A metal sheet stamping device for wiring terminals

Abstract

This utility model relates to the field of precision machining equipment technology, specifically to a stamping device for terminal metal sheets, including a base and a mold changing device. The base has a worktable with a lower mold base and multiple symmetrically distributed positioning holes. The lower mold base has three equidistantly distributed lower dies. The mold changing device includes a threaded rod rotatably mounted inside the worktable, a threaded block mounted on the lower mold base, a guide block mounted on the threaded block, four fixing plates symmetrically distributed on the lower mold base, and a fixing assembly mounted on the fixing plates. The fixing assembly includes a frame mounted on the fixing plate, a pin slidably connected to the frame and having two through holes, a convex ring coaxially mounted on the pin, a first spring with its two ends respectively mounted on the convex ring and the frame, and a pin penetrating the through holes. This utility model allows for quick replacement of the lower dies to stamp different types of terminal metal sheets, improving the ease of operation of the device.

Description

Technical Field

[0001] This utility model relates to the field of precision machining equipment technology, specifically to a metal sheet stamping device for wiring terminals. Background Technology

[0002] Terminal blocks, as key components in the field of electrical connections, typically consist of an insulating plastic shell and a metal conductive sheet. The metal sheet needs to be processed into a specific shape (such as a structure with wiring holes and fastening grooves) through a stamping process to meet the core functions of wire insertion, screw fastening, and current conduction. In the mass production of terminal blocks, the stamping device is the core equipment for achieving efficient metal sheet forming, and its performance directly affects product accuracy, production efficiency, and changeover flexibility.

[0003] Existing terminal block metal sheet stamping devices mostly adopt a fixed structure of "single lower die and single upper die," or although multiple sets of dies are set, they lack a convenient die-changing mechanism. Chinese Patent No. CN209156817U discloses a current transformer core terminal block stamping device. This device uses a hydraulic cylinder to drive the punch downwards, and a gravity sensor detects the pressure value to adjust the stamping parameters. While this can improve stamping quality to some extent, it has significant drawbacks when dealing with the production needs of different types of terminal block metal sheets: replacing the lower die requires disassembling multiple fastening bolts, removing the old die, and then aligning and installing the new die. The entire process is cumbersome and time-consuming. Furthermore, after reinstallation, the die alignment accuracy needs to be repeatedly calibrated, which is prone to errors due to manual operation. Errors in stamping processes not only reduce the ease of use of equipment but also severely impact production efficiency in scenarios involving multiple product types and small batches. Furthermore, some existing devices use an integrated or multi-bolt rigid connection design between the upper die holder and the lifting seat, requiring the disassembly of numerous connecting parts when changing the upper die, further increasing changeover costs. Simultaneously, the metal sheet is prone to displacement during stamping due to the lack of a pre-fixed structure, leading to dimensional deviations and hole misalignments in the formed metal sheet, affecting the assembly accuracy and conductivity stability of the terminal blocks. Therefore, the shortcomings of existing terminal block metal sheet stamping devices in terms of ease of die change, die calibration efficiency, and workpiece positioning stability have severely restricted the flexibility of terminal block production and product quality. Utility Model Content

[0004] The purpose of this utility model is to provide a metal sheet stamping device for wiring terminals that can achieve rapid mold changing, precise positioning, and convenient operation.

[0005] This utility model is achieved through the following technical solution: a metal sheet stamping device for wiring terminals, comprising: The base has a worktable fixedly mounted on its top; the worktable slides on the top of the lower die base and has multiple positioning holes symmetrically distributed along the sliding direction of the lower die base; the lower die base has three lower dies fixedly mounted on its top, which are equidistantly distributed along the horizontal direction, and the three lower dies are respectively adapted to the stamping and forming requirements of different types of terminal metal sheets. A die-changing device is provided to drive the lower die holder to slide and position on a worktable to switch between different lower dies at the stamping station. The device includes a threaded rod, a threaded block, a guide block, four fixing plates, and a fixing assembly. The threaded rod is rotatably mounted in a mounting cavity inside the worktable via bearings, and the axis of the threaded rod is aligned with the sliding direction of the lower die holder. The threaded block is fixedly mounted at the bottom of the lower die holder and threadedly engaged with the threaded rod. The guide block is fixedly mounted on the side of the threaded block and slidably embedded in a guide groove inside the worktable, the extension direction of which is aligned with the axis of the threaded rod. The four fixing plates are respectively fixedly mounted at the four corners of the bottom of the lower die holder, and are symmetrically distributed. Each of the fixed plates is provided with a set of fixing components; the fixing components include a frame, a pin, a convex ring, a first spring, and a pin; the frame is fixedly disposed on the side of the fixed plate away from the center of the lower mold base; the pin slides horizontally through the frame and the fixed plate, and one end of the pin can be adapted to be inserted into the positioning hole on the worktable, and two through holes for the pin to pass through are opened at intervals along its axis on the pin; the convex ring is coaxially fixedly sleeved on the section of the pin located inside the frame; the first spring is coaxially sleeved on the outside of the pin, and one end of the first spring is fixedly connected to the side of the convex ring near the positioning hole, and the other end is fixedly connected to the inner side wall of the frame near the positioning hole; the pin is detachably disposed in the through holes of the frame and the pin, and is used to lock the position of the pin.

[0006] The working principle of this technical solution is as follows: the base serves as the overall support carrier for the device, and the fixed worktable on its top provides a horizontal sliding reference surface for the lower die holder. The lower die holder is placed on the worktable in a sliding bearing manner and can be translated along a set direction, creating conditions for switching between multiple lower die positions. Multiple positioning holes opened on the worktable along the sliding direction form a hole-shaft fit with the insertion post of the fixed component, which is the core structure for positioning and locking the lower die holder, ensuring that the position does not shift during stamping. The threaded rod is rotatably mounted in the mounting cavity inside the worktable through a bearing, forming a threaded pair with the threaded block fixed at the bottom of the lower die holder. According to the characteristics of thread transmission, the rotational motion of the threaded rod can be converted into the linear motion of the threaded block, thereby driving the lower die holder to translate synchronously. The guide block fixed on the side of the threaded block is slidably embedded in the guide groove of the worktable. The extension direction of the guide groove is consistent with the axis of the threaded rod, which can limit the rotational tendency of the threaded block with the threaded rod, ensuring that the lower die holder slides smoothly only along the set direction and avoids deviation. In the fixed assembly, the first spring, in its natural state, applies an elastic thrust toward the positioning hole to the insert pin via the convex ring, causing the insert pin to be inserted into the positioning hole and thus positioning the lower mold base. When the lower mold base needs to be moved, the insert pin is pulled to compress the first spring, and the inserted pin passes through the through hole of the insert pin to lock its position, thereby releasing the positioning. This forms a dual control logic of elastic reset and mechanical locking, taking into account both positioning stability and ease of operation.

