CN111695279A - Method for simulating finite element of hot continuous rolling multi-frame plate shape - Google Patents
Method for simulating finite element of hot continuous rolling multi-frame plate shape Download PDFInfo
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Abstract
The invention relates to a finite element simulation method for a hot continuous rolling multi-frame plate shape, belonging to the technical field of rolling in the metallurgical industry. The technical scheme of the invention is as follows: the whole hot continuous rolling process is divided into a plurality of parts, each part is used as a sub-model, the sub-models are calculated one by adopting the combination of a living and dead unit method and a unit re-division technology, and the inheritance and the transmission of the strip steel temperature and the plate convexity are carried out by a data transmission method among the sub-models, so that the sub-models are connected in series into a whole. The invention has the beneficial effects that: the number of units of the hot continuous rolling finite element model is greatly reduced, the calculation speed is high, the requirement on a calculation platform is low, the unit distortion and the distortion are avoided, and the calculation precision is high; the continuous prediction of the convexity, the temperature and the rolling force of the strip steel plate of each machine frame in the hot continuous rolling process can be realized.
Description
Technical Field
The invention relates to a finite element simulation method for a hot continuous rolling multi-frame plate shape, belonging to the technical field of rolling in the metallurgical industry.
Background
With the rapid development of domestic manufacturing industry, especially the continuous progress of automobile reduction, higher requirements are put forward on the strength and the dimensional accuracy of the high-strength steel. With the continuous increase of the strength of the high-strength steel, the deformation resistance of the strip steel is increased, so that the required rolling force is increased in the rolling deformation process, the rolling mill frame and the roller generate larger elastic deformation, and accordingly, the error between the strip shape (including the cross section shape and the flatness) of a finished strip steel product and the target strip shape is increased, so that the strip shape control of the high-strength steel faces larger difficulty and challenge.
In order to better control the shape of the high-strength steel plate, a set of accurate plate shape prediction tools is needed, the evolution law of the multi-frame continuous rolling plate shape is systematically researched, the plate shape problem occurring on the spot is simulated and analyzed, and a plate shape control mathematical model is further optimized. At present, in the finite element analysis related to the strip shape problem, no matter hot continuous rolling or cold continuous rolling, the analysis and the research are only limited to a single stand, and the analysis of the influence of roll shifting, roll bending, rolling force, tension and the like on the strip shape after rolling in the single stand is focused. The finite element model has great limitation, only considers the influence factor of the strip shape in the local stand, neglects the influence of the previous stand on the local stand and the influence of the local stand on the next stand, and therefore, the continuous change rule of the strip shape in the whole continuous rolling process cannot be truly reflected.
Based on the current finite element commercial software, if modeling is carried out according to actual hot continuous rolling size parameters and process parameters, compared with a single-frame finite element model, the total number of continuous rolling model units is doubled to more than a million level, the calculation time step is sharply reduced, and the calculation time is greatly increased; in the hot continuous rolling calculation, as the total deformation rate is often greater than 90%, the unit continuously extends and deforms, and the unit is inevitably distorted and distorted, so that the calculation accuracy of the model is reduced, and even the calculation is terminated.
Disclosure of Invention
The invention aims to solve the problems of the existing high-strength steel plate shape control and the technical barrier of the existing multi-frame hot continuous rolling plate shape simulation, and provides a hot continuous rolling multi-frame plate shape finite element simulation method, which divides the whole hot continuous rolling process into a plurality of submodels, and adopts a combination of a dead-life unit method and a unit re-division technology to calculate the submodels one by one, thereby greatly reducing the unit number of the hot continuous rolling finite element model, having high calculation speed and low requirement on a calculation platform, avoiding the distortion and the distortion of the units and having high calculation precision; and inheritance and transmission of strip steel temperature and plate convexity among models are realized through a developed node historical data transmission method, so that all submodels are connected in series to form a whole, continuous prediction and analysis of strip steel plate convexity, temperature and rolling force in a hot continuous rolling process are realized, and the problems in the background technology are effectively solved.
The technical scheme of the invention is as follows: a finite element simulation method for the frame plate shape of multiple hot continuous rolling machines is characterized in that the whole hot continuous rolling process is divided into a plurality of parts, each part is used as a sub-model, the sub-models are calculated one by combining a dead-life unit method and a unit repartitioning technology, and the succession and the transmission of the strip steel temperature and the plate convexity are carried out by a data transmission method among the models, so that the sub-models are connected in series into a whole, and the continuous prediction of the strip steel convexity, the temperature and the rolling force of each rack in the hot continuous rolling process is realized.
