A continuous stamping die system cantilever bending and stripping mechanism

Abstract

The application discloses a continuous stamping die system cantilever bending and stripping mechanism, which is used for realizing large-angle bending of a pre-bending elastic sheet blank and smooth feeding of a product material belt. The mechanism comprises a cantilever forming assembly movably combined with a lower die, a bending slide movably combined with the cantilever forming assembly, a bending recess die cantilever structure formed at one end of the bending slide, a contract block movably combined with the cantilever forming assembly, an elastic sheet bending side pushing slide movably combined with the lower die, a cantilever bridge pressing block combined with an upper die, an insert knife combined with the upper die, and the cantilever bridge pressing block drives the contract block to move in a negative direction along a Y axis when the upper die and the lower die are combined, and the insert knife drives the elastic sheet bending side pushing slide to move along a direction of the Y axis and approach the bending recess die cantilever structure, the contract block can drive the bending slide to move along a direction of an X axis when the contract block moves in the negative direction along the Y axis, and the bending slide resets along the X axis when the contract block moves in a positive direction along the Y axis.

Description

Technical Field

[0001] This application relates to a mold structure, specifically to a cantilever bending and stripping mechanism for a continuous stamping mold system. Background Technology

[0002] In metal stamping products, many products incorporate spring clips that need to be folded back, with varying bending lines. In continuous stamping bending processes, the product strip needs to be fed smoothly and continuously within the die cavity. Therefore, these folded spring clip structures cannot be formed using typical straight-up-down punch and die parts. Often, the forming die part needs to be designed as a "duckbill" cantilever structure to provide sufficient clearance for the spring clip during forming and after bending. This means that after bending, the folded spring clip will form a line with the strip plane. The shaped jaw structure hooks onto the cantilever of the forming die. When the bending line of the spring is parallel to the feed direction of the strip, a single spring structure... Although the jaws are hooked onto the die cantilever, at the moment the feed motion begins after the strip floats up, due to the springback from bending and the gap between the guide and the strip, this... The jaw structure will retract slightly, so it is not enough to grip the die cantilever.

[0003] However, the situation is quite different for a symmetrical, double-sided, reverse-folding spring structure. The forming of a symmetrical, double-sided, reverse-folding spring naturally requires symmetrical cantilever bending parts. After bending and forming, a pair of... The jaw structure hooks onto two symmetrical die cantilever arms. Although it also has bending springback... The jaws do not adhere tightly to the cantilevered die, but the double-sided hooks prevent the material feed gap between the guide and the strip from shifting to either side. In this case, although there is a slight actual gap between the product and the cantilevered die components, any minute tilt deviation will cause one side to shift when the strip begins to feed within the die cavity. The jaws of the jaws scraped against the cantilever of the die first. Meanwhile, on one side... If the jaws of the die scrape against the die cantilever, it will cause the strip to tilt even more significantly. This greater tilt will quickly lead to further tilting on the other side. The jaws of the jaws scrape against the corresponding die cantilever. This repeated effect affects both sides. The jaws, on their respective corresponding die cantilever arms, move forward in a stumbling, pulling, and tugging motion.

[0004] This can easily cause two things that already have a slight gap to... The clamping jaws tightly grip the two die cantilever arms, thus hindering the normal movement of the strip material. This process, from the start of the strip's feeding to its immobility, occurs in a very short instant, far shorter than a single feed cycle. Therefore, when this situation occurs, the strip material inevitably cannot move to the correct stamping station in time, resulting in incorrect strip feeding. If the upper die were to strike down in this situation, at best, the strip material would be damaged, requiring machine downtime and impacting production efficiency; at worst, the die itself would be damaged, causing even greater losses. Therefore, this phenomenon of the double-sided anti-fold spring structure gripping the die cantilever arms is indeed a serious safety hazard in stamping production and must be eliminated. Summary of the Invention

[0005] To overcome the shortcomings of the above situation, this application provides a technical solution to solve the above problems.

[0006] To achieve this objective, this application provides the following technical solution:

[0007] A cantilever bending and stripping mechanism for a continuous stamping die system includes:

[0008] The upper and lower dies cooperate with each other and are defined with mutually perpendicular X-axis, Y-axis and Z-axis directions, wherein the positive Y-axis is the opening direction of the upper die relative to the lower die, and the positive Z-axis is the feeding direction of the product strip;

[0009] The cantilever forming assembly is movably connected to the lower mold and can reciprocate relative to the lower mold along the Y-axis. A spatial area for inserting product strip is formed between the cantilever forming assembly and the upper surface of the lower mold.

