Metal plate bending device and bending method for electromagnetic shielding

Abstract

The present invention discloses a metal plate bending device for electromagnetic shielding and a bending method thereof, belonging to the field of sheet metal processing technology, comprising a base, a pressure plate and a bending plate, wherein the base has a first plane located at the top and a second plane perpendicular to the first plane, the pressure plate is used to press the fixing portion onto the first plane, the bending portion is cantilevered from the outside of the base and can be deformed by the push of the bending plate so as to fit with the second plane, a positioning angle iron is detachably provided in the base, the positioning angle iron has a first connecting surface and a second connecting surface perpendicular to each other, the first connecting surface is fixedly connected to the fixing portion, the second connecting surface is fitted with the bending portion, the positioning angle iron and the bending portion are fixedly connected by a second bolt and a second nut that cooperate with each other, an operating slot for the second bolt to pass through is provided on the base, and a notch for installing the second nut is provided on the bending plate. By providing the positioning angle iron, the rebound of the metal plate after bending is limited, the accuracy of the bending angle is ensured, and the operation is easy.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet metal processing, and in particular to a metal plate bending device for electromagnetic shielding and a bending method thereof. Background Art

[0002] An electromagnetic shielding cabinet is a device specifically designed to protect electronic equipment from electromagnetic interference. It prevents external electromagnetic waves from entering the interior of the electronic equipment and prevents electromagnetic radiation from affecting the outside world. An electromagnetic shielding cabinet is typically composed of a skeleton base and a shielding layer disposed on the surface of the skeleton base. The skeleton base is generally made of metal plates and has a hollow rectangular cabinet structure. The four side walls of the skeleton base are connected to each other in pairs, forming a shell structure with two through-holes. To facilitate the accurate installation of the upper and lower covers, the four side walls of the skeleton base must be processed to ensure that the two connected side walls are perpendicular to each other. In actual processing, in order to improve the processing efficiency of the four side walls of the skeleton base, two metal plates are usually prepared. Each metal plate is bent at a 90° angle, and then the two bent metal plates are welded together to obtain the four side walls of the skeleton base.

[0003] Because metal sheets have resilience after bending, the bending angle of the metal sheet after rebound is usually greater than 90°. Taking this factor into account, the negative angle compensation method is generally used in the actual bending process of metal sheets. That is, the bending is performed at a degree exceeding 90°. In this way, the bending angle of the metal sheet after the rebound is closer to 90°. However, even with this method, it is difficult to ensure that the metal sheet is bent at a 90° angle when bending the metal sheet using the negative angle compensation method. Subsequent trimming is required before it can be connected with other parts. The bending accuracy is difficult to guarantee and the workload is increased. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the defect in the prior art that it is difficult to ensure a 90° bending angle after the metal plate is bent, a metal plate bending device for electromagnetic shielding is provided, which has a precise bending angle and is easy to operate.

[0005] At the same time, a bending method for a metal plate for electromagnetic shielding is also provided for the bending device.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a metal plate bending device for electromagnetic shielding, used for bending a metal plate, the metal plate including a fixing part and a bending part connected to each other, including a base, a pressure plate and a bending plate, the base having a first plane located at the top and a second plane perpendicular to the first plane, the pressure plate being used to press the fixing part on the first plane, the bending part cantilevering outward from the outside of the base and being deformed under the push of the bending plate so as to fit with the second plane, a positioning angle iron is detachably provided in the base, the positioning angle iron having a first connecting surface and a second connecting surface perpendicular to each other, the first connecting surface is fixedly connected to the fixing part, the second connecting surface is fitted with the bending part, the positioning angle iron and the bending part are fixedly connected by a second bolt and a second nut that cooperate with each other, an operating groove for the second bolt to pass through is provided on the base, and a notch for installing the second nut is provided on the bending plate.

[0007] Furthermore, matching grooves are provided on both the first plane and the second plane, and the matching grooves match the positioning angle iron. The first connecting surface of the positioning angle iron is coplanar with the first plane, and the second connecting surface is coplanar with the second plane.

