Sheet metal bending lower die and bending machine

Abstract

The utility model provides a metal plate bending lower mould and bending machine in the technical field of metal plate bending, including base, first bending block, second bending block, third bending block and two side plates, the base is U shape, one side of the bottom in the base is equipped with the inclined plane, first bending block bottom one side is equipped with the inclined plane, and first bending block removes along the inclined plane of base bottom's inclined plane, second bending block is located in the middle part of first bending block, and third bending block is located in the top of second bending block, and the side plate is fixed in the both sides of base, and both ends of first bending block, second bending block and third bending block are opposite to slide with the side plate, and the side plate still is equipped with first reset device, second reset device and third reset device of supporting first bending block, second bending block and third bending block and can make its reset, and when the edge is bent through the bending of base, first bending block, second bending block and third bending block, make the edge can be formed one time, and the production efficiency is high, and will not occur interference with the upper die.

Description

Technical Field

[0001] This utility model relates to the technical field of sheet metal bending, specifically a sheet metal bending die and bending machine. Background Technology

[0002] Bending is a plastic forming process in which metal sheets are placed on a bending machine and the pressure between the upper and lower dies is used to obtain workpieces with a certain angle or arc.

[0003] Many sheet metal parts require two consecutive right-angle bends at their edges, known as folding or hemming. Folding increases the rigidity of sheet metal edges, smoothly transitions burrs or sharp angles from the original cut edges to prevent scratches, can form hollow tube structures for inserting other components or fixing cables, facilitates the use of hemming as a positioning or snap-fit ​​mechanism, reduces edge exposure, lowers the probability of rust, and makes product edges more aesthetically pleasing, especially suitable for exposed sheet metal parts.

[0004] However, the sheet metal edge-wrapping process requires at least two bending steps, as per the instruction manual. Figure 1 As shown, production efficiency is low, and the double bending increases the chance of scratches on the sheet metal surface, resulting in low product quality.

[0005] Chinese Patent Publication No. CN222326326U discloses a bending device for sheet metal, including a base, a fixed seat, an upper die, a lower die, and a spring. The fixed seat is mounted on the base and has a rectangular groove, a mounting through hole, and a positioning pin. The lower die is positioned within the rectangular groove, and the spring passes through the mounting through hole of the fixed seat. The top and bottom ends of the spring are connected to the lower die and the base, respectively. The upper die is connected to a hydraulic drive mechanism. In this bending device, the sheet metal is placed on the lower die, and the side of the sheet metal contacts and abuts against the limiting pin. The hydraulic drive mechanism drives the upper die to descend, pressing down on the sheet metal and the lower die, causing the lower die to move downward along the rectangular groove of the fixed seat, completing a 90° bend in the sheet metal. After the upper die rises, the lower die returns to its original position under the action of the spring. This device facilitates and speeds up sheet metal bending, improving production efficiency. However, this bending device can only complete one bend per lower die press, resulting in low bending efficiency. Furthermore, the sheet metal is prone to interference or collision with the upper die during the second bend. Summary of the Invention

[0006] The technical problem to be solved by this utility model is how to improve the efficiency of sheet metal bending and how to avoid interference between the sheet metal and the upper die. The purpose of this utility model is to provide a sheet metal bending lower die and bending machine that can enable the lower die to complete two bending processes in one pressing process by displacing multiple bending blocks in the lower die.

[0007] The technical solution adopted by this utility model is: a sheet metal bending lower die, including a base, a first bending block, a second bending block, a third bending block, and two side plates. The base is U-shaped, with an inclined surface on one side of the bottom of the base. The first bending block has an inclined surface on one side of its bottom, and the first bending block moves along the inclined surface at the bottom of the base via the inclined surface. The second bending block is located in the middle of the first bending block, and the third bending block is located at the top of the second bending block. The side plates are fixed to both sides of the base, and the ends of the first bending block, the second bending block, and the third bending block slide relative to the side plates. The side plates are also provided with a first reset device, a second reset device, and a third reset device that support the first bending block, the second bending block, and the third bending block and enable them to reset.

