RussianPatents.com
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Method of reconditioning and hardening plough shares. RU patent 2457090. |
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FIELD: process engineering. SUBSTANCE: invention may be used in repair of tillage machinery, particularly, plough shares operated in conditions of abrasive wear. Beam-like wear on outer edge is sealed by low-carbon electrode material. After cutting edge forging, hardening rolls are welded on reconditioned surface. EFFECT: higher strength and rigidity. 5 dwg
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Method of reconditioning large-size nitride-hardened crankshaft scored hollow journals by high-frequency current / 2455141 Invention relates to reconditioning large-size nitride-hardened crankshaft scored hollow journals by high-frequency current. Damaged journal, its cylindrical section and lubing orifices are machined to complete removal of nitride-hardened layer. Protectors are fitted into lubing orifices. Journal first hardening is performed by surface induction heating with revolving crankshaft. Journal second hardening is performed by surface induction heating with revolving crankshaft and journal preheating and further heating to hardening temperature in one revolution of crankshaft. Journal heated layer is cooled in every hardening by removing heat into journal body and webs in journal bend. Bearing fillets are cold-hardened to crankshaft beat not exceeding 0.05 mm and journal bearing seats are ground. Prior to heating, nitride-hardened layer is partially removed from journal inside as well as cast peel and cracks, if any, to fill is with mix of bentonite, metal shots and water. |
Method of shaft recovery / 2453413 Invention relates to shaft-type part worn-out surface recovery or hardening. Shaft journal is turned to produce lateral surface at distance from bearing fillet corresponding to shaft journal nonhardened section at angle to temporary recess bottom. Chamfer is produced at angle of 15-35° to vertical plane over the entire width of thin-wall strip made up of split ring or semi-rings. Thin-wall strip is secured at distance from said lateral surface of shaft journal equal to 1.0-3.0 mm along bottom of aforesaid temporary recess to make a groove between said lateral surface and strip chamfer. Thin-wall strip is welded to shaft journal in protective gases on arranging electrode in said groove to make annular weld seam. |
Method of hardening working surface of agricultural machinery ploughshare / 2453412 Invention relates to the field of agricultural machinery industry and repair of machinery, namely to a method of hardening the working surface of ploughshare of agricultural machinery, operated under conditions of abrasive wear. On the most affected by wear working surface of the ploughshare a composite abrasive-resistant surface is created by electro-mechanical processing to form hardened areas of 3-4 mm in width and a depth of not less than 1.5-2 mm, the microhardness of 650…710 Nm increments of 20-30 mm at an angle to the cutting edge of the detail. |
Method of reconditioning steel parts / 2451589 Invention relates to welding and may be used in reconditioning and hardening worn-out steel part by electric contact welding of medium-carbon steel band to steel part. Medium-carbon steel band is subjected to preliminary thermal treatment. First, complete annealing is performed. Note here that fine grains are obtained in part structure with uniform distribution of ferrite grains. Then, high tempering is effected. After removing scale, said treated band is welded to steel part being reconditioned. |
Method of producing ice cast-iron cylinder head valve seat or reconditioning them by arc deposition / 2448825 Invention may be used in reconditioning or producing internal combustion engine valves. Machining is carried out after valve surface cleaning and flaw detection. Seat is made by arc deposition on valve seat surface. Nickel sublayer is built up by short arc of forward polarity current in atmosphere of welding gas with forging the built-up bead at the rate not allowing metal chilling. Surface with nickel deposition is subjected to machining. Working layer of austenitic heat-resistant steel is deposited by consumable electrode with reverse polarity current and forging of every bead at the rate not allowing metal chilling. Seat working surface is subjected to finishing. |
Method of reconditioning locally worn-out surfaces of structural parts moulded from plastic materials and those of limited plasticity, and device to this end / 2447981 Invention relates to reconditioning of structural parts. Deformation limiter is arranged to fit base surface on unworn section of reconditioned surface, worn surface topograms are taken, plastic deformation magnitudes and points are defined. Reconditioned surface is prestressed by extending retainer to plastic state to fit indentor into prestressed section and up reconditioned surface to initial position. Holes produced by indenter are filled with antifriction material and deformation limiter is removed. Proposed device comprises extending retainer to prestress reconditioned surface arranged in axial hole of deformation limiter to axially displace. Note here that said indenter is aligned with extending retainer. |
