A precise bending die for metal working

Abstract

The application relates to the field of metal processing protection, in particular to a precision bending die for metal processing, which comprises a supporting assembly. The supporting assembly can adapt to the stretching demand of the bending film. When the moving die approaches the fixed die, the supporting assembly gradually relaxes the bending film, so that the bending film can completely match the bending contour of the fixed die. When the moving die moves away from the fixed die, the supporting assembly can again tension the bending film. The supporting assembly provides continuous and stable tension for the bending film, avoids wrinkle generation, and makes the plate surface not appear indentation and scratch due to the wrinkle, so that the plate surface quality is obviously improved. Meanwhile, the contact gap and stress distribution abnormality caused by the wrinkle of the bending film are eliminated, so that the plate can be shaped and deformed according to the bending contour in the bending process, and the plate surface is uniformly and effectively protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metal processing protection, in particular to a precision bending die for metal processing. BACKGROUND

[0002] The bending film is a protective material used in the bending process of metal plates, which can prevent scratches and indentations on the plates, and avoid coating wear and surface contamination. When using, the plate needs to be cleaned first, the die is moved and fixed, the bending film of appropriate size is cut and placed flat or pasted on the corresponding position of the fixed die, and then the moving die is driven to process the plate. After completion, the bending film is removed, and the intact bending film can be reused.

[0003] However, in the prior art, the bending film is unevenly stressed at each part during bending, and the degree of tensile deformation varies. Especially in the stress concentration area of bending round corners, the bending film will form wrinkles due to excessive stretching or local stacking. Under the action of bending pressure, the wrinkled part of the bending film will directly cause indentations and scratches on the surface of the plate, damaging its appearance quality and protective performance. At the same time, the wrinkles of the bending film will also cause abnormal contact gap and stress distribution, interfere with the plastic deformation trajectory of the plate, and thus affect the dimensional accuracy of the plate after bending, causing product tolerance out-of-tolerance, reduced assembly compatibility and other problems. SUMMARY

[0004] Therefore, it is necessary to provide a precision bending die for metal processing to solve the problem that the bending film is prone to wrinkles during the bending process of the plate.

[0005] The above-mentioned purpose is achieved by the following technical solutions:

[0006] A precision bending die for metal processing, comprising:

[0007] A fixed die, the fixed die is provided with a bending part, the bending part is used to provide a bending contour for the plate, and the surface of the bending part can place a bending film, which is used to prevent the plate from directly contacting the surface of the bending part;

[0008] A moving die, the moving die can approach or move away from the fixed die, when the moving die approaches the fixed die, the moving die and the fixed die can bend the plate;

[0009] A support assembly, the support assembly can gradually relax the bending film when the moving die approaches the fixed die, so that the bending film fits the bending contour, and the support assembly can also tension the bending film again when the moving die moves away from the fixed die.

[0010] Further, the support assembly comprises a first winding roller and a second winding roller, which are rotationally connected to two ends of the fixed mold respectively, and two ends of the bending film are wound around the first winding roller and the second winding roller respectively.

[0011] The first winding roller is provided with a first elastic member, and the second winding roller is provided with a second elastic member, so that the first winding roller and the second winding roller rotate towards the 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 tensioned again when the moving mold moves away from the fixed mold.

[0012] Further, the moving assembly is further provided, which is used to replace the bending film on the fixed mold after a plate is bent.

[0013] Further, the moving assembly comprises a one-way structure, which is used to limit the movement of the bending film to the direction of the first winding roller or the second winding roller.

[0014] Further, the one-way structure is provided in two groups, one group of the one-way structure is used to limit the movement of the bending film to the direction of the second winding roller, and the other group of the one-way structure is used to limit the movement of the bending film to the direction of the first winding roller; the moving assembly further comprises two groups of control structures, which are used to switch the action state of the two groups of one-way structures on the bending film respectively.

[0015] Further, each group of the one-way structure comprises a one-way gear, a lock rod and a third elastic member, the one-way gear is coaxially fixedly connected to one end of the first winding roller or the second winding roller; the lock rod is slidingly connected to the fixed mold, one end of the lock rod is clamped with the one-way gear, so that the one-way gear rotates around its axis in a single direction; the third elastic member always makes the lock rod clamped with the one-way gear.