[0007] To better realize this utility model, one end of the threaded rod penetrates the side wall of the workbench and extends to the outside of the workbench, and a handwheel is fixedly provided at the end of the threaded rod located outside the workbench. The outer peripheral wall of the handwheel is provided with anti-slip texture. The threaded rod and the threaded block are threadedly connected by a trapezoidal thread to improve transmission stability and load-bearing capacity. The guide block and the guide groove inside the workbench are clearance fit, and the outer peripheral wall of the guide block is coated with a wear-resistant coating.

[0008] To better realize this utility model, two sliders symmetrically distributed along the axis of the convex ring are fixedly provided on the outer peripheral wall of the convex ring; two sliding grooves corresponding to the sliders are opened on the inner side wall of the frame, and the extending direction of the sliding grooves is consistent with the sliding direction of the insert; the sliders are slidably embedded in the corresponding sliding grooves, and the sliders and sliding grooves are in transition fit.

[0009] To better realize this utility model, furthermore, a support frame is fixedly provided on each of the two sides of the top of the base, and the two support frames are symmetrically distributed; a crossbeam is fixedly connected to the top of the two support frames, and a hydraulic cylinder is fixedly provided at the bottom of the crossbeam, with the piston rod of the hydraulic cylinder extending downward in the vertical direction; a lifting seat is fixedly driven to the end of the piston rod of the hydraulic cylinder, and an upper mold base is detachably connected to the bottom of the lifting seat; an upper mold is fixedly installed at the bottom of the upper mold base, and the upper mold corresponds vertically to the lower mold in the stamping position on the lower mold base, and the cavity of the upper mold is adapted to the cavity of the corresponding lower mold.

[0010] To better realize this utility model, furthermore, a guide rod is fixedly provided on the inner sidewalls of the two supporting frames respectively, and the two guide rods are distributed in the vertical direction and are symmetrically distributed; a guide hole is opened at both ends of the lifting seat, and the axis of the guide hole is in the vertical direction; the lifting seat is slidably sleeved on the corresponding guide rod through the guide holes at both ends, and a linear bearing is provided between the guide hole and the guide rod.

[0011] To better realize this utility model, the top of the upper mold base is further provided with two support blocks symmetrically distributed along the length direction of the upper mold base. The cross-sectional shape of the support blocks is T-shaped, and the horizontal section of the support blocks is located at the top, while the vertical section is fixedly connected to the top of the upper mold base. The bottom of the lifting seat has two grooves corresponding to the support blocks. The cross-sectional shape of the grooves is adapted to the cross-sectional shape of the support blocks, and the grooves are through slots extending along the width direction of the lifting seat. The support blocks can be adapted to be embedded in the corresponding grooves to form a pre-positioning of the upper mold base and the lifting seat.

[0012] To better realize this utility model, the upper mold base is further provided with four symmetrically distributed bolt holes along its circumference, and the four bolt holes are respectively located at the four corners of the top of the upper mold base; a fixing bolt is adapted to pass through each bolt hole, and an internal thread hole is provided at the bottom of the lifting seat corresponding to the bolt hole; the screw section of the fixing bolt is threadedly connected to the internal thread hole of the lifting seat to fasten the upper mold base to the bottom of the lifting seat.

[0013] To better realize this utility model, furthermore, a mounting block is fixedly provided on each of the two sides of the bottom of the upper mold base, the two mounting blocks are symmetrically distributed, and the two mounting blocks are respectively located on both sides of the upper mold; each mounting block has a sliding hole through it in the vertical direction, and a sliding rod slides through the sliding hole; a pressure plate is fixedly connected to the bottom of the sliding rod, and the bottom end face of the pressure plate is a flat surface, which is used to press and fix the metal sheet of the terminal block on the lower mold before stamping; a second spring is coaxially sleeved on the section of the sliding rod between the mounting block and the pressure plate; one end of the second spring is fixedly connected to the bottom of the mounting block, and the other end is fixedly connected to the top of the pressure plate, and the second spring can push the pressure plate to be held in the lowest position in the natural state.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects: (1) By setting up a mold changing device consisting of a threaded rod, a threaded block, a guide block and a fixing component, the lower mold base does not need to be disassembled when changing the lower mold. Only the pin needs to be pulled out to release the pin positioning, and the handwheel can be turned to drive the lower mold base to slide smoothly along the guide block through the threaded rod. After the target lower mold moves to the stamping station, the pin is automatically inserted into the positioning hole under the action of the first spring reset, and the pin is then inserted to lock and complete the positioning. This reduces the operation steps, greatly reduces the intensity of manual operation, and improves the mold changing efficiency. (2) In this utility model, three equidistant lower molds are set on the lower mold base, which can be adapted to three different types of terminal metal sheets. Combined with the quick mold changing mechanism, the production specifications can be quickly switched to meet the continuous production needs of multiple types of terminal blocks. It is especially suitable for small batch and multiple batch order scenarios, effectively improving the production adaptability of the equipment. (3) The clearance fit between the guide block and the guide groove of the worktable and the precise fit between the insert and the positioning hole in this utility model ensure that there is no offset during the sliding process of the lower mold base. After the mold is changed, the alignment accuracy between the lower mold and the upper mold is high, avoiding the problem of repeated calibration after the existing device is changed, and ensuring the consistency of stamping quality. (4) In this utility model, the upper mold base is pre-positioned by the T-shaped support block and the groove of the lifting seat. During installation, only the support block needs to be embedded in the groove to achieve initial alignment. No manual lifting and calibration is required. Then, it is tightened by four symmetrically distributed fixing bolts. Compared with the existing mold connection method without pre-positioning structure, the installation efficiency is improved and misalignment during bolt installation is avoided. The detachable design of the upper mold base and the lifting seat makes it possible to remove the upper mold base by simply removing the fixing bolts when the upper mold is worn or needs to be replaced. There is no need to disassemble the connection between the lifting seat and the hydraulic cylinder, which simplifies the operation steps, reduces the time cost of mold maintenance and replacement, and facilitates the separate inspection and maintenance of the upper mold base. (5) This utility model provides a pre-pressing component consisting of a mounting block, a sliding rod, a pressure plate and a second spring at the bottom of the upper mold base. Before stamping, the pressure plate contacts the metal sheet first under the action of the second spring force, and presses the metal sheet tightly onto the lower mold, avoiding dimensional deviations caused by force displacement of the metal sheet during stamping. At the same time, the elastic buffering effect of the second spring can prevent the pressure plate from causing excessive squeezing damage to the metal sheet, ensuring the flatness of the metal sheet surface, which can significantly improve the forming accuracy of the terminal metal sheet and ensure the smooth insertion of wires and conductivity stability during subsequent terminal assembly. (6) In this utility model, the threaded rod and the threaded block are connected by trapezoidal threads, which improves the load-bearing capacity and has stronger wear resistance compared with ordinary triangular threads; the outer peripheral wall of the guide block is coated with a wear-resistant coating, which can reduce the friction coefficient, reduce the component wear during the sliding process, and extend the service life of the guide structure; the four fixing plates are symmetrically distributed at the four corners of the lower mold base, and the positioning force of the fixing components on the lower mold base is evenly distributed, avoiding the deformation of the lower mold base due to uneven local force; the two vertically distributed guide rods ensure that the lifting seat is not tilted during the lifting process, and the upper mold is subjected to vertical downward force when stamping, reducing the lateral wear of the mold and extending the service life of the upper and lower molds; (7) This utility model, through its innovative mold changing mechanism, optimized mold connection structure and reliable workpiece positioning design, not only solves the core problems of cumbersome mold changing and inaccurate positioning in existing devices, but also significantly improves production efficiency, product quality and equipment durability. It has good industrial application value and is suitable for widespread application. Attached Figure Description

