Method of producing thin sheets

FIELD: metallurgy.

SUBSTANCE: invention relates to production of thin sheets from ingot of pseudo-alpha titanium alloy. Proposed method comprises forming ingot of alloy Ti-6.5Al-2.5Sn-4Zr-1Nb-0.7Mo-0.15Si into slab and machining of the latter. Then, said slab is heated to temperature exceeding that of polymorphic transition, deformation and multistep rolling to semi-finished rolled stock with regulated total degree of deformation and degree of deformation in a pass. Sheets are stacked, stacks are rolled to finished size and subjected to multipass rolling with regulated total deformation, sheets are extracted from the stack and subjected to finishing.

EFFECT: high and uniform strength and plastic properties.

1 dwg, 2 tbl

 

The invention relates to the processing of metals by pressure, and in particular to methods of manufacturing thin sheets of heat-resistant pseudo-alpha titanium alloy Ti-6,5Al-2,5Sn-4Zr-1Nb-0,7Mo-0,15Si.

A known method of manufacturing parts of the pseudo-alpha titanium alloys, including heat in the beta region above the temperature of polymorphic transformation (hereinafter CCI), cooling, re-heating in the two-phase region, repeated deformation in this region during the cooling process, re-cooling, the final heating in the two-phase region, the shutter speed and cooling (A.S. USSR №1740487, publ. 15.06.1992). The known method is intended for manufacturing of forged and stamped products and not optimized for a sheet of semi-finished products.

A known method of manufacturing sheets of low-alloy titanium alloys, including heat flat ingot, hot rolling the strips, cut strips on the billet, heating the billet in a two-phase region, rolling them on the sheets, heat treatment, etching, editing, cutting sheets to finished size (patent RF №2198237, publ. 10.02.2003). The known method does not take into account technological features alloy Ti-6,5Al-2,5Sn-4Zr-1Nb-0,7Mo-0,15Si.

A known method of manufacturing a particularly thin sheets of high-strength titanium alloys, including the production of the original sheet, the Assembly of the package of sheet blanks from the transfer of yuushin coating using case hot rolling and heat treatment batch, split and finish of the obtained sheets (Patent RF №2381297, publ. 10.02.2010) prototype. However, in the known method are not regulated modes of thermomechanical processing, which does not allow for a given level of mechanical properties and structure.

The problem to which the invention is directed, is the development of a method for manufacturing thin sheets of pseudo-alpha titanium alloy Ti-6,5Al-2,5Sn-4Zr-1Nb-0,7Mo-0,15Si, allowing to provide thin sheets having a homogeneous structure and mechanical properties, and high surface quality and geometrical parameters.

The technical result achieved in the implementation of the invention is to obtain the microstructure of sheets, providing a high and uniform level of strength and plastic properties.

This object is achieved in that in the method of manufacturing thin sheets from an ingot pseudo-alpha titanium alloy according to the invention carry out the deformation of the ingot pseudo-alpha titanium alloy composition of Ti-6,5Al-2,5Sn-4Zr-1Nb-0,7Mo-0,15Si in the slab, machining slab, heating to a temperature of 120÷200°C higher than the temperature of polymorphic transformation (CCI), the deformation from the total deformation rate of 40÷80% with subsequent heating to a temperature of 90÷150°C above the chamber of Commerce, deformats the Yu with a total degree of deformation of 30÷60%, multi-pass rolling to tackle with the total degree of deformation of 50÷80% and the degree of deformation per pass 10÷20% and additional heating after reaching the degree of deformation 10÷30%, heating the strips to a temperature of 20÷40°C lower chamber of Commerce and multi-pass rolling with a total degree of deformation of 10÷30% and the degree of deformation per pass 5÷20% with additional heating after reaching the degree of deformation 10÷30%, Assembly of sheets in the package with the packing so that the direction of the sheets subsequent rolling was perpendicular to the direction of the leaves of the previous rolling, rolling package the finished size with heating to a temperature of 20÷120°C lower chamber of Commerce and multi-pass rolling with a total deformation of the package 50÷85% and a degree of deformation per pass 5÷15% with an additional heating of the package after reaching the degree of deformation 15÷25%, the extraction of the obtained sheets from the package and their auxiliary processing.

The method is implemented as follows.

