A blanking and punching compound die based on strip forming

Abstract

This utility model provides a blanking and punching compound die based on strip forming, including an upper die mechanism and a lower die mechanism. The upper die mechanism includes an upper die base, an upper backing plate, an upper ejector plate, and an upper die cavity. The upper backing plate and the upper die cavity are sequentially connected to the bottom surface of the upper die base. The bottom surface of the upper die cavity has a cavity. The upper ejector plate is located in the cavity and is connected to the upper die base by a spring. The upper backing plate has a punch. The lower die mechanism includes a lower support plate, lower pads, a lower die base, a lower backing plate, a lower ejector plate, and a lower template. Multiple lower pads are spaced apart on the top surface of the lower support plate, and their top surfaces are connected to the lower die base. The lower backing plate is located on the top surface of the lower die base. The lower template is located on the top surface of the lower backing plate. A spring is located on the top surface of the lower die base, and the spring is connected to the lower ejector plate through a through hole on the lower backing plate. This utility model can complete blanking, forming, and punching in one station, combining multiple processes into one process, avoiding the cumulative error in dimensional accuracy caused by multiple positioning, and achieving high processing accuracy.

Description

Technical Field

[0001] This utility model relates to the field of blanking and punching compound die technology, and in particular to a blanking and punching compound die based on strip forming. Background Technology

[0002] Blanking dies are core process equipment in sheet metal stamping used to separate parts of desired shapes and sizes from sheet metal. Through the cooperation of the upper punch and lower die, the sheet metal is sheared and deformed under the action of a press, ultimately separating the part along a closed contour line. The cutting edge shape of the blanking die directly determines the shape of the part; an inverted structure is usually used to improve unloading efficiency. Punching dies, on the other hand, are process equipment specifically used to process holes in sheet metal. Their working principle is similar to that of blanking dies, but the shape of the punch corresponds to the hole contour, and the cutting edge size of the die must consider the hole diameter tolerance and punching clearance. During the punching process, waste material is discharged through the die hole, while the part remains on the raw material. Both are separation process dies, but their functional positioning is fundamentally different.

[0003] In existing technologies, blanking and punching of automotive sheet metal parts are typically completed as separate processes. First, a blanking die is used to punch out a regularly shaped blank from the coil or sheet metal. Then, a conveying device transfers the blank to the punching station, where the required holes are machined using a punching die. For complex parts, multiple positioning and punching operations may be required, and even additional shaping processes may be necessary. This step-by-step process has the following problems: multiple positioning operations lead to accumulated errors in dimensional accuracy, especially making it difficult to guarantee the positional accuracy of the holes relative to the part's outline. Utility Model Content

[0004] In view of this, the present invention proposes a blanking and punching compound die based on strip forming to solve the problems mentioned above. By setting up a blanking and punching compound die, for parts with strip forming features, blanking, forming, and punching are completed simultaneously, avoiding the cumulative error in dimensional accuracy caused by multiple positioning steps, resulting in high processing accuracy.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A blanking and punching compound die based on strip forming includes an upper die mechanism and a lower die mechanism. The upper die mechanism includes an upper die base, an upper backing plate, an upper die cavity, and an upper ejector plate. The upper backing plate and the upper die cavity are sequentially connected to the bottom surface of the upper die base. The bottom surface of the upper die cavity has a through cavity. The upper ejector plate is slidably disposed in the cavity and has a spring on its top surface. The upper backing plate has a through hole, and the spring passes through the through hole and is connected to the upper die base. The top of the upper die base has a countersunk hole, and a fixing bolt is slidably disposed in the countersunk hole. Its bottom passes through the upper backing plate and is fixedly connected to the upper ejector plate. The top surface of the upper backing plate has a punch, and the upper ejector plate has a through hole for the punch to slide.

[0007] The lower mold mechanism includes a lower support plate, lower pads, a lower mold base, a lower backing plate, a lower ejector plate, and a lower template. Multiple lower pads are spaced apart on the top surface of the lower support plate, and their top surfaces are connected to the lower mold base. The lower backing plate is located on the top surface of the lower mold base. The top of the lower mold base is provided with a spring and a positioning pin. The lower backing plate has multiple through holes. The springs pass through the through holes and extend upwards to connect to the lower ejector plate. The positioning pins pass through the lower backing plate and extend upwards. The lower ejector plate is slidably fitted onto the positioning pin. The top surface of the lower ejector plate has a through cavity. The lower template is located on the top surface of the lower backing plate and slidably connected within the cavity.