[0015] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the workbench of this utility model; Figure 3 This is a schematic diagram of the internal structure of the fixing component of this utility model; Figure 4 This is a schematic diagram of the internal structure of the lifting seat of this utility model.

[0016] Wherein: 1—base, 2—workbench, 3—lower mold base, 4—lower mold, 5—threaded rod, 6—handwheel, 7—threaded block, 8—guide block, 9—fixed plate, 10—frame, 11—insertion post, 12—convex ring, 13—first spring, 14—slider, 15—pin, 16—positioning hole, 17—support frame, 18—hydraulic cylinder, 19—lifting seat, 20—upper mold base, 21—upper mold, 22—support block, 23—fixing bolt, 24—guide rod, 25—mounting block, 26—sliding rod, 27—pressure plate, 28—second spring. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly including one or more of the feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] 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.

[0020] Example 1: The main structure of this embodiment is as follows: Figures 1-3 As shown, it includes: The base 1 has a workbench 2 fixedly mounted on its top. The workbench 2 has a lower die base 3 slidably mounted on its top, and the workbench 2 has multiple positioning holes 16 symmetrically distributed along the sliding direction of the lower die base 3. The lower die base 3 has three lower molds 4 equidistantly distributed along the horizontal direction fixedly mounted on its top. The three lower molds 4 are adapted to the stamping and forming requirements of different types of terminal metal sheets. A die-changing device is provided to drive the lower die holder 3 to slide and position on the worktable 2, thereby switching different lower dies 4 to the stamping station. The die-changing device includes: a threaded rod 5, a threaded block 7, a guide block 8, four fixing plates 9, and a fixing assembly. The threaded rod 5 is rotatably mounted in an installation cavity inside the worktable 2 via bearings, and the axial direction of the threaded rod 5 is consistent with the sliding direction of the lower die holder 3. The threaded block 7 is fixedly mounted at the bottom of the lower die holder 3, and the threaded block 7 is threadedly engaged with the threaded rod 5. The guide block 8 is fixedly mounted on the side of the threaded block 7, and the guide block 8 is slidably embedded in a guide groove inside the worktable 2, the extension direction of the guide groove being consistent with the axial direction of the threaded rod 5. The four fixing plates 9 are respectively fixedly mounted at the four corners of the bottom of the lower die holder 3, and the four fixing plates 9 are symmetrically distributed. Each fixing plate 9 has a corresponding... A fixing assembly is provided; the fixing assembly includes a frame 10, a pin 11, a convex ring 12, a first spring 13, and a pin 15; the frame 10 is fixedly disposed on the side of the fixing plate 9 away from the center of the lower mold base 3; the pin 11 slides horizontally through the frame 10 and the fixing plate 9, and one end of the pin 11 can be adapted to be inserted into the positioning hole 16 on the worktable 2, and two through holes for the pin 15 to pass through are opened at intervals along its axial direction on the pin 11; the convex ring 12 is coaxially fixedly sleeved on the section of the pin 11 located inside the frame 10; the first spring 13 is coaxially sleeved on the outside of the pin 11, and one end of the first spring 13 is fixedly connected to the side of the convex ring 12 near the positioning hole 16, and the other end is fixedly connected to the inner side wall of the frame 10 near the positioning hole 16; the pin 15 is detachably disposed in the through hole of the frame 10 and the pin 11, and is used to lock the position of the pin 11.

[0021] The specific implementation method is as follows: First, the base 1 is fixed on a horizontal ground using bolts or welding. A workbench 2 is installed on top of the base 1. Along the length of the workbench 2, i.e., the sliding direction of the lower mold base 3, multiple symmetrically distributed positioning holes 16 are drilled according to the dimensions matching the distance to the lower mold 4. The hole diameter is adapted to the outer diameter of the insert post 11. A threaded block 7 is welded or bolted to the center of the bottom of the lower mold base 3, and guide blocks 8 are symmetrically fixed on both sides of the threaded block 7. Simultaneously, four symmetrically distributed fixing plates 9 are welded to the four corners of the bottom of the lower mold base 3. A frame 10 is welded to the side of each fixing plate 9 furthest from the center of the lower mold base 3. The insert post 11 is slidably inserted through the frame 10 and the fixing plate 9. A section of the frame 10 is coaxially welded with a convex ring 12. A first spring 13 is sleeved on the outside of the insert post 11, and the two ends of the first spring 13 are welded and fixed to the side of the convex ring 12 near the positioning hole 16 and the inner side wall of the frame 10 near the positioning hole 16, respectively. Two through holes for the insertion pin 15 to pass through are machined at intervals along the axis on the insert post 11. The lower mold base 3 is placed on the worktable 2, so that the guide block 8 is embedded in the guide groove of the worktable 2. Then, the threaded rod 5 is installed in the mounting cavity of the worktable 2 through the bearing to ensure that the threaded rod 5 and the threaded block 7 are precisely engaged. Finally, three lower molds 4 are bolted to the top of the lower mold base 3 according to the principle of equal spacing. The three lower molds 4 are respectively adapted to different types of terminal metal sheets.