Produced and machined ingot is heated to a temperature of 120÷200°C above the chamber and subjected to forging with deformation rate of 40÷80%, which destroys the cast structure, averages the chemical composition of the alloy, compacting the workpiece, eliminating such casting defects such as voids, sinks and other Temperature below the specified limit leads to the reduction of plastic characteristics, is Otradnaya deformation and the appearance of surface cracking, the heating temperature is above the specified limit causes a significant increase in gas-saturated layer, which leads to superficial lacerations during deformation, deterioration of the metal surface and consequently to increased metal removal from the surface of the workpieces. The following strain with a degree 30÷60% after heating at 90÷150°C above the CCI allows you to grind the grain size relative to the initial state. For complete removal of surface defects resulting slab mechanical process from all sides to a depth of not less than 5 mm Further multi-pass rolling of the slab to tackle with the level 50÷80% after heating to a temperature of 60÷80°C above the CCI increases the ductility of the metal and limits the formation of defects during subsequent deformation in the (α+β)region. The slab is rolled to the degree of deformation per pass 10÷20%, and after reaching the degree of deformation 1÷30% produce additional heating, which improves the ductility of the metal, to keep the process rolling satisfactory surface quality and to avoid the formation of cracks of thunder. After deformation β is effected by heating the steel to a temperature of 20÷40°C lower chamber of Commerce and carry out multi-pass rolling with a total strain of 10÷30% and the degree of deformation per pass 5÷20% for the destruction of large angle boundaries zere is and increase in the dislocation density, that allows you to prepare a given microstructure to obtain the mechanical properties in the transverse direction, to the further batch rolling to produce the preparation of the microstructure to obtain the mechanical properties mainly in the longitudinal direction. The degree of deformation per pass 5÷15% is defined by the technological properties of the alloy and the conditions of achievement of the minimum thickness variation of the sheet workpiece before the batch rolling. At this stage, after reaching the degree of deformation 10÷30% produce additional hot rolled, allowing you to maintain a satisfactory surface quality. In the absence of the possibility of applying cold rolling to obtain thin sheets because of the low ductility of the alloy and high loads on the mill because of the high deformation resistance of the final deformation of the sheets on the finished size is carried out by the batch method, for which the rolled cut-to-length sheet, while the sheet stack in the direction of rolling so that the direction of the subsequent rolling was perpendicular to the previous direction of rolling. Changing the direction of rolling of the package allows to obtain optimal crystallographic texture in the leaves and reduce the mechanical anisotropy its the STV. Temperature range of heating and the degree of deformation at this stage can increase the level grinding and coagulation of primary α-phase, which contributes to obtaining equiaxial fine micrograins, providing uniform mechanical properties in all directions. After the batch rolling the sheets removed from the package and carry adjusting processing, test sheets and packaging.

Industrial applicability is confirmed by specific example of carrying out the invention.

For receiving sheets 1 mm thick were smelted ingots with a diameter of 190 mm and a length of 260 mm Chemical composition of the alloy is given in table 1. The temperature of polymorphic transformation 1020°C.

Table 1
The sampling location sampleMass fraction of elements, %
AlMoCrZrSnFeSiNbNAboutN
Top 7,070,690,0134,012,490,0510,171,16<0,0050,005is 0.1350,0054
Bottom6,940,70,012a 3.9to 2.570,040,141,140,0050,0040,1340,0053

