A die for negative angle flanging

Abstract

This disclosure relates to a die for stamping a negative angle flange, including a base plate, a negative angle forming mechanism, and a core-pulling mechanism. The negative angle forming mechanism includes a core-inserting die and a stamping punch. The core-inserting die has a groove, and the stamping punch has a protrusion that mates with the groove. The protrusion is pressed into the groove, causing the side of the workpiece to be stamped to bend inward to form a flange. The core-pulling mechanism includes a fixed plate, a cylinder, and a connecting rod assembly. The core-pulling mechanism is constructed such that the cylinder, through the connecting rod assembly, drives the core-inserting die to perform an inserting and withdrawing motion along the extension direction of the core-inserting die. Through the above technical solution, the protrusion pressed into the groove causes the side of the workpiece to be stamped to bend inward to form a negative angle flange. The cylinder, through the connecting rod assembly, can drive the core-inserting die to be pulled out from the stamped workpiece, and then feed it to the next step via a feeder. This effectively reduces the development of a single forming die tooling, lowers tooling development costs, and improves production efficiency, thereby solving the problems of low workpiece production efficiency and high production costs.

Description

Technical Field

[0001] This disclosure relates to the field of stamping die technology, and in particular to a die for stamping negative angle flanges. Background Technology

[0002] In existing stamping dies, single-operation dies not only waste labor and reduce production efficiency, but also increase die costs. In order to save costs, most interior parts generally use progressive dies. However, some interior parts have very complex structures, especially negative angle flanging dies. For products with negative angles, in the manufacturing process, after the existing progressive die stamps the workpiece, it is necessary to transfer the stamped workpiece to the flanging station to make the negative angle. This results in low production efficiency and high production costs.

[0003] A negative angle is an angle that, when rotated around its vertex in a plane, can have two different directions: counterclockwise and clockwise. Angles generated by counterclockwise rotation are defined as positive angles, while those generated by clockwise rotation are defined as negative angles. Flanging is a stamping process that uses a die to create a straight wall or flange at a certain angle along a closed or open curved edge on a flat or curved portion of a workpiece. Summary of the Invention

[0004] This disclosure provides a die for stamping negative angle flanges, which at least partially solves the problems of low workpiece production efficiency and high production costs.

[0005] The specific technical solutions provided in this disclosure are as follows:

[0006] This disclosure discloses a die for stamping a negative angle flange, used to stamp the side of a workpiece to be stamped, comprising: a base plate and a negative angle forming mechanism disposed on the base plate; the negative angle forming mechanism includes a pair of insert dies for positioning the workpiece to be stamped, and the opposite sides of the two insert dies are respectively recessed to form grooves; and a stamping punch disposed outside the insert dies, the stamping punch having a protrusion that cooperates with the grooves, the negative angle forming mechanism being configured such that when the insert dies and the stamping punch are closed, the protrusion is pressed into the groove, causing the side of the workpiece to be stamped to bend inward to form a flange;

[0007] It also includes a core-pulling mechanism, which includes a fixed plate, a cylinder, and a connecting rod assembly. The fixed plate is spaced below the base plate, and the cylinder is mounted on the fixed plate. The cylinder is connected to the insert die through the connecting rod assembly. The core-pulling mechanism is configured such that the cylinder drives the insert die to perform insertion and withdrawal movements along the extension direction of the insert die through the connecting rod assembly.

[0008] Preferably, the negative angle forming mechanism further includes a stamping block, the stamping block including a block body and a protruding rib disposed on the top of the block body, the block body being disposed on the base plate, the protruding rib being disposed on the block body along the extension direction of the insert die and located between the two insert dies, and the side of the protruding rib facing the insert die abutting against the two insert dies respectively.

[0009] Preferably, the block has a positioning block on the side facing the base plate, and the base plate has a positioning groove that cooperates with the positioning block. The positioning block is disposed in the positioning groove to fix the stamping block.

[0010] Preferably, the mold further includes a driving mechanism disposed on the base plate. The driving mechanism includes a wedge driving block and a wedge slider that wedges with the wedge driving block. The wedge slider is slidably connected to the base plate, and the stamping punch is disposed on the wedge slider. The wedge driving block is configured to drive the wedge slider to move the stamping punch from the initial position to the stamping position.

[0011] Preferably, each of the wedge sliders is provided with a pressure plate at both ends, one end of the pressure plate is pressed against the wedge slider, and the other end is connected to the base plate.

