A bowl-shaped hollow spot welding rivet die

Abstract

The application discloses a bowl-shaped hollow spot welding rivet die and belongs to the technical field of spot welding die.The upper die is arranged on the upper side of the lower die, a bottom stamping assembly, a blanking assembly and a stretching assembly are sequentially arranged between the upper die and the lower die, and a strip material lifting device is arranged on the top of the lower die.The bottom stamping assembly can stamp on the strip material to form the shape of the rivet bottom on the strip material, the blanking assembly can complete blanking between the workpiece and the strip material, and the stretching assembly can stretch and form the workpiece and completely separate the workpiece from the strip material.Three stamping modes are adopted to realize the stamping and forming of the rivet, the rivet stamping effect is good, the formed rivet meets the quality requirements, the strip material lifting device can push and lift the strip material, the strip material is separated from the top of the lower die, the formed rivet on the strip material does not hinder the conveying of the strip material after the strip material passes through the bottom stamping assembly and the blanking assembly, and the continuous stamping of the rivet is realized.

Description

Technical Field

[0001] A bowl-shaped hollow spot welding rivet mold belongs to the field of spot welding rivet mold technology. Background Technology

[0002] Electric hot pots, as a popular household kitchen appliance, are generally used with a composite bottom brazing process, where the pot body, heat spreader, and heating element are welded together. However, due to the different materials and coefficients of thermal expansion of the pot body and heat spreader, the composite bottom may crack after prolonged use.

[0003] To address the issue of weld cracking on the composite bottom, the inventors created a bowl-shaped hollow spot-welded rivet, as shown in the instruction manual. Figure 14 The rivet is shaped like a hollow bowl with multiple protrusions on the outer bottom. The bottom face protrudes inward. First, the rivet is spot-welded to the corresponding part of the bottom outer side of the pot body and the heat spreader. After the bottom outer side of the pot body and the corresponding part of the heat spreader are coated with solder flux, they are riveted together with the heat spreader. The bowl-shaped rivet is directly embedded into the heat spreader and then brazed together with a brazing machine, which increases the firmness between the pot body and the heat spreader.

[0004] Rivets are made by stamping stainless steel strip. Due to the special shape of rivets, it is difficult to form them in a single stamping process, and the stamped rivets are of poor quality and strength. If multiple stamping processes are used, the bottom protrusion needs to be stamped first, and then the workpiece needs to be stamped into a cup shape. However, after stamping the protrusion, it will hinder the conveying of the workpiece. Since continuous stamping is not currently possible for this type of rivet, the stamping speed is slow. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a bowl-shaped hollow spot welding rivet mold that can realize rivets through multiple stamping and can eliminate the problem of difficult material conveying after stamping.

[0006] The technical solution adopted by the present invention to solve its technical problem is: the bowl-shaped hollow spot welding rivet mold is characterized in that: it includes an upper mold, a lower mold and a material lifting device, the upper mold is set on the upper side of the lower mold, and a bottom stamping component, a blanking component and a stretching component are arranged in sequence between the upper mold and the lower mold, and the material lifting device is installed on the top of the lower mold.

[0007] Preferably, the material lifting device includes material track blocks and an elastic lifting device. Material track blocks are provided on both sides of the top of the lower die, spaced apart, forming a material channel between them. Each material track block has an inwardly protruding stop portion on its inner upper side. The elastic lifting device is located within the material channel, with its top protruding from the top of the lower die. The bottom of the upper die has a clearance hole directly opposite the material track block. The elastic lifting device can push the material upward and position it on the stop portion. Furthermore, when the upper and lower dies cooperate for stamping, the elastic lifting device can retract into the lower die to avoid obstructing the stamping of the rivets.

[0008] Preferably, the material conveying track blocks are arranged in several pairs along the material conveying direction. Each pair of material conveying track blocks includes two blocks symmetrically arranged on both sides of the lower die, and an elastic lifting device is provided between each pair of material conveying track blocks. The arrangement of several pairs of material conveying track blocks along the material conveying direction, and the provision of an elastic lifting device between each pair of material conveying track blocks, ensures that the entire material is completely separated from the lower die.

