Precise bending die for metal machining

Abstract

The invention relates to the field of metal processing protection, in particular to a precise bending die for metal processing, which comprises a supporting assembly. The supporting assembly can meet the stretching requirement of the bending film, and when the movable mold gets close to the fixed mold, the supporting assembly gradually loosens the bending film so that the bending film can be completely attached to the bending contour of the fixed mold. And when the movable mold is far away from the fixed mold, the supporting assembly can tension the bending film again. The supporting assembly provides continuous and stable tension for the bending film, wrinkles are avoided, indentations and scratches cannot appear on the surface of the plate due to the wrinkles, and the surface quality of the plate is remarkably improved. And meanwhile, abnormal contact gaps and stress distribution caused by wrinkles of the bending film are eliminated, so that the plate can be subjected to plastic deformation according to the bending contour in the bending process, and the surface of the plate is uniformly and effectively protected.

Description

Technical Field

[0001] This invention relates to the field of metal processing protection, and in particular to a precision bending die for metal processing. Background Technology

[0002] Bending film is a protective material used during the bending process of metal sheets. It prevents scratches and indentations, and avoids coating wear and surface contamination. Before use, clean the sheet metal, moving mold, and fixed mold. Cut the bending film to the appropriate size and place it flat or attach it to the corresponding position on the fixed mold. Then, drive the moving mold to process the sheet metal. After completion, remove the bending film; intact bending film can be reused.

[0003] However, in existing technologies, the bending film experiences uneven stress and varying degrees of tensile deformation during bending. Especially in stress-concentrated areas such as bend corners, the bending film can wrinkle due to excessive stretching or localized stacking. Under bending pressure, these wrinkles directly cause indentations and scratches on the board surface, damaging its appearance and protective performance. Furthermore, wrinkles can lead to abnormal contact gaps and stress distribution, interfering with the board's plastic deformation trajectory and affecting the dimensional accuracy after bending, resulting in problems such as out-of-tolerance product defects and reduced assembly compatibility. Summary of the Invention

[0004] Therefore, it is necessary to provide a precision bending die for metal processing to address the problem that wrinkles easily form in the bending die during the bending process of sheet metal in current precision bending dies for metal processing.

[0005] The above objectives are achieved through the following technical solutions: A precision bending die for metal processing, comprising: A fixed mold is provided with a bending part, which is used to provide a bending profile for the sheet metal. A bending film can be placed on the surface of the bending part to prevent the sheet metal from directly contacting the surface of the bending part. A movable mold, which can move closer to or further away from the fixed mold, and when the movable mold moves closer to the fixed mold, the movable mold and the fixed mold can bend the sheet metal; A support assembly is provided that can gradually relax the bending film as the moving mold moves toward the fixed mold, so that the bending film conforms to the bending profile, and the support assembly can also re-tension the bending film as the moving mold moves away from the fixed mold.

[0006] Furthermore, the support assembly includes a first take-up roller and a second take-up roller, which are rotatably connected to both ends of the fixed mold, and the two ends of the bending film are respectively wound around the first take-up roller and the second take-up roller.

[0007] The first take-up roller is provided with a first elastic element, and the second take-up roller is provided with a second elastic element. The first elastic element and the second elastic element always cause the first take-up roller and the second take-up roller to rotate in a direction away from the axis of the fixed mold, so that the bending film gradually relaxes when the moving mold approaches the fixed mold, and is tightened again when the moving mold moves away from the fixed mold.

[0008] Furthermore, it also includes a movable component, which is used to replace the bending film on the fixed mold after a sheet material has been bent.

[0009] Furthermore, the moving component includes a unidirectional structure that restricts the bending film to move only toward the first take-up roller or the second take-up roller.

[0010] Furthermore, the unidirectional structure is configured in two sets. One set of the unidirectional structure is used to restrict the bending film to move only towards the second take-up roller, and the other set of the unidirectional structure is used to restrict the bending film to move only towards the first take-up roller. The moving component also includes two sets of control structures, which are used to switch the action state of the two sets of unidirectional structures on the bending film respectively.

