Method of making foil from titanium-based intermetallide orthoalloys
FIELD: process engineering.
SUBSTANCE: proposed method comprises making ingots or powder billets. The latter are subjected to hot thermo mechanical machining, including sandwich rolling and finish cold rolling. Foil material mechanical properties are stabilised and material structure is blended in sandwich rolling at semi-finished rolled stock thickness of 2-4 mm with premade fine structure wherein grain width does not exceed 10 mcm while its length makes 40 mcm. Sandwich is composed of a set of semi-finished rolled billet and two steel covering plates. Note here that top covering plate thickness is 1.4-1.8 times larger than that of bottom plate. Hot rolling of sandwich is started from 950±50°C in several passes with total deformation of 70-90%. After annealing at 920±70°C and sandwich disassembly, cold rolling of every billet is performed at total deformation of 40-70% with intermediate vacuum annealing at 920±70°C.
EFFECT: higher foil quality made from titanium aluminide-based alloys based on Ti2AlNb orthorhombic phase.
2 cl, 4 dwg, 2 tbl
The invention relates to the field of metal forming, and in particular to methods of manufacturing foil cold rolling of alloys based on titanium aluminides (intermetallic titanium alloys), based on the orthorhombic phase of Ti2AlNb.
Currently, the most widespread manufacturer of foil industrial methods received the following technologies:
- rolling intermetallic billets produced from ingots or powder blanks;
- vacuum deposition of intermetallic alloys on a substrate with subsequent removal;
- vacuum process, in combination with the rolling of the deposited material.
Most high quality foil with stable properties is technology rolling, but for a foil thickness of 0.1 mm or less require additional electrolytic processing.
Known intermetallic compounds on the basis of Ti and Al, titanium aluminides (γ+α2-alloys)with high melting point, low density, high elastic moduli, oxidation resistance and fire, high strength/density and heat resistance. The scope of these compounds is extensive and includes: engine components, rocket nozzles, elements of a covering space vehicles, cell design sverhzvukovoy the x aircraft and the elements of their heat systems.
However, γ+α2the alloys have considerable disadvantages: low ductility at room temperature (hard deformiruem. during cold rolling), low viscosity, good enough fatigue properties, relatively high growth rate of cracks, possible porosity specific heat treatment.
More promising is a two-phase intermetallic alloy based on titanium with the addition of niobium, about or more than 25%, (ERCOSPLAN), for example an alloy based on Ti2AlNb, containing more ductile at room temperature β-phase, which includes an ordered orthorhombic crystal structure of ortho (O)-phase and three-centered cubic structure (BCC) phase of (β, or B2) and less plastic (alpha-2)-phase (α2). The alloy has a good combination of high temperature strength, sufficient ductility at room temperature and fracture toughness.
There is a method of rolling of billets from zaevtektoidnyh γ+α2-alloys, which relates to the handling of alloys based on titanium aluminides TiAl (γ-phase) and Ti3Al (α2-phase)obtained by casting or by powder metallurgy. The method involves rolling the original piece with a pre-prepared fine-grained structure on the sheet or foil with a predetermined thickness and grain size,which is carried out in a given interval of strain rates and temperatures for one or more stages, undertaken, in turn, for N passes in isothermal or kvazistaticheskikh conditions. The technical result of the invention to provide a sheet and foil with controlled structure and preparation of fine-grained microstructure in the initial preparations for implementing the method of rolling (RF patent No. 2164180, IPC B21B 3/00, C22F 1/18).
The disadvantages of this method are the limited size of the produced semi-finished product, the method inefficient, labour-intensive and adapted for the production of titanium aluminides.
A known method of manufacturing subjected to cold working of products from metal alloy (options). The invention relates to the manufacture of metal products, in particular, difficult intermetallic alloys. The product is made from iron aluminides, Nickel or titanium. When cold worked product is subjected to work hardening. Is rapid annealing aged less than one minute. Operation cold work and fast annealing may be repeated to obtain the required dimensions. The product can be obtained by casting, powder metallurgy or by plasma sputtering (RF patent 2245760, IPC B22F 3/24, C21D 7/02, C22F 1/18).