The ingots were subjected to forging after heating up to 1180°C (160°C higher CCI) with deformation rate of 65% After which the billet was heated to a temperature of 1140°C (120°C above TPP) and was carried out by the deformation degree from 55% size 49×190×360 mm Further forged slab struck at the size 39×180×350 and cut into several pieces. The billet was heated to a set temperature of 1090°C (70°With higher CCI) and rolled for 2 passes with the degree of deformation in each pass, respectively, of 10.3% and 9.6% for a thickness of 32 mm, and then when reaching the total deformation for heating 18% tackle podogrevom the same set temperature. Then was carried out by rolling a 2 pass with degrees of deformation of 12.5% and 14.3% for a thickness of 24 mm, and when reaching the total deformation for heating 25%, re-fueled at the installation temperature. Then made rolling with deformation rate of 16% on the thickness of the rolled 19,5 mm total degree of deformation for the stage was 50%. To improve the surface quality of the workpiece, planning for a thickness of 15 mm Next billet was heated to a temperature of 990°C (30°C below CCI) and made rolling a 2 pass on the thickness of 11.5 mm, with degrees of deformation in each pass, respectively, 13% and 11.5%, after reaching the accumulated strain 24%, was carried out by further heating at the same temperature. Then was carried out by rolling a 2 pass to a thickness of 9 mm with degrees of deformation in each pass, respectively, 13% and 10% and, after reaching the accumulated strain 22%, was carried out by heating at the same temperature. Then the billet rolled for 2 passes to a thickness of 7 mm with a degree of deformation in the first and second pass respectively 11.5% and 12.5%, after reaching the accumulated strain of 22.2%, was carried out by heating at the same temperature. Then rolled billets in 2 pass at a thickness of 6 mm with the degree of deformation in the first pass of 9% and a degree of deformation of the second passage 8%, while the cumulative deformation during heating of the composition is silt 15%. After a heated billet rolled in two passes on the thickness of 5.2 mm with deformation rate of 7% in each pass and was carried out by heating at achieving the accumulated strain of 13.3%. Next produced rolling in two passes for a thickness of 4.5 mm with deformation rate of 7.7% in the first passage and the degree of deformation of 6.3% in the second passage. Then the rolled cut-to-length sheet, spent adjusting operation and collecting the bags, when this sheet was placed in the package so that the direction of the subsequent rolling was perpendicular to the previous direction of rolling. In the package was placed on sheet 3 of the workpiece, taking into account the upper and lower steel plates of a thickness of the package amounted to 40 mm, Then perform the final stage of rolling the batch method, for which the package was heated to a temperature of 980°C (40°C below CCI) and rolled for 1 pass at a thickness of 33 mm (degree of deformation 17%). Then was carried out by heating and rolling for 2 passes on the thickness of the package 27 mm (degree of deformation of the passages 9.1% and 10%, the total degree of deformation of 18.2%), after which the produced heating and rolling of the package for 2 passes on the thickness of the package 22 mm (degree of deformation along the aisles of 11.2% and 8.5%, the total degree of deformation of 18.5%), next was carried out by heating and rolling for 2 passes on the thickness of the package 18 mm (the degree of deformation of the aisles of 9.1% and 10%, the total is I deformation of 18.2%). Then did a two-pass rolling to a thickness of 15 mm (the degree of deformation of the aisles of 9.5% and 8%, the total degree of deformation of 16.7%, then produced heating and rolling for 2 passes to a thickness of 12 mm (degree of deformation of the passages 10% and 11.2%, the total degree of deformation of 20%). Then the preform was heated and rolled for 2 passes on the thickness of the package 10 mm (the degree of deformation of the aisles of 8.4% and 9.1%, and the total degree of deformation of 16.7%, produced heating and rolling for 2 passes on the thickness of the package 8.4 mm (degree of deformation of the passages 10% and 11.2%, the total degree of deformation of 20%). The total degree of deformation of the package for the stage was 79%. Then carried out the disassembly of packets, resulting in the obtained sheet sizes 1,0÷1,1×200÷210×650÷700 mm the obtained sheets were produced by adjusting the processing, cutting to final size, sampling and testing of mechanical properties and study patterns. The results of testing the mechanical properties of the sheets in the delivery and after the heat treatment conducted on the samples are given in table 2, images of the microstructure of the sheets is presented in figure 1. The surface quality of the sheet meets all the requirements of regulatory documents, cracks and delamination are not recorded.

A method of manufacturing thin sheets from an ingot pseudo-alpha titanium alloy, wherein implementing tlaut deformation of the ingot pseudo-alpha titanium alloy composition of Ti-6,5Al-2,5Sn-4Zr-1Nb-0,7Mo-0,15Si in the slab, machining slab, heating to a temperature of 120-200°C higher than the temperature of polymorphic transformation (CCI), the deformation from the total deformation rate of 40-80%, followed by heating to a temperature of 90-150°C above the chamber, the deformation from the total deformation rate of 30-60%, multipass rolling on the tackle with a total degree of deformation of 50-80% and the degree of deformation per pass, 10-20% and additional heating after reaching the degree of deformation of 10-30%, heating the strips to a temperature of 20-40°C lower chamber of Commerce and multi-pass rolling with a total degree of deformation of 10-30% and the degree of deformation per pass 5-20% with additional heating after reaching the degree of deformation of 10-30%, the Assembly of sheets in the package with the packing so that the direction of the sheets subsequent rolling was perpendicular to the direction of the leaves of the previous rolling, rolling package the finished size with heating to a temperature of at 20-120°C lower chamber of Commerce and multi-pass rolling with a total deformation of the package 50-85% and the degree of deformation per pass 5-15% with additional heating service after attaining the degree of deformation of 15-25%, the extraction of the obtained sheets from the package and their auxiliary processing.



