阅读说明：本技术 一种预测非对称组坯轧制复合板结合面处变形渗透的方法 (Method for predicting deformation and penetration at junction surface of asymmetric assembly rolled composite plate ) 是由 王卫华 王小勇 马长文 罗家明 黄乐庆 于 2019-10-23 设计创作，主要内容包括：本发明实施例提供了一种预测非对称组坯轧制复合板结合面处变形渗透的方法,包括：根据实际情况确定复合板的性能参数；建立几何模型并对其进行离散化处理；将参数代入模型并对其施加载荷和边界条件；根据实际情况选择连接方式；利用有限元算法对模型进行求解；提取各节点的塑性应变分布规律和塑性应变值；改变复合板上下厚度比例,重复上述步骤,得到塑性应变规律。解决了现有技术中对非对称组坯带来的板形及厚度均匀性以及结合面处的变形渗透是否充分难以预测的技术问题。达到了采用有限元数值模拟技术,对非对称组坯轧制复合板结合面处的变形渗透进行了规律性研究,能够预测不同厚度比例组坯条件下,是否达到变形渗透效果的技术效果。(The embodiment of the invention provides a method for predicting deformation and permeation at a joint surface of an asymmetric assembly rolled composite plate, which comprises the following steps: determining the performance parameters of the composite board according to the actual conditions; establishing a geometric model and carrying out discretization treatment on the geometric model; substituting the parameters into the model and applying load and boundary conditions to the model; selecting a connection mode according to actual conditions; solving the model by using a finite element algorithm; extracting a plastic strain distribution rule and a plastic strain value of each node; and (4) changing the upper and lower thickness proportion of the composite plate, and repeating the steps to obtain a plastic strain rule. The technical problems that in the prior art, the plate shape and thickness uniformity caused by asymmetric assembly and whether the deformation and the penetration at a joint surface are sufficient or not are difficult to predict are solved. The technical effect that the deformation and penetration effect at the joint surface of the asymmetric assembly rolled composite plate is regularly researched by adopting a finite element numerical simulation technology, and whether the deformation and penetration effect is achieved under the conditions of assemblies with different thickness proportions can be predicted is achieved.)

1. A method for predicting deformation and penetration at a faying surface of an asymmetrically assembled rolled composite plate, the method comprising:

step 1, determining rolling process parameters, the upper and lower thickness proportion of a composite plate assembly and physical performance parameters of a composite plate according to the actual composite plate pack rolling production condition;

step 2, establishing a geometric model of the working roll and the composite plate assembly by using a finite element method, and carrying out discretization treatment on the geometric model by using a structured grid;

step 3, endowing the physical performance parameters of the composite board to the geometric model, and applying load and boundary conditions to the geometric model;

step 4, applying a correct connection mode between different materials according to the actual situation of the pack-rolled composite board;

step 5, solving the geometric model by using an explicit finite element algorithm;

step 6, extracting equivalent plastic strain of each node in the thickness direction outside a deformation region to obtain a plastic strain distribution rule of a thickness section of the composite plate and an equivalent plastic strain value of each node;

and 7, changing the upper and lower thickness proportion of the composite plate assembly, and repeating the processes of the steps 1-6 to obtain the equivalent plastic strain rule of each composite plate assembly node under different thickness proportions.

2. The method of claim 1, wherein step 3 comprises:

giving a temperature field in the physical performance parameters of the composite board and the gravity of the composite board as loads to the geometric model for loading;

determining a rough rolling schedule of the composite plate, and giving boundary condition parameters to the geometric model for loading.

3. The method of claim 1, wherein step 4 comprises:

the working roll and the composite plate are in frictional contact, wherein the frictional contact is determined by a formula f ═ mu.N according to a sliding friction law;

in the formula: mu is a sliding friction coefficient ranging from 0.1 to 0.35;

and N is the contact positive pressure (N) between the working roll and the composite plate assembly.

4. The method of claim 1, wherein step 4 comprises:

the bimetallic plates are connected in a joint mode.

5. The method of claim 1, wherein step 4 comprises:

the upper and lower composite boards are in binding contact.

6. The method of claim 1, wherein the boundary condition parameters comprise: the method comprises the following steps of working roller group blank heat dissipation boundary conditions, each pass reduction, track running speed, working roller group blank freedom degree, working roller displacement and rotation freedom degree, rotation angular speed, working roller quality and symmetrical boundary conditions.

7. The method of claim 6, wherein the work roll blank heat dissipation boundary conditions are specified as:

applying comprehensive heat exchange coefficient covering radiation and convection heat exchange to the work roll blank according to a formula

wherein: h is_rEquivalent convective heat transfer coefficient (W/m) for thermal radiation²·℃)，

Sigma is a Stefan-Boltzmann constant, and the value is 5.67 multiplied by 10^-8(W/m²·K⁴)；

Epsilon is the surface radiance;

T_sthe surface temperature of the steel plate;

T_∞is the temperature of the external environment medium.

