Novel shear blade structure for improving shearing quality, shearing device and shearing method

Abstract

The invention discloses a novel shear blade structure for improving shearing quality, a shearing device and a shearing method, and relates to the technical field of shearing. Different from an existing shear blade structure which is used for shearing plates once, the shear blade structure is provided with two shear blades which are used for shearing the plates respectively. When the structure is used for shearing, a plate is firstly sheared for the first time through the first shear blade, and then is sheared for the second time through the second shear blade. And the second shear blade performs secondary shearing on the plate, so that the collapse angle can be reduced, and the shearing quality is further improved. And in addition, the plate is subjected to secondary shearing, so that higher shearing quality can be obtained under a larger gap. And due to two-pass shearing, the shearing gap of the first pass can be larger, the required shearing force is smaller, and the shearing part of the second pass is smaller, so that the shearing force is also lower. According to the plate shearing machine, secondary shearing is conducted on plates, the shearing force is reduced, and meanwhile the shearing quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of shearing, and relates to a novel shear blade structure, a shearing device and a shearing method for improving shearing quality. Background Art

[0002] With the rapid development of social economy, information technology, etc., technological equipment has been spawned. This shows that the current metal industry is facing an increasingly fierce market environment, which has put forward higher requirements for the management of medium and thick plate rolling finishing and shearing. At the same time, the management of medium and thick plate rolling finishing and shearing has also achieved qualitative development, showing new characteristics in various aspects such as materials in the metal pressure processing industry, geology and foundation of metal shearing production lines, design of metal shearing production lines, processing and shearing of metal shearing production lines.

[0003] Shearing defects mainly include uneven shearing section, misaligned blades, bosses, etc. The shearing quality has a great impact on the quality of the plate. When the defects exceed the standard, the plate needs to be resized or scrapped. When defects occur, the plate needs to be processed, which increases time and labor costs. Therefore, the parameters that affect the shearing quality during the shearing process must be controlled and improved to improve the shearing quality. The main problem affecting the shearing quality is that the double-sided shear lacks measures to quickly adjust the shear blade gap. There will be a certain gap between the upper and lower shear blades during the shearing process. The existence of this gap will cause the plate to have a certain collapse angle after shearing, resulting in poor shearing section and quality of the plate. Summary of the invention

[0004] In response to the above problems, the technical solution adopted by the present invention is: a new shear blade structure for improving shearing quality, including a shear blade body and a boss, the shear blade body is provided with a boss, the shear blade body and the boss form a stepped structure, the shear blade body is used for the first shearing pass, and the boss is used for the second shearing pass.

[0005] Furthermore, the height direction of the boss should be perpendicular to the shearing direction.

[0006] Furthermore, it is necessary to perform finite element simulation through Deform according to the material and size of the plate to be sheared, and to confirm the height of the boss by comparing the shear quality results under different boss heights of the finite element.

[0007] Furthermore, the plate to be sheared is set as an elastic-plastic body in the finite element simulation, and the fracture criterion is the Normalized c&l criterion.

[0008] A shearing device for improving shearing quality comprises a supporting plate, a test piece, an upper shearing blade, a pressing plate and a lower shearing blade. The lower shearing blade is located below the test piece, and the pressing plate and the upper shearing blade are located above the test piece.

[0009] Furthermore, the specific structure of the upper shear blade is set to the above-mentioned shear blade structure.

[0010] A shearing method for improving shearing quality comprises the following steps: Step 1: Determine the sheet material and sheet size; Step 2: Perform finite element simulation based on the material properties and size of the sheet to be sheared to determine the optimal shear blade boss size; Step 3: Processing the cutting edge; Step 4: Perform a shearing experiment in a shearing device; Furthermore, in step 4, the plate to be sheared is subjected to secondary shearing: the plate is sheared in the first pass; and the collapse angle produced by the first shearing is reduced in the second pass.