[0009] Preferably, the elastic lifting device includes a floating push rod and a support spring. The floating push rod is slidably mounted on the lower die, and the support spring is located between the floating push rod and the lower die. The top of the floating push rod protrudes upward from the top of the lower die. The support spring pushes the floating push rod upward, which can both move downward as the lower die descends to avoid obstructing the rivet's stamping and also allow the floating push rod to move upward again when the upper and lower dies separate, thus pushing the material away from the lower die.

[0010] Preferably, the bottom stamping assembly includes a bottom stamping punch disposed at the bottom of the upper die and a bottom stamping die disposed at the top of the lower die. The bottom of the bottom stamping punch is an arc shape with a concave center and has several protruding protrusions. The bottom stamping die is an arc shape with a convex center and has grooves corresponding to the protrusions. The bottom stamping punch and the bottom stamping die cooperate to form the shape of the rivet bottom on the strip.

[0011] Preferably, the blanking assembly includes a blanking punch disposed at the bottom of the upper die and a blanking die disposed at the top of the lower die. The upper part of the blanking die is cylindrical, and the diameter of the lower part gradually decreases from top to bottom. The end of the blanking punch can extend into the upper part of the blanking die.

[0012] Preferably, the side of the blanking punch is provided with an axial slot, and at least two slots are provided around the blanking punch. The slot on the side of the blanking punch can form a rib between the rivet and the strip while the rivet is being formed, preventing the rivet from separating from the strip and allowing the rivet to continue to be fed with the strip.

[0013] Preferably, the stretching assembly includes a forming assembly and a connecting rib cutting assembly, the connecting rib cutting assembly being arranged around the forming assembly. The connecting rib cutting assembly can cut the connecting rib between the workpiece and the strip, and the forming assembly can stretch the punched workpiece into shape.

[0014] Preferably, the connecting rib cutting assembly includes a connecting rib cutting punch disposed on the upper die and a cutting die disposed on the lower die, wherein the end of the connecting rib cutting punch can extend into the cutting die.

[0015] Preferably, the forming component includes a stretching punch disposed on the upper die, the diameter of the lower part of the cutting die is smaller than the diameter of the upper part, and a transition part with a gradually decreasing diameter from top to bottom is provided between the upper and lower parts of the cutting die, the stretching punch can slide into the lower part of the cutting die, and the lower die is provided with a blanking hole communicating with the bottom of the cutting die.

[0016] Compared with the prior art, the beneficial effects of this invention are:

[0017] The bottom stamping component of this bowl-shaped hollow spot welding rivet mold can stamp on the strip to form the shape of the rivet bottom. The blanking component can blank the workpiece on the strip, and the stretching component can stamp the workpiece. The rivet is stamped and formed by two stamping methods, which can ensure good stamping effect and that the formed rivets meet the quality requirements. The strip lifting device can push the strip to lift it, so that the strip is separated from the top of the lower die, so as to avoid the rivets formed on the strip after stamping by the bottom stamping component and blanking component from hindering the conveying of the strip. This realizes continuous stamping of rivets and improves the production speed of rivets. Attached Figure Description

[0018] Figure 1 A three-dimensional schematic diagram of a bowl-shaped hollow spot welding rivet mold.

[0019] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0020] Figure 3 This is a front view schematic diagram of a bowl-shaped hollow spot welding rivet mold.

[0021] Figure 4 This is a three-dimensional schematic diagram of the lower mold.

[0022] Figure 5 for Figure 4 A magnified view of a section at point B in the middle.

[0023] Figure 6 for Figure 4 A magnified view of a section at point C.

[0024] Figure 7 This is a schematic diagram of the left sectional view of the lower mold.

[0025] Figure 8 for Figure 7 A magnified view of a section at point D.

[0026] Figure 9 This is a three-dimensional schematic diagram of the upper mold.

[0027] Figure 10 for Figure 9 A magnified view of a section at point E in the middle.

[0028] Figure 11 for Figure 9 A magnified view of a section at point F.

[0029] Figure 12 This is a three-dimensional schematic diagram of a punching punch.

[0030] Figure 13 This is a three-dimensional schematic diagram of the bottom stamping punch.

[0031] Figure 14 This is a three-dimensional diagram of a rivet.

