CN113102515A - Control method for residual strain in rolling process of titanium steel composite plate - Google Patents
Control method for residual strain in rolling process of titanium steel composite plate Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
Abstract
The invention discloses a control method of residual strain in a titanium steel composite plate rolling process, which belongs to the technical field of computer simulation of a heterogeneous metal composite plate rolling processing process. The invention can greatly reduce the production cost and has great practical value.
Description
Technical Field
The invention relates to the technical field of computer simulation of a rolling process of a heterogeneous metal composite plate, in particular to a method for controlling residual strain in the rolling process of a titanium steel composite plate.
Background
With the development of the times and the advancement of science and technology, metal materials are widely used in various fields. Metal material components are used in various severe complex environments, a single-material metal material cannot meet the requirements of people on material performance under various environments more and more, and metal composite plates are widely accepted by people due to the advantages of high cost performance, good comprehensive performance and strong adaptability to various complex environments, and people begin to use metal composite materials in large quantities. The titanium/steel composite plate not only has excellent corrosion resistance of titanium, but also has the obdurability and good weldability of steel. The titanium/steel composite board is widely applied to the fields of chemical engineering, energy storage, ocean engineering, ships and the like.
The titanium/steel composite plate is extremely complicated in the high-temperature rolling process, and the selection of rolling temperature, the selection of pass and reduction, the control of residual strain and the like are involved. In the rolling process, because the difference between the thermophysical properties of the base material and the composite material is large, metal flow deformation on two sides of an interface is not coordinated during rolling, so that certain residual strain exists near the interface, and the flatness and the interface bonding strength of the titanium/steel composite plate are influenced. In the subsequent forming and use of the plate, the excessive residual strain can cause the interface to generate fine cracks, thereby causing the deterioration of the interface performance. In actual production, the residual strain of the rolled composite plate can only be measured by adopting the traditional methods such as electromagnetic ultrasound, resistance strain rosetting and the like. But the method not only takes longer time, has great measurement difficulty and high cost.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a control method of residual strain in the rolling process of a titanium steel composite plate, wherein the rolling process of the titanium/steel composite plate is simulated on a computer, and the simulated result is solved and analyzed, so that a residual strain field of the rolled composite plate can be obtained; and the rolling process is optimized according to the residual strain data obtained by simulation, so that the method has important guiding significance for industrial production practice and improvement of the quality of the titanium/steel composite plate.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a control method of residual strain in the rolling process of a titanium steel composite plate comprises the steps of establishing physical models of a rolled blank, a roller and a push plate of the titanium steel composite plate, setting composite plate rolling parameters in a DEFORM pretreatment module of finite element analysis software, establishing a DEFORM finite element model in the rolling process of the titanium steel composite plate, analyzing simulation results after rolling is completed through a post-treatment module, obtaining data of the residual strain near a composite interface of the titanium steel composite plate under different rolling processes, and realizing prediction and control of the residual strain of the actually produced titanium steel composite plate.
The technical scheme of the invention is further improved as follows: the control method specifically comprises the following steps:
firstly, designing the shapes and sizes of a roller, a rolling blank and a push plate according to the actual rolling process; the rolling blank consists of a base plate and a clad plate, and the base material and the clad plate need to be respectively subjected to size design; then, establishing a two-dimensional model by using CAD (computer aided design) computer aided design software, and storing the two-dimensional model as a DXF (drawing exchange function) file;
step 2, establishing a finite element model in the rolling process:
importing the two-dimensional model DXF file constructed in the step 1 into DEFORM-2D, selecting a plane strain mode in program setting conditions, dividing a finite element grid by using a tetrahedral unit for a rolling blank, defining an object form as an elastoplastomer, and setting a roller and a push plate as rigid bodies; the rolling mode of the rolling blank adopts symmetrical rolling, the base plate is contacted with a roller, the clad plate is contacted and attached with the base plate, and the bottom surface of the clad plate is defined as a symmetrical surface;
the base plate of the rolled composite blank adopts a common carbon structural steel plate, and the clad plate adopts a titanium steel plate;
when the material library of DEFORM does not have material parameters corresponding to rolled blanks, the material performance parameters of the base plate and the clad plate are respectively calculated by JMATPRO software by acquiring the chemical components of a common carbon structural steel plate and industrial pure titanium TA2 and are stored as KEY files; importing the KEY file containing the material information into DEFORM software, constructing a material database of the rolling blank, and finishing the setting of the material attribute of the rolling blank;
step 4, setting the positioning and contact conditions of the object block:
setting the position relation of the substrate, the covering plate and the push plate by using commands such as offset, interference and the like in the object block positioning module, and ensuring that the object blocks do not interfere with each other; setting the contact relation among the base plate, the shroud plate and the push plate; setting the reduction distance of each pass of rolling, namely the offset distance of the roller along the thickness direction of the rolled blank, by utilizing interference conditions; calculating the total rolling reduction rate;
setting initial hot rolling temperatures of a rolled substrate and a clad plate in a general command module; setting strain rates of the substrate and the superstrate in a properties module; setting the rolling speed of the roller in the tool action module; controlling the relative motion of the push plate and the base plate and the relative motion of the push plate and the cover plate through the displacement-time relation; setting the upper surface of the substrate, the substrate and the surface of the covering side as heat exchange surfaces, and setting a heat exchange coefficient;
after the solution analysis of the creation operation, residual strain values in all directions near the interface of the titanium steel composite plate can be obtained in a post-processing module, and the optimal rolling process is optimized by comparing the residual strains of different rolling processes.