[0012] Preferably, each of the wedge sliders is provided with a first nitrogen spring, which is configured to drive the wedge slider to move from the stamping position to the initial position.

[0013] Preferably, the wedge slider has a support platform on the side facing the insert die along the extension direction of the wedge slider, the stamping punch is placed on the support platform and screwed to the wedge slider.

[0014] Preferably, the stamping punch and the wedge slider are provided with corresponding pin holes, and a pin is inserted into the pin hole.

[0015] Preferably, the driving mechanism further includes a self-lubricating guide plate disposed on the wedge driving block, wherein the self-lubricating guide plate is configured to be movable relative to the wedge slider in the stamping state.

[0016] Preferably, the core-pulling mechanism further includes a slide assembly, which includes a slide rail and a slider. The slide rail is disposed on the fixed plate along the extension direction of the core-pulling die. The slider is connected to the output end of the cylinder. The bottom end of the connecting rod assembly is connected to the slider. The slider is nested on the slide rail and is movable relative to the slide rail.

[0017] Preferably, the fixing plate is further provided with a stop block, which is located at the end of the slide rail away from the cylinder, so as to abut against the slider.

[0018] Preferably, the mold further includes a first guide assembly movably connected to the base plate. The first guide assembly includes a first guide block and a second guide block, which are respectively disposed at both ends of the insert die. The first guide block and the second guide block are respectively provided with guide holes. The insert die is inserted into the first guide block and the second guide block in sequence through the guide holes and slides in cooperation with the first guide assembly.

[0019] Preferably, the base plate is further provided with a limiting block, which is located on the side of the second guide block away from the first guide block and abuts against the second guide block.

[0020] Preferably, the mold further includes a material ejection mechanism, which includes a second nitrogen spring, a fixed base, and a transmission assembly. The second nitrogen spring is disposed below the fixed plate, with its top end connected to the fixed plate and its bottom end connected to the fixed base to fix the second nitrogen spring. The transmission assembly is disposed between the fixed plate and the base plate, with its bottom end connected to the fixed plate and its top end penetrating the base plate and connected to the first guide assembly. The material ejection mechanism is configured such that the second nitrogen spring drives the transmission assembly through the fixed plate, causing the first guide assembly to move in the direction of movement of the transmission assembly.

[0021] Preferably, the mold further includes a second guide assembly, which is disposed below the fixed plate and has its top end passing through the fixed plate to limit the movement of the ejection mechanism along the direction of the second nitrogen spring rising or falling.

[0022] Preferably, the mold further includes a positioning detection mechanism, which is disposed on the base plate and configured to detect whether the connecting rod assembly has moved to the positioning position.

[0023] The beneficial effects of this disclosure are as follows:

[0024] In a progressive die, a negative angle forming mechanism and a core-pulling mechanism are designed to work together. The core-inserting die positions the workpiece to be stamped, and the protrusion on the stamping punch presses into the groove of the core-inserting die, causing the side of the workpiece to be stamped to bend inward to form a negative angle flange. A cylinder, through a connecting rod assembly, can pull the core-inserting die out of the workpiece and feed it to the next step via a feeder. This allows the negative angle flange of the workpiece to be stamped to be stamped in the same progressive die, effectively reducing the development of a single forming die tooling, lowering tooling development costs, and improving production efficiency. This solves the problems of low workpiece production efficiency and high production costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the die for stamping negative angle flanges, the mounting plate, and the press in this embodiment of the present disclosure.

[0027] Figure 2 This is a schematic diagram of the overall structure of the die for stamping negative angle flanges in an embodiment of this disclosure;

[0028] Figure 3 This is a schematic diagram of the overall structure of the ferrule mold in an embodiment of this disclosure;

[0029] Figure 4 This is a schematic diagram of the cross-sectional structure of the insert die;

[0030] Figure 5 This is a schematic diagram of the structure of the wedge slider and the stamping punch in the embodiments of this disclosure;

[0031] Figure 6 To highlight Figure 2 Schematic diagram of the drive mechanism and pressure plate;

[0032] Figure 7 To highlight Figure 2 Schematic diagram of the negative angle forming mechanism and the drive mechanism;

[0033] Figure 8 for Figure 7 A magnified structural diagram of part A in the middle;

[0034] Figure 9 To highlight the overall structural diagram of the workpiece to be stamped, the stamping punch, and the stamping block;

[0035] Figure 10 for Figure 9 A schematic diagram of the overall structure of the workpiece to be stamped.

