Anti-oxidation composite board assembly rolling method based on thermally induced cambered surface effect

Abstract

The invention belongs to the technical field of metal composite material rolling processes, and particularly relates to an anti-oxidation composite plate assembly rolling method based on a thermally induced cambered surface effect, which comprises the following steps: acquiring composite plate processing data of a 304 stainless steel plate, a 45 steel plate and a TA1 plate; rolling data are obtained based on the function relation between the composite board processing data and the rolling data; the composite board processing data comprises the size and relative position data and heating data of a 304 stainless steel plate, a 45 steel plate and a TA1 plate; a 45 steel plate is fixedly arranged in a closed cavity formed by splicing a 304 stainless steel plate and a TA1 plate; vacuumizing the closed cavity to form a composite board combined blank; and feeding the composite plate combined blank into a furnace for rolling. According to the method, the thermal expansion coefficient difference of the 304 stainless steel plate, the 45 steel plate and the TA1 plate is utilized, interface gaps are directly pushed to be closed, gaps are prevented from being generated on the interface, interface oxidation is effectively avoided, and the quality and the bonding strength of the rolled composite plate manufactured through the method are both improved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal composite material rolling technology, and in particular relates to an anti-oxidation composite plate assembly rolling method based on thermally induced cambered surface effect. Background Art

[0002] The rolling and cladding of titanium / steel composite materials has always been a hot topic of research. However, due to the huge differences between titanium and steel in mechanical properties, thermal expansion coefficient, microstructure, etc., the resulting deformation inconsistency problem has always been a major difficulty in the field of titanium / steel composite plate rolling. Designing a new billet assembly method and making full use of the different expansion coefficients of dissimilar metal materials can effectively improve the rolling effect.

[0003] In traditional hot rolling, titanium and steel are welded together according to the same surface dimensions, placed in a heating furnace for heating, and then subjected to continuous multi-pass heating. This results in poor plate shape, large residual stress, and severe flexural deformation of the plate after rolling. Studies have shown that wave-flat continuous rolling has a positive effect on improving the plate shape and bonding strength of composite plates. However, during the rolling process, there are phenomena such as severe plate bending after the first rolling pass, uneven plate temperature before the second rolling pass, and significant influence of ambient temperature. Furthermore, when rolling metals with inconsistent deformation, interfacial oxidation will occur, which has a significant negative impact on the quality and bonding strength of the composite plate after rolling.

[0004] Therefore, there is an urgent need for a billet rolling method for anti-oxidation composite plates based on the thermally induced cambered surface effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for rolling an oxidation-resistant composite plate based on a thermally induced cambered surface effect, so as to solve the above-mentioned problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A method for rolling an oxidation-resistant composite plate based on a thermally induced cambered surface effect, comprising:

[0008] Obtain composite plate processing data of 304 stainless steel plate, 45 steel plate and TA1 plate;

[0009] Acquiring the rolling data based on a functional relationship between the composite plate processing data and the rolling data;

[0010] The composite plate processing data includes the size and relative position data and heating data of the 304 stainless steel plate, 45 steel plate and TA1 plate;

[0011] The 45 steel plate is fixedly placed in a closed chamber formed by splicing the 304 stainless steel plate and the TA1 plate;

[0012] The closed chamber is evacuated to form a composite board composite blank;

[0013] The composite plate composite billet is put into a furnace for rolling;

[0014] in,

[0015] The size of the 45 steel plate is smaller than that of the 304 stainless steel plate, and the size of the 304 stainless steel plate matches that of the TA1 plate.

[0016] Optionally, the step of fixing the 45 steel plate in a sealed chamber formed by splicing the 304 stainless steel plate and the TA1 plate includes:

[0017] One side of the 45 steel plate is fixed to the middle of the 304 stainless steel plate;

[0018] The TA1 plate is arranged on the other side of the 45 steel plate and fixed to the 304 stainless steel plate;

[0019] The TA1 plate and the 304 stainless steel plate are sealed at their edges to form the sealed chamber.

[0020] Optionally, the step of fixing one side of the 45 steel plate to the middle of the 304 stainless steel plate includes:

[0021] Grinding the contact surface between the 45 steel plate and the 304 stainless steel plate, and fixing the edge of the 45 steel plate to the surface of the 304 stainless steel plate by spot welding;

[0022] A plurality of welding spots arranged at intervals are formed between the 45 steel plate and the 304 stainless steel plate.

