects metal surface, including cleaning the metal surface and application of a material that prevents the development of corrosion, characterized in that the cleaning of metal surfaces carry around the area of the defect, and the quality of the material, preventing the development of corrosion, use low viscosity anaerobic sealant and metallopolymer Germeter-1, whereby the area of the defect cause low viscosity anaerobic sealant, and metallopolymer Germeter-1 applied in two layers with the first layer is applied after curing anaerobic sealant overlapping area of the defect, and after a time his vitality put the second layer overlapping the first, then exercise patience until the final curing metallopolymer Germeter-1.
FIELD: reconditioning of threads of components.
SUBSTANCE: the invention is dealt with repair and recovery of threads on components. Machining is realized by two tools with electrocontact heating of a rotating component. The first tool is installed in a position located in a cavity of a standard thread and conduct finishing-strengthening machining. The second tool is positioned in the beginning of a worn thread and displaced in respect to the first. Movement of the second tool is exercised along the spiral line at the point of overlapping of coils of the threads of the first and second tools and the electrocontact reconditioning is made at the expense of plastic redistribution of the material. The machining is realized with a different force of pressing of the tools to the treated surfaces. The invention allows to restore the profile of the thread and to improve its properties on the components having a wear on a separate section along the length of the of a spiral surface.
EFFECT: the invention ensures reconditioning of the profile of the thread, improvement of its properties on the components having the worn separate sections along the length of the spiral surfaces.
FIELD: manufacture or restoration of worn surfaces of parts, mainly of carbon construction steels.
SUBSTANCE: method comprises steps of plotting (before deformation) curves of plastic yielding of austenite in real coordinates "stress-deformation"; setting according to curves of plastic yielding mode of hot plastic deformation; performing single heating up to temperature higher than Ac3, hot plastic deformation in selected modes and quenching. Isothermic seasoning of parts is performed before quenching for creating polygonal structure of hot-deformed austenite. Quenching is realized directly after hot plastic deformation without isothermic seasoning of hot-deformed austenite. Material is shifted due to metal reserved at stage of making parts.
EFFECT: enhanced constructional strength of parts of carbon construction steel, lowered energy and materials consumption.
4 cl, 2 ex
FIELD: restoration of cast iron rolling rolls with journals damaged at operation.
SUBSTANCE: method comprises steps of mechanically removing damaged layer and performing electric arc surfacing of rotated roll in place of damaged layer removal while feeding steel austenite wire electrode with diameter 3 - 5 mm to welding zone. Surfacing is realized at density of electric current 30 - 40 A/sq. mm and at electrode feeding speed 80 - 110 m/h. After surfacing journal is subjected to spontaneous cooling.
EFFECT: possibility for completely restoring geometry size of operational properties of damaged roll at keeping the same values of its hardness and strength.
1 tbl, 1 ex
FIELD: machine part restoration, namely restoration methods suitable for using in aircraft engines, machine engineering and other branches of technology for restoring rubbing surfaces of cylindrical parts.
SUBSTANCE: method comprises steps of mounting on surface of part prepared for restoration before surfacing, blank of additive material in the form of band; using band with thickness 0.1 - 5.0 mm and mounting it at gap no more than 0.2 mm; performing multi-layer surfacing of additive material in vacuum by means of scanning electron beam; mechanically working part after surfacing each layer of additive material.
EFFECT: simplified process of surfacing material, elimination of residual stresses and deformations in article.
11 cl, 2 dwg, 1 tbl
FIELD: strengthening carrying parts of railway road moving stock, mainly over-spring beams of carriages with center plate.
SUBSTANCE: method comprises step of placing wear -resistant insert to center plate seat enlarged seat by heating it at least until 250°C. Then insert is loaded for closely pressing it to supporting surface at resting of over-spring beam upon its lower band by action of spinning tool having convex surface engaged with insert in order to bend supporting surface of center plate and provide its elastoplastic deforming at residual deformations no more than 0.3%. Elastoplastic deforming is started at time moment of occurring (at cooling process) tightness between beads of center plate and insert and it is terminated at touching of whole contact surfaces of insert and spinning tool at temperature of center plate no more than 150°C. Then over-spring beam is unloaded.