[0008] The sheet metal bending die and bending machine provided by this utility model can achieve the following beneficial effects: (1) By setting the base, the first bending block, the second bending block and the third bending block for bending, and using the side plate and the first reset device, the second reset device and the third reset device on the side plate for support and reset, the sheet metal edge can be formed in one go, which greatly shortens the time required for the sheet metal bending edge process, improves production efficiency, and at the same time reduces the probability of scratches caused by multiple bends, thus improving the quality of the product.

[0009] (2) The unbent part before, during and after bending does not need to be flipped. Only the bent end is flipped, which avoids interference or collision between the sheet metal and the upper mold during the bending process and improves the accuracy of sheet metal bending.

[0010] Preferably, the first bending block is U-shaped and both its top and bottom ends are horizontal straight plates; the second bending block is Z-shaped and includes two vertical ends, which are located at the bottom left and top right of the horizontal end, respectively. The vertical end of the second bending block located at the bottom of the horizontal end is far away from the inclined surface of the first bending block, and the horizontal end of the second bending block is always above the horizontal straight plate at the bottom of the first bending block; the third bending block is rectangular, and the bottom of the third bending block is always above the horizontal end of the second bending block. When the first bending block rises to its highest point, the side of the third bending block closest to the first bending block fits against the edge of the horizontal straight plate at the top of the first bending block.

[0011] The second bending block is always positioned above the bottom horizontal plate of the first bending block, and the bottom of the third bending block is always positioned above the horizontal end of the second bending block. This creates a linkage between the first, second, and third bending blocks. When the third bending block moves downward a certain distance, it pushes the second bending block, completing the first bend. When the second bending block moves downward a certain distance, it pushes the third bending block, causing the third bending block to move along the slope and approach the first bending block during its downward movement, completing the second bend.

[0012] Preferably, the bottom of the base has a plurality of first limiting strips evenly spaced along the inclined surface; the bottom of the first bending block has a first limiting groove adapted to the first limiting strips below the inclined surface; the inner bottom of the base has a second limiting strip on the side away from the inclined surface, and the side wall of the second bending block near the vertical end of the second limiting strip has a second limiting groove; the third bending block has a third limiting groove on the side wall away from the first bending block, the third limiting groove is aligned with the second limiting groove and both are adapted to the second limiting strips on the inner bottom of the base.

[0013] The first limiting strip restricts the displacement freedom of the first bent block. When the first bent block on the first bent block is matched with the first limiting groove on the base, the first bent block can only slide along the inclined plane. The second limiting strip restricts the displacement freedom of the second and third bent blocks. When the second limiting groove on the second bent block and the third limiting groove on the third bent block are matched with the second limiting strip, the second and third bent blocks can only slide up and down vertically via the second limiting strip.

[0014] Preferably, the second bending block has a third limiting strip on the inner side of the vertical end on the right side of the horizontal end, and the third bending block has a third limiting groove and a fourth limiting groove on its left and right sides, respectively. The third limiting groove communicates with the second limiting groove on the second bending block, and the fourth limiting groove is adapted to the third limiting strip on the second bending block.

[0015] The displacement freedom of the third bending block is restricted by the third limiting strip on the second bending block and the second limiting strip on the base. When the fourth limiting groove on the third bending block is adapted to the third limiting strip on the second bending block and the third limiting groove is adapted to the second limiting strip on the base, the third bending block can only slide up and down in the vertical direction.

[0016] Preferably, the side plate is further provided with a fifth limiting groove and a fourth limiting strip to restrict the movement direction of the first bending block, the second bending block and the third bending block; both ends of the first bending block are provided with inclined first end face limiting grooves, and the first end face limiting grooves at both ends of the first bending block are adapted to the fourth limiting strip on the side plate; both ends of the second bending block are provided with first end face limiting strips, and both ends of the third bending block are provided with second end face limiting strips, the first end face limiting strips at both ends of the second bending block and the second end face limiting strips at both ends of the third bending block overlap each other and are adapted to the fifth limiting groove on the side plate.