[0023] Optionally, the step of arranging the TA1 plate on the other side of the 45 steel plate and fixing it to the 304 stainless steel plate includes:

[0024] The contact surface between the 45 steel plate and the TA1 plate was polished, and the TA1 plate was placed on the side of the 45 steel plate away from the 304 stainless steel plate.

[0025] Optionally, the step of sealing the edges of the TA1 plate and the 304 stainless steel plate to form the sealed chamber includes:

[0026] The 304 stainless steel plate is coaxially aligned with the TA1 plate;

[0027] Use a sealing long steel bar to cover the long edge between the 304 stainless steel plate and the TA1 plate and weld them in place;

[0028] A sealing short steel bar is used to cover the short side edge between the 304 stainless steel plate and the TA1 plate and is welded and fixed.

[0029] Optionally, the step of forming a composite board assembly blank after the closed chamber is vacuumed includes:

[0030] Fix one end of the vacuum steel pipe on any of the sealing short steel bars, connect one end of the vacuum steel pipe with the closed chamber, use a vacuum equipment to connect the other end of the vacuum steel pipe to evacuate the closed chamber, and after the vacuum is completed, use an argon arc welding machine to seal and weld the vacuum interface of the vacuum steel pipe.

[0031] Optionally, the step of feeding the composite plate composite billet into a furnace for rolling includes:

[0032] After the composite board is assembled, it is placed in an argon atmosphere box-type heating furnace for heating.

[0033] Optionally, after the composite plate composite billet is put into a furnace for rolling, the method further comprises:

[0034] After being taken out of the furnace, the composite plate composite billet is continuously subjected to one pass of corrugation rolling and two passes of flat rolling.

[0035] Optionally, the step of obtaining composite plate processing data of 304 stainless steel plate, 45 steel plate and TA1 plate includes:

[0036] Based on the simulation model, the initial internal stress and initial bending deflection of the composite plate are obtained according to the size and relative position data of the 304 stainless steel plate, the 45 steel plate and the TA1 plate;

[0037] Obtaining the post-heating bending deflection based on a functional relationship among the post-heating bending deflection, the initial bending deflection, a set heating temperature, a set heating time, a thermal expansion coefficient of the 45 steel plate, a thermal expansion coefficient of the 304 stainless steel plate, and a thermal expansion coefficient of the TA1 plate;

[0038] Obtaining the internal stress of the composite plate after heating based on a functional relationship among the internal stress of the composite plate after heating, the initial internal stress of the composite plate, the bending deflection after heating, the thermal expansion coefficient of the 45 steel plate, the thermal expansion coefficient of the 304 stainless steel plate, and the thermal expansion coefficient of the TA1 plate;

[0039] When it is determined that the internal stress of the heated composite plate satisfies that the internal stress of the heated composite plate is less than the allowable stress of rolling, and the bending deflection after heating satisfies that the bending deflection after heating is less than the allowable bending deflection of rolling, the current size and relative position data and heating data of the 304 stainless steel plate, 45 steel plate and TA1 plate are selected as the composite plate processing data.

[0040] Optionally, the step of acquiring the rolling data based on the functional relationship between the composite plate processing data and the rolling data includes:

[0041] Based on the simulation model, the shear strength, residual stress and bending deflection of the composite plate are obtained according to the rolling force, rolling speed, rolling reduction, corrugation roller parameters, the internal stress of the composite plate after heating and the bending deflection after heating;

[0042] When it is determined that the shear strength of the composite plate satisfies that the shear strength of the composite plate is greater than the allowable shear strength, the residual stress satisfies that the residual stress is less than the allowable stress after rolling, and the bending deflection satisfies that the allowable stress after rolling is less than the allowable bending deflection after rolling, the rolling force, the rolling speed, the rolling reduction and the corrugated roller parameters are selected as the rolling data.

[0043] Compared with the prior art, the present invention has the following advantages and technical effects:

[0044] The present invention sandwiches a 45 steel plate between a 304 stainless steel plate and a TA1 plate, and utilizes the difference in thermal expansion coefficients of the three layers of metal 304 stainless steel plate, 45 steel plate and TA1 plate to spontaneously form a centripetal arc surface during the heating process, directly promoting the closure of the interface gap, avoiding the generation of gaps at the interface, and effectively avoiding interface oxidation. At the same time, the difference in expansion coefficients is utilized to form pre-compression stress between the layers, effectively enhancing the rolling bond. The arc surface formed by the thermally induced arc surface effect gradually flattens during high-temperature rolling, and finally a titanium-steel composite plate with a straight plate shape and high bonding strength is obtained. In summary, the composite plate prepared using the present method has improved quality and bonding strength after rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0046] Figure 1 It is a process flow chart of the present invention;