The method requires special equipment and does not guarantee the obtaining of products with stable mechanical properties homogenous structure.
A known method of manufacturing sheets of hard multicomponent alloys comprising melting the alloy, casting ingots, hot and cold rolling of ingots up to a given size of sheet and annealing, while the hot rolling of ingots produced with a surface oxide film in the case in crowded environments quenching and cold rolling are fractionally with advanced and intermediate Sakagami, while hot rolling and intermediate heat treatment before Sakagami produced in the temperature range below the melting point of the fusible component and higher than the temperature of dissolution of hardening phases. The method allows to obtain a wide range of products with stable mechanical and chemical properties consisting of multicomponent alloys belonging to the class of precipitation hardening and including a low-melting components (RF patent No. 2382685, IPC B21B 3/00) prototype.
This method cannot be applied in the manufacture of sheet products of intermetallic alloys, because it does not take into account the specificity of phase transformations during thermomechanical processing of intermetallic ortolano.
Task to be solved by the claimed invention is directed, is to obtain the standard equipment of high quality foil of the intermetallic arespl the great Patriotic war on the basis of titanium, in particular, based on the orthorhombic phase of Ti2AlNb used in aerospace systems.
The technical result of the invention to provide a method of manufacturing a foil thickness of 0.1 mm and less cold rolling, which allows you to get out of intermetallic ortolano quality foil with stable mechanical properties and a homogeneous structure.
The technical result is achieved in that in the method of manufacturing a foil of intermetallic of ortolano based on titanium., including the production of ingots or powder blanks, which are then subjected to hot thermomechanical processing, including batch rolling, and final cold rolling, batch rolling is carried out at a thickness of strips equal to 2-4 mm with pre-prepared fine-grained structure in which the width of the β-grains is not more than 10 μm, and the length is 40 μm, the package is formed by a set of billet steel and two steel plates, the thickness of the upper mantle 1.4-1.8 times more than the bottom, the hot rolling of a package made from the set heating temperature of 950±50°C for several passes with a total degree of deformation 70-90%, after annealing at a temperature of 920±70°C and disassembly of package cold rolling of each workpiece lead with a total degree of deformation of 40-70% with intermediate vacuum is passed by annealing at a temperature of 920±70°C.
The invention is illustrated by illustrations, where:
1 shows a foil thickness of 80 μm, the obtained alloy Ti-10,5Al-39,5Nb-1,2Zr-1,3V-0,7Mo-0,16Si (weight percent).
Figure 2 shows the microstructure of the steel after batch rolling.
Figure 3 shows the microstructure of the foil obtained for the two stages of cold rolling.
Figure 4 shows a scheme of the receipt foil of alloy Ti-10,5Al-39,5Nb-1,2Zr-1,3V-0,7Mo-0,16Si (weight percent).
Intermetallic compounds occupy an intermediate place between metals and ceramique types of chemical bonding, and properties. Included in the intermetallic artsplay compounds have a chemical bond as metal type, and with some degree of covalent component. So they have a much better machinability than ceramics. At elevated temperatures, there is disorder and ductility increases. This property allows for the fixation of high-temperature state to give the alloys a framework that allows us to expose them to cold rolling.
For cold rolling should:
- formation in these alloys before cold rolling of a homogeneous fine-grained equiaxial microstructure;
- the application of methods and modes of rolling, which would provide a uniform expansion in the procurement of plastic deformation was prepyatstvovali its localization.
Technologically structure similar material make suitable for cold rolling through recrystallization processes and phase transformations initiated during high-temperature plastic deformation due to the introduced into the material energy stress. The fineness and uniformity occurs after plastic deformation patterns vary along with the temperature and speed of formation primarily on the schema effort.