[0010] At least one bending slider is movably coupled to the cantilever forming assembly and can reciprocate relative to the cantilever forming assembly along the X-axis direction. One end of the bending slider extends along the X-axis direction to form a bending die cantilever structure.

[0011] At least one wedge is movably coupled to the cantilever forming assembly and is capable of reciprocating relative to the cantilever forming assembly along the Y-axis direction. The wedge and the bending slider are engaged by an inclined surface.

[0012] At least one spring sheet bending side push slider is movably connected to the lower die and can reciprocate relative to the lower die along the X-axis direction. The spring sheet bending side push slider and the bending die cantilever structure are arranged opposite to each other along the X-axis direction and form a space between them for accommodating the pre-bent spring sheet blank.

[0013] Cantilever bridge pressure block, combined with the upper mold;

[0014] Insert blade, combined with the upper mold;

[0015] When the upper and lower dies are closed, the cantilever bridge pressure block drives the wedge to move along the negative Y-axis, and the insert drive spring pusher moves towards the bending die cantilever structure along the Y-axis; wherein

[0016] When the wedge moves along the negative Y-axis, it can drive the bending slider to move along the X-axis; when the wedge moves along the positive Y-axis, the bending slider resets along the X-axis.

[0017] Furthermore, it also includes several floating pins, which are movably connected to the lower mold and located directly below the product strip. The floating pins can reciprocate relative to the lower mold along the Y-axis. One end of the floating pin abuts against the lower surface of the product strip. The floating pins can move the product strip together with the cantilever forming assembly relative to the lower mold along the positive Y-axis by a certain distance, so that the product strip together with the cantilever forming assembly is separated from the upper surface of the lower mold.

[0018] Furthermore, a groove runs through the cantilever forming assembly along the Y-axis, and the wedge is slidably fitted into the groove. A spring groove is formed on the inner wall of the groove at a position corresponding to the side wall of the wedge. A floating spring is embedded in the spring groove. The floating spring is set to a pre-compression state, which can continuously provide the wedge with a floating force in the positive Y-axis direction. When the upper mold and the lower mold open, the end of the wedge along the positive Y-axis floats up and extends beyond the upper surface of the cantilever forming assembly.

[0019] Furthermore, the cantilever forming assembly includes a longitudinally elongated crossbeam along the X-axis, two piers respectively disposed below the two ends of the crossbeam along the X-axis, and a cantilever bridge at least partially fixed below the crossbeam along the Y-axis. The two piers are inserted into the recessed frame formed on the upper surface of the lower mold along the negative Y-axis, and the cantilever forming assembly spans across the product strip.

[0020] Furthermore, the cantilever bridge includes an integrally formed load-bearing section and a fixed section. The bending slider is movably connected to the load-bearing section and slides with the load-bearing section through a dovetail groove. The crossbeam is fixedly connected to the fixed section, and the groove is formed on the load-bearing section.

[0021] Furthermore, it also includes a pier pressure plate, which is locked to the upper surface of the lower template by screws. Each pier has a shoulder recessed at the position corresponding to the pier pressure plate. The pier pressure plate is pressed and limited above the shoulder to limit the upward excessive displacement of the pier.

[0022] Furthermore, the upper die also includes a contour support member that protrudes along the negative Y-axis. The lower end face of the contour support member matches the upper surface of the bending die cantilever structure. When the upper die and the lower die are closed, the lower end face of the contour support member can press against the upper surface of the bending die cantilever structure.

[0023] Furthermore, there are two bending sliders, and the end faces of the two bending sliders opposite each other along the X-axis form inclined surfaces that cooperate with the wedge. The wedge is located directly above the two inclined surfaces and has a corresponding mating inclined surface that cooperates with the inclined surfaces.

[0024] Furthermore, it also includes a retraction spring. Spring grooves are recessed on the contact surfaces of the two bending sliders and the cantilever forming assembly. The retraction spring is placed in the spring groove and is set to a pre-compression state. Under the action of the retraction spring, the two bending sliders will continuously be subjected to the thrust from the retraction spring to bring them closer to each other. The inclined surfaces at the ends of the two bending sliders are always in contact with the mating inclined surfaces of the lower section of the wedge.

[0025] Furthermore, the load-bearing section and the spring sheet bending side push slider are both located behind the crossbeam along the positive Z-axis.

