A stamping die

Abstract

The utility model provides a kind of stamping die, it includes: upper die assembly, including die and upper die holder, die is fixed on upper die holder, pre-pressing pin and stripper pin are embedded on die;Lower die assembly, including punch, pressure ring and lower die holder, punch is embedded in lower die holder, pressure ring is vertically movably set on lower die holder and is peripherally set in the outer periphery of punch, the bottom of pressure ring is connected with lower die holder by nitrogen spring, the working surface of pressure ring is inclined surface;When opening, pressure ring is lifted under the action of nitrogen spring, so that the working surface of pressure ring is higher than punch;Positioning assembly, vertically telescopicly set on the working surface of pressure ring, and can be retracted into pressure ring before sheet metal stamping forming, and, in the opening process after sheet metal stamping forming, extend pressure ring and rest against sheet metal edge, to make workpiece realize positioning in horizontal direction.The utility model has the advantages of preventing workpiece from slipping along pressure ring inclined surface in opening process, ensuring workpiece positioning accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of stamping processing technology, and specifically relates to a stamping die. Background Technology

[0002] In the field of stamping, to ensure the stability of the workpiece during the mold opening process and avoid problems such as jumping or displacement caused by instantaneous release from the mold constraint, existing technologies generally adopt a structure with elastic ejector pins inside the mold. The elastic ejector pin is usually installed at a corresponding position in the die cavity. During mold closing and stamping, it contracts under pressure to become flush with the working surface of the mold, without affecting the workpiece forming process. When the mold opens, the elastic ejector pin resets and ejects under its own elastic force, applying a continuous and uniform supporting force to the workpiece. This effectively counteracts the inertial force when the workpiece leaves the mold, thus preventing disorderly jumping or positional displacement of the workpiece and providing the basic conditions for subsequent material handling processes.

[0003] However, the aforementioned method of preventing displacement solely by relying on elastic ejector pins has significant drawbacks when stamping workpieces with inclined surfaces. Specifically, after forming, such workpieces are pushed by the blank holder to the surface of the punch, which is detached from the lower die. At this point, the workpiece's supporting surface is the inclined working surface of the blank holder. Due to the workpiece's own weight and the fact that the pushing force of the elastic ejector pin is usually perpendicular to the punch surface and does not match the inclined surface of the blank holder, an effective lateral constraint cannot be formed. This causes the workpiece to slip to one side along the inclined working surface of the blank holder under the combined action of its own weight and the pushing force of the ejector pin. This slippage causes the workpiece to deviate from the preset pick-up position. The precision transfer equipment (such as industrial robots) used to grasp the workpiece controls its grasping action based on preset workpiece position parameters. The slippage of the workpiece prevents the equipment from accurately grasping it, reducing production efficiency and potentially causing workpiece damage or equipment failure due to grasping deviations, severely affecting the continuity and stability of stamping production.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0005] The purpose of this invention is to provide a stamping die that has the advantages of preventing the workpiece from sliding along the inclined surface of the pressure ring during the die opening process and ensuring the positioning accuracy of the workpiece.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A stamping die, characterized in that it comprises: an upper die assembly, a lower die assembly, and a positioning assembly. The upper die assembly includes a die cavity and an upper die base. The die cavity is fixed on the upper die base. A pre-pressing pin and a stripper pin are embedded in the die cavity. The pre-pressing pin acts on the edge of the sheet metal, and the stripper pin acts on the middle of the sheet metal. The stroke of the pre-pressing pin is greater than the stroke of the stripper pin, and the force of the pre-pressing pin is less than the force of the stripper pin. The lower die assembly includes a punch, a blank holder, and a lower die base. The punch is fixed on the lower die base, and the blank holder is vertically movable. The blank holder is mounted on the lower die base and surrounds the outer periphery of the punch. The bottom of the blank holder is connected to the lower die base via a nitrogen spring. The working surface of the blank holder is an inclined surface. When the die is opened, the blank holder is lifted up by the nitrogen spring, so that the working surface of the blank holder is higher than the punch. The positioning component is vertically telescopically mounted on the working surface of the blank holder. It can retract into the blank holder before the sheet metal is stamped and can extend the blank holder and abut against the edge of the sheet metal during the die opening process after the sheet metal is stamped, so that the workpiece is positioned in the horizontal direction.

[0008] As a preferred embodiment of this utility model, before the sheet metal is stamped, the positioning component is covered by the sheet metal and retracts into the pressure ring under the gravity of the sheet metal.