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: sheet is made from pure titanium and contains titanium and unavoidable impurities. It features yield point of 215 MPa or higher, mead size d of the grain making 25 mcm of larger and 75 mcm or smaller, and hexagonal crystalline structure. Appropriate grains in hexagonal crystalline structure feature means Schmidt factors (SF) of twins 11-22 with rolling direction oriented along their axes. Means Schmidt factor (SF) and grain means size d satisfy the following relationship: 0.055≤[SF/√d]≤0.084. Heat exchanger plate comprises sheet of pure titanium and as integral component.

EFFECT: high ductility and strength, heat exchange plate with such sheet.

2 cl, 6 dwg, 3 tbl

FIELD: metallurgy.

SUBSTANCE: method to produce a blank of a blade of gas turbine engines (GTE) with ultra-fine grain structure from titanium alloys includes preliminary heating of the blank to temperature below temperature of polymorphous conversion and treatment by means of multiple intensive plastic deformation with changing of deformation directions in several cycles. Treatment is carried out under isothermic conditions at identical temperature of the blank and the punch. In each cycle deformation is carried out at temperature of alloy annealing according to stages, which include setting of the cylindrical blank in the closed punch, open setting with production of the blank in the form of a disc, flattening to the disc rib in the closed punch for production of the blank with the square section, its setting in the closed punch to the cylindrical blank. Number of treatment cycles is determined based on achievement of the extent of accumulated deformation of at least five. Then closed setting of the blank is carried out at the temperature of 50-100°C below the alloy annealing temperature, squeezing into the cylindrical blank, having two different diameters of cross section for a blade foot and airfoil, and flat stamping of the blade blank.

EFFECT: homogeneous ultra-fine grain structure is produced in a blade blank, providing for high physical and mechanical and operating properties of a blade.

2 dwg

FIELD: metallurgy.

SUBSTANCE: thermomechanical device includes a working member made in the form of one pre-deformed element or several pre-deformed and parallel and/or in-series connected elements from alloy based on titanium with shape memory effect. The working member is made in the form of a rod with working part of cylindrical or rectangular shape and fixing parts in the form of expansions on the rod ends, the sectional area of which is at least by five times more than the sectional area of its working part.

EFFECT: achieving maximum possible translational relative movements of the member at variation of its temperature at the temperature interval of reverse martensitic transformation of material.

6 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: proposed method comprises smelting of alloy, making slab, machining its surface, hot, warm, and cold rolling, sintering and ageing. Smelted is pseudo-beta-titanium alloy with aluminium content not higher than 5.0 wt % and molybdenum equivalent No eq. ≥ 12 wt %, calculated by the following formula: Mo eq. wt % = %Mo + %Ta/4 + %Nb/3.3 + %W/2 + %V/1.4 + %Cr/0.6 + +%Fe/0.5 + %Ni/0.8 + %Mn/0.6 + %Co/0.9. Semi-finished 8-2 mm-thick rolled stock produced in hot and cold rolling is subjected, prior to cold rolling, to quenching at Tpt+(20-50°C) for 0.1-0.5 h with cooling. Cold rolling is performed to sheet thickness of 6-1 mm in signal-phase beta-state in two and more steps in several passes with 1-6%-reduction in one pass and total reduction at every step of 30-50%. Note here that intermediate quenching is carried out between said steps in conditions identical to quenching of semi-finished rolled stock before cold rolling.

EFFECT: high-quality rolled thin sheets.

5 dwg, 2 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, particularly, to forming semis from titanium alloy BT6 and may be used in machine building, aircraft engineering and medicine. Proposed method comprises annealing at 850°C with holding for an hour in furnace to create globular (α+β)-structure and multipass rolling combined with affecting semis to pulsed electric current with density of 50-200 A/mm2, frequency of 830-1000 Hz, pulse duration of 100-120 ms to ensure total true strain degree of e>1 and to form nanocrystalline structure in semi. Note that, after every pass, semi is water cooled. Higher forming capacity of alloy is provided for.

EFFECT: higher strength at optimum ductility.