[0026] Compared with the prior art, the beneficial effect of this application is that the product material feed is smooth when pre-folding the spring blank at a large angle. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of a cantilever bending and stripping mechanism for a continuous stamping die system according to this application, specifically showing the schematic diagram of the upper and lower dies in the open state.

[0028] Figure 2 yes Figure 1 The figure shows a front view of a cantilever bending and stripping mechanism of a continuous stamping die system along the Y-axis.

[0029] Figure 3 This is a partial exploded perspective view of a cantilever bending and stripping mechanism of a continuous stamping die system according to this application, specifically showing a perspective view of the crossbeam and cantilever bridge after separation from the lower die.

[0030] Figure 4 This is a partial exploded perspective view of a cantilever bending and stripping mechanism of a continuous stamping die system according to this application, specifically showing a perspective view of the crossbeam, the cantilever bridge, one of the bridge piers, and a bridge pier pressure plate after separation from the lower die.

[0031] Figure 5 yes Figure 4 The image shows a front view of a cantilever bending and stripping mechanism of a continuous stamping die system along the Y-axis.

[0032] Figure 6 This is a partial exploded perspective view of a cantilever bending and stripping mechanism of a continuous stamping die system according to this application, specifically showing the crossbeam, cantilever bridge, two piers, and a perspective view of the two pier pressure plates after they are separated from the lower die.

[0033] Figure 7 This is a partial exploded perspective view of a cantilever bending and stripping mechanism of a continuous stamping die system according to this application, specifically showing a three-dimensional schematic diagram of a crossbeam, a cantilever bridge, a pier section, a pier section pressure plate, and a lower template after separation from the lower die.

[0034] Figure 8 This is an exploded perspective view of the upper die of the cantilever bending and stripping mechanism of a continuous stamping die system according to this application.

[0035] Figure 9 This is an exploded perspective view of the lower die of the cantilever bending and stripping mechanism of a continuous stamping die system according to this application.

[0036] Figure 10 yes Figure 9 The image shows a front view of the lower die of a cantilever bending and stripping mechanism in a continuous stamping die system along the Y-axis.

[0037] Figure 11 This is a partial exploded perspective view of a cantilever bending stripping mechanism of a continuous stamping die system according to this application, specifically showing a perspective view of the stripping plate and two cutting tools after they are separated from the upper die.

[0038] Figure 12 This is a partial exploded perspective view of a cantilever bending and stripping mechanism of a continuous stamping die system according to this application, specifically showing a partial exploded perspective view of the upper die.

[0039] Figure 13 yes Figure 2 Enlarged view of the structure within the dashed rectangle.

[0040] Figure 14 yes Figure 13 Enlarged view of the structure inside the dashed circle. Detailed Implementation

[0041] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] To ensure accuracy throughout the text, all references to direction should be in the format of "direction". Figure 1 For reference, the sliding direction of the bending slider 8 is represented by the X-axis, the opening or closing direction of the upper die 100 and the lower die 200 is represented by the Y-axis (where the positive Y-axis is the opening direction, or in other words, the positive Y-axis is upward), and the feeding direction of the product strip 35 is represented by the Z-axis. The X-axis, Y-axis, and Z-axis are perpendicular to each other.

[0043] Please refer to Figures 1 to 14 The diagram shows a cantilever bending stripping mechanism for a continuous stamping die system disclosed in this application. It includes a cantilever bridge 7, which serves as a mounting carrier for two bending sliders 8 and a wedge block 10. The ends of the two bending sliders 8 that are far apart along the X-axis form a bending die cantilever structure 81, while the ends of the two bending sliders 8 that are adjacent along the X-axis form an inclined mating surface 82. The cantilever bridge 7 includes an integral bearing section 701 and a fixing section 702. The two bending sliders 8 are mounted on the bearing section 701 of the cantilever bridge 7 and located within a sliding track 71 extending along the X-axis formed on the cantilever bridge 7. The bending sliders 8 and the cantilever bridge 7 are slidably fitted through dovetail grooves. Semi-circular spring grooves (unlabeled) are machined at corresponding positions where the two bending sliders 8 mate with the sliding track 71 of the cantilever bridge 7, and a retraction spring 9 is placed within them. The retraction spring 9 is set to a preloaded state. Under the action of the retraction spring 9, the two bent sliders 8 will continuously be pushed towards the central axis of the cantilever bridge 7. Therefore, the rear inclined surfaces of the two bent sliders 8 can always contact the inclined surface of the lower section of the wedge 10. The wedge 10 is inserted into the groove 72 on the bearing section 701 of the cantilever bridge 7 along the Y-axis. The inner wall of the groove 72 is also machined with a semi-circular spring groove (unlabeled) at the position corresponding to the side wall of the wedge 10, and a lifting spring 11 is placed inside. The lifting spring 11 is set to a preloaded state, which can continuously provide the wedge 10 with an upward (positive Y-axis) lifting force. This lifting force can ensure that the wedge 10 floats upward along the groove 72 in the cantilever bridge 7 without being subjected to downward pressure. However, the floating height of the wedge 10 is limited by the two wedge limiting pins 12. The two wedge-shaped limiting pins 12 are installed along the Z-axis within the load-bearing section 701 of the cantilever bridge 7. For details, please refer to... Figure 3 Two wedge limit pins 12 are correspondingly inserted and fixed into the barrel grooves 7011 formed on the bearing section 701. At their height positions, the two wedge limit pins 12 can just pass through the limit grooves (not labeled) on the two sides of the wedge 10 before the floating spring 11 is installed. The cooperation between the two wedge limit pins 12 and the limit grooves ensures that the wedge 10 can only reciprocate within a preset area along the Y-axis direction. Preferably, in this embodiment, the wedge 10 is limited to floating only to a position protruding upwards to 0.7mm above the upper surface of the cantilever bridge 7.