8. The method of claim 7 wherein the heat transfer from the work roll to the work roll assembly is conducted by contact heat transfer and the heat flux is of a magnitude according to equation q_R＝h_R(T_S-T_R) Obtaining;

wherein: h is_RIs the contact heat transfer coefficient (W/m) between the roller and the assembly²C.) of 10000W/m²·℃～30000W/m²·℃；

T_sThe surface temperature of the steel plate; t is_RRoll surface temperature (. degree. C.).

Technical Field

The invention relates to the technical field of steel rolling processes, in particular to a method for predicting deformation and permeation at a joint surface of an asymmetric assembly rolling composite plate.

Background

The bimetal composite steel plates such as stainless steel and the like are used as novel energy-saving and environment-friendly materials and are widely applied in modern industry, wherein thick-specification composite plates are mostly required in chemical and nuclear power industries, but the thickness of the composite plates which can be produced in a symmetrical stack rolling mode is severely limited (generally less than or equal to 40mm) due to the limitation of the size of a heating furnace and the opening degree of a rolling mill. In order to improve the thickness of the composite plate produced in the pack rolling mode, researchers propose a rolling mode of asymmetric assembly, but the asymmetric assembly brings the problems of plate shape, thickness uniformity and the like, and particularly the problem of whether deformation and penetration at the joint surface of the composite plate assembly are sufficient in the rolling process.

However, in the process of implementing the technical solution in the embodiment of the present application, the inventor of the present application finds that the above prior art has at least the following technical problems:

Disclosure of Invention

The embodiment of the invention provides a method for predicting deformation and permeation at a composite plate combining surface in asymmetric assembly rolling, which solves the technical problems of plate shape and thickness uniformity brought by asymmetric assembly in the prior art, and particularly the technical problem that whether the deformation and permeation at the composite plate assembly combining surface in the rolling process is sufficient or not is difficult to predict.

In view of the above problems, an embodiment of the present invention provides a method for predicting deformation permeation at a joint surface of an asymmetric assembly rolling composite plate, where the method for predicting deformation permeation at a joint surface of an asymmetric assembly rolling composite plate includes: step 1, determining rolling process parameters, the upper and lower thickness proportion of a composite plate assembly and physical performance parameters of a composite plate according to the actual composite plate pack rolling production condition; step 2, establishing a geometric model of the working roll and the composite plate assembly by using a finite element method, and carrying out discretization treatment on the geometric model by using a structured grid; step 3, endowing the physical performance parameters of the composite board to the geometric model, and applying load and boundary conditions to the geometric model; step 4, applying a correct connection mode between different materials according to the actual situation of the pack-rolled composite board; step 5, solving the geometric model by using an explicit finite element algorithm; step 6, extracting equivalent plastic strain of each node in the thickness direction outside a deformation region to obtain a plastic strain distribution rule of a thickness section of the composite plate and an equivalent plastic strain value of each node; and 7, changing the upper and lower thickness proportion of the composite plate assembly, and repeating the processes of the steps 1 to 6 to obtain the equivalent plastic strain rule of each composite plate assembly node under different thickness proportions.

Further, the step 3 comprises: giving a temperature field in the physical performance parameters of the composite board and the gravity of the composite board as loads to the geometric model for loading; determining a rough rolling schedule of the composite plate, and giving boundary condition parameters to the geometric model for loading.

Further, the step 4 comprises: the working roll and the composite plate are in frictional contact, wherein the frictional contact is determined by a formula f ═ mu.N according to a sliding friction law; in the formula: mu is a sliding friction coefficient ranging from 0.1 to 0.35; and N is the contact positive pressure (N) between the working roll and the composite plate assembly.

Further, the step 4 comprises: the bimetallic plates are connected in a joint mode.

Further, the step 4 comprises: the upper and lower composite boards are in binding contact.

Further, the boundary condition parameters include: the method comprises the following steps of working roller group blank heat dissipation boundary conditions, each pass reduction, track running speed, working roller group blank freedom degree, working roller displacement and rotation freedom degree, rotation angular speed, working roller quality and symmetrical boundary conditions.

Further, the heat dissipation boundary conditions of the working roll blank specifically include: to the working roller groupThe comprehensive heat transfer coefficient of the blank application covering radiation and convection heat transfer is calculated according to a formula

Obtaining; wherein: h is_rEquivalent convective heat transfer coefficient (W/m) for thermal radiation²C. sigma is the Stefan-Boltzmann constant, and takes the value of 5.67 multiplied by 10^-8(W/m²·K⁴) (ii) a Epsilon is the surface radiance; t is_sThe surface temperature of the steel plate; t is_∞Is the temperature of the external environment medium.