5 cl, 1 dwg, 1 tbl, 1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, particularly, to plastic deformation of metals, namely, to production of thin sheets from (α-β)-, pseudo-β, β-titanium alloys. Proposed method comprises preparing stack consisting of the main and clad layers for rolling, assembling said stack, welding, degassing, hot rolling of clad sheet, subsequent rolling and thermal treatment, and surface finishing. Said stack is assembled of the main layer composed of large-size blank from difficult-to-deform titanium alloy and two clad layers from unalloyed titanium used as temporary layers. Clad sheet is rolled in several passes at temperature above and below that of polymorphic transformation Tpt. Note here that after rolling said clad layers are removed in surface finishing.

EFFECT: production of thin high-surface-finish sheets from ((α-β)-)-, pseudo-β, β-titanium alloys.

2 dwg, 4 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: beta-titanium alloy with ultrafine-grained structure consists of beta-phase gains with mean size not exceeding 0.5 mcm, precipitations of secondary alpha-phase particles of spherical shape and mean size not exceeding 0.5 mcm and volume fraction in the structure making at least 40%. Proposed method comprises intensive plastic deformation and thermal treatment. Thermal treatment is carried out before deformation by heating to temperature exceeding that of polymorphic conversion by 5-15°C for, at least, one minute for 1 mm of diameter cross-section and quenching in water. Intensive plastic deformation is performed by equal-channel angular pressing with changing deformation direction through 90 degrees after every deformation cycle at (T"пп"-200…T"пп"-150)°C with total accumulated deformation e≥3.5 and subsequent quenching in water.

EFFECT: higher strength and fatigue characteristics of alloys.

2 cl, 1 tbl, 1 ex

FIELD: nanotechnologies.

SUBSTANCE: invention relates to the field of superconductivity and nanotechnologies, namely, to the method for production and processing of composite materials on the basis of high-temperature superconductors (HTSC), which may be used in devices of energy transmission, for development of current limiters, transformers, powerful magnetic systems. The method to process a high-temperature superconductor representing a composite structure made of a substrate material with applied buffer layers of metal oxides, a layer of a superconducting material of metal oxides, above which a protective layer of silver is applied, consists in radiation of the specified structure with an ion beam of heavy noble gases with energy from 48 to 107 MeV with a flux of 2×1010 - 5×1010 ion/cm2 and density of ion flux of 2.6×10-8 - 6.5×10-8 A/cm2 maintaining temperature from 30°C to 100°C, with provision of relief of internal elastic stresses in the composite structure.

EFFECT: improved characteristics.

3 dwg, 1 tbl

FIELD: metallurgy.

SUBSTANCE: invention is related to the treatment method of titanium-nickel alloys with nickel content of 49-51 at % with shape memory effect and reversible shape memory effect (versions). The above method involves thermomechanical treatment combining deformation and annealing after deformation in the temperature range of 350-500°C till the accumulated deformation degree of 25-40% annealing after deformation in the temperature range of 350-500°C is obtained; thermomechanical guiding of shape memory effect (SME) and reversible shape memory effect (RSME) the annealing after deformation is performed during 1.5-10 h, and guiding of SME and RSME is performed by means of loading of the alloy as per the bending pattern with deformation of 12-20% at temperature Ak -10 ≤ T ≤ Ak +10, exposure at that temperature during 0.25-5 minutes, cooling to the end temperature of martensitic transformation; after that, alloy is unloaded and thermally cycled in the temperature range of Ak to -196°C with exposures during 0.25-5 minutes. According to the second version of the method, after the deformation is completed, first, recrystallisation annealing is performed at the temperature of 700°C during 0.20-120 minutes, and then, annealing after deformation is performed.

EFFECT: improving functional properties of the alloy.

2 cl, 1 dwg, 3 ex

FIELD: metallurgy.

SUBSTANCE: unit for heat treatment and painting of multiple bent surgical needles includes the following: conveyor for transfer of needles from source of bent surgical needles to receiver, housing located near conveyor, where housing has the first end, the second end and the hole from the first to the second ends, heat source located inside the housing to heat multiple needles at their transfer by means of conveyor from the first end to the second end of the housing, and system for provision of gas mixture containing partial oxygen concentration for oxidation and painting of needle surfaces at their passage through the housing. Needle heat treatment and painting method involves the following: needle transfer from source of bent surgical needles to receiver, heating of needles to the temperature below recrystallisation temperature at their passage from source of bent surgical needles to receiver, provision of gas mixture containing partial oxygen concentration and needle surface painting during heating at their passage through gas mixture.

