A metal plate inclined shear connection method

Abstract

The present invention discloses a method for connecting metal sheets by inclined shearing, which relates to the technical field of metal sheet connection. The method comprises the following steps: S1. Determining the material and dimensions of two metal sheets; S2. Performing finite element simulation based on the material properties and dimensions of the two metal sheets to determine the optimal inclination of the shear blades and the contact surfaces of the sheets; S3. Processing the shear blades; and S4. Shearing the two metal sheets together using a shearing connection device. By employing inclined shearing, the present invention improves the cross-sectional shape of the metal sheets after shearing, facilitating the rapid and efficient connection of the two metal sheets.

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] Headless rolling can be achieved through two methods: continuous casting and rolling, and slab head-to-tail connection. However, continuous casting and rolling equipment is expensive, and welding is currently the main method for connecting slab heads and tails. 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. Some people have researched 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 as follows: under the shearing action of the upper and lower shears, the overlapped high-temperature steel billets undergo 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 time cost. A new metal shear connection method has been introduced based on this technology. The specific process is as follows Figure 6 As shown in the figure, under this shear connection method, the slabs can be connected, and no joints are produced 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 section inclination. When the upper and lower metal plate 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 response to 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 plates are 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:

[0006] A method for connecting metal plates by inclined shearing, comprising the following steps:

[0007] S1. Determine the material and size of the two metal plates;

[0008] S2. Perform finite element simulation based on the material properties and dimensions of the two metal plates to determine the optimal slope of the shear blade in contact with the plate;

[0009] S3. Processing shear blade;

[0010] S4. Perform shear connection on two metal plates using a shear connection device.

[0011] Furthermore, the inclination of the contact surface between the shear blade and the plate can be simulated by finite element method using 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 needs to 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.

[0012] 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, Equivalent strain, is the maximum principal stress, is the equivalent strain, when f =C1, the material is considered to have broken.

[0013] Furthermore, the shear connection device in S4 includes 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 parallel and tilted in the shear connection device. The upper shear blade 1 moves together with the right support. As the upper shear blade 1 moves, 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 and 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 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.

[0014] Furthermore, a left support and a right support are respectively provided below the supporting plate and above the pressing plate, and the supporting force that can be provided is 1.1-1.5 times the weight of the supporting plate and the pressing plate.

[0015] Furthermore, during the connection process of the upper and lower metal plates after the inclined shearing, the thickness direction of the upper and lower metal plates when they are in contact and connected should be parallel to the movement direction of the upper shear blade.

[0016] Furthermore, the structure of the shear connection device in S4 should be centrosymmetrical 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.

[0017] The advantages of the present invention are as follows: (1) The present invention changes the inclination direction of the metal plate after shearing by 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 by adopting inclined shearing, improves the shearing quality, reduces the shear force, and is conducive to the combination of the plate during the connection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a flow chart of the metal inclined shear connection method of the present invention;

[0019] Figure 2 This is a schematic structural diagram of the metal inclined shear connection device of the present invention;

[0020] Figure 3 (a) shows the plate connection state after shearing by ordinary shear blades;

[0021] Figure 3 (b) shows the specific connection surface state diagram after the common shear blade shears the plate to be connected;

[0022] Figure 4 (a) is a diagram showing the plate connection state after inclined shearing according to the present invention;

[0023] FIG4 (b) is a diagram showing the specific connection surface state after the inclined shear plate is connected;

[0024] Figure 5 This is the finite element software modeling diagram of the present invention;

[0025] Figure 6 This is a schematic diagram of a common metal shear connection;

[0026] Figure 7 This is a physical diagram of the metal inclined shear connection device of the present invention;

[0027] Figure 8 is the stress-strain curve of Al5052;

[0028] Figure 9 (a) is a schematic diagram of the shearing results of ordinary shear blades;

[0029] Figure 9 (b) is a schematic diagram of the inclined shearing result of the present invention;

[0030] Figure 10 Schematic diagram of the shearing process of the present invention;

[0031] Figure 11 This is the result diagram of ordinary shear connection;

[0032] Figure 12 This is the result diagram of the inclined shear connection of the present invention.

[0033] In the figure: 1-upper shear blade 1; 2-upper metal plate, 3-upper shear blade 2; 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 1; 12-lower shear blade 2. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the implementation examples in the present invention, all other implementation examples obtained by ordinary technicians in this field without making 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.

[0035] Example:

[0036] like Figure 1 A metal plate inclined shear connection method is shown, comprising the following steps:

[0037] 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.