[0009] As a preferred embodiment of this utility model, the positioning components are provided in multiple ways and are arranged on both sides of the working surface of the pressure ring in the inclined direction.

[0010] As a preferred embodiment of this utility model, the positioning component includes a positioning post and an elastic element. The working surface of the pressure ring is provided with a mounting hole. Both the positioning post and the elastic element are disposed in the mounting hole. The upper end of the elastic element abuts against the positioning post, and the lower end of the elastic element abuts against the inner bottom of the mounting hole. The positioning post protrudes from the working surface of the pressure ring under the elastic force of the elastic element. The mounting hole is a stepped hole with a larger upper diameter and a smaller lower diameter. The outer diameter of the positioning post matches the upper diameter of the stepped hole. The outer periphery of the positioning post is provided with a radially protruding limiting part, which can abut against the annular stepped surface of the stepped hole.

[0011] As a preferred embodiment of the present invention, the positioning component further includes a mounting sleeve, which is threaded into the mounting hole and forms an inner bottom that abuts against the lower end of the elastic element.

[0012] As a preferred embodiment of the present invention, the stamping die further includes a plurality of edge-stopping components arranged around the sheet metal before stamping, the edge-stopping components being mounted on the pressure ring and used to abut the edge of the sheet metal.

[0013] As a preferred embodiment of this utility model, the edge-blocking assembly includes an edge-blocking plate and a guide base. The pressure ring is provided with a guide groove that slides with the guide base. The guide base is provided with a strip-shaped hole, and a bolt passes through the strip-shaped hole to lock the guide base onto the pressure ring. The edge-blocking plate is arranged vertically, and the lower end of the edge-blocking plate is fixedly connected to the guide base. The surface of the edge-blocking plate near the sheet metal forms a positioning reference surface that abuts against the edge of the sheet metal. The upper end of the positioning reference surface is connected to a guide slope or a guide arc surface.

[0014] As a preferred embodiment of this utility model, among the plurality of edge-blocking assemblies, at least one edge-blocking assembly is provided with a lever plate and a sensor. The lever plate is rotatably connected to the side adjacent to the positioning reference surface of the edge-blocking plate via a rotating shaft. The working surface of the lever plate protrudes from the positioning reference surface of the edge-blocking plate in a free state. A guide slope or guide arc surface is connected to the upper end of the working surface of the lever plate. When the sheet material is placed, the lever plate is pressed to rotate toward the side away from the sheet material. The sensor is installed on the guide base and located on the side of the lever plate away from the sheet material. The sensor is used to detect the rotational displacement of the lever plate.

[0015] As a preferred embodiment of this utility model, a first guide structure is provided between the pressure ring and the lower die base. The first guide structure includes inner right-angle vertical grooves disposed at the four corners of the pressure ring and rectangular columns disposed at the four corners of the lower die base. The inner right-angle vertical grooves and the rectangular columns are slidably engaged. A first wear-resistant plate is provided on the contact surfaces of the inner right-angle vertical grooves and the rectangular columns respectively. A second guide structure is provided between the pressure ring and the upper die base. The second guide structure includes rectangular vertical grooves disposed on both sides of the working surface of the pressure ring in the inclined direction and rectangular guide plates disposed on both sides of the upper die base. The rectangular vertical grooves and the rectangular guide plates are slidably engaged. A second wear-resistant plate is provided on the contact surfaces of the rectangular vertical grooves and the rectangular guide plates respectively.

[0016] As a preferred embodiment of this utility model, the pressure ring is fixedly provided with a first lateral guide block on the lower side of its working surface in the inclined direction to resist the lateral force caused by the inclined surface during mold closing. The vertical surface of the first lateral guide block facing the working surface of the pressure ring is the first abutting surface. The upper mold base is fixedly provided with a second lateral guide block, which has a second abutting surface that abuts against the first abutting surface of the first lateral guide block. A third wear-resistant plate is provided on the first abutting surface and the second abutting surface respectively.

[0017] The advantages of implementing the stamping die provided by this utility model compared with the prior art are as follows:

[0018] This utility model embodiment uses a positioning component to extend a pressure ring and abut against the edge of the sheet metal during the mold opening process after the sheet metal is stamped, thereby achieving horizontal positioning and effectively preventing the workpiece from sliding along the inclined surface. It has the advantages of high positioning accuracy and good part removal stability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0020] Figure 1 This is an isometric schematic diagram of the stamping die provided in this embodiment of the utility model;

[0021] Figure 2 This is a longitudinal sectional view of the stamping die provided in this embodiment of the utility model;

[0022] Figure 3 This is an isometric schematic diagram of the lower mold assembly and the positions of the pre-compression pin and the unloading pin.

