Method of rolling metal billet
FIELD: process engineering.
SUBSTANCE: invention relates to production of rolled stock and may be used in rolling of longsized billets including those with superplastic properties. Method of rolling between shaping rolls comprises selection of forming roll working surface shape by computer simulation at steadystate plastic yielding of metal in deformation zone with due allowance for superplasticity. Billet is formed at forming rolls with variation of forming rate at every stand owing to selection of forming roll working surface shape of next stand proceeding from optimum shape at previous stand. Note here that forming roll working surface shape is selected with due allowance for distribution of billet metal plastic yielding in deformation zone in directions perpendicular to rolling direction and plastic yielding rate in direction of rolling related therewith to be computed by mathematical relationship.
EFFECT: higher quality of finished product, power saving.
2 dwg
The invention relates to a method of production of steel and can be used when rolling long metal blanks between the rollers, including the manifestation of the workpiece material superplastic properties.
When rolling lengthy preparations, having a simple configuration in crosssection, long semifinished products with a more complex final crosssectional configuration, the workpiece is processed by a certain number of pairs of rolls in rolling mill). For each pair of such rolls, rolling stands, is part of the total deformation of the workpiece or tackle the crosssection for subsequent processing (rolling) to obtain the desired defectfree semifinished products. The most inefficient and timeconsuming operation in this technology is the choice of the profile of the deforming contour tool (rolls) on the first operation rolling.
The use of modern methods of computer simulation of the deformation process for interactive optimization of technological parameters and purpose of selecting the optimal geometry of the deforming tool should provide high quality products and to reduce the energy consumption for its production.
There is a method of die forging blanks in the state corplast is knosti, published article  Chumachenko, Sergeant G.A., Makarova LT, Solomatin B.C.  Definition of rational speed limits stamping under superplastic conditions. "Forging and Stamping Production, engineering, 1987, No. 3, 1617.
In accordance with the known method of die forging blanks in a state of superplasticity based on the analysis of the stressstrain state of the workpiece and power parameters of process of deformation modelling impose criteria functional relationship between changes in the velocity of deformation, the rate and degree of metal deformation in the deformation zone, the structural parameter and the degree of change efforts deformation. All criteria are linked functionally mathematical expressions, allowing, using stepbystep iteration, to carry out computer modeling, which allows to determine the changes of speed of deformation of the workpiece, which will enable superplastic flow of her material.
The disadvantages of this method are:
 impossibility to determine the velocity field of the flow of the metal of the workpiece in the direction perpendicular to the main plane of motion of the deforming tool and, thus, the inability to determine the optimal configuration de is armirujushchego tool through computer modeling in 3dimensional space of the deformation zone;
 used in similar mathematical method of compilation of the simulation algorithm cannot be applied to 3dimensional space of the deformation zone at the established stage of metal flow in the deformation zone.
The closest to the technical nature of the claimed invention is a method of rolling a metal workpiece between the rollers (J.J.Park, S.I.Oh " Application of three dimensional finite elements to shape rolling processes." Published in the journal  Transaction of the ASME J. Engg. Ind.  1990.  Vol.112.  FEBRUARY.  p.3646  "Application of 3dimensional finite elements in the simulation of rolling processes"). In this method, the determination of technological parameters defining the geometry of the working surface of the deforming tool, the distribution of stresses and velocities of the material in the deformation zone is carried out through computer simulation modeling of plastic flow of metal in the deformation zone, including:
 the choice of a computer program to simulate the configuration of the deforming contour of the tool and its optimization processing of the input data;
the choice of empirical configuration of the deforming contour of the rolls start rolling stands and putting it in the modeling and optimization;
 select and enter the program for the modeling and optimization algorithm, is defining the scope of the current deformation simulation step, the number of steps in the deformation zone and the precision parameter of the optimization emitting in the deformation of the two directions of the simulation along the direction of the rolling axis Z and perpendicular to the direction of rolling  plane XY;
input to a computer program algorithm that determines at each step of the modeling of the stress strain state of the environment in the form of functionality;
input to the simulation program algorithm in the scope of each simulation step and the total deformation zone, at first, the initial operation, the N  dimensional finite elements with properties of a solid plastic material and their reconstruction at each step of the simulation and optimization of the configuration of the working surface of the rolls, and including the modeling and optimization of the configuration of the working surface of the rolls on subsequent rolling of the workpiece to obtain the finished product, when used as the initial configuration of the mill roll, the optimal path obtained in the previous operation of the simulated rolling of the workpiece, with the possibility of changing the rolling speed through the changes in the geometric parameters of the deforming tool and dynamic parameters of the drive.