The technical scheme of the invention is further improved as follows: the contact relation among the base plate, the shroud plate and the push plate is that the base plate is in contact with the roller, the shroud plate is in contact joint with the base plate, the base plate is in contact joint with the push plate, and the shroud plate is in contact joint with the push plate by utilizing the interference condition; the friction type between the base plate and the roller, between the base plate and the clad plate, between the base plate and the push plate, and between the clad plate and the push plate is shear friction, and a shear friction coefficient is set; and setting a bonding and sewing condition at the composite interface to generate bonding points.
The technical scheme of the invention is further improved as follows: in step 3, the material performance parameters include, but are not limited to, young's modulus, thermal conductivity, heat capacity, poisson's ratio, and linear expansion coefficient.
The technical scheme of the invention is further improved as follows: in step 4, the rolling total reduction rate is the ratio of the total offset distance to the sum of the thickness of the initial substrate and the thickness of the initial shroud plate.
The technical scheme of the invention is further improved as follows: in step 4, the rolling total reduction rate is 84%.
The technical scheme of the invention is further improved as follows: in the step 5, the rolling temperature range is 800-900 ℃, and the strain rate is 1s-1The rolling speed was 1500 mm/s.
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. according to the method, the rolling process of the titanium/steel composite plate is simulated on a computer, and the simulated result is solved and analyzed, so that a residual strain field of the rolled composite plate can be obtained; and the rolling process is optimized according to the residual strain data obtained by simulation, so that the method has important guiding significance for industrial production practice and improvement of the quality of the titanium/steel composite plate.
2. The method can well simulate the rolling process of the composite plate under the condition that the technological parameters are accurately controlled, and the obtained residual strain data can better guide the actual industrial production, thereby realizing the optimal control of the residual strain after rolling.
3. The method can be used for replacing the actual rolling production process, can realize the prediction and control of the residual strain of the actually produced titanium steel composite plate, can save a large amount of production time and cost, and has higher practical value.
Drawings
FIG. 1 is a schematic diagram of a physical model of a titanium steel composite plate according to the present invention;
FIG. 2 is a schematic representation of the surface characteristics of a titanium steel composite plate model according to the present invention;
FIG. 3 is a schematic model diagram of a titanium steel composite plate after the meshing is finished;
FIG. 4 is a graph showing the variation law of residual strain at two sides of the interface of the rolling simulation titanium/steel composite plate in the embodiment 1 of the invention;
FIG. 5 is a graph showing the variation law of residual strain at two sides of the interface of the rolling simulation titanium/steel composite plate in the embodiment 2 of the invention;
FIG. 6 is a graph showing the variation law of residual strain at two sides of the interface of the rolling simulation titanium/steel composite plate in the embodiment 3 of the invention;
the composite surface comprises a roller 1, a roller 2, a base plate 3, a push plate 4, a covering plate 5, a composite interface 6 and a symmetrical surface.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
the embodiments of the present invention are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments.