[0023] Figure 4 This is a cross-sectional view of the lower mold assembly;

[0024] Figure 5 It is at Figure 4 A magnified view of region A in the structure shown;

[0025] Figure 6 It is at Figure 3 A magnified view of region B in the structure shown;

[0026] Marked in the image:

[0027] Upper mold assembly 10; Cavity mold 11; Upper mold base 12; Rectangular guide plate 121; Pre-compression pin 13; Ejector pin 14;

[0028] Lower mold assembly 20; punch 21; pressure ring 22; pressure ring working surface 221; mounting hole 222; annular stepped surface 223; inner right-angle vertical groove 224; rectangular vertical groove 225; lower mold base 23; rectangular column 231; nitrogen spring 24; first wear-resistant plate 25; second wear-resistant plate 26; first lateral guide block 27; third wear-resistant plate 28;

[0029] Positioning component 30; positioning post 31; elastic element 32; mounting sleeve 33; limiting part 34; slot 35;

[0030] Side guard assembly 40; side guard plate 41; guide base 42; guide groove 43; strip hole 44; dial plate 45; sensor 46; rotating shaft 47. Detailed Implementation

[0031] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this utility model, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] like Figures 1 to 6 As shown, this utility model embodiment proposes a stamping die, including an upper die assembly 10, a lower die assembly 20, and a positioning assembly 30. The upper die assembly 10 includes a die cavity 11 and an upper die base 12. The die cavity 11 is fixed to the upper die base 12. A pre-pressing pin 13 and a stripper pin 14 are embedded in the die cavity 11. The pre-pressing pin 13 acts on the edge of the sheet metal, and the stripper pin 14 acts on the middle of the sheet metal. The stroke of the pre-pressing pin 13 is greater than the stroke of the stripper pin 14, and the force of the pre-pressing pin 13 is less than the force of the stripper pin 14. The lower die assembly 20 includes a punch 21, a blank holder 22, and a lower die base 23. The punch 21 is fixed to the lower die base 23, and the blank holder 22 is vertically movable and disposed on the lower die base 23, surrounding the punch 21. The bottom of the pressure ring 22 is connected to the lower die base 23 via a nitrogen spring 24 on the outer periphery of the die 1. The working surface 221 of the pressure ring 22 is an inclined surface. When the die is opened, the pressure ring 22 is lifted up by the nitrogen spring 24, so that the working surface 221 of the pressure ring 22 is higher than the punch 21. The positioning component 30 is vertically telescopically set on the working surface 221 of the pressure ring 22. It can be retracted into the pressure ring 22 before the sheet metal is stamped and formed, and can extend the pressure ring 22 and abut against the edge of the sheet metal during the die opening process after the sheet metal is stamped and formed, so that the workpiece is positioned in the horizontal direction.

[0033] It is understandable that the pre-pressure pin 13 refers to an elastic ejector device located in the edge area of ​​the die cavity 11, specifically a spring ejector pin, used to apply continuous pre-pressure to the edge of the workpiece during the initial mold opening stage. The ejector pin 14 refers to an elastic ejector device located in the middle area of ​​the die cavity 11, specifically a high-stiffness spring ejector pin, used to quickly detach from the center area of ​​the workpiece. The pressure ring 22 refers to an annular component located on the lower die base 23 and surrounding the outer periphery of the punch 21, specifically driven vertically by a nitrogen spring 24 to lift the workpiece during mold opening. The pressure ring working surface 221 being inclined means that the supporting surface forms an inclination angle with the horizontal plane, specifically a 15-30 degree inclination angle, used to form an inclined support reference surface during mold opening. The vertically extendable positioning component 30 refers to a limiting mechanism with automatic lifting function, specifically a spring return plunger structure composed of elastic elements and positioning pins, used to form a horizontal mechanical limit during the mold opening stage.