[0036] Figure 11 To highlight the structural diagram of the fit between the stamped part and the base plate;

[0037] Figure 12 To highlight the structural diagram of the core-pulling mechanism, the core-inserting die, and the first guide assembly;

[0038] Figure 13 for Figure 12 A partial structural diagram of the first guide component;

[0039] Figure 14 The schematic diagram highlights the overall structure of the material ejection mechanism and the core pulling mechanism.

[0040] Figure label:

[0041] 1. Base plate; 101. Negative angle forming mechanism; 1011. Insert die; 1012. Stamping punch; 1013. Groove; 1014. Protruding strip; 1015. First nitrogen spring; 102. Drive mechanism; 1021. Wedge drive block; 1022. Wedge slider; 1023. Support platform; 1024. Pin hole; 1025. Self-lubricating guide plate; 103. Pressure plate; 104. Limiting block; 105. Stamping block; 1051. Block body; 1052. Protruding rib; 1053. Positioning block; 1054. 1. Positioning groove; 106. First guide block; 107. Second guide block; 2. Workpiece to be stamped; 201. Side edge; 202. Flanged edge; 3. Core pulling mechanism; 301. Fixing plate; 302. Cylinder; 303. Connecting rod assembly; 304. Slide assembly; 3041. Slide rail; 3042. Slider; 305. Stop block; 4. Unloading mechanism; 401. Second nitrogen spring; 402. Fixing seat; 403. Transmission assembly; 5. Second guide assembly; 6. Position detection mechanism; 7. Mounting plate; 8. Press. Detailed Implementation

[0042] The preferred embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict.

[0043] This embodiment provides a die for stamping a negative angle flange, used to stamp the side 201 of the workpiece 2 to be stamped, such as... Figures 1 to 14As shown, it includes: a base plate 1 and a negative angle forming mechanism 101 disposed on the base plate 1; the negative angle forming mechanism 101 includes a pair of insert dies 1011 for positioning the workpiece 2 to be stamped, and the opposite sides of the two insert dies 1011 are respectively recessed to form grooves 1013; and a stamping punch 1012 disposed outside the insert die 1011, the stamping punch 1012 is provided with a protrusion 1014 that cooperates with the groove 1013, the negative angle forming mechanism 101 is configured such that when the insert die 1011 and the stamping punch 1012 are closed, the protrusion 1014 is pressed into the groove 1013, so that the side 201 of the workpiece 2 to be stamped is bent inward to form a flange 202.

[0044] It also includes a core-pulling mechanism 3, which may include a fixed plate 301, a cylinder 302 and a connecting rod assembly 303. The fixed plate 301 is spaced below the base plate 1, and the cylinder 302 is mounted on the fixed plate 301. The cylinder 302 is connected to the insert die 1011 through the connecting rod assembly 303. The core-pulling mechanism 3 is configured such that the cylinder 302 drives the insert die 1011 to perform insertion and withdrawal movements along the extension direction of the insert die 1011 through the connecting rod assembly 303.

[0045] In this embodiment, the base plate 1 is rectangular and horizontally arranged, and is fixed to the progressive die by a connecting rod. The negative angle forming mechanism 101 is arranged on the upper surface of the base plate 1. The insert die 1011 is rod-shaped and parallel to the base plate 1. The outer contour of the insert die 1011 is adapted to the inner contour of the workpiece 2 to be stamped. On the opposite sides of the two insert dies 1011, grooves 1013 are respectively formed inward along their extension direction. The length of the grooves 1013 is greater than or equal to the length of the workpiece 2 to be stamped. Two stamping punches 1012 are provided and are respectively arranged on both sides of the insert die 1011. The stamping punches 1012 are rectangular blocks. On the side of the stamping punch facing the insert die 1011, a protrusion 1014 adapted to the groove 1013 is provided along the extension direction of the stamping punch 1012, and its length is equal to the length of the groove 1013. This ensures the complete stamping of the workpiece and avoids problems that could affect its subsequent use. The fixing plate 301 is also rectangular and positioned directly below the base plate 1. The cylinder 302 is connected to the fixing plate 301 along the extension direction of the insert die 1011 via locking bolts. This arrangement facilitates the installation, removal, and maintenance of the cylinder 302. The top end of the connecting rod assembly 303 is connected to the end of the insert die 1011, and the tail end is connected to the output end of the cylinder 302. Air is pumped to the cylinder 302, allowing the cylinder 302 to drive the insert die 1011 along its extension direction via the connecting rod assembly 303, thus extracting or inserting the insert die 1011 from the workpiece 2 to be stamped.