[0047] Figure 2 A flow chart for obtaining data for composite plate processing according to the present invention;

[0048] Figure 3 The present invention is a rolling data acquisition flow chart;

[0049] Figure 4 This is an exploded view of the process steps of the present invention;

[0050] Figure 5 This is a flow chart of the rolling theory and simulation model of the present invention;

[0051] Figure 6 This is a schematic diagram of spot welding of 45 steel plate and 304 stainless steel plate of the present invention;

[0052] Figure 7 This is a schematic diagram of the titanium / steel composite plate assembly of the present invention;

[0053] Figure 8 This is a schematic diagram of continuous welding of the titanium / steel composite plate frame of the present invention;

[0054] Figure 9 This is a schematic diagram of the deformation of the titanium / steel composite plate after heating according to the present invention;

[0055] Figure 10 This is a schematic diagram of the deflection curve of the titanium / steel composite plate after heating and bending according to the present invention;

[0056] Figure 11 This is a diagram showing the mechanism of the thermally induced arc surface effect of the present invention;

[0057] Figure 12 This is an SEM image of the macroscopic interface and the microscopic morphology of the bonding interface of the titanium / steel composite plate after rolling of the present invention;

[0058] Figure 13 The SEM and surface scanning element distribution of the side shear section of 45 steel of the present invention;

[0059] Among them, 1. 45 steel plate; 2. 304 stainless steel plate; 3. welding point; 5. vacuum steel pipe; 6. sealed long steel bar; 7. TA1 plate; 8. sealed short steel bar; 9. plate after heating and bending; 10. test sample removed from rolled plate; 11. TA1 / 45 interface micromorphology SEM; 12. 45 / 304 interface micromorphology SEM; 13. 45 steel side shear section; 14. shear dimple; 15. Fe distribution surface of shear section; 16. Ti distribution surface of shear section. DETAILED DESCRIPTION

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0061] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] Reference Figures 1 to 13 The present invention discloses a method for rolling an anti-oxidation composite plate based on a thermally induced cambered surface effect, comprising:

[0063] Acquire composite plate processing data of 304 stainless steel plate 2, 45 steel plate 1, and TA1 plate 7;

[0064] Acquiring rolling data based on a functional relationship between composite plate processing data and rolling data;

[0065] The composite plate processing data includes the size and relative position data and heating data of the 304 stainless steel plate 2, the 45 steel plate 1 and the TA1 plate 7;

[0066] The 45 steel plate 1 is fixedly placed in a closed chamber formed by the 304 stainless steel plate 2 and the TA1 plate 7;

[0067] After the closed chamber is vacuumed, composite board composite blanks are formed;

[0068] Composite plate combined billet enters furnace for rolling;

[0069] in,

[0070] The size of 45 steel plate 1 is smaller than that of 304 stainless steel plate 2, and the sizes of 304 stainless steel plate 2 and TA1 plate 7 match.

[0071] The present invention sandwiches a 45 steel plate 1 between a 304 stainless steel plate 2 and a TA1 plate 7, and utilizes the difference in thermal expansion coefficients of the three layers of metal 304 stainless steel plate, 45 steel plate and TA1 plate to spontaneously form a centripetal arc surface during the heating process, directly promoting the closure of the interface gap, avoiding the generation of gaps at the interface, and effectively avoiding interface oxidation. At the same time, the difference in expansion coefficients is utilized to form pre-compression stress between the layers, effectively enhancing the rolling bond. The arc surface formed by the thermally induced arc surface effect gradually flattens during high-temperature rolling, and finally a titanium steel composite plate with a straight plate shape and high bonding strength is obtained. In summary, the composite plate prepared using this method has improved quality and bonding strength after rolling.

[0072] As an optional embodiment, the steps of fixing the 45 steel plate 1 in a sealed chamber formed by splicing the 304 stainless steel plate 2 and the TA1 plate 7 include:

[0073] One side of the 45 steel plate 1 is fixed to the middle of the 304 stainless steel plate 2;

[0074] TA1 plate 7 is set on the other side of 45 steel plate 1 and fixed to 304 stainless steel plate 2;

[0075] The edges of the TA1 plate 7 and the 304 stainless steel plate 2 are sealed to form a closed chamber.

[0076] As an optional embodiment, the step of fixing one side of the 45 steel plate 1 to the middle of the 304 stainless steel plate 2 includes:

[0077] Grind the contact surface between the 45 steel plate 1 and the 304 stainless steel plate 2, and fix the edge of the 45 steel plate 1 to the surface of the 304 stainless steel plate 2 by spot welding;

[0078] A number of weld points 3 arranged at intervals are formed between the 45 steel plate 1 and the 304 stainless steel plate 2.