The disadvantages of this method of rolling process optimization to the hence, adaptation rolling tool roll through modeling should include:
low efficacy of simulation as applied to industrial processes due to a material increase in the cost of machine and operating time for the following reasons:
 large dimensionality of the system of the governing equations and, as a consequence, a large number of unknowns requires to get the result or enter additional assumptions required to achieve the desired result by reducing its accuracy, or significantly increased time adjustment 3dimensional finite element (TCE) at each simulation step in the whole volume of the deformation zone and processing tasks on each node TCA;
the assumption in the separation of the flow of the workpiece material in the deformation zone along two independent directions of the simulation so that the component of velocity of movement of any point of the metal in the deformation does not depend on its coordinates in the transverse direction, which will require additional processing time of the algorithm for matching the simulation results to the whole deformation zone.
The next disadvantage is the acceptance in the simulation the maximum value of friction in the deformation zone, which may lead to distortion of the results of optimization of the profile of the working surface of the mill roll.
When rolling in the deformation zone is the zone of contact of the metal with the surface of the rolls with significant relative slippage, i.e. a coefficient of friction less than 1.0. This area of the grip roller metal billet and the exit area of the metal billet from the deformation zone. The third zone located between these areas is the socalled neutral section, which has the effect of adhesion of the metal workpiece to the surface of the roll by equalizing the linear velocity of each point of the working profile of the mill roll and the rolled blank. Geometrical parameters and the location of the third zone of deformation relative to the center of rotation of the rolls well developed in the works of the rolling member. Ahicelebi, which shows the significance of the influence of geometrical parameters of the roll and the dynamics of his drive on the geometry of the neutral zone sections and control the distribution of velocities of the particles of metal in the deformation zone. The latter factors are not used in the analog prototype for modeling the optimal configuration of the deforming contour mill roll.
Technical problem on which the invention is directed, is the optimization of technological modes of deformation of providing a highquality semifinished product is the products view and reduction of energy consumption for its production through optimal geometry of the working profile mill roll each rolling stand.
The technical problem is solved in the method of rolling a metal workpiece between the profile rolls in consistently stand rolling mill, including the selection of a profile of the working surface of the rolls by means of simulation computer simulation at the steady state stage of plastic flow of metal in the deformation zone, taking into account the state of superplasticity, and the deformation of the workpiece in the forming rolls installed in series of rolling stands with a velocity change of deformation of the workpiece in each of the rolling stands by choosing the profile of the working surface of the roll subsequent rolling stands based on the optimal profile previous roll rolling stands. While the profile of the working surface of the mill roll is chosen taking into account the distribution of velocities (V_{x}V_{y})_{k}flow of the metal billet in the deformation zone in the direction perpendicular to the rolling direction and interconnected with these velocities velocity (V_{z})_{k}flow of the metal of the workpiece in the direction of rolling, which is calculated by the mathematical expression:
provided
where:
C_{k}, received the needful for the constant value of
where:
 ξ  low, front selectable number tending to zero, but not zero;
X, Y coordinates, perpendicular to the direction of rolling;
Z  coordinate coincides with the direction of rolling;
 K is the number of elementary volume ∆ _{k}that break volume deformation zone;
 ∈  means belonging Z elementary volume ∆ _{k}deformation zone;

 S  the current size poperechnov the crosssection of the workpiece relative to the elementary volume ∆ _{ k}deformation zone;
 G  side surface of the elementary volume ∆ _{k}deformation zone;
 2(tgα±η) is a multiplier that takes into account the friction at the boundary of metal
the workpiece  tool, where: η is the coefficient of the Coulomb law, and α is the contact angle of the metal workpiece with the tool for each elementary volume ∆ _{k}deformation zone;
 σ_{n} normal stress acting on the side surface G of the elementary volume ∆ _{k}deformation zone;
 σ_{z}the stress acting along the direction of the rolling axis Z, in the elementary volume ∆ _{k}the deformation zone, depending on the configuration of the side surface of the elementary volume ∆ _{k}the deformation zone, the magnitude of the accumulated therein hydrostatic pressure σ* and index of compressibility of the material of the workpiece;
 f_{k} term used as an amendment defined velocity (V_{z})_{k}particles of a particle ΔZ_{k}deformation zone relative to the speed of movement of particles of the metal billet in neutral cross section of the deformation zone, the step of determining the velocity, for each elementary volume ∆ _{k}the deformation zone, for each rolling mill stand is determined from the interval:
where Z_{B} the length of the deformation zone in the direction of rolling.