[0011] Furthermore, each set of the unidirectional structures includes a unidirectional gear, a locking rod, and a third elastic element. The unidirectional gear is coaxially fixedly connected to one end of the first winding roller or the second winding roller. The locking rod is slidably connected to the fixed mold, and one end of the locking rod is engaged with the unidirectional gear so that the unidirectional gear rotates in a single direction around its own axis. The elastic force of the third elastic element always causes the locking rod to engage with the unidirectional gear.

[0012] Furthermore, each set of control structures includes a locking pin and a fourth elastic element. The end of the locking rod away from the one-way gear is provided with a through hole, and the locking pin coaxially passes through the through hole. The fixed mold is provided with a stop groove. When the axis of the stop groove and the axis of the locking pin are collinear, one end of the locking pin can be embedded in the stop groove. The fourth elastic element is located between the locking pin and the locking rod. When the axis of the stop groove and the axis of the locking pin are collinear, the elastic force of the fourth elastic element always causes the locking pin to be embedded in the stop groove.

[0013] Furthermore, it also includes an adjustment component, which is used to adjust the movement displacement of the bending film on the first take-up roller and the second take-up roller after a sheet material has been bent.

[0014] Furthermore, the adjusting assembly includes a fixed block and a supporting elastic element. The first winding roller and the second winding roller are rotatably connected to both ends of the fixed block, respectively. The fixed block is disposed outside the fixed mold, and the fixed mold can slide within the fixed block so that the first winding roller and the second winding roller are relative to the fixed mold. The elastic force of the supporting elastic element always keeps the fixed mold in its initial position within the fixed block.

[0015] Furthermore, the adjustment component also includes a movable block, which is slidably connected to the fixed block and slides in a direction perpendicular to the sliding direction of the fixed mold. The movable block can abut against the fixed mold via an inclined surface, and slides on the fixed block to adjust the displacement of the fixed mold sliding on the fixed block.

[0016] The beneficial effects of this invention are: This invention provides a precision bending die for metal processing, comprising a support assembly. During sheet metal bending, the support assembly adapts to the stretching requirements of the bending film. As the moving die approaches the fixed die, the support assembly gradually relaxes the bending film to ensure it fully conforms to the bending contour of the fixed die. As the moving die moves away from the fixed die, the support assembly re-tensions the bending film. The support assembly provides continuous and stable tension to the bending film, preventing indentations and scratches on the sheet metal surface caused by wrinkles, significantly improving the surface quality of the sheet metal. Simultaneously, because the bending film is wrinkle-free, it eliminates the contact gap between the bending film and the sheet metal caused by wrinkles, as well as the abnormal local stress distribution caused by wrinkles, allowing the sheet metal to be shaped and deformed strictly according to the bending contour during bending. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a precision bending die for metal processing provided in an embodiment of the present invention; Figure 2 for Figure 1 A front view of the structure shown; Figure 3 for Figure 1 The structure shown is a front view of the sheet metal when it is bent. Figure 4 for Figure 1 Side view of the structure shown; Figure 5 for Figure 4 A cross-sectional view along the AA direction; Figure 6 for Figure 4 Cross-sectional view along the BB direction; Figure 7 for Figure 4 A magnified view of a section at point C; Figure 8 for Figure 6 A magnified view of a section at point D.

[0018] in: 110. Base; 120. Fixing mold; 130. Bending film; 210. First take-up roll; 220. Second take-up roll; 310. One-way gear; 320. Locking rod; 321. Mounting plate; 330. Third spring; 340. Locking pin; 350. Fourth spring; 360. Stop groove; 410. Fixed block; 420. Support spring; 430. Moving block; 440. Drive rod; 510. Sheet metal. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] The following reference Figures 1 to 8 This invention describes a precision bending die for metal processing provided by an embodiment of the present invention.