Method of repairing metal structures with surface cracks and device to this end / 2446932 Invention may be used in repair of metal structures with open surface defects by metallothermic welding. Cracks are detected by pickup made up of string crack metering device, strain gauge and tail pickup arranged on metal structure surface in zones of probable crack formation to transmit data by radio signals to central control station and, via controller, to movable welding device. Progressive crack is detected by the rate of its development and sizes, crack coordinates are defined and radio signals from appropriate pickups are used to move welding device to crack location. Metallothermic mix is fired and fused in welding device replaceable vessel. Said replaceable vessel emptied and crack filled with fused metal, data on operation of welding device is transmitted to central control station for said device to be returned to initial position. |
Device to retain components in method for repair of single-block turbine wheel blade / 2446931 Invention relates to a device for retention of components during repair of a blade of a single-block turbine wheel by means of electron-beam welding of an insert with a blade along the joint plane. The device comprises facilities to retain the wheel and facilities for controlled retention of the blade and the insert. The facilities for controlled retention of the blade and the insert comprise a support, where facilities are placed to retain the blade and the insert so that the space above the joint plane makes it possible for the electron beam to pass through. The relative position of the blade and the insert is controlled with the help of facilities installed on a single support, letting the electron beam pass through. |
Method of hardening turbo machine nozzle vane unit made from nickel and cobalt alloys / 2445199 Invention relates to machine building and may be sued for improving operating performances of gas turbine hot section parts in aircraft, ship and power generating gas turbine engines: nozzle vanes including nozzle units segments made from nickel and cobalt alloys. Proposed method comprises forming refractory coat on surfaces of nozzle unit top and bottom flanges and vane body and applying thermal-protective ceramic layer only on outer surfaces of bottom flange and vane body and on surface of transition zone between top flange and vane body. Note here that thickness of said protective layer on different elements of nozzle units varies from 10 mcm to 300 mcm depending upon compensation of temperature difference of unit elements. |
Method of repairing fractures in metal structures / 2444425 Invention may be used for repairing and reconditioning metal structures with fractures. Fracture is welded up by local point heating and remelting of main metal along fracture with the help of contact point or side-seam welding machine to produce solid center. Welding-up is performed along entire length of the fracture to overlap produced said core by, at least, 30%. Ultrasound oscillations are fed into fracture zone during the entire welding-up cycle to accelerate cleaning and removing of oxide films from fractures, to produce homogeneous structure of welded seam, to decrease weld stresses, to increase quality and strength of welded seam. |
Method of welding by three-phase arc / 2451584 Proposed method may be used for welding of wear-resistant hardening coats by three-phase arc. Third phase of current source is connected to article in half-cycle opposite that of connecting filler wire. Interval of half-cycles corresponds to that of welding current set by current source frequency. Connection of article and wire allows cathodic cleaning of their surface. Wire and article may be connected in AC half-cycles in both straight and reverse polarity. |
Plowshare of increased resistance to abrasive wear / 2450496 Invention may be used in the manufacture of plowshares of plows for different purposes. Increasing resistance of plowshares to abrasive wear is achieved by welding on metal of high hardness (60 HRC) on the width of 7-8 mm along the landward edge and the blade part of the edge in the form of chisel and welding with deep penetration of the same alloy at the lower part of the edge at a distance of 60-80 mm. The rest is reinforced with filler by welding of rollers of width of 4-5 mm with a spacing of 30 mm by electrodes for welding carbon steels perpendicular to displacement of soil. |
Method of producing ice cast-iron cylinder head valve seat or reconditioning them by arc deposition / 2448825 Invention may be used in reconditioning or producing internal combustion engine valves. Machining is carried out after valve surface cleaning and flaw detection. Seat is made by arc deposition on valve seat surface. Nickel sublayer is built up by short arc of forward polarity current in atmosphere of welding gas with forging the built-up bead at the rate not allowing metal chilling. Surface with nickel deposition is subjected to machining. Working layer of austenitic heat-resistant steel is deposited by consumable electrode with reverse polarity current and forging of every bead at the rate not allowing metal chilling. Seat working surface is subjected to finishing. |
