Inclined shearing connection method for metal plates

Abstract

The invention discloses a metal plate inclined shearing connection method, and relates to the technical field of metal plate connection, the connection method comprises the following steps: S1, determining materials and sizes of two metal plates; s2, finite element simulation is conducted according to the material attributes of the two metal plates and the sizes of the plates, and the optimal slope of the contact face side of the shear blade and the plates is determined; s3, shear blade machining; and S4, shearing and connecting the two metal plates on the shearing and connecting device. By adopting inclined shearing, the section shape of the sheared metal plate is improved, and rapid and effective connection of the two metal plates is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of metal plate connection, and relates to a metal plate inclined shear connection method. Background Art

[0002] There are two ways to achieve headless rolling: continuous casting and rolling and slab head-to-tail connection. However, the cost of continuous casting and rolling equipment is high, and the head-to-tail connection of slabs is currently mainly based on welding. However, the current welding method has disadvantages such as high energy consumption, low efficiency, long welding connection time, and large equipment size, which to a certain extent limits the efficiency of the headless rolling process. Someone has studied and developed a slab rapid extrusion solid-state connection technology, which is a technology that achieves solid-state connection of slabs through rapid shearing and extrusion at high temperature. The slab rapid shearing and extrusion solid-state connection technology is: under the shearing action of the upper and lower shears, the overlapped high-temperature steel billet undergoes shearing, extrusion, and upsetting violent deformation. After shearing, the two slabs are instantly solid-state connected.

[0003] However, this technology will form a joint on the upper and lower surfaces of the slab after connection, and the joint needs to be cut off during the subsequent rolling process, which increases the time cost. A new metal shear connection method is introduced based on this technology. The specific process is as follows Figure 6 As shown in the figure, under this shear connection mode, the slabs can be connected, and there is no joint on the upper and lower surfaces of the connected slabs. The state of the metal plates after shearing with ordinary shear blades is shown in Figure 3(a). When the connection is made in this state, the shear blade is perpendicular to the plate surface, resulting in a collapsed angle of the plate after shearing fracture, which is not conducive to the subsequent connection of the cross-sectional inclination. When the upper and lower metal plate cross-sections contact, local extrusion deformation occurs, and the effective connection area becomes smaller. The specific connection surface after the connection is completed is shown in Figure 3(b). The effective connection area of ​​the two slabs is not very high. Summary of the invention

[0004] In view of the above problems, the present invention provides a method for connecting metal plates by inclined shearing. The present invention changes the inclination direction of the cross-section of the metal plate after shearing through inclined shearing, and makes the metal plate rotate a certain angle during the subsequent movement process, which is more conducive to the combination of the metal plates in the subsequent connection process and improves the combination quality. In addition, since the metal plate is placed at an angle during the shearing process, the shear force required for the shearing process can be reduced.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A metal plate inclined shear connection method comprises the following steps: S1. Determine the material and size of the two metal plates; S2. Perform finite element simulation based on the material properties of the two metal plates and the plate sizes to determine the optimal slope of the contact surface between the shear blade and the plate; S3. Processing shear blade; S4. Perform shear connection on two metal plates on a shear connection device.

[0006] Furthermore, the inclination of the contact surface between the shear blade and the plate can be simulated by finite element method through Deform. The inclination of the contact surface between the shear blade and the plate is determined by observing the fracture shape of the plate after shearing. The plate is set as an elastic-plastic body. Since the shearing process involves the fracture of the plate, damage must be set in the software. Therefore, it is necessary to select a fracture criterion and calculate the damage value of the material. The fracture criterion selected is the Normalized c&l criterion.

[0007] Furthermore, different materials have different damage values, which need to be calculated according to the criteria. The Normalized c&l criterion formula is: . Where C1 is the critical failure value of the material, is the equivalent strain, is the maximum principal stress, is the equivalent strain, when f =C1, the material is considered to have broken.