[0008] Furthermore, a slot is provided at the bottom of the matching groove on the first plane, and an inserting strip is protruded on the surface of the positioning angle iron opposite to the first connecting surface, and the inserting strip can be inserted into the slot in the longitudinal direction.

[0009] Furthermore, the positioning angle iron and the fixing portion are fixedly connected by a first bolt and a first nut that cooperate with each other, the tail of the first bolt passes through the positioning angle iron and the fixing portion in sequence, and the first nut is sleeved on the first bolt.

[0010] Furthermore, a first mounting hole for the first bolt to pass through is formed on the fixing portion, and a second mounting hole for the second bolt to pass through is formed on the bending portion. The first mounting hole is a round hole, and the second mounting hole is a waist-shaped hole.

[0011] Furthermore, an avoidance groove is provided at the bottom of the matching groove on the first plane, and the head of the first bolt can be accommodated in the avoidance groove. A notch is provided on the lower surface of the pressure plate corresponding to the first bolt, and the first nut on the first bolt is accommodated in the notch.

[0012] Furthermore, the base also has a transition arc surface, and the transition arc surface smoothly transitions between the first plane and the second plane.

[0013] Furthermore, the radius of the transition arc surface is R, the thickness of the metal plate is t, and R>2t.

[0014] Furthermore, the metal plate bending device for electromagnetic shielding also includes a first driving component and a second driving component, the first driving component is used to drive the pressure plate to move longitudinally to press the fixed part, the second driving component includes a slider that moves horizontally relative to the base and a driving member installed on the slider, the driving member is used to drive the bending plate to move longitudinally to push and bend the metal plate.

[0015] A method for bending a metal plate for electromagnetic shielding, applicable to any of the aforementioned metal plate bending devices for electromagnetic shielding, comprising the following steps:

[0016] S1: Fixing the first connection surface of the positioning angle iron on the fixing portion, and fitting the positioning angle iron on the base;

[0017] S2: Move the pressing plate downward to press and fix the fixing portion on the first plane;

[0018] S3: moving the bending plate downward to push the bending portion to bend and deform, so that the bending portion is in contact with the second plane and the second connecting surface;

[0019] S4: The tail of the second bolt is sequentially passed through the positioning angle iron and the bent portion via the notch of the operating slot, and then the second nut is installed on the second bolt via the notch of the bent plate;

[0020] S5: Remove the bending plate and move the pressing plate upwards, thereby removing the metal plate together with the positioning angle iron from the base.

[0021] The beneficial effect of the present invention is that: the metal plate bending device or bending method for electromagnetic shielding provided by the present invention can keep the bent metal plate fixed under the limiting effect of the positioning angle iron, so that it will not rebound, thereby ensuring that the bent metal plate is finally in a 90° bent state. In addition, after the bending plate bends the metal plate, the 90° bending state of the metal plate is maintained, and the second connecting surface of the positioning angle iron is fixedly connected to the bending part. After the connection is in place, the bending plate is withdrawn from one side of the bending part, which is convenient for fixing the positioning angle iron while also ensuring the accuracy of the bending angle of the metal plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] Figure 1 is a perspective view of a metal plate bending device for electromagnetic shielding according to the present invention;

[0024] Figure 2 yes Figure 1 An exploded view of a metal plate bending device for electromagnetic shielding is shown;

[0025] Figure 3 yes Figure 1 A front view of the metal plate bending device for electromagnetic shielding shown;

[0026] Figure 4 yes Figure 1 A right side view of the metal plate bending device for electromagnetic shielding shown;

[0027] Figure 5 yes Figure 4 A cross-sectional view of the metal plate bending device for electromagnetic shielding along AA;

[0028] Figure 6 yes Figure 1 A perspective view of a base in the metal plate bending device for electromagnetic shielding;

[0029] Figure 7 yes Figure 6 a perspective view of the base from another perspective;

[0030] Figure 8 yes Figure 2 A perspective view of a positioning angle iron in a metal plate bending device for electromagnetic shielding;

[0031] Figure 9 1. It is a schematic structural diagram of another state of the metal plate bending device for electromagnetic shielding of the present invention (the metal plate is not bent);

[0032] Figure 10 It is a flow chart of the method for bending a metal plate for electromagnetic shielding according to the present invention.