[0023] The present invention provides a precision bending die for metal processing, comprising a base 110, a fixed die 120, a movable die (not shown in the figure), a bending film 130, and a support assembly.

[0024] The base 110 is placed on a fixed support surface and has stable support capabilities, providing a solid mounting base for other components.

[0025] The fixed mold 120 is detachably mounted on the base 110. The fixed mold 120 is provided with a bending part, which is used to provide a bending profile for the sheet material, so that the sheet material 510 can deform according to the bending profile during the bending process.

[0026] The movable mold is a forming structure adapted to the fixed mold 120. The area between the movable mold and the fixed mold 120 is used to place the sheet material 510 to be bent. The movable mold can move closer to or away from the fixed mold 120. When the movable mold is close to the fixed mold 120, the movable mold and the fixed mold can bend the sheet material 510.

[0027] The bending film 130 is a flexible and wear-resistant film that is placed on the surface of the bending part of the fixed mold 120 and covers the plate to be processed 510 and the fixed mold 120 to prevent the plate 510 from directly contacting the bending part of the fixed mold 120 and causing indentations or scratches.

[0028] The support assembly includes a first take-up roller 210 and a second take-up roller 220. Both the first take-up roller 210 and the second take-up roller 220 are cylindrical roller structures. The first take-up roller 210 and the second take-up roller 220 are rotatably connected to both ends of the fixed mold 120, and can rotate freely around their own axes. The two ends of the bending film 130 are respectively wound around the first take-up roller 210 and the second take-up roller 220. The first take-up roller 210 is provided with a first elastic element, which is a first torsion spring. The direction of the elastic force of the first torsion spring always causes the first take-up roller 210 to rotate in a direction away from the axis of the fixed mold 120. The second take-up roller 220 is provided with a second elastic element, which is a second torsion spring. The direction of the elastic force of the second torsion spring always causes the second take-up roller 220 to rotate in a direction away from the axis of the fixed mold 120.

[0029] In the initial state, under the action of the first torsion spring and the second torsion spring, the first take-up roller 210 and the second take-up roller 220 always tend to rotate in a direction away from the axis of the fixed mold 120, so that the first take-up roller 210 and the second take-up roller 220 generate a continuous tension on both ends of the bending film 130, thereby tensioning the bending film 130.

[0030] During use, the sheet material 510 to be bent is first placed in the area between the fixed mold 120 and the moving mold. At this time, the bending film 130 covers the area between the sheet material 510 and the fixed mold 120. Subsequently, the moving mold approaches the fixed mold 120 along a preset trajectory, applying uniform and constant pressure to the sheet material 510. Under the combined action of the fixed mold 120 and the moving mold, the sheet material 510 begins to bend and deform. During the bending process of the moving mold, as the sheet material 510 bends and deforms, the bending film 130 stretches along with the deformation of the sheet material 510. At this time, the first take-up roller 210 overcomes the elastic force of the first torsion spring and rotates towards the axis of the fixed mold 120, and the second take-up roller 220 overcomes the elastic force of the second torsion spring and rotates towards the axis of the fixed mold 120. The first take-up roller 210 and the second take-up roller 220 release the length of the bending film 130 adapted to the stretching requirements through rotation, ensuring that the bending film 130 can completely conform to the bending contour. Since the first torsion spring always maintains a spring force on the first take-up roller 210 and the second torsion spring always maintains a spring force on the second take-up roller 220, these spring forces will continue to act on the bending film 130, so that the bending film 130 is wrinkle-free.

[0031] After the bending process of the sheet 510 is completed, the moving mold moves away from the fixed mold 120 along the preset trajectory. At this time, the first torsion spring can drive the first take-up roller 210 to rotate in a direction away from the axis of the fixed mold 120, and the second torsion spring can drive the second take-up roller 220 to rotate in a direction away from the axis of the fixed mold 120, thereby completely retracting the bending film 130 released during the bending process and re-tensioning the bending film 130, thus completing a complete bending operation of the sheet 510.