[0079] As an optional embodiment, the steps of disposing the TA1 plate 7 on the other side of the 45 steel plate 1 and fixing it to the 304 stainless steel plate 2 include:

[0080] Polish the contact surface between the 45 steel plate 1 and the TA1 plate 7, and place the TA1 plate 7 on the side of the 45 steel plate 1 away from the 304 stainless steel plate 2.

[0081] As an optional embodiment, the step of sealing the edges of the TA1 plate 7 and the 304 stainless steel plate 2 to form a closed chamber includes:

[0082] The 304 stainless steel plate 2 is coaxially aligned with the TA1 plate 7;

[0083] Use sealing long steel strip 6 to cover the long edge between 304 stainless steel plate 2 and TA1 plate 7 and weld them in place;

[0084] A sealing short steel bar 8 is used to cover the short side edge between the 304 stainless steel plate 2 and the TA1 plate 7 and is welded and fixed.

[0085] As an optional embodiment, the step of forming a composite board composite blank after the closed chamber is vacuumed includes:

[0086] Fix one end of the vacuum steel pipe 5 on any sealing short steel bar 8, connect one end of the vacuum steel pipe 5 with the closed chamber, use the vacuum equipment to connect the other end of the vacuum steel pipe 5 to evacuate the closed chamber, and after the vacuum is completed, use the argon arc welding machine to seal and weld the vacuum interface of the vacuum steel pipe 5.

[0087] As an optional embodiment, the step of feeding the composite plate composite billet into the furnace for rolling includes:

[0088] After the composite board is assembled, it is placed in an argon atmosphere box-type heating furnace for heating.

[0089] As an optional embodiment, after the composite plate composite billet is put into the furnace for rolling, the following steps are further included:

[0090] After the composite plate composite billet is taken out of the furnace, it undergoes one pass of corrugation rolling and two passes of flat rolling.

[0091] As an optional embodiment, the steps of obtaining composite plate processing data of the 304 stainless steel plate 2, the 45 steel plate 1 and the TA1 plate 7 include:

[0092] Based on the simulation model, the initial composite plate internal stress and initial bending deflection are obtained according to the size and relative position data of 304 stainless steel plate 2, 45 steel plate 1 and TA1 plate 7;

[0093] Obtaining the bending deflection after heating based on a functional relationship of the bending deflection after heating, the initial bending deflection, the set heating temperature, the set heating time, the thermal expansion coefficient of the 45 steel plate 1, the thermal expansion coefficient of the 304 stainless steel plate 2, and the thermal expansion coefficient of the TA1 plate 7;

[0094] The internal stress of the composite plate after heating is obtained based on the functional relationship of the internal stress of the composite plate after heating, the initial internal stress of the composite plate, the bending deflection after heating, the thermal expansion coefficient of the 45 steel plate 1, the thermal expansion coefficient of the 304 stainless steel plate 2, and the thermal expansion coefficient of the TA1 plate 7;

[0095] When it is determined that the internal stress of the composite plate after heating satisfies the condition that the internal stress of the composite plate after heating is less than the allowable stress of rolling, and the bending deflection after heating satisfies the condition that the bending deflection after heating is less than the allowable bending deflection of rolling, the current size and relative position data of the 304 stainless steel plate 2, the 45 steel plate 1 and the TA1 plate 7 and the heating data are selected as the composite plate processing data.

[0096] As an optional embodiment, the step of obtaining rolling data based on the functional relationship between the composite plate processing data and the rolling data includes:

[0097] Based on the simulation model, the shear strength, residual stress and bending deflection of the composite plate are obtained according to the rolling force, rolling speed, rolling reduction, corrugation roller parameters, internal stress of the composite plate after heating and bending deflection after heating;

[0098] When it is determined that the shear strength of the composite plate satisfies the conditions that the shear strength of the composite plate is greater than the allowable shear strength, the residual stress satisfies the conditions that the residual stress is less than the allowable stress after rolling, and the bending deflection satisfies the conditions that the allowable stress after rolling is less than the allowable bending deflection after rolling, the rolling force, rolling speed, rolling reduction and corrugated roller parameters are selected as rolling data.