[0008] Furthermore, the shear connection device in S4 comprises an upper shear blade 1, an upper metal plate, an upper shear blade 2, a lower metal plate, a supporting plate, a left side plate, a left support, a right support, a right side plate, a pressing plate, a lower shear blade 1 and a lower shear blade 2. The upper metal plate and the lower metal plate are arranged in the shear connection device in parallel and obliquely. The upper shear blade 1 moves together with the right support. With the movement of the upper shear blade 1, the upper metal plate is sheared. After shearing, the left side of the upper metal plate moves downward with the movement of the upper shear blade 1. At the same time, the gap between the upper shear blade 1 and the upper shear blade 2 becomes smaller, driving the left side of the upper metal plate to rotate clockwise. After the gap between the upper shear blade 1 and the upper shear blade 2 disappears, the upper shear blade 1 drives the left side of the upper metal plate to rotate clockwise. The upper shear blade 2 shears the lower metal plate under the joint action of the lower shear blade 2, and the lower shear blade 2 remains stationary. After the shearing is completed, the right support has reached the maximum stroke and begins to drive the pressure plate to move downward. The pressure plate drives the lower shear blade 1 to move downward, and the gap between the lower shear blade 1 and the lower shear blade 2 becomes smaller. The right side of the lower metal plate rotates clockwise. After the rotation is completed, the upper shear blade 1 drives the left side of the metal plate and the upper shear blade 2 to move downward together. The left side of the upper metal plate moves to the same horizontal position as the right side of the lower metal plate, and the support plate and the left support move downward with the left side of the lower metal plate. At the same time, the left side of the upper metal plate and the right side of the lower metal plate are contacted and extruded under the joint action of the left plate and the right side plate to achieve connection.

[0009] Furthermore, supports and supports are respectively provided below the support plate and above the pressure plate, and the supporting force that can be provided is 1.1-1.5 times the weight of the support plate and the pressure plate.

[0010] Furthermore, during the connection process of the upper metal plate and the lower metal plate after the inclined shearing, the thickness direction of the upper metal plate and the lower metal plate when they are in contact and connected should be parallel to the movement direction of the upper shear blade.

[0011] Furthermore, the structure of the shear connection device in S4 should be centrally symmetrical to ensure that the stress states of the two metal plates are the same during the shear connection process, and that the fracture shapes of the two metal plates after shearing are the same.

[0012] The advantages of the present invention are as follows: (1) The present invention changes the inclination direction of the metal plate after shearing through inclined shearing, and makes the metal plate rotate a certain angle during the subsequent movement process, which is more conducive to the combination of the metal plate in the subsequent connection process and improves the combination quality. In addition, since the metal plate is placed at an angle during the shearing process, the shear force required for the shearing process can be reduced; (2) The present invention improves the state of the plate after shearing, improves the shearing quality, reduces the shear force, and is conducive to the combination of the plate during the connection process by adopting inclined shearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a flow chart of the metal inclined shear connection method of the present invention; Figure 2 This is a schematic structural diagram of the metal inclined shear connection device of the present invention; Figure 3 (a) is a diagram showing the connection state of the plates after shearing by ordinary shear blades; FIG3 (b) is a diagram showing the specific connection surface state after the connection of the plates is completed by ordinary shear blade shearing; FIG4 (a) is a diagram showing the connection state of the plates after inclined shearing according to the present invention; FIG4( b ) is a diagram showing a specific connection surface state after the inclined shear plate is connected; Figure 5 This is a finite element software modeling diagram of the present invention; Figure 6 This is a schematic diagram of a common metal shear connection; Figure 7 This is a physical picture of the metal inclined shear connection device of the present invention; Figure 8 It is the stress-strain curve of Al5052; Figure 9 (a) is a schematic diagram of the shearing result of a common shear blade; FIG9( b ) is a schematic diagram of the inclined shearing result of the present invention; Fig.10 It is a schematic diagram of the shearing process of the present invention; Fig.11 This is the result diagram of the ordinary shear connection; Fig.12 This is a diagram of the inclined shear connection results of the present invention.

[0014] In the figure: 1-upper shear blade one; 2-upper metal plate, 3-upper shear blade two; 4-lower metal plate; 5, support plate; 6-left side plate; 7-left support; 8-right support; 9-right side plate; 10-pressing plate; 11-lower shear blade one; 12-lower shear blade two. DETAILED DESCRIPTION

[0015] The technical scheme in the embodiment of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiment of the present invention. Based on the implementation examples in the present invention, all other implementation examples obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by technicians in the field to which the present invention belongs. Example:

[0016] like Figure 1 A metal plate inclined shear connection method is shown, comprising the following steps: S1. Determine the material and size of the two metal plates: the size of the two metal plates is 60*50*5mm, and the material is Al5052.

[0017] S2. Perform finite element simulation based on the material properties and plate size of the two metal plates to determine the optimal slope between the shear blade and the contact surface of the plate. In order to determine the optimal slope between the shear blade and the contact surface of the plate, it is necessary to perform finite element simulation on the inclined shearing process of the plate. Before simulation, the stress-strain curve of the test material needs to be determined. Figure 8 This is the tensile stress-strain curve of Al5052.