[0038] S2. Perform finite element simulation based on the material properties and plate dimensions of the two metal plates to determine the optimal inclination of the shear blade and the contact surface of the plate. To determine the optimal shear blade dimensions and inclination of the shear blade and the contact surface of the plate, perform finite element simulation of the plate inclined shearing process. Before simulation, the stress-strain curve of the test material must be obtained. Figure 8 This is the tensile stress-strain curve of Al5052.

[0039] The slope of the contact surface between the shear blade and the plate can be simulated by finite element analysis using Deform. The slope 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 plate fracture, damage must be set in the software. Therefore, a fracture criterion must be selected and the material damage value must be calculated. The fracture criterion used is the Normalized c&l criterion.

[0040] 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, Equivalent strain, is the maximum principal stress, is the equivalent strain, when f =C1, the material is considered to have fractured. 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.

[0041] 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) shows the shearing result of the ordinary shear blade and Figure 9(b) shows the metal inclined shearing effect. The optimal shear blade has a slope of 10° on the contact surface of the plate.

[0042] S3. Processing shear blade;

[0043] S4. Place the processed shear blade into a shear connection device, and perform shear connection on the two metal plates on the shear connection device.

[0044] like Figure 2 and Figure 7As 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 vertically and parallelly and obliquely in the shear connection device. The upper shear blade 1 moves together with the right support 8. As the upper shear blade 1 moves, 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 shearing blade 2 3 shears the lower metal plate under the joint action of the lower shearing blade 2 12, and the lower shearing 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 shearing blade 1 11 to move downward. The gap between the lower shearing blade 1 11 and the lower shearing blade 2 12 becomes smaller, and the right side of the lower metal plate 4 rotates clockwise. After the rotation is completed, the upper shearing blade 1 drives the left side of the upper metal plate 2 and the upper shearing 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 squeezed under the joint action of the left plate 6 and the right plate 9 to achieve connection.

[0045] A left support 7 and a right support 8 are respectively provided below the supporting plate 5 and above the pressing plate 10 , and can provide a supporting force of 1.1-1.5 times the weight of the supporting plate 5 and the pressing plate 10 .

[0046] After the inclined shearing, the upper metal plate 2 and the lower metal plate 4 are connected. 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.

[0047] The structure of the shear connection device should be centrally symmetrical to ensure that the two metal plates are subjected to the same stress during the shear connection process, and that the fracture shapes of the two metal plates after shearing are the same.

[0048] Ordinary shear connection, the experimental results are as follows Figure 11 As shown; the inclined shear connection results used in the present invention are as follows Figure 12 As shown, the present invention significantly increases the connection area of ​​the plates connected by the present invention, improving the shear connection process. In summary, the present invention changes the state of the plates after shearing by obliquely shearing and completing the connection, making it more conducive to subsequent connection, increasing the overlap rate of the shear connection, and reducing the shear force during the shearing process.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for connecting metal sheets by inclined shearing, 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 and dimensions of the two metal plates to determine the optimal slope of the shear blade in contact with the plate; S3. Processing shear blade; S4. Shear-connecting the two metal plates on the shear connection device; 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 tilted in the shear connection device. The upper shear blade (1) and the right support (8) are arranged in parallel and tilted in the shear connection device. The upper metal plate (2) is sheared by 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). 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 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 (11) to move downward. The gap between the lower shear blade 1 (11) and the lower shear blade 2 (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 (1) drives the left side of the 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). 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 in contact and squeezed under the joint action of the left plate (6) and the right plate (9) to achieve connection; After the inclined shearing, the upper metal plate (2) and the lower metal plate (4) are connected so that the thickness direction of the upper metal plate (2) and the lower metal plate (4) when they are in contact and connected is parallel to the movement direction of the upper shear blade (1).

2. According to the inclined shear connection method for metal sheets described in claim 1, the inclination of the contact surface between the shear blade and the sheet can be simulated by finite element method using Deform. The inclination of the contact surface between the shear blade and the sheet is determined by observing the fracture shape of the sheet after shearing. The sheet is set as an elastic-plastic body. Since the shearing process involves the fracture of the sheet, damage needs to 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.

3. The metal plate 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, Equivalent strain, is the maximum principal stress, is the equivalent strain, when f =C1, the material is considered to have broken.

4. The metal plate inclined shear connection method according to claim 3, characterized in that: A left support (7) and a right support (8) are respectively provided below the support plate (5) and above the pressure plate (10), and can provide a supporting force of 1.1-1.5 times the weight of the support plate (5) and the pressure plate (10).

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

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