EFFECT: increased useful life period of center plate assembly due to enhanced fatigue resistance of center plate and wear resistance of its supporting surfaces.
1 dwg, 1 ex
FIELD: metal working, namely metal flaw removing by multi-pass electron-beam welding, possibly manufacture of parts of aluminum and its alloys in power production, metallurgical industry branches.
SUBSTANCE: method comprises steps of melting zone of flaw by means of electron beam moving at variable frequency and amplitude during welding cycle along path of eight-beam raster; positioning focus of beam on surface of article or defocusing beam due to changing focusing electric current by value no more than +/- 5% of value of electric current passing at arrangement of focus on surface of article; during period of electric current decrease performing welding procedure in such a way that to lower width of each successive layer in comparison with previous one. Surface area of welded joint central zone formed in result of crossing portion of welded joint in each direction of eight-beam raster is no more than 1/25 of total surface area of welded seam.
EFFECT: enhanced quality of welded joint.
1 cl, 1 dwg
FIELD: railway road moving stock, namely restoration and strengthening of mounting seats for bearings of journal boxes.
SUBSTANCE: method comprises steps of building up end portions of axles of mounting seats of journals subjected to restoration and strengthening by surfacing metal whose mechanical properties are no less than those of axle metal in order to lengthen said end portions by value that is equivalent by volume to worn volume of mounting seats while taking into account allowance for mechanical working; alternatively locally heating mounting seats up to temperature higher than Ac3 in Fe-C diagram and performing their lengthwise hot upsetting at applying load normal relative to end surface of axle arranged near restored mounting seat until widening it along its whole length while taking into account allowance for mechanical working; cooling heated part of axle in air until temperature lower than 600°C; similarly upsetting mounting seat of opposite side of axle; centering end faces and mechanically working mounting seats and end portions of axle.
EFFECT: increased useful life period, enhanced operational reliability of wheel pair axles.
FIELD: processes for restoring steam turbine blades with damaged edges.
SUBSTANCE: method comprises steps of removing worn portion and then surfacing in impulse mode metal whose ductility exceeds that of blade material; welding on protection cover strip by two seams while forming one seam on base material of blade and forming other seam on surfaced metal. Surfaced metal has high cracking resistance; its melting temperature is less than that of base material of blade. Heat treatment with use of heat insulation jacket is performed after surfacing and welding on of protection cover strips.
EFFECT: lowered non-uniformity of structure-phase composition of material of restored blade, reduced tension residual stresses, enhanced resistance of blade against cracking, corrosion and erosion.
4 cl, 1 dwg, 1 tbl
FIELD: restoration of worn parts of aluminum alloys, for example restoration at strengthening of bearing units of gear pumps.
SUBSTANCE: method comprises steps of gas-shield surfacing; mechanical working; strengthening part by micro-arc oxidizing in alkali electrolyte; impregnation of strengthening coating with oil. Micro-arc oxidizing is performed in electrolyte containing 7 g/l of sodium hydroxide and 15 - 16 g/l of potassium-containing liquid glass in anode-cathode mode at using density of cathode current 32 A/dm2 ;relation of cathode and anode currents 1.05 - 1.07; final anode voltage for forming strengthening coating 400 - 420 V; and final cathode voltage 85 - 100 V. Strengthening coating is impregnated with oil (for air crafts) having kinematic viscosity (1.9 - 2.1)10-5 m2/s and heated until temperature 150 - 160°C.
EFFECT: increased oil absorption capacity of strengthening coating due to its increased volumetric porosity, lowered time period of running-in of restored and strengthened parts.
FIELD: processes for repairing laminate articles having different-structure layers, namely noise suppression apparatuses, articles having first and second facings separated by intermediate layer such as honeycomb panels.
SUBSTANCE: method comprises steps of introducing adhesive into zones of exfoliation of facing from honeycomb filler; making fastening member of wire piece and preliminarily imparting to it П-shaped configuration; introducing free ends of П-shaped fastening member in openings for fixing them at tightness; in addition arranging bearing plate on supporting facing and drilling in said plate openings for ends of wire fastening member while aligning openings of plate with openings drilled in panel.
EFFECT: possibility for repairing acoustic honeycomb panel without significant changes of its constructional members at minimum declining of operational characteristics of panel and of the whole engine.
9 cl, 13 dwg