Method for producing metallic sleeves with submicro- and nano-crystalline states of material

FIELD: plastic working of metals, possibly manufacture of sleeves with fine crystalline structure.

SUBSTANCE: method comprises steps of simultaneously working inner and outer surfaces of hollow blank; working inner surface by multiple reciprocation axial motion of expanding punch; working outer surface by rolling around in roller die while fixing ends of blank and squeezing blank.

EFFECT: improved mechanical properties of ready articles, lowered metal consumption.

1 dwg, 1 ex

 

The invention relates to a pressure treatment of metals, in particular, to methods for producing metal sleeves.

A known method of manufacturing bushings, including the production of billets and the subsequent processing of the inner surface of the hand punch while simultaneously rolling the outer surface of the roller matrix with fixing the ends of the workpiece.

However, the known method has the following drawback: the metal structure remains coarse, which impairs the mechanical properties of the sleeves.

The problem to which the invention is directed, is the enhancement of the mechanical properties of the liner, reducing the consumption of metal.

This is achieved in that in the method of manufacturing bushings, including the production of billets and the subsequent processing of the inner surface of the hand punch while simultaneously rolling the outer surface of the roller matrix with fixing the ends of the workpiece, the processing of the internal surface of the workpiece carry out multiple reciprocating axial movement of the dealer tool, and tested the outer surface is performed with the crimping of the workpiece.

The invention is illustrated by the drawing, which shows a diagram of a method of receiving sleeves.

The method is as follows. The workpiece 1 is installed on a support 2, and the ends of the fixed clamp is m 3. Procurement report torque, then the inner surface is formed of multiple reciprocating axial movement of the distributing plug-mandrel 4 having a section of larger diameter, and the outer - running with the crimping roller in the matrix 5, and then throw the rollers, remove clamp and remove the finished sleeve.

Example. Took a hollow billet with a diameter of 30×6 mm, height 25 mm, obtained by vacuum suction, bronze Br oscs 5-5-5, was placed on the position of the processing roller in a matrix on a support and fixing of the ends of the workpiece clamp. Then the workpiece reported torque and drove to the workpiece rollers and simultaneously the inner surface formed of multiple reciprocating axial movement of the distributing plug-mandrel with a diameter of 18 mm with a force of 20 kN. After running all items returned in original condition and remove the finished sleeve from the position processing.

As a result received a sleeve of crushed crystalline metal structure and improved mechanical properties. The surface roughness comply with the specifications for this product.

This method allows you to:

to improve the mechanical properties of the bushings;

- reduce the consumption of metal.

Method of producing metal bushings with submicro - and nanocrystal the practical conditions of the material, including the production of billets and the subsequent processing of the inner surface of the hand punch while simultaneously rolling the outer surface of the roller matrix with fixing the ends of the workpiece, wherein the machining of the internal surface of the workpiece is performed by hand by repeatedly reciprocating axial movement of the punch, and tested the outer surface of the produce with the crimping of the workpiece.



 

Same patents:

FIELD: non-ferrous metallurgy, namely thermal-mechanical working of titanium alloys, possibly manufacture of sheets of high-strength β-titanium alloys by rolling process.

SUBSTANCE: method for producing sheets comprises steps of hot pressing of ingot to slab; processing slab; subjecting it to hot and cold rolling and to heat treatment. Hot pressing of ingot to slab is realized at temperature exceeding by 400-440°C temperature value Tpc of polymorphous conversion. Hot rolling is realized by three stages. At first stage rolling is performed at temperature exceeding by 400 - 430°C temperature Tpc at total deformation degree 71 - 95%. At second stage rolling is performed at temperature exceeding by 60 - 80°C temperature value Tpc at total deformation degree 20 - 30% with single reduction values 3 - 5%. At third stage rolling is performed at temperature exceeding by 160-180°C temperature value Tpc with total deformation degree 51 - 90% and single reduction values 5 - 7%. Then annealing is realized at temperature exceeding by 80 - 180 °C temperature value Tpc and cooling in temperature range 750 - 350°C with deformation rate 100-300°C/min is performed. Cold rolling is performed at total deformation degree 8 - 20%.

EFFECT: increased stabilized strength and ductile properties of materials.

FIELD: non-ferrous metallurgy, namely thermal-mechanical working of hard-to-form high-strength β-titanium alloys, possibly manufacture of thin sheets by rolling.