[0033] In the figure: 100, metal plate, 1100, fixing part, 1101, first mounting hole, 1200, bending part, 1201, second mounting hole, 10, base, 101, first plane, 102, second plane, 103, transition arc surface, 104, matching groove, 1041, slot, 1042, avoidance groove, 1043, operation groove, 20, pressure plate, 201, missing groove, 30, bending plate, 301, notch, 40, positioning angle iron, 401, first connecting surface, 402, second connecting surface, 403, first bolt, 404, first nut, 405, second bolt, 406, second nut, 407, circular through hole, 408, insert. DETAILED DESCRIPTION

[0034] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0035] See also Figure 1 The present invention provides a metal plate bending device for electromagnetic shielding, which is used to bend a metal plate 100. The bending device includes a base 10, a pressing plate 20 and a bending plate 30. The pressing plate 20 is located above the base 10, and the bending plate 30 is located above the base 10 and staggered with the base 10 (see Figure 1 、 Figure 10 ), the pressing plate 20 and the bending plate 30 can both move longitudinally relative to the base 10. When bending, the metal plate 100 is placed on the upper surface of the base 10, a part of the metal plate 100 is attached to the base 10 and is pressed and fixed by the pressing plate 20, and the other part of the metal plate 100 is suspended on the outside of the base 10. Then, the bending plate 30 is driven to move downward, pushing the part of the metal plate 100 suspended on the outside of the base 10, forcing the suspended part of the metal plate 100 to deform, thereby realizing the bending operation of the metal plate 100.

[0036] See also Figure 2-Figure 6 The base 10 has a block-like structure and has a first flat surface 101 at the top and a second flat surface 102 at the side. The first flat surface 101 is arranged horizontally and perpendicular to the second flat surface 102. The metal plate 100 includes a fixed portion 1100 and a bent portion 1200 connected to each other. The fixed portion 1100 is in contact with the first flat surface 101 and is pressed by the pressing plate 20. The bent portion 1200 is cantilevered from the outside of the base 10 corresponding to the second flat surface 102. The bent portion 1200 can be bent by the bending plate 30 to contact the second flat surface 102.

[0037] As a preferred embodiment, the base 10 further has a transition arc surface 103, which smoothly transitions between the first plane 101 and the second plane 102. In this way, during the bending process, the bending portion 1200 can gradually deform along the transition arc surface 103, reducing the deformation stress of the metal plate 100, reducing the risk of cracking, and improving the bending quality of the metal plate 100. It should be noted that, please refer to Figure 3 The radius R of the transition arc surface 103 , that is, the bending radius of the metal plate 100 , must be designed to be greater than twice the thickness t of the metal plate 100 , that is, R>2t, to reduce the risk of cracking of the metal plate 100 .

[0038] Furthermore, the bending plate 30 is arranged vertically, the plate surface of the bending plate 30 is parallel to the second plane 102, and the bottom of the bending plate 30 is set as an arc surface to avoid causing serious scratches on the surface of the metal plate 100 when the arc surface pushes against the metal plate 100, which helps to improve the bending quality of the metal plate 100.