[0008] Preferably, the bottom surface of the upper mold base is provided with a plurality of spring holes, the spring holes are aligned with the axis of the through holes, and the top of the spring is connected to the top of the spring holes.

[0009] Preferably, the upper stripping plate includes an upper stripping plate, a first forming insert, and a second forming insert, wherein the first forming insert and the second forming insert are embedded in the bottom surface of the upper stripping plate.

[0010] Preferably, the plate also includes spring pins, a plurality of which are disposed at the bottom of the upper stripper plate, with their telescopic ends extending out of the bottom surface of the upper stripper plate.

[0011] Preferably, the lower template includes a lower punch and lower die inserts. The lower punch is disposed on the top surface of the lower pad, and four lower die inserts are embedded on the top of the lower punch. The top surface of the lower die inserts is provided with a material discharge through hole.

[0012] Preferably, the top surface of the lower mold base is provided with multiple guide pillars, and the upper pad, upper die and lower ejector plate are provided with guide sleeve holes for the guide pillars to slide.

[0013] Preferably, the bottom surface of the upper mold base is provided with multiple upper limit posts, and the top surface of the lower mold base is provided with multiple lower limit posts, with the upper limit posts directly opposite the lower limit posts.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Set up a blanking and punching compound die. For sheet metal parts that have both forming and through-hole features, the blanking, forming and punching are completed simultaneously, and multiple processes are combined into one process. For sheet metal parts, the number of positioning and punching times is reduced, and there is no need to add a shaping process. This avoids the cumulative error in dimensional accuracy caused by multiple positioning, improves the positional accuracy of the hole relative to the shape of the part, and improves the material utilization rate by concentrating the processes and reducing scrap.

[0016] 2. The upper stripper plate adopts a separable structure that combines the upper stripper plate with forming insert one and forming insert two, which allows forming insert one and forming insert two to be made of materials with higher hardness, and at the same time facilitates installation and maintenance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of a blanking and punching composite die based on strip forming according to the present invention;

[0019] Figure 2 This is a cross-sectional structural diagram of a blanking and punching composite die based on strip forming according to the present invention.

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure of the lower mold of this utility model;

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of the upper mold of this utility model;

[0022] Figure 5 This is a three-dimensional structural diagram of the upper mold base of this utility model;

[0023] Reference numerals: 1. Spring hole; 2. Lower support plate; 3. Lower pad; 4. Lower die base; 5. Lower backing plate; 6. Lower stripper plate; 7. Lower punch; 8. Upper die; 9. Upper stripper plate; 10. Upper backing plate; 11. Upper die base; 12. Locating pin; 13. Spring; 14. Punch; 15. Fixing bolt; 16. Forming insert one; 17. Forming insert two; 18. Guide post; 19. Upper limit post; 20. Lower limit post; 21. Lower die sleeve; 22. Blanking through hole; 23. Guide sleeve hole; 24. Spring pin; 25. Countersunk hole. Detailed Implementation

[0024] To better understand the technical content of this utility model, a specific embodiment is provided below, and the utility model will be further described in conjunction with the accompanying drawings.

[0025] See Figures 1 to 5This utility model provides a blanking and punching composite die based on strip forming, including an upper die mechanism and a lower die mechanism. The upper die mechanism includes an upper die base 11, an upper pad plate 10, an upper die cavity 8, and an upper ejector plate. The upper pad plate 10 and the upper die cavity 8 are sequentially connected to the bottom surface of the upper die base 11. The bottom surface of the upper die cavity 8 is provided with a through cavity. The upper ejector plate is slidably disposed in the cavity and has a spring 13 on its top surface. The upper pad plate 10 is provided with a through hole. The spring 13 passes through the through hole and is connected to the upper die base 11. The top of the upper die base 11 is provided with a countersunk hole 25. A fixing bolt 15 is slidably disposed in the countersunk hole 25. Its bottom passes through the upper pad plate 10 and is fixedly connected to the upper ejector plate. The top surface of the upper pad plate 10 is provided with a punch 14. The upper ejector plate is provided with a through hole for the punch 14 to slide.

[0026] The lower mold mechanism includes a lower support plate 2, lower pads 3, a lower mold base 4, a lower pad plate 5, a lower ejector plate 6, and a lower template. Multiple lower pads 3 are spaced apart on the top surface of the lower support plate 2, and their top surfaces are connected to the lower mold base 4. The lower pad plate 5 is located on the top surface of the lower mold base 4. The top of the lower mold base 4 is provided with a spring 13 and a positioning pin 12. The lower pad plate 5 has multiple through holes. The spring 13 passes through the through holes and extends upwards to connect to the lower ejector plate 6. The positioning pin 12 passes through the lower pad plate 5 and extends upwards. The lower ejector plate 6 is slidably sleeved on the positioning pin 12. The top surface of the lower ejector plate 6 has a through cavity. The lower template is located on the top surface of the lower pad plate 5 and slidably connected within the cavity.