[0032] In the diagram: 1. Mold base plate; 2. Upper mold top plate; 3. Lower mold bottom plate; 4. Inlet device 401; Inlet roller 402; Mounting plate 403; Mounting groove 404; Guide wheel 405; Mounting bolt; 5. Oil cup; 6. Lower fixing plate; 7. Upper fixing plate 701; Mounting hole; 8. Rubber plate; 9. Unloading plate; 10. Guide column; 11. Unloading groove; 12. Material track block 1201; Stopping part; 13. Bottom stamping die; 14. Floating push rod 1401; Support platform; 15. Blanking die; 16. Cutting die; 17. Blanking hole; 18. Cutting die. 19. Cutting plate, 20. Support spring, 21. Clearance hole, 22. Upper die guide sleeve, 23. Cutting block, 2301. Bottom stamping punch, 24. Bottom stamping part, 25. Guide hole stamping rod guide hole, 26. Guide pin, 27. Blanking punch guide hole, 28. Blanking punch, 2801. Groove, 29. Connecting rib cutting punch, 30. Drawing punch, 31. Rivet, 3101. Spot welding part, 3102. Outer protrusion, 32. Guide hole stamping hole, 33. Inner concave part, 34. Bottom stamping punch guide hole, 35. Punch fixing plate. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention necessarily exceeds the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but still fall within the protection scope of this application.

[0034] Figures 1-14 This is the preferred embodiment of the present invention, which is described below in conjunction with the accompanying drawings. Figures 1-14 The present invention will be further described below.

[0035] A bowl-shaped hollow spot welding rivet mold includes an upper mold, a lower mold, and a strip lifting device. The upper mold is positioned above the lower mold. A bottom stamping assembly, a blanking assembly, and a stretching assembly are sequentially arranged between the upper and lower molds. The strip lifting device is installed on top of the lower mold. The bottom stamping assembly of this bowl-shaped hollow spot welding rivet mold can stamp the strip to form the bottom shape of a rivet 31. The blanking assembly can form the shape of the rivet 31 on the strip. The blanking assembly can blank the workpiece on the strip, and the stretching assembly can stamp the workpiece. The rivet 31 is formed by a two-stage stamping process, ensuring good stamping effect and that the formed rivet 31 meets quality requirements. The strip lifting device can push the strip to lift, separating the strip from the top of the lower mold. This prevents the rivet 31 formed on the strip after stamping by the bottom stamping assembly and blanking assembly from hindering the conveying of the strip, achieving continuous stamping of the rivet 31 and improving the production speed of the rivet 31.

[0036] Specifically: such as Figures 1-2 As shown: This bowl-shaped hollow spot welding rivet mold also includes an inlet device 4, an oil cup 5, and a mold base plate 1. The inlet device 4 is located on one side of the mold base plate 1, and the lower mold is installed on the upper side of the mold base plate 1. The inlet device 4 and the lower mold are arranged side by side, and the upper mold is located directly above the lower mold. The oil cup 5 is located between the inlet device 4 and the lower mold. The bottom of the oil cup 5 is provided with an oil drip port. The oil cup 5 is located on the upper side of the conveying strip to drip lubricating oil onto the strip. The upper mold is installed on the upper mold top plate 2 and is located on the lower side of the upper mold top plate 2. The lower mold is installed on the lower mold bottom plate 3 and is located on the upper side of the mold base plate 1. The lower mold bottom plate 3 and the mold base plate 1 are detachably connected.

[0037] The import device 4 includes a transverse import device and a longitudinal import device, which are arranged sequentially along the direction close to the lower mold.

[0038] The longitudinal feeding device includes a feeding roller 401, which is horizontally arranged and rotatably mounted on the mold pad 1. Two feeding rollers 401 are arranged side by side from top to bottom with a gap between them. The strip passes between the two feeding rollers 401, and the two feeding rollers 401 can feed the strip in the vertical direction.

[0039] The transverse guiding device includes two guide wheels 404 symmetrically arranged on both sides of the mold base plate 1. The axes of the guide wheels 404 are vertically aligned, and the two guide wheels 404 are spaced apart. The strip material passes between the two guide wheels 404. The two guide wheels 404 are capable of guiding the strip material in the horizontal direction.