[0016] Further, each group of the control structure comprises a locking pin and a fourth elastic member, one end of the lock rod away from the one-way gear is provided with a through hole, the locking pin is coaxially penetrated through the through hole; the fixed mold is provided with a stop groove, when the axis of the locking pin is collinear with the stop groove, one end of the locking pin can be embedded in the stop groove; the fourth elastic member is located between the locking pin and the lock rod, when the axis of the locking pin is collinear with the stop groove, the elastic force of the fourth elastic member always makes the locking pin embedded in the stop groove.

[0017] Further, the adjusting assembly is used to adjust the movement displacement of the bending film on the first winding roller and the second winding roller after the plate is completely bent.

[0018] Further, the adjusting assembly comprises a fixed block and a supporting elastic element, the first winding roller and the second winding roller are respectively rotationally connected to two ends of the fixed block, the fixed block is arranged outside the fixed die, the fixed die can slide in the fixed block, so that the first winding roller and the second winding roller are relatively displaced with the fixed die; the elastic force of the supporting elastic element is total to make the fixed die be located at an initial position in the fixed block.

[0019] Further, the adjusting assembly further comprises a moving block, the moving block is slidingly connected to the fixed block, and the sliding direction of the moving block is perpendicular to the sliding direction of the fixed die, the moving block can abut against the fixed die through an inclined surface, and the moving block slides on the fixed block to adjust the displacement of the fixed die sliding on the fixed block.

[0020] The beneficial effects of the present application are:

[0021] The present application provides a precision bending die for metal processing, which comprises a supporting assembly. During the bending process of the plate, the supporting assembly can adapt to the stretching demand of the bending film. When the moving die approaches the fixed die, the supporting assembly gradually relaxes the bending film, so that the bending film can completely fit the bending contour of the fixed die. When the moving die moves away from the fixed die, the supporting assembly can also tension the bending film again. The supporting assembly provides continuous and stable tension for the bending film, avoids the appearance of indentation and scratch on the surface of the plate due to the wrinkles of the bending film, and significantly improves the surface quality of the plate. At the same time, since the bending film has no wrinkles, the contact gap between the bending film and the plate caused by the wrinkles is eliminated, and the abnormal local stress distribution caused by the wrinkles is also eliminated, so that the plate can be strictly shaped and deformed according to the bending contour during the bending process. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A structure schematic diagram of a precision bending die for metal processing provided by the embodiment of the present application is shown in FIG. 1.

[0023] Figure 2 A front view of the structure shown in FIG. 1 is shown in FIG. 2. Figure 1 A front view of the structure shown in FIG. 1 when bending the plate is shown in FIG. 3.

[0024] Figure 3 A front view of the structure shown in FIG. 1 when bending the plate is shown in FIG. 3. Figure 1 A front view of the structure shown in FIG. 1 when bending the plate is shown in FIG. 3.

[0025] Figure 4 A side view of the structure shown in FIG. 1 is shown in FIG. 4. Figure 1 A side view of the structure shown in FIG. 1 is shown in FIG. 4.

[0026] Figure 5 is Figure 4 a sectional view in the direction of A-A;

[0027] Figure 6 is Figure 4 a sectional view in the direction of B-B;

[0028] Figure 7 is Figure 4 a close-up view at C;

[0029] Figure 8 is Figure 6 a close-up view at D.

[0030] wherein:

[0031] 110, base; 120, fixed mold; 130, bending film;

[0032] 210, first winding roller; 220, second winding roller;

[0033] 310, one-way gear; 320, locking rod; 321, mounting plate; 330, third spring; 340, locking pin; 350, fourth spring; 360, stop groove;

[0034] 410, fixed block; 420, supporting spring; 430, moving block; 440, driving rod;

[0035] 510, plate. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with examples and in conjunction with the drawings. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0037] The serial numbers of components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. And the "connection" and "coupling" of the present application, unless otherwise specified, include direct and indirect connection (coupling). In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature is "on", "above" and "over" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0039] The following refers to Figures 1 to 8 An embodiment of the present application provides a precision bending die for metal processing.

[0040] An embodiment of the present application provides a precision bending die for metal processing.

[0041] The base 110 is placed on a fixed support surface and has stable support capability, and is used for providing a stable mounting basis for other components.

[0042] The fixed die 120 is detachably mounted on the base 110, and the fixed die 120 is provided with a bending part, which is used for providing a bending contour for the plate, so that the plate 510 can be deformed according to the bending contour in the bending process.