[0034] Specifically, during the die-closing and stamping stage, the positioning component 30 is retracted by the pressure ring 22 to avoid interfering with the forming of the sheet metal. When the die opens, the nitrogen spring 24 drives the pressure ring 22 to rise, making the working surface 221 of the pressure ring higher than the punch 21 to form a support reference. The stripper pin 14 quickly disengages from the center of the workpiece with a large force, while the pre-pressing pin 13 continuously presses the edge of the workpiece with a smaller force, ensuring that the workpiece smoothly transitions to the support state of the pressure ring 22. At the same time, the positioning component 30 automatically extends out of the working surface 221 of the pressure ring under the action of the elastic element, forming a horizontal constraint on the edge of the workpiece. The inclined support surface and the horizontal limiting component work together to allow the workpiece to be freely demolded in the vertical direction while effectively counteracting the lateral force generated by its own weight.

[0035] Compared to existing technologies, traditional solutions only use vertical ejector pins to prevent workpiece jumping, failing to address lateral slippage caused by inclined supports. This solution innovatively incorporates a dynamic positioning component 30 on the inclined surface of the pressure ring 22. Through the spatial coordination of mechanical limiting and inclined support, a three-dimensional constraint system is formed. Simultaneously, a staged pressure application design using pre-pressing pins 13 and unloading pins 14 ensures smooth workpiece release from the die 11 while preventing secondary displacement caused by excessive ejection force.

[0036] Through the above technical solution, this embodiment of the invention effectively prevents the lateral slippage of the inclined workpiece during the mold opening stage, ensuring the workpiece remains stably in the preset position. The positioning component 30 automatically hides during the stamping stage and precisely pops out during the demolding stage, achieving reliable positioning without affecting the forming accuracy. This structure significantly improves the positioning success rate of the gripping equipment and ensures the stability of continuous production.

[0037] For example, in this embodiment of the present invention, the positioning component 30 is covered by the sheet metal and retracts into the pressure ring 22 under the gravity of the sheet metal before the sheet metal is stamped.

[0038] Understandably, in the initial stage of the stamping process, when the sheet metal is placed on the working surface 221 of the blank holder, its edge area directly covers the positioning component 30. The weight of the sheet metal itself is transferred to the top of the positioning post through the contact surface, forcing the positioning post to overcome the elastic force of the elastic element below and move downward until the top of the positioning post is flush with the working surface 221 of the blank holder. This action eliminates the rigid obstruction of the positioning component 30 to the placement of the sheet metal, ensuring that the sheet metal can be accurately positioned without interference. During the stamping process, the positioning component 30 remains in a retracted state to avoid collision with the forming die. When the stamping is completed and the die opening stage begins, the sheet metal has been formed into a workpiece and the gravity constraint is released. The restoring force of the elastic element pushes the positioning post upward out of the working surface 221 of the blank holder, forming a horizontal limit on the edge of the workpiece and preventing the workpiece from sliding along the inclined surface. Therefore, this embodiment of the invention achieves the adaptive movement of the positioning component 30 through the mechanical linkage of the sheet metal's own weight and the elastic element, without the need for manual intervention or an additional drive system. This solves the interference problem between the positioning component 30 and the sheet metal placement action, and realizes the automatic avoidance and resetting of the positioning component 30 during the stamping process. During the mold opening stage, the horizontal constraint of the positioning component 30 on the workpiece effectively counteracts the tendency of the workpiece to slide along the inclined surface of the pressure ring 22, ensuring that the workpiece stays at the preset picking position, providing a stable positioning reference for the automated gripping equipment.

[0039] For example, in this embodiment of the present invention, a plurality of positioning components 30 are provided and arranged on both sides of the working surface 221 of the pressure ring 22 in the inclined direction.

[0040] It is understood that multiple positioning components 30 refer to a number of no less than four positioning units, specifically arranged according to the edge position of the sheet metal after forming. At least two positioning components 30 are set on each side, forming symmetrical constraints through multi-point contact. Arrangement on both sides of the inclined direction means that they are distributed at equal or unequal intervals along the high and low sides of the inclined working surface of the pressure ring 22, ensuring force balance in the high and low areas of the inclined surface. When the workpiece detaches from the surface of the punch 21, the positioning components 30 on both sides extend synchronously and abut against the edge of the workpiece. Since there are different lateral forces in the high and low areas of the inclined surface, the positioning components 30 distributed on both sides can apply corresponding constraint forces to the high and low sides respectively, forming a bidirectional balance. Therefore, this embodiment of the invention, through the symmetrical constraints formed by the positioning components 30 distributed on both sides, can simultaneously act on the lateral forces in different areas of the inclined surface, achieving bidirectional balanced positioning of the workpiece on the inclined working surface, ensuring the horizontal positional stability of the workpiece after mold opening, and providing a precise positioning reference for subsequent automated gripping processes.