[0017] The second and third bending blocks are limited from the ends by the fifth limiting groove, so that the second and third bending blocks can only slide vertically up and down, preventing them from deviating during the sliding process; the first bending block is limited from the end by the fourth limiting strip, so that the first bending block can only slide along the inclined first end face limiting groove, preventing it from deviating during the sliding process.

[0018] Preferably, the side plate is provided with a first reset device, a second reset device, and a third reset device for supporting the first bending block, the second bending block, and the third bending block and for resetting the first bending block, the second bending block, and the third bending block.

[0019] The first, second, and third bending blocks are supported by the first, second, and third reset devices respectively, so that the order in which the first, second, and third bending blocks move remains unchanged. The third bending block only starts to move after being pushed by the second bending block, preventing the first bending block from moving with the third bending block and ensuring that the bending process is carried out in the set order.

[0020] Preferably, each of the side plates is provided with a first through groove, a second through groove, and a third through groove. Both ends of the first, second, and third bending blocks are provided with protrusions. The protrusion on the first bending block passes through the first through groove on the side plate and is fixedly connected to one end of the first reset device, while the other end of the first reset device is fixedly connected to the side plate. The protrusion on the second bending block passes through the second through groove on the side plate and is fixedly connected to one end of the second reset device, while the other end of the second reset device is fixedly connected to the side plate. The protrusion on the third bending block passes through the third through groove on the side plate and is fixedly connected to one end of the third reset device, while the other end of the third reset device is fixedly connected to the side plate. The supporting force of the first reset device is greater than that of the third reset device.

[0021] The first through slot, the second through slot, and the third through slot facilitate the movement of the protrusions on the first bending block, the second bending block, and the third bending block. At the same time, the protrusions on the first bending block, the second bending block, and the third bending block are used to connect the first reset device, the second reset device, and the third reset device to the side plate, respectively.

[0022] Preferably, a limiting plate is provided at the top of the horizontal straight plate at the top of the first bending block; multiple rotating shafts are rotatably connected to the upper and lower sides of the end of the horizontal straight plate, and the rotating shafts are detachably and fixedly connected to the first bending block through pressure plates for limiting.

[0023] When the first bending block initially moves, the position of the third bending block remains unchanged. The pivot on the upper side of the first bending block facilitates the first bend. When the second bending block begins to push the first bending block, the first bending block begins to slide along the inclined plane and move closer to the third bending block. The pivot on the lower side of the first bending block facilitates the second bend. At the same time, the pivot prevents the first bending block from rubbing against the metal surface and causing scratches. By setting multiple pivots, the bending stiffness of the pivot can be increased by reducing the length of the pivot, thereby reducing the probability of pivot damage. The pressure plate facilitates the fixing of the pivot, thus facilitating the installation and removal of the pivot.

[0024] As a preferred embodiment, this application also discloses a bending machine, including the above-mentioned sheet metal bending upper die.

[0025] Preferably, the upper mold is L-shaped.

[0026] The L-shaped upper die facilitates support for the second bend. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the existing sheet metal bending process with metal edging; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is a cross-sectional view of the three-dimensional mechanism of this utility model; Figure 4 This is an exploded view of the present invention; Figure 5 This is a schematic diagram of the workflow of this utility model; Figure 6 This is a three-dimensional structural diagram of the first bending block in this utility model.