Deform is a set of simulation software specially used for metal plastic forming finite element simulation, the rolling process of a titanium/steel composite plate is simulated on a computer, and the simulated result is solved and analyzed, so that the residual stress field of the rolled composite plate can be obtained. And optimizing the rolling process according to the residual stress data obtained by simulation. The method has important guiding significance for industrial production practice and improvement of the quality of the titanium/steel composite plate.
Example 1
As shown in fig. 1-4, a method for controlling residual strain in a titanium steel composite plate rolling process is sequentially performed according to the following steps:
firstly, designing the shapes and sizes of a roller 1, a blank and a push plate 3 according to the actual rolling process; the rolling blank consists of a base plate 2 and a cover plate 4, and the sizes of the base plate 2 and the cover plate 4 are respectively set according to actual factory production; then, establishing a two-dimensional model by using CAD (computer aided design) computer aided design software, and storing the two-dimensional model as a DXF (drawing exchange function) file; wherein, the size of the base plate 2 is 150mm multiplied by 15mm, the size of the cover plate 4 is 150mm multiplied by 10mm, the diameter of the roller 1 is phi 750mm, and the size of the push plate 3 is 35mm long multiplied by 10mm wide.
Step 2, establishing a finite element model in the rolling process:
importing the constructed two-dimensional model DXF file into DEFORM-2D, selecting a plane strain mode in program setting conditions, and dividing finite element grids by using tetrahedral units for rolling blanks; the number 1599 of the divided substrate 2 nodes, and the total elements 1464. Number of substrate nodes 1107 of superstrate 4, total element 976; here, in order to facilitate simulation of the distribution of the residual strain, the object form is defined as an elastoplastic body, and the roll 1 and the push plate 3 are both set as rigid bodies; meanwhile, the blank is rolled symmetrically, the base plate steel plate 2 is in contact with the roller 1, the clad plate titanium plate 4 is in contact with the base plate steel plate 2, the lower rolling surface of the clad plate titanium plate 4 is defined as a symmetric surface 6, and at the moment, the blank is rolled on the interface to be 25mm thick.
the base plate 2 of the rolled stock was made of 12Cr2Mo1R low alloy container steel, and the clad plate 4 was made of commercial pure titanium TA 2. Because the material library of the DEFORM does not have material parameters corresponding to the substrate 2 and the clad plate 4, the JMATPRO software can be used for respectively calculating material performance parameters such as Young modulus, thermal conductivity, heat capacity, Poisson's ratio, linear expansion coefficient and the like of the substrate 2 and the clad plate 4 through chemical components of a low-alloy steel plate and a titanium plate, and the material performance parameters are stored as a KEY file; and importing the KEY file containing the material information into DEFORM software, constructing a material database of the rolled blank, and finishing the setting of the material attribute of the blank.
And 4, setting the positioning and contact conditions of the object block:
in the object block positioning module, the position relations of the base plate 2, the cover plate 4 and the push plate 3 are set by using modes of deviation, interference and the like, so that the object blocks are ensured not to interfere; and setting the contact relation among the base plate 2, the cover plate 4 and the push plate 3, wherein the base plate 2 is in contact with the roller 1, the cover plate 4 is in contact with the base plate 2, the base plate 2 is in contact with the push plate 3, and the cover plate 4 is in contact with the push plate 3. The friction type between the base plate 2 and the roller 1, between the base plate 2 and the clad plate 4, between the base plate 2 and the push plate 3, and between the clad plate 4 and the push plate 3 is shear friction, the friction coefficient between the base plate 2 and the roller 1 is 1.20, the friction coefficient between the base plate 2 and the clad plate 4 is 1.20, and the friction coefficient between the push plate 3 and the blank is 0.08; meanwhile, in order to avoid dislocation of the base plate 2 and the cover plate 4 during rolling, bonding and sewing conditions need to be set on the interface; the contact between the roller 1 and the outer surface of the blank is set by utilizing interference conditions, the offset distance of the roller 1 along the thickness direction is equal to the reduction distance of each pass of rolling, the thickness of each pass of the rolled blank is changed to 25-20-15.5-12-9-7-5.5-4.5-4mm, and the total reduction rate of rolling is 84%.
the initial temperature of the rolled stock was set at 800 ℃ and the strain rate of the base plate 2 and the skin plate 4 was set at 1s in the property module-1Setting the rolling speed of the roller 1 to be 1500mm/s and the movement speed of the push plate 3 to be 300mm/s in the tool action module; controlling the relative motion between the push plate 3 and the base plate 2 and between the push plate 3 and the shroud plate 4 through the displacement-time relation; the upper surface of the base plate 2, the side surfaces of the base plate 2 and the cover plate 4 are set as heat exchange surfaces, and the coefficient of heat exchange is set to be 20 Kw/(m)2·℃)。
after the solution analysis and post-processing of the creation operation, residual strain values in all directions near the interface of the titanium/steel composite plate can be obtained, as shown in fig. 4.