[0032] Therefore, by using the first take-up roller 210 and the second take-up roller 220 to tension the bending film 130 after bending the sheet 510, wrinkles in the bending film 130 are effectively avoided. This ensures that the surface of the sheet 510 after bending will not have indentations or scratches caused by wrinkles in the bending film 130, and the surface quality is significantly improved. At the same time, the dimensional accuracy of the sheet 510 after bending is also effectively guaranteed, and the tolerance can be controlled within the design requirements, resulting in good assembly compatibility.

[0033] In one embodiment, after repeated use, the bending film 130 is prone to the adhesion of impurities and may be partially damaged. If not dealt with in time, the impurities will cause indentations on the surface of the board 510 during subsequent bending processes, and the damaged parts will not be able to effectively protect the board 510, resulting in scratches on the surface of the board 510.

[0034] Based on this, the precision bending die for metal processing provided in this embodiment of the invention also includes a moving component. The moving component is used to drive the bending film 130 on the fixed die 120 to move after a plate 510 is bent, so as to realize the replacement of the bending film 130 on the fixed die 120.

[0035] The moving component includes a unidirectional structure that restricts the bending film 130 to move only toward the second take-up roller 220. That is, the second take-up roller 220 can perform both take-up and release actions, while the first take-up roller 210 can only perform release actions.

[0036] The one-way structure includes a one-way gear 310, a locking rod 320, a mounting plate 321, and a third elastic element.

[0037] The one-way gear 310 is a gear structure with a one-way tooth profile, coaxially fixedly connected to one end of the first take-up roller 210. The mounting plate 321 is an L-shaped plate formed by two mutually perpendicular vertical plates fixedly connected, one end of which is fixedly connected to the fixed mold 120. The locking rod 320 is a rod structure, slidably connected to the other end of the mounting plate 321, and the sliding direction of the locking rod 320 is perpendicular to the axis of the one-way gear 310. One end of the locking rod 320 is machined with a snap-fit ​​part that matches the tooth profile of the one-way gear 310. The snap-fit ​​part and the tooth groove of the one-way gear 310 form a snap-fit ​​engagement, restricting the one-way gear 310 to rotate only in one direction around its own axis. When the one-way gear 310 attempts to rotate in the opposite direction, the snap-fit ​​part of the locking rod 320 will engage with the tooth groove and prevent it from rotating. The third elastic element is a third spring 330. One end of the third spring 330 is fixedly connected to the mounting plate 321, and the other end is fixedly connected to the locking rod 320. When the bending film 130 needs to move towards the second take-up roller 220, the elastic force of the third spring 330 drives the locking rod 320 to slide towards the one-way gear 310 at the end of the first take-up roller 210. The locking part of the locking rod 320 engages with the one-way gear 310 at the end of the first take-up roller 210, restricting the first take-up roller 210 to rotate only in the direction of releasing the bending film 130.

[0038] When the sheet 510 is bent, the first take-up roller 210 and the second take-up roller 220 release the bending film 130 to the required length to meet the stretching requirements, ensuring that the bending film 130 completely conforms to the bending contour. After the bending process of the sheet 510 is completed, the moving mold moves away from the fixed mold 120 along a preset trajectory. At this time, since the first take-up roller 210 can only release the bending film 130 in one direction, the second take-up roller 220, under the action of the second torsion spring, completely retracts the bending film 130 released during the bending process, realizing the movement of the bending film 130 towards the second take-up roller 220. Thus, after each bending of the sheet 510, the bending film 130 completes a certain distance of directional movement.

