A kind of layer tear plate blanking die, layer tear gasket and its blanking processing method

Abstract

The present application relates to layer tear part manufacturing technology field, disclose a kind of layer tear plate blanking die, layer tear gasket and its blanking processing method.Layer tear plate blanking die is used for the layer tear plate of thickness t, the layer tear plate blanking die includes the male die and female die that can be realized concave-convex cooperation along preset direction, the blade edge of the female die is provided with bevel, the included angle between the bevel and the preset direction is α, 15 ° ≤ α ≤ 40 °, the depth of the bevel along the preset direction is h, 0.1t ≤ h ≤ 0.35t.Layer tear gasket blanking processing method includes using the layer tear plate blanking die, to form the layer tear gasket of specific shape.The layer tear plate blanking die and the blanking processing method of layer tear gasket of the present application process the layer tear gasket, and fracture zone will not appear tear zone and delamination, and edge quality is good.

Description

Technical Field

[0001] This invention relates to the field of blanking manufacturing technology for layered tear parts, and in particular to a blanking die for layered tear sheet metal, a blanking processing method for layered tear gaskets, and layered tear gaskets. Background Technology

[0002] Peelable gaskets, also known as removable sheets, are typically made of multiple layers of thin sheets bonded together and machined into specific shapes through milling or punching. During use, one or more layers can be peeled off the surface of the gasket to adjust the gap thickness according to the actual assembly requirements. This flexibility makes them widely used in the aircraft manufacturing industry.

[0003] The raw materials for plywood can be such as Figure 1 The structure shown is made of multiple layers of thin sheets bonded together, or it can be as follows: Figure 2 The structure shown is composed of a single substrate and multiple layers of thin plates bonded together. For example... Figure 3 As shown, when using a conventional press and conventional blanking dies to blank sheet metal, the metal in the shear zone of the sheet metal is subjected to tensile stress, such as... Figure 4 As shown, delamination occurs during the punching process of laminated sheets made by bonding a substrate and multiple layers of thin plates. Tearing bands (not shown) appear at the fracture zone of the laminated gaskets cut from these laminated sheets, affecting the edge quality of the gaskets. This means that current conventional presses and punching dies cannot completely prevent tearing bands / delamination. In existing technology, the only effective way to avoid delamination / tear bands in the shearing zone is by using precision punching equipment (a three-action precision punching press with a V-ring die structure). However, using precision punching equipment is costly and unsuitable for manufacturing discrete parts like gaskets in the aircraft manufacturing industry.

[0004] Therefore, there is an urgent need for a die for cutting sheet metal, a blanking method for sheet metal, and sheet metal blanking to solve the above-mentioned technical problems. Summary of the Invention

[0005] The first objective of this invention is to provide a sheet metal punching die that can avoid the problem of tearing or delamination in the blanking fracture area, and ensure that the blanking fracture area achieves a fully glossy effect.

[0006] The second objective of this invention is to provide a blanking process for a layer-tear gasket. By using the aforementioned layer-tear sheet blanking die, tearing bands and delamination can be avoided in the fracture area of ​​the layer-tear gasket during the blanking process, resulting in good edge quality of the layer-tear gasket.

[0007] The third objective of this invention is to provide a layer-tear gasket, which is manufactured by blanking using the above-mentioned blanking process for layer-tear gaskets, and the fracture area will not have tear bands or delamination, and the edge quality is good.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] A die for cutting sheet metal of thickness t is provided. The die includes a punch and a die that can achieve a convex-concave fit along a preset direction. The cutting edge of the die is provided with a beveled surface. The angle between the beveled surface and the preset direction is α, where 15°≤α≤40°. The depth of the beveled surface along the preset direction is h, where 0.1t≤h≤0.35t.

[0010] As an optional solution, the single-sided gap between the die and the punch is b, where b ≤ 0.1 mm.

[0011] As an optional solution, the sheet metal blanking die also includes a pressure spring, which is disposed on the side of the punch and used to press the sheet metal against the punch. The pressure spring can exert a pressure force on the sheet metal during the blanking process.

[0012] As an alternative, the sheet metal punching die includes a plurality of pressure springs, which are evenly distributed along the circumference of the punch.

[0013] As an optional solution, the sheet metal blanking die also includes a counter-pressure spring, which is disposed in the inner cavity of the die and can support the blanking material generated during the cutting process. The counter-pressure spring can provide a counter-pressure force on the blanking material during the blanking process.

[0014] As an optional solution, the cutting edge of the punch is provided with a fillet, the radius of which is not greater than 0.1mm.

[0015] A blanking process for a layer-tearable gasket involves using the aforementioned layer-tearable sheet blanking die to blank the layer-tearable sheet, wherein the shape of the cutting edge of the punch and the shape of the cutting edge of the die are both matched with the shape of the layer-tearable gasket.

[0016] As an alternative, the sheet material is made of multiple layers of thin sheets bonded together; or

[0017] The raw material of the peelable sheet is made of a substrate and multiple thin sheets bonded together.

[0018] As an alternative, the sheet and / or the substrate are made of aluminum alloy.

[0019] A type of tear-off gasket, manufactured using the aforementioned tear-off sheet punching die.