[0043] The moving die is a forming structure matched with the fixed die 120, and the area between the moving die and the fixed die 120 is used for placing the plate to be bent 510. The moving die can be close to or away from the fixed die 120, and when the moving die is close to the fixed die 120, the moving die and the fixed die can bend the plate 510.

[0044] The bending film 130 is a thin film with flexibility and wear resistance, which is placed on the surface of the bending part of the fixed die 120 and covers between the plate to be processed 510 and the fixed die 120, and is used for avoiding the plate 510 and the bending part of the fixed die 120 to directly contact and produce indentation and scratch.

[0045] The support assembly comprises a first winding roller 210 and a second winding roller 220. Both the first winding roller 210 and the second winding roller 220 are cylindrical roller structures, and are rotationally connected to two ends of the fixed mold 120 respectively, and can freely rotate around their own axes. The two ends of the bending film 130 are wound around the first winding roller 210 and the second winding roller 220 respectively. The first winding roller 210 is provided with a first elastic member, which is a first torsion spring. The elastic force of the first torsion spring always acts in a direction that makes the first winding roller 210 rotate away from the axis of the fixed mold 120. The second winding roller 220 is provided with a second elastic member, which is a second torsion spring. The elastic force of the second torsion spring always acts in a direction that makes the second winding roller 220 rotate away from the axis of the fixed mold 120.

[0046] In the initial state, under the action of the first torsion spring and the second torsion spring, the first winding roller 210 and the second winding roller 220 always have a tendency to rotate away from the axis of the fixed mold 120, so that the first winding roller 210 and the second winding roller 220 continuously generate tension on the two ends of the bending film 130, thereby tensioning the bending film 130.

[0047] In use, first, the plate to be bent 510 is placed in the area between the fixed mold 120 and the movable mold. At this time, the bending film 130 covers between the plate 510 and the fixed mold 120. Then the movable mold approaches the fixed mold 120 according to the preset trajectory, and applies uniform and constant pressure to the plate 510. The plate 510 begins to bend and deform under the joint action of the fixed mold 120 and the movable mold. During the process of the movable mold bending the plate 510, as the plate 510 bends and deforms, the bending film 130 will stretch following the deformation of the plate 510. At this time, the first winding roller 210 will overcome the elastic force of the first torsion spring and rotate towards the axis of the fixed mold 120, and the second winding roller 220 will overcome the elastic force of the second torsion spring and rotate towards the axis of the fixed mold 120. The first winding roller 210 and the second winding roller 220 release the length of the bending film 130 required for stretching by rotating, ensuring that the bending film 130 can completely fit the bending contour. Because the first torsion spring always maintains the elastic force on the first winding roller 210, and the second torsion spring always maintains the elastic force on the second winding roller 220, these elastic forces will continuously act on the bending film 130, so that the bending film 130 does not produce wrinkles.

[0048] When the bending process of the plate 510 is completed, the moving die moves away from the fixed die 120 according to a preset track, at this time, the first torsional spring can drive the first winding roller 210 to rotate towards the direction away from the axis of the fixed die 120, and the second torsional spring can drive the second winding roller 220 to rotate towards the direction away from the axis of the fixed die 120, so as to completely wind up the bending film 130 released in the bending process, and tension the bending film 130 again, thereby completing a complete plate 510 bending operation.

[0049] Therefore, by tensioning the bending film 130 through the first winding roller 210 and the second winding roller 220 after the plate 510 is bent, the generation of wrinkles of the bending film 130 is effectively avoided, so that the plate 510 after bending does not have pressure marks and scratches on the surface caused by wrinkles of the bending film 130, and the surface quality is significantly improved. At the same time, the size accuracy of the plate 510 after bending is effectively guaranteed, and the tolerance can be controlled within the design requirement range, and the assembly adaptability is good.

[0050] In one embodiment, since the bending film 130 is easy to attach impurities on the surface after being used for many times and may be locally damaged, if not handled in time, the impurities will cause pressure marks on the surface of the plate 510 in the subsequent bending process, and the damaged part cannot effectively protect the plate 510, resulting in scratches on the surface of the plate 510.

[0051] Therefore, the precision bending die for metal processing provided by the embodiment of the application further comprises a moving assembly, which is used to drive the bending film 130 on the fixed die 120 to displace after a plate 510 is bent, so as to realize replacement of the bending film 130 on the fixed die 120.