[0099] This method is to use an angle grinder to install a louver wheel to grind one surface of the 304 stainless steel plate and the 45 steel plate, and use a blower to blow away the surface dust particles, remove the surface oxides and impurities, and prevent the interface from being affected. After the grinding is completed, the 304 stainless steel plate and the 45 steel plate are assembled with smooth surfaces, and an argon arc welding machine is used to spot weld the 45 steel plate and the 304 stainless steel plate around the contact area. The purpose of spot welding is to minimize the impact of oxidation and impurities on the interface while fixing the assembly. For the spot-welded assembly plate, an angle grinder is used to install a louver wheel to grind the other side of the 45 steel plate and use a blower to blow away the surface dust particles. To remove dust particles, use a vibration grinding belt to grind one side of the TA1 plate and use a blower to blow away the surface dust particles, then put the polished surface of the TA1 plate in contact with the 45 steel plate for assembly, use sealing steel bars to argon arc weld the surface of the TA1 plate and the surface of the 304 stainless steel plate around to completely seal the assembled sheet material, strengthen the welding of the vacuum interface at the short side strip with holes, use a vacuum pump and connect a vacuum gauge to vacuum the billet, and after the vacuum gauge reaches the predetermined vacuum degree, use an argon arc welder to seal and weld the vacuum interface to achieve a near vacuum inside the assembled billet, greatly reducing the probability of interface oxidation and improving the rolling bond strength. The shrinking edge design of the 45 steel plate based on the thermally induced arc surface effect makes the length and width of the assembled 45 steel plate smaller than that of the 304 stainless steel plate and the TA1 plate, and the assembly position is located in the center of the 304 stainless steel plate. After the shrinking edge billet is assembled, it is heated in an argon atmosphere box-type heating furnace. By utilizing the difference in thermal expansion coefficients of the three-layer metal 304 stainless steel plate, 45 steel plate and TA1 plate, a centripetal arc surface is spontaneously formed during the heating process, which directly promotes the closure of the interface gap. The residual inert gas from the welding is mechanically squeezed to the center of the billet by the arc structure and is completely discharged through the weld micropores at the sealing edge to eliminate the residual gas on the interface. The curved surface makes the interfaces of each layer fit precisely. After being taken out of the furnace, it is separated from the vacuum environment to form a closed space to avoid interface oxidation.

[0100] The wave-flat continuous rolling process of titanium / steel composite plates is that after the billet is taken out of the furnace, it is continuously subjected to one pass of corrugation rolling and two passes of flat rolling, so that the composite plate can achieve high-strength bonding of the corrugated interface.

[0101] The wave-flat continuous rolling process of titanium / steel composite plates is combined with the 45 steel edge reduction design based on the thermally induced arc surface effect. During rolling at a heating temperature of 850°C or above, the curved surface gradually flattens with rolling, continuously forming an extrusion effect on the interface, accelerating the diffusion of metal atoms, and ultimately achieving high-strength metallurgical bonding. The 45 steel edge reduction design effectively releases the deformation resistance caused by the uncoordinated deformation of the three layers of plate, improves the flatness of the composite plate after rolling, and the 45 steel edge reduction design enables 45 steel to fill the edge space of the titanium / steel / stainless steel composite plate during wave-flat rolling, reducing the probability of interface oxidation, improving the plate quality, and effectively reducing the damage to the welding strength of the titanium / steel / stainless steel composite plate assembly weld, thereby improving the rolling success rate and bonding strength. The above is the working process of this method.

[0102] After the blanks are assembled and heated, a heated and bent plate 9 is formed.

[0103] Based on the working process of this method, a theoretical model of edge shrinkage-heating bending-wave-flat rolling of titanium / steel / stainless steel composite plates is proposed. Its operation process is as follows.

[0104] Input composite plate size parameter μ TA1 (l x , l y ,γ1),μ 304 (l x , l y ,γ2),μ 45 =(Δl x , Δl y ,ε,γ3), where l x , l y is the length of both sides of TA1 and 304 stainless steel plate, Δl x , Δl y is the relative shrinkage of the 45 steel plate on both sides, ε is the shrinkage position parameter of the 45 steel plate, γ1 is the thickness of the TA1 plate, γ2 is the thickness of the 304 stainless steel plate, and γ3 is the thickness of the 45 steel plate. Finite element simulation is performed on the shrinkage titanium / steel / stainless steel composite plate to generate the initial composite plate internal stress σ0 and initial bending deflection ω0. The mapping relationship between the composite plate internal stress σ1 and bending deflection ω1 after heating is established:

[0105] ω1=(ω0,T,t,ρ TA1 , ρ 304 , ρ 45 )