[0029] Reference numerals: 1-Upper mold, 2-Lower mold, 21-Base, 211-First limiting strip, 212-Second limiting strip, 22-First bending block, 221-First limiting groove, 222-First end face limiting groove, 223-Limiting plate, 224-Rotating shaft, 225-Pressure plate, 23-Second bending block, 231-Second limiting groove, 232-Third limiting strip, 233-First end face limiting strip, 24-Third bending block, 241-Third limiting groove, 242-Fourth limiting groove, 243-Second end face limiting strip, 25-Side plate, 251-Fifth limiting groove, 252-Fourth limiting strip, 253-First through groove, 254-Second through groove, 255-Third through groove, 26-First reset device, 27-Second reset device, 28-Third reset device. Detailed Implementation

[0030] The following will be combined with the appendix Figure 2-5 The technical solution of this utility model is clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Example 1 The following description, in conjunction with specific embodiments, provides further details. Figure 2-5As shown, this embodiment is a sheet metal bending lower die 2, including a base 21, a first bending block 22, a second bending block 23, a third bending block 24, and two side plates 25. The base 21 is U-shaped, with an inclined surface on one side of the bottom of the base 21. The first bending block 22 also has an inclined surface on one side of its bottom, allowing it to move along the inclined surface at the bottom of the base 21. The second bending block 23 is located in the middle of the first bending block 22, and the third bending block 24 is located at the top of the second bending block 23. The side plates 25 are fixed to both sides of the base 21, and the ends of the first bending block 22, the second bending block 23, and the third bending block 24 slide relative to the side plates 25. The side plates 25 also have supports for the first bending block 22. The sheet metal bending die 2 provided by this utility model includes a bending block 22, a second bending block 23, and a third bending block 24, and a first reset device 26, a second reset device 27, and a third reset device 28 that can reset them. By setting a base 21, the first bending block 22, the second bending block 23, and the third bending block 24 to bend when the upper die presses down, and using the side plate 25 and the first reset device 26, the second reset device 27, and the third reset device 28 on the side plate 25 for support and reset, the sheet metal edge can be formed in one go, which greatly shortens the time required for the sheet metal bending edge process, improves production efficiency, reduces the probability of scratches caused by multiple bends, and improves product quality.

[0033] Reference Figure 3 or Figure 4 or Figure 6 As shown, in this embodiment, the first bending block 22 is U-shaped, and both its top and bottom ends are horizontal straight plates; the second bending block 23 is Z-shaped and includes two vertical ends, which are located at the bottom left and top right of the horizontal end, respectively. The vertical end of the second bending block 23 located at the bottom of the horizontal end is away from the inclined surface of the first bending block 22, and the horizontal end of the second bending block 23 is always above the horizontal straight plate at the bottom of the first bending block 22; the third bending block 24 is rectangular, and the bottom of the third bending block 24 is always above the horizontal end of the second bending block 23. When the first bending block 22 rises to its highest point, the third bending block 24 approaches the first bending block 23. One side of the second bending block 23 is in contact with the edge of the horizontal straight plate at the top of the first bending block 22. The horizontal end of the second bending block 23 is always above the horizontal straight plate at the bottom of the first bending block 22, and the bottom of the third bending block 24 is always above the horizontal end of the second bending block 23. This makes the first bending block 22, the second bending block 23 and the third bending block 24 work together. When the third bending block 24 moves down a certain distance, it will push the second bending block 23 and complete the first bend. When the second bending block 23 moves down a certain distance, it will push the third bending block 24, so that the third bending block 24 moves along the slope and gets closer to the first bending block 22 during the downward movement, completing the second bend.