[0040] A mounting plate 402 is installed on the upper side of the mold base plate 1. The upper side of the mounting plate 402 is provided with a mounting groove 403 with a "T" shaped cross section. Each guide wheel 404 is installed on the mounting plate 402 by mounting bolts 405. The mounting bolts 405 can rotatably pass through the corresponding guide wheel 404 and are threadedly connected to the mounting plate in the mounting groove 403, thereby realizing the installation of the guide wheel 404.

[0041] like Figure 3 As shown: The upper die includes a punch fixing plate 35, a rubber plate 8, and a ejector plate 9 arranged sequentially from top to bottom. The punch fixing plate 35 is installed at the bottom of the upper die top plate 2, the rubber plate 8 is installed at the bottom of the punch fixing plate 35, and the ejector plate 9 is installed at the bottom of the rubber plate 8. The ejector plate 9 includes an upper ejector plate and a lower ejector plate arranged side by side. The lower die includes a lower fixing plate 6 and an upper fixing plate 7. The lower fixing plate 6 is installed at the top of the lower die base plate 3, and the upper fixing plate 7 is installed at the top of the lower fixing plate 6. The bottom stamping assembly, the blanking assembly, and the stretching assembly are all arranged between the rubber plate 8 and the upper fixing plate 7.

[0042] like Figures 4-6 As shown: The conveyor belt lifting device includes conveyor belt track blocks 12 and an elastic lifting device. The conveyor belt track blocks 12 are disposed on the upper side of the upper fixed plate 7 and are fixedly connected to the upper fixed plate 7. The conveyor belt track blocks 12 are arranged in pairs, with several pairs arranged side by side and spaced apart along the conveyor belt direction. Each pair of conveyor belt track blocks 12 includes two blocks symmetrically arranged on both sides of the upper fixed plate 7. The two conveyor belt track blocks 12 in each pair are spaced apart, forming a conveyor belt channel for the conveyor belt to pass through between the two pairs of conveyor belt track blocks 12. The elastic lifting device is installed inside the upper fixed plate 7, and the bottom of the elastic lifting device is supported on the lower fixed plate 6. An elastic lifting device is provided between each pair of conveyor belt track blocks 12. The inner top of each conveyor belt track block 12 is provided with an inwardly protruding baffle part 1201. The bottom of the conveyor belt track block 12 is spaced apart from the top of the upper fixed plate 7. The elastic lifting device pushes the conveyor belt upward, and the baffle part 1201 limits the conveyor belt movement.

[0043] The top of the upper fixing plate 7 is also provided with guide posts 10, which are vertically arranged and whose bottoms are fixedly connected to the upper fixing plate 7. Several guide posts 10 are arranged side by side and spaced apart. In this embodiment, four guide posts 10 are arranged side by side and spaced apart on each side of the upper fixing plate 7.

[0044] The top of the upper fixed plate 7 is provided with a bottom stamping die 13, a blanking die 15 and a cutting die 16 from left to right.

[0045] The bottom stamping die 13 is an arc shape with a central upward convexity. Several grooves are provided on the top of the bottom stamping die 13. In this embodiment, three grooves are evenly distributed around the bottom stamping die 13. Two sets of bottom stamping dies 13 are arranged side-by-side and spaced apart along the conveying direction of the strip material. Each set of bottom stamping dies 13 includes three bottom stamping dies arranged side-by-side and spaced apart along a direction perpendicular to the conveying direction of the strip material. The central bottom stamping die 13 is located behind the two bottom stamping dies 13 in the same set along the conveying direction of the strip material, ensuring that the workpieces on the strip material directly opposite each bottom stamping die 13 do not interfere with each other. The bottom stamping die 13 is located directly below the strip material channel.

[0046] Two sets of blanking dies 15 are also arranged along the material conveying direction. Each set of blanking dies 15 includes three blanking dies arranged side by side and spaced apart along the direction perpendicular to the material conveying direction. The blanking die 15 located in the middle is located behind the two blanking dies 15 in the same set along the material conveying direction. The workpieces stamped by each bottom stamping die 13 can be directly opposite the corresponding blanking die 15 to achieve blanking of the workpiece.