[0052] The moving assembly comprises a one-way structure, which can limit the bending film 130 to move only in the direction of the second winding roller 220, that is, the second winding roller 220 can perform winding and releasing actions, and the first winding roller 210 can only perform a releasing action.

[0053] The one-way structure comprises a one-way gear 310, a lock rod 320, a mounting plate 321 and a third elastic member.

[0054] The one-way gear 310 is a gear structure with a one-way tooth shape, coaxially fixedly connected to one end of the first winding 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 lock rod 320 is a rod structure, the other end of which is slidingly connected to the mounting plate 321, and the sliding direction of the lock rod 320 is perpendicular to the axis of the one-way gear 310. One end of the lock rod 320 is processed with a clamping part matched with the tooth shape of the one-way gear 310, and the clamping part and the tooth groove of the one-way gear 310 form a clamping fit, and the one-way gear 310 can only rotate around its own axis in a single direction through the clamping relationship. When the one-way gear 310 tries to rotate in the opposite direction, the clamping part of the lock rod 320 will be embedded in the tooth groove and prevent it from rotating. The third elastic member is a third spring 330, one end of which is fixedly connected to the mounting plate 321, and the other end is fixedly connected to the lock rod 320. When it is necessary to move the bending film 130 towards the direction of the second winding roller 220, the elastic force of the third spring 330 drives the lock rod 320 to slide towards the one-way gear 310 at the end of the first winding roller 210, and the clamping part of the lock rod 320 forms a clamping with the one-way gear 310 at the end of the first winding roller 210, limiting the first winding roller 210 to rotate only in the direction of releasing the bending film 130.

[0055] When the plate 510 is bent, the first winding roller 210 and the second winding roller 220 will release the length of the bending film 130 required for stretching by rotating to ensure that the bending film 130 can completely fit the bending profile. When the bending process of the plate 510 is completed, the moving mold moves away from the fixed mold 120 according to the preset trajectory, at this time, since the first winding roller 210 can only release the bending film 130 in one direction, therefore, the second winding roller 220 completely retracts the bending film 130 released during the bending process under the action of the second torsional spring, realizing the movement of the bending film 130 towards the second winding roller 220. Thus, after each bending of the plate 510 is completed, the bending film 130 completes a certain distance of directional movement.

[0056] Therefore, through the one-way structure, the bending film 130 can only move stably in the preset direction, and through the synchronous driving of the bending film 130 during the bending process of the plate 510, the impurities on the surface of the bending film 130 can be effectively removed during the movement, and the damaged parts can be observed and processed in time, completely avoiding the problems of surface indentation and scratches of the plate 510 caused by impurities and damage. At the same time, the surface renewal of the bending film 130 can be completed without manual intervention, significantly improving the production efficiency and ensuring the continuity of the processing process.

[0057] It can be understood that the one-way structure can also be used to limit the bending film 130 to move only towards the direction of the first winding roller 210, that is, the first winding roller 210 can perform winding and releasing actions, and the second winding roller 220 can only perform releasing actions.

[0058] Specifically, the one-way gear 310 is coaxially fixedly connected to one end of the second winding roller 220. When it is needed to move the bending film 130 towards the direction of the first winding roller 210, the elastic force of the third spring 330 drives the lock rod 320 to slide towards the one-way gear 310 at the end of the second winding roller 220, and the clamping part of the lock rod 320 is clamped with the one-way gear 310 at the end of the second winding roller 220, so as to limit the second winding roller 220 to only rotate in the direction of releasing the bending film 130. After the bending process of the plate 510 is completed, since the second winding roller 220 can only release the bending film 130 in one direction, the first winding roller 210 completely collects the bending film 130 released in the bending process under the action of the first torsion spring, so as to realize the movement of the bending film 130 towards the direction of the first winding roller 210.

[0059] Further, the moving assembly further comprises a control structure. The one-way structure is provided in two groups, one group of the one-way structure is used to limit the bending film 130 to only move towards the direction of the second winding roller 220, that is, the second winding roller 220 can perform winding and releasing actions, and the first winding roller 210 can only perform a releasing action; the other group of the one-way structure is used to limit the bending film 130 to only move towards the direction of the first winding roller 210, that is, the first winding roller 210 can perform winding and releasing actions, and the second winding roller 220 can only perform a releasing action. The control structure is provided in two groups, each group of the control structure is used to switch the action state of one group of the one-way structure on the bending film 130, so that the bending film 130 can move towards the direction of the first winding roller 210 and the direction of the second winding roller 220 through the state switching, thereby realizing the bidirectional use of the bending film 130 and improving the utilization rate of the bending film 130.