[0034] Reference Figure 3-4 As shown, in this embodiment, the bottom of the base 21 has a plurality of first limiting strips 211 evenly spaced along the inclined surface; the bottom of the first bent block 22 has a first limiting groove 221 adapted to the first limiting strips 211 below the inclined surface; the inner bottom of the base 21 has a second limiting strip 212 on the side away from the inclined surface, and the side wall of the second bent block 23 near the vertical end of the second limiting strip 212 has a second limiting groove 231; the side wall of the third bent block 24 away from the first bent block 22 has a third limiting groove 241, the third limiting groove 241 is aligned with the second limiting groove 231 and both are aligned with the inner bottom of the base 21. The second limiting strip 212 is adapted to the first limiting strip 211 to restrict the displacement degree of freedom of the first bending block 22. When the first bending block 22 on the first bending block 22 is adapted to the first limiting groove 221 on the base 21, the first bending block 22 can only slide along the inclined plane. The second limiting strip 212 restricts the displacement degree of freedom of the second bending block 23 and the third bending block 24. When the second limiting groove 231 on the second bending block 23 and the third limiting groove 241 on the third bending block 24 are adapted to the second limiting strip 212, the second bending block 23 and the third bending block 24 can only slide up and down in the vertical direction along the second limiting strip 212.

[0035] Reference Figure 2-4 As shown, in this embodiment, the second bending block 23 has a third limiting strip 232 on the inner side of the vertical end on the right side of the horizontal end. The third bending block 24 has a third limiting groove 241 and a fourth limiting groove 242 on its left and right sides, respectively. The third limiting groove 241 communicates with the second limiting groove 231 on the second bending block 23. The fourth limiting groove 242 is adapted to the third limiting strip 232 on the second bending block 23. The displacement freedom of the third bending block 24 is restricted by the third limiting strip 232 on the second bending block 23 and the second limiting strip 212 on the base 21. When the fourth limiting groove 242 on the third bending block 24 is adapted to the third limiting strip 232 on the second bending block 23 and the third limiting groove 241 is adapted to the second limiting strip 212 on the base 21, the third bending block 24 can only slide up and down in the vertical direction.

[0036] Reference Figure 3 , Figure 4 , Figure 6As shown, in this embodiment, the side plate 25 is further provided with a fifth limiting groove 251 and a fourth limiting strip 252 to restrict the movement direction of the first bending block 22, the second bending block 23, and the third bending block 24; both ends of the first bending block 22 are provided with inclined first end face limiting grooves 222, and the first end face limiting grooves 222 at both ends of the first bending block 22 are adapted to the fourth limiting strip 252 on the side plate 25; both ends of the second bending block 23 are provided with first end face limiting strips 233, and both ends of the third bending block 24 are provided with second end face limiting strips 243, and the first end face limiting strips 233 and the fourth limiting strip 252 at both ends of the second bending block 23 are adapted to the fourth limiting strip 252 on the side plate 25; both ends of the second bending block 23 are provided with first end face limiting strips 233, and both ends of the third bending block 24 are provided with second end face limiting strips 243, and the first end face limiting strips 233 and the fourth limiting strip 252 at both ends of the second bending block 24 are adapted to the fourth limiting strip 252 on the side plate 25. The second end face limiting strips 243 at both ends of the three-bend block 24 overlap and are adapted to the fifth limiting groove 251 on the side plate 25. The fifth limiting groove 251 limits the ends of the second bend block 23 and the third bend block 24, so that the second bend block 23 and the third bend block 24 can only slide up and down in the vertical direction, preventing the second bend block 23 and the third bend block 24 from deviating during the sliding process. The fourth limiting strip 252 limits the end of the first bend block 22, so that the first bend block 22 can only slide along the inclined first end face limiting groove 222, preventing the first bend block 22 from deviating during the sliding process.

[0037] Reference Figure 2 or Figure 4 As shown, in this embodiment, the side plate 25 is provided with a first reset device 26, a second reset device 27, and a third reset device 28 for supporting the first bending block 22, the second bending block 23, and the third bending block 24 and for resetting the first bending block 22, the second bending block 23, and the third bending block 24. The first reset device 26, the second reset device 27, and the third reset device 28 respectively support the first bending block 22, the second bending block 23, and the third bending block 24, so that the moving order of the first bending block 22, the second bending block 23, and the third bending block 24 remains unchanged, and the third bending block 24 only starts to move after being pushed by the second bending block 23, preventing the first bending block 22 from moving with the third bending block 24, and ensuring that the bending process is carried out in the set order.

