A stator core stamping device and process capable of achieving uniform thickness of riveting

Abstract

The application provides a stator core stamping equipment and process with uniform thickness of laminated riveting, and belongs to the field of stator core processing. The equipment comprises a base, a top plate is fixedly connected to the upper surface of the base through a support column, an upper die holder is arranged on the lower surface of the top plate, a middle part of the upper surface of the base is provided with a lower die holder, a constant pressure self-compensation mechanism is arranged in the upper die holder, the constant pressure self-compensation mechanism comprises a floating punch, a disc spring and a laminated riveting protrusion, the upper and lower sides of the floating punch are fixedly connected with the disc spring and the laminated riveting protrusion respectively, and the disc spring is arranged in the upper die holder through a pre-tightening force adjusting mechanism. Through the linkage mechanism and the pressure equalizing plate, an upward balancing force is applied to the stator core by the pressure equalizing plate during the stamping process, a "clamping" effect is formed with the downward pressure of the upper die, the bending trend of the middle part of the core is effectively resisted, the planeness of the punched core is excellent, and the finished product quality of the stator core is improved.

Description

Technical Field

[0001] This invention belongs to the field of stator core processing technology, specifically a stator core stamping equipment and process with uniform stacking thickness. Background Technology

[0002] The stator core is an important component of the motor's magnetic circuit. Together with the rotor core and the air gap between the stator and rotor, it forms the complete magnetic circuit of the motor. In asynchronous motors, the magnetic flux in the stator core is alternating, which results in core losses. Core losses include two parts: hysteresis losses and eddy current losses. Currently, stator core production requires the use of stacking and stamping equipment.

[0003] The stator core is made of a large number of silicon steel sheets stacked together and connected by riveting points. In the existing technology, the riveting punches of the stamping equipment are mostly rigid structures. When there are thickness tolerances in the silicon steel sheets or burrs at the riveting points, the pressure applied to the riveting points will be uneven, which will affect the consistency of the riveting height. In addition, the bending deformation of the core caused by the force on one side during riveting further aggravates the unevenness of the overall thickness of the core, affecting the motor performance.

[0004] Therefore, we propose a stator core stamping equipment and process with uniform stacking thickness to solve the problems encountered above. Summary of the Invention

[0005] The purpose of this invention is to address the problem that existing stamping equipment often uses rigid riveting punches, which can lead to uneven pressure applied to the riveting points when there are thickness tolerances in the silicon steel sheets or burrs at the riveting points. This can affect the consistency of the riveting height. Furthermore, the bending deformation of the iron core due to unilateral force during riveting further exacerbates the unevenness of the overall thickness of the iron core, affecting motor performance. Therefore, this invention proposes a stator iron core stamping equipment and process with uniform riveting thickness.

[0006] The objective of this invention can be achieved through the following technical solution: A base is included, with a top plate fixedly connected to the upper surface of the base via support columns. An upper mold base is provided on the lower surface of the top plate, and a lower mold base is provided in the middle of the upper surface of the base. A constant pressure self-compensating mechanism is provided inside the upper mold base, and the constant pressure self-compensating mechanism includes a floating punch, a disc spring, and a riveting protrusion. The upper end of the floating punch contacts the lower end of the disc spring, and the lower end of the floating punch is fixedly connected to the riveting protrusion. The disc spring is provided inside the upper mold base via a preload adjustment mechanism. Several floating punches, disc springs, and riveting protrusions are arranged in a circumferential array. A pressure equalizing plate is movably connected inside the lower mold base via a linkage mechanism, and several sets of linkage mechanisms are arranged in a circumferential array below the pressure equalizing plate. The pressure equalizing plate is located directly below the constant pressure self-compensating mechanism.

[0007] In a preferred embodiment of the present invention, the preload adjustment mechanism includes a second screw, which is rotatably mounted inside the upper mold base. A lifting plate is threadedly connected to the circumferential surface of the middle part of the second screw. An annular connecting plate is fixedly connected to the left and right ends of the lifting plate. The upper ends of several disc springs are connected to the lower surface of the annular connecting plate. A spur gear is provided on the circumferential surface of the upper end of the second screw. A transverse spur gear is meshed with the rear side of the spur gear. The first screw is fixedly mounted inside the transverse spur gear.