Further, the heat transfer mode of the working roll and the working roll assembly is processed into contact heat transfer, and the heat flow intensity of the heat transfer is according to a formula q_R＝h_R(T_S-T_R) Obtaining; wherein: h is_RIs the contact heat transfer coefficient (W/m) between the roller and the assembly²C.) of 10000W/m²·℃～30000W/m²·℃；T_sThe surface temperature of the steel plate; t is_RRoll surface temperature (. degree. C.).

One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:

the method for predicting deformation and penetration at the joint surface of the asymmetric assembly rolled composite plate provided by the embodiment of the invention comprises the following steps: step 1, determining rolling process parameters, the upper and lower thickness proportion of a composite plate assembly and physical performance parameters of a composite plate according to the actual composite plate pack rolling production condition; step 2, establishing a geometric model of the working roll and the composite plate assembly by using a finite element method, and carrying out discretization treatment on the geometric model by using a structured grid; step 3, endowing the physical performance parameters of the composite board to the geometric model, and applying load and boundary conditions to the geometric model; step 4, applying a correct connection mode between different materials according to the actual situation of the pack-rolled composite board; step 5, solving the geometric model by using an explicit finite element algorithm; step 6, extracting equivalent plastic strain of each node in the thickness direction outside a deformation region to obtain a plastic strain distribution rule of a thickness section of the composite plate and an equivalent plastic strain value of each node; and 7, changing the upper and lower thickness proportion of the composite plate assembly, and repeating the processes of the steps 1 to 6 to obtain the equivalent plastic strain rule of each composite plate assembly node under different thickness proportions. The technical problem that in the prior art, the uniformity of plate shape and thickness caused by asymmetric assembly, especially whether deformation and penetration at the combined surface of the composite plate assembly in the rolling process are sufficient or not is difficult to predict is solved. The method achieves the technical effect that in the process of rolling the composite plate by the asymmetrical assembly and the superposition, the deformation permeation at the joint surface of the composite plate rolled by the asymmetrical assembly is regularly researched by adopting a finite element numerical simulation technology, and whether the deformation permeation effect is achieved or not in the process of rolling the composite plate by the asymmetrical assembly is predicted under the conditions of assembling the assemblies with different thickness proportions.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

FIG. 1 is a schematic flow chart of a method for predicting deformation and penetration at a bonding surface of an asymmetric assembly rolled composite plate.

Fig. 2 is a schematic structural diagram of an asymmetric assembly rolling device.

FIG. 3 is a schematic diagram of a finite element model after discretization of an asymmetric assembly in a method for predicting deformation permeation at a joint surface of an asymmetric assembly rolled composite plate.

Fig. 4 is a schematic diagram of a plastic strain distribution rule of a thickness section of a composite plate obtained in a method for predicting deformation and penetration at a joint surface of an asymmetric assembly rolled composite plate.

Fig. 5 is a schematic diagram of a plastic strain distribution rule of a composite plate thickness section at different thickness proportions obtained in a method for predicting deformation and penetration at a composite plate combining surface rolled by an asymmetric assembly.

Fig. 6 is a schematic diagram of an equivalent plastic strain law of a node at the junction surface of each group of blanks obtained in a method for predicting deformation and penetration at the junction surface of an asymmetric group-blank rolled composite plate.

Description of reference numerals: a roller 1, a substrate 2 and a compound plate 3.

Detailed Description

The embodiment of the invention provides a method for predicting deformation and permeation at a composite plate combining surface in asymmetric assembly rolling, which solves the technical problems of plate shape and thickness uniformity brought by asymmetric assembly in the prior art, and particularly the technical problem that whether the deformation and permeation at the composite plate assembly combining surface in the rolling process is sufficient or not is difficult to predict.

The technical scheme provided by the invention has the following general idea: the method comprises the following steps: step 1, determining rolling process parameters, the upper and lower thickness proportion of a composite plate assembly and physical performance parameters of a composite plate according to the actual composite plate pack rolling production condition; step 2, establishing a geometric model of the working roll and the composite plate assembly by using a finite element method, and carrying out discretization treatment on the geometric model by using a structured grid; step 3, endowing the physical performance parameters of the composite board to the geometric model, and applying load and boundary conditions to the geometric model; step 4, applying a correct connection mode between different materials according to the actual situation of the pack-rolled composite board; step 5, solving the geometric model by using an explicit finite element algorithm; step 6, extracting equivalent plastic strain of each node in the thickness direction outside a deformation region to obtain a plastic strain distribution rule of a thickness section of the composite plate and an equivalent plastic strain value of each node; and 7, changing the upper and lower thickness proportion of the composite plate assembly, and repeating the processes of the steps 1 to 6 to obtain the equivalent plastic strain rule of each composite plate assembly node under different thickness proportions.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.