SUBSTANCE: method comprises steps of mechanically working surface of slab; subjecting it to hot, warm and cold rolling; annealing and aging it. After mechanical working, slab is subjected to scooping and to hot rolling during two stages. At first stage rolling is realized at polymorphous conversion temperature Tpc + (380 - 400)°C and at total deformation degree 85.0 - 95.0% and then blank is subjected to further annealing at temperature Tpc + (145 - 165)°C. At second stage rolling is realized at temperature Tpc + (100 - 120)°C with total deformation degree 45.0 - 55.0% and to further annealing in temperature range Tpc + (50 - 165)°C. Warm rolling is realized at temperature Tpc + (10 - 30)°C with total deformation degree 40 - 60 % for further annealing in temperature range Tpc + (70 - 100)°C. Cold rolling is performed at total deformation degree 50.0 - 55.0%.

EFFECT: improved stable strength and ductile properties of material.

FIELD: foil or thin strips of refined aluminum with high purity degree used after treatment of surface by etching for making anodes of electrolytic capacitors, namely high - voltage capacitors.

SUBSTANCE: foil or thin-sheet strip of refined aluminum with purity degree more than 99.9% has surface zone with depth 10 nm containing 5 - 25 at.% of aluminum carbide. Foil or thin strip is produced by casting sheet of refined aluminum; homogenizing and hot rolling, cold rolling and subjecting it to final annealing. The last operation is realized in neutral atmosphere at adding gas containing carbon atoms for forming surface zone with depth 10 nm containing 5 - 25 at.% of aluminum carbide. Gas containing carbon atoms is selected from group including methane, propane, butane, iso-butane, ethylene, acetylene, propene, propyne and butadiene.

EFFECT: foil or strip having improved trend for etching and allowing enhance in addition working characteristics of electrolytic capacitors.

4 cl, 1 tbl, 1 ex

FIELD: aerospace industry; nonferrous metallurgy; other industries; methods of the thermomechanical processing of the articles made out of the titanium alloys.

SUBSTANCE: the invention is pertaining to the field of nonferrous metallurgy, in particular, to the thermomechanical processing of the articles made out of the titanium alloys and may be used in the aeronautical engineering for manufacture of the skins, envelopes, containers, partitions, the bottoms. The invention presents the method intended to up-grade the level of the mechanical processing of the articles, which provides for the thermomechanical processing of the articles made out of the titanium alloys, including their multiple heatings up to the temperature of above or below the temperature of the polymorphic transformation Тtp and deformation. The thermomechanical processing includes nine phases. At that at the first phase they conduct the heating of the titanium alloy up to the temperature of(Ttp +230 ÷ Ttp +270)°С, its deformation with the level of 50÷90 %; at the second phase - the heating up to the temperature of(Ttp - 20 ÷ Ttp-40)°С, the deformation with the deformation level of 30÷60 %; at the third phase - heating up to the temperature of (Ttp +60 ÷ Ttp+160)°С, the deformation with the level of 20-60%; at the fourth phase - heating up to the temperature of (Ttp-10 ÷ Ttp -40)°С, deformation with the level of 40-70%; at the fifth phase - heating up to the temperature of(Ttp -40 ÷ Ttp+200)°С, the deformation with the level of 65-95 %; at the sixth phase - heating up to the temperature of (Ttp -100 ÷ Ttp -160)°С, the deformation with the level of 40-70 %; at the seventh phase - heating up to the temperatures of(Ttp-100 ÷ Ttp -160)°С, the deformation with the level of 20-50 %; at the ninth phase - hearing up to the temperature of (Ttp -150 ÷ Ttp -190)°С, the deformation with the level of 2-5 %.

EFFECT: the invention ensures the increased level of the mechanical properties of the articles made out of the titanium alloys.

1 tbl, 3 ex

FIELD: nonferrous metallurgy; aircraft industry; other industries; methods of the thermomechanical processing of the articles made out of the titanium alloys.