[0008] In a preferred embodiment of the present invention, the screw and the transverse straight tooth plate are slidably installed inside the upper mold base, and the left and right ends of the screw extend to the left and right sides of the upper mold base respectively. Nuts are screwed onto the circumferential surfaces of the left and right sides of the screw, and one side of each nut abuts against the outer wall of the left and right sides of the upper mold base respectively.

[0009] In a preferred embodiment of the present invention, the linkage mechanism includes a vertical straight toothed plate, a spur gear three is meshed with the side of the vertical straight toothed plate away from the pressure equalizing plate, a gear shaft is rotatably connected to the middle of the spur gear three, and a lifting plate two is provided on the rear side of the gear shaft. The end of the lifting plate two near the pressure equalizing plate is hinged to the lower end of the pressure equalizing plate through a hinge shaft. A convex shaft is provided on the upper surface of the front end of the spur gear three, and a lever is provided on the circumferential surface of the convex shaft. The end of the lever near the pressure equalizing plate is hinged to the lower end of the pressure equalizing plate through a hinge shaft.

[0010] In a preferred embodiment of the present invention, a groove is provided inside the side of the lever away from the pressure equalizing plate, and the convex shaft is inserted into the inside of the groove.

[0011] In a preferred embodiment of the present invention, a connecting shaft is provided at both the upper and lower ends of the vertical straight toothed plate. An annular connecting plate two is fixedly connected between the upper connecting shaft and the vertical straight toothed plate. The upper ends of several vertical straight toothed plates arranged in a circumferential array are all connected to the lower surface of the annular connecting plate two. A cross sliding connecting rod is provided at the lower end of the vertical straight toothed plate, and the lower end of the cross sliding connecting rod is slidably installed inside the lower connecting shaft. The lower connecting shaft is fixedly installed inside the lower mold base. A spur gear four is provided on the circumferential surface of the lower connecting shaft. A return spring is provided at both the upper and lower ends of the vertical straight toothed plate.

[0012] In a preferred embodiment of the present invention, a driving mechanism is provided inside the lower mold base. The driving mechanism includes a lifting electric cylinder and a rotary motor. Two lifting electric cylinders are symmetrically arranged on the left and right sides. The upper ends of the two lifting electric cylinders are respectively connected to the lower surfaces of the two lifting plates. The rotary motor is located at the bottom left side of the lower mold base. A spur gear is provided at the power output end of the rotary motor. A gear ring is meshed with the right side of the spur gear. The outer circumferential surface of the gear ring is meshed with several spur gears.

[0013] In a preferred embodiment of the present invention, a positioning rod is provided inside the lower mold base, the second lifting plate is slidably mounted on the positioning rod, an annular connecting plate is provided on the side of the positioning rod away from the pressure equalizing plate, one end of several second lifting plates away from the pressure equalizing plate is fixedly connected to the annular connecting plate, an annular rod is provided on the side of the positioning rod close to the pressure equalizing plate, the middle part of several levers is rotatably mounted on the annular rod, and the annular rod is fixedly connected to the second lifting plate.

[0014] In a preferred embodiment of the present invention, through slots are provided on both the left and right sides of the upper surface of the lower mold base, and the upper ends of the two upper connecting shafts are respectively disposed inside the two through slots. Lower pressing blocks are provided on both the left and right sides of the lower surface of the upper mold base, and the lower pressing blocks are disposed directly above the through slots.

[0015] As a preferred embodiment of the present invention, a stator core stamping process with uniform stacking thickness specifically includes the following steps:

[0016] Step 1: The feeding device conveys the sheet material from the rear to the front of the equipment, transporting it between the upper mold base and the lower mold base;

[0017] Step 2: The upper mold base moves downward to press the sheet metal.

[0018] Step 3: After the upper die base punches once, when it resets upwards, the sheet metal moves forward a short distance.

[0019] Step 4: Repeat steps 2 and 3 multiple times to stamp out a stator core.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] (1) Through the linkage mechanism and pressure equalizing plate, the pressure equalizing plate can apply an upward balancing force to the stator core during the stamping process, forming a "clamping" effect with the downward pressure of the upper die, effectively resisting the bending tendency of the core. This ensures that the stamped core has excellent flatness and improves the finished product quality of the stator core.

[0022] (2) By setting the pre-tightening force adjustment mechanism, it is ensured that the force of each rivet point is consistent, and the local rivet height is consistent from a microscopic point of view. The rivet thickness is uniform, and no manual intervention is required for thickness compensation, which ensures the stability and efficiency of continuous production.