[0039] See also Figure 5 、 Figure 8A positioning angle iron 40 is provided on the base 10 at the intersection of the first plane 101 and the second plane 102. The positioning angle iron 40 is detachable and located inside the base 10. The positioning angle iron 40 has a first connecting surface 401 and a second connecting surface 402 that are perpendicular to each other. The first connecting surface 401 is parallel to the first plane 101, and the second connecting surface 402 is parallel to the second plane 102. The first connecting surface 401 is used to be fixedly connected to the fixing portion 1100, and the second connecting surface 402 is used to be fixedly connected to the bending portion 1200. In this way, the bent metal plate 100 can remain fixed under the limiting effect of the positioning angle iron 40, so that it will not rebound, thereby ensuring that the bent metal plate 100 is finally in a 90° bent state. It should be noted that the arc surface structure corresponding to the transition arc surface 103 is provided between the first connecting surface 401 and the second connecting surface 402 on the positioning angle iron 40.

[0040] During specific bending, the first connecting surface 401 of the positioning angle iron 40 is first fixedly connected to the fixing part 1100, and then the metal plate 100 with the positioning angle iron 40 is placed on the base 10. After the bending plate 30 bends the metal plate 100, the 90° bending state of the metal plate 100 is maintained, and then the second connecting surface 402 of the positioning angle iron 40 is fixedly connected to the bending part 1200. After the connection is in place, the bending plate 30 is withdrawn from one side of the bending part 1200.

[0041] It should be noted that there are multiple positioning angle irons 40, and the multiple positioning angle irons 40 are sequentially spaced along the length direction of the bending line of the metal plate 100. In this way, the multiple positioning angle irons 40 can limit the rebound of the metal plate 100 from multiple locations at the bend, ensuring the bending stability of the metal plate 100.

[0042] See also Figure 2 、 Figure 5 、 Figure 6 In this embodiment, a matching groove 104 is provided on the first plane 101 and the second plane 102, and the matching groove 104 matches the positioning angle iron 40. When the positioning angle iron 40 is fitted in the matching groove 104, the first connecting surface 401 of the positioning angle iron 40 is coplanar with the first plane 101, and at the same time, the second connecting surface 402 is coplanar with the second plane 102.

[0043] As a preferred embodiment, the positioning angle iron 40 is fixedly connected to the fixing portion 1100 by a first bolt 403 and a first nut 404 that cooperate with each other, and the positioning angle iron 40 is fixedly connected to the bent portion 1200 by a second bolt 405 and a second nut 406 that cooperate with each other. Specifically, after the tail of the first bolt 403 passes through the positioning angle iron 40 and the fixing portion 1100 in sequence, the first nut 404 is fitted onto the first bolt 403 and secured by tightening the first nut 404; after the tail of the second bolt 405 passes through the positioning angle iron 40 and the bent portion 1200 in sequence, it is secured by tightening the second nut 406.

[0044] The fixing portion 1100 is provided with a first mounting hole 1101, and the bending portion 1200 is provided with a second mounting hole 1201. The first bolt 403 extends through the first mounting hole 1101, and the second bolt 405 extends through the second mounting hole 1201. In this embodiment, the first mounting hole 1101 is a circular hole, and the second mounting hole 1201 is a waist-shaped hole. The waist-shaped second mounting hole 1201 ensures that the second mounting hole 1201 on the bending portion 1200 is aligned with the second bolt 405 after bending, thereby facilitating the installation of the second bolt 405. In addition, the positioning angle iron 40 is provided with a circular through hole 407 for the first bolt 403 and the second bolt 405 to pass through. Specifically, the circular through holes 407 are respectively provided on the first connecting surface 401 and the second connecting surface 402 of the positioning angle iron 40. When the bending portion 1200 is bent into place, the circular through hole 407 on the second connecting surface 402 is aligned with the second mounting hole 1201. In order to improve the connection stability, the fixing portion 1100 is connected to the positioning angle iron 40 by two first bolts 403 , and the bending portion 1200 is connected to the positioning angle iron 40 by two second bolts 405 .