[0022] The operator pulls out the pin 15 of the fixing component and pulls the insert 11 away from the positioning hole 16. The convex ring 12 compresses the first spring 13 simultaneously until the insert 11 is completely disengaged from the positioning hole 16. The pin 15 is then inserted through the through hole of the insert 11 away from the positioning hole 16 to lock the position of the insert 11, thus completing the positioning release of the lower mold base 3. The threaded rod 5 is rotated using an external tool such as a wrench. The threaded rod 5 engages with the threaded block 7, driving the lower mold base 3 to slide along the guide groove. During the process, the position of the lower mold 4 is observed. When the target lower mold 4 moves to the point where the stamping station coincides with the projection of the subsequent upper mold 21, the rotation of the threaded rod 5 is stopped. The pin 15 is pulled out, and the first spring 13 releases its elastic potential energy, pushing the convex ring 12 to drive the insert 11 into the corresponding positioning hole 16. The pin 15 is then inserted through the through hole of the insert 11 near the positioning hole 16 to lock the insert 11 again, thus completing the switching and positioning of the lower mold 4.

[0023] Example 2: This embodiment, based on the above embodiment, further defines the positional relationship between the threaded rod 5 and the worktable 2, such as... Figure 1 , Figure 2As shown, one end of the threaded rod 5 penetrates the side wall of the workbench 2 and extends to the outside of the workbench 2. A handwheel 6 is fixedly installed at the end of the threaded rod 5 located outside the workbench 2. The outer peripheral wall of the handwheel 6 is provided with anti-slip texture. The threaded rod 5 and the threaded block 7 are threadedly connected by a trapezoidal thread to improve transmission stability and load-bearing capacity. The guide block 8 is clearance-fitted with the guide groove inside the workbench 2, and the outer peripheral wall of the guide block 8 is coated with a wear-resistant coating. The handwheel 6 is fixed at the end of the threaded rod 5 extending to the outside of the workbench 2. According to the lever principle, the handwheel 6 increases the force arm and reduces the torque required to rotate the threaded rod 5. The anti-slip texture on the outer peripheral wall of the handwheel 6 increases the coefficient of friction between the hand and the handwheel 6, preventing slippage during rotation and improving operational safety and convenience. The threaded rod 5 and the threaded block 7 are connected by a trapezoidal thread. Compared with ordinary triangular threads, trapezoidal threads have a larger tooth angle and higher root strength, which can withstand greater radial loads and axial forces, reducing the risk of thread deformation or damage during long-term use. At the same time, trapezoidal threads have higher transmission efficiency, ensuring smoother movement of the lower die holder 3. The wear-resistant coating on the outer peripheral wall of the guide block 8 reduces the coefficient of friction between the guide block 8 and the guide groove, reducing sliding wear. The coating also has anti-aging and anti-corrosion properties, which can extend the service life of the guide block 8 and the guide groove, ensuring the long-term sliding stability of the lower die holder 3.

[0024] The specific implementation process is as follows: A through hole is machined on the side wall of the workbench 2 corresponding to the position of the threaded rod 5. One end of the threaded rod 5 is passed through the through hole and extended to the outside of the workbench 2. The handwheel 6 is fixed to the outer end of the threaded rod 5 using a flat key connection. Anti-slip textures are machined on the outer peripheral wall of the handwheel 6 using a knurling process. A trapezoidal thread is machined on the mating surface of the threaded rod 5 and the threaded block 7, with the specifications set according to the weight of the lower mold base 3. After machining, the thread surface is heat-treated to improve the thread's wear resistance and load-bearing capacity. The guide block 8 is machined from 45# steel, and its outer peripheral wall is sandblasted to remove the surface oxide layer and burrs. A polytetrafluoroethylene wear-resistant coating is applied to the outer peripheral wall of the guide block 8 using an electrostatic spraying process and cured at a constant temperature of 200℃ for 2 hours to ensure a tight bond between the coating and the substrate of the guide block 8, eliminating the risk of peeling.

[0025] When switching the lower mold 4, the operator holds the handwheel 6 and rotates it clockwise or counterclockwise according to the required direction of movement of the lower mold base 3. The trapezoidal thread transmission drives the lower mold base 3 to slide smoothly along the guide groove. Due to the lever arm of the handwheel 6, the torque applied by the operator can be reduced by 40%-50%, making operation easier. When the guide block 8 slides within the guide groove, the wear-resistant coating reduces frictional resistance, ensuring smooth movement of the lower mold base 3 and guaranteeing positioning accuracy. Other parts of this embodiment are the same as those in the above embodiment and will not be repeated.

[0026] Example 3: This embodiment further defines the structure of the convex ring 12 based on the above embodiments, such as... Figure 3 As shown, two sliders 14 are fixedly disposed on the outer peripheral wall of the convex ring 12, symmetrically distributed along the axis of the convex ring 12; two sliding grooves corresponding to the sliders 14 are formed on the inner side wall of the frame 10, and the extension direction of the sliding grooves is consistent with the sliding direction of the insert post 11; the sliders 14 are slidably embedded in the corresponding sliding grooves, and the sliders 14 and the sliding grooves are in a transition fit. The two symmetrical sliders 14 fixed on the outer peripheral wall of the convex ring 12 and the corresponding sliding grooves formed on the inner side wall of the frame 10 form a "sliding pair". The extension direction of the sliding grooves is consistent with the sliding direction of the insert post 11, which can limit the radial displacement of the convex ring 12 in the frame 10, that is, limit the radial wobbling of the insert post 11, and ensure that the insert post 11 slides only in a straight line in the horizontal direction; the transition fit between the sliders 14 and the sliding grooves can not only ensure the smooth sliding of the sliders 14, but also avoid the tilting of the insert post 11 due to excessive gap, further improving the alignment accuracy between the insert post 11 and the positioning hole 16 and reducing the risk of positioning failure.

[0027] The specific implementation process is as follows: On the outer peripheral wall of the convex ring 12, two rectangular mounting grooves are symmetrically machined along its axis, with dimensions adapted to the slider 14. The slider 14 is fixed in the mounting grooves by welding or bolt connection. The slider 14 is made of wear-resistant cast iron HT300 material, and its sliding surface is ground after machining to ensure smooth sliding. On the inner side wall of the frame 10, a rectangular groove is machined corresponding to the position of the slider 14. The length of the groove is consistent with the sliding stroke of the insert 11, and the width and height of the groove are larger than those of the slider 14 to ensure a smooth transition fit. After machining, the inner wall of the groove is polished to remove burrs and machining marks. The convex ring 12 with the slider 14 is installed together with the insert 11 into the frame 10, so that the slider 14 is accurately embedded in the corresponding groove. Then, the first spring 13 is installed to ensure that when the insert 11 slides, the slider 14 can move synchronously along the groove without jamming or offset.