When the concentration of the deforming forces on a limited area of plastic deformation imposed by the material energy stress) on the periphery of the deformable products appear high secondary tensile stresses, which creates the conditions for propagation. The application of hot batch before rolling cold rolling to allow these technical contradictions, namely to obtain the desired structure before cold rolling, without destruction of the workpiece.
Tackle for batch rolling is performed by known methods thermomechanical hot, the thickness of the rolled 2-4 mm, provided that the alloy structure to form grain β-phase of a width not exceeding 10 μm and a length of not more than 40 μm. A batch is formed by rolling the alloy structure, allowing to carry out cold rolling of billets.
Batch rolling ASU is estlat in the package which is formed by a set of billet steel and two steel plates, the thickness of the upper mantle 1.4-1.8 times lower.
Applied the difference in the thickness of the plates provides additional shear strain. This asymmetry in the deformation zone aligns efforts in the hearth and is a stabilizing factor for sustainable process batch rolling and negates the possibility of the formation of local koralawella in titanium billets, practically excludes them joining in the presence between them of the separation layer.
Batch rolling is performed at the installation temperature of 950±50°C for several passes with a total degree of deformation of 70-90% with subsequent annealing at a temperature of 920±70°C. the Conditions of thermomechanical processing of selected empirically, when introduced into the workpiece thermomechanical energy allows you to get in the alloy of homogeneous fine-grained equiaxial microstructure prepared for cold rolling.
Then, the packet is parsed and further cold rolling of each workpiece for several stages with a total degree of deformation at each stage of 40-70% with intermediate vacuum annealing at a temperature of 920±70°C. the Deformation of less than 40% is not advantageous for economic reasons, with the deformation of more than 70% probably formed the e cracks. Annealing in the temperature range of 920±70°C is guaranteed to relieve work hardening and does not increase grain.
The proposed method provides the possibility of obtaining foil of thickness less than 0.1 mm of the intermetallic of ortolano titanium-based.
For assay of the present invention was used based alloy intermetallic Ti2AlNb. The chemical composition of the alloy is given in table 1.
|Ti %||Al, %||The content of alloying elements, % (weight percent)|
The ingot melting was melted double vacuum arc refining sizes Ø190×(200...250) mm Temperature of polymorphic transformation of the alloy determined by the method of trial sakaluk amounted to (990±5)°C. From multiple ingot forging in the β-region were fabricated slabs 40×440 is L mm, from which, by means of rolling in the β-region were made tackles thickness of 3.5±0.5 mm Then was cut into pieces for batch rolling size of 3.0×130×120 mm After polishing the workpiece been picked for batch rolling. In the package was put on 3 of the workpiece. Plates prepared from steel st3sp sizes:
- the top 14×200×200 mm,
- the bottom 10×200×200 mm
Welding packages was carried out on three sides, the rear end was left open.
Hot rolling (SE) packages from the installation of a heating temperature of 950°C was carried out on non-reversing two-high mill (roll diameter 500 mm) with a total degree of deformation of 75% to the thickness of the workpieces to 0.7 mm, Annealing was carried out in a conventional furnace at a temperature of 950°C, the duration of the annealing 20 minutes
Figure 2 is given metallographic image of the obtained sheet. In the structure (figa) observed the initial allocation, which are both globular and lamellar form. When this plate selection is oriented along the direction of deformation. The main share of the allocations has a globular shape with a size of about 0.5 to 1.0 microns.
According figb sample has a fine-grained structure with an average size of β-grains of 5 μm. The initial allocation, mainly situated on the frontiers. The actual boundaries are not straight, the shape of the grains ne is ka to equiaxial, that can be explained by the dynamic processes/postgenomics recrystallization occurring during hot deformation or during subsequent cooling.
After disassembly of the package and finishing operations billets were subjected to cold rolling according to the following scheme.
The first cold rolling hot rolled billets on Selivanova mill with a degree of deformation of 60% (CP 1).
Soothing heat treatment in a vacuum furnace at a temperature of 870°C.