[0011] The beneficial effects of the present invention are as follows: (1) Different from the existing shear blade structure that performs one shear on the plate, the shear blade structure of the present invention has two shear blades, which shear the plate separately. When shearing, the structure first shears the plate for the first time through the first shear blade, and then shears the plate for the second time through the second shear blade. The second shearing of the plate by the second shear blade can reduce the collapse angle, thereby improving the shearing quality. By performing the secondary shearing on the plate, a higher shearing quality can be obtained under a larger gap; (2) Compared with ordinary shear blades, since the present shear blade adopts multi-pass shearing, since the first shearing gap is larger, the shearing force required for the first pass is smaller than that required for the ordinary shear blade, and the shearing force required for the second pass is much smaller than the shearing force required for the first pass, and the boss structure can reduce the collapse angle caused by the first shearing when performing the secondary shearing on the plate, making the cross section straighter, which not only reduces the shearing force but also improves the shearing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A flow chart of a shearing method for improving shearing quality according to the present invention; Figure 2 A novel shear blade structure for improving shearing quality in the present invention; FIG3 is a schematic diagram of sheet shearing when the boss height is too large; FIG4 is a schematic diagram of plate shearing when the boss height is too small; Fig. 5 is a schematic diagram of a shearing section of a common shearing blade; Figure 6 is a schematic diagram of the shearing device structure; Figure 7 It is the stress-strain curve of Al5052; Figure 8 Modeling diagram for finite element; FIG9 is a diagram showing finite element simulation results of a conventional shear blade and a shear blade of the present invention; Figure 10 is a comparison chart of shearing results.

[0013] Figure numerals: 1. support plate; 2. test piece; 3. upper shear blade; 4. pressing plate; 5. lower shear blade. DETAILED DESCRIPTION

[0014] 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

[0015] like Figure 2 A new shear blade structure for improving shearing quality is shown, comprising a shear blade body and a boss, wherein the shear blade body is provided with a boss, and the shear blade body and the boss form a stepped structure, wherein the shear blade body is used for the first shearing pass, and the boss is used for the second shearing pass; the height direction of the boss should be perpendicular to the shearing direction; finite element simulation should be performed through Deform according to the material and thickness of the plate to be sheared, and the height of the boss can be confirmed by comparing the shearing quality results under different boss heights of the finite element; the plate to be sheared is set as an elastic-plastic body in the finite element simulation, and the fracture criterion uses the Normalized c&l criterion, and the optimal shear blade boss height can be obtained through the simulation results.

[0016] The height of the boss should be determined according to the material and thickness of the plate to be sheared. The height should be neither too large nor too small. If the height of the boss is too large, it will cause the state shown in Figure 3(a). The gap will be too large during the first shearing, which will cause the collapse angle after shearing to be too large. In the second shearing, only the upper half of the plate will be sheared, as shown in Figure 3(b), and the purpose of improving the shearing quality cannot be achieved. If the height of the boss is too small, as shown in Figure 4(a), the state shown in Figure 4(b) will appear during the second shearing, which is not much different from the shearing result of ordinary shear blades. Ordinary shear blades shearing is as shown in Figure 4(b). Figure 5(a) , 5(b) As shown, the purpose of improving the shearing quality cannot be achieved.

[0017] like Figure 6 As shown, a shearing device for improving shearing quality includes a support plate 1, a specimen 2, an upper shearing blade 3, a pressing plate 4, and a lower shearing blade 5. The support plate 1 and the lower shearing blade 5 are located below the specimen 2, the pressing plate 4 and the upper shearing blade 3 are located above the specimen 2, and the upper shearing blade 3 is the shearing blade structure mentioned above. When in use, the upper shearing blade 3 and the lower shearing blade 5 shear the specimen 2, and the pressing plate 4 applies pressure to the specimen 2 to prevent the specimen 2 from shifting during the shearing process.

[0018] like Figure 1 As shown, a shearing method for improving shearing quality comprises the following steps: Step 1: Determine the sheet material and sheet size; determine the sheet size is 60*50*5mm, and the sheet material is Al5052 shearing example.