EFFECT: needles have painted surface, are characterised by increase in rigidity and plastic bending moment of bent surgical needles.

19 cl, 9 dwg, 4 ex

FIELD: process engineering.

SUBSTANCE: proposed reeler comprises stands with four driven rolls, adjustment devices mounted outside of stand and telescopic shafts. Note here that said reeler comprises central frame with said stands, first platform located at loading side to support replacement stands, second platform locating at unloading side, opposite said loading side, transverse drive to push replacement stands toward those to be replaced. Note also that said stands toward those to be replaced are transferred at second platform to mount replacement stands in central frame instead of stands to be replaced.

EFFECT: higher safety, ruled out manual jobs.

15 cl, 10 dwg

FIELD: process engineering.

SUBSTANCE: proposed reeler comprises stands with four driven rolls, adjustment devices mounted outside of stand and telescopic shafts. Note here that said reeler comprises central frame with said stands, first platform located at loading side to support replacement stands, second platform locating at unloading side, opposite said loading side, transverse drive to push replacement stands toward those to be replaced. Note also that said stands toward those to be replaced are transferred at second platform to mount replacement stands in central frame instead of stands to be replaced.

EFFECT: higher safety, ruled out manual jobs.

15 cl, 10 dwg

FIELD: process engineering.

SUBSTANCE: proposed measuring roll comprises, at least, one measuring bar resting on transducers built in roll outer surface. Note here that measuring bar is composed of strip tension measuring bar for determination of strip tension temporal process and extends, in fact, along circular contour in one preset zone of roll circular contour. In compliance with another version, said bar extends inclined to roll axis and extends on one side along one preset width zone and, on opposite side, along one preset zone of roll circular contour. Flatness measuring bar comprises, at least, one strip tension measuring bear as reference measuring bar. Note here that flatness measuring bar is used for measuring one voltage signal depending upon time and describing width coordinate. Note also that reference measuring bar is used to measure one reference time-dependent signal irrespective of width coordinate and describing strip temporal process. Note that reference signal is filtered from tension voltage signal for determination of strip intrinsic tension process.

EFFECT: higher accuracy of measurement.

7 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: proposed measuring roll comprises, at least, one measuring bar resting on transducers built in roll outer surface. Note here that measuring bar is composed of strip tension measuring bar for determination of strip tension temporal process and extends, in fact, along circular contour in one preset zone of roll circular contour. In compliance with another version, said bar extends inclined to roll axis and extends on one side along one preset width zone and, on opposite side, along one preset zone of roll circular contour. Flatness measuring bar comprises, at least, one strip tension measuring bear as reference measuring bar. Note here that flatness measuring bar is used for measuring one voltage signal depending upon time and describing width coordinate. Note also that reference measuring bar is used to measure one reference time-dependent signal irrespective of width coordinate and describing strip temporal process. Note that reference signal is filtered from tension voltage signal for determination of strip intrinsic tension process.

EFFECT: higher accuracy of measurement.

7 cl, 6 dwg

Universal joint // 2486978

FIELD: process engineering.

SUBSTANCE: invention relates to universal joints used for transmission of rotation at various angles from pinion stands or reduction gearboxes to mill stand working rolls. Universal joint comprises two split yokes consisting of interconnected base and cover with teeth in joint face and openings, trunnion with pins to articulated said yokes, and roller antifriction bearings. Transmitted torque is increased by fitting antifriction bearing rollers on trunnion pins while bearing bodies are fitted in yoke openings. Joint face of yokes is located at angle α to the pane perpendicular to universal joint lengthwise axis. Base teeth and cover of yokes are shaped to trapezoid with profile angle a. Note here that tooth side surface facing the universal joint center is parallel with its lengthwise axis while angle α equals 1.5ω where ω is misalignment angle in joint.

EFFECT: higher transmitted torque.

3 dwg

FIELD: process engineering.

SUBSTANCE: forming roll bearing seal comprises bearing assembly fitted on shaft journal and adapter with circular groove at its end, bearing cover with sealing gland seat. Said sealing gland comprises case, radial sponge with working edge interacting with adapter radial surface. Reliable contact with adapter surface in changing the position of roll rubbing surfaces relative to gland sponges is ensured by furnishing the gland with second radial sponge connected with case end face and interacting by its working edge with adapter groove inner radial surface. Said adapter has ledge interacting with extra sponge.

