Method of making thin sheets from pseudo-beta-titanium alloys
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
The invention relates to the field of metal forming, and in particular to methods of manufacturing thin sheets by cold rolling of high strength pseudo-β-titanium alloys, which can be used in aerospace, chemical industry, mechanical engineering, medicine and other fields of national economy.
Cold rolling compared to hot has two big advantages. First, it allows the sheets and strips of a thickness of less than 1.0-0.8 mm up to several microns, which hot rolling unattainable. Secondly, it provides a higher quality production on all counts and dimensional accuracy, surface finish, physico-mechanical properties.
Titanium alloys are quite time-consuming when processing, so the cost of processing them is significantly higher in comparison with most other structural metals. In particular, most titanium alloys are difficult to deformation at room temperature, as a consequence, the industry's preference for hot deformation processing to produce semi-finished products, including sheet metal.
For example, a known method of manufacturing thin sheets of alloys mainly on the basis of titanium rolling in the package, including the preparation of the procurement, Assembly p is chum using steel case hot rolling package, heat package, the separation of the sheets, heat treatment, prokladku, editing and finishing the surface of the leaves, while the hot rolling of the package is carried out at thermal deformation parameters, implementing the scheme of deformation of a homogeneous compression of the material of the case and sheets thermoablative and ruled mostly in a vacuum furnace under conditions of creep (RF Patent No. 2179899, IPC B21B 1/38).
The process requires careful pre rigorous training, it is costly and inefficient compared to cold rolling. In addition, the implementation of technology in conditions of high temperatures in itself complicates the process and requires expensive heating equipment.
Known conditions under which it is possible to significantly improve the technological plasticity and reduce the deformation resistance of titanium alloys at room temperature to an acceptable level, allowing the cold rolling.
At almost the same content of impurities critical impact on the value of technological plasticity at room temperature have the following factors:
- high content of β-phase with the volume-centered cubic lattice, which is inherently more ductile than the hexagonal α-phase;
on gennoe aluminum content, because with the increase of its content in the alloy technological plasticity decreases, and when the content of more than 6% (by weight) Al technological plasticity of the alloys becomes insignificant.
These requirements under certain circumstances correspond to high-alloy pseudo-β-titanium alloys with low aluminum content and a high content of β-phase, which is fixed by quenching. These alloys in the hardened state have high plasticity and are capable of cold-formed.
However, in the final product to achieve high mechanical properties at high fracture toughness must be aging alloys. In the process of aging is dispersive decay of the β-phase with the formation at the grain boundaries of a thin layer of α-phase, which reduces the technological plasticity of the alloy and makes it impossible for the cold rolling of titanium alloys.
A known method of manufacturing sheets of the β-titanium alloy comprising machining the surface of the slab, hot, warm, cold rolling, annealing and aging (RF patent No. 2318913, IPC C22F 1/18, B21B 3/00).
The method does not provide receiving sheet of the pseudo-β-titanium alloys, as it does not guarantee the absence of α-phase in the cold rolling process and does not limit the critical content of aluminum in the titanium alloys, to the which can handle this method.
Task to be solved by the claimed invention is directed, is getting a quality sheet of semi-finished product made of high-strength pseudo-β-titanium alloys with thickness up to 1 mm or less with a high yield with minimal labor and energy costs.
Technical result achieved in the implementation of the invention is to obtain high-quality sheet metal, including sheet of high pseudo-β-titanium alloys by cold rolling, which is produced on the workpiece with the prepared single-phase β-alloy regulated when the content of aluminum.
The technical result is achieved in that in the method of manufacturing thin sheets of pseudo-β-titanium alloys, including alloy smelting, obtaining slab, mechanical surface treatment of the slab, hot, warm, cold rolling, annealing and aging, smelted pseudo-β-titanium alloy with an Al content in the alloy is not more than 5.0 wt.% and molybdenum equivalent Mo eq, % wt.≥12 wt.%, is calculated by the 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,
when this is received after the hot and the heat-rolled steel thickness 8-2 mm before cold rolling is subjected to tempering at TPP+(20-50°C) for 0.1 to 0.5 hours, followed by cooling, the cooler the rolling is conducted respectively to the thickness of the sheet 6-1 mm single-phase β-able in two or more stages in several passes with the degree of deformation in a single pass 1-6% and the total strain at each stage of 30-50%, thus between stages perform intermediate quenching mode, identical to the hardening of the tackle before cold rolling.