[0028] When releasing the lower die holder 3 from its positioning, the operator pulls the insert pin 11, and the convex ring 12 drives the slider 14 to slide smoothly along the slide groove. Due to the guide constraint of the slide groove, the insert pin 11 has no radial tilt and always remains coaxial with the positioning hole 16. After the insert pin 11 is completely disengaged from the positioning hole 16, the pin 15 is inserted to lock the position, and the lower die holder 3 can then be moved. After the lower die holder 3 moves to the target station, the pin 15 is pulled out, and the first spring 13 pushes the convex ring 12 and the insert pin 11 to reset. The slider 14 is guided along the slide groove, so that the insert pin 11 is accurately inserted into the positioning hole 16, ensuring that after the lower die holder 3 is positioned, the alignment accuracy between the lower die 4 and the upper die 21 meets the stamping requirements. The other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0029] Example 4: This embodiment, based on the above embodiment, further adds a support frame 17, such as... Figure 4As shown, a support frame 17 is fixedly installed on each side of the top of the base 1, and the two support frames 17 are symmetrically distributed. A crossbeam is fixedly connected to the top of the two support frames 17. A hydraulic cylinder 18 is fixedly installed at the bottom of the crossbeam. The piston rod of the hydraulic cylinder 18 extends downward in the vertical direction. A lifting seat 19 is fixedly driven to the end of the piston rod of the hydraulic cylinder 18. An upper mold base 20 is detachably connected to the bottom of the lifting seat 19. An upper mold 21 is fixedly installed at the bottom of the upper mold base 20. The upper mold 21 corresponds vertically to the lower mold 4 in the stamping position on the lower mold base 3, and the cavity of the upper mold 21 is adapted to the cavity of the corresponding lower mold 4. The symmetrically fixed support frames 17 on both sides of the top of the base 1 and the top crossbeam form a portal support frame, providing a stable installation foundation for the hydraulic cylinder 18. The hydraulic cylinder 18 serves as the stamping power source, with its piston rod extending vertically and fixedly connected to the lifting seat 19. According to the hydraulic transmission principle, the hydraulic cylinder 18 can output a stable axial thrust, driving the lifting seat 19, the upper die seat 20, and the upper die 21 to rise and fall synchronously, providing the required pressure for metal sheet stamping.

[0030] The upper mold 21, fixed at the bottom of the upper mold base 20, forms a concave-convex fit with the lower mold 4, which is located in the stamping position on the lower mold base 3. The cavity of the upper mold 21 is perfectly matched with the cavity of the corresponding lower mold 4. When the hydraulic cylinder 18 drives the upper mold 21 to press down, the metal sheet placed in the cavity of the lower mold 4 can be extruded and formed to meet the shape and size requirements of the terminal metal sheet. The detachable connection between the upper mold base 20 and the lifting base 19 makes it easy to replace the corresponding upper mold 21 according to the model of the lower mold 4, so as to realize multi-model compatible production.

[0031] The specific implementation process is as follows: On both sides of the top of the base 1, two support frames 17 are fixed with bolts according to symmetrical dimensions matching the width of the lifting seat 19. The support frames 17 are made of Q235 steel with a rectangular cross-section to ensure support strength. On the top of the two support frames 17, a crossbeam is fixed by welding or bolting. The bottom of the crossbeam is machined with a flat mounting surface for fixing the hydraulic cylinder 18. The hydraulic cylinder 18 is fixed to the bottom of the crossbeam with flange bolts, ensuring that the piston rod of the hydraulic cylinder 18 extends downward in the vertical direction. At the end of the piston rod of the hydraulic cylinder 18, the lifting seat 19 is fixed by threaded connection or pin connection to ensure a firm connection without the risk of loosening. The upper mold 21 is fixed to the bottom of the upper mold base 20 with bolts. The cavity of the upper mold 21 is machined according to the shape of the target terminal metal piece. The upper mold base 20 is initially connected to the bottom of the lifting seat 19 with bolts. The position of the upper mold base 20 is adjusted to ensure that the upper mold 21 corresponds vertically with the lower mold 4 in the stamping position on the lower mold base 3. Then, the connecting bolts are tightened.

[0032] The metal sheet to be stamped is placed on the lower die base 3 and inside the cavity of the lower die 4 at the stamping station, ensuring that the metal sheet fits snugly against the bottom surface of the cavity without any offset. The hydraulic cylinder 18 is activated, and its piston rod extends downwards, causing the lifting seat 19, upper die base 20, and upper die 21 to move downwards synchronously. Once the upper die 21 contacts the metal sheet, the hydraulic cylinder 18 continues to output pressure until the metal sheet completely fits against the cavity of the lower die 4, completing the stamping process. After stamping, the piston rod of the hydraulic cylinder 18 is retracted upwards, causing the upper die 21 to return to its initial position. The operator then removes the formed metal sheet, and the next stamping cycle can begin. If a different stamping model needs to be changed, the upper die 21 on the upper die base 20 is replaced first, and then the lower die 4 switching steps of Embodiment 1 are followed to achieve the stamping of different metal sheet models. Other parts of this embodiment are the same as those in the above embodiments and will not be repeated.

[0033] Example 5: This embodiment, based on the above embodiment, further adds a guide rod 24, such as... Figure 4 As shown, a guide rod 24 is fixedly installed on the inner sidewalls of the two opposing support frames 17. Both guide rods 24 are vertically distributed and symmetrically arranged. A guide hole is opened at each end of the lifting seat 19, with the axis of the guide hole pointing vertically. The lifting seat 19 is slidably fitted onto the corresponding guide rod 24 through the guide holes at both ends, and a linear bearing is installed between the guide hole and the guide rod 24. The two symmetrically distributed guide rods 24 are fixed vertically to the inner sidewalls of the support frames 17, forming a dual-axis constraint structure with the guide holes at both ends of the lifting seat 19. According to the rigid body motion constraint theory, the dual-axis guidance can restrict all degrees of freedom of the lifting seat 19 in the horizontal direction, ensuring that the lifting seat 19 only moves linearly in the vertical direction, avoiding stamping deviation caused by tilting when the upper mold 21 is pressed down. The linear bearing installed between the guide hole and the guide rod 24 transforms traditional sliding friction into rolling friction of the internal balls of the bearing. According to the principles of tribology, the rolling friction coefficient is much smaller than the sliding friction coefficient, which can significantly reduce the resistance of the lifting seat 19 during lifting and reducing the wear of the guide rod 24 and the guide hole; at the same time, the high precision characteristics of the linear bearing can further improve the movement accuracy of the lifting seat 19.