[0019] Step 2: Perform finite element simulation based on the material properties and size of the sheet to be sheared to determine the optimal shear blade boss size. In order to determine the optimal shear blade size, it is necessary to perform finite element simulation of the sheet shearing process through Deform. Before simulation, the stress-strain curve of the test material needs to be determined. Figure 7 This is the tensile stress-strain curve of Al5052.

[0020] Since the shearing process involves fracture, it is necessary to select a fracture criterion and calculate the damage value of the material. The criterion selected by the present invention is the Normalized c&l criterion. Different materials have different damage values, which need to be calculated according to the criterion. The formula of the Normalized c&l criterion 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 It is considered that the material has 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.

[0021] Modeling in software such as Figure 8 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 FIG9 , wherein FIG9 (a) shows the shearing effect of the shear blade of the present invention, and FIG9 (b) shows the shearing effect of the ordinary shear blade. After simulating the best result, the best shear blade size is selected, and the required optimal boss height of the 5mmAl5052 aluminum plate is 0.3mm. Step 3: Process the shear blade; process the shear blade according to the selected size.

[0022] Step 4: Carry out a shearing experiment in a shearing device; place the processed shear blade in the shearing device to shear the plate, and perform secondary shearing on the plate: the plate is sheared in the first pass; the collapse angle produced by the first shearing is reduced in the second pass, thereby achieving the purpose of improving the shearing quality. The shearing gap in the first pass is larger, and the required shearing force will be reduced. The area of ​​the second shearing pass is much smaller than that of the first pass, so the shearing force is also smaller, verifying the simulation results.

[0023] Compare the simulation and experimental results: observe whether the experimental results are consistent with the simulation results, so as to verify the role of the shear blade in the shearing process; the shearing results are shown in Figure 10, Figure 10 (a) is the shearing result of the shear blade of the present invention; Figure 10 (b) is the shearing result of the ordinary shear blade. It can be seen that the shearing quality is improved to a certain extent.

[0024] In summary, the present invention not only improves the shearing quality but also reduces the shearing force to a certain extent by performing secondary shearing on the plate during the shearing process, and improves the defects occurring during the shearing process of the medium and thick plate to a certain extent.

[0025] 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 new shear blade structure for improving shearing quality, characterized in that: It comprises a shear blade body and a boss, wherein the shear blade body is provided with a boss, and the shear blade body and the boss form a stepped structure, wherein the shear blade body is used for a first shearing pass, and the boss is used for a second shearing pass.

2. A new shear blade structure for improving shearing quality according to claim 1, characterized in that: The height direction of the boss should be perpendicular to the shearing direction.

3. A new shear blade structure for improving shearing quality according to claim 2, characterized in that: According to the material and thickness of the plate to be sheared, finite element simulation should be performed through Deform. The height of the boss can be confirmed by comparing the shear quality results under different boss heights of the finite element.

4. A new shear blade structure for improving shearing quality according to claim 3, characterized in that: The plate to be sheared is set as an elastic-plastic body in the finite element simulation, and the fracture criterion is the Normalized c&l criterion.

5. A shearing device for improving shearing quality, characterized in that: The invention comprises a supporting plate (1), a test piece (2), an upper shearing blade (3), a pressing plate (4), and a lower shearing blade (5), wherein the supporting plate (1) and the lower shearing blade (5) are located below the test piece (2), and the pressing plate (4) and the upper shearing blade (3) are located above the test piece (2).

6. A shearing device for improving shearing quality according to claim 5, characterized in that: The upper shear blade (3) is a shear blade structure as described in any one of claims 1 to 4.

7. A shearing method for improving shearing quality, characterized in that: The following steps are involved: Step 1: Determine the material and size of the sheet to be sheared; Step 2: Perform finite element simulation based on the material properties and size of the sheet to be sheared to determine the optimal shear blade boss size; Step 3: Processing the cutting edge; Step 4: Cutting is performed in a cutting device.

8. A shearing method for improving shearing quality according to claim 7, characterized in that: In step 4, the plate to be sheared is subjected to secondary shearing: the plate is sheared in the first pass; and the collapse angle produced by the first shearing is reduced in the second pass.

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