[0039] Therefore, the unidirectional structure allows the bending film 130 to move stably only in a preset direction. The bending process of the sheet 510 synchronously drives the bending film 130, effectively removing impurities from its surface. Damaged areas can be observed and addressed promptly, completely preventing indentations and scratches on the sheet 510 surface caused by impurities and damage. Furthermore, surface renewal of the bending film 130 can be completed without manual intervention, significantly improving production efficiency and ensuring the continuity of the processing.

[0040] Understandably, the unidirectional structure can also be used to restrict the bending film 130 to move only in the direction of the first take-up roller 210, that is, the first take-up roller 210 can perform the take-up and take-down actions, while the second take-up roller 220 can only perform the take-down action.

[0041] Specifically, the one-way gear 310 is coaxially fixed to one end of the second take-up roller 220. When the bending film 130 needs to move towards the first take-up roller 210, the elastic force of the third spring 330 drives the locking rod 320 to slide towards the one-way gear 310 at the end of the second take-up roller 220. The locking part of the locking rod 320 engages with the one-way gear 310 at the end of the second take-up roller 220, restricting the second take-up roller 220 to rotate only in the direction of releasing the bending film 130. After the bending process of the sheet 510 is completed, since the second take-up roller 220 can only release the bending film 130 in one direction, the first take-up roller 210, under the action of the first torsion spring, completely retracts the bending film 130 released during the bending process, realizing the movement of the bending film 130 towards the first take-up roller 210.

[0042] Furthermore, the moving component also includes a control structure. Two sets of unidirectional structures are configured. One set restricts the bending film 130 to move only towards the second take-up roller 220, meaning the second take-up roller 220 can perform both winding and unwinding actions, while the first take-up roller 210 can only unwind. The other set of unidirectional structures restricts the bending film 130 to move only towards the first take-up roller 210, meaning the first take-up roller 210 can perform both winding and unwinding actions, while the second take-up roller 220 can only unwind. Two sets of control structures are also configured. Each control structure switches the state of the unidirectional structure's effect on the bending film 130. By switching the state, the bending film 130 can move both towards the first take-up roller 210 and towards the second take-up roller 220, thus enabling bidirectional use of the bending film 130 and improving its utilization rate.

[0043] The control structure includes a locking pin 340, a stop groove 360, and a fourth elastic element. The locking rod 320 has a through hole at its end away from the one-way gear 310, the axis of which is perpendicular to the sliding direction of the locking rod 320. The locking pin 340 is a cylindrical rod structure with a diameter equal to the diameter of the through hole, allowing it to pass coaxially through the through hole and slide freely within it. The stop groove 360 ​​is a recessed structure formed on the surface of the fixed mold 120, its shape adapted to the end shape of the locking pin 340. When the axes of the stop groove 360 ​​and the locking pin 340 are collinear, one end of the locking pin 340 can be fully embedded in the stop groove 360, forming a stable locking fit. The fourth elastic element is the fourth spring 350. The fourth spring 350 is sleeved on the outside of the locking pin 340 and located between the locking pin 340 and the locking rod 320. The elastic force of the fourth spring 350 always acts along the axis of the locking pin 340 towards the stop groove 360. When the axis of the stop groove 360 ​​and the locking pin 340 are collinear, the fourth spring 350 always drives one end of the locking pin 340 to be embedded in the stop groove 360, so that the locking rod 320 is stably kept away from the one-way gear 310.