[0034] The specific implementation process is as follows: threaded holes adapted to guide rods 24 are machined on the inner sidewalls of the two support frames 17 respectively, and the axis of the threaded holes is ensured to be vertical; one end of the guide rod 24 is fixed in the threaded hole by thread to ensure that the axes of the two guide rods 24 are parallel and coaxial with the piston rod axis of the hydraulic cylinder 18.

[0035] At both ends of the lifting seat 19, guide holes corresponding to the guide rod 24 are machined, and the diameter of the guide holes is larger than that of the guide rod 24. The linear bearing is press-fitted into the guide hole with an interference fit to ensure that the outer ring of the linear bearing fits tightly with the guide hole without loosening. The inner ring of the linear bearing and the guide rod 24 are fitted with a clearance fit to ensure that the lifting seat 19 can slide smoothly.

[0036] The lifting seat 19 is mounted on the two guide rods 24 via linear bearings. Then, the lifting seat 19 is connected to the piston rod of the hydraulic cylinder 18 using a threaded connection and a lock nut. The lifting seat 19 is manually pushed up and down along the guide rods 24 to check for any jamming and ensure that the lifting process is smooth and without deviation.

[0037] Start the hydraulic cylinder 18 and control the piston rod to extend downward. Observe the movement state of the lifting seat 19: Due to the constraint of the double guide rod 24, the lifting seat 19 has no horizontal offset, and the alignment accuracy of the upper mold 21 and the lower mold 4 remains stable. During stamping, even if the output pressure of the hydraulic cylinder 18 fluctuates, the lifting seat 19 does not tilt, ensuring the forming size of the metal sheet.

[0038] After stamping is completed, the piston rod of the hydraulic cylinder 18 drives the lifting seat 19 to reset. The rolling friction of the linear bearing reduces the reset resistance, and the linear bearing can still maintain good sliding performance without replacement. The other parts of this embodiment are the same as those in the above embodiment, and will not be described again.

[0039] Example 6: This embodiment further defines the structure of the upper mold base 20 based on the above embodiments, such as... Figure 4As shown, two support blocks 22 symmetrically distributed along the length of the upper mold base 20 are fixedly disposed on the top of the upper mold base 20. The cross-sectional shape of the support block 22 is T-shaped, and the horizontal section of the support block 22 is located at the top, while the vertical section is fixedly connected to the top of the upper mold base 20. The bottom of the lifting seat 19 has two grooves corresponding to the support blocks 22. The cross-sectional shape of the grooves is adapted to the cross-sectional shape of the support blocks 22, and the grooves are through grooves extending along the width direction of the lifting seat 19. The support blocks 22 can be fitted into the corresponding grooves to form a pre-positioning of the upper mold base 20 and the lifting seat 19. The horizontal section of the T-shaped support block 22 and the groove of the lifting seat 19 form an inverted interlocking fit, which can limit the separation of the upper mold base 20 in the vertical direction. At the same time, the two sides of the T-shaped structure are in contact with the inner wall of the groove, which can limit the left and right displacement of the upper mold base 20 in the horizontal direction. The groove is designed as a through groove along the width direction of the lifting seat 19, which facilitates the quick insertion of the upper mold base 20 along the through groove direction and simplifies the installation operation. The cross-sectional shape of the support block 22 is perfectly matched with that of the groove. When the support block 22 of the upper mold base 20 is inserted into the groove of the lifting seat 19, the horizontal position of the upper mold base 20 is initially locked. There is no need for manual repeated adjustment of the position of the upper mold base 20, which provides a precise reference for subsequent bolt tightening and greatly improves the installation efficiency of the upper mold base 20.

[0040] The specific implementation process is as follows: Two T-shaped support blocks 22 are symmetrically welded to the top of the upper mold base 20 along its length; after welding, the surface of the support blocks 22 is ground to ensure the dimensional accuracy of the T-shaped cross-section and that the axes of the two support blocks 22 are parallel; at the bottom of the lifting seat 19, a groove is machined corresponding to the position of the support blocks 22, the cross-sectional shape of the groove is perfectly matched with the T-shaped support blocks 22, and the depth of the groove is consistent with the height of the vertical section of the support blocks 22; the groove is designed as a through groove along the width direction of the lifting seat 19, which facilitates the insertion of the support blocks 22 from the side; when installing the upper mold base 20, the T-shaped support blocks 22 of the upper mold base 20 are pushed in along the through groove direction of the groove of the lifting seat 19 until the support blocks 22 are completely inserted into the groove; at this time, the upper mold base 20 is pre-positioned, and the alignment error between the upper mold 21 and the lower mold 4 is checked with a dial indicator, and subsequent bolt tightening can be carried out without manual adjustment; After pre-positioning, the bolts are tightened. During the tightening process, due to the constraint of the support block 22, the upper die holder 20 does not shift position, and the final alignment of the upper die 21 and the lower die 4 meets the stamping accuracy requirements. The other parts of this embodiment are the same as those in the above embodiment, and will not be described again.

[0041] Example 7: This embodiment further defines the structure of the upper mold base 20 based on the above embodiments, such as... Figure 4As shown, the upper mold base 20 has four symmetrically distributed bolt holes along its circumference, located at the four corners of the top of the upper mold base 20. Each bolt hole is fitted with a fixing bolt 23. The bottom of the lifting seat 19 has an internally threaded hole corresponding to the bolt hole. The threaded section of the fixing bolt 23 is threaded into the internally threaded hole of the lifting seat 19 to secure the upper mold base 20 to the bottom of the lifting seat 19. The four fixing bolts 23 are symmetrically distributed along the circumference of the upper mold base 20. According to the principle of force balance, symmetrical tightening ensures uniform force distribution on the contact surfaces of the upper mold base 20 and the lifting seat 19, avoiding deformation of the upper mold base 20 due to localized stress concentration. Simultaneously, the "diagonal step-by-step tightening" method further ensures the flatness of the contact surfaces and reduces tilting of the upper mold base 20 due to uneven tightening.

[0042] Threaded connection reliability principle: The fixing bolt 23 and the internal threaded hole of the lifting seat 19 form a threaded pair. The threaded connection has self-locking property, which can ensure that the bolt will not loosen under the action of no external force. At the same time, the bolt is selected with high strength grade and is used in conjunction with spring washers, which can further improve the vibration resistance of the connection, avoid the bolt from loosening due to vibration during the stamping process, and ensure the long-term stability of the upper die seat 20.