The second cold rolling (CP 2) Selivanova mill with a degree of deformation of 60% on the final thickness of 80 μm.
Scheme for foil, including batch rolling and cold rolling, shown in figure 4.
The microstructure of the foil after the second cold rolling is presented in figure 3.
Cold deformation leads to a change in the shape of the grains of the β-phase, which continue to extend along the direction of rolling. Changes in the structure of the primary discharge is not detected. Secondary allocation O-phase partially reoriented in the direction of rolling. Next, the foil was subjected to different heat treatment regimes.
The mechanical properties of the foil thickness of 80 μm after different modes of heat treatment are presented in table 2.
|The mode of annealing in the vacuum||Mechanical properties|
|furnace||σin, MPa||δ, %|
|Heating at 750°C, exposure 2 h, cooled with oven||1200||0,5|
|Heating at 800°C, exposure 2 h, cooled with oven||1150||0,99|
|Heating at 900°C, exposure 2 h, cooled with oven||1100||1,5|
|Heating at 950°C, exposure 2 h, cooled with oven||1020||2,5|
The method allows to produce a foil made of alloys based on Ti2AlNb with low technological plasticity, in extremely cold deformation methods (rolling) to a thickness less than 0.1 mm
A method of manufacturing a foil of intermetallic of ortolano on the basis of titanium, including the production of ingots or powder blanks, hot thermomechanical processing, including batch rolling, and final cold rolling, characterized in that batch rolling conduct PR is the thickness of the strips, equal to 2-4 mm, with pre-prepared fine-grained structure in which the width of the β-grains is not more than 10 μm, and the length is 40 μm, the package is formed by a set of billet steel and two steel plates with the thickness of the upper mantle, 1.4-1.8 times thicker bottom, produce hot-rolling of the package from the installation of the heating temperature (950±50)°C for several passes with a total degree of deformation of 70-90%, annealing at a temperature (920±70)°C and disassembly of the package, and then cold rolling of each workpiece with a total degree of deformation 40-70% with intermediate vacuum annealing at a temperature (920±70)°C.
FIELD: process engineering.
SUBSTANCE: proposed device comprises moving plate and rack drive arranged between bed thrust surface and rolls assembly and rolls lifting mechanism. Rack drive rack is mounted on said plate joint with rack drive gear wheel on the mill drive side, while said rolls lifting mechanism is made up of two identical lifting support rolls fitted on eccentric shafts arranged on sides of drive and rolls assembly replacement. Working surfaces of lifting support rolls are arranged on plate bottom side while support roll is arranged above the plate on mill drive side. Clearance is created between support roll working surface and top surface of the plate in its lower position, its size being equal to rolls assembly lift magnitude. Note here that eccentric shaft of rolls lifting mechanism may be driven by worm gears fitted on one shaft.
EFFECT: ease of rolls assembly operation.
2 cl, 2 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Proposed regulator 7 comprises force regulator 8 and position regulator 9 inferior to the latter. In operation, rated rolling force F* and actual rolling force F are fed to force regulator 8. The latter is used to define correcting value δs1* for adjusting stroke proceeding from received aforesaid values. Said correcting value δs1* of adjusting stroke differing from δs1*, eccentricity compensation δs2* and actuator adjusting stroke actual value 2 are fed to position regulator 9 The latter defines adjusting parameter δq proceeding from received δs1*, δs2*, s. Parameter adjusting δq is used to vary adjusting stroke of actuator 6.
EFFECT: higher quality of rolled stock.
11 cl, 3 dwg
FIELD: process engineering.