[0041] For example, the present invention further proposes that the positioning component 30 includes a positioning post 31 and an elastic element 32. The working surface 221 of the pressure ring 22 is provided with a mounting hole 222. The positioning post 31 and the elastic element 32 are both disposed in the mounting hole 222. The upper end of the elastic element 32 abuts against the positioning post 31, and the lower end of the elastic element 32 abuts against the inner bottom of the mounting hole 222. The positioning post 31 protrudes out of the working surface 221 of the pressure ring 22 under the elastic force of the elastic element 32.

[0042] It is understood that the positioning pin 31 refers to a rigid component with a cylindrical structure, which can be made of metal and is used to extend out of the working surface 221 of the blank holder during the mold opening stage to prevent workpiece slippage. The elastic element 32 refers to a mechanical component capable of storing elastic potential energy, which can be implemented using a helical spring, and is used to provide an upward ejection force for the positioning pin 31. The mounting hole 222 refers to a through hole or blind hole structure opened on the working surface 221 of the blank holder, used to accommodate the positioning pin 31 and the elastic element 32 and limit their range of motion. The inner bottom refers to the support surface formed at the bottom of the mounting hole 222, which can be formed by a threaded mounting sleeve, and is used to provide a fixed fulcrum for the elastic element 32. During the stamping stage, the sheet metal covers the working surface 221 of the blank holder, and its gravity presses the positioning pin 31 to overcome the elastic force of the elastic element 32 and retract into the mounting hole 222, preventing the positioning pin 31 from interfering with the forming process. Furthermore, the plastic deformation of the sheet metal pulls the edge material towards the central region, causing the positioning component 30 to break free from the sheet metal constraint. During mold opening, the elastic element 32 releases its elastic force, pushing the positioning post 31 upwards out of the working surface. At this time, the top of the positioning post 31 forms a rigid block against the edge of the workpiece. The inner wall of the mounting hole 222 guides the lifting and lowering movement of the positioning post 31, ensuring that the positioning post 31 always moves in the vertical direction and avoids jamming due to skewness. Thus, this embodiment of the invention, through the elastically supported positioning post 31 automatically protruding out of the working surface 221 of the pressure ring during the mold opening stage, directly blocks the edge of the workpiece, forming a rigid limit in the horizontal direction, offsetting the lateral force generated by the workpiece's own weight, and solving the problem of positioning failure caused by the workpiece sliding along the inclined surface of the pressure ring 22 during mold opening, realizes automatic horizontal positioning of the workpiece after stamping.

[0043] For example, in this embodiment of the present invention, the positioning component 30 further includes a mounting sleeve 33, which is threaded into the mounting hole 222 and forms an inner bottom that abuts against the lower end of the elastic element 32.

[0044] It is understood that the mounting sleeve 33 refers to a metal part with external threads, whose external threads and the internal threads of the mounting hole 222 form an adjustable axial positioning structure. After the mounting sleeve 33 is screwed into the mounting hole 222, its top surface forms a rigid plane supporting the elastic element 32. When it is necessary to adjust the preload of the elastic element 32, its axial position within the mounting hole 222 can be changed by rotating the mounting sleeve 33, thereby adjusting the degree of compression of the elastic element 32. Thus, in this embodiment of the invention, the threaded mounting sleeve 33 achieves both stable contact of the lower end of the elastic element 32 and adjustment of the preload of the elastic element 32.

[0045] In some specific embodiments, the mounting sleeve 33 is provided with a slot 35 that can accommodate the elastic element 32 and allow the positioning post 31 to be inserted. The slot 35 refers to a cavity structure set inside the mounting sleeve 33, which can be implemented as a cylindrical blind hole. Its inner diameter matches the outer diameter of the elastic element 32 and the outer diameter of the positioning post 31, and is used to constrain the radial displacement of the elastic element 32 and provide an axial guide channel for the telescopic movement of the positioning post 31.

[0046] For example, in this embodiment of the present invention, the mounting hole 222 is a stepped hole with a small upper diameter and a large lower diameter. The outer diameter of the positioning post 31 matches the upper diameter of the stepped hole. The outer periphery of the positioning post 31 is provided with a radially protruding limiting part 34, which can abut against the annular step surface 223 of the stepped hole.