[0106] σ1=(σ0,ω1,μ TA1 , μ 304 , μ 45 )

[0107] Where T is the heating temperature, t is the heating time, ρ TA1 , ρ 304 , ρ 45 The thermal expansion coefficients of the three layers of materials are input. The above parameters are input to perform finite element simulation on the heated titanium / steel / stainless steel composite plate, and the simulation results of the internal stress σ1 and bending deflection ω1 of the composite plate are output. If the simulation results do not meet the requirement that the internal stress σ1 is less than the rolling allowable stress [σ 轧制 ], the bending deflection ω1 is less than the allowable bending deflection [ω 轧制 ], then for T, t, μ TA1 、μ 304 、μ 45 Adjust the values ​​and re-enter the adjusted parameters for simulation. If the simulation results meet the requirements, the composite plate rolling simulation is performed. Input the composite plate rolling parameters F (rolling force), V (rolling speed), (rolling reduction), δ (corrugation roller parameters), ω1, σ1, perform finite element simulation on the heated titanium / steel / stainless steel composite plate to generate the shear strength τ, residual stress σ2, and bending deflection ω2 of the composite plate after rolling. If the simulation results are different and the internal stress σ2 is less than the allowable stress σ after rolling, 使用 , the bending deflection ω2 is less than the allowable bending deflection ω after rolling 使用 , the shear strength τ is greater than the allowable shear strength [τ], then adjust F, V, The δ value is re-entered into the adjusted parameter simulation. If the simulation results can simultaneously meet the requirements, the rolling process is terminated. This theoretical simulation model effectively predicts the technical parameters of titanium / steel / stainless steel composite plates in the entire process of billet assembly, heating, and rolling. A two-level feedback system is set up to adjust the input parameters in real time based on the simulation results. The response is timely and highly accurate, forming a prediction-feedback-adjustment mechanism, which has important guiding significance for the actual process of billet assembly, heating, and rolling of titanium / steel / stainless steel composite plates.

[0108] Application examples:

[0109] Currently, TA1 / 45 / 304 titanium / steel composite plates have been prepared using this method. The size of the TA1 plate before rolling is 1200*350*3mm. 3 ,45 steel plate size is 1000*310*8mm 3 , 304 stainless steel plate size is 1200*350*8mm 3. A series of performance tests were conducted on the rolled titanium / steel / stainless steel composite plates and the optimal rolling parameters were obtained. The use of an anti-oxidation titanium / steel / stainless steel composite plate assembly method based on the thermally induced arc surface effect and a wave-flat continuous rolling composite plate process to roll TA1 / 45 / 304 composite plates effectively avoided the problems of inconsistent sheet deformation, severe interface oxidation, large residual stress after rolling, and large bending deflection during traditional assembly and rolling. The rolling shear strength was finally achieved at a heating temperature of 850°C. After heating for 2 hours, the average shear strength of TA1 / 45 reached 335MPa, and the average shear strength of 45 / 304 reached 355MPa. The overall strength difference was small and the strength distribution was uniform. The shrinkage design of the middle layer 45 steel utilizes the difference in thermal expansion coefficients of the three layers of metal 304 stainless steel, 45 steel, and TA1 to spontaneously form a centripetal arc surface during the heating process, thereby constructing a synergistic mechanism of "thermal deformation-interface optimization-rolling efficiency enhancement". When a titanium / steel / stainless steel composite plate blank is heated, the three metal layers exhibit centripetal arcs due to their differential thermal expansion properties. This cross-section resembles a "smile curve," directly closing the interfacial gap. Residual inert gases from welding are mechanically squeezed toward the center of the blank by the arc structure, ultimately being completely expelled through the weld micropores at the sealed edge, eliminating any interfacial gas residue. The curved surface ensures precise alignment of the layers. After exiting the vacuum environment, the blank forms a naturally enclosed space, preventing interfacial oxidation. The stainless and titanium layers exert radial compressive stress on the 45 steel in the middle, strengthening interfacial contact through prestressing. This prestress effectively reduces deformation resistance, prioritizing core-interface bonding during the initial rolling process. During rolling at temperatures of 850°C and above, the curved surface gradually flattens, continuously compressing the interface and accelerating metal atomic diffusion, ultimately achieving a high-strength metallurgical bond. 45 steel edge reduction assembly effectively relieves deformation resistance caused by the mismatched deformation of the three layers, significantly improving the flatness of the composite plate after rolling. During the rolling process, 45 steel, being softer than 304 and TA1 steel, fills the margins of the titanium / steel / stainless steel composite plate, reducing the likelihood of interfacial oxidation and improving plate quality. This effectively reduces damage to the weld strength of the titanium / steel / stainless steel composite plate's weld seams, thereby increasing rolling success. 45 steel's edge-shrinking assembly effectively improves the overall mechanical properties of the titanium / steel / stainless steel composite plate. The assembly of the titanium / steel / stainless steel composite plate, which is sealed with edge strips on all sides and vacuum-welded at one end, effectively reduces the likelihood of interfacial oxidation and improves the weld strength of the titanium / steel / stainless steel composite plate's weld seams, thereby enhancing rolling success and bond strength. SEM and surface scanning of shear cross-sections reveal a large area of ​​Ti residue on the steel side and the formation of numerous shear dimples. Residual stress testing of the composite plate after rolling revealed a 30% reduction in the overall average residual stress of the composite plate produced using this method compared to conventional rolling methods. Furthermore, plate flatness is significantly improved compared to conventional rolling methods. Through experiments, it was found that this process is particularly suitable for metals with large deformation differences and hardness, such as TA1 and 304.Experiments have shown that the wave-flat continuous rolling composite plate process effectively releases residual stress, improves rolling flatness, reduces interface oxidation, promotes metallurgical bonding and mechanical bite between dissimilar metals at the bonding interface, reduces the generation of interface cracks and micropores, improves the overall bonding strength of titanium / steel / stainless steel composite plates, and also makes the final plate strength distribution uniform.