[0046] In actual use, before stamping, cylinder 302 drives the insert die 1011 to be pulled out from the negative angle forming mechanism 101 via connecting rod assembly 303. Then, the feeding mechanism transports the workpiece 2 to be stamped to the designated position on the negative angle forming mechanism 101. Cylinder 302 then drives the insert die 1011 to be inserted into the workpiece 2 via connecting rod assembly 303, fixing it and starting the stamping process. During the stamping process, the stamping punches 1012 on both sides move towards the insert die 1011 simultaneously. The stamping punches 1012 and the insert die 1011 close together, and the protrusion 1014 presses the side edge 201 of the workpiece 2 into the groove 1013, bending it to form a flange 202. After stamping is completed, cylinder 302 drives the insert die 1011 to be pulled out via connecting rod assembly 303, and the feeding mechanism proceeds to the next feeding step.

[0047] Through the above technical solution, by setting a negative angle forming mechanism 101 and a core-pulling mechanism 3 in the progressive die, the insert die 1011 positions the workpiece 2 to be stamped, and the protrusion 1014 on the stamping punch 1012 presses into the groove 1013 of the insert die 1011, causing the side edge 201 of the workpiece 2 to be stamped to bend inward to form a negative angle flange 202; the cylinder 302 can drive the insert die 1011 to be pulled out from the workpiece through the connecting rod assembly 303, and then feed it to the next step through the feeder. This realizes that the stamping of the negative angle flange 202 of the workpiece 2 is carried out in the same progressive die, effectively reducing the development of a forming die tooling, reducing tooling development costs, and improving production efficiency, thereby solving the problems of low workpiece production efficiency and high production costs. At the same time, it also saves die space, reduces safety risks, and makes operation more convenient.

[0048] In some embodiments, the negative angle forming mechanism 101 further includes a stamping block 105. The stamping block 105 may include a block body 1051 and a protruding rib 1052 disposed on the top of the block body 1051. The block body 1051 is disposed on the base plate 1. The protruding rib 1052 is disposed on the block body 1051 along the extending direction of the insert die 1011 and is located between the two insert dies 1011. The side of the protruding rib 1052 facing the insert die 1011 abuts against the two insert dies 1011 respectively. The block 1051 is rectangular in shape and is mounted on the base plate 1 along the extension direction of the insert die 1011. A rib 1052 is provided on the top of the block 1051 along the extension direction of the insert die 1011. The rib 1052 is located between the two insert dies 1011. The two sides of the rib 1052 facing the insert die 1011 abut against the side walls of the insert die 1011. When the stamping punch 1012 closes with the insert die 1011, the side of the stamping punch 1012 facing the block 1051 abuts against the outer wall of the block 1051. This design prevents the insert die 1011 from gradually bending and deforming inwards during repeated stamping processes, thus avoiding affecting the production of the finished workpiece 2, reducing production costs, and improving economic efficiency.

[0049] In some embodiments, a positioning block 1053 is provided on the side of the block 1051 facing the base plate 1, and a positioning groove 1054 is provided on the base plate 1 to cooperate with the positioning block 1053. The positioning block 1053 is disposed in the positioning groove 1054 to fix the stamping block 105. This arrangement can ensure that the stamping block 105 will not accidentally detach from the fixing plate 301 during the stamping process, thereby improving the reliability of the device and reducing the safety risks during the use of the device.