[0047] It is understood that a stepped hole refers to a hole structure with a diameter that varies along the axial direction, where the upper section has a smaller diameter than the lower section, forming an annular stepped surface 223 between the two sections. This structure provides axial guidance space for the positioning post 31 and simultaneously forms a mechanical limiting boundary through the stepped surface 27. The limiting part 34 refers to an annular protrusion extending outward from the outer peripheral surface of the positioning post 31. This annular protrusion contacts the annular stepped surface 223 during the rising of the positioning post 31, preventing the positioning post 31 from disengaging from the mounting hole 222. Specifically, when the mold is opened, the elastic element 32 pushes the positioning post 31 upward, and the limiting part 34 moves upward accordingly. When the top of the positioning post 31 extends beyond the working surface 221 of the pressure ring to a set height, the limiting part 34 contacts the stepped surface 27 to form a rigid stop, preventing the elastic element 32 from excessively rebounding and causing the positioning post 31 to disengage.

[0048] For example, in this embodiment of the present invention, the positioning post 31 protrudes from the working surface of the pressure ring 22 at a height greater than the thickness of the sheet material under the elastic force of the elastic element 32.

[0049] It is understandable that the protrusion height of the positioning post 31 refers to the vertical distance between the top of the positioning post 31 and the working surface 221 of the pressure ring when the elastic element 32 is in a free state. This can be achieved by adjusting the height of the mounting sleeve 33 or the length of the positioning post 31. When the elastic element 32 releases its elastic force, pushing the positioning post 31 upwards, its protrusion height exceeds the thickness of the sheet metal, allowing the top of the positioning post 31 to reliably abut against the edge of the sheet metal. The penetrating positioning post 31 forms a rigid vertical blocking surface, constraining the horizontal degree of freedom of the workpiece after it leaves the punch 21, effectively suppressing the tendency of the workpiece to slide along the inclined surface of the pressure ring 22.

[0050] For example, this utility model embodiment further proposes to install a plurality of edge-blocking components 40 arranged around the perimeter of the sheet metal before stamping on the pressure ring 22, the edge-blocking components 40 being used to abut the edge of the sheet metal.

[0051] It is understood that the edge-stop assembly 40 refers to a device that forms a horizontal constraint on the edge of the sheet metal through a rigid structure. Specifically, it can be implemented using a combination structure of an edge-stop plate and a guide base. The positioning reference surface of the edge-stop plate directly contacts the edge of the sheet metal to limit lateral displacement. Specifically, before stamping, the sheet metal is placed on the inclined surface of the blank holder 22. At this time, the edge-stop assembly 40 forms a rigid barrier on the edge of the sheet metal from all sides. When the sheet metal tends to slip laterally due to its own weight or external forces, the positioning reference surface of the edge-stop plate limits its displacement through physical contact. Multiple edge-stop assemblies 40 are evenly distributed around the circumference of the blank holder 22, covering different areas of the edge of the sheet metal to ensure the uniformity of the constraint force. During the stamping process, the blank holder 22 and the edge-stop assembly 40 work together. The blank holder 22 supports the sheet metal through the inclined surface, and the edge-stop assembly 40 counteracts the component force of the sheet metal along the inclined surface by lateral limiting, thereby maintaining the positional stability of the sheet metal in the horizontal direction. Therefore, by adding the edge-stopping component 40, the present invention forms a rigid constraint in the horizontal direction, directly blocking the displacement path of the sheet material along the inclined surface of the pressure ring 22. This effectively prevents the sheet material from shifting laterally due to its own weight or external interference before stamping, ensuring that the sheet material is always in the preset position and improving the forming accuracy.

[0052] In some specific embodiments, the edge guard assembly 40 includes an edge guard plate 41 and a guide base 42. The pressure ring 22 has a guide groove 43 that slides with the guide base 42. The guide base 42 has a slotted hole 44, through which bolts pass to lock the guide base 42 onto the pressure ring 22. The edge guard plate 41 is vertically arranged, and its lower end is fixedly connected to the guide base 42. The surface of the edge guard plate 41 near the sheet metal forms a positioning reference surface that abuts against the edge of the sheet metal. The upper end of the positioning reference surface is connected to a guide slope or a guide arc surface. This design allows the operator to adjust the position of the edge guard assembly 40 according to the size of different sheet metals to obtain the best positioning effect.