[0110] The prepared samples refer to the test sample 10 taken from the rolled plate, which includes the TA1 / 45 interface micromorphology SEM11 and the 45 / 304 interface micromorphology SEM12.

[0111] In this sample, the morphology of the shear dimple 14 can be seen from the side shear section 13 of the 45 steel. At the same time, the Fe distribution surface 15 of the shear section and the Ti distribution surface 16 of the shear section can be obtained through analysis.

[0112] The theoretical model of titanium / steel / stainless steel composite plate edge shrinkage-heating bending-wave-flat rolling is used to effectively predict the technical parameters of titanium / steel / stainless steel composite plates in the entire process of billet assembly-heating-rolling. A two-level feedback system is set up to adjust the input parameters in real time through simulation results. The response is timely and the prediction accuracy is high, forming a prediction-feedback-adjustment mechanism, which has important guiding significance for the actual titanium / steel / stainless steel composite plate in the billet assembly-heating-rolling process.

[0113] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0114] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for rolling an anti-oxidation composite plate based on a thermally induced cambered surface effect, characterized in that: include: Acquire composite plate processing data of 304 stainless steel plate (2), 45 steel plate (1) and TA1 plate (7); Acquiring the rolling data based on a functional relationship between the composite plate processing data and the rolling data; The composite plate processing data includes the size and relative position data and heating data of the 304 stainless steel plate (2), the 45 steel plate (1) and the TA1 plate (7); The 45 steel plate (1) is fixedly arranged in a closed chamber formed by splicing the 304 stainless steel plate (2) and the TA1 plate (7); The closed chamber is evacuated to form a composite board composite blank; The composite plate composite billet is put into a furnace for rolling; in, The size of the 45 steel plate (1) is smaller than that of the 304 stainless steel plate (2), and the sizes of the 304 stainless steel plate (2) and the TA1 plate (7) match each other.

2. The method for rolling an anti-oxidation composite plate based on the thermally induced cambered surface effect according to claim 1, characterized in that: The steps of fixing the 45 steel plate (1) in a sealed chamber formed by splicing the 304 stainless steel plate (2) and the TA1 plate (7) include: One side of the 45 steel plate (1) is fixed to the middle of the 304 stainless steel plate (2); The TA1 plate (7) is arranged on the other side of the 45 steel plate (1) and is fixed to the 304 stainless steel plate (2); The TA1 plate (7) and the 304 stainless steel plate (2) are sealed at their edges to form the sealed chamber.

3. The method for rolling an anti-oxidation composite plate based on the thermally induced cambered surface effect according to claim 2, characterized in that: The step of fixing one side of the 45 steel plate (1) to the middle of the 304 stainless steel plate (2) comprises: Grinding the contact surface between the 45 steel plate (1) and the 304 stainless steel plate (2), and fixing the edge of the 45 steel plate (1) and the surface of the 304 stainless steel plate (2) by spot welding; A plurality of welding points (3) arranged at intervals are formed between the 45 steel plate (1) and the 304 stainless steel plate (2).