[0038] Reference Figure 2 or Figure 4As shown, in this embodiment, each side plate 25 is provided with a first through groove 253, a second through groove 254, and a third through groove 255. Both ends of the first bending block 22, the second bending block 23, and the third bending block 24 are provided with protrusions. The protrusion on the first bending block 22 passes through the first through groove 253 on the side plate 25 and is fixedly connected to one end of the first reset device 26, while the other end of the first reset device 26 is fixedly connected to the side plate 25. The protrusion on the second bending block 23 passes through the second through groove 254 on the side plate 25 and is fixedly connected to one end of the second reset device 27, while the other end of the second reset device 27 is fixedly connected to the side plate 25. The third bending block... The protrusion on 24 passes through the third through groove 255 on the side plate 25 and is fixedly connected to one end of the third reset device 28. The other end of the third reset device 28 is fixedly connected to the side plate 25. The supporting force of the first reset device 26 is greater than that of the third reset device 28. The first through groove 253, the second through groove 254 and the third through groove 255 facilitate the movement of the protrusions on the first bending block 22, the second bending block 23 and the third bending block 24. At the same time, the protrusions on the first bending block 22, the second bending block 23 and the third bending block 24 are respectively connected to the side plate 25 to the first reset device 26, the second reset device 27 and the third reset device 28.

[0039] Reference Figure 6 As shown, in this embodiment, a limiting plate 223 is provided at the top of the horizontal straight plate at the top of the first bending block 22; multiple rotating shafts 224 are rotatably connected to both the upper and lower sides of the top horizontal straight plate. The rotating shafts 224 are all detachably and fixedly connected to the first bending block 22 through pressure plates 225 for limiting. When the first bending block 22 initially moves, the position of the third bending block 24 remains unchanged. The first bending is facilitated by the rotating shafts 224 on the upper side of the first bending block 22; when the second bending block 23 starts to push the first bending block 22, the first bending... Block 22 begins to slide along the inclined plane and approaches the third bending block 24. The pivot 224 on the lower side of the first bending block 22 facilitates the completion of the second bend. At the same time, the pivot 224 can prevent the first bending block 22 from rubbing against the metal surface and causing scratches. By setting multiple pivots 224, the bending stiffness of the pivot 224 can be increased by reducing the length of the pivot 224, thereby reducing the probability of damage to the pivot 224. The pressure plate 225 facilitates the fixing of the pivot 224, thereby facilitating the installation and removal of the pivot 224.

[0040] Reference Figure 2 and Figure 4-6 As shown in this embodiment, this application also discloses a bending machine, including the above-mentioned sheet metal bending upper die 1.

[0041] Reference Figure 2 and Figure 4-6 As shown, in this embodiment, the upper mold 1 is L-shaped, and the L-shaped upper mold 1 facilitates support for the second bending.

[0042] Example 2 When applied to this utility model, such as Figure 5 As shown, the metal plate to be bent is placed on top of the first bending block 22 and the third bending block 24, and the edge of the metal plate to be bent is abutted against the limiting plate 223 on top of the first bending block 22. Figure 5 As shown in S1, the bending machine is then started, causing the upper die 1 on the bending machine to press downwards. The third bending block 24 moves downwards under the pressure of the upper die 1, while the first bending block 22 remains stationary. The first bending is completed through the relative movement between the third bending block 24 and the first bending block 22. Figure 5 As shown in S2; the upper die 1 continues to move downwards, causing the lower end of the third bending block 24 to begin contacting the top of the horizontal end of the second bending block 23; as the upper die 1 continues to move downwards, it drives the metal plate downwards, eventually causing the second bending block 23 to abut against the first bending block 22 under the push of the third bending block 24, as shown in S2; Figure 5 As shown in S3; after being pushed from above, the first bending block 22 begins to move downward along the inclined surface at the bottom of the base 21. Due to the existence of the inclined surface, the first bending block 22 moves closer to the third bending block 24 during its downward movement, and the second bend is completed by the L-shaped upper die 1, as shown in S3. Figure 5 Shown in S4.