SUBSTANCE: the invention is pertaining to the field of nonferrous metallurgy, in particular, to the thermomechanical processing of the articles made out of the titanium alloys and may be used in the aeronautical engineering. The invention presents the method of thermomechanical processing of the articles made out of the titanium alloys providing for their multiple heatings up to the temperature of above or below the temperature of the polymorphic transformation Ttp and deformation in the process of cooling to the temperature below Ttp, aging and cooling. The thermomechanical processing includes eight phases. The first phase includes the heating of the titanium alloy up to the temperature of (Ttp+280÷Ttp+350)°С, its deformation within four runs at cooling up to the temperature of (Ttp-4О÷Ttp-100)°С with the change of the deformation direction by 90° at alternation of the yielding and drawing with the deformation level of 20÷50 % at each run; at the second phase - exercise heating up to the temperature of(Ttp+100÷Ttp+160)°С, the deformation in four runs at cooling to the temperature of (Ttp-100÷Ttp-180)°С with the change of the deformation direction by 90°С at alternation of the yielding and drawing with the deformation level of 20÷50 % at each run; at the third phase - heating up to the temperature of(Ttp-20÷Ttp-40)°С, the deformation by yielding with the level of 20-60% in the process of cooling to the temperature of (Ttp-110 ÷ Ttp -130)°С; at the fourth phase - heating up to the temperature of(Ttp + 20÷Ttp -50)°С, deformation by drawing with the level of 30-70% in the process of cooling to the temperature of(Ttp -110 ÷ Ttp-130)°С; at the fifth phase - heating up to the temperature of(Ttp -20 ÷ Ttp-40)°С, the deformation by yielding of with the level of 20-60 % in the process of cooling to the temperature of(Ttp -110 ÷ Ttp -130)°С; at the sixth phase - heating up to the temperature of (Ttp +100 ÷ Ttp +130)°С, the deformation by drawing at the rolling with the level of 55-80 %; at the seventh phase - heating up to the temperatures of(Ttp -20 ÷ Ttp -40)°С, the deformation by drawing at the rolling with the level of 30-40 %; at the eighth stage - heating up to the temperature of(Ttp -360 ÷ -500)°С with the aging for 5-20 hours. The technical result of the invention is the increased level and the decreased anisotropia of the mechanical properties of the articles.

EFFECT: the invention ensures the increased level and the decreased anisotropia of the mechanical properties of the articles.

1 tbl, 2 ex

FIELD: aerospace industry; rocket industry; other industries; methods of the thermomechanical processing of the articles made out of the titanium alloys.

SUBSTANCE: the invention is pertaining to the field of nonferrous metallurgy, in particular, to the thermomechanical processing of the articles made out of the titanium alloys and may be used in the aeronautical engineering and rocketry for production of the containers, girders, longerons, bulkheads, landing gear and fastening components. The invention presents the method intended to up-grade the level of the mechanical processing of the articles, which provides for the thermomechanical processing of the articles made out of the titanium alloys, including their multiple heatings up to the temperature of above or below the temperature of the polymorphic transformation Ttp and deformation. The thermomechanical processing includes seven phases. The first phase includes the heating of the titanium alloy up to the temperature of(Ttp+200÷Ttp+270)°С, its deformation within four runs with the change of the deformation direction by 90°C at alternation of the yielding and drawing with the deformation level of 20÷50 % at each run of the deformation; at the second phase - they exercise heating up to the temperature of(Ttp+170÷Ttp+230)°С, the deformation in four runs with the change of the deformation direction by 90°С at alternation of the yielding and drawing with the deformation level of 20÷40 % at each run of the deformation; at the third phase - heating up to the temperature of (Ttp-20÷Ttp-40)°С, the deformation by yielding with the level of 20-60%; at the fourth phase - heating up to the temperature of(Ttp + 60 ÷ Ttp + 120)°С, deformation with the level of 20-60%; at the fifth phase - heating up to the temperature of(Ttp -20 ÷ Ttp-40)°С, the deformation with the level of 20-60 %; at the sixth phase - heating up to the temperature of (Ttp +30 ÷ Ttp +90)°С, the deformation with the level of 20-60 %; at the seventh phase - heating up to the temperatures of(Ttp -20 ÷ Ttp -40)°С, the deformation with the level of 20-50 %.

EFFECT: the invention ensures the increased level of the mechanical properties of the articles made out of the titanium alloys.

2 cl, 1 tbl, 3 ex

FIELD: plastic working of metals, possibly forging blanks of nickel base super-alloy.

SUBSTANCE: method is realized with use of forging press with forging die sets of nickel base super-alloy having yield limit no less than stress of plastic yielding of super-alloy at forging for making forged pieces at temperature range approximately from 926.67°C till approximately 1010.00°C at nominal deformation rate. Blank for forging and die sets are heated till said forging temperature. Forging is realized at such temperature and at nominal deformation rate. Nickel base super-alloy selected from group of alloys may be used as material of forged blank. According to one variant of invention blank of compacted powder of nickel base super-alloy is used for forging. In such case die sets are made of nickel-base super-alloy containing, mass%: aluminum, approximately 5 - 7%; molybdenum, approximately 8 - 15%; tungsten, approximately 5 - 15%; magnesium, near 140 ppm; nickel and impurities, the balance.

EFFECT: lowered costs for producing forged pieces of super-alloy with desired properties.