[0045] A slot 1041 is defined at the bottom of the mating groove 104 on the first plane 101. An insert 408 is protruding from the surface of the positioning angle iron 40 opposite the first connection surface 401. The insert 408 is removably inserted into the slot 1041 along the longitudinal direction. During use, when the insert 408 is inserted longitudinally into the slot 1041, the mating connection between the positioning angle iron 40 and the mating groove 104 is achieved. Because the positioning angle iron 40 can only be removed from the mating groove 104 by moving it upward longitudinally, the mating relationship between the insert 408 and the slot 1041 limits the horizontal movement of the positioning angle iron 40 relative to the base 10, ensuring the installation stability of the positioning angle iron 40 and preventing it from moving during bending operations. Furthermore, the mating relationship between the insert 408 and the slot 1041 also serves as a positioning mechanism, making it easier for the user to quickly install the positioning angle iron 40 into the mating groove 104.

[0046] The bottom of the matching groove 104 on the first plane 101 is located on one side of the slot 1041 and is provided with an escape groove 1042. The escape groove 1042 can accommodate the head of the first bolt 403 to prevent the head of the first bolt 403 from interfering with the base 10. Figure 6 、 Figure 7 An operating slot 1043 is formed at the bottom of the mating slot 104 on the second plane 102. That is, the operating slot 1043 is connected to the mating slot 104 on the second plane 102. The operating slot 1043 extends through the surface of the base 10 opposite the second plane 102, and the operating slot 1043 allows the second bolt 405 to pass through. During use, after the bending portion 1200 is bent into place under the push of the bending plate 30, the user can insert the second bolt 405 into the position of the positioning angle iron 40 through the notch of the operating slot 1043, and let the tail of the bolt pass through the positioning angle iron 40 and the bending portion 1200 in sequence.

[0047] Also, see Figure 2 、 Figure 5 A notch 301 is provided on the bending plate 30. When the bending portion 1200 is bent into place, the notch 301 is aligned with the second mounting hole 1201 on the bending portion 1200. The notch 301 allows the second bolt 405 to pass through and facilitates the user to install the second nut 406 on the second bolt 405.

[0048] A notch 201 is formed on the lower surface of the pressing plate 20 , and the notch 201 is aligned with the first nut 404 . Thus, when the pressing plate 20 presses and fixes the fixing portion 1100 on the first plane 101 , the first nut 404 is received in the notch 201 .

[0049] The metal plate bending device for electromagnetic shielding of the present invention further includes a first drive assembly and a second drive assembly. The first drive assembly is used to drive the pressure plate 20 to move longitudinally to compress or release the metal plate 100. The second drive assembly is used to drive the bending plate 30 to move. In a specific embodiment, the second drive assembly includes a slider that moves horizontally relative to the base 10 and a drive member mounted on the slider. The drive member is used to drive the bending plate 30 to move longitudinally so that the bending plate 30 pushes against the bending portion 1200 when moving downward. When the slider is moved, the drive member can be driven to move horizontally together with the bending plate 30 to move the bending plate 30 away from the metal plate 100. During use, after the bending portion 1200 is bent into position and fixedly connected to the positioning angle iron 40 by the action of the second bolt 405 and the second nut 406, the bending plate 30 is first moved horizontally away from the bending portion 1200, and then moved upward. At this time, the metal plate 100 can be lifted upward to disengage the insertion strip 408 from the slot 1041. The metal plate 100 and the positioning angle iron 40 can then be removed from the base 10. It should be noted that when the metal plate 100 is moved upward until the insertion strip 408 is just disengaged from the slot 1041, the second bolt 405 located above does not contact the upper slot wall of the operating slot 1043, thereby preventing interference from preventing the insertion strip 408 from being disengaged from the slot 1041. In one specific embodiment, the first drive assembly and the drive member are cylinders, and the slider can also be moved by cylinder drive, which is not limited here.