[0044] Please refer to Figures 1 to 7As shown, the fixed section 702 of the cantilever bridge 7 is tightly fitted into the U-shaped groove 151 on the back of the crossbeam 15. The specific installation position of the cantilever bridge 7 within the U-shaped groove 151 is precisely controlled and fixed by two positioning pins 13, and then locked in place by locking screws 14. The two ends of the crossbeam 15 are respectively placed on the tops of the two piers 16. Positioning slots 152 are machined at appropriate positions at both ends of the crossbeam 15, while limiting bosses 161 are designed at the tops of the two piers 16. Both the positioning slots 152 and the limiting bosses 161 are precision machined, so with their tight fit, the relative position of the crossbeam 15 and the piers 16 can be accurately achieved, and then they are respectively fastened together by two fixing screws 17. At this point, the cantilever bridge 7, the crossbeam 15, and the two piers 16 are precisely connected together to form a cantilevered assembly (unlabeled). The two pier sections 16 of the cantilever forming assembly are slidably installed in the two frame openings 51 of the lower template 5. The two frame openings 51 are respectively located on both sides of the product strip area (unlabeled, which is actually the area of ​​the lower template 5 used to support the product strip 35) (or can be described as the two frame openings 51 being located at both ends of the product strip area along the X-axis direction). For details, please refer to section 3. Figure 4 As shown. A pusher 18 passes through a hole in the lower pad 6 and pushes upward against the lower surface of the two pier portions 16. The bottom surface of the pusher 18 is supported by a spring (not shown). The function of the pusher 18 is to provide an upward buoyancy force to the entire cantilevered assembly.

[0045] please Figure 2 and combined Figure 6 As shown, the cantilever bridge 7, which supports the two bent sliders 8 and wedges 10, can span across the product strip 35, relying on the crossbeam 15 and the pier 16. The product strip 35 is supported by the floating pin 33, which is held in a floating state by a spring (not shown). The entire cantilever forming assembly is also supported by the pusher 18 and is in a floating state, except that the lower surface of the cantilever bridge 7 is slightly higher than the upper surface of the product strip 35 to ensure that the product strip 35 has sufficient room to move during feeding (Z-axis movement, also known as feeding).

[0046] The descent force on the cantilever forming assembly is applied by the cantilever bridge pressure block 24 above the cantilever bridge 7 and the crossbeam pressure block 25 above the crossbeam. The cantilever bridge pressure block 24 is also inlaid with two contoured support members 26. The lower end face of the contoured support member 26 matches the upper surface of the bending die cantilever structure 81 and can correspondingly press against the upper surface of the bending die cantilever structure 81. The contoured support member 26 is provided to provide auxiliary support to the weak bending slider 8 from the gaps in the pre-bending spring blank 351 during the reverse bending of the product strip 35.