[0023] (3) The lifting and lowering of the equalizing plate, the triggering of the lever, and the thickness compensation are cleverly linked through mechanical mechanisms such as gears, toothed plates, and levers, and triggered by the downward movement of the same upper mold. The structure is compact. The vertical straight toothed plate is disengaged and reset by using a rotary motor and toothed ring, realizing the automated work of "unlocking first, then lowering, and then locking", which ensures the reliability of the action and the correctness of the timing. Attached Figure Description

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a perspective view of the present invention.

[0027] Figure 3 This is a three-dimensional structural diagram of the interior of the upper mold base of the present invention;

[0028] Figure 4 This is a three-dimensional structural diagram of the lower mold base of the present invention;

[0029] Figure 5 For the present invention Figure 4 A schematic diagram of a partial three-dimensional structure.

[0030] In the diagram: 1. Base; 2. Top plate; 3. Support column; 4. Upper mold base; 5. Lower mold base; 6. Preload adjustment mechanism; 601. Screw 1; 602. Horizontal straight gear plate; 603. Spur gear 1; 604. Screw 2; 605. Lifting plate 1; 606. Annular connecting plate 1; 607. Nut; 7. Drive mechanism; 701. Lifting electric cylinder; 702. Rotary motor; 703. Spur gear 2; 704. Gear ring 1; 8. Linkage mechanism; 801. Vertical 802. Spur gear plate; 803. Connecting shaft; 804. Return spring; 805. Cross sliding connecting rod; 806. Spur gear three; 807. Lifting plate two; 808. Convex shaft; 809. Lever; 810. Positioning rod; 811. Spur gear four; 9. Floating punch; 10. Disc spring; 11. Riveted protrusion; 12. Pressure equalizing plate; 13. Lower pressure block; 14. Through groove; 15. Slide groove; 16. Annular connecting plate two; 17. Annular connecting plate three; 18. Annular rod. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1:

[0033] Please see Figure 1 - Figure 5 As shown, a stator core stamping device with uniform stacking thickness includes a base 1. A top plate 2 is fixedly connected to the upper surface of the base 1 via support columns 3. An upper die holder 4 is provided on the lower surface of the top plate 2. A hydraulic cylinder is connected to the upper end of the upper die holder 4 and is located on the upper surface of the top plate 2. The four corners of the upper die holder 4 are also slidably connected to the four support columns 3 via limiting sliders to improve the stability of the vertical movement of the upper die holder 4. A lower die holder 5 is provided in the middle of the upper surface of the base 1. A constant pressure self-compensation mechanism is provided inside the upper die holder 4. The constant pressure self-compensation mechanism includes a floating punch 9, a disc spring 10, and a stacking protrusion 11. The upper end of the floating punch 9 contacts the lower end of the disc spring 10. The lower end of the floating punch 9 is fixedly connected to the stacked riveting protrusion 11. The characteristic of the disc spring 10 is that it can provide almost constant pressure within its rated stroke. When the stacked riveting protrusion 11 contacts the plate and begins to be pressed, the force will push the floating punch 9 to compress the disc spring 10. This allows the stacked riveting protrusion 11 to move slightly in areas with burrs or uneven thickness on the plate, without affecting the punching force generated by the stacked riveting protrusion 11 on the plate. The disc spring 10 is set inside the upper die base 4 through the preload adjustment mechanism 6. Several floating punches 9, disc springs 10 and stacked riveting protrusions 11 are arranged in a circumferential array.

[0034] It should be noted that the arrangement of several floating punches 9, disc springs 10 and folding protrusions 11 can form a ring, making it the same as the stator core. Then, each folding protrusion 11 can correspond to the folding point on the plate. Therefore, no matter that the actual height of the folding point is slightly different due to burrs or other reasons, the module can stabilize the applied pressure at the preset value by automatically adjusting the compression stroke, thereby ensuring that the compaction degree of each folding point is consistent.