15 cl, 3 dwg, 2 tbl

FIELD: processes for treating metallic belts and producing magnetic-mechanical markers for electronic inspection of articles.

SUBSTANCE: method comprises steps of annealing thin belt of metallic ferromagnetic alloy at continuously transporting it through furnace for imparting to it predetermined magnetic characteristics and for eliminating lengthwise curvature of belt caused by manufacturing process. At process of heat treatment belt is guided along practically straight duct of clamping attachment of annealing furnace. Said duct is characterized by weakly bent portions along its length, namely in zone of belt introducing in annealing furnace. Slightly bent duct provides improved heat contact between belt and heat accumulator.

EFFECT: possibility for performing process with very high annealing rates without deterioration of belt characteristics.

39 cl, 1 ex, 2 tbl, 12 dwg

FIELD: plastic working of metals, possibly manufacture of blanks designed for producing hollow thin-wall articles such as aluminum tubes, bottles.

SUBSTANCE: method comprises steps of feeding initial predetermined-size material to pressing machine having working units. In said working units initial material is subjected to successive parametric pressing by transitions. Pressing is realized at speed directly proportional to specific pressure of pressing process according to relation: Vt = KPt where Vt -parametric pressing speed at time moment t; Pt - specific pressure of pressing process at time moment t; K = (Pend - Pst)tk - proportionality coefficient; Pend - specific pressure at pressing process termination; Pst - specific pressure at pressing process starting; tk - time period of pressing process.

EFFECT: improved quality of blanks, enhanced efficiency of production of ready articles.

2 cl, 1 dwg

FIELD: non-ferrous metallurgy, namely production of wire from tin-zinc bronze designed for making elastic members in important electric connectors.

SUBSTANCE: method comprises steps of forming blank by hot deformation; multiple drawing of blank till desired dimension of wire; before each at least three last drawing passes realizing low-temperature annealing at temperature 230±10°C and at soaking for 45 - 60 min; performing each of three last multiple drawing passes at elongation factors in range 1.25 - 1.45.

EFFECT: possibility for achieving optimal combination of strength and plastic characteristics.

FIELD: machine engineering, possibly manufacture and restoration of inner cylindrical surfaces.

SUBSTANCE: burnishing tool includes loading device and two cone guides over cone of which balls move. One cone guide is rigidly joined with tie rod of loading device. Second cone guide is mounted with possibility of lengthwise motion along it. Said cone guides are inclined relative to plane normal to axis of tie rod of loading device.

EFFECT: simplified design of tool, improved working quality.

2 dwg

FIELD: metallurgy, namely strengthening crankshafts of internal combustion engines at making and restoring them.

SUBSTANCE: method comprises steps of simultaneously rolling out both fillets of one journal of crankshaft by means of three pairs of deforming rollers with different profile radiuses; mounting rollers by angle φ = 43 - 48° relative to axis of worked journal of shaft and applying working load to rollers by the same angle. Profile radius of minimum curvature rollers R1r = 0.96 Rf where Rf - radius of worked fillet. Deforming effort acting upon each roller is determined according to condition for providing percentage depth of plastic deformation propagation at rolling out by means of minimum curvature rollers hs/D = 0.015. Curvature degrees of other two pairs of rollers are determined according to condition providing specific contact pressure 2000 - 2100 MPa and 2400 - 2500 MPa by means of given formula where p - mean specific pressure in contact zone, MPa; F - deforming effort, N; Rr - radius of rolled out fillets, m; Dj - diameter of crankshaft journal, m.

EFFECT: enhanced efficiency and quality of worked surface of fillets of crankshafts.

5 dwg, 2 tbl, 1 ex

FIELD: ferrous metallurgy, stainless steels in particular; production of pipes of enhanced corrosion resistance for erection of pipes lines carrying corrosive media.

SUBSTANCE: proposed stainless steel contains carbon, silicon, manganese, chromium, nickel, molybdenum, iron and unavoidable admixtures. Method of production of pipes from stainless steel includes making steel, teeming it into ingots, deformation of ingots into tubular billets, hot extrusion followed by heat treatment. After teeming of steel and deformation of ingots, pipe billets are molded in pipes and pipes are subjected to fast cooling in water; heat treatment is performed by austenization at temperature of 1030-1050°C at holding pipe wall thickness within 1 min/mm followed by cooling in air. This method may be used for production of pipes of large diameters (up to 159-219 mm); proposed steel has balanced chemical and phase composition.

EFFECT: improved mechanical properties.

3 cl, 2 dwg, 2 tbl, 2 ex

FIELD: mechanical engineering; working of various hardened details with alternating prominences and cavities.