[0060] The control structure comprises a locking pin 340, a stop groove 360 and a fourth elastic member. The one end of the locking rod 320 away from the one-way gear 310 is provided with a through hole penetrating through itself, and the axis of the through hole is perpendicular to the sliding direction of the locking rod 320. The locking pin 340 is a cylindrical rod structure, and the diameter of the locking pin 340 is equal to the diameter of the through hole. The locking pin 340 can be coaxially penetrated through the through hole and freely slide in the through hole. The stop groove 360 is a groove structure opened on the surface of the fixed mold 120, and the shape of the stop groove 360 is matched with the shape of the end of the locking pin 340. When the axis of the stop groove 360 and the locking pin 340 is in a collinear state, one end of the locking pin 340 can be completely embedded in the stop groove 360, forming a stable locking fit. The fourth elastic member is a fourth spring 350, which is sleeved outside the locking pin 340 and between the locking pin 340 and the locking rod 320. The elastic force of the fourth spring 350 always acts on the axis of the locking pin 340 towards the direction of the stop groove 360. When the axis of the stop groove 360 and the locking pin 340 is in a collinear state, 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 at a position away from the one-way gear 310.

[0061] In use, when the bending film 130 needs to move towards the direction of the second winding roller 220, the one-way structure corresponding to the first winding roller 210 is kept to limit the first winding roller 210 through a set of control structures, that is, the locking pin 340 on the side of the first winding roller 210 is pulled away from the stop groove 360, the fourth spring 350 is compressed, the locking pin 340 is separated from the stop groove 360, and 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 winding roller 210. The clamping part of the locking rod 320 is clamped with the one-way gear 310 at the end of the first winding roller 210, so that the first winding roller 210 can only rotate in the direction of releasing the bending film 130. At the same time, the one-way structure corresponding to the second winding roller 220 is released to limit the second winding roller 220 through another set of control structures, that is, the locking rod 320 is pulled away from the one-way gear 310, the third spring 330 is compressed, the clamping part of the locking rod 320 is separated from the one-way gear 310 at the end of the second winding roller 220, and the second winding roller 220 can freely rotate. The locking rod 320 continuously moves, and when the axis of the stop groove 360 and the locking pin 340 is in a collinear state, the elastic force of the fourth spring 350 drives the locking pin 340 to slide towards the stop groove 360, so that the locking pin 340 on the side of the second winding roller 220 is embedded in the stop groove 360. At this time, the second winding roller 220 can perform winding and releasing actions, and the first winding roller 210 can only perform releasing action.

[0062] Similarly, when the bending film 130 needs to move towards the direction of the first winding roller 210, the restriction of the one-way structure corresponding to the second winding roller 220 on the second winding roller 220 is released through one set of control structures, and the restriction of the one-way structure corresponding to the first winding roller 210 on the first winding roller 210 is released through the other set of control structures.

[0063] Therefore, the state switching of the two sets of one-way structures is realized through the two sets of control structures, the bending film 130 can move in two directions, the bending film 130 can be fully utilized multiple times, the cost of consumables is reduced, and the utilization rate of the bending film 130 is improved.

[0064] In one of the embodiments, when the plate 510 has too much impurities, the fixed displacement is not enough to completely discharge the impurities. Based on this, the precision bending die for metal processing provided by the embodiment of the present application further comprises an adjusting assembly, which is used to adjust the movement displacement of the bending film 130 on the first winding roller 210 and the second winding roller 220 after one plate 510 is bent,

[0065] Specifically, the adjusting assembly comprises a fixed block 410, a supporting elastic piece, a moving block 430 and a driving rod 440.