[0020] The beneficial effects of this invention are:

[0021] The sheet metal blanking die of the present invention, by setting a beveled surface at the cutting edge of the die and ensuring that the angle between the beveled surface and the preset direction is between 15° and 40°, and the depth of the beveled surface along the preset direction is between 0.1t and 0.35t, can control the stress state of the shearing zone during blanking using a conventional press, and ensure that the stress state of the fracture zone changes from tensile stress to compressive stress, thereby avoiding the problem of tearing or delamination in the fracture zone, ensuring that the fracture zone achieves a near-full gloss effect, and with low overall cost, is suitable for blanking processing of scattered parts such as sheet metal gaskets in the aerospace manufacturing industry.

[0022] The layer-tear gasket processing method of the present invention, by using the above-mentioned layer-tear sheet punching die, can avoid tearing bands and delamination in the fracture area of ​​the layer-tear gasket during the punching process, and the edge quality of the layer-tear gasket is good.

[0023] The tear-resistant gasket of the present invention, by adopting the above-mentioned punching process for tear-resistant gaskets, will not have tear bands or delamination in the fracture area, and has good edge quality. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of a type of tear-away sheet material provided by existing technology;

[0025] Figure 2 This is a cross-sectional schematic diagram of another type of peelable sheet material provided by existing technology;

[0026] Figure 3 This is a schematic diagram of the cross-section of the sheet metal before the cutting layer is torn off, provided by the existing technology of the punching die;

[0027] Figure 4 This is a schematic diagram of the cross-section of the sheet metal after the cutting layer is torn off using a punching die provided by existing technology;

[0028] Figure 5 This is a cross-sectional schematic diagram of the sheet metal cutting die provided in a specific embodiment of the present invention before cutting the sheet metal.

[0029] Figure 6 This is a schematic diagram of the cross-section of the sheet metal after being cut by the sheet metal punching die according to a specific embodiment of the present invention;

[0030] Figure 7 yes Figure 6 Enlarged view of point A in the image.

[0031] In the picture:

[0032] 100-Layer peelable sheet; 101-Thin sheet; 102-Substrate; 200-Layer peelable gasket;

[0033] 1-Punch; 11-Rounded corner; 2-Die; 21-Beveled surface; 22-Inner cavity; 3-Pressure spring; 4-Reverse spring. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention and not the entire structure.

[0035] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0038] This embodiment provides a die for blanking sheet metal and a method for blanking sheet metal. Specifically, the blanking method for sheet metal is achieved using the die for blanking sheet metal 100 to form sheet metal 200. Optionally, as... Figure 1 As shown, the sheet material 100 can be made of raw materials bonded together from multiple layers of thin sheets 101, such as... Figure 2As shown, the sheet material 100 can also be a raw material formed by bonding a substrate 102 and multiple thin sheets 101. The difference between the substrate 102 and the thin sheets 101 is that the thickness of the substrate 102 is greater than the thickness of the thin sheets 101. Furthermore, the sheet material 100 is made of aluminum alloy, and the sheet gasket 200 formed by its stamping can be used in the field of aircraft manufacturing.

[0039] For a laminated sheet 100 made of multiple thin sheets 101 bonded together, when punched using a conventional press and die, a tear band will form in the fracture zone of the blank (i.e., the laminated sheet 200). For a laminated sheet 100 made of a substrate 102 and multiple thin sheets 101 bonded together, when punched using a conventional press and die, delamination will occur in the fracture zone of the blank (i.e., the laminated sheet 200), affecting the normal use of the laminated sheet 200.

[0040] This embodiment provides a die for punching sheet metal, which can solve the problem of delamination and tearing bands appearing in the fracture area of ​​the sheet metal 200. This embodiment is illustrated using a sheet metal 100 formed by bonding a single substrate 102 and multiple thin sheets 101 as an example.

[0041] like Figures 5-7 As shown in the figure, the X direction represents the preset direction. The thickness of the sheet metal 100 is t. The sheet metal punching die includes a punch 1 and a die 2. The die 2 has an inner cavity 22. The punch 1 can move towards the die 2 along the preset direction and be accommodated in the inner cavity 22 of the die 2 to achieve the punch-die fit between the punch 1 and the die 2. The edge of the inner cavity 22 of the die 2 near the punch 1 is the cutting edge of the die 2. The cutting edge of the die 2 has a beveled surface 21. The angle between the beveled surface 21 and the preset direction is α (α is the die entry angle), and 15°≤α≤40°. The depth of the beveled surface 21 along the preset direction is h, and 0.1t≤h≤0.35t.

[0042] The sheet metal blanking die of this embodiment, by setting a beveled surface 21 at the cutting edge of the die 2, and ensuring that the angle between the beveled surface 21 and the preset direction is between 15° and 40°, and the depth of the beveled surface 21 along the preset direction is between 0.1t and 0.35t, can control the stress state of the blanking fracture area during the blanking process using a conventional press, and ensure that the stress state of the blanking fracture area changes from tensile stress to compressive stress, thereby avoiding the problem of tearing bands or delamination in the blanking fracture area, ensuring a fully bright effect in the blanking fracture area, and having low overall cost, is suitable for processing scattered parts such as sheet metal gaskets 200. The sheet metal gasket processing method of this embodiment, by using the above-mentioned sheet metal blanking die, can avoid the occurrence of tearing bands and delamination in the fracture area of ​​the sheet metal gasket 200 during the blanking process, and the edge quality of the sheet metal gasket 200 is good.

