Multi-step combined stamping forming mold core assembly and stamping die

Abstract

The application provides a multi-step combined stamping forming die core assembly and a stamping die. The multi-step combined stamping forming die core assembly comprises a first step die core and a second step die core. The first step die core comprises a first step upper die head and a first step lower die head arranged correspondingly, and the first step upper die head is provided with an annular groove and a plurality of point position grooves in communication. The plurality of point position grooves are circumferentially distributed on the bottom of the annular groove, the annular groove is used for forming an annular pre-bulge on the upper end surface of a to-be-stamped part, and the plurality of point position grooves are used for forming a plurality of point position pre-bulges on the upper end surface of the to-be-stamped part. The second step die core comprises a second step upper die head and a second step lower die head arranged correspondingly, and the second step upper die head is formed with a flat pressing end surface. The metal of the annular pre-bulge and the plurality of point position pre-bulges is correspondingly pressed into the second T-shaped ring groove and the plurality of second side notches by using the flat pressing end surface, so that the deformation and depression of the upper disc end surface are effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, and in particular to a multi-step combined stamping forming die core assembly and a stamping die. Background Technology

[0002] Battery terminal components in new energy are the core components that enable electrical connections between individual cells within a battery pack, and their physical characteristics directly affect the performance of the battery system.

[0003] like Figure 1 The battery terminal fitting 1 shown includes an upper disc 11 and a lower ring 12 connected to each other. The upper disc 11 and the lower ring 12 are provided with a through hole 13 in the middle. Multiple snap-fit ​​protrusions 14 are evenly distributed on the outer side wall of the lower ring 12. The battery terminal fitting is a thin structure. Specifically, the maximum wall thickness of the upper disc 11 is required to be 1.2 mm, the maximum wall thickness of the lower ring 12 is required to be 0.7 mm, the maximum protrusion thickness of the snap-fit ​​protrusions 14 is required to be 0.3 mm, the allowable dimensional error is ±0.05 mm, and the end face of the upper disc 11 is required to have no obvious dents and a high degree of flatness. Obviously, the existing one-time stamping process cannot meet the above flatness and dimensional requirements. This is because when using metal strip for stamping, in order to form the lower ring 12, the flat metal strip will undergo metal deformation extension or deformation transfer downward, resulting in deformation and depression on the upper end face of the metal strip, which makes it impossible to form the upper disc 11 and meet the flatness requirements of the end face of the upper disc 11. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-step combined stamping forming die core assembly and stamping mold that can ensure sufficient metal deformation transfer of the upper disk during the dimensional forming process and effectively avoid deformation depression on the end face of the upper disk.

[0005] The objective of this utility model is achieved through the following technical solution: A multi-step combined stamping forming die core assembly is used to pre-form a part to be stamped on a metal strip and connected to the metal strip. The multi-step combined stamping forming die core assembly includes a punching die core group, which is used to punch the part to be stamped to form a central inner hole on the part to be stamped. The multi-step combined stamping forming die core assembly further includes: The first step die core includes a first step upper die head and a first step lower die head. The first step upper die head has a connected annular groove and multiple point grooves. The multiple point grooves are circumferentially distributed at the bottom of the annular groove. The annular groove is used to form an annular pre-protrusion on the upper end face of the part to be stamped. The multiple point grooves are used to form multiple point pre-protrusions on the upper end face of the part to be stamped. The first step lower die head has a connected first T-shaped annular groove and multiple first side slots. The first T-shaped annular groove is used to form an upper disk and a lower ring. The multiple first side slots are correspondingly arranged with the multiple point grooves. Each first side slot is used to form a snap-fit ​​protrusion. After stamping, the annular pre-protrusion and the multiple point pre-protrusions protrude from the upper disk, and the annular pre-protrusion is located on the projection surface of the lower ring. Each snap-fit ​​protrusion is located on the projection surface of the corresponding snap-fit ​​protrusion. The second step die core includes a correspondingly arranged second step upper die head and a second step lower die head; the second step upper die head has a flat pressure end face; the second step lower die head has a connected second T-shaped annular groove and a plurality of second side slots, the second T-shaped annular groove is used to shape the size of the upper disc and the lower annular ring, the plurality of second side slots are correspondingly arranged with a plurality of snap-fit ​​protrusions, and each second side slot is used to shape the size of the corresponding snap-fit ​​protrusion.