[0066] The fixed block 410 is fixedly connected to the base 110, and the fixed block 410 is arranged outside the fixed die 120, and the fixed die 120 can freely slide along the axis direction of the fixed die 120 in the fixed block 410. The first winding roller 210 and the second winding roller 220 are no longer directly rotationally connected to the fixed die 120, but are rotationally connected to the two ends of the fixed block 410, respectively. The supporting elastic piece is a supporting spring 420, one end of the supporting spring 420 is fixedly connected to the fixed block 410, and the other end is fixedly connected to one end of the fixed die 120. The elastic force of the supporting spring 420 always drives the fixed die 120 to move towards the direction of the initial position, and the initial position is the reference position when the fixed die 120 does not displace. The moving block 430 is slidingly connected to the fixed block 410, and the sliding direction is perpendicular to the sliding direction of the fixed die 120. The side of the moving block 430 facing the fixed die 120 is provided with a first inclined surface with a preset inclination angle, and the corresponding position of the fixed die 120 is provided with a second inclined surface matched with the first inclined surface, and the first inclined surface and the second inclined surface can abut. The driving rod 440 is a rod-shaped structure with external threads on the surface, which is connected to the moving block 430 through threads. When the driving rod 440 is rotated, the threaded transmission will drive the moving block 430 to move on the fixed block 410 along the preset sliding direction.

[0067] When it is necessary to increase the movement displacement of the bending film 130, the driving rod 440 is rotated in the forward direction, so as to drive the moving block 430 to slide away from the axis of the fixed die 120. At this time, the one-way structure of the first winding roller 210 restricts the rotation of the first winding roller 210.

[0068] When the plate 510 is bent, the bending film 130 is released from the first winding roller 210 and the second winding roller 220 under the driving of the plate 510. After the moving die completes the bending of the plate 510, the moving die continues to push the fixed die 120 to slide in the fixed block 410 against the elastic force of the supporting spring 420, so that the fixed die 120 deviates from the initial position. Since the moving block 430 slides away from the fixed die 120, the moving die needs to drive the fixed die 120 to move a larger displacement, so that the second inclined surface on the fixed die 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 die 120 and the first winding roller 210 and the second winding roller 220 changes, and the movement displacement of the bending film 130 increases. Subsequently, the moving die moves away from the fixed die 120 according to the preset trajectory, and the elastic force of the supporting spring 420 pushes the fixed die 120 to reset to the initial position. Since the first winding roller 210 can only release the bending film 130 in one direction, the second winding roller 220 completely winds up the bending film 130 released in the bending process under the action of the second torsion spring.

[0069] Similarly, when it is necessary to reduce the movement displacement of the bending film 130, the drive rod 440 is reversely rotated, and the moving block 430 slides towards the axis of the fixed die 120, so that the relative position between the fixed die 120 and the first winding roller 210 and the second winding roller 220 changes, and the movement displacement of the bending film 130 correspondingly reduces.

[0070] Therefore, the adjustment assembly is used to adjust the relative position between the fixed die 120 and the first winding roller 210 and the second winding roller 220, so as to accurately change the moving length of the bending film 130 each time. When the surface of the batch of plates 510 has too much impurities, the movement displacement of the bending film 130 is increased, so that the impurities attached to the surface of the bending film 130 can be completely discharged, and the influence of the residual impurities on the subsequent processing of the plate 510 is avoided. For the plate 510 with less impurities, the movement displacement of the bending film 130 can be reduced, the consumption of the bending film 130 is reduced, and the service life of the bending film 130 is prolonged.

[0071] In other embodiments without the moving block 430, the movement displacement of the moving die can be controlled to adjust the movement displacement of the bending film 130 on the first winding roller 210 and the second winding roller 220.

[0072] When it is required to increase the movement displacement of the bending film 130, the displacement of the moving die moving towards the fixed die 120 is increased. After the displacement of the moving die is increased, the pressure acting on the plate 510 is prolonged, which can push the fixed die 120 to generate a larger relative position with the first winding roller 210 and the second winding roller 220, and further drive the bending film 130 to generate a larger movement displacement. Similarly, when it is required to reduce the movement displacement of the bending film 130, the displacement of the moving die moving towards the fixed die 120 is reduced. After the displacement of the moving die is reduced, the relative position of the fixed die 120 with the first winding roller 210 and the second winding roller 220 is reduced, and the movement displacement of the bending film 130 is reduced.

[0073] Further, the moving blocks 430 are provided as two, and the two moving blocks 430 are connected with the driving rod 440 through threads, and the threads of the two moving blocks 430 cooperating with the driving rod 440 are opposite in direction. When the driving rod 440 rotates, the two moving blocks 430 can synchronously slide in opposite directions. The two moving blocks 430 are consistent in structure, and are both block-shaped members with inclined surfaces, and the first inclined surface of one moving block 430 abuts against the second inclined surface of one side of the fixed die 120.