[0047] The sides of each blanking die 15 are arc-shaped with a diameter that gradually decreases from top to bottom, and each blanking die 15 has a blind hole set on the top of the upper fixed plate 7.

[0048] The cutting die 16 is set on the top of the upper fixed plate 7. The bottom of the cutting die 16 is provided with a blanking hole 17 that passes through the upper fixed plate 7 and the lower fixed plate 6. The diameter of the lower part of the cutting die 16 is smaller than the diameter of the upper part. The middle part of the cutting die 16 is a transition part where the diameter gradually decreases from top to bottom. The diameter of the blanking hole 17 is larger than the diameter of the lower part of the cutting die 16 to facilitate the falling of the formed rivet 31. The workpiece cut by the cutting die 16 is formed in the lower part of the cutting die 16, and the formed rivet 31 is sent out through the blanking hole 17.

[0049] The top of the upper fixing plate 7 is also provided with a recessed portion 33, and the sides of each punching die 15 and each cutting die 16 are also provided with recessed portions 33, so as to prevent the workpiece after bottom stamping from being squeezed by the ejector plate 9 when other workpieces are formed, stamped or cut.

[0050] A feeding trough 11 is provided at the right end of the upper fixed plate 7. The feeding trough 11 is arranged downward along the conveying direction of the belt. A cutting plate 18 is also provided at the top of the upper fixed plate 7. The cutting plate 18 and the feeding trough 11 are arranged in sequence along the conveying direction of the belt. The cutting plate 18 can cut the waste belt material so that the waste belt material falls along the feeding trough 11.

[0051] The upper fixed plate 7 is also provided with guide hole punching holes 32, which are located at the material input end of the material channel. There are two guide hole punching holes 32 symmetrically arranged on both sides of the material channel. The upper fixed plate 7 is also provided with material guide holes, which are arranged in pairs, and each material guide hole includes two located on both sides of the material channel.

[0052] like Figures 7-8 As shown: The elastic lifting device includes a floating push rod 14 and a support spring 19. The upper fixed plate 7 is provided with a mounting hole 701 that penetrates the upper fixed plate 7. The mounting hole 701 is stepped with an upper diameter smaller than the lower diameter. A protruding support platform 1401 is provided around the middle of the floating push rod 14. The floating push rod 14 is slidably installed in the mounting hole 701. The support spring 19 is located on the lower side of the floating push rod 14. The bottom of the support spring 19 is supported on the top of the lower fixed plate 6. The lower part of the floating push rod 14 extends into the support spring 19. The top of the support spring 19 is supported on the bottom of the support platform 1401. The support spring 19 is in a compressed state and pushes the floating push rod 14 to move upward, so that the top of the support platform 1401 is supported on the shoulder of the mounting hole 701. At the same time, the top of the floating push rod 14 protrudes upward from the upper fixed plate 7.

[0053] like Figures 9-11 As shown: The bottom of the ejector plate 9 is provided with clearance holes 20 and upper die guide sleeves 21. The clearance holes 20 correspond one-to-one with the material track blocks 12, and the clearance holes 20 are located directly above the corresponding material track blocks 12. When the ejector plate 9 moves downward and fits against the upper fixed plate 7, the material track blocks 12 enter the corresponding clearance holes 20, preventing the material track blocks 12 from obstructing the movement of the ejector plate 9. The upper die guide sleeves 21 are installed inside the ejector plate 9, and the bottom of the upper die guide sleeves 21 is flush with the bottom of the ejector plate 9. The upper die guide sleeves 21 correspond one-to-one with the guide pillars 10, and the upper die guide sleeves 21 and the corresponding guide pillars 10 are coaxially arranged. When the ejector plate 9 fits against the upper fixed plate 7, the guide pillars 10 extend into the corresponding upper die guide sleeves 21, which can guide the ejector plate 9 and the upper fixed plate 7 to ensure accurate workpiece stamping, and can also limit the ejector plate 9 to accurately control the lower stop point of the ejector plate 9's stroke.

[0054] The upper die is provided with a bottom stamping punch 23, a blanking punch 28, a connecting rib cutting punch 29 and a stretching punch 30 in sequence along the material conveying direction.