[0050] In some embodiments, the mold may further include a drive mechanism 102 disposed on the base plate 1. The drive mechanism 102 includes a wedge drive block 1021 and a wedge slider 1022 that wedges with the wedge drive block 1021. The wedge slider 1022 is slidably connected to the base plate 1, and a stamping punch 1012 is disposed on the wedge slider 1022. The wedge drive block 1021 is configured to drive the wedge slider 1022 to move the stamping punch 1012 from an initial position to a stamping position. The mold may further include a press 8 and a mounting plate 7. The press 8 is disposed above the base plate 1 and parallel to the base plate 1. The bottom surface of the press 8 is connected to the mounting plate 7. The wedge drive block 1021 is disposed on the bottom surface of the mounting plate 7 and detachably connected to it. This facilitates the subsequent installation, removal, and maintenance of the wedge drive block 1021, improving work efficiency. The wedge slider 1022 and the stamping punch 1012 are arranged in a one-to-one correspondence, and the stamping punch 1012 is disposed on the wedge slider 1022. During stamping, the press 8 presses down, causing the wedge drive block 1021 to move vertically downward. The wedge drive block 1021 cooperates with the wedge slider 1022, driving the wedge slider 1022 to slide towards the insert die 1011, while simultaneously driving the stamping punch 1012 to move synchronously, so that the stamping punch 1012 moves from the initial position to the stamping position, in order to stamp the side 201 of the workpiece 2 to be stamped. The setting of the drive mechanism 102 improves production efficiency, reduces labor costs, and realizes automated operation.

[0051] In some embodiments, each wedge slider 1022 has a pressure plate 103 at both ends. One end of the pressure plate 103 presses against the wedge slider 1022, and the other end is connected to the base plate 1. In this embodiment, the pressure plate 103 is L-shaped, and the end of the wedge slider 1022 has an extension. The short side of the pressure plate 103 presses against the extension of the wedge slider 1022, and the extension does not detach from the short side during sliding. The long side of the pressure plate 103 is fixed to the base plate 1 and detachably connected to the base plate 1. In this way, when the wedge slider 1022 slides, the pressure plate 103 can ensure that the wedge slider 1022 moves along a preset route and does not detach from the base plate 1, further improving the reliability of the device and reducing safety risks.

[0052] In some embodiments, each wedge slider 1022 is provided with a first nitrogen spring 1015, which is configured to drive the wedge slider 1022 to move from the stamping position to the initial position. After stamping is completed, the press 8 moves upward, the wedge drive block 1021 moves upward with the press 8, and the wedge slider 1022 slides away from the stamping block 105 under the action of the first nitrogen spring 1015 until the wedge slider 1022 returns to the initial position. This configuration realizes automated operation, is simple and convenient, and further improves work efficiency.

[0053] In some embodiments, a support platform 1023 is provided on the side of the wedge slider 1022 facing the insert die 1011 along the extending direction of the wedge slider 1022. The stamping punch 1012 is placed on the support platform 1023 and connected to the wedge slider 1022 with screws. The connection between the wedge slider 1022 and the stamping punch 1012 by screws can fix the stamping punch 1012 on the wedge slider 1022, avoiding the stamping punch 1012 from shifting or detaching during the stamping process, and further reducing the safety risks of using the device.

[0054] In some embodiments, the stamping punch 1012 and the wedge slider 1022 are respectively provided with pin holes 1024, and a pin is inserted into the pin hole 1024. The stamping punch 1012 and the wedge slider 1022 are further fixed by the pin, ensuring the positioning accuracy of the stamping punch 1012 and the tightness of the connection, and further improving the reliability of the device.

[0055] In some embodiments, the drive mechanism 102 may further include a self-lubricating guide plate 1025, which is disposed on the wedge drive block 1021. The self-lubricating guide plate 1025 is configured to be movable relative to the wedge slider 1022 in the stamping state. The self-lubricating guide plate 1025 is disposed on the contact surface between the wedge drive block 1021 and the wedge slider 1022, and is detachably connected to the wedge drive block 1021 by screws. The self-lubricating guide plate 1025 provides lubrication and has high load-bearing capacity, impact resistance, high temperature resistance, and strong self-lubricating ability. Thus, when the wedge drive block 1021 drives the wedge slider 1022 to slide, the lubrication of the self-lubricating guide plate 1025 reduces the frictional resistance between the wedge drive block 1021 and the wedge slider 1022, improves the power performance of the drive mechanism 102, reduces mold wear, improves the reliability of the device, and reduces mold costs.

[0056] In some embodiments, the core-pulling mechanism 3 further includes a slide assembly 304, which includes a slide rail 3041 and a slider 3042. The slide rail 3041 is disposed on the fixed plate 301 along the extending direction of the core-pulling die 1011. The slider 3042 is connected to the output end of the cylinder 302, and the bottom end of the connecting rod assembly 303 is connected to the slider 3042. The slider 3042 is nested on the slide rail 3041 and is movable relative to the slide rail 3041. The slider 3042 provides a support platform for the connecting rod assembly 303, making the connection between the connecting rod assembly 303 and the output end of the cylinder 302 more stable. The slider 3042 can be arranged in an "I" shape, with the slide rail 3041 matching the slider 3042. The slider 3042 moves with the cylinder 302 within the slide rail 3041, exhibiting high guiding accuracy and good motion stability, further improving the reliability of the device.