EFFECT: higher reliability of seal.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to application of reversing mill stand as a roughing or a finishing stand. Mill stand 20 has top and bottom support rolls 2, 4 engaged with appropriate top and bottom working roll 1, 3. Said rolls are replaced quickly and easily due to arrangement of top guide 8 at mill stand inlet and outlet to engage with working roll 1 and to be coupled via first actuator 6 with mill stand top zone. Top scraper 11 is engaged with top working roll 1 and displaced by second actuator 12 relative to said top working roll 1. Top guide 8 is retained in top and bottom vertical guides 9, 10 to be displaced therefrom by first actuator 6 from bottom vertical guide 9 and turned by third actuator 7 outward toward appropriate top working roll 1. Bottom scraper 13 is arranged at mill stand inlet and outlet to be rearranged by turn relative bottom working roll 3 effected by fourth actuator 14.

EFFECT: faster replacement of rolls.

11 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: tilting gear comprises housing, rocker, con-rod, retainer rolls, tilting and pressure rolls, nut drive motor and drive gear wheels. Note here that every drive rod acting on tilting and pressure rolls is furnished with thread to make ball-and-screw joint with nuts fitted in nut bodies to revolve therein. Note also that nut drive motors are fitted at nut bodies while said nuts ate made integral with gear wheels driven by aforesaid drive motor nuts.

EFFECT: higher efficiency, longer life.

1 dwg

FIELD: metallurgy.

SUBSTANCE: proposed method comprises smelting of alloy, making slab, machining its surface, hot, warm, and cold rolling, sintering and ageing. Smelted is pseudo-beta-titanium alloy with aluminium content not higher than 5.0 wt % and molybdenum equivalent No eq. ≥ 12 wt %, calculated by the following formula: Mo eq. wt % = %Mo + %Ta/4 + %Nb/3.3 + %W/2 + %V/1.4 + %Cr/0.6 + +%Fe/0.5 + %Ni/0.8 + %Mn/0.6 + %Co/0.9. Semi-finished 8-2 mm-thick rolled stock produced in hot and cold rolling is subjected, prior to cold rolling, to quenching at Tpt+(20-50°C) for 0.1-0.5 h with cooling. Cold rolling is performed to sheet thickness of 6-1 mm in signal-phase beta-state in two and more steps in several passes with 1-6%-reduction in one pass and total reduction at every step of 30-50%. Note here that intermediate quenching is carried out between said steps in conditions identical to quenching of semi-finished rolled stock before cold rolling.

EFFECT: high-quality rolled thin sheets.

5 dwg, 2 tbl

FIELD: test equipment.

SUBSTANCE: method includes production of images of scanned surface and their transfer into time rows of data. Structural analysis of the produced time row of data is carried out to determine location and coordinates of defect contours, using the specified value of the sliding interval moved along the produced time row of data. At the same time multiple n even breakdown is carried out into equal subintervals, and the sum of differences is identified between maximum and minimum values of data in analysed subintervals. By data on accumulated sums, parameters of regression equation are defined for specification of a dynamic variation index. Definition of defect coordinates is carried out by the moment of changing sign of the dynamic index of variation to the opposite one, which certifies local change of the surface structure. An index of fractal size of defect contour is calculated, and results are compared with values of a reference scale, including types of surface defects, their maximum permissible size and maximum permissible values of fractal size. If fractal size of a defect exceeds maximum permissible value, a conclusion is made on impossibility to eliminate the defect.

EFFECT: diagnostics of a surface structure based on calculation of a fractal size and a variation index with subsequent relation of a defect to a certain class.

1 dwg

FIELD: plastic working of metals, possibly manufacture of thin high-strength foil of titanium.

SUBSTANCE: method comprises steps of multi-pass reversing cold rolling and vacuum annealing; repeating cycle; using as initial blank titanium blank with ultra-fine grain structure provided due to intensified plastic deformation by equal-duct angular pressing process; rolling at pitch 15 - 8% for achieving total deformation 70 - 86 % per one cycle; setting number N of cycles necessary for making foil with thickness h according to mathematical expression; realizing vacuum annealing, preferably at temperature 350 -360 C for 0.5 - 1 h. Invention provides possibilities for making titanium foil with thickness up to 10 micrometers.

EFFECT: enhanced strength characteristics of titanium foil of lowered thickness with the same technological platicity7777.

2 cl, 2 tbl

Up!