4. The method for rolling an anti-oxidation composite plate based on the thermally induced cambered surface effect according to claim 2, characterized in that: The steps of arranging the TA1 plate (7) on the other side of the 45 steel plate (1) and fixing it to the 304 stainless steel plate (2) include: The contact surface between the 45 steel plate (1) and the TA1 plate (7) is polished, and the TA1 plate (7) is placed on the side of the 45 steel plate (1) away from the 304 stainless steel plate (2).

5. The method for rolling an anti-oxidation composite plate based on thermally induced cambered surface effect according to claim 1, characterized in that: The steps of sealing the edges of the TA1 plate (7) and the 304 stainless steel plate (2) to form the sealed chamber include: The 304 stainless steel plate (2) is coaxially aligned with the TA1 plate (7); Use a sealing long steel bar (6) to cover the long side edge between the 304 stainless steel plate (2) and the TA1 plate (7) and weld them to fix; A sealing short steel bar (8) is used to cover the short side edge between the 304 stainless steel plate (2) and the TA1 plate (7) and is welded and fixed.

6. The method for rolling an anti-oxidation composite plate based on the thermally induced cambered surface effect according to claim 5, characterized in that: The step of forming a composite board composite blank after the closed chamber is vacuumed comprises: One end of the vacuum steel pipe (5) is fixed on any of the sealing short steel bars (8), so that one end of the vacuum steel pipe (5) is connected to the closed chamber, and the closed chamber is evacuated after being connected to the other end of the vacuum steel pipe (5) using a vacuum equipment. After the vacuuming is completed, the vacuum interface of the vacuum steel pipe (5) is sealed and welded using an argon arc welding machine.

7. The method for rolling an anti-oxidation composite plate based on thermally induced cambered surface effect according to claim 1, characterized in that: The step of feeding the composite plate composite billet into the furnace for rolling comprises: After the composite board is assembled, it is placed in an argon atmosphere box-type heating furnace for heating.

8. The method for rolling an anti-oxidation composite plate based on the thermally induced cambered surface effect according to claim 1, characterized in that: After the composite plate composite billet is put into the furnace for rolling, the method further comprises: After being taken out of the furnace, the composite plate composite billet is continuously subjected to one pass of corrugation rolling and two passes of flat rolling.

9. The method for rolling an anti-oxidation composite plate based on thermally induced cambered surface effect according to claim 1, characterized in that: The step of obtaining composite plate processing data of the 304 stainless steel plate (2), the 45 steel plate (1) and the TA1 plate (7) comprises: Based on the simulation model, the initial composite plate internal stress and initial bending deflection are obtained according to the size and relative position data of the 304 stainless steel plate (2), the 45 steel plate (1) and the TA1 plate (7); Obtaining the post-heating bending deflection based on a functional relationship of the post-heating bending deflection, the initial bending deflection, a set heating temperature, a set heating time, the thermal expansion coefficient of the 45 steel plate (1), the thermal expansion coefficient of the 304 stainless steel plate (2), and the thermal expansion coefficient of the TA1 plate (7); Obtaining the internal stress of the composite plate after heating based on a functional relationship among the internal stress of the composite plate after heating, the initial internal stress of the composite plate, the bending deflection after heating, the thermal expansion coefficient of the 45 steel plate (1), the thermal expansion coefficient of the 304 stainless steel plate (2), and the thermal expansion coefficient of the TA1 plate (7); When it is determined that the internal stress of the composite plate after heating satisfies the condition that the internal stress of the composite plate after heating is less than the allowable stress during rolling, and the bending deflection after heating satisfies the condition that the bending deflection after heating is less than the allowable bending deflection during rolling, the current size and relative position data and heating data of the 304 stainless steel plate (2), 45 steel plate (1) and TA1 plate (7) are selected as the composite plate processing data.

10. The method for rolling an anti-oxidation composite plate based on thermally induced cambered surface effect according to claim 9, characterized in that: The step of obtaining the rolling data based on the functional relationship between the composite plate processing data and the rolling data comprises: Based on the simulation model, the shear strength, residual stress and bending deflection of the composite plate are obtained according to the rolling force, rolling speed, rolling reduction, corrugation roller parameters, the internal stress of the composite plate after heating and the bending deflection after heating; When it is determined that the shear strength of the composite plate satisfies that the shear strength of the composite plate is greater than the allowable shear strength, the residual stress satisfies that the residual stress is less than the allowable stress after rolling, and the bending deflection satisfies that the allowable stress after rolling is less than the allowable bending deflection after rolling, the rolling force, the rolling speed, the rolling reduction and the corrugated roller parameters are selected as the rolling data.

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