The method is applicable when rolling pseudo-β-titanium alloys, the composition of which corresponds to the following conditions:
1. Molybdenum equivalent (Mo eq.) must be at least 12 wt.%. This allows the process of hardening in the air sheet thickness up to 8 mm fixed metastable β-phase, and thus in subsequent operations are guaranteed to improve the technology of plasticity to an acceptable level.
2. The Al content should not exceed 5.0 wt.%, because the excess of this value reduces technological plasticity pseudo-β-titanium alloys to the level of making sheet cold rolling problematic.
The entire process chain, from processing of the ingot to the manufacture of rolled stock, based on known methods of hot and warm treatment, as they are the most technologically and economically viable and meet the requirements of today.
Before cold rolling is quenched steel at a temperature TPP+(20-50°C), the shutter speed is within 0.1 to 0.5 hours and then cooled, the time and temperature intervals during hardening selected from the following considerations:
- modes of quenching below the lower bounds do not guarantee the education structure, ostoja entirely of β-phase;
- exceeds upper bounds leads to the excessive growth of β-grains, which is inherited by the metal to the final product and leads to a significant reduction of the values of the mechanical properties of the alloy, particularly in the aged condition.
Tempering allows in alloys with Mo eq. ≥12 wt.% transfer 100% of the alloy structure in the single-phase β-state.
The aluminum content in the alloy should not exceed 5%because this value is critical, and its excess reduces technological plasticity to the level that impedes the carrying out cold rolling.
The ability of pseudo-β-titanium alloys, hardened in the metastable β-phase, to decay upon heating with the formation of the second phase provides an opportunity to apply a hardening heat treatment to obtain the required level of mechanical properties in the final product. To do so, before annealing and aging to enter into the material energy stresses sufficient to recrystallization processes.
Cold rolling is performed with degrees:
- the overall degree of deformation is in the range of 30-50% in one step, which is carried out in several passages;
strain in a single pass - 1-6%.
To preserve the single-phase β-States in the cold rolling process between stages produce intermediate quenching mode, identical to the first hardening p is data.
Deformation within the above does not allow to create a sufficient hardening of the material, sufficient to process a refund upon annealing for recrystallization mechanism.
Strain this creates prerequisites for the mechanical disintegration of the β-phase formation at the grain boundaries of α-phase and, as a consequence, reduction of technological plasticity and cracking during the rolling process.
The proposed method is tested under production conditions sheet rolling shop in the manufacture of sheets of pseudo-β-titanium alloy VST3553 thickness H=1,6 mm
The panels are manufactured from hot rolled billets pseudo-β-titanium alloy VST3553 thickness Ho=20 mm Chemical composition shown in table 1.
|The chemical composition of the alloy|
|Mass fraction of elements, %|
The temperature of polymorphic transformation TPPdetermined by the method of trial sakaluk, it amounted to 795°C.
Molybdenum equivalent was calculated by the formula
Mo eq.=%Mo++%V/1,4+%+Cr/0,6+%Fe/0,5=4,82+3,71+4,36+0,66=13,56 wt.%.
Manufacturing technology sheets with thickness of 1.6 mm
1. The heating of blanks in an electric furnace at a setpoint temperature of 750°C, duration : 30 minutes
2. Rolling of billets to a thickness of 5 mm: Hi=20→5 mm with intermediate heat treatment with a duration of 10 min at intermediate thicknesses of the strips 15 mm, 10 mm, the total degree of deformation ε=75%.
2. Hardening 820°C, 20 minutes, cooling in water.
3. The first stage of cold rolling Hi=5 mm→2.55 mm, ε=49%, for 10 passes.
4. The second stage of rolling Hi=2,55 mm→1.6 mm, ε=37%, for 7 passes.
5. Heat treatment: hardening+aging.
The invention is illustrated by photographs.
Figure 1 shows the microstructure of hot-rolled steel H=5 mm, the average transverse size of the β-grain is in the center of 180-230 μm, on the periphery of 150 μm, which demonstrates the heterogeneity of the deformation in the cross section of the sheet. The primary α-phase, mostly globular, size of 1-2 microns. It forms clusters of darker color that the army is there about the heterogeneity of strain.