SUBSTANCE: proposed method comprises stage-by-stage grinding of titanium billet grains by abc-forming and multi-pass rolling in grooved rolls with stepwise reduction in groove section at fixed temperature of billet heating for rolling. Increased mechanical properties are ensured by stepwise grain grinding at stepwise temperature reduction in the range of 750-500°C. In abc-forming, titanium billets made be subjected to recrystallisation annealing at 680-700°C for 1 h. Rolling in grooved rolls is performed at reducing billet temperature by 40-60°C at every pass to groove smaller section from 500°C to 300°C whereat rod final round cross-section is formed. The number of groove cross-sections id selected to provided for reduction not exceeding 40% in transition from one groove to another. Rolling is performed in several passes on turning the billet through 90 degrees about lengthwise axis. 4-8 mm-dia round titanium billets are produced to meet high purity standards.
EFFECT: higher metal yield.
6 cl, 2 tbl, 3 ex
SUBSTANCE: method to manufacture cold-deformed pipes from double-phase alloys based on titanium includes ingot smelting, ingot forging in a β-area or β- and α+β-area with forging completion in the α+β-area into an intermediate blank with the specified forging reduction. The intermediate blank is produced with forging reduction of at least 1.35, a block is made from the intermediate blank, which is pressed into a billet and thermally treated at the temperature that is by 30°-40°C below the temperature of Tint, and them the billet is rolled with intermediate surface treatment, etching and thermal treatment. Drawing in process of rolling is defined using the following formula.
EFFECT: produced pipes are characterised by high physical-mechanical properties due to exclusion of formation of grain-to-grain microcracks.
4 tbl, 1 ex
FIELD: process engineering.
SUBSTANCE: proposed device comprises, at least, one first reeler 1, 5 and one second reeler 20, and at least one reversing stand 8, 13 arranged between two said reelers 1, 5. It comprises also appropriate means 22, 23, 28 to transfer coils to and from coil transfer stations 24, 29. Besides it includes transverse transfer means 27 to transfer coils between said stations 24, 29, 30. Note here that, downstream of coil transfer station 24, 29, one common transfer means 25 is arranged to transfer coils to and from means 27.
EFFECT: higher efficiency of rolled coils transfer.
12 cl, 2 dwg
FIELD: process engineering.
SUBSTANCE: mill stand comprises forming rolls, bearings, through pads, dead pads and adjusting screws. Mill stand rigidity in direction perpendicular to rolling direction is ensured by providing said stand with bearing plates with rolled strip passages, holes for bolts to fasten roll pads and adjusting screw supports to said plates and vertical cutouts for roll pads to displace therein. Note here that roll dead pads are provided with hollow nuts to adjust roll axial displacement and accommodate bearing thrust assemblies to retain rolls in axial adjustment.
EFFECT: reduced torsion of rolled stock.
FIELD: process engineering.
SUBSTANCE: invention is intended for making high-strength rolled sheet from aluminium alloys. Proposed method comprises making flat billet and lengthwise cold rolling to target thickness. Note here that cold rolling is performed at -80 to -196°C with total reduction of 35-99%. After rolling to thickness exceeding target thickness by 2.8-9.5 times, billet is turned through 90 degrees in rolling plane.
EFFECT: higher strength and toughness.
2 cl, 1 tbl
FIELD: process engineering.
SUBSTANCE: rolls are arranged to de displaced axially by drives (4, 104, 204). Note here that the latter comprises, at least, one hydraulic cylinder (5, 6, 105, 106, 205) to control axial displacement of rolls. Proposed system comprises means (11, 12, 13, 14) to allow displacement of roll bearing holders (15, 16, 17, 18) perpendicular to axial direction A and in axial direction by rotary motion. Hydraulic cylinder is arranged in frame mounted spatially fixed or moving coupled with device elements.
EFFECT: simplified design.
2 cl, 3 dwg
FIELD: process engineering.
SUBSTANCE: proposed system serves to define parameters describing identity and/or in-service state of forming roll to be replaced and is provided with, at least, one sensor device fitted on said roll to memorise said parameters.Said device allows registration of parameters describing identity of forming roll being replaced. System incorporates also a reader to allow contactless reading of registered parameters from sensor device. Note here that said sensor device allows registration of data on forming roll state parameters and may be operated at forming roll temperature making at least 150°C. Besides, proposed system comprises cart for roll change. Note also that said sensor device will be arranged on replacement forming roll.