[0027] Specifically, when the compound die performs forming and stamping operations, the material plate is first placed on the top surface of the lower ejector plate 6. The upper die holder 11 is installed on the hydraulic press worktable. The worktable drives the upper die holder 11 to press down. As the upper die mechanism descends, the upper die 8 descends and abuts against the top surface of the material plate. The upper die 8 presses down on the material plate and continues to descend. The bottom surface of the material plate is restricted by the lower die plate. As the upper die 8 descends, the material plate is punched into the shape of the forming cavity. Then the upper die 8 continues to descend, and the upper ejector plate and the lower die plate close. As the upper die 8 continues to descend, the lower die plate... The upper ejector plate is pushed upward relative to the upper die 8, compressing the spring 13. The fixing bolt 15 rises away from the bottom surface of the countersunk hole 25 and moves upward along the countersunk hole 25. When the top surface of the upper ejector plate abuts against the bottom surface of the upper pad 10, the upper ejector plate and the lower die plate press the blanked material plate together and complete the forming. Finally, as the upper die 8 descends and abuts against the lower pad 5, the upper ejector plate moves upward relative to the punch 14. The punch 14 punches holes in the formed material plate. After punching, the hydraulic press is started to drive the upper die holder 11 to rise and complete the reset. The blanking, stamping, and punching of the material plate are all completed in one station, avoiding the cumulative error in dimensional accuracy caused by multiple positioning, resulting in high processing accuracy.

[0028] Preferably, the bottom surface of the upper mold base 11 is provided with a plurality of spring holes 1, the spring holes 1 coincide with the axis of the through hole, and the top of the spring 13 is connected to the top of the spring hole 1.

[0029] When the compound mold is working, the punch press drives the upper mold base 11 to move downward, the upper stripper plate 9 and the lower punch 7 close the mold, and the spring 13 is compressed in the spring hole 1 to provide forming punching force. The spring hole 1 is set so that the axis coincides with the through hole. The spring 13 is installed in the spring hole 1. The elastic force direction of the spring 13 is consistent with the movement direction of the upper stripper plate 9, so the force is evenly distributed, avoiding uneven load, improving the life of the spring 13 and the accuracy of the mold.

[0030] Preferably, the upper stripping plate includes an upper stripping plate 9, a first forming insert 16, and a second forming insert 17, wherein the first forming insert 16 and the second forming insert 17 are embedded in the bottom surface of the upper stripping plate 9.

[0031] When the compound mold is working, the punch press drives the upper mold base 11 to move downward. As the upper stripper plate 9 in the upper stripper plate descends, forming insert 16 and forming insert 2 17 first contact the material sheet and press it against the top surface of the lower mold plate. Forming insert 16 and forming insert 2 17 are subjected to the greatest force. Forming insert 16 and forming insert 2 17 are installed on the bottom surface of the upper stripper plate 9 by embedding. This separate design allows forming insert 16 and forming insert 2 17 to be made of materials with higher hardness, and also facilitates installation and maintenance.

[0032] Preferably, the upper stripper plate 9 is also provided with spring pins 24, and a plurality of spring pins 24 are provided at the bottom of the upper stripper plate 9, with their telescopic ends extending out of the bottom surface of the upper stripper plate 9.

[0033] After the compound mold completes the punching process on the material plate, as the upper mold base 11 moves upward, the elastic potential energy of the spring pin 24 is released, pushing the upper stripper plate 9 to push the stamped sheet metal part out from the forming insert 16 and forming insert 27. The ejection force of the spring pin 24 can overcome the friction between the forming insert 16 and forming insert 27 and the sheet metal, thus avoiding jamming.

[0034] Preferably, the lower template includes a lower punch 7 and a lower die insert 21. The lower punch 7 is disposed on the top surface of the lower pad 5, and four lower die inserts 21 are embedded on the top of the lower punch 7. The top surface of the lower die insert 21 is provided with a material discharge through hole 22.

[0035] When punching the material plate, the punch 14 moves downward to punch the inner hole of the material sheet, and the waste material is discharged from the bottom through the blanking hole 22 to the lower die sleeve 21. The lower die sleeve 21 can be disassembled independently. When a lower die sleeve 21 is worn and needs to be replaced, only the corresponding lower die sleeve 21 needs to be replaced, without replacing the entire lower punch 7, which greatly shortens the maintenance time.