[0043] Preferably, the shape of the cutting edge of the punch 1 and the shape of the cutting edge of the die 2 are matched with the shape of the tear-off pad 200.

[0044] Preferably, such as Figure 7 As shown, the single-sided gap between the die 2 and the punch 1 is b, where b ≤ 0.1 mm. By limiting the single-sided gap between the die 2 and the punch 1 to the above-mentioned small range, the forming accuracy can be improved, and it can further prevent the shear zone of the delaminated gasket 200 from being subjected to tensile stress, thereby preventing the occurrence of tear bands and delamination problems.

[0045] Preferably, such as Figure 7 As shown, a fillet 11 is provided at the cutting edge of the punch 1, and the radius of the fillet 11 is not greater than 0.1mm. Optionally, the radius of the fillet 11 can be 0.07mm, 0.05mm, etc., and the specific value is not limited here.

[0046] In this embodiment, the sheet metal blanking die has an angle (entry angle) α = 30° between the beveled surface 21 and the preset direction, a depth h = 0.25t along the preset direction, and a single-sided gap b = 0.07mm between the die 2 and the punch 1. Through simulation and actual experiments, it is verified that the edge fracture of the sheet metal blanking die 200 produced by this die is free of delamination and tearing bands, achieving a fully glossy finish.

[0047] Preferably, such as Figure 6 As shown, the sheet metal blanking die also includes a pressure spring 3, which is disposed on the side of the punch 1 and used to press the edge of the sheet metal 100 against the punch 1. By setting the pressure spring 3, the pressure force on the sheet metal 100 during the blanking process can be increased, thereby further reducing the possibility of tensile stress and ensuring a bright surface in the fracture area of ​​the sheet metal 200. Preferably, in this embodiment, the sheet metal blanking die includes multiple pressure springs 3, which are evenly distributed along the circumference of the punch 1, thereby ensuring more uniform pressure on the sheet metal 100.

[0048] Preferably, such as Figure 6 As shown, the sheet metal blanking die also includes a counter-lift spring 4. The counter-lift spring 4 is disposed in the inner cavity 22 of the die cavity 2 and can provide a counter-lifting force for the shearing zone of the blanking material (i.e., the sheet metal 200), further reducing the risk of tensile stress in the fracture area. By setting the counter-lift spring 4, it is easier to demold the sheet metal 200 from the die cavity 2, improving the efficiency of the blanking process. Optionally, the sheet metal blanking die includes multiple counter-lift springs 4, which are evenly arranged in the inner cavity 22 of the die cavity 2. The specific number of counter-lift springs 4 is not limited here and can be selected according to actual needs.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, based on the concept of the present invention, there will be changes in specific implementation methods and application scope. The content of this specification should not be construed as a limitation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A die for cutting sheet metal, used for cutting sheet metal of thickness t, characterized in that, The sheet metal punching die includes a punch (1) and a die (2) that can achieve a convex-concave fit along a preset direction. The die (2) has a beveled surface (21) at its cutting edge. The angle between the beveled surface (21) and the preset direction is α, 15°≤α≤40°. The depth of the beveled surface (21) along the preset direction is h, 0.1t≤h≤0.35t. The sheet metal punching die also includes a pressure spring (3), which is disposed on the side of the punch (1) and is used to press the sheet metal onto the punch (1). The pressure spring (3) can exert a pressure force on the sheet metal during the punching process. The sheet metal punching die also includes a counter-top spring (4), which is disposed in the inner cavity (22) of the die (2) and can support the blanking material generated during the cutting process. The counter-top spring (4) can provide a counter-top force to the blanking material during the punching process. The cutting edge of the punch (1) is provided with a fillet (11), and the radius of the fillet (11) is not greater than 0.1mm.

2. The sheet metal punching die as described in claim 1, characterized in that, The single-sided gap between the concave die (2) and the convex die (1) is b, where b ≤ 0.1 mm.

3. The sheet metal punching die as described in claim 1, characterized in that, The sheet metal punching die includes a plurality of pressure springs (3), which are evenly distributed along the circumference of the punch (1).

4. A method for blanking a layered gasket, characterized in that, The layer-tear sheet is punched using the die for punching the layer-tear sheet according to any one of claims 1-3, wherein the shape of the cutting edge of the punch (1) and the shape of the cutting edge of the die (2) are both matched with the shape of the layer-tear sheet.

5. The blanking process method for the layer-tearable gasket as described in claim 4, characterized in that, The peelable sheet is made of multiple layers of thin sheets (101) bonded together; or The peelable sheet is made by bonding a substrate (102) and multiple thin sheets (101).

6. The blanking process for the layer-tearable gasket as described in claim 5, characterized in that, The thin plate (101) and / or the substrate (102) are made of aluminum alloy.

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