The whole hot continuous rolling process is divided into a plurality of parts according to the actual pass reduction rate, the pass reduction rate of an upstream machine frame is large, and one or two machine frames can be divided into one part; the pass reduction rate of the downstream machine frame is small, and the three machine frames can be divided into one part; each section serves as a sub-model.
The life and death unit method is characterized in that in the hot continuous rolling calculation, in order to reduce model units, a short section of strip steel is selected, and when rolling is carried out in a certain rack, all units of other racks are killed; after the rolling of the frame, when the strip steel is positioned between the frames, all the frame units are killed, and only the strip steel participates in the calculation; before the strip steel is bitten into the next rack, activating the unit of the rack and participating in rolling calculation again; that is, only one stand unit at most participates in the calculation during the whole rolling process.
The unit re-division technology is that after the calculation of the sub-model is finished, key node coordinates of the upper end and the lower end of a certain cross section in the stable rolling stage of strip steel in the model are extracted; and according to the key node coordinates, the cross section is divided again in the next sub-model, and then the generated cross section is uniformly expanded into strip steel units, so that the strip steel units are eight-node hexahedral units with regular shapes in both the transverse direction and the longitudinal direction of the strip steel.
The data transmission method between the models comprises data transmission of the convexity of the strip steel plate. Specifically, after calculation of the sub-models is finished, coordinates of key nodes at the upper and lower ends of a certain cross section in the stable rolling stage of the strip steel in the model are extracted and stored in a command stream file, the command stream file is operated to generate the cross section of the strip steel when the next sub-model is modeled, and the generated cross section is uniformly expanded into strip steel units, so that the consistency of the convexity of the strip steel in the front and rear sub-models can be ensured.
The inter-model data transmission method further comprises data transmission of strip steel temperature, specifically, after calculation of the sub-models is finished, strip steel node temperature is extracted into a new file according to the node number sequence, and then the node temperature is assigned to the strip steel node in the next sub-model according to the node sequence through a sub-program to serve as an initial temperature field, so that consistency of strip steel temperature in the front sub-model and the back sub-model is guaranteed.
The invention has the beneficial effects that: the whole hot continuous rolling process is divided into a plurality of sub-models, the sub-models are calculated one by combining a living and dead unit method and a unit re-dividing technology, the number of units of the continuous rolling finite element model is greatly reduced by a segmentation idea, the calculation speed is increased, and the calculation can be carried out on a commonly configured workstation, so that an over-calculation center is replaced, and the cost is saved; the complex multi-frame continuous rolling is simplified into the situation that the unit with at most one frame always participates in the calculation, so that the calculation efficiency is improved; the problem that the existing commercial finite element software is insufficient in the capability of subdividing the hexahedral unit is solved, the distortion and the torsional deformation of the unit are avoided, and the calculation precision is improved. And inheritance and transmission of strip steel temperature and plate convexity between models are realized through a developed node historical data transmission method, so that all submodels are connected in series to form a whole, continuous prediction and analysis of the strip steel convexity, the temperature and the rolling force in the hot continuous rolling process are realized, the strip shape change rule in the continuous rolling process can be completely researched, and the strip shape problem analysis and the process parameter optimization are facilitated.
Drawings
FIG. 1 is a schematic diagram of a simulation concept of hot continuous rolling according to the present invention;
FIG. 2 is a schematic diagram of the life-death unit process of the present invention;
FIG. 3 is a flow chart of the inter-model node temperature data transfer of the present invention;
FIG. 4 is a graph of the results of inter-model node temperature data transfer in accordance with the present invention;
FIG. 5 is a flow chart of the convexity transfer of the inter-mold strip steel plates of the present invention;
FIG. 6 is a graph showing the results of the convexity transfer of the inter-mold strip steel sheets of the present invention;
FIG. 7 is a schematic diagram of the cell repartitioning technique of the present invention;
FIG. 8 is a distribution diagram of the convexity of the calculation plate of the strip steel at the outlet of each rack along the width direction according to the present invention;
FIG. 9 is a comparison of calculated plate crown versus measured plate crown for a finished strip steel in the width direction in accordance with the present invention;
FIG. 10 is a comparison of the calculated strip temperature and the measured temperature of the present invention;
FIG. 11 is a comparison of calculated rolling force versus measured rolling force for each stand in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A finite element simulation method for the frame plate shape of multiple hot continuous rolling machines is characterized in that the whole hot continuous rolling process is divided into a plurality of parts, each part is used as a sub-model, the sub-models are calculated one by combining a dead-life unit method and a unit repartitioning technology, and the succession and the transmission of the strip steel temperature and the plate convexity are carried out by a data transmission method among the models, so that the sub-models are connected in series into a whole, and the continuous prediction of the strip steel convexity, the temperature and the rolling force of each rack in the hot continuous rolling process is realized.