Drawings illustrating the invention:
 figure 1 shows a diagram of the deformation zone (spatial schema onequarter of the workpiece) for longitudinal rolling with a part of the working surface of the roll;
figure 2 shows a diagram of stress distribution on the surface of a particle ΔZ_{k}in the deformation zone.
The method is as follows.
When the simulation computer simulation of volume distribution in the deformation velocities of the particles of the metal billet deformation zone software is divided into two interrelated and orthogonal directions:
first direction in the plane XY perpendicular to the rolling direction is the Z axis, and having an elementary increment in the Z axis direction of thickness ΔZ_{k}forming an elementary volume ∆ _{k}the deformation zone, characterized by constant quasistatic over the metal of the workpiece corresponding to the viscous plastic medium, and in the plane of this direction through the software code, is meshed 2dimensional finite elements (DCE) for computer modelling of the distribution of velocities V_{x}V_{y}defined by the algorithm of courselemental approximation, and located in the deformation zone in the direction of rolling with Z_{k}relative to the center of rotation of the roll, projected on the Z axis as the origin, where k is the number of particle deformation zone;
the second  direction coinciding with the direction of the Z axis, the direction of rolling, which features relative speed of movement of the metal particles in the elementary volume ∆ _{k}the deformation zone is taken equal to a constant value, expressed analytically as functions.
A complete picture of the distribution in the amount of deformation relative velocities of the particles are deformable metal and voltage obtained after the computer integration of the stress strain States for each elementary volume ∆ _{k}distributed in the length of the deformation zone with a preselected step. The results are used to build the simulated configuration of the working profile of the rolls of each rolling stand.
Comparing the results of computer simulation with the requirements of the defectfree filling metal working profile rolls of each rolling mill stand, evaluate the optimality of the simulated circuit.
Where the requirements defectfree filling of simulated work profile rolling Valk is in each rolling mill stand metal workpiece, modeling the workflow configuration profile rolls of each rolling mill stand goes for a second simulation step when changing or empirically selected contour of the rolls, or the characteristic size of the rolls on the element of the path, or the speed setting of the drive rolls, or at the same time all these parameters.
When performing a defectfree filling of the metal billet simulated working profile rolls, contour accept optimally designed for this activity and consider the original circuit for simulation by the same algorithm subsequent operations rolling the workpiece to obtain the desired semifinished product output from the last stand.
Thus, without significant loss of precision calculations, setting one of the relative movements of the metal in the deformation zone in analytical form, receive a small number of unknown parameters, which reduces the resolving equations and allowing to reduce the solution volume problem to a sequence of solutions of generalized twodimensional problems.
For the sake of simplicity, the essence of the claimed invention, consider the solution of the problem on the example of longitudinal rolling of a metal strip (based on the symmetry seen a quarter of what ecene deformation zone of rolling strip  figure 1).
The problem of deformation in the deformation zone is solved in the velocities with the adoption of a number of assumptions:
 in forming the deformation zone is slow, quasistatic process, i.e. dynamic effects are neglected and the flow of the metal particles in the deformation zone is considered established when the time interval is divided into sub  intervals Δt, in which the change of speed of movement does not occur;
 consider an infinitely small elementary volume deformation zone  ΔZ_{k}at a distance of Z_{k}from the projection on the Zaxis coordinates of the center of the mill roll;
on the basis of semianalytical finite element method (FEM), for an elementary volume ∆ _{k}the value of the strain rate
where ∈ denotes the identity variable Z to the interval  [Z_{k}, Z_{k}+ΔZ_{k}].
Hence, the distance between the first point (x, y, z) of the deformation zone, at any time t, must be found the function V_{zk}(x, y, z, t), describing the rate of movement of material in an arbitrarily selected point. Thus, each end of the elementary volume ∆ _{k}crosssection of the deformation zone component of velocity of moving particles of material will be determined by the following functions:
V_{x}=V_{x}(x,y); V_{y}=V_{y}(x,y); V_{z}=C_{k}z.