[0006] In one embodiment, the first step lower die head includes a first pre-formed die core sleeve, a first pre-formed punch, and a first pre-formed ejection sleeve; the first pre-formed die core sleeve is sleeved on the first pre-formed ejection sleeve, the first pre-formed ejection sleeve is sleeved on the first pre-formed punch, the first pre-formed die core sleeve, the first pre-formed punch, and the first pre-formed ejection sleeve together form the first T-shaped annular groove, and a plurality of the first side slots are located on the first pre-formed die core sleeve.

[0007] In one embodiment, the first step lower die head further includes a first base plate, which is disposed at the bottom of the first preform die core sleeve, and the end of the first preform punch facing away from the forming end passes through the bottom of the first preform die core sleeve and is screwed to the first base plate.

[0008] In one embodiment, the second step die head includes a second shaping die core sleeve, a second shaping punch, and a second shaping ejection sleeve; the second shaping die core sleeve is sleeved on the second shaping ejection sleeve, the second shaping ejection sleeve is sleeved on the second shaping punch, the second shaping die core sleeve, the second shaping punch, and the second shaping ejection sleeve together form the second T-shaped annular groove, and a plurality of the second side slots are located on the second shaping die core sleeve.

[0009] In one embodiment, the second step die head further includes a second base plate, which is disposed at the bottom of the second forming die core sleeve, and one end of the second forming punch away from the forming end passes through the bottom of the second forming die core sleeve and is screwed to the second base plate.

[0010] In one embodiment, both the first step upper die head and the second step upper die head are integrally formed structures.

[0011] In one embodiment, the first preformed mold core sleeve, the first preformed punch, the first preformed ejector sleeve, the second shaping mold core sleeve, the second shaping punch, and the second shaping ejector sleeve are all integrally formed structures.

[0012] A stamping die includes an upper die base, a lower die base, and a multi-step combined stamping forming die core assembly as described in any of the above embodiments. The first step upper die head and the second step upper die head are fixedly installed on the upper die base, and the first step lower die head and the second step lower die head are fixedly installed on the lower die base.

[0013] In one embodiment, the stamping die further includes a first ejection mechanism, which includes a first mounting base, a first slider, a first elastic element, and at least two first ejection connecting rods. The first mounting base is screwed to the bottom of the lower die base. The first mounting base has a first sliding hole and a first positioning hole that are connected. The first slider is slidably disposed in the first sliding hole. The first elastic element is disposed in the first positioning hole and elastically abuts against the first slider. One end of the two first ejection connecting rods is connected to the first slider. The other ends of the two first ejection connecting rods slide sequentially through the lower die base and the first base plate and are connected to the first pre-formed ejection sleeve.

[0014] In one embodiment, the stamping die further includes a second ejection mechanism, which includes a second mounting base, a second slider, a second elastic element, and at least two second ejection connecting rods. The second mounting base is screwed to the bottom of the lower die base. The second mounting base has a communicating second sliding hole and a second positioning hole. The second slider is slidably disposed in the second sliding hole. The second elastic element is disposed in the second positioning hole and elastically abuts against the second slider. One end of each of the two second ejection connecting rods is connected to the second slider. The other ends of the two second ejection connecting rods slide sequentially through the lower die base and the second base plate and are connected to the second forming ejection sleeve.