[0055] The ejector plate 9 and the rubber plate 8 are provided with bottom stamping punch guide holes 34, which correspond one-to-one with the bottom stamping dies 13 and are located directly above the corresponding bottom stamping dies 13. Each bottom stamping punch guide hole 34 is equipped with a bottom stamping punch 23. The top of the bottom stamping punch 23 is fixedly connected to the punch fixing plate 35, and the bottom can slide through the rubber plate 8 and extend into the ejector plate 9. In the initial state, the bottom stamping punch 23 is entirely located within the bottom stamping punch guide hole 34.

[0056] When the upper die plate 2 moves downward and the ejector plate 9 is in contact with the upper fixed plate 7, the punch fixing plate 35 continues to move downward. At this time, the rubber plate 8 is squeezed, so that the bottom stamping punch 23 and the corresponding bottom stamping die 13 cooperate to complete the stamping on the strip. The bottom stamping die 13 and the bottom stamping punch 23 are combined to form the bottom stamping assembly.

[0057] The ejector plate 9 and the rubber plate 8 are provided with punch guide holes 27, which correspond one-to-one with the punch dies 15 and are located directly above the corresponding punch dies 15. Each punch guide hole 27 can be slidably installed with a punch 28. The top of the punch 28 is fixedly connected to the punch fixing plate 35, and in the initial state, the bottom of the punch 28 is located in the punch guide hole 27.

[0058] When the punch fixing plate 35 moves downward and the ejector plate 9 is in contact with the upper fixing plate 7, the punch fixing plate 35 continues to move downward. At this time, the rubber plate 8 is squeezed, so that the punching punch 28 and the corresponding punching die 15 cooperate to complete the punching on the strip. The punching punch 28 and the punching die 15 are combined to form a punching assembly. The upper part of the punching die 15 is cylindrical, and the lower part of the punching die 15 gradually decreases in diameter from top to bottom. The lower end of the punching punch 28 can slide into the upper part of the punching die 15.

[0059] The connecting rib cutting punch 29 is fixedly installed on the ejector plate 9. The connecting rib cutting punch 29 corresponds one-to-one with the cutting die 16 and is located directly above the corresponding cutting die 16. The bottom of the connecting rib cutting punch 29 protrudes from the bottom of the ejector plate 9. Each cutting die 16 is equipped with a stretching punch 30. The lower part of the stretching punch 30 is slidably set inside the corresponding connecting rib cutting punch 29, and the upper end of the stretching punch 30 slidably passes through the rubber plate 8 and is fixedly connected to the punch fixing plate 35. The lower part of the connecting rib cutting punch 29 slidably extends into the upper part of the cutting die 16, and the lower part of the stretching punch 30 slidably extends into the lower part of the cutting die 16. This not only allows the workpiece to be completely separated from the strip material, but also allows it to cooperate with the lower part of the cutting die 16 to stretch the workpiece into a bowl-shaped rivet 31. The formed rivet 31 falls through the blanking hole 17.

[0060] When the punch fixing plate 35 moves downward and the ejector plate 9 is in contact with the upper fixing plate 7, the lower part of the connecting rib cutting punch 29 extends into the upper part of the corresponding cutting die 16, completing the cutting of the connecting rib between the workpiece and the strip. The punch fixing plate 35 continues to move downward, at which point the rubber plate 8 is squeezed, causing the stretching punch 30 to move downward and stretch the workpiece to form a rivet 31. The stretched rivet 31 is then pushed into the blanking hole 17 and discharged from the blanking hole 17. The connecting rib cutting punch 29 and the cutting die 16 cooperate to form a connecting rib cutting assembly, and the stretching punch 30 and the lower part of the cutting die 16 form a forming assembly.

[0061] The upper die is also equipped with a cutting block 22, a guide pin 26, and a guide hole punching rod 25.

[0062] The ejector plate 9 and the rubber plate 8 are provided with cutting block mounting holes. The cutting block 22 is slidably installed in the cutting block mounting holes, and the top of the cutting block 22 is fixedly connected to the punch fixing plate 35. The cutting block mounting holes and the cutting plate 18 are located on the front side of the conveyor belt direction. When the ejector plate 9 is in contact with the upper fixing plate 7, the punch fixing plate 35 moves downward again, so that the cutting block 22 cooperates with the cutting plate 18 to cut off the waste conveyor belt.