[0053] Furthermore, among the multiple edge-guarding assemblies 40, at least one edge-guarding assembly 40 is equipped with a lever 45 and a sensor 46. The lever 45 is rotatably connected to the side adjacent to the positioning reference surface of the edge-guarding plate 41 via a rotating shaft 47. The working surface of the lever 45 protrudes from the positioning reference surface of the edge-guarding plate 41 in its free state, and a guide slope or guide arc surface is connected to the upper end of the working surface of the lever 45. When the sheet material is placed, the lever 45 is pressed to rotate away from the sheet material. The sensor 46 is mounted on the guide base 42 and located on the side of the lever 45 away from the sheet material. The sensor 46 is used to detect the rotational displacement of the lever 45. Thus, when the edge of the sheet material presses against the working surface of the lever 45, the lever 45 rotates around the rotating shaft 47 away from the sheet material and approaches the sensor 46. The sensor 46 (such as an inductive proximity switch) outputs a high-level signal, sending a "sheet material in place" signal. Thus, the arrangement of the lever 45 and the sensor 46 provides a mechanism for automatically detecting whether the sheet material is correctly placed. This design can promptly detect sheet metal placement errors, preventing stamping failures or mold damage caused by improper sheet metal positioning. Automated inspection improves production efficiency and safety while reducing human error.

[0054] For example, this utility model embodiment further proposes a first guide structure between the pressure ring 22 and the lower mold base 23. The first guide structure includes an inner right-angle vertical groove 224 disposed at the four corners of the pressure ring 22 and a rectangular column 231 disposed at the four corners of the lower mold base 23. The inner right-angle vertical groove 224 and the rectangular column 231 are slidably engaged. A first wear-resistant plate 25 is respectively disposed on the contact surface of the inner right-angle vertical groove 224 and the rectangular column 231. A second guide structure is provided between the pressure ring 22 and the upper mold base 12. The second guide structure includes a rectangular vertical groove 225 disposed on both sides of the working surface 221 of the pressure ring in the inclined direction and a rectangular guide plate 121 disposed on both sides of the upper mold base 12. The rectangular vertical groove 225 and the rectangular guide plate 121 are slidably engaged. A second wear-resistant plate 26 is respectively disposed on the contact surface of the rectangular vertical groove 225 and the rectangular guide plate 121.

[0055] Understandably, the sliding fit between the inner right-angle vertical groove 224 and the rectangular column 231 constrains the pure linear movement of the pressure ring 22 in the vertical direction, eliminating the risk of deflection during mold opening and closing. Similarly, the sliding fit between the rectangular vertical groove 225 and the rectangular guide plate 121 constrains the pure linear movement of the upper mold base 12 in the vertical direction, eliminating the risk of deflection during mold opening and closing. Using wear-resistant plates extends the service life of the guide structure and reduces maintenance frequency. This design improves the overall working accuracy and reliability of the mold, contributing to higher quality stamping.

[0056] For example, in this embodiment of the present invention, a first lateral guide block 27 is fixed on the lower side of the working surface of the pressure ring 22 to resist the lateral force caused by the inclined surface during mold closing. The vertical surface of the first lateral guide block 27 facing the working surface of the pressure ring 22 is the first abutting surface. The upper mold base 12 is fixed with a second lateral guide block, which has a second abutting surface that abuts against the first abutting surface of the first lateral guide block 27. A third wear-resistant plate 28 is provided on the first abutting surface and the second abutting surface, respectively.

[0057] Understandably, the lateral guide block effectively counteracts the lateral force generated during mold closing due to the inclined surface of the blank holder 221. This design enhances mold stability and prevents lateral displacement of the blank holder 22 during mold closing, thus ensuring the accuracy and consistency of the stamping process. Using wear-resistant plates can extend the service life of the guide block and reduce maintenance requirements.

[0058] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A stamping die, characterized in that, include: The upper mold assembly includes a die cavity and an upper mold base. The die cavity is fixed on the upper mold base. A pre-pressing pin and a stripper pin are embedded in the die cavity. The pre-pressing pin acts on the edge of the sheet metal, and the stripper pin acts on the middle of the sheet metal. The stroke of the pre-pressing pin is greater than the stroke of the stripper pin, and the force of the pre-pressing pin is less than the force of the stripper pin. The lower die assembly includes a punch, a pressure ring, and a lower die base. The punch is fixedly embedded in the lower die base. The pressure ring is vertically movable and disposed on the lower die base, surrounding the outer periphery of the punch. The bottom of the pressure ring is connected to the lower die base via a nitrogen spring. The working surface of the pressure ring is an inclined surface. When the die is opened, the pressure ring is lifted up by the nitrogen spring, so that the working surface of the pressure ring is higher than the punch. A positioning component is provided, which can be vertically telescopically disposed on the working surface of the pressure ring, and can be retracted into the pressure ring before the sheet metal is stamped, and can extend the pressure ring and abut against the edge of the sheet metal during the mold opening process after the sheet metal is stamped, so as to position the workpiece in the horizontal direction.