[0044] During use, when the bending film 130 needs to move toward the second take-up roller 220, a set of control structures maintains the unidirectional structure of the corresponding first take-up roller 210, restricting the first take-up roller 210. That is, the locking pin 340 on the side of the first take-up roller 210 is pulled away from the stop groove 360, the fourth spring 350 is compressed, and the locking pin 340 is disengaged from the stop groove 360. At this time, the elastic force of the third spring 330 drives the locking rod 320 to slide toward the unidirectional gear 310 at the end of the first take-up roller 210. The locking part of the locking rod 320 engages with the unidirectional gear 310 at the end of the first take-up roller 210, restricting the first take-up roller 210 to rotate only in the direction of releasing the bending film 130. Simultaneously, another set of control structures releases the restriction of the second take-up roller 220 on the second take-up roller 220 by the unidirectional structure, i.e., pulling the locking rod 320 away from the unidirectional gear 310, compressing the third spring 330, and separating the locking part of the locking rod 320 from the unidirectional gear 310 at the end of the second take-up roller 220, allowing the second take-up roller 220 to rotate freely. As the locking rod 320 continues to move, when the axes of the stop groove 360 ​​and the locking pin 340 are collinear, the elastic force of the fourth spring 350 drives the locking pin 340 to slide towards the stop groove 360, maintaining the locking pin 340 on the second take-up roller 220 side embedded in the stop groove 360. At this time, the second take-up roller 220 can perform both take-up and release actions, while the first take-up roller 210 can only perform a release action.

[0045] Similarly, when the bending film 130 needs to move toward the first take-up roller 210, a set of control structures maintains the unidirectional structure of the corresponding second take-up roller 220 from restricting the second take-up roller 220, and another set of control structures releases the unidirectional structure of the corresponding first take-up roller 210 from restricting the first take-up roller 210.

[0046] Therefore, by using two sets of control structures to switch between the states of the two unidirectional structures, the bending membrane 130 can move in both directions, enabling multiple full utilization of the bending membrane 130, reducing material costs, and improving the utilization rate of the bending membrane 130.

[0047] In one embodiment, when the sheet metal 510 contains excessive impurities, the fixed displacement is insufficient to completely remove the impurities. Therefore, this embodiment of the invention provides a precision bending die for metal processing that further includes an adjustment component. This adjustment component is used to adjust the movement displacement of the bending die 130 on the first take-up roller 210 and the second take-up roller 220 after the sheet metal 510 has been bent. Specifically, the adjustment assembly includes a fixed block 410, a support elastic element, a movable block 430, and a drive rod 440.

[0048] The fixing block 410 is fixedly connected to the base 110. The fixing block 410 is located outside the fixing mold 120, and the fixing mold 120 can slide freely within the fixing block 410 along its own axis. The first take-up roller 210 and the second take-up roller 220 are no longer directly rotatably connected to the fixing mold 120, but are rotatably connected to both ends of the fixing block 410 respectively. The supporting elastic element is a supporting spring 420. One end of the supporting spring 420 is fixedly connected to the fixing block 410, and the other end is fixedly connected to one end of the fixing mold 120. The elastic force of the supporting spring 420 always drives the fixing mold 120 to move towards the initial position, which is the reference position when the fixing mold 120 has not moved. The moving block 430 is slidably connected to the fixing block 410. The sliding direction is perpendicular to the sliding direction of the fixing mold 120. The moving block 430 has a first inclined surface with a preset inclination angle on the side facing the fixing mold 120. The fixing mold 120 has a second inclined surface matching the first inclined surface at the corresponding position. The first inclined surface and the second inclined surface can form an abutment. The drive rod 440 is a rod-shaped structure with external threads on its surface. It is connected to the moving block 430 by the threads. When the drive rod 440 is rotated, the thread transmission will drive the moving block 430 to move along the preset sliding direction on the fixed block 410.

[0049] When it is necessary to increase the movement displacement of the bending film 130, the drive rod 440 is rotated in the forward direction, causing it to drive the moving block 430 to slide away from the axis of the fixed mold 120. At this time, the unidirectional structure of the first take-up roller 210 restricts the rotation of the first take-up roller 210.