Example 2
As shown in fig. 1-3 and 5, a method for controlling residual strain in a titanium steel composite plate rolling process is sequentially performed according to the following steps:
firstly, designing the shapes and sizes of a roller 1, a blank and a push plate 3 according to the actual rolling process; the rolling blank consists of a base plate 2 and a cover plate 4, and the sizes of the base plate 2 and the cover plate 4 are respectively set according to actual factory production; then, establishing a two-dimensional model by using CAD (computer aided design) computer aided design software, and storing the two-dimensional model as a DXF (drawing exchange function) file; wherein, the size of the base plate 2 is 150mm multiplied by 15mm, the size of the cover plate 4 is 150mm multiplied by 10mm, the diameter of the roller 1 is phi 750mm, and the size of the push plate 3 is 35mm long multiplied by 10mm wide.
Step 2, establishing a finite element model in the rolling process:
importing the constructed two-dimensional model DXF file into DEFORM-2D, selecting a plane strain mode in program setting conditions, and dividing finite element grids by using tetrahedral units for rolling blanks; the number 1599 of the divided nodes of the substrate 2 and the total elements 1464; number of substrate nodes 1107 of superstrate 4, total element 976; here, in order to facilitate simulation of the distribution of the residual strain, the object form is defined as an elastoplastic body, and both the roll 1 and the push plate 3 are set as rigid bodies; meanwhile, the blank is rolled symmetrically, the base plate steel plate 2 is in contact with the roller 1, the clad plate titanium plate 4 is in contact with the base plate steel plate 2, the lower rolling surface of the clad plate titanium plate 4 is defined as a symmetrical surface, and the thickness of the blank rolled on the interface is 25 mm.
the base plate 2 of the rolled blank adopts 12Cr2Mo1R low-alloy container steel, and the clad plate 4 adopts industrial pure titanium TA 2; because the material library of the DEFORM does not have material parameters corresponding to the substrate 2 and the clad plate 4, the JMATPRO software can be used for respectively calculating material performance parameters such as Young modulus, thermal conductivity, heat capacity, Poisson's ratio, linear expansion coefficient and the like of the substrate 2 and the clad plate 4 through chemical components of a low-alloy steel plate and a titanium plate, and the material performance parameters are stored as a KEY file; and importing the KEY file containing the material information into DEFORM software, constructing a material database of the rolled blank, and finishing the setting of the material attribute of the blank.
And 4, setting the positioning and contact conditions of the object block:
in the object block positioning module, the position relations of the substrate 2, the shroud plate 4 and the push plate 3 are set by using modes of deviation, interference and the like, so that the object blocks are ensured not to interfere with each other. Setting the contact relation among the base plate 2, the shroud plate 4 and the push plate 3, wherein the base plate 2 is set to be in contact with the roller 1 by utilizing the interference condition, the shroud plate 4 is in contact joint with the base plate 2, the base plate 2 is in contact joint with the push plate 3, and the shroud plate 4 is in contact joint with the push plate 3; the friction type between the base plate 2 and the roller 1, between the base plate 2 and the clad plate 4, between the base plate 2 and the push plate 3, and between the clad plate 4 and the push plate 3 is shear friction, the friction coefficient between the base plate 2 and the roller 1 is 1.20, the friction coefficient between the base plate 2 and the clad plate 4 is 1.20, and the friction coefficient between the push plate 3 and the blank is 0.08; meanwhile, in order to avoid the dislocation of the base plate 2 and the cover plate 4 during rolling, the bonding and sewing conditions are set at the interface. The contact between the roller 1 and the outer surface of the blank is set by utilizing interference conditions, the offset distance of the roller 1 along the thickness direction is equal to the reduction distance of each pass of rolling, the thickness of each pass of the rolled blank is changed to 25-20-15.5-12-9-7-5.5-4.5-4mm, and the total reduction rate of rolling is 84%.