[0018] The inclination of the contact surface between the shear blade and the plate can be simulated by Deform through finite element simulation. The inclination of the contact surface between the shear blade and the plate is determined by observing the fracture shape of the plate after shearing. The plate is set as an elastic-plastic body. Since the shearing process involves the fracture of the plate, damage must be set in the software, so it is necessary to select a fracture criterion and calculate the damage value of the material. The fracture criterion selected is the Normalized c&l criterion.

[0019] Different materials have different damage values, which need to be calculated according to the criteria. The Normalized c&l criterion formula is: . Where C1 is the critical failure value of the material, is the equivalent strain, is the maximum principal stress, is the equivalent strain, when f=C1, the material is considered to have broken. The yield strength of Al5052 is measured to be 172MPa, the maximum principal stress is 240MPa, the equivalent effect at fracture is 0.227, the stress-strain curve is σ=150ξ^0.16, and the critical damage factor C1=0.54 can be obtained by integrating the formula.

[0020] Modeling in software Figure 5 As shown, the plate is set as an elastic-plastic body, and the rest are set as rigid bodies. The simulation results are shown in Figure 9, where Figure 9(a) is the shearing result of the ordinary shear blade, and Figure 9(b) is the metal inclined shearing effect, where the slope of the optimal shear blade and the contact surface of the plate is 10° S3. Processing shear blade; S4. Place the processed shear blade into the shear connection device, and perform shear connection on the two metal plates on the shear connection device.

[0021] like Figure 2 and Figure 7 As shown, the shear connection device includes an upper shear blade 1, an upper metal plate 2, an upper shear blade 2 3, a lower metal plate 4, a supporting plate 5, a left side plate 6, a left support 7, a right support 8, a right side plate 9, a pressing plate 10, a lower shear blade 1 11 and a lower shear blade 2 12. The upper metal plate 2 and the lower metal plate 4 are arranged in parallel and inclined in the shear connection device. The upper shear blade 1 moves with the right support 8. With the movement of the upper shear blade 1, the upper metal plate 2 is sheared. After shearing, the left side of the upper metal plate 2 moves downward with the movement of the upper shear blade 1. At the same time, the gap between the upper shear blade 1 and the upper shear blade 2 3 becomes smaller, driving the left side of the upper metal plate 2 to rotate clockwise. After the gap between the upper shear blade 1 and the upper shear blade 2 3 and the left side of the upper metal plate 2 disappears, the upper shear blade 1 drives the left side of the upper metal plate 2 to rotate with the upper shear blade 1. The shear blade 2 3 shears the lower metal plate under the joint action of the lower shear blade 2 12, and the lower shear blade 2 12 remains stationary. After the shearing is completed, the right support 8 has reached the maximum stroke and begins to drive the pressure plate 10 to move downward. The pressure plate 10 drives the lower shear blade 1 1 to move downward, and the gap between the lower shear blade 1 1 and the lower shear blade 2 12 becomes smaller. The right side of the lower metal plate 4 rotates clockwise. After the rotation is completed, the upper shear blade 1 drives the left side of the upper metal plate 2 and the upper shear blade 2 3 to move downward together. The left side of the upper metal plate 2 moves to the same horizontal position as the right side of the lower metal plate 4, and the support plate 5 and the left support 7 move downward with the left side of the lower metal plate 4. At the same time, the left side of the upper metal plate 2 and the right side of the lower metal plate 4 are contacted and extruded under the joint action of the left plate 6 and the right side plate 9 to achieve connection.

[0022] Supports 7 and 8 are respectively arranged below the support plate 5 and above the pressing plate 10 , and can provide a supporting force of 1.1-1.5 times the weight of the support plate 5 and the pressing plate 10 .

[0023] After the inclined shearing, during the connection process, the thickness direction of the upper metal plate 2 and the lower metal plate 4 when they are in contact and connected should be parallel to the movement direction of the upper shear blade 1.

[0024] The structure of the shear connection device should be centrally symmetrical to ensure that the stress states of the two metal plates are the same during the shear connection process, and that the fracture shapes of the two metal plates after shearing are the same.