[0050] When the sheet 510 is bent, the bending film 130 is released from the first take-up roller 210 and the second take-up roller 220 under the action of the sheet 510. After the moving mold completes the bending of the sheet 510, the moving mold continues to push the fixed mold 120, causing it to slide within the fixed block 410 against the elastic force of the support spring 420. This causes the fixed mold 120 to deviate from its initial position. As the moving block 430 slides away from the fixed mold 120, the moving mold needs to drive the fixed mold 120 to move a large displacement so that the second inclined surface on the fixed mold 120 abuts against the first inclined surface on the moving block 430. When the first inclined surface abuts against the second inclined surface, the relative position between the fixed mold 120 and the first take-up roller 210 and the second take-up roller 220 changes, and the movement displacement of the bending film 130 increases. Subsequently, the moving mold moves away from the fixed mold 120 along a preset trajectory, and the elastic force of the support spring 420 pushes the fixed mold 120 back to its initial position. Since the first take-up roller 210 can only release the bending film 130 in one direction, the second take-up roller 220, under the action of the second torsion spring, completely retracts the bending film 130 released during the bending process.

[0051] Similarly, when it is necessary to reduce the movement displacement of the bending film 130, the drive rod 440 is rotated in the opposite direction, and the moving block 430 slides towards the axis of the fixed mold 120. The relative position change between the fixed mold 120 and the first winding roller 210 and the second winding roller 220 is reduced, and the movement displacement of the bending film 130 is reduced accordingly.

[0052] Therefore, by adjusting the components, the relative positions of the fixed mold 120 and the first take-up roller 210 and the second take-up roller 220 can be adjusted, thereby precisely changing the moving length of the bending film 130 each time. When there are too many impurities on the surface of the batch of sheet material 510, by increasing the displacement of the bending film 130, it can be ensured that the impurities attached to the surface of the bending film 130 are completely removed, avoiding the impact of impurity residue on the subsequent processing of the sheet material 510; for sheet material 510 with fewer impurities, the movement displacement of the bending film 130 can be reduced, reducing the consumption of the bending film 130 and extending its service life.

[0053] In other embodiments without the moving block 430, the movement displacement of the bending film 130 on the first take-up roller 210 and the second take-up roller 220 can be adjusted by controlling the displacement of the moving mold.

[0054] When it is necessary to increase the movement displacement of the bending film 130, the displacement of the moving mold towards the fixed mold 120 is increased. After the movement displacement of the moving mold increases, the stroke of the pressure applied to the sheet 510 is extended, which pushes the fixed mold 120 to generate a larger relative position with the first take-up roller 210 and the second take-up roller 220, thereby causing the bending film 130 to synchronously generate a larger movement displacement. Similarly, when it is necessary to decrease the movement displacement of the bending film 130, the displacement of the moving mold towards the fixed mold 120 is decreased. After the movement displacement of the moving mold decreases, the relative position of the fixed mold 120 with the first take-up roller 210 and the second take-up roller 220 decreases accordingly, reducing the movement displacement of the bending film 130.

[0055] Furthermore, two movable blocks 430 are provided, both of which are connected to the drive rod 440 by threads. The threads of the two movable blocks 430 and the drive rod 440 are in opposite directions, so that when the drive rod 440 rotates, the two movable blocks 430 can slide synchronously in opposite directions. The two movable blocks 430 have the same structure, both being block-shaped components with inclined surfaces, and the first inclined surface of one movable block 430 abuts against the second inclined surface on one side of the fixed mold 120.

[0056] When it is necessary to increase the movement displacement of the bending film 130, the drive rod 440 is rotated in the forward direction. Since the threads of the two moving blocks 430 are opposite to those of the drive rod 440, the forward rotation of the drive rod 440 will cause the two moving blocks 430 to slide synchronously along the axis of the drive rod 440 away from the axis of the fixed mold 120. Similarly, when it is necessary to decrease the movement displacement of the bending film 130, the drive rod 440 is rotated in the reverse direction, and the two moving blocks 430 slide synchronously along the axis of the drive rod 440 towards the axis of the fixed mold 120.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A precision bending die for metal processing, characterized in that, include: A fixed mold is provided with a bending part, which is used to provide a bending profile for the sheet metal. A bending film can be placed on the surface of the bending part to prevent the sheet metal from directly contacting the surface of the bending part. A movable mold, which can move closer to or further away from the fixed mold, wherein when the movable mold moves closer to the fixed mold, the movable mold and the fixed mold can bend the sheet metal; A support assembly is provided that can gradually relax the bending film as the moving mold moves toward the fixed mold, so that the bending film conforms to the bending profile, and the support assembly can also re-tension the bending film as the moving mold moves away from the fixed mold.