[0074] When it is required to increase the movement displacement of the bending film 130, the driving rod 440 is rotated in a forward direction. Since the threads of the two moving blocks 430 cooperating with the driving rod 440 are opposite in direction, the forward rotation of the driving rod 440 can drive the two moving blocks 430 to synchronously slide along the axis of the driving rod 440 in a direction away from the axis of the fixed die 120. Similarly, when it is required to reduce the movement displacement of the bending film 130, the driving rod 440 is rotated in a reverse direction, and the two moving blocks 430 synchronously slide along the axis of the driving rod 440 in a direction close to the axis of the fixed die 120.

[0075] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they shall be considered as the scope of the present disclosure.

[0076] The above embodiments only express several implementation manners of the present disclosure, and the description is more specific and detailed, but it shall not be understood as the limitation on the scope of the present disclosure. It should be noted that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present disclosure, and these shall be considered as the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the appended claims.

Claims

1. A precision bending die for metal processing, characterized in that, The utility model relates to a bending device for plate, comprising: a fixed mold provided with a bending part for providing a bending profile for a plate, the surface of the bending part being capable of placing a bending film for preventing the plate from directly contacting the surface of the bending part; a movable mold capable of approaching or moving away from the fixed mold, the movable mold and the fixed mold being capable of bending the plate when the movable mold approaches the fixed mold; a support assembly capable of gradually relaxing the bending film when the movable mold approaches the fixed mold so that the bending film fits the bending profile, and capable of again tensioning the bending film when the movable mold moves away from the fixed mold; the support assembly comprises first and second winding rollers rotatably connected to the two ends of the fixed mold, and the two ends of the bending film are wound around the first and second winding rollers respectively; the first winding roller is provided with a first elastic member, and the second winding roller is provided with a second elastic member; the first and second elastic members always make the first and second winding rollers rotate towards the direction away from the axis of the fixed mold so that the bending film is gradually relaxed when the movable mold approaches the fixed mold and is again tensioned when the movable mold moves away from the fixed mold; a moving assembly for replacing the bending film on the fixed mold after a plate is bent; the moving assembly comprises a one-way structure for limiting the bending film to move only towards the direction of the first winding roller or the second winding roller; the one-way structure is provided in two groups, one group of the one-way structure is used for limiting the bending film to move only towards the direction of the second winding roller, and the other group of the one-way structure is used for limiting the bending film to move only towards the direction of the first winding roller; the moving assembly further comprises two groups of control structures for respectively switching the action state of the two groups of one-way structures on the bending film; each group of the one-way structure comprises a one-way gear coaxially fixedly connected to one end of the first winding roller or the second winding roller, a lock rod slidingly connected to the fixed mold, and a third elastic member; one end of the lock rod is clamped with the one-way gear so that the one-way gear rotates around its axis in a single direction; the elastic force of the third elastic member always makes the lock rod clamped with the one-way gear.

2. The precision bending die for metal working according to claim 1, characterized by Each group of the control structure comprises a locking pin and a fourth elastic member; one end of the lock rod away from the one-way gear is provided with a through hole, and the locking pin is coaxially penetrated through the through hole; the fixed mold is provided with a stop groove; when the axis of the locking pin is collinear with the stop groove, one end of the locking pin can be embedded in the stop groove; the fourth elastic member is located between the locking pin and the lock rod; when the axis of the locking pin is collinear with the stop groove, the elastic force of the fourth elastic member always makes the locking pin embedded in the stop groove.

3. The precision bending die for metal working according to claim 1, characterized by The adjusting assembly is used to adjust the movement displacement of the bending film on the first winding roller and the second winding roller after a plate is completely bent.

4. The precision bending die for metal working according to claim 3, characterized by The adjusting assembly comprises a fixed block and a supporting elastic element, the first winding roller and the second winding roller are respectively rotatably connected to two ends of the fixed block, the fixed block is arranged outside the fixed mold, the fixed mold can slide in the fixed block, so that the first winding roller and the second winding roller are relatively displaced with the fixed mold; the elastic force of the supporting elastic element is used to make the fixed mold be located at an initial position in the fixed block.

5. The precision bending die for metal working according to claim 4, characterized by The adjusting assembly further comprises a moving block, the moving block is slidably connected to the fixed block, and the sliding direction of the moving block is perpendicular to the sliding direction of the fixed mold, the moving block can abut against the fixed mold through an inclined surface, and the moving block slides on the fixed block to adjust the displacement of the fixed mold sliding on the fixed block.

Images