EFFECT: higher reliability.
14 cl, 5 dwg
FIELD: process engineering.
SUBSTANCE: proposed seal comprises cover and sealing V-like annular cuffs including case, jaw with working edges to get in contact with baffle and adapter fitted on bearing bush. Working edges are pressed against sealed surface by elastic properties of the jaws. Gaps resulting from wear of cuff working edges are ruled out by providing the proposed device with elastic ring elements with cross-section shaped to circle or ring fitted with interference between cuff case and jaw.
EFFECT: higher efficiency.
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
FIELD: rolling equipment, namely apparatuses for mounting rolls of working stands of rolling mills.
SUBSTANCE: apparatus includes screw-down cylinders connected with chocks of roll; liquid distributor communicated with pressure source and with screw-down cylinders; leverage mechanism joined with chocks of roll and with movable member of liquid distributor. The last is throttling one. Leverage mechanism includes rigid link, lever and doubled slide. First slide is mounted with possibility of horizontal motion relative to foundation of rolling mill; second slide is mounted with possibility of vertical motion relative to first slide. Rigid link is joined with chocks of roll and with second slide through articulation joint. First slide through lever is kinematically joined with movable member of liquid distributor. Rigid link is in the form of triangle. Leverage mechanism and screw-down cylinders are connected with chocks of upper or lower roll. First slide includes in addition controlled check valves of screw-down cylinders and system for controlling them. Invention provides possibility for redistributing pressure between screw-down cylinders in proportion to shift of leverage mechanism that is to automatically prevent skewing of roll.
EFFECT: automatic prevention of roll skewing, enhanced quality of rolled products, improved operational properties of roll.
6 cl, 2 dwg
FIELD: rolled stock production, namely equipment of shape bending mills, mainly for making tinned corrugated sheets.
SUBSTANCE: drive unit of shape bending mill with first guiding stand and pulling roller devices includes motor, reduction gear, sprockets, forcing and tensioning gear wheels, roller chain embracing sprockets along S-shaped curve and sine curve. Torque of motor is transmitted only to lower shaping rolls of even stands and of last stand of mill and also to both rolls of guiding stand and to horizontal rollers of pulling devices through sprockets mounted on their axles. Chain embraces sprockets of rolls of guiding stand and of rollers of pulling devices along S-shaped curve and it embraces sprockets of drive rolls and sprockets that are not joined with shaping rolls along sine curve. Axles of sprockets that are not joined with shaping rolls may be arranged higher than axles of lower drive rolls by value determined according to relation given in claims of invention.
EFFECT: lowered cost of shape bending mill, reduced power consumption for profiling, enhanced quality of ready shapes.
2 cl, 1 dwg, 1 ex
FIELD: automation of rolling processes.
SUBSTANCE: method comprises steps of measuring disturbance-stimulated strip thickness in front of rolling stand; controlling measurement result until inlet of stand; compensating it in stand by moving screws of screw-down mechanism at predetermined rate for preset time interval; measuring fluctuation of strip thickness relative to predetermined value when strip leaves stand; acting upon movement rate of screws according to disturbance and to fluctuation of strip thickness after multiplying said values and differentiating received product.
EFFECT: enhanced accuracy and reliability of controlling strip thickness.
FIELD: continuous rolling of strip, namely rolling strip having different thickness portions joined through transition wedge-shaped portion.
SUBSTANCE: method is used for rolling metallic strip 1 in rolling mill having at least two rolling stands. Metallic strip 1 has at least two zones 3,4 of different thickness mutually joined through wedge-shaped or approximately wedge-shaped transition portion 2. Rolling rate in rolling stand at rolling wedge-shaped portion 2 is tuned depending upon forward slip of rolling stand and also depending upon temperature of metallic strip 1. Apparatus for rolling includes rolling mill having at least two rolling stands providing tuning of rolling rate at rolling wedge -like or approximately wedge-like transition portion 2 of strip depending upon forward slip of rolling stand and upon temperature of metallic strip 1.