the initial temperature of the rolled billet is set at 850 ℃, and the strain rate of the base plate 2 and the cover plate 4 is set at 1s in the property module-1Setting the rolling speed of a roller 1 to be 1500mm/s and the movement speed of a push plate to be 300mm/s in a tool action module; the relative motion between the push plate 3 and the base plate 2 and between the push plate 3 and the cover plate 4 is controlled by a displacement-time relationship. The upper surface of the base plate 2, the side surfaces of the base plate 2 and the cover plate 4 are set as heat exchange surfaces, and the heat exchange coefficient is set to be 20 Kw/(m)2·℃)。
after the solution analysis and post-processing of the creation operation, residual strain values in all directions near the interface of the titanium/steel composite plate can be obtained, as shown in fig. 5.
Example 3
As shown in fig. 1-3 and 6, a method for controlling residual strain in a titanium steel composite plate rolling process is sequentially performed according to the following steps:
firstly, designing the shapes and sizes of a roller 1, a blank and a push plate 3 according to the actual rolling process; the rolling blank consists of a base plate 2 and a cover plate 4, and the sizes of the base plate 2 and the cover plate 4 are respectively set according to actual factory production; then, establishing a two-dimensional model by using CAD (computer aided design) computer aided design software, and storing the two-dimensional model as a DXF (drawing exchange function) file; wherein, the size of the base plate 2 is 150mm multiplied by 15mm, the size of the cover plate 4 is 150mm multiplied by 10mm, the diameter of the roller 1 is phi 750mm, and the size of the push plate 3 is 35mm long multiplied by 10mm wide.
Step 2, establishing a finite element model in the rolling process:
importing the constructed two-dimensional model DXF file into DEFORM-2D, selecting a plane strain mode in program setting conditions, and dividing finite element grids by using tetrahedral units for rolling blanks; the number 1599 of the divided nodes of the substrate 2 and the total elements 1464; number of substrate nodes 1107 of superstrate 4, total element 976; here, in order to facilitate simulation of the distribution of the residual strain, the object form is defined as an elastoplastic body, and both the roll 1 and the push plate 3 are set as rigid bodies; meanwhile, the blank is rolled symmetrically, the base plate steel plate 2 is in contact with the roller 1, the clad plate titanium plate 4 is in contact with the base plate steel plate 2, the lower rolling surface of the clad plate titanium plate 4 is defined as a symmetrical surface, and the thickness of the blank rolled on the interface is 25 mm.
the base plate 2 of the rolled stock was made of 12Cr2Mo1R low alloy container steel, and the clad plate 4 was made of commercial pure titanium TA 2. Because the material library of the DEFORM does not have material parameters corresponding to the substrate 2 and the clad plate 4, the JMATPRO software can be used for respectively calculating material performance parameters such as Young modulus, thermal conductivity, heat capacity, Poisson's ratio, linear expansion coefficient and the like of the substrate 2 and the clad plate 4 through chemical components of a low-alloy steel plate and a titanium plate, and the material performance parameters are stored as a KEY file; and importing the KEY file containing the material information into DEFORM software, constructing a material database of the rolled blank, and finishing the setting of the material attribute of the blank.
And 4, setting the positioning and contact conditions of the object block:
in the object block positioning module, the position relations of the base plate 2, the cover plate 4 and the push plate 3 are set by using modes of deviation, interference and the like, so that the object blocks are ensured not to interfere; setting the contact relation among the base plate 2, the shroud plate 4 and the push plate 3, wherein the base plate 2 is set to be in contact with the roller 1 by utilizing the interference condition, the shroud plate 4 is in contact joint with the base plate 2, the base plate 2 is in contact joint with the push plate 3, and the shroud plate 4 is in contact joint with the push plate 3; the friction type between the base plate 2 and the roller 1, between the base plate 2 and the clad plate 4, between the base plate 2 and the push plate 3, and between the clad plate 4 and the push plate 3 is shear friction, the friction coefficient between the base plate 2 and the roller 1 is 1.20, the friction coefficient between the base plate 2 and the clad plate 4 is 1.20, and the friction coefficient between the push plate 3 and the blank is 0.08; meanwhile, in order to avoid dislocation of the base plate 2 and the cover plate 4 during rolling, bonding and sewing conditions need to be set on the interface; the contact between the roller 1 and the outer surface of the blank is set by utilizing interference conditions, the offset distance of the roller 1 along the thickness direction is equal to the reduction distance of each pass of rolling, the thickness of each pass of the rolled blank is changed to 25-20-15.5-12-9-7-5.5-4.5-4mm, and the total reduction rate of rolling is 84%.