2. The precision bending die for metal processing according to claim 1, characterized in that, The support assembly includes a first take-up roller and a second take-up roller, which are rotatably connected to both ends of the fixed mold, and the two ends of the bending film are respectively wound around the first take-up roller and the second take-up roller. The first take-up roller is provided with a first elastic element, and the second take-up roller is provided with a second elastic element. The first elastic element and the second elastic element always cause the first take-up roller and the second take-up roller to rotate in a direction away from the axis of the fixed mold, so that the bending film gradually relaxes when the moving mold approaches the fixed mold, and is tightened again when the moving mold moves away from the fixed mold.

3. The precision bending die for metal processing according to claim 2, characterized in that, It also includes a movable component, which is used to replace the bending film on the fixed mold after a sheet has been bent.

4. The precision bending die for metal processing according to claim 3, characterized in that, The moving component includes a unidirectional structure that restricts the bending film to move only toward either the first take-up roller or the second take-up roller.

5. The precision bending die for metal processing according to claim 4, characterized in that, The unidirectional structure is configured in two sets. One set of the unidirectional structure is used to restrict the bending film to move only towards the second take-up roller, and the other set of the unidirectional structure is used to restrict the bending film to move only towards the first take-up roller. The moving component also includes two sets of control structures, which are used to switch the action state of the two sets of unidirectional structures on the bending film respectively.

6. The precision bending die for metal processing according to claim 5, characterized in that, Each set of unidirectional structures includes a unidirectional gear, a locking rod, and a third elastic element. The unidirectional gear is coaxially fixedly connected to one end of the first take-up roller or the second take-up roller. The locking rod is slidably connected to the fixed mold, and one end of the locking rod is engaged with the unidirectional gear so that the unidirectional gear rotates in a single direction around its own axis. The elastic force of the third elastic element always causes the locking rod to engage with the unidirectional gear.

7. The precision bending die for metal processing according to claim 6, characterized in that, Each control structure includes a locking pin and a fourth elastic element. The end of the locking rod away from the one-way gear has a through hole, and the locking pin coaxially passes through the through hole. The fixed mold has a stop groove. When the axis of the stop groove and the axis of the locking pin are collinear, one end of the locking pin can be embedded in the stop groove. The fourth elastic element is located between the locking pin and the locking rod. When the axis of the stop groove and the axis of the locking pin are collinear, the elastic force of the fourth elastic element always causes the locking pin to be embedded in the stop groove.

8. The precision bending die for metal processing according to claim 4, characterized in that, It also includes an adjustment component, which is used to adjust the movement displacement of the bending film on the first take-up roller and the second take-up roller after a sheet material has been bent.

9. The precision bending die for metal processing according to claim 8, characterized in that, The adjusting assembly includes a fixed block and a supporting elastic element. The first winding roller and the second winding roller are rotatably connected to both ends of the fixed block. The fixed block is disposed outside the fixed mold. The fixed mold can slide within the fixed block so that the first winding roller and the second winding roller are relative to the fixed mold. The elastic force of the supporting elastic element always keeps the fixed mold in its initial position within the fixed block.

10. The precision bending die for metal processing according to claim 9, characterized in that, The adjustment component further includes a movable block, which is slidably connected to the fixed block and slides in a direction perpendicular to the sliding direction of the fixed mold. The movable block can abut against the fixed mold via an inclined surface, and slides on the fixed block to adjust the displacement of the fixed mold on the fixed block.

Images