[0035] The preload adjustment mechanism 6 includes a second screw 604, which is rotatably mounted inside the upper mold base 4. A lifting plate 605 is threadedly connected to the circumferential surface of the middle part of the screw 604. Annular connecting plates 606 are fixedly connected to the left and right ends of the lifting plate 605. The upper ends of several disc springs 10 are connected to the lower surface of the annular connecting plate 606. A spur gear 603 is provided on the circumferential surface of the upper end of the screw 604. A transverse spur gear 602 is meshed with the rear side of the spur gear 603. The screw 604 is fixedly installed inside the transverse spur gear 602. 01. The screw 601 and the transverse straight gear plate 602 are slidably installed inside the upper mold base 4, and the left and right ends of the screw 601 extend to the left and right sides of the upper mold base 4 respectively. Nuts 607 are screwed onto the circumferential surfaces of the left and right sides of the screw 601, and one side of each nut 607 abuts against the outer wall of the left and right sides of the upper mold base 4 respectively. The upper mold base 4 has an active cavity inside for the transverse straight gear plate 602 to move, the spur gear 603 to rotate, and the lifting plate 605 and the annular connecting plate 606 to move vertically, so that the preload adjustment mechanism 6 can work smoothly.

[0036] It should be noted that when adjusting the initial preload of the disc spring 10, first rotate the nuts 607 at both ends of the screw 601 outward so that the nuts 607 no longer abut against the upper mold base 4. At this time, the screw 601 can move horizontally left and right, which in turn drives the transverse straight gear plate 602 to move horizontally left and right, which in turn drives the spur gear 603 and the screw 604 to rotate, so that the lifting plate 605 drives the annular connecting plate 606 to move vertically. When the annular connecting plate 606 moves vertically downward, it can increase the initial preload of the disc spring 10. When the annular connecting plate 606 moves vertically upward, it can decrease the initial preload of the disc spring 10. This allows for adjustment for plates of different thicknesses, making it widely applicable and more flexible in use.

[0037] The lower mold base 5 is movably connected to a pressure equalizing plate 12 via a linkage mechanism 8. Several sets of linkage mechanisms 8 are arranged in a circular array below the pressure equalizing plate 12. The pressure equalizing plate 12 is also a ring design and matches the stator core, allowing the stator core to be smoothly positioned and fitted onto the upper surface of the pressure equalizing plate 12. The pressure equalizing plate 12 is located directly below the constant pressure self-compensating mechanism. The linkage mechanism 8 includes a vertical spur gear plate 801. A spur gear 805 is meshed on the side of the vertical spur gear plate 801 away from the pressure equalizing plate 12. A gear shaft is rotatably connected to the middle of the spur gear 805. Furthermore, a lifting plate 2 806 is provided on the rear side of the gear shaft, allowing the spur gear 3 805 to rotate on the lifting plate 2 806 via the gear shaft. Simultaneously, when the lifting plate 2 806 moves vertically, it can also drive the spur gear 3 805 to move vertically via the gear shaft. The end of the lifting plate 2 806 near the pressure equalizing plate 12 is hinged to the lower end of the pressure equalizing plate 12 via a hinge shaft. A convex shaft 807 is provided on the upper surface of the front end of the spur gear 3 805, and a lever 808 is provided on the circumferential surface of the convex shaft 807. The end of the lever 808 near the pressure equalizing plate 12 is hinged to the lower end of the pressure equalizing plate 12 via a hinge shaft. Vertically... Both the upper and lower ends of the toothed plate 801 are provided with connecting shafts 802. An annular connecting plate 2 16 is fixedly connected between the upper connecting shaft 802 and the vertical straight toothed plate 801. The upper ends of several vertical straight toothed plates 801 arranged in a circular array are all connected to the lower surface of the annular connecting plate 2 16. A cross sliding connecting rod 804 is provided at the lower end of the vertical straight toothed plate 801, and the lower end of the cross sliding connecting rod 804 is slidably installed inside the lower connecting shaft 802, so that when the vertical straight toothed plate 801 moves vertically, the cross sliding connecting rod 804 at its lower end can move within the lower connecting shaft 802. The vertical movement inside prevents the vertical straight tooth plate 801 from jamming. The lower connecting shaft 802 is fixedly installed inside the lower mold base 5 and can provide positioning and support for the lower part of the vertical straight tooth plate 801 through the cross sliding connecting rod 804. The circumferential surface of the lower connecting shaft 802 is provided with a spur gear 810. Both the upper and lower ends of the vertical straight tooth plate 801 are provided with a return spring 803. The setting of the return spring 803 can reset the vertical straight tooth plate 801 and the upper connecting shaft 802 upward when the upper connecting shaft 802 is not affected by external force, so as to wait for the next operation.