[0043] The specific implementation process is as follows: On the upper mold base 20, four symmetrically distributed bolt holes are machined through it along its circumference. The diameter of the bolt holes is larger than the diameter of the screw of the fixing bolt 23, and the axis of the bolt holes is ensured to be perpendicular to the top surface of the upper mold base 20. At the bottom of the lifting seat 19, corresponding to the position of the bolt holes of the upper mold base 20, an internal thread hole is machined. The depth of the internal thread hole is longer than the effective thread length of the bolt, and the thread accuracy grade is 6H to ensure the fitting accuracy with the bolt.

[0044] Pass the bolts through the bolt holes of the upper mold base 20 and align them with the internal thread holes of the lifting seat 19. Use a diagonal step-by-step tightening method: first, use a torque wrench to pre-tighten the two diagonal bolts to 5 N·m, and then pre-tighten the other two diagonal bolts to 5 N·m. Then tighten all the bolts to the set torque in the same order to ensure that there is no gap between the contact surfaces of the upper mold base 20 and the lifting seat 19.

[0045] When replacing the upper mold 21, simply use a torque wrench to remove the four fixing bolts 23 to remove the upper mold base 20. The other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0046] Example 8: This embodiment further defines the structure of the upper mold base 20 based on the above embodiments, such as... Figure 4As shown, a mounting block 25 is fixedly installed on each side of the bottom of the upper mold base 20. The two mounting blocks 25 are symmetrically distributed and are located on both sides of the upper mold 21. Each mounting block 25 has a sliding hole through it in the vertical direction, and a sliding rod 26 slides through the sliding hole. A pressure plate 27 is fixedly connected to the bottom of the sliding rod 26. The bottom end face of the pressure plate 27 is flat and is used to press and fix the metal sheet of the terminal block onto the lower mold 4 before stamping. A second spring 28 is coaxially sleeved on the section of the sliding rod 26 between the mounting block 25 and the pressure plate 27. One end of the second spring 28 is fixedly connected to the bottom of the mounting block 25, and the other end is fixedly connected to the top of the pressure plate 27. In its natural state, the second spring 28 can push the pressure plate 27 to be held in the lowest position. The second spring 28 is in a slightly compressed state under natural conditions, applying a vertically downward preload to the metal sheet through the pressure plate 27. According to the principle of friction, the preload generates static friction between the metal sheet and the bottom surface of the lower mold cavity 4. The static friction is greater than the horizontal thrust on the metal sheet during stamping, which can prevent the metal sheet from shifting during stamping and ensure the accuracy of the forming dimensions. When the upper mold base 20 drives the upper mold 21 to move downward, the pressure plate 27 contacts the metal sheet first. As the upper mold base 20 continues to move downward, the slide rod 26 slides upward along the sliding hole of the mounting block 25, and the second spring 28 is further compressed. The preload increases with the increase of compression. Until the upper mold 21 contacts the metal sheet, the pressure plate 27 still maintains the preload on the metal sheet, realizing the synchronous following of "preload-stamping-reset", avoiding the displacement of the metal sheet due to lack of constraint in the early stage of stamping. At the same time, the elastic buffering effect of the second spring 28 can prevent the pressure plate 27 from causing excessive extrusion damage to the metal sheet.

[0047] The specific implementation process is as follows: Two symmetrically distributed mounting blocks 25 are welded to both sides of the bottom of the upper mold base 20; a sliding hole is machined through each mounting block 25 in a vertical direction, and the axis of the sliding hole is ensured to be perpendicular to the bottom surface of the upper mold base 20. A pressure plate 27 is welded to the bottom of the sliding rod 26; the sliding rod 26 is inserted into the top of the sliding hole of the mounting block 25, and a second spring 28 is coaxially sleeved on the section of the sliding rod 26 between the mounting block 25 and the pressure plate 27, so that the two ends of the second spring 28 are welded and fixed to the bottom of the mounting block 25 and the top of the pressure plate 27, respectively.

[0048] After assembly, check the initial position of the pressure plate 27: In the natural state of the second spring 28, the bottom surface of the pressure plate 27 is 5-8mm lower than the bottom surface of the upper mold 21 to ensure that the pressure plate contacts the metal sheet first during stamping; manually press the pressure plate 27 to check whether the slide bar 26 slides smoothly, whether the spring is compressed evenly, and whether there is any jamming.

[0049] A 0.5mm thick copper sheet is placed in the cavity of the lower mold 4. The hydraulic cylinder 18 is activated to move the upper mold base 20 downward. When the upper mold base 20 moves down 5mm, the pressure plate 27 contacts the metal sheet and applies pre-pressure, and the metal sheet is pressed and fixed. It continues to move down 2mm, and the upper mold 21 contacts the metal sheet and completes the stamping. During the process, the metal sheet does not move.

[0050] Without pre-pressing, the dimensional deviation rate of the metal sheet after stamping is about 8%, and the hole position offset rate is about 5%. Under the pre-pressing structure in this embodiment, the dimensional deviation rate is reduced to below 1.5%, the hole position offset rate is reduced to below 0.8%, and there is no extrusion damage on the surface of the metal sheet, proving that the pre-pressing structure can effectively improve the stamping quality.

[0051] After stamping is completed, the upper die holder 20 resets, and the second spring 28 pushes the pressure plate 27 to reset synchronously, restoring the initial position and preparing for the next stamping, thus achieving stability in continuous production. The other parts of this embodiment are the same as those in the above embodiment and will not be repeated here.

[0052] It is understood that the working principle and working process of the terminal metal sheet stamping device structure according to one embodiment of the present utility model, such as the hydraulic cylinder 18 and the lifting seat 19, are existing technologies and are well known to those skilled in the art, and will not be described in detail here.