Thus, spatial, threedimensional velocity field of a moving particle material in the deformation zone, including in the elementary volume ∆ _{k}crosssection of the deformation zone is divided into two field components:
(V_{x}V_{y})_{k} velocity field in the plane XY perpendicular to the Zaxis for each elementary volume ∆ _{k}the deformation zone, calculated according to the generalized flat, twodimensional problem using FEM or course element approximation;
(V_{z})_{k} velocity field along the Zaxis, calculated from the condition of minimization of the functional is calculated based on the equilibrium equations for each elementary volume ∆ _{k}the deformation zone at the appropriate time.
Considering the conditions of balance of all the forces acting in the direction of rolling at the elementary volume ∆ _{k}highlighted sections of Z_{k}and Z_{k}+dz, Paul is given the General expression for the functional
which is determined by computer simulation, for each kth elementary volume ∆ _{k}deformation zone with regard to the working profile mill roll obtained by k1 simulation step, is assumed constant, equivalent strain rate in the form 
σ_{n} normal stress acting on the side surface of the elementary volume ∆ _{k}the contour of the surface G (Fig 1)defined by the expression
where
K  coefficient of volumetric compression (constant material);
n_{x}and n_{y} direction cosines of the normal to the strip in the zone of contact with the rollers are determined for the kth step, the solution at the k1 step);
Δt  step solutions determined from (V_{z})_{k}Δt=ΔZ_{k}however, depending on the required accuracy of the simulation, the value of ΔZ_{k}choose from a ratio of
σ*  accumulated hydrostatic stress in the elementary volume ∆ _{k}the deformation zone, which is determined from the expression 
σ_{z}the stress acting along the Zaxis, perpendicular to the surface S of the elementary volume ∆ _{k} depends on the operating profile of the mill roll in the area of elementary volume ∆ _{k}and the amount of the accrued hydrostatic pressure σ* ∆ _{k}the deformation zone, defined by the equation:
2(tgα±η) is a multiplier that takes into account the friction η according to the Coulomb law on the border of the metal workpiece  tool and the angle α of the meta contact the La blanks with roller for each elementary volume ∆ _{ k}the deformation zone.
However, the use of the sign ±in relation to the longitudinal rolling due to meet emerging compressive stresses along the Zaxis near the input section of the deformation zone and tensile stresses near the output section of the hearth relatively neutral section in it.
At least the same module functionality outlined above and allows you to find the value (V_{z})_{k}for each elementary volume ∆ _{k}the deformation zone, is defined as
F(C_{k})≤ξ,
where
ξ is small, predetermined number tending to zero, but not zero, and to ensure the required accuracy of the solution when defining C_{k}in the process of computer modeling for optimization, for example, empirically selected deforming contour mill roll (tool).
Velocity field (V_{x}V_{y})_{k}determine, taking into account the initial and boundary conditions, the solution below presents differential equations:
where
δ_{ij}is the Kronecker symbol.
Coordinate placement Z* neutral section, with respect to rolling, the length of the deformation zone depends on the geometry of the deforming contour of the tool, the angle of the rolling contact of the roller with the rolled material for each elementary volume ∆ _{k}, the speed of rotation of the rolls and is determined from the expression
where
R is the radius of the roller;
H, h, respectively height of the car at the entrance and at the exit of the rolls;
After the obtained solution is functional in all kth elementary volume ∆ _{k}deformation zone pass to the determination of the velocities of the workpiece material across the deformation zone in on the managing rolling (V_{ z})_{k}.
Values of the velocity (V_{z})_{k}calculate for each elementary volume ∆ _{k}ratio
where: f_{k}(z)  velocity of a particle ΔZ_{k}in the deformation zone, defined by:
where:
k is the number of the crosssection of the deformation zone;
f_{0}the entrance velocity of the strip in the rolling mill rolls, determined by the speed of a neutral section in the deformation  Z*, the angular velocity of the rolls Ω and radius R by the expression
where m is the number of a particle crosssection, which is the neutral section with coordinate Z*;
Thus, make the determination of the velocity distribution throughout the volume of the deformation zone of the workpiece relative to the current operation. However, with respect to the longitudinal rolling, for the current solution relative to the current stand, the initial configuration of the deforming contour tool is the profile of the deforming contour of the tool received in the previous stand rolling mill.