Figure 2 shows the microstructure of hot-rolled steel H=5 mm after quenching, consisting of the equilibrium of recrystallized grains with an average size of 65±13 μm, consisting of β-phase.
Figure 3 shows the microstructure of cold-rolled sheet H=2,55 mm after the first stage of cold rolling of steel. There was a decrease in the average size of the β-grains to 45±3 μm with increasing degree of anisotropy to 2. In the body of the grains observed a large number of slip lines and doubles. In longitudinal section, viewed slip lines, passing through several grains.
Figure 4 shows the microstructure of the cold rolled sheet, H=1.6 mm after the second stage of cold rolling of steel. A decrease in the average transverse size of the original β-grain to the Dβ≈30-40 microns with anisotropy 3-4, as well as increasing the number and density of slip lines and clones.
Figure 5 shows the microstructure of cold-rolled sheet H=1.6 mm, quenching from a temperature of 815°C. after holding for 15 minutes and aging at 550°C, holding for 2 hours. Excerpt 15 minutes at a temperature of β-region provides a fine-grained recrystallized structure of β-phase with an average grain size of 55±3 μm. Subsequent aging leads to the decomposition of the supersaturated solid solution with the formation of melkopuzyrchatoy α-phase, leading to a considerable is rochani alloy.
The mechanical properties of the sheets h=1.6 mm alloy VST3553 after various modes of aging are shown in table 2.
|Mechanical properties of cold rolled sheets h=1.6 mm alloy VST3553 after various modes of aging|
|σof 0.2, MPa||σin, MPa||δ, %||σof 0.2, MPa||σin, MPa||δ, %|
|sheet # 4 - h=1.6 mm||742||823||14||772||818||8,6|
|815°C 15 min water||759||813||11,4||810||10,8|
|815°C 15 min water+530°C 6 hours air||1243||1322||3,4||1383||1438||1|
|815°C 15 min water+|
550°C for 6 hours in the air
|815°C 15 min water+|
580°C 6 hours air
This method allows to obtain the fine quality sheets of high-strength pseudo-β-titanium alloys with low anisotropy of mechanical properties on standard manufacturing equipment.
A method of manufacturing thin sheets of pseudo-β-titanium alloys, including alloy smelting, obtaining slab, mechanical surface treatment of the slab, hot, warm, cold rolling, annealing and aging, characterized in that smelted pseudo-β-titanium alloy with an Al content in the alloy is not more than 5.0 wt.% and molybdenum ek is Valenta Mo eq.≥12 wt.%,
calculated by the 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,
when this is received after the hot and warm rolling the rolled thickness 8-2 mm before cold rolling is subjected to tempering at TPP+(20-50°C) for 0.1-0.5 h and then cooled, the cold rolling is conducted respectively to the thickness of the sheet 6-1 mm single-phase β-able in two or more stages in several passes with the degree of deformation in a single pass 1-6% and the total degree of deformation at each stage of 30-50%, while between stages perform intermediate quenching mode, identical to the hardening of the tackle before cold rolling.
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
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
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
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
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
SUBSTANCE: method of thermomechanical treatment of workpieces from two-phase titanium alloys involves multi-stage severe plastic deformation with cumulative logarithmic deformation degree of not less than two and ageing. Severe plastic deformation of workpieces is performed with step-by-step temperature decrease at the interval of 0.99-0.3 of temperature of polymorphic transformation of alloy; at that, at the last stage of deformation the workpiece obtains the final shape. Prior to ageing the workpieces are heated up to temperature of 0.99-0.85 of temperature of polymorphic alloy transformation at the rate of not less than 50°C per minute and hardened.
EFFECT: increasing strength characteristics of two-phase titanium alloys and treatment process effectiveness.
3 cl, 1 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to metal forming and may be used in hot working of intermediate blanks of titanium alloys. Blank produced by hot working after ingot heating to some 100°C - 200°C above polymorphic conversion temperature to make square cross-section blank. Straining is performed after heating the blank to 20°C - 60°C below polymorphic conversion temperature. Then, blank is recrystallised by heating to 50°C - 100°C above polymorphic conversion temperature and face upsetting with 1.3-1.4 forging reduction followed by cooling in water. Final straining is performed in several passes with single forging reduction making 1.5-2.0 after heating the blank to 20°C - 60°C below polymorphic conversion temperature. Total forging reduction in final straining makes 5.0-6.0.