Ferromagnetic charge for arc pad welding machine parts made from iron-carbon alloys / 2448823 Invention relates to machine building and can be used to restore machine parts made from alloyed steel and cast iron. The ferromagnetic charge for arc pad welding machine parts from iron-carbon alloys, which contains carbon, ferrotitanium, ferrochromium, ferrovanadium, electrode marble, fluorpar, silicocalcium, copper powder and iron powder, additionally contains ferrovanadium and copper powder. To ensure stable arcing at low current (reducing the level of welding deformations and stress) and improve magnetic properties of the mixture, magnetic and nonmagnetic components of the charge are mixed on liquid sodium glass. |
Method of reconditioning tillage equipment working tools with complex shape / 2443531 Invention may be used in reconditioning tillage equipment working tool surfaces with complex shape. Worn-out area is prefilled by electrodes made from wear resistant material to perform closing by fusion in one pass by electric arc manual or semiautomatic method to ensure maximum possible tracing of working surface. |
Method of increasing life of tillage equipment working tools / 2443524 Invention may be used in reconditioning tillage equipment working tool surfaces. Rolls are welded on perpendicular to axis of beam-like wear, spaced apart for 20-30 mm to produce spacing between them. Roll height does not exceed the level of working surface of the part being reclaimed. Said spacing is filled in operation by soil that acts as anti-abrasive medium. |
Method of reconditioning center hoes of tillage row-crop cultivators / 2443523 Invention may be used in reconditioning tillage equipment working tool surfaces. Metal stock is formed in point area and along blade length by electric arc deposition by electrode to produce buffer stock of built-up metal that allows recovery of rated sizes of hoes. Building-up may be carried out both manually and mechanically by electric arc deposition. Hoe is drawn out by hot deformation using forming mandrel that follows hoe point and blade shape. Further hardening is performed by quenching. In buffer metal building-up and drawing-out, thermal processes occur to bring about structural components that increase hardness of reconditioned zone and facilitate increasing resistance to abrasive wear. |
Procedure for production of built-up coating on blade body of turbo-machine / 2434973 Strips of alloyed metals are built-up in direction of lengthwise generatrix of blade body ensuring gaps between built-up strips at least on part of blade body and forming layer. As built-up metal there are used alloys on base of nickel with Co, Cr, Al, Mo, W, Ti, Y or their combination. Further, a blade body is mechanically processed ensuring its specified geometry. Successive thermal treatment corresponds to thermo-cycling. |
Turbo machine labyrinth seal repair / 2432244 Invention relates to recovery of turbo machine worn-out labyrinth seals and may be used in repair of various assembly units and parts with such seals, for example, vanes, carcass assembly in aircraft industry, power generation equipment and other machine building branches. Said seals are building-up welding with welding head and filler wire. Welding roll is produced on inclining welding head with filler wire toward part section that features higher heat dissipation. Note here that inclination of welding head with filler wire relative to labyrinth seal knife edge is set between planes of their symmetry to make 8-10°. |
Surfacing method of wear-resistant coatings / 2429954 Surfacing is performed on the flux layer with wire from aluminium or its alloys. Flux containing chrome oxide and cryolite is used with the following component ratio, wt %: chrome oxide (III) 25-35, cryolite 65-75. Surfacing is performed in shielding gases in the modes allowing to obtain the coating containing 10-40 wt % of aluminium. |
Method for surfacing with use of lying electrode / 2243867 Method for surfacing bead of rollers of road building machines comprises steps of arranging roller in such a way that its axis is vertical; dividing surfaced zone of bead by technological sectors; forming electrodes of n mutually joined rods bent along arcs of sectors and arranging them on surfaced area of respective sector with gap; supplying flux and additive powder material to surfaced zone; connecting electrode and part with power source for exciting electric arc and performing surfacing; placing electrodes on sectors of bead simultaneously along the whole circle; electrically connecting front end of one electrode with bead; at surfacing narrow beads, forming electrodes of n mutually joined rods arranged one over another. |
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