[0047] The cantilever bridge pressure block 24 and the crossbeam pressure block 25 are both tightly fitted into the frame opening 41 of the stripper plate 4, and are hung upside down in the hanging groove 411 on one side of the frame opening 41 by a hanging platform (unlabeled) to prevent them from falling downwards. In addition, the stripper plate 4 is also equipped with a positioning pin 27 and a stripping pin 28, and the mounting hole 271 of the positioning pin 27 ( Figure 11 (As shown) Through precision machining, it can provide accurate positioning for the product strip 35. The function of the stripper pin 28 is to help the positioning pin 27 inserted in the positioning hole 350 on the product strip 35 to disengage when the mold opens, with the help of the stripper spring 29 installed above it. (Specifically, when the mold opens, the positioning pin 27 moves upward with the stripper plate 3 and the stripper plate 4, while the stripper pin 28 maintains downward pressure on the product strip 35 with the help of the downward pressure of the stripper spring 29, so that the product strip 35 does not move upward with the positioning pin 27). The upper surfaces of the cantilever bridge pressure block 24, the crossbeam pressure block 25, and the positioning pin 27 all press against the lower surface of the stripper plate 3. The stripper plate 3 and the stripper plate 4 are locked together with screws.

[0048] Please refer to Figure 7 , Figure 9 and Figure 10 As shown, two pressure blocks 22 are arranged below the two bending sliders 8, separated by the product strip 35. The two pressure blocks 22 are tightly fitted inside the two frame openings 52 of the lower template 5. The function of the two pressure blocks 22 is to cooperate with the descending bending sliders 8 to press the product strip 35 along the Z-axis direction. In the X-axis direction, the lower template 5 also forms two second frame openings 53 outside the frame openings 52. The spring sheet bending side push slider 19 is slidably installed in the second frame openings 53. The spring sheet bending side push slider 19 can reciprocate along the X-axis within a preset range. The upper end of the spring sheet bending side push slider 19 extends along the X-axis to form a stamping bending head 191. Figure 10 As shown, the stamping and bending head 191, in conjunction with two bending sliders 8, performs stamping and bending on the pre-bent spring blank 351 on the product strip 35.

[0049] Specifically, each spring bending side pusher 19 has a spring blind hole (not shown) on its side near the first frame opening 52 along the X-axis, and a return spring (not shown) is placed in the spring blind hole. One end of the return spring abuts against the inner wall of the second frame opening 53, and is responsible for providing the return force to the spring bending side pusher 19 after the reverse bending of the spring is completed, so that the spring bending side pusher 19 is continuously subjected to a pushing force along the X-axis away from the first frame opening 52. Therefore, in the mold-open state, the return spring always pushes the two spring bending side pushers 19. The side of the spring bending side pusher 19 away from the first frame opening 52 abuts against two insert blocks 23 that are also installed in the second frame opening 53. The insert blocks 23 are inserted into the second frame opening 53 and fit tightly with the second frame opening 53. Below the two spring-loaded bending side-pushing sliders 19, there are slider pads 21, and above the spring-loaded bending side-pushing sliders 19, there is a slider pressure plate 34 locked to the upper surface of the lower template 5 (see reference). Figure 6 Combination Figure 7 This is to prevent the side-push slider 19 from tilting or jumping out during the sliding process due to the bending of the spring sheet. The bottom surfaces of the insert block 23 and the slider pad block 21 are both pressed against the upper surface of the lower pad plate 6, and the lower pad plate 6 is locked together with the lower template 5.

[0050] The two spring sheet bending side push sliders 19 form a mating inclined surface 191 on the side away from the first frame opening 52 (or, the two spring sheet bending side push sliders 19 form a mating inclined surface 191 at their opposite outer ends along the X-axis), corresponding to the two insert blades 30. The two insert blades 30 are responsible for applying force to the spring sheet bending side push sliders 19 towards the pre-bent spring sheet blank 351 after the product strip 35 is positioned and pressed. Both insert blades 30 pass through the stripper plate 4 and the stripper back plate 3 and are slidably installed in the mounting frame opening 21 of the upper clamping plate 2. The insert blades 30 have pressure plate grooves (unlabeled), and the insert blade pressure plate 31 extends into these grooves. The fastening screws 32 lock the insert blade pressure plate 31 onto the upper clamping plate 2. Inside the upper clamping plate 2, along the X-axis direction, between the two mounting frame openings 21, two clamping plate limiting posts 36 are also installed. When the mold is closed, the lower end face of the clamping plate limiting post 36 abuts against the upper surface of the ejector plate 3, restricting the ejection return stroke. The upper end faces of the inserter 30 and the clamping plate limiting post 36 abut against the lower surface of the upper pad plate 1, and the upper pad plate 1 and the upper clamping plate 2 are locked together by screws.