[0043] After two bends, the upper die 1 returns to its upward position. The first bending block 22, under the action of the first reset device 26 and the inclined plane, moves upward while simultaneously returning to its original position away from the upper die 1. The second bending block 23 returns to its upward position under the action of the second reset device 27, and the first bending block 22 returns to its upward position under the action of the first reset device 26. Figure 5 As shown in S5; when the first bending block 22 rises to the top of the inclined plane and stops moving, the metal plate is completely separated from the first bending block 22, as shown in S5. Figure 5 As shown in S6; the upper mold 1 continues to rise. When the second bending block 23 and the third bending block 24 move upward under the action of the second reset device 27 and the third reset device 28 respectively, and are reset to the top, the top of the third bending block 24 is flush with the top of the second reset device 27, as shown in S6. Figure 5 As shown in S7; the upper mold 1 continues to move upward, causing the metal plate to completely detach from the lower mold 2, as shown. Figure 5 As shown in S8, the metal plate after two bends can be removed.

[0044] Because multiple rotating shafts 224 are rotatably connected to both the upper and lower sides of the horizontal straight plate at the top of the first bending block 22, the first bending block 22 can prevent friction between itself and the metal plate surface and scratches from appearing on the metal plate surface when it moves relative to the upper die 1. By setting multiple rotating shafts 224, the bending stiffness of the rotating shafts 224 can be improved, while the friction at the connection between the rotating shafts 224 and the first bending block 22 can be reduced, thus reducing the probability of damage to the rotating shafts 224. Since the upper die 1 and the third bending block 24 always clamp the metal plate during the bending process, the metal plate is prevented from shifting, ensuring the accuracy of the two bending processes. It is convenient to use and has high bending efficiency, and has wide application value in the field of sheet metal bending technology.

[0045] The directional terms used in this utility model, such as "center," "up," "down," "left," "right," "vertical," "horizontal," "inner," and "outer," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sheet metal bending die, characterized in that: Comprises a base (21), a first bending block (22), a second bending block (23), a third bending block (24) and two side plates (25), wherein the base (21) is U-shaped, one side of the inner bottom of the base (21) is provided with an inclined surface, one side of the bottom of the first bending block (22) is provided with an inclined surface, and the first bending block (22) moves along the inclined surface at the bottom of the base (21) via the inclined surface; the second bending block (23) is located at the middle part of the first bending block (22), the third bending block (24) is located at the top of the second bending block (23), the side plates (25) are fixed on both sides of the base (21), both ends of the first bending block (22), the second bending block (23) and the third bending block (24) slide relatively relative to the side plates (25), and the side plates (25) are further provided with a first reset device (26), a second reset device (27) and a third reset device (28) that support the first bending block (22), the second bending block (23) and the third bending block (24) and enable the same to reset.

2. The sheet metal bending die according to claim 1, characterized in that: The first bending block (22) is U-shaped, and both the top end and the bottom end of the first bending block (22) are horizontal straight plates; the second bending block (23) is Z-shaped and comprises two vertical ends, the two vertical ends are respectively arranged at the bottom of the left side and the top of the right side of the horizontal end, the vertical end of the second bending block (23) located at the bottom of the horizontal end is away from the inclined surface of the first bending block (22), and the horizontal end of the second bending block (23) is always located above the horizontal straight plate at the bottom end of the first bending block (22); the third bending block (24) is rectangular, the bottom of the third bending block (24) is always located above the horizontal end of the second bending block (23), when the first bending block (22) rises to the topmost position, one side of the third bending block (24) close to the first bending block (22) fits with the edge of the horizontal straight plate at the top end of the first bending block (22).