[0038] It should be noted that the hinged connection between one end of the lifting plate 806 and the lower end of the pressure equalizing plate 12 allows the lifting plate 806 to move vertically, thus smoothly driving the pressure equalizing plate 12 to move vertically as the lifting plate 806 moves vertically. It also creates some space between one end of the lifting plate 806 and the pressure equalizing plate 12. Because of this space, when the lever 808 rotates and applies an upward force to the pressure equalizing plate 12, the pressure equalizing plate 12 can smoothly receive the upward force applied by the lever 808, thereby balancing the downward pressure during the stamping of the upper die holder 4, suppressing the bending of the iron core, and improving the quality of the iron core.

[0039] The upper surface of the lower die base 5 has through slots 14 on both the left and right sides. The upper ends of the two upper connecting shafts 802 are respectively set inside the two through slots 14. The lower surface of the upper die base 4 has lower pressing blocks 13 on both the left and right sides. The lower pressing blocks 13 are set directly above the through slots 14. The through slots 14 provide insertion space for the lower pressing blocks 13, so that when the upper die base 4 moves the lower pressing blocks 13 downward, the lower pressing blocks 13 can be smoothly inserted into the through slots 14, and then the connecting shafts 802 inside the through slots 14 are pressed downward. The lower end of the lower pressing block 13 is lower than the folding protrusion 11. This length difference must ensure that the folding protrusion 11 contacts the workpiece and begins to press after the equalizing plate 12 is lifted and fully contacts the bottom surface of the iron core.

[0040] A groove 15 is provided inside the side of the lever 808 away from the pressure equalizing plate 12. The convex shaft 807 is inserted into the groove 15. The groove 15 provides sliding space for the convex shaft 807. When the spur gear 3 805 drives the convex shaft 807 to rotate, the convex shaft 807 will slide inside the groove 15, and then smoothly drive the lever 808 to rotate.

[0041] The lower mold base 5 is equipped with a drive mechanism 7, which includes a lifting electric cylinder 701 and a rotary motor 702. There are two lifting electric cylinders 701 arranged symmetrically on the left and right sides. The upper ends of the two lifting electric cylinders 701 are fixedly connected to the lower surfaces of the two lifting plates 806 respectively. The rotary motor 702 is located at the inner bottom of the left side of the lower mold base 5. The power output end of the rotary motor 702 is equipped with a spur gear 703. The right side of the spur gear 703 is meshed with a gear ring 704. The lower surface of the gear ring 704 is rotatably mounted on the inner bottom of the lower mold base 5 through a support rod. The outer circumference of the gear ring 704 is meshed with several spur gears 810. When the rotary motor 702 is working, it can drive the gear ring 704 to rotate through the spur gear 703. Then the gear ring 704 can drive the several spur gears 810 on its outer circumference to rotate, thereby causing the vertical spur plate 801 to rotate axially.

[0042] The lower mold base 5 is equipped with a positioning rod 809. The second lifting plate 806 is slidably mounted on the positioning rod 809. The side of the positioning rod 809 away from the pressure equalizing plate 12 is provided with an annular connecting plate 17. The ends of several second lifting plates 806 away from the pressure equalizing plate 12 are fixedly connected to the annular connecting plate 17. The annular connecting plate 17 is provided so that when the two lifting cylinders 701 are working, the annular connecting plate 17 can drive several second lifting plates 806 to move vertically synchronously. The side of the positioning rod 809 near the pressure equalizing plate 12 is provided with an annular rod 18. The middle part of several levers 808 is rotatably mounted on the annular rod 18, providing a fulcrum for the levers 808 so that the levers 808 can rotate around the annular rod 18. The annular rod 18 is fixedly connected to the second lifting plate 806 so that when the second lifting plate 806 moves vertically, the annular rod 18 and the levers 808 can move vertically synchronously.

[0043] Example 2:

[0044] Please see Figure 2 and Figure 3 As shown, the present invention also discloses a stator core stamping process with uniform stacking thickness, which specifically includes the following steps;

[0045] Step 1: The feeding device conveys the sheet material from the rear to the front of the equipment. When the sheet material is conveyed between the upper mold base 4 and the lower mold base 5, the hydraulic cylinder above the top plate 2 is activated.