[0051] The operating principle of this application is explained in detail below:

[0052] In the open mold state, the punch press slide begins to descend from the top dead center position, driving the upper mold 100 to descend synchronously. The stripper plate 4, in the stripping state, along with the cantilever bridge pressure block 24, the crossbeam pressure block 25, and the positioning pin 27, presses down on the lower mold 200. As the upper mold 100 presses down, the first parts that the upper mold 100 and the lower mold 200 contact are the cantilever bridge pressure block 24 and the wedge block 10, which floats relative to the cantilever bridge 7. When the lower surface of the cantilever bridge pressure block 24 touches the upper surface of the wedge block 10, the wedge block 10 begins to be pressed downward. The descent of the wedge block 10 then pushes the two bending slides 8 to extend forward in a direction away from the central axis of the cantilever bridge 7 (X-axis direction). When wedge 10 is pressed down until its upper surface is flush with the upper surface of cantilever bridge 7, the two bending sliders 8 are also pushed to their working positions. At the same time, the lower surface of cantilever bridge pressure block 24 contacts the upper surface of cantilever bridge 7, and the lower surface of crossbeam pressure block 25 also touches the upper surface of crossbeam 15. Positioning pin 27 is simultaneously inserted into the positioning hole of the product strip 35 that has been fed into position. Next, these stripping parts press down on the cantilever forming assembly to continue to descend. Under the pressure of the lower surfaces of cantilever bridge 7 and stripping plate 4, product strip 35 begins to approach the lower mold surface (that is, the upper surface of lower mold plate 5) until the lower surface of product strip 35 is pressed against the upper surface of lower mold plate 5.

[0053] As the upper die 100 continues to descend, the stripper plate 4, along with the parts mounted on it and the stripper back plate 3, is prevented from descending further. However, they continue to press firmly against the precisely positioned product strip 35, ensuring that the pre-folded spring blank 351 will not shift during bending. Then, the upper clamping plate 2, carrying the insert knife 30, continues to descend. When the inclined surface at the lower end of the insert knife 30 contacts the mating inclined surface 191 at the rear end of the spring bending side push slider 19, the insert knife 30 begins to apply a pushing force to the spring bending side push slider 19. Next, the spring bending side push slider 19, pushed by the continuously descending insert knife 30, begins to slide horizontally (in the X-axis direction) and quickly rushes towards the pre-folded spring blank 351, cooperating with the bending slider 8 already waiting in the working position to perform the bending action on the pre-folded spring blank 351. Once the punch press slide reaches the bottom dead center, the lower end of the clamping plate limit post 36 stops after hitting the upper surface of the back plate 3. The insert cutter 30 also pushes the spring sheet bending side pusher slide 19 to its stroke limit. At this time, the pre-folded spring sheet blank 351 also changes from a blank to a reverse-folded spring sheet. A stamping and bending forming action is completed, forming the mold closing state.

[0054] After the aforementioned stamping and bending forming action is completed, the press slide moves away from the bottom dead center and begins its upward return stroke. The upward movement of the press slide drives the upper die 100 to rise, and first, the upper clamping plate 2 moves rapidly upward with the insert 30. As the insert 30 is lifted upward, the spring-loaded bending side pusher 19, which is in contact with the inclined surface at the lower end of the insert 30, is pushed back by the return spring. After the inclined surface at the lower end of the insert 30 is completely separated from the inclined surface of the spring-loaded bending side pusher 19, the rear end of the spring-loaded bending side pusher 19 then hits the insert stop block 23 and returns to its original position. After the upper clamping plate 2 moves upward for one stripping stroke, the stripper plate 4 begins to pull upward with the parts mounted on it. Then, the cantilever forming assembly, which is pressed by the cantilever bridge pressure block 24 and the crossbeam pressure block 25, and the formed product strip 35, begin to float simultaneously under the support of the pusher 18 and the floating pin 33. The product strip 35 stops floating after reaching its maximum lifting height, and the cantilever forming assembly stops floating after a short distance of strip movement. As the upper mold 100 continues to rise, the lower surfaces of the cantilever bridge pressure block 24 and the crossbeam pressure block 25 detach from the upper surfaces of the cantilever bridge 7 and the crossbeam 15, respectively. However, the wedge 10, which first contacts the upper mold 100, continues to float upward under the elastic force of the lifting spring 11, following the cantilever bridge pressure block 24 that is pressing it. Subsequently, its upper surface gradually rises above the upper surface of the cantilever bridge 7. As the wedge 10 floats upward, it also receives the action response of the two bent sliders 8 that are pressed against by the lower inclined surface of the wedge 10. Under the action of the retraction spring 9, the two bent sliders 8 quickly retract and retract towards the central axis of the cantilever bridge 7. When the wedge 10 floats up to the point where its upper surface is 0.7mm above the upper surface of the cantilever bridge 7... The lower side of the limiting groove on the side of the wedge 10 will touch the lower surface of the wedge limiting pin 12, thus preventing the wedge 10 from continuing to float upward. The cessation of the upward movement of the wedge 10 also forces the two bending sliders 8 to stop retracting. However, although the two bending sliders 8 cannot continue to retract, the distance they have retracted has created a relatively large gap 300 between the bending die cantilever structure 81 at one end of the two bending sliders 8 and the pre-bent spring blank 351 that has just completed bending (see reference). Figure 14 and combined Figure 13 and Figure 2(As shown). This gap 300 is used to accommodate the tilting that the pre-folded spring blank 351 may produce during the feeding movement of the product strip 35. It is precisely because of this safety gap 300 between the two bending sliders 8 and the pre-folded spring blank 351 that the subsequent feeding movement of the product strip 35 can be guaranteed to proceed smoothly. This completely eliminates the safety hazard caused by the pre-folded spring blank 351 locking onto the bending die cantilever structure 81 during bending. Even if the pre-folded spring blank 351 tilts slightly, it will never lock onto the bending die cantilever structure 81. After the safety gap 300 is formed, the upper die 100 continues to rise with the press slide until the press slide returns to the top dead center, completing one stamping return stroke and forming the open die state.