SUBSTANCE: the invention is pertaining to the method of the large-grain traction sprockets gears working and may be used in various branches of engineering, in particular, for working of the various hardened details with alternating prominences and cavities. The working of the hardened gears by a superhard edge tool substitutes the cost intensive process of the gears grinding. The offered method includes the following set of the processes: existing traditional turning of a sprocket; the gears milling; the gears surface hardening up to HCR-51 hardness; the gears shaping by the edge tool; the final working - the surface plastic deformation of the whole working contour of the gears - the evolvents, as well as the junction curve and pits between the gears. At the edge tool working the uniform cutting off of the allowance in length (in height) of the gears takes place. Together with the metal cuttings all the defects gained after hardening are removed, and there is no inaccuracies on the worked surface, which may be observed after the gears grinding. At the gears lengthwise shaping there is the minimal facet pattern of 0.05-0.07 microns with the roughness along the whole length of the gears contourRa = 1.2-1.4 microns, that ensures the suitable conditions for realization of the surface hardening operation. The applied method improves the quality and reliability of the gears operation and so promotes its implementation in the mechanical engineering enterprises and, in particular, at the railway transport repair enterprises.

EFFECT: the invention makes it possible to substitute the cost intensive process of the gears grinding, ensures improved quality and reliability of the gears operation.

FIELD: local vibration treatment of welding seams.

SUBSTANCE: the invention is pertaining to the devices for a local vibration treatment of welding seams and may be used for removal of residual stresses in the metal details mainly having a closed loop of type of pipes, rings, shells made with application of welding. The exciter of vibrations place in symmetry to the plane the welding seam in a zone of the heightened levels of the residual stresses and fix by means of a pin. On the flanges of the body of the vibration exciter by means of covers fix the elastic shell to form a working chamber. The working medium through a coaxially located channel and conjugated with it radial holes is fed in the working chamber. Onto the inlet of the device for vibration treatment of the welding seams by means of the working medium a periodically varying in time pressure is fed from the pressure pump. The pressure developed at that is transferred through the elastic shell to a treated component. The device ensures a purposeful action on those components of the tensor of the residual stresses, which have the greatest levels of stresses and determine the intensity of a stressed state in the dangerous cross-sections. In addition the offered device ensures uniformity of the action along a pipe cross-section perimeter.

EFFECT: the invention ensures determination of levels of the stresses intensity in the dangerous cross-sections as well as uniformity of the action along the pipe cross-section perimeter.

3 cl, 2 dwg

FIELD: machine engineering, namely manufacture of threaded parts operating at sign-variable loads and in condition of abrasive wear.

SUBSTANCE: method comprises steps of finish strengthening working of part by means of tools at electrically heating part mounted with possibility of rotation. In order to enhance efficiency and quality of threaded surfaces, working is realized by means of combination tool whose mean portion is made of wear resistant electrically non-conducting material. Electric contact working of lateral surfaces of thread is realized at sliding pressure contact, at supplying electric current to tools and simultaneously applying effort to them. Mean portion of tool is used for working recess and forming micro-geometry and texture of metal fibers. Boundary portions of tool are used for quenching surface layer.

EFFECT: improved efficiency and quality of threaded surface.

1 dwg, 1 ex

The invention relates to metal working and can be used in various fields of engineering, namely for hardening various parts with alternating protrusions and depressions

The invention relates to cold working of metals and alloys by the method of plastic deformation and can be used in mechanical engineering for finishing cylindrical surfaces vibracathedral to get on the friction surfaces of a given micro-relief, which provides optimal conditions lubrication, minimum friction and minimum wear

The invention relates to mechanical engineering and can be used to improve wear resistance and cyclic durability of machine parts

FIELD: carbon materials.

SUBSTANCE: invention relates to preparing carbon nanostructures on surfaces of solids with the aid of electron probe and can be used in electron lithography to make shields used for subsequent formation of semiconductor structures via chemical, plasma, and ionic etching. Method of invention comprises applying fullerite film onto substrate, irradiating in vacuum areas of film having specified shape and dimensions with at least one electron beam with diameter lesser than minimum linear dimension of resulting elements of structure until material of these areas is converted into polymerized fullerite, after which non-irradiated areas are removed by treatment with organic solvent. Thickness of film is selected lesser than depth of penetration of electrons into film material. Whole structure obtained after treatment with organic solvent is then evenly irradiated with electron beam to convert polymerized fullerite into amorphous carbon.

EFFECT: increased lateral resolution of carbon structure characterized by high electric conductivity and heat resistance.

3 cl

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