EFFECT: enhanced quality of rolled products.
2 cl, 5 dwg
FIELD: rolling equipment, namely transporting apparatuses, particularly roller table of rolling mill.
SUBSTANCE: roller table includes driven transporting rollers and lifting mechanism; lifting framework jointly mounted on struts and supporting transporting rollers; additional mechanism for lifting framework. Each mechanism for lifting framework is arranged in strut and it is in the form of sleeve, nut mounted inside said sleeve with possibility of motion and jointly connected through lug with framework; worm reduction gear joined with sleeve. In reduction gear and in sleeve there is opening in which screw is arranged. Said screw has cut splines in one end and in other end it has thread engaged with nut of sleeve. At least in one strut rotary crosspiece is jointly mounted. Lifting mechanism is mounted on said crosspiece.
EFFECT: enhanced operational efficiency of mill due to elimination of jamming movable links.
FIELD: automation of rolled stock production.
SUBSTANCE: at controlling thickness of tube wall in multi-stand continuous stretch-reducing mill, thickness of tube wall is measured behind mill by means of wall thickness measuring devices. Measured values are processed in computing unit. Revolution numbers of drive engines of rolls are controlled by means of units for controlling revolution number. In order to minimize formation of inner multi-arc profile at passing tube, total elongation value is kept constant due to changing revolution number of drive engines of rolls under control of computing unit.
EFFECT: enhanced quality of products.
5 cl, 4 dwg
FIELD: making of embossing on the commercial packing materials.
SUBSTANCE: the offered technology is dealt with making embossment on the flat materials and is used for packing of tobacco products. Rollers of the devices for making embossment, which are used for machining of the flat materials, including the firs driven roller and the conjugate roller are located in parallel to each other in a holder and may be placed so, that to enter into a definite mutual contact. At least one of the rollers for making embossment is located in a replaceable unit. At that the replaceable unit is supplied with retention tools. The holder contains pockets, the form of which is in essence complimentary for the retention tools so, that the replaceable unit may be entered in a predominantly defined position into the holder by insertion of the retention tools into corresponding pockets. The given technology provides more mild replacement of the rollers.
EFFECT: the invention ensures more mild replacement of the rollers.
20 cl, 16 dwg
FIELD: rolled stock production, namely apparatuses for mounting -dismounting bearing unit of backup roll of rolling stand.
SUBSTANCE: apparatus includes chock in which bearing assembly for roll journal is arranged. Apparatus that may be temporarily joined with bearing unit and may be axially moved in direction of backup roll and from it includes lever type inner and outer cams. Inner cams are introduced to end part of backup roll journal; outer cams are introduced to bearing unit. Inner and outer cams are mounted with possibility of rotation and locking by means of bayonet type lock in end part of journal and in bearing unit. End part of journal and intermediate ring screwed-on to bearing unit at its outer side are in the form of clover leaf having through grooves for inner and outer cams. Said cams after their rotation to clamp position may engage with respective locking protrusions of journal end part and of intermediate ring. In front of outer cams, pressure ring arranged before bearing assembly of journal is mounted.
EFFECT: lowered costs of changing bearing assemblies, increased useful life period and enlarged using range of apparatus.
5 cl, 3 dwg
FIELD: metallurgy, processes for making hot rolled band of magnesium alloy.
SUBSTANCE: method comprises steps of producing strip blank by continuous casting of melt of magnesium alloy; hot rolling of strip blank directly after casting at several passes for producing hot rolled band with thickness no more than 50 mm. Hot rolling is performed at initial temperature values 250°C - 500°C for providing final thickness of band no more than 4 mm. At first pass of hot rolling reduction degree is equal at least to 15%.
EFFECT: possibility for making magnesium sheets with improved deformation capability at less costs of manufacturing process.
11 cl, 1 dwg, 2 tbl, 1 ex