In the implementation of computer simulation and optimization of the workflow configuration profile rolls on subsequent deformation of the workpiece as the initial configuration of the deforming contour tool use the optimal path, the floor is built on previous modeling operation rolling of the workpiece, with the possibility of changing the rolling speed by changing the geometric parameters of rolls and dynamic parameters of the drive.
Example of the effectiveness of the proposed method by computer simulation of the optimal configuration of the caliber of the deforming tool  rolls rolling mill in comparison with the method of computeraided design configuration same instrument based on 3dimensional finite element (TCE).
In the prototype presented a threedimensional model for computer simulation of rolling in calibers using threedimensional finite elements and using SHPROL. Using TCA of the program that set the configuration profile of the roll and, in the process of computer simulation of the rolling process, the strip, has traced the gradual deform as desired profile. The simulation was performed with the conditions of isothermal deformation.
The claimed invention were delivered similar numerical experiments (computer simulation) rolling in calibers using the software package SPLEN (Caliber), which applied the FEM method with twodimensional finite elements. Numerical experiments sang and danced with the same product as the authors of the article  prototype  band rectangular cross section of 50× 50,8 mm
Comparative numerical analysis was carried out as in smooth and profiled rolls. The material strip 45 is similar steel AISI  1045, which was used in the article of the prototype. The heating temperature for the simulation was set to 1100°C and temperature conditions of isothermal deformation.
In the calculations using SHPROL made, due to the axial symmetry of the cross section of the strip, on a quartersection, used the split model 640 spatial, threedimensional elements 1025 nodes. In this case, the calculations were done on the computer VAX11/750, to obtain solutions took 2600 iterations, which took about 175 hours of computing.
Numerical experiments on modeling the configuration of the rolls during rolling with SPLEN (Caliber) using the proposed method. It was selected one hundred sections of the deformation zone (k=1÷100) 352 final item in each section. The computation time on a Pentium 4 took about 100 minutes calculation Errors did not exceed 6...8%.
To obtain the normal stress distribution on the rolled strip in the calculations of the authors [2] required: 1000 TCE with 1476 nodes and 3200 iterations that resulted in 470 hours of computer VAX11/750 (powerful enough computer engineering).
Receipt of similar information in numerical experiments by the present method, using the program SPLEN (Caliber) to which the user's computer Pentium 4 took no more than 5 minutes The examples of computer equipment on the basic system requirements had almost the same performance.
The inventive method of rolling a metal workpiece between the rollers allows the optimization of technological modes of rolling with the provision of high quality semifinished products and to reduce the energy consumption for its production by selecting, using computer simulation, the optimal geometry of the working surface of the rolls of each rolling stand.
Method of rolling a metal workpiece between the profile rolls in consistently stand rolling mill, including the selection of a profile of the working surface of the rolls by means of simulation computer simulation at the steady state stage of plastic flow of metal in the deformation based on the status of superplasticity and deformation of the workpiece in the forming rolls installed in series of rolling stands with a velocity change of deformation of the workpiece in each of the rolling stands by choosing the profile of the working surface of the roll subsequent rolling stands on the basis of the optimum profile of the preceding rolling stand, wherein the profile of the working surface of the mill roll is chosen taking into account the distribution of velocities (V_{x}V_{y})sub>
kflow of the metal billet in the deformation zone in the direction perpendicular to the rolling direction and are correlated with these velocities velocity (V_{z})_{k}flow of the metal of the workpiece in the direction of rolling, which is calculated by the mathematical expression:
provided
where C_{k}is a constant equal to the speed of deformation in the direction of rolling for each elementary volume ∆ _{k}the deformation zone, which is determined by the minimum of mathematical expressions:
ξ is small, front selectable number tending to zero, but not zero;
X, Y  coordinates, perpendicular to the direction of rolling;
Z  coordinate coincides with the direction of rolling;
k is the number of elementary volumes (Δ_{
k}), which divide the amount of deformation;
∈ is the membership of Z elementary volume ∆ _{k}deformation zone;
S  currentsectional area of the workpiece relative to the particle deformation zone ΔZ_{k}mm^{2};
G  side surface of a particle deformation zone ΔZ_{k}mm^{2};
2(tgα±η) is a multiplier that takes into account the friction η according to the Coulomb law on the border of the metal billet  roll, the angle α is the angle of contact of the metal billet with a roller for each elementary volume deformation ΔZ_{k}, grad.;