[0055] In this design, the symmetrical reverse-folding spring sheet structures (the structure after bending the pre-folded spring sheet blank 351) on the product strip 35 have an upward bending direction. Therefore, the bending die cantilever structure 81 needs to be positioned above the product strip 35. The bending die cantilever structure 81 above the product strip 35 relies on the crossbeam 15 to span the entire product strip 35. To facilitate the feeding and movement of the product strip 35, the piers 16 of the crossbeam 15 must be positioned on both sides of the product strip 35 and installed within the lower template 5. Because the pre-folded spring sheet blank 351 needs to be folded at a large angle, the cantilever thickness of the bending die cantilever structure 81 also needs to be very thin to provide sufficient clearance. Since the bending die cantilever structure 81 is very thin, its strength is inevitably poor. Therefore, this bending action in this application adopts a side-push forming method. A spring sheet bending side-push slider 19 is set opposite the bending die cantilever structure 81 in the form of a side-push slider. During the forming process, the spring sheet bending side pusher 19 is pushed by the insert 30 installed in the upper clamping plate 2, and applies bending force to the pre-bent spring sheet blank 351. After forming, the spring sheet bending side pusher 19 is pushed back to its original position by the return spring to avoid blocking the feeding of the product strip 35. This bending method can ensure the rigidity of the bending die cantilever structure 81 during the bending forming process, greatly improving its service life, and also facilitating the force balance of the corresponding positions of the pre-bent spring sheet blank 351 and the product strip 35 during large-angle bending. It is precisely because of the setting of the spring sheet bending side pusher 19 that the pier 16 of the crossbeam 15 must be set on the post-bending station of the bending station, which also makes the structure of the entire mold system more complex. In order to take into account the function of the mechanism, service life, processing technology, assembly accuracy and manufacturing cost, the mold system is mainly designed and decomposed into the form of the implementation scheme of this application.

[0056] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cantilever bending and stripping mechanism for a continuous stamping die system, characterized in that, include: The upper and lower dies cooperate with each other and are defined with mutually perpendicular X-axis, Y-axis and Z-axis directions, wherein the positive Y-axis is the opening direction of the upper die relative to the lower die, and the positive Z-axis is the feeding direction of the product strip; The cantilever forming assembly is movably connected to the lower mold and can reciprocate relative to the lower mold along the Y-axis. A spatial area for inserting product strip is formed between the cantilever forming assembly and the upper surface of the lower mold. At least one bending slider is movably coupled to the cantilever forming assembly and can reciprocate relative to the cantilever forming assembly along the X-axis direction. One end of the bending slider extends along the X-axis direction to form a bending die cantilever structure. At least one wedge is movably coupled to the cantilever forming assembly and is capable of reciprocating relative to the cantilever forming assembly along the Y-axis direction. The wedge and the bending slider are engaged by an inclined surface. At least one spring sheet bending side push slider is movably connected to the lower die and can reciprocate relative to the lower die along the X-axis direction. The spring sheet bending side push slider and the bending die cantilever structure are arranged opposite to each other along the X-axis direction and form a space between them for accommodating the pre-bent spring sheet blank. Cantilever bridge pressure block, combined with the upper mold; Insert blade, which is attached to the upper mold; When the upper and lower dies are closed, the cantilever bridge pressure block drives the wedge block to move along the negative Y-axis, and the insert drive spring sheet bending side push slider moves towards the bending die cantilever structure along the Y-axis. in When the wedge moves along the negative Y-axis, it can drive the bending slider to move along the X-axis; when the wedge moves along the positive Y-axis, the bending slider resets along the X-axis.