[0050] See also Figure 10 The present invention also provides a method for bending a metal plate for electromagnetic shielding, which is applicable to the above-mentioned metal plate bending device for electromagnetic shielding. The bending method comprises the following steps:

[0051] S1: Fix the first connection surface 401 of the positioning angle iron 40 on the fixing portion 1100, and then fit the positioning angle iron 40 on the base 10;

[0052] S2: Move the pressing plate 20 downward to press and fix the fixing portion 1100 on the first plane 101;

[0053] S3: Move the bending plate 30 downward to push the bending portion 1200 to bend and deform, so that the bending portion 1200 is in contact with the second plane 102 and the second connecting surface 402;

[0054] S4: The tail portion of the second bolt 405 is sequentially passed through the positioning angle iron 40 and the bending portion 1200 via the notch of the operating slot 1043, and then the second nut 406 is mounted on the second bolt 405 via the notch 301 of the bending plate 30;

[0055] S5: Remove the bending plate 30 and move the pressing plate 20 upward, thereby removing the metal plate 100 together with the positioning angle iron 40 from the base 10.

[0056] With the above-described preferred embodiments of the present invention as inspiration, and with reference to the above description, relevant personnel may make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A metal plate bending device for electromagnetic shielding, used for bending a metal plate, wherein the metal plate comprises a fixing portion and a bending portion connected to each other, characterized in that: The cam is configured to engage a first end of a second cam and engage a second cam of the first base, wherein the cam is configured to engage a first end of a second cam and engage a second cam of the first base.

2. The electromagnetic shielding metal plate bending device according to claim 1, wherein: Matching grooves are provided on both the first plane and the second plane. The operating groove is connected to the matching groove on the second plane. The matching groove matches the positioning angle iron. The first connecting surface of the positioning angle iron is coplanar with the first plane, and the second connecting surface is coplanar with the second plane.

3. The electromagnetic shielding metal plate bending device according to claim 2, wherein: A slot is provided at the bottom of the matching groove on the first plane, and an inserting strip is protruded from the surface of the positioning angle iron opposite to the first connecting surface, and the inserting strip can be inserted into the slot in the longitudinal direction.

4. The electromagnetic shielding metal plate bending device according to claim 3, wherein: The fixing portion is provided with a first mounting hole for the first bolt to pass through, and the bent portion is provided with a second mounting hole for the second bolt to pass through. The first mounting hole is a round hole, and the second mounting hole is a waist-shaped hole.

5. The metal plate bending device for electromagnetic shielding according to claim 2, wherein: An avoidance groove is provided at the bottom of the matching groove on the first plane, and the head of the first bolt can be accommodated in the avoidance groove. A notch is provided on the lower surface of the pressure plate corresponding to the first bolt, and the first nut on the first bolt is accommodated in the notch.

6. The electromagnetic shielding metal plate bending device according to claim 1, wherein: The base further has a transition arc surface, and the transition arc surface smoothly transitions between the first plane and the second plane.

7. The metal plate bending device for electromagnetic shielding according to claim 6, wherein: The radius of the transition arc surface is R, the thickness of the metal plate is t, and R>2t.

8. The metal plate bending device for electromagnetic shielding according to claim 1, wherein: The metal plate bending device for electromagnetic shielding also includes a first driving component and a second driving component. The first driving component is used to drive the pressure plate to move longitudinally to press the fixed part. The second driving component includes a slider that moves horizontally relative to the base and a driving member installed on the slider. The driving member is used to drive the bending plate to move longitudinally to push and bend the metal plate.

9. A method for bending a metal plate for electromagnetic shielding, applicable to the metal plate bending device for electromagnetic shielding according to any one of claims 1 to 8, characterized in that: The following steps are included: S1: Fixing the first connection surface of the positioning angle iron on the fixing portion, and fitting the positioning angle iron on the base; S2: Move the pressing plate downward to press and fix the fixing portion on the first plane; S3: moving the bending plate downward to push the bending portion to bend and deform, so that the bending portion is in contact with the second plane and the second connecting surface; S4: The tail of the second bolt is sequentially passed through the positioning angle iron and the bent portion via the notch of the operating slot, and then the second nut is installed on the second bolt via the notch of the bent plate; S5: Remove the bending plate and move the pressing plate upwards, thereby removing the metal plate together with the positioning angle iron from the base.

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