σ_{n} normal stress acting on the side surface of a particle deformation zone ΔZ_{k}, MPa;
σ_{z}the stress acting along the direction of the rolling axis Z, in the elementary volume ∆ _{k}the deformation zone, depending on the configuration of the side surface of the elementary volume ∆ _{k}the deformation zone, the magnitude of the accumulated therein hydrostatic pressure σ* and index of compressibility of the material, MPa;
f_{k} term used as an amendment defined velocity (V_{z})_{k
particles of a particle deformation zone ΔZkrelative to the speed of movement of particles of the metal billet in neutral cross section of the deformation zone, mm/s;when this step of determining the velocity for each particle deformation zone ΔZkfor each rolling stand is determined from the interval$$10<\frac{{Z}_{B}}{\Delta {Z}_{k}}<\mathrm{300,}$$where ZBthe length of the deformation zone in the direction of the Zcoordinate, mm
}
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 21. Efficient adjustment with advance factor allowed for is ensured by zero preset rpm (v0*) is fed to strip feeder 3, strip is fed to first stand (21) is fed at first rpm (v0) corresponding to zero preset rpm (v0*), first preset rolls rpm (v1*) is fed to said first stand (21), said rolls (71) run at first actual rpm (v1). First thickness gage (41) is arranged between first and the next rolling stand (22) to measure strip actual thickness (d1) to define, on the basis of the latter and first preset thickness (d1*), the first main output signal to be used for make the first, but not the preset zero rpm (v1*) so that first actual thickness (d1) of cold strip (1) complies with the first preset thickness (d1*) of cold strip (1). Zero device (40) is arranged between strip feeder 3 and first and (21) to measure actual zero thickness (d0) of cold strip (1), then zero straight adjustment gage (90) is used to set preset zero rpm (v0*) so that its product with zero actual thickness (d0) is set to preset mass flow.
EFFECT: adjustment of rolling parameters.
14 cl, 4 dwg
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.
2 dwg
FIELD: process engineering.
SUBSTANCE: strip 2 in multistand 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: invention relates to metallurgy, particularly, to strip hot rolling at multistand mill 1. First section G1 of cogged ingot G is rolled to first thickness at outlet H3. Second section G2 of said ingot is rolled to second thickness H3' that differs from said first thickness H3. Transition from said first thickness to second thickness occurs at speed V_{0} of feeding ingot G to mill stand line 2 that is adjusted as the function of ingot speed V_{g} of leaving unit 6. Said unit 6 is located ahead of mill stand line 1 in direction of bulk flow and may be operated irrespective of other units located ahead of said line 2.
EFFECT: higher efficiency of rolling.
14 cl, 2 dwg, 1 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to rolling and is intended for automatic adjustment of mill stand speed in fettling strip in continuous sheet train. In steadystate rolling of previous strip, stand electric drive speed static drop is memorised while in rolling the next strip, drive speed is increased by magnitude of aforesaid drop at the moment of strip gripping be rolls of previous stand.
EFFECT: decreased probability of failures, higher precision of process parameters adjustment.
2 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to control over state (S1, S2, S3) of rolled material (G, GX), in particular, rough strip. Said state is defined by indications of wedging or camber of rolled material (G, GX). For this, rolled material (G, GX) is changed from initial state (S1) by rolling at roughing stand 1 and introducing strain (σ) to said material by means of extra machining means 7, 8, into intermediate state (S2). Note here that rolled material (G) is changed from intermediate state (S2) by means of, at least, one machining unit (A1, A2, A3,…AN) into final state (S3). Note here that, at this stage, defined is if rolled material (G, GX) is to be fed into said machining unit (A1, A2, A3,…, AN) intermediate state of which requires wedging or camber other than zero to ensure preset final state (S3'). This condition dully allowed for, duly intermediate state (S2) is set by control and/or adjustment of stand 1 and/or machining means 7, 8.
EFFECT: higher reliability and efficiency.
14 cl, 4 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to control over state (S1, S2, S3) of rolled material (G, GX), in particular, rough strip. Said state is defined by indications of wedging or camber of rolled material (G, GX). For this, rolled material (G, GX) is changed from initial state (S1) by rolling at roughing stand 1 and introducing strain (σ) to said material by means of extra machining means 7, 8, into intermediate state (S2). Note here that rolled material (G) is changed from intermediate state (S2) by means of, at least, one machining unit (A1, A2, A3,…AN) into final state (S3). Note here that, at this stage, defined is if rolled material (G, GX) is to be fed into said machining unit (A1, A2, A3,…, AN) intermediate state of which requires wedging or camber other than zero to ensure preset final state (S3'). This condition dully allowed for, duly intermediate state (S2) is set by control and/or adjustment of stand 1 and/or machining means 7, 8.