The whole hot continuous rolling process is divided into a plurality of parts according to the actual pass reduction rate, the pass reduction rate of an upstream machine frame is large, and one or two machine frames can be divided into one part; the pass reduction rate of the downstream machine frame is small, and the three machine frames can be divided into one part; each section serves as a sub-model.
The life and death unit method is characterized in that in the hot continuous rolling calculation, in order to reduce model units, a short section of strip steel is selected, and when rolling is carried out in a certain rack, all units of other racks are killed; after the rolling of the frame, when the strip steel is positioned between the frames, all the frame units are killed, and only the strip steel participates in the calculation; before the strip steel is bitten into the next rack, activating the unit of the rack and participating in rolling calculation again; that is, only one stand unit at most participates in the calculation during the whole rolling process.
The unit re-division technology is that after the calculation of the sub-model is finished, key node coordinates of the upper end and the lower end of a certain cross section in the stable rolling stage of strip steel in the model are extracted; and according to the key node coordinates, the cross section is divided again in the next sub-model, and then the generated cross section is uniformly expanded into strip steel units, so that the strip steel units are eight-node hexahedral units with regular shapes in both the transverse direction and the longitudinal direction of the strip steel.
The data transmission method between the models comprises data transmission of the convexity of the strip steel plate. Specifically, after calculation of the sub-models is finished, coordinates of key nodes at the upper and lower ends of a certain cross section in the stable rolling stage of the strip steel in the model are extracted and stored in a command stream file, the command stream file is operated to generate the cross section of the strip steel when the next sub-model is modeled, and the generated cross section is uniformly expanded into strip steel units, so that the consistency of the convexity of the strip steel in the front and rear sub-models can be ensured.
The inter-model data transmission method further comprises data transmission of strip steel temperature, specifically, after calculation of the sub-models is finished, strip steel node temperature is extracted into a new file according to the node number sequence, and then the node temperature is assigned to the strip steel node in the next sub-model according to the node sequence through a sub-program to serve as an initial temperature field, so that consistency of strip steel temperature in the front sub-model and the back sub-model is guaranteed.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The actual roll size parameters and rolling process parameters of a hot continuous rolling production line of a certain steel mill are listed in tables 1 and 2. And establishing a hot continuous rolling finite element model according to the parameters.
TABLE 1 dimensional parameters of work and backup rolls
TABLE 2 Rolling Process parameters
The finite element modeling idea of the hot continuous rolling is as shown in fig. 1, a seven-stand hot continuous rolling production line is divided into four parts, namely a descaling stand, an F1 stand and an F2 stand, an F3 stand and an F4 stand, and the rest three stands, namely F5, F6 and F7, wherein each part is calculated as a single sub-model.
The use of the unit life-death method, the inter-model data transfer method, and the unit repartitioning technique is described below in conjunction with a specific model.
Fig. 2 shows the use of the unit life-death method in the submodel 2. Step one, in a state before rolling; step two, the strip steel enters the first rack for rolling, and the unit of the second rack is killed; rolling the strip steel on the first rack, keeping the strip steel in a heat dissipation state between the racks, and continuously killing the first rack unit; and step four, the strip steel enters a second rack for rolling, and the unit of the second rack is activated to participate in rolling calculation.
The cross-sectional shape in the sub-model 2 is transferred to the sub-model 3 according to the flow shown in fig. 3, so that the inheritance of the plate convexity is realized. Fig. 4 is a diagram showing the effect of the plate convexity transfer.
And transmitting the strip steel node temperature in the sub-model 2 to the sub-model 3 according to the flow shown in the figure 5, so as to realize the inheritance of the strip steel temperature. It can be seen from fig. 6 that the strip temperature remains the same in the front and rear submodels.
Fig. 7 shows the cell shape comparison before and after using the cell repartitioning technique. As can be seen from FIG. 7, after the unit is divided again, the unit is regular no matter in the strip rolling direction and the width direction, and the calculation precision is ensured.