[0057] In some embodiments, the fixing plate 301 is further provided with a stop block 305, which is located at the end of the slide rail 3041 away from the cylinder 302, for abutting against the slider 3042. In this embodiment, the stop block 305 can be a polyurethane stop block. When the slider 3042 abuts against the polyurethane stop block 305, the polyurethane stop block can play a role in noise reduction and protecting the slider 3042. It should be understood that in other embodiments, the stop block 305 can also be made of other materials, which can be set according to actual needs, and no limitation is made here.

[0058] In some embodiments, the mold further includes a first guide assembly movably connected to the base plate 1. The first guide assembly includes a first guide block 106 and a second guide block 107, which are respectively disposed at both ends of the insert die 1011. Guide holes are respectively provided on the first guide block 106 and the second guide block 107. The insert die 1011 is inserted into the first guide block 106 and the second guide block 107 sequentially through the guide holes and slides in cooperation with the first guide assembly. Both the first guide block 106 and the second guide block 107 have a rectangular block structure. The insert die 1011 passes through the first guide block 106 and the second guide block 107 sequentially and can reciprocate along the first guide assembly. The first guide assembly provides a certain guiding effect for the insert die 1011, improving the insertion accuracy when the insert die 1011 reciprocates and enhancing the reliability of the device.

[0059] In some embodiments, a limiting block 104 is further provided on the base plate 1. The limiting block 104 is located on the side of the second guide block 107 opposite to the first guide block 106 and abuts against the second guide block 107. The limiting block 104 is detachably provided on the base plate 1 and abuts against the second guide block 107 to prevent the second guide block 107 from being ejected from the mold when the insert die 1011 reciprocates, thereby reducing safety risks and mold costs.

[0060] In some embodiments, the mold further includes an ejection mechanism 4, which may include a second nitrogen spring 401, a fixed base 402, and a transmission assembly 403. The second nitrogen spring 401 is disposed below the fixed plate 301, with its top end connected to the fixed plate 301 and its bottom end connected to the fixed base 402 to fix the second nitrogen spring 401. The transmission assembly 403 is disposed between the fixed plate 301 and the base plate 1, with its bottom end connected to the fixed plate 301 and its top end penetrating the base plate 1 and connected to the first guide assembly. The ejection mechanism 4 is configured such that the second nitrogen spring 401 drives the transmission assembly 403 through the fixed plate 301, causing the first guide assembly to move in the direction of movement of the transmission assembly 403. In this embodiment, the second nitrogen spring 401 is bolted to the fixed plate 301. The transmission assembly 403 includes a transmission frame, and two transmission rods are provided at the top of the transmission frame corresponding to the first guide assembly. Both transmission rods pass through the bottom plate 1 and are fixedly connected to the first guide block 106 and the second guide block 107, respectively. After the workpiece 2 to be stamped is completed, the drive mechanism 102 and the negative angle forming mechanism 101 are first reset, and then the unloading mechanism 4 is activated. The second nitrogen spring 401 pushes the fixed plate 301 to move upward. The upward movement of the fixed plate 301 drives the transmission frame to move upward. The upward movement of the transmission frame is transmitted to the first guide assembly and makes it move upward synchronously. The insert die 1011 inserted on the first guide assembly moves upward synchronously with the first guide assembly, thereby lifting the strip. The core pulling mechanism 3 is activated to pull the insert die 1011 out of the stamped workpiece, and then the feeding belt proceeds to the next feeding step to complete the unloading. The setting of the unloading mechanism 4 realizes automated operation, reduces labor costs, and improves production efficiency and economic benefits.

[0061] In some embodiments, the mold further includes a second guide assembly 5, which is disposed below the fixed plate 301, with its top end passing through the fixed plate 301 to limit the movement of the ejection mechanism 4 along the direction of the second nitrogen spring 401's upward or downward movement. The second guide assembly 5 includes a guide seat and a guide rod, one end of which is fixed to the guide seat, and the other end of which passes through the fixed plate 301. The guide rod is parallel to the nitrogen spring. This ensures that the second nitrogen spring 401 moves upward or downward along the direction of the guide rod, improving the overall reliability of the mold.