EFFECT: higher reliability and efficiency.
14 cl, 4 dwg
FIELD: metallurgy.
SUBSTANCE: metal strip head section 10 is rolled at rolling mill between top and bottom systems 2, 3 of rolling mill 1. Control over rolling comprises checking if tail section 11 of changeover station 12 located in direction of rolling (x) ahead of rolling mill 1. Ruling out of lateral microchipping of strip tail section is ensured by that, starting from the moment when tail section reaches changeover station, systems 2, 3 of rolls are bent by actuating mechanism 5 by force F that moves roll systems 2, 3 apart. Said force equals, at least, minimum force. Minimum force equals, at least, that of top roll system balancing. Said force is set subject to definite parameters of metal strip 4 rolling mil operating parameters.
EFFECT: higher quality of metal strip.
20 cl, 3 dwg
FIELD: metallurgy.
SUBSTANCE: proposed device comprises parallel lateral guide bars arranged on both sides of rolled strip driven separately by appropriate appliances across strip motion. It incorporates also regulator 14, 15, 16 to receive initial parameters of rolled strip guide including forces acting therein and/or positions of lateral guide bars and/or position of rolled strip, to adjust said forces and positions proceeding from measured initial parameters.
EFFECT: ruling out intermittent breakaway of rolled strip.
8 cl, 6 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: automation of rolling processes.
SUBSTANCE: method comprises steps of measuring disturbancestimulated strip thickness in front of rolling stand; controlling measurement result until inlet of stand; compensating it in stand by moving screws of screwdown 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.
2 dwg
FIELD: continuous rolling of strip, namely rolling strip having different thickness portions joined through transition wedgeshaped 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 wedgeshaped or approximately wedgeshaped transition portion 2. Rolling rate in rolling stand at rolling wedgeshaped 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 wedgelike 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: automation of rolled stock production.
SUBSTANCE: at controlling thickness of tube wall in multistand continuous stretchreducing 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 multiarc 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: rolled stock production.
SUBSTANCE: method of rolling metallic strip with use of skin pass stand comprises steps of reducing strip by thickness; adjusting speed Vi of strip at inlet of stand and speed Vo of strip at outlet of stand regardless of strip tension; setting relation of Vi/Vo equal to (1  E*) being relation of desired strip thickness at outlet of stand to strip thickness at inlet of stand, E*  preset value of strip elongation. Apparatus for rolling metallic strip includes skin pass rolling stand for reducing thickness of strip and setters for setting inlet and outlet speed values of strip for adjustment of speeds Vi and Vo regardless of strip tension.
EFFECT: enhanced quality of rolled strip.
8 cl, 3 dwg
FIELD: plastic working of metals.
SUBSTANCE: method comprises steps of calculating current value of coil diameter at coilinguncoiling process according to relation of revolution numbers of mill rolls and coiler; according to calculated value setting revolution number of motor of coiler and its electromagnetic parameters; at coiling counting turns of strip in coil simultaneously with calculation of current value of coil diameter; for each turn of coil storing diameter of coil calculated at such time moment; at next uncoiling of coil, counting turns in reverse direction; using stored value of coil diameter of respective turn for setting revolution number of coiler motor and its electromagnetic parameters.
EFFECT: enhanced accuracy of controlling tension of strip due to elimination of influence of reduction change in stand upon calculation accuracy of coil diameter at uncoiling strip.
FIELD: rolling.
SUBSTANCE: invention can be used in automation of hot and cold rolling mills. Method provides determination of parameters of elastic deformation of stand: modulus of rigidity of stand, correction factor for transfer from absolute rolltoroll clearance of stand to relative position in respect to roll pass design point, efforts on stand elastic deformation line corresponding to beginning of linear section and use of obtained parameters for refined determination of parameters of adjustment (rearrangement) of stand. Method of determination of parameters of stand elastic deformation line is combined with process of stand designing and it is implemented at step or continuous loading of stand rolls by roll compression force created by hydraulic pressure devices from minimum stand offloading force to designing force. Proposed method improves accuracy of adjustment (rearrangement) of rolling stand by rolltoroll clearance, decreases breaking of strips and increases yield of good strips by decreasing rejection of metal caused growback defect, reduces consumption of metal and work and support rolls owing to exclusion of additionally changing and regrinding of rolls in case of strip break in stand.