[0063] The ejector plate 9 and the rubber plate 8 are also provided with guide holes 24 for the guide rods of the straightening holes. The guide holes 24 correspond one-to-one with the guide holes 32 and are positioned directly above the corresponding guide holes 32. A guide rod 25 is slidably installed within each guide hole 24. The top of the guide rod 25 is fixedly connected to the punch fixing plate 35. Initially, the guide rod 25 is located within the guide hole 24. When the ejector plate 9 is attached to the upper fixing plate 7, the punch fixing plate 35 moves downward again, causing the guide rod 25 to engage with the guide hole 32, forming guide holes on both sides of the strip.

[0064] Guide pins 26 are installed at the bottom of the ejector plate 9, and each guide pin 26 corresponds to a guide hole for the strip material, and is positioned directly above the corresponding guide hole. The diameter of the guide pins 26 gradually decreases from top to bottom. During the process of the ejector plate 9 and the upper fixing plate 7 being attached, the guide pins 26 first extend into the guide hole of the strip material, thereby achieving the positioning of the strip material and ensuring accurate stamping of the workpiece.

[0065] like Figure 12As shown: The bottom of the blanking punch 28 is provided with a slot 2801, and four slots 2801 are evenly distributed around the blanking punch 28. When the blanking punch 28 punches the workpiece, it can form a rib connection between the formed workpiece and the strip, preventing the workpiece from falling off the strip, thus facilitating the continued feeding of the workpiece with the strip to achieve the final cutting process. The blanking punch 28 is a combined cutting and stretching die. Due to the presence of the slots 2801, the formed workpiece and the strip are connected by connecting ribs, allowing the workpiece to continue to be fed synchronously with the strip.

[0066] like Figure 13 As shown: the end of the bottom stamping punch 23 is provided with an arc shape with a central concave part, and the end of the bottom stamping punch 23 is provided with a protrusion that corresponds one-to-one with the bottom stamping die 13, forming the bottom stamping part 2301.

[0067] like Figure 14 As shown: Rivet 31 is a closed cylinder at the bottom. The bottom of rivet 31 is a spot welded part 3101 with a concave center to facilitate fitting with the bottom of the pot body. The spot welded part 3101 is provided with several downwardly protruding external protrusions 3102. Three external protrusions 3102 are evenly distributed around the spot welded part 3101.

[0068] The working process of this bowl-shaped hollow spot welding rivet mold is as follows: In this embodiment, the strip is stainless steel strip. The stainless steel strip is guided by the guide roller 401 and the guide wheel 404 in sequence, and then enters between the ejector plate 9 and the upper fixing plate 7 after being coated with oil by the oil cup 5.

[0069] The material enters the material channel between the material track blocks 12 on both sides of the upper fixed plate 7. The material is located above the floating push rod 14 and below the stop part 1201.

[0070] The upper mold top plate 2 drives the ejector plate 9 downward, and the guide post 10 enters the upper mold guide sleeve 21, thereby positioning the ejector plate 9 and the upper fixed plate 7 until the ejector plate 9 is in contact with the upper fixed plate 7. Then the upper mold top plate 2 continues to move downward and squeezes the rubber plate 8, causing the guide hole punching rod 25 to move downward and cooperate with the guide hole punching hole 32 to punch guide holes on both sides of the strip. Then the upper mold top plate 2 drives the ejector plate 9 to reset.

[0071] The material continues to be conveyed for a specified distance, and then the upper mold top plate 2 drives the ejector plate 9 to move downward again. At this time, the guide pin 26 first enters the guide hole of the material, and then enters the guide hole of the material on the upper fixed plate 7, thereby realizing the precise positioning of the material.

[0072] At the same time, the upper die plate 2 continues to move downward. At this time, the rubber plate 8 is squeezed by the punch fixing plate 35, so that the bottom stamping punch 23 cooperates with the corresponding bottom stamping die 13 to complete the stamping on the strip, so that the spot welding part 3101 and the external protrusion 3102 are formed on the strip.