[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wire terminal metal sheet stamping apparatus characterized by, include: A base (1) is provided with a workbench (2) fixedly mounted on the top of the base (1); a lower mold base (3) is slidably supported on the top of the workbench (2), and a plurality of positioning holes (16) are symmetrically distributed along the sliding direction of the lower mold base (3) on the top of the workbench (2); three lower molds (4) are fixedly mounted on the top of the lower mold base (3) and are equidistantly distributed along the horizontal direction. The three lower molds (4) are adapted to the stamping and forming requirements of different types of terminal metal sheets. A die-changing device is used to drive the lower die holder (3) to slide and position on the worktable (2) to switch different lower dies (4) to the stamping station; the die-changing device includes: a threaded rod (5), a threaded block (7), a guide block (8), four fixing plates (9) and a fixing assembly; the threaded rod (5) is rotatably mounted in the mounting cavity opened inside the worktable (2) by bearings, and the axial direction of the threaded rod (5) is consistent with the sliding direction of the lower die holder (3); the threaded block (7) is fixedly mounted on the lower die holder (3) 3) The bottom, and the threaded block (7) is threadedly engaged with the threaded rod (5); the guide block (8) is fixedly disposed on the side of the threaded block (7), and the guide block (8) is slidably embedded in the guide groove opened inside the worktable (2), and the extension direction of the guide groove is consistent with the axial direction of the threaded rod (5); the four fixing plates (9) are respectively fixedly disposed at the four corners of the bottom of the lower mold base (3), and the four fixing plates (9) are symmetrically distributed; each fixing plate (9) is provided with a set of fixing components; The fixing assembly includes a frame (10), a pin (11), a protruding ring (12), a first spring (13), and a pin (15); the frame (10) is fixedly disposed on the side of the fixing plate (9) away from the center of the lower mold base (3); the pin (11) slides horizontally through the frame (10) and the fixing plate (9), and one end of the pin (11) can be adapted to be inserted into the positioning hole (16) on the worktable (2), and two pins (15) are spaced apart along its axial direction on the pin (11) for the pin (15) to pass through. The through hole is provided; the convex ring (12) is coaxially fixedly sleeved on the section of the insert (11) located inside the frame (10); the first spring (13) is coaxially sleeved on the outside of the insert (11), and one end of the first spring (13) is fixedly connected to the side of the convex ring (12) near the positioning hole (16), and the other end is fixedly connected to the inner side wall of the frame (10) near the positioning hole (16); the pin (15) is detachably provided in the through hole of the frame (10) and the insert (11) for locking the position of the insert (11).

2. The wire terminal metal sheet punching device according to claim 1, wherein One end of the threaded rod (5) penetrates the side wall of the workbench (2) and extends to the outside of the workbench (2). A handwheel (6) is fixedly installed at the end of the threaded rod (5) located outside the workbench (2). Anti-slip texture is provided on the outer peripheral wall of the handwheel (6). The threaded rod (5) and the threaded block (7) are connected by a trapezoidal thread to improve transmission stability and load-bearing capacity. The guide block (8) is clearance-fitted with the guide groove inside the workbench (2). The outer peripheral wall of the guide block (8) is coated with a wear-resistant coating.

3. The terminal metal sheet punching device according to claim 1 or 2, wherein Two sliders (14) are fixedly arranged on the outer peripheral wall of the convex ring (12) and symmetrically distributed along the axis of the convex ring (12); two sliding grooves corresponding to the sliders (14) are opened on the inner side wall of the frame (10), and the extension direction of the sliding grooves is consistent with the sliding direction of the insert (11); the sliders (14) are slidably embedded in the corresponding sliding grooves, and the sliders (14) and the sliding grooves are in transition fit.

4. The terminal metal sheet punching device according to claim 1 or 2, wherein A support frame (17) is fixedly installed on both sides of the top of the base (1), and the two support frames (17) are symmetrically distributed. A crossbeam is fixedly connected to the top of the two support frames (17), and a hydraulic cylinder (18) is fixedly installed at the bottom of the crossbeam. The piston rod of the hydraulic cylinder (18) extends downward in the vertical direction. A lifting seat (19) is fixedly driven to the end of the piston rod of the hydraulic cylinder (18), and an upper mold base (20) is detachably connected to the bottom of the lifting seat (19). An upper mold (21) is fixedly installed at the bottom of the upper mold base (20). The upper mold (21) corresponds to the lower mold (4) in the stamping position on the lower mold base (3), and the cavity of the upper mold (21) is adapted to the cavity of the corresponding lower mold (4).

5. The wire terminal sheet stamping device of claim 4, wherein, A guide rod (24) is fixedly installed on the inner sidewalls of the two support frames (17) respectively. The two guide rods (24) are distributed in the vertical direction and are symmetrically distributed. A guide hole is opened at both ends of the lifting seat (19), and the axis of the guide hole is in the vertical direction. The lifting seat (19) is slidably sleeved on the corresponding guide rod (24) through the guide holes at both ends, and a linear bearing is provided between the guide hole and the guide rod (24).

6. The wire terminal sheet stamping device of claim 5, wherein The top of the upper mold base (20) is fixedly provided with two support blocks (22) symmetrically distributed along the length direction of the upper mold base (20). The cross-sectional shape of the support block (22) is T-shaped, and the horizontal section of the support block (22) is located at the top, while the vertical section is fixedly connected to the top of the upper mold base (20). The bottom of the lifting seat (19) is provided with two grooves corresponding to the support blocks (22). The cross-sectional shape of the groove is adapted to the cross-sectional shape of the support block (22), and the groove is a through groove extending along the width direction of the lifting seat (19). The support block (22) can be adapted to be embedded in the corresponding groove to form a pre-position of the upper mold base (20) and the lifting seat (19).

7. The wire terminal metal sheet punching device according to claim 5 or 6, characterized by The upper mold base (20) has four symmetrically distributed bolt holes along its circumference, and the four bolt holes are located at the four corners of the top of the upper mold base (20); a fixing bolt (23) is fitted into each bolt hole, and an internal thread hole is opened at the bottom of the lifting seat (19) corresponding to the bolt hole; the screw section of the fixing bolt (23) is threadedly connected to the internal thread hole of the lifting seat (19) to fasten the upper mold base (20) to the bottom of the lifting seat (19).

8. The terminal metal sheet punching device according to claim 5 or 6, wherein A mounting block (25) is fixedly installed on both sides of the bottom of the upper mold base (20). The two mounting blocks (25) are symmetrically distributed and are located on both sides of the upper mold (21). Each mounting block (25) has a sliding hole through it in the vertical direction. A sliding rod (26) slides through the sliding hole. A pressure plate (27) is fixedly connected to the bottom of the sliding rod (26). The bottom end face of the pressure plate (27) is flat and is used to press and fix the metal sheet of the terminal block on the lower mold (4) before stamping. A second spring (28) is coaxially sleeved on the section of the sliding rod (26) between the mounting block (25) and the pressure plate (27). One end of the second spring (28) is fixedly connected to the bottom of the mounting block (25), and the other end is fixedly connected to the top of the pressure plate (27). The second spring (28) can push the pressure plate (27) to keep it in the lowest position in its natural state.

Images