EFFECT: increased yield of strips.
3 cl, 4 tbl, 2 ex, 4 dwg
FIELD: rolling; sheet rolling processes.
SUBSTANCE: proposed method is based on measuring distribution of relative elongations of band longitudinal sections of strips detected by measuring device. According to invention, longitudinal band sections of strip chosen by measuring device adjoin each other without gaps and overlaps covering entire width of strip and strip tension is measured additionally. Relative overspeeding of metal in direction of strip movement in band longitudinal sections of strip singled out by measuring device relative to metal speed in one of band longitudinal sections of strip singled out by measuring device at minimum speed of metal are calculated using mathematical dependence. Relative overspeeds of metal in direction of strip movement in band longitudinal sections of strip singled out by measuring device, as compared with minimum speed of metal in one of band longitudinal sections of strip singled out using measuring device can be used to adjust profile of roll gap for producing strip of high planeness.
EFFECT: improved planeness of rolled strips owing to increased accuracy of measurement of nonuniformity of metal flow in process of rolling.
FIELD: processes for making rolled products such as simple and shaped sections, possibly in continuous rolling mills.
SUBSTANCE: method comprises steps of measuring (at rolling process) size of rolled strip along its length and detecting revolution number of rolls in stands; correcting preset interroll gaps and revolution numbers of rolls in stands; simulating parameters of rolling next strip on base of previous data of rolling mode of section; rolling next strip and simultaneously measuring its size and revolution number of rolls in stands; after finally setting interroll gaps and roll revolution numbers, evaluating specific consumption of electric energy in stand groups for reducing metal; according to set optimization algorithm, selecting optimal speed mode with minimum specific electric energy consumption.
EFFECT: minimized specific electric energy consumption, possibility for correcting sped mode at temperature fluctuation and at change of physical and mechanical properties of pieces to be rolled next from initial values.
3 dwg
FIELD: cold rolling in sixroll stand.
SUBSTANCE: in sixroll stand having pair of rolling rolls, pair of intermediate rolls and pair of backup rolls at least intermediate and rolling rolls engage with apparatuses for axial shifting. Barrel of each intermediate roll has length increased by shifting stroke and ground zone (x) near band edge at one side. According to invention upper intermediate roll is shifted in axial direction towards side As of drive unit and lower intermediate roll is shifted towards control side BS or vice versa. Said shifting is realized relative to neutral position (S_{zw} = 0 mm) of mean portion (yy) of stand symmetrically by the same value in direction of their axis (xx). Shifting position is set in different portions along width of band by means of piecewise characteristics on base of different positions of beginning of ground zone relative to band edge. Configurations of ground zone of roll barrels are normalized by means of mathematical relations.
EFFECT: enhanced accuracy of rolled product geometry.
3 cl, 4 dwg
FIELD: procedures for working coiled rolled strip after rolling it, namely loopfree aggregates for slitting rolled strips, particularly systems for controlling drive unit of circle shears of aggregate.
SUBSTANCE: method for controlling circle shears drive unit of aggregate for slitting coiled rolled strip including coiler, circle shears and uncoiler comprises steps of setting speed and torque moment of circle shears motor depending upon parameters of strip; at guiding strip to coiler (while cutting lead end of strip coil in front of coiler before tensioning it by means of coiler) measuring and storing moment of circle shears motor; after guiding strip to coiler and creating tension of strip by means of drive units of coiler and uncoiler setting revolution number of shears motor more than set speed of strip and setting moment of motor equal to value stored at guiding strip; at next process of cutting strip measuring real moment of circle shears motor and if it is less than of set moment value, lowering set value till measured real value. At cutting process also values of strip tension at side of coiler and uncoiler are measured for calculating their difference and storing its value at beginning of strip cutting with working speed. At each decrease of set moment value of motor depending upon measured real moment in case when said difference exceeds its stored value, increasing set moment of shears motor but no more than real moment value.
EFFECT: improved accuracy for setting moment of circle shears motor, enhanced quality of shearing rolled product.
2 cl