[0046] Step 2: The hydraulic cylinder drives the upper mold base 4 to move downwards. When the upper mold base 4 moves downwards, the lower pressure block 13 on its lower surface will first insert into the interior of the through groove 14 and contact the upper connecting shaft 802, pushing the connecting shaft 802 downwards. This causes the connecting shaft 802 to drive the vertical straight tooth plate 801 to move downwards. The downward movement of the vertical straight tooth plate 801 drives the spur gear 3 805 to rotate. The rotation of the spur gear 3 805 drives the lever 808 away from the pressure equalizing plate 12 to rotate downwards through the cam shaft 807. This causes the other end of the lever 808 to move upwards slightly, applying a pressure equalizing plate 12. An upward force is applied, and at the same time, the overlapping protrusion 11 below the upper die base 4 contacts the upper surface of the plate. Through the floating punch 9 and the disc spring 10, the overlapping protrusion 11 floats slightly during the stamping process, which offsets the burrs or thickness differences on the plate surface and keeps the pressure applied to the overlapping points basically constant. Then, the stator core is stamped above the equalizing plate 12 of the lower die base 5. During the stamping process, a downward force is applied to the stator core to balance the upward stamping force applied to the equalizing plate 12 by the lever 808, suppressing the bending of the core. After the stamping is completed, the hydraulic cylinder drives the upper die base 4 to return to its original position.

[0047] Step 3: After the upper die base 4 punches once, when it resets upwards, the sheet metal moves forward a short distance via the feeding device. Simultaneously, the lifting cylinder 701 and the rotary motor 702 are activated. The rotary motor 702 drives the gear ring 704 to rotate via the second spur gear 703. The rotation of the gear ring 704 drives the fourth spur gear 810 to rotate, which in turn causes the lower connecting shaft 802 to rotate axially via the cross sliding connecting rod 804, so that the tooth surface of the vertical spur gear 801 no longer interacts with the third spur gear. When 805 engages, the lifting cylinder 701 works to move the second lifting plate 806 downward by the thickness of one stack of plates. This causes the second lifting plate 806 to move the third spur gear 805, lever 808, and pressure equalizing plate 12 downward by the thickness of one stack of plates, so that the thickness of the next stacking is the same. After the third spur gear 805 has finished descending, the rotary motor 702 works in the opposite direction, causing the vertical spur gear plate 801 to rotate and reset, so that the vertical spur gear plate 801 engages with the third spur gear 805 again, waiting for the next stacking operation.

[0048] Step 4: Repeat steps 2 and 3 multiple times to stamp out a stator core.

[0049] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A kind of laminated riveting thickness uniformity stator core stamping equipment, including base (1), the upper surface of base (1) is fixedly connected with top plate (2) by support column (3), the lower surface of top plate (2) is provided with upper die holder (4), the middle part of the upper surface of base (1) is provided with lower die holder (5), it is characterized by, The upper die base (4) is provided with a constant pressure self-compensation mechanism, which includes a floating punch (9), a disc spring (10), and a stacked riveting protrusion (11). The upper end of the floating punch (9) is in contact with the lower end of the disc spring (10), and the lower end of the floating punch (9) is fixedly connected to the stacked riveting protrusion (11). The disc spring (10) is set inside the upper die base (4) through a preload adjustment mechanism (6). The floating punch (9), disc spring (10), and stacked riveting protrusion (11) are arranged in a circular array. The lower die base (5) is movably connected to a pressure equalizing plate (12) through a linkage mechanism (8). The linkage mechanism (8) is arranged in a number of groups and distributed in a circular array below the pressure equalizing plate (12). The pressure equalizing plate (12) is located directly below the constant pressure self-compensation mechanism. The linkage mechanism (8) includes a vertical straight tooth plate (801). A spur gear three (805) is meshed with the side of the vertical straight tooth plate (801) away from the pressure equalizing plate (12). A gear shaft is rotatably connected to the middle of the spur gear three (805), and a lifting plate two (806) is provided on the rear side of the gear shaft. The end of the lifting plate two (806) near the pressure equalizing plate (12) is hinged to the lower end of the pressure equalizing plate (12) through a hinge shaft. A convex shaft (807) is provided on the upper surface of the front end of the spur gear three (805), and a lever (808) is provided on the circumferential surface of the convex shaft (807). The end of the lever (808) near the pressure equalizing plate (12) is hinged to the lower end of the pressure equalizing plate (12) through a hinge shaft.