Fig. 8 shows the calculated outlet plate convexity of each stand in the width direction of the strip. As can be seen from fig. 8, the plate convexity tends to decrease gradually as a whole from the F1 frame to the F7 frame.
The calculated F7 frame exit strip steel plate crown and measured plate crown are given in fig. 9 and table 3. Both can be seen from Table 3C W40 The error is small, and the hot continuous rolling plate-shaped finite element simulation method is accurate and reliable.
TABLE 3F 7 Outlet plate convexity contrast results
The calculated strip temperatures for each stand and the measured exit strip temperature for the F7 stand are shown in fig. 10. As can be seen from fig. 10, the calculated F7 exit strip temperature was consistent with the measured values, illustrating the accuracy of the method in calculating the strip temperature.
The calculated and measured rolling forces for each stand are shown in fig. 11 and table 4. It can be seen that the calculated rolling force is substantially consistent with the measured rolling force with a relative error within 10%, demonstrating the accuracy of the method in calculating the rolling force.
TABLE 4 comparison of the rolling forces of the stands
Claims (6)
1. A hot continuous rolling multi-frame plate shape finite element simulation method is characterized in that: the whole hot continuous rolling process is divided into a plurality of parts, each part is used as a sub-model, the sub-models are calculated one by adopting the combination of a living and dead unit method and a unit subdivision technology, and the succession and the transmission of the strip steel temperature and the plate convexity are carried out by a data transmission method among the models, so that the sub-models are connected in series into a whole, and the continuous prediction of the strip steel convexity, the temperature and the rolling force of each rack in the hot continuous rolling process is realized.
2. The finite element simulation method of the hot continuous rolling multi-frame plate shape according to claim 1, wherein the finite element simulation method comprises the following steps: the whole hot continuous rolling process is divided into a plurality of parts according to the actual pass reduction rate, the pass reduction rate of an upstream machine frame is large, and one or two machine frames can be divided into one part; the pass reduction rate of the downstream machine frame is small, and the three machine frames can be divided into one part; each section serves as a sub-model.
3. The finite element simulation method of the hot continuous rolling multi-frame plate shape according to claim 1, wherein the finite element simulation method comprises the following steps: the life and death unit method is characterized in that in the hot continuous rolling calculation, in order to reduce model units, a short section of strip steel is selected, and when rolling is carried out in a certain rack, all units of other racks are killed; after the rolling of the frame, when the strip steel is positioned between the frames, all the frame units are killed, and only the strip steel participates in the calculation; before the strip steel is bitten into the next rack, activating the unit of the rack and participating in rolling calculation again; that is, only one stand unit at most participates in the calculation during the whole rolling process.
4. The finite element simulation method of the hot continuous rolling multi-frame plate shape according to claim 1, wherein the finite element simulation method comprises the following steps: the unit re-division technology is that after the calculation of the sub-model is finished, key node coordinates of the upper end and the lower end of a certain cross section in the stable rolling stage of strip steel in the model are extracted; and according to the key node coordinates, the cross section is divided again in the next sub-model, and then the generated cross section is uniformly expanded into strip steel units, so that the strip steel units are eight-node hexahedral units with regular shapes in both the transverse direction and the longitudinal direction of the strip steel.
5. The finite element simulation method of the hot continuous rolling multi-frame plate shape according to claim 1, wherein the finite element simulation method comprises the following steps: the inter-model data transmission method comprises data transmission of the convexity of the strip steel plate, and specifically means that after calculation of a sub-model is finished, the coordinates of key nodes at the upper end and the lower end of a strip steel in the model at a stable rolling stage are extracted and stored in a command stream file, the command stream file is operated to generate the cross section of the strip steel when the next sub-model is modeled, and then the generated cross section is uniformly expanded into strip steel units, so that the consistency of the convexity of the strip steel plate in the front sub-model and the back sub-model can be ensured.
6. The finite element simulation method of the hot continuous rolling multi-frame plate shape according to claim 1, wherein the finite element simulation method comprises the following steps: the inter-model data transmission method further comprises data transmission of strip steel temperature, specifically, after calculation of the sub-models is finished, strip steel node temperature is extracted into a new file according to the node number sequence, and then the node temperature is assigned to the strip steel node in the next sub-model according to the node sequence through a sub-program to serve as an initial temperature field, so that consistency of strip steel temperature in the front sub-model and the back sub-model is guaranteed.
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Application publication date: 20200922 |