3. The sheet metal bending die according to claim 2, characterized in that: A plurality of first limit strips (211) evenly distributed along the inclined surface are arranged on the inclined surface at the bottom of the base (21); a first limit groove (221) adapted to the first limit strips (211) is arranged below the inclined surface at the bottom of the first bending block (22); a second limit strip (212) is arranged on a side of the inner bottom of the base (21) away from the inclined surface, and a second limit groove (231) is arranged on the side wall of the vertical end of the second bending block (23) close to the second limit strip (212); a third limit groove (241) is arranged on the side wall of a side of the third bending block (24) away from the first bending block (22), the third limit groove (241) is aligned with the second limit groove (231) and both are adapted to the second limit strip (212) on the inner bottom of the base (21).

4. The sheet metal bending die according to claim 2, characterized in that: A third limit strip (232) is arranged on the inner side of the vertical end of the second bending block (23) located at the right side of the horizontal end, a third limit groove (241) and a fourth limit groove (242) are respectively arranged on the left and right sides of the third bending block (24), the third limit groove (241) communicates with the second limit groove (231) on the second bending block (23), and the fourth limit groove (242) is adapted to the third limit strip (232) on the second bending block (23).

5. The sheet metal bending die according to claim 1, characterized in that: The side plate (25) is also provided with a fifth limiting groove (251) and a fourth limiting strip (252) to restrict the movement direction of the first bending block (22), the second bending block (23) and the third bending block (24); both ends of the first bending block (22) are provided with a first end face limiting groove (222) at an incline, and the first end face limiting grooves (222) at both ends of the first bending block (22) are adapted to the fourth limiting strip (252) on the side plate (25); both ends of the second bending block (23) are provided with a first end face limiting strip (233), and both ends of the third bending block (24) are provided with a second end face limiting strip (243). The first end face limiting strips (233) at both ends of the second bending block (23) and the second end face limiting strips (243) at both ends of the third bending block (24) overlap each other and are adapted to the fifth limiting groove (251) on the side plate (25).

6. The sheet metal bending die according to claim 1, characterized in that: The side plate (25) is provided with a first reset device (26), a second reset device (27) and a third reset device (28) for supporting the first bending block (22), the second bending block (23) and the third bending block (24) and for resetting the first bending block (22), the second bending block (23) and the third bending block (24).

7. The sheet metal bending die according to claim 1, characterized in that: Each side plate (25) is provided with a first through groove (253), a second through groove (254), and a third through groove (255). Both ends of the first bending block (22), the second bending block (23), and the third bending block (24) are provided with protrusions. The protrusion on the first bending block (22) passes through the first through groove (253) on the side plate (25) and is fixedly connected to one end of the first reset device (26). The other end of the first reset device (26) is fixedly connected to the side plate (25); the protrusion on the second bending block (23) passes through... After passing through the second through groove (254) on the side plate (25), it is fixedly connected to one end of the second reset device (27), and the other end of the second reset device (27) is fixedly connected to the side plate (25); the protrusion on the third bending block (24) passes through the third through groove (255) on the side plate (25) and is fixedly connected to one end of the third reset device (28), and the other end of the third reset device (28) is fixedly connected to the side plate (25); the supporting force of the first reset device (26) is greater than the supporting force of the third reset device (28).

8. The sheet metal bending die according to claim 1, characterized in that: The top of the first bending block (22) has a limiting plate (223) on the top of the horizontal straight plate; multiple rotating shafts (224) are rotatably connected to the upper and lower sides of the end of the horizontal straight plate, and the rotating shafts (224) are all detachably fixedly connected to the first bending block (22) through the pressure plate (225) for limiting.

9. A bending machine, characterized in that, Includes the sheet metal bending die as described in any one of claims 1 to 8.

10. The bending machine according to claim 9, characterized in that: It also includes the L-shaped upper mold (1).

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