the initial temperature of the rolled stock was set at 900 ℃ and the strain rate of the base plate 2 and the skin plate 4 was set in the property module at 1s-1The rolling speed of the roll 1 is set to 1500mm/s and the movement speed of the pusher is set to 300mm/s in the tool motion module. Controlling the relative motion between the push plate 3 and the base plate 2 and between the push plate 3 and the shroud plate 4 through the displacement-time relation; the upper surface of the base plate 2, the side surfaces of the base plate 2 and the cover plate 4 are set as heat exchange surfaces, and the heat exchange coefficient is set to be 20 Kw/(m)2·℃)。
after the solution analysis and post-processing of the creation operation, residual strain values in all directions near the interface of the titanium/steel composite plate can be obtained, as shown in fig. 6.
According to the control method of the invention, the residual strain values of the titanium steel composite plates at different rolling temperatures are obtained in the examples 1 to 3, and are shown in figures 4, 5 and 6. The residual strain value of the interface substrate side is higher than that of the composite material side at each rolling temperature, the residual strains of the substrate side and the composite material side close to the interface tend to rise first and then fall with the rise of the rolling temperature, the residual strains reach the maximum value at the hot rolling temperature of 850 ℃, the greater the residual strain is, the more the metallurgical bonding of the titanium/steel composite plate substrate and the composite material is facilitated, and meanwhile, the difference of the residual strain values of the substrate side and the composite material side is extremely small at the hot rolling temperature of 850 ℃, which shows that the deformation of the substrate side and the deformation of the composite material side at the temperature are basically consistent, and the bonding of the substrate and the composite material is facilitated. Therefore, when the rolling temperature is 850 ℃, the strain in the base material and the composite material is the largest, and the values of the residual strain on the base material side and the composite material side are substantially uniform, which is the optimum rolling temperature. Therefore, the method can well simulate the rolling process of the composite plate under the condition that the technological parameters are accurately controlled, and the obtained residual strain data can better guide the actual industrial production, thereby realizing the optimal control of the residual strain after rolling.
In conclusion, the invention researches the rolling process of producing the titanium/steel composite plate, sets the rolling parameters of the composite plate through the pre-processing module, establishes the DEFORM finite element model of the rolling process of the titanium/steel composite plate, analyzes the simulation result after the rolling is finished through the post-processing, obtains the residual stress data near the composite interface of the titanium/steel composite plate under different rolling processes, replaces the actual production process with DEFORM finite element simulation, controls the residual stress of the titanium/steel composite plate, can greatly reduce the production cost, and has great practical value.
Claims (7)
1. A control method of residual strain in the rolling process of a titanium steel composite plate is characterized by comprising the following steps: according to the method, through establishing physical models of a titanium steel composite plate rolling blank, a roller (1) and a push plate (3), setting composite plate rolling parameters in a DEFORM pretreatment module of finite element analysis software, establishing a DEFORM finite element model of a titanium steel composite plate rolling process, analyzing a simulation result after rolling is completed through a post-treatment module, obtaining residual strain data near a composite interface of the titanium steel composite plate under different rolling processes, and realizing prediction and control of the residual strain of the actually produced titanium steel composite plate.