2. The cantilever bending and stripping mechanism of the continuous stamping die system according to claim 1, characterized in that: It also includes several floating pins, which are movably connected to the lower mold and located directly below the product strip. The floating pins can reciprocate relative to the lower mold along the Y-axis. One end of the floating pin abuts against the lower surface of the product strip. The floating pins can move the product strip together with the cantilever forming assembly relative to the lower mold along the positive Y-axis by a certain distance, so that the product strip together with the cantilever forming assembly is separated from the upper surface of the lower mold.

3. The cantilever bending and stripping mechanism of the continuous stamping die system according to claim 1, characterized in that: The cantilever forming assembly has a sliding groove running through it along the Y-axis. The wedge is slidably fitted into the sliding groove. A spring groove is formed at the position corresponding to the side wall of the wedge on the inner wall of the sliding groove. A floating spring is embedded in the spring groove. The floating spring is set to a pre-compression state, which can continuously provide the wedge with a floating force in the positive Y-axis direction. When the upper mold and the lower mold open, the end of the wedge along the positive Y-axis floats up and extends beyond the upper surface of the cantilever forming assembly.

4. The cantilever bending and stripping mechanism of the continuous stamping die system according to claim 3, characterized in that: The cantilever forming assembly includes a longitudinally elongated crossbeam along the X-axis, two piers respectively disposed below the two ends of the crossbeam along the X-axis, and a cantilever bridge at least partially fixed below the crossbeam along the Y-axis. The two piers are inserted into the recessed frame formed on the upper surface of the lower mold along the negative Y-axis. The cantilever forming assembly spans across the product strip.

5. The cantilever bending and stripping mechanism of the continuous stamping die system according to claim 4, characterized in that: The cantilever bridge includes an integrally formed load-bearing section and a fixed section. The bending slider is movably connected to the load-bearing section and slides with the load-bearing section through a dovetail groove. The crossbeam is fixedly connected to the fixed section, and the groove is formed on the load-bearing section.

6. The cantilever bending and stripping mechanism of the continuous stamping die system according to claim 4, characterized in that: It also includes a pier pressure plate, which is locked to the upper surface of the lower template by screws. Each pier has a shoulder recessed at the position of the pier pressure plate, and the pier pressure plate is pressed and limited above the shoulder to limit the upward excessive displacement of the pier.

7. The cantilever bending and stripping mechanism of the continuous stamping die system according to claim 1, characterized in that: The upper die also includes a contour support extending along the negative Y-axis. The lower end face of the contour support matches the upper surface of the bending die cantilever structure. When the upper die and the lower die are closed, the lower end face of the contour support can press against the upper surface of the bending die cantilever structure.

8. The cantilever bending and stripping mechanism of the continuous stamping die system according to claim 1, characterized in that: The bending slider is provided in two parts. The end faces of the two bending sliders opposite each other along the X-axis form inclined surfaces that cooperate with the wedge. The wedge is located directly above the two inclined surfaces and has a corresponding mating inclined surface that cooperates with the inclined surfaces.

9. The cantilever bending and stripping mechanism of the continuous stamping die system according to claim 8, characterized in that: It also includes a retraction spring. Spring grooves are recessed on the contact surfaces of the two bending sliders and the cantilever forming assembly. The retraction spring is placed in the spring groove and is set to a pre-compression state. Under the action of the retraction spring, the two bending sliders will continuously be subjected to the thrust from the retraction spring to bring them closer to each other. The inclined surfaces at the ends of the two bending sliders are always in contact with the mating inclined surfaces of the lower section of the wedge.

10. The cantilever bending and stripping mechanism of the continuous stamping die system according to claim 5, characterized in that: The load-bearing section and the spring sheet bending side push slider are both located behind the crossbeam along the positive Z-axis.

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