[0036] Preferably, the top surface of the lower mold base 4 is provided with a plurality of guide posts 18, and the upper pad 10, the upper die 8 and the lower ejector plate 6 are provided with guide sleeve holes 23 for sliding of the guide posts 18.

[0037] Understandably, the upper backing plate 10, the upper die 8, and the lower stripper plate 6 are provided with guide sleeve holes 23, which are fitted onto the guide post 18 through clearance fit or rolling bearings to ensure that the guide post 18 moves along the axis of the guide post 18 during stamping. The guide post 18 is the core guiding component of the mold, which undertakes the functions of precise alignment between the upper and lower molds and vertical guidance of moving parts.

[0038] Preferably, the bottom surface of the upper mold base 11 is provided with a plurality of upper limit posts 19, and the top surface of the lower mold base 4 is provided with a plurality of lower limit posts 20, with the upper limit posts 19 directly opposite the lower limit posts 20.

[0039] When the punch press drives the upper die holder 11 to descend, the upper limit post 19 descends synchronously with the upper die holder 11. When the upper die holder 11 and the lower die holder 4 are closed to the set stroke, the lower end face of the upper limit post 19 contacts the upper end face of the lower limit post 20, preventing the upper die from continuing to descend, thereby limiting the stamping depth and preventing overpressure caused by slide overtravel or sheet thickness deviation, which could damage the lower punch body 7, forming insert 16 and forming insert 2 17.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A blanking and punching compound die based on strip forming, characterized in that, The device includes an upper mold mechanism and a lower mold mechanism. The upper mold mechanism includes an upper mold base, an upper backing plate, an upper die, and an upper ejector plate. The upper backing plate and the upper die are sequentially connected to the bottom surface of the upper mold base. The bottom surface of the upper die has a through cavity. The upper ejector plate is slidably disposed in the cavity and has a spring on its top surface. The upper backing plate has a through hole, and the spring passes through the through hole and is connected to the upper mold base. The top of the upper mold base has a countersunk hole, and a fixing bolt is slidably disposed in the countersunk hole. Its bottom passes through the upper backing plate and is fixedly connected to the upper ejector plate. The top surface of the upper backing plate has a punch, and the upper ejector plate has a through hole for the punch to slide. The lower mold mechanism includes a lower support plate, lower pads, a lower mold base, a lower backing plate, a lower ejector plate, and a lower template. Multiple lower pads are spaced apart on the top surface of the lower support plate, and their top surfaces are connected to the lower mold base. The lower backing plate is located on the top surface of the lower mold base. The top of the lower mold base is provided with a spring and a positioning pin. The lower backing plate has multiple through holes. The springs pass through the through holes and extend upwards to connect to the lower ejector plate. The positioning pins pass through the lower backing plate and extend upwards. The lower ejector plate is slidably fitted onto the positioning pin. The top surface of the lower ejector plate has a through cavity. The lower template is located on the top surface of the lower backing plate and slidably connected within the cavity.

2. The blanking and punching compound die based on strip forming according to claim 1, characterized in that, The bottom surface of the upper mold base is provided with multiple spring holes, the spring holes coincide with the axis of the through holes, and the top of the spring is connected to the top of the spring hole.

3. The blanking and punching compound die based on strip forming according to claim 1, characterized in that, The upper stripping plate includes an upper stripping plate, a first forming insert, and a second forming insert, which are embedded in the bottom surface of the upper stripping plate.

4. A blanking and punching composite die based on strip forming according to claim 3, characterized in that, It also includes spring pins, a plurality of which are located at the bottom of the upper stripper plate, with their telescopic ends extending out of the bottom surface of the upper stripper plate.

5. A blanking and punching composite die based on strip forming according to claim 1, characterized in that, The lower template includes a lower punch and lower die inserts. The lower punch is located on the top surface of the lower pad, and four lower die inserts are embedded on the top of the lower punch. The top surface of the lower die inserts is provided with a material discharge through hole.

6. A blanking and punching compound die based on strip forming according to claim 1, characterized in that, The top surface of the lower mold base is provided with multiple guide pillars, and the upper pad, upper die and lower ejector plate are provided with guide sleeve holes for the guide pillars to slide.

7. A blanking and punching compound die based on strip forming according to claim 1, characterized in that, The bottom surface of the upper mold base is provided with multiple upper limit posts, and the top surface of the lower mold base is provided with multiple lower limit posts, with the upper limit posts directly opposite the lower limit posts.

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