2. The method for controlling the residual strain in the rolling process of the titanium steel composite plate according to claim 1, wherein the method comprises the following steps: the control method specifically comprises the following steps:
step 1, establishing a physical model of a rolling process:
firstly, designing the shapes and the sizes of a roller (1), a rolling blank and a push plate (3) according to the actual rolling process; the rolling blank consists of a base plate (2) and a clad plate (4), and the base material (2) and the clad plate (4) need to be respectively subjected to size design; then, establishing a two-dimensional model by using CAD (computer aided design) computer aided design software, and storing the two-dimensional model as a DXF (drawing exchange function) file;
step 2, establishing a finite element model in the rolling process:
importing the two-dimensional model DXF file constructed in the step 1 into DEFORM-2D, selecting a plane strain mode in program setting conditions, dividing a finite element grid by using a tetrahedral unit for a rolling blank, defining an object form as an elastoplastomer, and setting a roller (1) and a push plate (3) as rigid bodies; the rolling mode of the rolling blank adopts symmetrical rolling, the base plate (2) is contacted with the roller (1), the shroud plate (4) is contacted and attached with the base plate (2), and the bottom surface of the shroud plate (4) is defined as a symmetrical surface (6);
step 3, setting material parameters:
the base plate (2) of the rolled composite blank adopts a common carbon structural steel plate, and the clad plate (4) adopts a titanium steel plate;
when the material library of DEFORM does not have material parameters corresponding to rolled blanks, the material performance parameters of the base plate (2) and the cover plate (4) are respectively calculated by JMATPRO software by acquiring the chemical components of a common carbon structural steel plate and industrial pure titanium TA2 and are stored as KEY files; importing the KEY file containing the material information into DEFORM software, constructing a material database of the rolling blank, and finishing the setting of the material attribute of the rolling blank;
step 4, setting the positioning and contact conditions of the object block:
the position relations of the base plate (2), the cover plate (4) and the push plate (3) are set in the object block positioning module by using commands such as deviation, interference and the like, so that the object blocks are prevented from interfering with each other; setting the contact relation among the base plate (2), the cover plate (4) and the push plate (3); setting the reduction distance of each pass of rolling, namely the offset distance of the roller (1) along the thickness direction of the rolled blank, by utilizing interference conditions; calculating the total rolling reduction rate;
step 5, setting initial and motion boundary conditions:
setting the initial hot rolling temperature of the rolled base plate (2) and the clad plate (4) in a general command module; setting the strain rate of the substrate (2) and the superstrate (4) in the property module; setting the rolling speed of the roller (1) in the tool action module; controlling the relative motion of the push plate (3) and the base plate (2) and the relative motion of the push plate (3) and the shroud plate (4) through the displacement-time relation; setting the upper surface of the base plate (2), the side surfaces of the base plate (2) and the cover (4) as heat exchange surfaces, and setting a heat exchange coefficient;
step 6, solving analysis and post-processing:
after the solution analysis of the creation operation, residual strain values in all directions near the interface of the titanium steel composite plate can be obtained in a post-processing module, and the optimal rolling process is optimized by comparing the residual strains of different rolling processes.
3. The method for controlling the residual strain in the rolling process of the titanium steel composite plate according to claim 2, wherein the method comprises the following steps: the contact relation among the base plate (2), the cover plate (4) and the push plate (3) is that the base plate (2) is in contact with the roller (1) by utilizing interference conditions, the cover plate (4) is in contact joint with the base plate (2), the base plate (2) is in contact joint with the push plate (3), and the cover plate (4) is in contact joint with the push plate (3); the friction type between the base plate (2) and the roller (1), between the base plate (2) and the cover plate (4), between the base plate (2) and the push plate (3), and between the cover plate (4) and the push plate (3) is shear friction, and the shear friction coefficient is set; the composite interface (5) needs to be set with bonding and sewing conditions to generate bonding points.
4. The method for controlling the residual strain in the rolling process of the titanium steel composite plate according to claim 2, wherein the method comprises the following steps: in step 3, the material performance parameters include, but are not limited to, young's modulus, thermal conductivity, heat capacity, poisson's ratio, and linear expansion coefficient.
5. The method for controlling the residual strain in the rolling process of the titanium steel composite plate according to claim 2, wherein the method comprises the following steps: in step 4, the rolling total reduction rate is the ratio of the total offset distance to the sum of the thickness of the initial substrate and the thickness of the initial shroud plate.
6. The method for controlling the residual strain in the rolling process of the titanium steel composite plate according to claim 2, wherein the method comprises the following steps: in step 4, the rolling total reduction rate is 84%.
7. According to claimThe method for controlling the residual strain in the rolling process of the titanium steel composite plate is characterized by comprising the following steps: in the step 5, the rolling temperature range is 800-900 ℃, and the strain rate is 1s-1The rolling speed was 1500 mm/s.
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