EFFECT: uniform specified structure, reduced costs, power savings.
1 ex, 1 tbl
SUBSTANCE: alloy containing titanium, 38-46 at % of aluminium and 5-10 at % of niobium and having the structure including composite plates containing alternatively formed B19-phase and β-phase at their volumetric ratio of 0.05:1 to 20:1, enveloped with plate-like structures of γ-TiAl type in quantity of more than 10 volume percents of the volume of the whole alloy; at that, plate-like structures of γ-TiAl type include α2-Ti3Al phase the quantity of which constitutes up to 20 volume percents of the volume of the whole alloy. Method for obtaining titanium-containing alloy involves provision of intermediate product with the alloy composition containing 38 to 46 at % of aluminium and 5 to 10 at % of niobium, and heat treatment of intermediate product by heating at temperature of above 900°C during more than sixty minutes and further cooling at the rate of more than 0.5°C per minute.
EFFECT: alloys are characterised with high strength and creep strength at high ductility and crack resistance.
20 cl, 4 dwg, 1 ex
SUBSTANCE: method for obtaining products of "blisk" structure from heat-resistant titanium alloys having blade and disc zones is proposed. Method involves treatment of initial workpiece by deformation in β-zone, cooling, deformation of blade zone in (α+β)-zone and heat treatment of the product. Deformation in β-zone is performed at temperature of T"пп"+(10-30)°C in a closed die by pressing of metal out of disc zone to blade zone with deformation degree of not less than 50% so that shaped workpiece is obtained. Deformation of blade zone in (α+β)-zone is performed with deformation degree of not less than 45%.
EFFECT: obtaining the product of blisk structure with high metal use coefficient; formation in disc zone of the product of plate-type recrystallised microstructure with size of β-grain of 50-150 mcm, and in blade zone - globular plate-type, which provide optimum level of mechanical properties.
2 cl, 1 dwg, 1 tbl, 4 ex
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.
FIELD: process engineering.
SUBSTANCE: proposed method is intended for adjusting parameters of cold rolling mill with several strip rolling stands 2 and strip feeder 3 mounted ahead of first mill stand 2-1. Efficient adjustment with advance factor allowed for is ensured by zero preset rpm (v-0*) is fed to strip feeder 3, strip is fed to first stand (2-1) is fed at first rpm (v-0) corresponding to zero preset rpm (v-0*), first preset rolls rpm (v-1*) is fed to said first stand (2-1), said rolls (7-1) run at first actual rpm (v-1). First thickness gage (4-1) is arranged between first and the next rolling stand (2-2) to measure strip actual thickness (d-1) to define, on the basis of the latter and first preset thickness (d-1*), the first main output signal to be used for make the first, but not the preset zero rpm (v-1*) so that first actual thickness (d-1) of cold strip (1) complies with the first preset thickness (d-1*) of cold strip (1). Zero device (4-0) is arranged between strip feeder 3 and first and (2-1) to measure actual zero thickness (d-0) of cold strip (1), then zero straight adjustment gage (9-0) is used to set preset zero rpm (v-0*) so that its product with zero actual thickness (d-0) is set to preset mass flow.
EFFECT: adjustment of rolling parameters.
14 cl, 4 dwg
FIELD: process engineering.
SUBSTANCE: invention is intended for increasing quality of sheets and ruling out pollution originating in forming special magnesium alloys doped with high-toxicity light-volatile elements that form, in heating and forming, harmful oxides, and may be used in production of sheets for anodes of electrochemical current sources. Proposed method comprises placing round ingot in tubular shell, hearing the workpiece and its hot and warm rolling to requited sheet thickness.
EFFECT: higher quality of sheets and process efficiency.
FIELD: process engineering.
SUBSTANCE: invention relates to metal forming, particularly, to tube feed and turn at cold rolling mills. Proposed method comprises feeding tube billet and rolled tube for required feed setting fulfillment increment and synchronous turn of billet and mandrel rod through equal preset angle of required turn setting fulfillment, and turning rolled tube and mandrel. Note here that rolled tube turn angle is smaller than preset of billet and mandrel rod required turn setting fulfillment angle.
EFFECT: minimised probability of mandrel screwing off its rod.
FIELD: process engineering.