[0062] In some embodiments, the mold further includes a positioning detection mechanism 6, which is mounted on the base plate 1 and configured to detect whether the connecting rod assembly 303 has moved to the positioning position. In this embodiment, the positioning detection mechanism 6 can be a sensor, which is mounted on the base plate 1 via a bracket and is used to detect whether the connecting rod assembly 303 has moved to the positioning position to determine whether the insert die 1011 has been inserted into place. When the connecting rod assembly 303 moves to the positioning position, the sensor receives a signal, causing the press 8 to move downward and start stamping; if the connecting rod assembly 303 has not moved to the positioning position, the sensor does not receive a signal, and the press 8 does not start. This ensures that no safety accidents or damage to the mold occur during the stamping process.

[0063] In actual use, the feed belt transports the workpiece 2 to be stamped to the designated position. The cylinder 302 inserts the insert die 1011 into the workpiece 2 through the connecting rod assembly 303. The positioning detection mechanism 6 detects that the connecting rod assembly 303 has moved into position. The sensor receives the signal and sends a signal to make the press 8 move downward to start stamping. The wedge drive block 1021 drives the wedge slider 1022 to move the stamping punch 1012, so that the protrusion 1014 on the stamping punch 1012 is pressed into the groove 1013 of the insert die 1011. At the same time, the side 201 of the workpiece 2 to be stamped is bent inward to form a flange 202. After stamping is completed, the press 8 moves upward. The first nitrogen spring 1015 returns the wedge slider 1022 from the stamping position to the initial position. The second nitrogen spring 401 moves upward and transmits the force through the fixed plate 301 to the transmission frame and the first guide assembly, which drives the insert die 1011 to move upward synchronously, thereby lifting the feed belt. Then, cylinder 302, via connecting rod assembly 303, extracts the insert die 1011 from the stamped workpiece, and the feeding belt proceeds to the next feeding step. This mold not only saves mold costs but also saves mold space, reduces safety risks, makes operation more convenient, and achieves fully automated operation.

[0064] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.

[0065] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of the embodiments of this disclosure. Therefore, if these modifications and variations to the embodiments of this disclosure fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include these modifications and variations.

Claims

1. A die for stamping a negative angle flange, used for stamping the side edge (201) of a workpiece (2) to be stamped, characterized in that, include: The base plate (1) and the negative angle forming mechanism (101) disposed on the base plate (1); the negative angle forming mechanism (101) includes a pair of insert dies (1011) for positioning the workpiece (2) to be stamped, and the opposite sides of the two insert dies (1011) are respectively recessed to form grooves (1013); and a stamping punch (1012) disposed outside the insert die (1011), the stamping punch (1012) is provided with a protrusion (1014) that cooperates with the groove (1013), the negative angle forming mechanism (101) is configured such that when the insert die (1011) and the stamping punch (1012) are closed, the protrusion (1014) is pressed into the groove (1013), so that the side (201) of the workpiece (2) to be stamped is bent inward to form a flange (202). It also includes a core-pulling mechanism (3), which includes a fixed plate (301), a cylinder (302) and a connecting rod assembly (303). The fixed plate (301) is spaced below the base plate (1). The cylinder (302) is mounted on the fixed plate (301). The cylinder (302) is connected to the insert die (1011) through the connecting rod assembly (303). The core-pulling mechanism (3) is configured such that the cylinder (302) drives the insert die (1011) to perform insertion and withdrawal movements along the extension direction of the insert die (1011) through the connecting rod assembly (303). The negative angle forming mechanism (101) further includes a stamping block (105), the stamping block (105) includes a block body (1051) and a rib (1052) disposed on the top of the block body (1051). The block body (1051) is disposed on the base plate (1). The rib (1052) is disposed on the block body (1051) along the extension direction of the insert die (1011) and is located between the two insert dies (1011). The side of the rib (1052) facing the insert die (1011) abuts against the two insert dies (1011) respectively. The core-pulling mechanism (3) further includes a slide assembly (304), which includes a slide rail (3041) and a slider (3042). The slide rail (3041) is disposed on the fixed plate (301) along the extension direction of the core insertion die (1011). The slider (3042) is connected to the output end of the cylinder (302). The bottom end of the connecting rod assembly (303) is connected to the slider (3042). The slider (3042) is nested on the slide rail (3041) and is movable relative to the slide rail (3041).