[0073] The punching punch 28 cooperates with the corresponding punching die 15 to complete the punching of the workpiece. Due to the presence of the slot 2801, the punched workpiece is connected to the strip through the connecting rib and moves synchronously with the strip.

[0074] After the ejector plate 9 is attached to the upper fixing plate 7, the lower part of the connecting rib cutting punch 29 extends into the upper part of the corresponding cutting die 16, completing the cutting of the connecting rib of the rivet 31. The upper die top plate 2 continues to move downward, at which point the rubber plate 8 is squeezed, causing the stretching punch 30 to move downward. The stretching punch 30 cooperates with the lower part of the cutting die 16 to stretch and shape the workpiece, forming the rivet 31, and pushing the rivet 31 into the blanking hole 17, so that the rivet 31 is sent out through the blanking hole 17.

[0075] The cutting block 22 cooperates with the cutting plate 18 to cut off the waste strip material, and the cut waste material falls from the feeding chute 11.

[0076] When stamping and cutting the workpiece, the part that has been stamped at the bottom but has not participated in the forming stamping and cutting enters the concave part 33, and the part that has been formed stamped but has not participated in the cutting also enters the concave part 33, so as to avoid the ejector plate 9 and the upper fixing plate 7 from damaging the workpiece after bottom stamping or forming stamping.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A bowl-shaped, hollow, spot-welded rivet die, characterized by: The strip material lifting device is installed on the top of the lower die, and the upper die is installed on the upper die top plate. The punch die (28) is provided on the bottom of the upper die, and the die cavity (15) is provided on the top of the lower die. The stretch assembly comprises a forming assembly and a connecting rib cutting assembly, the connecting rib cutting assembly is arranged around the forming assembly, the connecting rib cutting assembly comprises a connecting rib cutting punch (29) arranged on the upper die and a cutting cavity (16) arranged on the lower die, the end of the connecting rib cutting punch (29) can be inserted into the cutting cavity (16), the stretch punch (30) is arranged on the upper die, the diameter of the lower part of the cutting cavity (16) is smaller than that of the upper part, and a transition part with a gradually decreasing diameter from top to bottom is arranged between the upper part and the lower part of the cutting cavity (16), the stretch punch (30) can be slidably inserted into the lower part of the cutting cavity (16), and the lower die is provided with a blanking hole (17) in communication with the bottom of the cutting cavity (16). The upper die is installed on the upper die top plate (2), and the upper die is located on the lower side of the upper die top plate (2).

2. The bowl-shaped, hollow, pop-rivet die of claim 1, wherein: The strip material lifting device comprises strip material track blocks (12) and elastic lifting devices, the top of the lower die is provided with strip material track blocks (12) on both sides, the strip material track blocks (12) on both sides are arranged at intervals and form a strip material channel between them, the inner side of each strip material track block (12) is provided with a material blocking part (1201) protruding inward, the elastic lifting device is located in the strip material channel, the top of the elastic lifting device protrudes from the top of the lower die, and the bottom of the upper die is provided with a avoiding hole (20) opposite to the strip material track block (12).

3. The bowl-shaped, hollow, pop-rivet die of claim 2, wherein: The strip material track blocks (12) are arranged in pairs along the strip material conveying direction, each pair of strip material track blocks (12) comprises two blocks symmetrically arranged on both sides of the lower die, and an elastic lifting device is arranged between each pair of strip material track blocks (12).

4. The cup-shaped, hollow, pop-rivet die according to claim 2 or 3, characterized in that: The elastic lifting device comprises a floating push rod (14) and a supporting spring (19), the floating push rod (14) is slidably installed on the lower die, the supporting spring (19) is located between the floating push rod (14) and the lower die, and the top of the floating push rod (14) protrudes upward from the top of the lower die.

5. The bowl-shaped, hollow, pop-rivet die of claim 1, wherein: The bottom stamping assembly comprises a bottom stamping punch (23) arranged on the top of the upper die and a bottom stamping die (13) arranged on the bottom of the lower die, the bottom of the bottom stamping punch (23) is an arc-shaped concave in the middle, and the bottom of the bottom stamping punch (23) is provided with a plurality of convex protrusions, the bottom stamping die (13) is an arc-shaped convex in the middle, and the bottom stamping die (13) is provided with a groove opposite to the protrusion.

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