SUBSTANCE: strip 2 in multi-stand mill passes sequentially through stands 1. Strip 2 is fed to every stand 1 with respect to central line of rolling with known adequate shift V of its head part and with known adequate inclination of said part SE at inlet side so that head part 8 gets out of stand 1 with appropriate shift V, head part inclination SA at outlet side and curvature K at outlet side. Wedge formation in the strip is ruled out by eliminating difference in stretching stresses between strip edges due to that fact that inclination SA at outlet side is defined from inclination SE on inlet side and reduction in stand 1. Strip head part curvature K at outlet side is defined from the results of appropriate measurements and other appropriate data. Appropriate curvature K of strip head part at outlet side is used to define appropriate control effect S for appropriate mill stand 1 and/or stand 1 immediately downstream thereof for control over said stand 1.
EFFECT: higher quality of rolled stock.
20 cl, 12 dwg
FIELD: process engineering.
SUBSTANCE: set off invention relates to rolling mill machinery, particularly, to truck 100 for transfer of drive spindle 200 of rolling mil roll 300 and to method of operating said truck. Flat truck incorporates running gear 105 to run under said drive spindle. Said truck is composed of lifting truck with first carrier 110 and first drive unit 120. First drive serves to lift first carrier under drive spindle and to down first drive, is required, along with said spindle relative to neutral position.
EFFECT: alternative design versions.
12 cl, 5 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy, particularly, to mill backup roll bearings. Proposed bearing comprises sleeve-journal mounted at forming roll pin taper section, sleeve-insert arranged between shaft pad and sleeve-journal, thrust bearing and annular hydraulic piston-cylinder unit composed of moving part and fixed part locked at roll pin cylindrical section whereat sleeve-journal may displace due to rigid coupling between moving part of annular unit and sleeve-journal or single-piece design.
EFFECT: longer life.
3 cl, 1 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Proposed drive comprises drive shaft and two gear wheels, two con-rods, two cranks hinged to con-rods and fitted on coaxial crankshafts with wheelwork each including crankshaft with gear wheel fitted thereon and, if required, countershafts locked axially and provided with engaged gear wheels meshed with crankshaft gear wheel, and counterweights fitted on crankshaft and/or countershaft. Closure of side clearances in gearing during stand reciprocation is ensured by providing the drive with extra shaft to engage similar gear wheels of two wheelworks by extra gear wheels fitted on said shaft. Note here that said extra shafts floats axially and is furnished with axial pressure mechanism engaged with housing. All gear wheels represent helical gears with opposite direction of teeth. Drive shaft is arranged parallel about axis of crankshafts while drive gears are fitted directly at drive shaft to engage with similar gear wheels of wheelwork.
EFFECT: new design.
6 cl, 7 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Rolling mill incorporates, at least, two rolls with shafts arranged so that first and second roll surface sections make tube rolling gage. Note here that said section is formed by groove at appropriate roll. Note also that groove cross-section in rotation plane has base and inlet. Besides inlet area of one roll groove inlet is located adjoin to similar are of another roll. Note that groove of first roll has section with first surface shape and second roll groove has that with surface second shape. Rolling mill has, at least, one revolving guide roll arranged at gage inlet or outlet. Better quality is ensured by making section of guide roll 10 formed by recess 13. Cross-section of said recess has sections with first and second shapes. Note also that section of first roll groove with first shape is partially lapped by section 14 of guide roll recess. Said section features first shape. Or, section of second roll groove with first shape is partially lapped be section 15 of guide roll recess of second shape.
EFFECT: higher quality of forming.
5 cl, 4 dwg
FIELD: process engineering.
SUBSTANCE: invention is intended for optimizing slab rolling in device comprising, at least, one furnace 2, at least, one slab processing device 3, 4 arranged in slab transfer direction F downstream of furnace 2, and, at least, one group 5 of rolling mill stands. Note here that said device incorporates appliances 6,7 to apply force to slab sides 8, 9 to make slab axis 10 shift across said direction F in compliance with axis 11 of aforesaid group 5. To optimise rolling by precise feed of slab 1 into group 5, first appliances 6 are used to apply lateral force thereto at first section 12 and by second appliances 7 at second section 13. Note here that said second section 13 in direction F is spaced from first section 12. Note also that first section 12 is located downstream, of furnace 2. Note that second section 12 is arranged upstream of, inside or downstream, of, at least, one processing device 3, 4. Proposed device comprises appropriate equipment.
EFFECT: optimised forming.
32 cl, 7 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