2. The die for stamping negative angle flanges according to claim 1, characterized in that, The block (1051) has a positioning block (1053) on one side facing the base plate (1), and the base plate (1) has a positioning groove (1054) that cooperates with the positioning block (1053). The positioning block (1053) is placed in the positioning groove (1054) to fix the stamping block (105).

3. The die for stamping negative angle flanges according to claim 1, characterized in that, The mold also includes a drive mechanism (102) disposed on the base plate (1). The drive mechanism (102) includes a wedge drive block (1021) and a wedge slider (1022) that wedges with the wedge drive block (1021). The wedge slider (1022) is slidably connected to the base plate (1). The stamping punch (1012) is disposed on the wedge slider (1022). The wedge drive block (1021) is configured to drive the wedge slider (1022) to move the stamping punch (1012) from the initial position to the stamping position.

4. The die for stamping negative angle flanges according to claim 3, characterized in that, Each of the inclined wedge sliders (1022) is provided with a pressure plate (103) at both ends. One end of the pressure plate (103) is pressed onto the inclined wedge slider (1022), and the other end is connected to the base plate (1).

5. The die for stamping negative angle flanges according to claim 3, characterized in that, Each of the wedge sliders (1022) is provided with a first nitrogen spring (1015), which is configured to drive the wedge slider (1022) to move from the stamping position to the initial position.

6. The die for stamping negative angle flanges according to claim 3, characterized in that, The wedge slider (1022) has a support platform (1023) on the side facing the insert die (1011) along the extension direction of the wedge slider (1022). The stamping punch (1012) is placed on the support platform (1023) and is screwed to the wedge slider (1022).

7. The die for stamping negative angle flanges according to claim 3, characterized in that, The stamping punch (1012) and the wedge slider (1022) are respectively provided with pin holes (1024), and a pin is inserted into the pin hole (1024).

8. The die for stamping negative angle flanges according to claim 3, characterized in that, The drive mechanism (102) further includes a self-lubricating guide plate (1025), which is disposed on the wedge drive block (1021). The self-lubricating guide plate (1025) is configured to be movable relative to the wedge slider (1022) in the stamping state.

9. The die for stamping negative angle flanges according to claim 1, characterized in that, The fixed plate (301) is also provided with a stop block (305), which is located at the end of the slide rail (3041) away from the cylinder (302) for abutting against the slider (3042).

10. The die for stamping negative angle flanges according to claim 1, characterized in that, The mold further includes a first guide component movably connected to the base plate (1). The first guide component includes a first guide block (106) and a second guide block (107). The first guide block (106) and the second guide block (107) are respectively disposed at both ends of the insert die (1011). The first guide block (106) and the second guide block (107) are respectively provided with guide holes. The insert die (1011) is inserted into the first guide block (106) and the second guide block (107) in sequence through the guide holes and slides with the first guide component.

11. The die for stamping negative angle flanges according to claim 10, characterized in that, The base plate (1) is also provided with a limiting block (104), which is located on the side of the second guide block (107) away from the first guide block (106) and abuts against the second guide block (107).

12. The die for stamping negative angle flanges according to claim 10, characterized in that, The mold further includes a material ejection mechanism (4), which includes a second nitrogen spring (401), a fixed base (402), and a transmission assembly (403). The second nitrogen spring (401) is disposed below the fixed plate (301), with its top end connected to the fixed plate (301) and its bottom end connected to the fixed base (402) to fix the second nitrogen spring (401). The transmission assembly (403) is disposed between the fixed plate (301) and the base plate (1), with its bottom end connected to the fixed plate (301) and its top end penetrating the base plate (1) and connected to the first guide assembly. The material ejection mechanism (4) is configured such that the second nitrogen spring (401) drives the transmission assembly (403) through the fixed plate (301), thereby causing the first guide assembly to move in the direction of movement of the transmission assembly (403).

13. The die for stamping negative angle flanges according to claim 12, characterized in that, The mold also includes a second guide component (5), which is located below the fixed plate (301) and has its top end passing through the fixed plate (301) to limit the movement of the ejector mechanism (4) in the direction of the second nitrogen spring (401) rising or falling.

14. The die for stamping negative angle flanges according to claim 1, characterized in that, The mold also includes a positioning detection mechanism (6), which is located on the base plate (1) and is configured to detect whether the connecting rod assembly (303) has moved to the positioning position.

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