2. The stamping die as described in claim 1, characterized in that, Before the sheet metal is stamped, the positioning component is covered by the sheet metal and retracts into the pressure ring under the weight of the sheet metal.

3. The stamping die as described in claim 2, characterized in that, The positioning components are provided in multiple parts and are arranged on both sides of the inclined direction of the working surface of the pressure ring.

4. The stamping die as described in claim 3, characterized in that, The positioning assembly includes a positioning post and an elastic element. The working surface of the pressure ring has a mounting hole. Both the positioning post and the elastic element are disposed in the mounting hole. The upper end of the elastic element abuts against the positioning post, and the lower end of the elastic element abuts against the inner bottom of the mounting hole. The positioning post protrudes from the working surface of the pressure ring under the elastic force of the elastic element. The mounting hole is a stepped hole with a larger upper diameter and a smaller lower diameter. The outer diameter of the positioning post matches the upper diameter of the stepped hole. The outer periphery of the positioning post has a radially protruding limiting part that can abut against the annular stepped surface of the stepped hole.

5. The stamping die as described in claim 4, characterized in that, The positioning assembly also includes a mounting sleeve, which is threaded into the mounting hole and forms an inner bottom that abuts against the lower end of the elastic element.

6. The stamping die according to any one of claims 1 to 5, characterized in that, It also includes multiple edge-stopping assemblies arranged around the sheet metal before stamping, the edge-stopping assemblies being mounted on the pressure ring to abut the edge of the sheet metal.

7. The stamping die as described in claim 6, characterized in that, The edge retaining assembly includes an edge retaining plate and a guide base. The pressure ring has a guide groove that slides with the guide base. The guide base has a strip hole, and a bolt passes through the strip hole to lock the guide base onto the pressure ring. The edge retaining plate is arranged vertically, and its lower end is fixedly connected to the guide base. The surface of the edge retaining plate near the sheet metal forms a positioning reference surface that abuts against the edge of the sheet metal. The upper end of the positioning reference surface is connected to a guide slope or a guide arc surface.

8. The stamping die as described in claim 7, characterized in that, In the plurality of edge-blocking assemblies, at least one edge-blocking assembly is provided with a lever and a sensor. The lever is rotatably connected to the side adjacent to the positioning reference surface of the edge-blocking plate via a rotating shaft. The working surface of the lever protrudes from the positioning reference surface of the edge-blocking plate in a free state. A guide slope or guide arc surface is connected to the upper end of the working surface of the lever. When the sheet is placed, the lever is pressed to rotate toward the side away from the sheet. The sensor is installed on the guide base and located on the side of the lever away from the sheet. The sensor is used to detect the rotational displacement of the lever.

9. The stamping die as described in claim 1, characterized in that, A first guide structure is provided between the pressure ring and the lower die base. The first guide structure includes inner right-angle vertical grooves at the four corners of the pressure ring and rectangular columns at the four corners of the lower die base. The inner right-angle vertical grooves and the rectangular columns are slidably engaged. A first wear-resistant plate is provided on the contact surfaces of the inner right-angle vertical grooves and the rectangular columns respectively. A second guide structure is provided between the pressure ring and the upper die base. The second guide structure includes rectangular vertical grooves on both sides of the working surface of the pressure ring in the inclined direction and rectangular guide plates on both sides of the upper die base. The rectangular vertical grooves and the rectangular guide plates are slidably engaged. A second wear-resistant plate is provided on the contact surfaces of the rectangular vertical grooves and the rectangular guide plates respectively.

10. The stamping die as described in claim 1, characterized in that, The pressure ring has a first lateral guide block fixed on its lower side in the inclined direction of its working surface to resist the lateral force caused by the inclined surface when the mold is closed. The vertical surface of the first lateral guide block facing the working surface of the pressure ring is the first abutting surface. The upper mold base has a second lateral guide block fixed on it. The second lateral guide block has a second abutting surface that abuts against the first abutting surface of the first lateral guide block. A third wear-resistant plate is provided on the first abutting surface and the second abutting surface respectively.

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