2. The stamping apparatus for a stator core with uniform thickness of cold upset according to claim 1, wherein The preload adjustment mechanism (6) includes a second screw (604), which is rotatably installed in the middle of the upper mold base (4). A lifting plate (605) is threadedly connected to the circumferential surface of the middle part of the second screw (604). A ring connecting plate (606) is fixedly connected to the ends of the left and right sides of the lifting plate (605). The upper ends of several disc springs (10) are connected to the lower surface of the ring connecting plate (606). A spur gear (603) is provided on the circumferential surface of the upper end of the second screw (604). A transverse spur gear plate (602) is meshed with the rear side of the spur gear (603). A screw (601) is fixedly installed inside the transverse spur gear plate (602).

3. The stamping apparatus for a stator core with uniform thickness of cold upset according to claim 2, wherein The screw (601) and the transverse straight tooth plate (602) are slidably installed inside the upper mold base (4), and the left and right ends of the screw (601) extend to the left and right sides of the upper mold base (4) respectively. Nuts (607) are screwed onto the circumferential surfaces of the left and right sides of the screw (601), and one side of each nut (607) abuts against the outer walls of the left and right sides of the upper mold base (4) respectively.

4. The stamping apparatus for the stator core with uniform thickness of cold upset according to claim 1, characterized in that, The lever (808) has a groove (15) on the side away from the pressure equalizing plate (12), and the convex shaft (807) is inserted into the groove (15).

5. The stamping apparatus for the stator core with uniform thickness of the cold upset according to claim 1, characterized in that, The vertical straight toothed plate (801) is provided with connecting shafts (802) at both the upper and lower ends. An annular connecting plate 2 (16) is fixedly connected between the upper connecting shaft (802) and the vertical straight toothed plate (801). The upper ends of several vertical straight toothed plates (801) arranged in a circular array are all connected to the lower surface of the annular connecting plate 2 (16). The lower end of the vertical straight toothed plate (801) is provided with a cross sliding connecting rod (804), and the lower end of the cross sliding connecting rod (804) is slidably installed inside the lower connecting shaft (802). The lower connecting shaft (802) is fixedly installed inside the lower mold base (5). A spur gear 4 (810) is provided on the circumferential surface of the lower connecting shaft (802). The upper and lower ends of the vertical straight toothed plate (801) are provided with return springs (803).

6. The stamping apparatus for a stator core with uniform thickness of cold upset according to claim 5, wherein The lower mold base (5) is equipped with a drive mechanism (7). The drive mechanism (7) includes a lifting electric cylinder (701) and a rotary motor (702). There are two lifting electric cylinders (701) arranged symmetrically on the left and right sides. The upper ends of the two lifting electric cylinders (701) are respectively connected to the lower surfaces of the two lifting plates (806). The rotary motor (702) is located at the bottom left side of the lower mold base (5). The power output end of the rotary motor (702) is equipped with a spur gear (703). The right side of the spur gear (703) is meshed with a gear ring (704). The outer circumferential surface of the gear ring (704) is meshed with several spur gears (810).

7. The stamping apparatus for the stator core with uniform thickness of the cold-pressed rivets according to claim 5, characterized in that, The lower mold base (5) is provided with a positioning rod (809) inside. The second lifting plate (806) is slidably installed on the positioning rod (809). The side of the positioning rod (809) away from the pressure equalizing plate (12) is provided with an annular connecting plate (17). One end of several second lifting plates (806) away from the pressure equalizing plate (12) is fixedly connected to the annular connecting plate (17). The side of the positioning rod (809) close to the pressure equalizing plate (12) is provided with an annular rod (18). The middle part of several levers (808) is rotatably installed on the annular rod (18). The annular rod (18) is fixedly connected to the second lifting plate (806).

8. The stamping apparatus for a stator core with uniform thickness of cold upset according to claim 5, wherein The upper surface of the lower mold base (5) is provided with through slots (14) on both the left and right sides. The upper ends of the two upper connecting shafts (802) are respectively located inside the two through slots (14). The lower surface of the upper mold base (4) is provided with pressing blocks (13) on both the left and right sides, and the pressing blocks (13) are located directly above the through slots (14).

9. A process for stamping a stator core with uniform thickness by stacking and riveting, characterized by, The stator core stamping equipment with uniform stacking thickness as described in any one of claims 1-8 specifically includes the following steps: Step 1: The feeding device conveys the sheet material from the rear to the front of the equipment, and conveys the sheet material between the upper mold base (4) and the lower mold base (5); Step 2: The upper mold base (4) moves downward to press the sheet metal. Step three, after the upper die holder (4) stamping once, when reset, the plate moves forward a section; Step four, after repeating steps two and three for several times, a stator core is stamped out.

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