[0025] Ordinary shear connection, the experimental results are as follows Fig.11 As shown; the inclined shear connection result adopted by the present invention is as follows Fig.12 As shown, it can be seen that the connection area of ​​the plates connected by the present invention has been greatly improved, and the shear connection process has been improved. In summary, the present invention changes the state of the plates after shearing by obliquely shearing the plates and completing the connection, making it more conducive to subsequent connection, improving the overlap rate of the shear connection, and reducing the shear force during the shearing process.

[0026] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for oblique shear connection of metal sheets, characterized in that: The following steps are involved: S1. Determine the material and size of the two metal plates; S2. Perform finite element simulation based on the material properties of the two metal plates and the size of the plates to determine the optimal slope of the contact surface between the shear blade and the plate; S3. Processing shear blade; S4. Perform shear connection on two metal plates on a shear connection device.

2. According to the inclined shear connection method of metal plates described in claim 1, the inclination of the shear blade and the contact surface side of the plate can be simulated by finite element method through Deform, and the inclination of the shear blade and the contact surface side of the plate is determined by observing the fracture shape of the plate after shearing. The plate is set as an elastic-plastic body. Since the shearing process involves the fracture of the plate, damage must be set in the software, so it is necessary to select a fracture criterion and calculate the damage value of the material. The fracture criterion uses the Normalized c&l criterion.

3. The metal sheet inclined shear connection method according to claim 2, characterized in that: Different materials have different damage values, which need to be calculated according to the criteria. The Normalized c&l criterion formula is: . Where C1 is the critical failure value of the material, is the equivalent strain, is the maximum principal stress, is the equivalent strain, when f =C1, the material is considered to have broken.

4. The metal sheet inclined shear connection method according to claim 3, characterized in that: The shear connection device in S4 comprises an upper shear blade (1), an upper metal plate (2), an upper shear blade (3), a lower metal plate (4), a support plate (5), a left side plate (6), a left support (7), a right support (8), a right side plate (9), a pressure plate (10), a lower shear blade (11) and a lower shear blade (12). The upper metal plate (2) and the lower metal plate (4) are arranged in parallel and inclined in the shear connection device. The upper shear blade (1) and the right support (8) are connected to each other. The upper metal plate (2) starts to move, and as the upper shear blade (1) moves, the upper metal plate (2) is sheared under the joint action of the upper shear blade (1) and the lower shear blade (11). After shearing, the left side of the upper metal plate (2) moves downward along with the movement of the upper shear blade (1), and at the same time, the gap between the upper shear blade (1) and the upper shear blade (3) becomes smaller, driving the left side of the upper metal plate (2) to rotate clockwise. After the gap between the upper shear blade (1) and the upper shear blade (3) disappears, the upper shear blade (1) moves downward. ) drives the left side of the upper metal plate (2) and the upper shear blade (2) (3) to shear the lower metal plate (4) under the joint action of the lower shear blade (12), and the lower shear blade (12) remains stationary. After the shearing is completed, the right support (8) has reached the maximum stroke and begins to drive the pressure plate (10) to move downward. The pressure plate (10) drives the lower shear blade (1) (11) to move downward. The gap between the lower shear blade (11) (11) and the lower shear blade (12) becomes smaller, and the right side of the lower metal plate (4) rotates clockwise. After the rotation is completed, the upper shear blade (1) drives the left side of the metal plate (2) and the upper shear blade (3) to move downward together. The left side of the upper metal plate (2) moves to the same horizontal position as the right side of the lower metal plate (4). The support plate (5) and the left support (7) move downward with the left side of the lower metal plate (4). At the same time, the left side of the upper metal plate (2) and the right side of the lower metal plate (4) are contacted and squeezed under the joint action of the left plate (6) and the right plate (9) to achieve connection.

5. The metal sheet inclined shear connection method according to claim 4, characterized in that: A support (7) and a support (8) are respectively arranged below the support plate (5) and above the pressure plate (10), and can provide a supporting force of 1.1 to 1.5 times the weight of the support plate (5) and the pressure plate (10).

6. The metal sheet inclined shear connection method according to claim 5, characterized in that: After the inclined shearing, during the connection process, the thickness direction of the upper metal plate (2) and the lower metal plate (4) when they are in contact and connected should be parallel to the movement direction of the upper shear blade (1).

7. The metal sheet inclined shear connection method according to claim 1, characterized in that: The structure of the shear connection device in S4 should be centrally symmetrical to ensure that the stress states of the two metal plates are the same during the shear connection process, and the fracture shapes of the two metal plates after shearing are the same.

Images