[0015] Compared with the prior art, the present invention has at least the following advantages: The upper disk and lower ring are formed by stamping with the upper and lower dies in the first step. Specifically, the annular pre-protrusion and multiple point pre-protrusions protrude from the upper disk. Since the annular pre-protrusion is located on the projection surface of the lower ring, and each snap-fit ​​protrusion is located on the projection surface of its corresponding snap-fit ​​protrusion, the metal of the annular pre-protrusion and multiple point pre-protrusions is pressed into the second T-shaped annular groove and multiple second side slots using the flat pressing end face. That is, the upper disk, lower ring, and multiple snap-fit ​​protrusions are saturated and dimensionally shaped using the second T-shaped annular groove and multiple second side slots. In this way, when forming the upper disk and lower ring, sufficient metal deformation transfer is ensured during the dimensional shaping process of the upper disk, effectively avoiding deformation and depression on the end face of the upper disk, meeting the flatness requirements of the upper disk end face, and better meeting other dimensional requirements. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural diagram of a battery terminal component; Figure 2 A cross-sectional view of the battery terminal fittings; Figure 3 A schematic diagram of the punching die core assembly and metal strip. Figure 4 This is a schematic diagram of the structure of a multi-step combined stamping die core assembly in one embodiment; Figure 5 for Figure 4 The diagram shows a partial structural schematic of a multi-step combined stamping die core assembly. Figure 6 for Figure 4 A cross-sectional view of the multi-step combined stamping die core assembly shown. Figure 7 This is a schematic diagram of the first ejection mechanism and the second ejection mechanism of a stamping die in one embodiment; Figure 8 This is a schematic diagram of the structure of a stamping die in one embodiment; Figure 9 This is a picture of the actual battery terminal accessories; Figure 10 This is a picture of the actual battery terminal accessories; Reference numerals: Multi-step combined stamping forming die core assembly 10; Battery terminal accessory 1; Upper disc 11; Annular pre-protrusion 111; Point pre-protrusion 112; Lower ring 12; Through hole 13; Snap-fit ​​protrusion 14; Metal strip 2; Part to be stamped 21; First central inner hole 22; Punching die core 100; First step die core 200; First step upper die head 210; Annular groove 2101; Point groove 2102; First step lower die head 220; First T-shaped annular groove 2201; First side groove 2202; First pre-formed die core sleeve 2210; First pre-formed punch 2220; First pre-formed ejector sleeve 2230; First base plate 2240; Second step die core 300; Second step upper die Head 310; Flat pressing end face 3110; Second step lower die head 320; Second T-shaped annular groove 3201; Second side groove 3202; Second forming die core sleeve 3220; Second forming punch 3230; Second forming ejector sleeve 3240; Second base plate 3250; Upper die holder 400; Lower die holder 500; First ejection mechanism 600; First mounting seat 610; First sliding hole 6101; First positioning hole 6102; First slider 620; First elastic element 630; First ejection connecting rod 640; Second ejection mechanism 700; Second mounting seat 710; Second sliding hole 7101; Second positioning hole 7102; Second slider 720; Second elastic element 730; Second ejection connecting rod 740. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Please see Figures 1 to 6 To better understand the multi-step combined stamping forming die core assembly 10 of this application, the following further explanation of the multi-step combined stamping forming die core assembly 10 is provided: One embodiment of the multi-step combined stamping die core assembly 10 is used to pre-form a stamping portion 21 connected to the metal strip 2 on the metal strip 2. The multi-step combined stamping die core assembly 10 includes a punching die core group 100, which is used to punch the stamping portion 21 to form a central inner hole 22 on the stamping portion 21. The multi-step combined stamping die core assembly 10 also includes a first step die core 200 and a second step die core 300. The first step die core 200 includes a first step upper die head 210 and a first step lower die head 220. The first step upper die head 210 has a connected annular groove 2101 and a plurality of point grooves 2102. The plurality of point grooves 2102 are circumferentially distributed at the bottom of the annular groove 2101. The annular groove 2101 is used to form an annular pre-protrusion 111 on the upper end face of the part to be stamped 21, and the plurality of point grooves 2102 are used to form a plurality of point pre-protrusions 112 on the upper end face of the part to be stamped 21. The first step lower die head 220 has a connected first T-shaped annular groove 2201 and a plurality of first side slots 2202. The first T-shaped annular groove 2201 is used to form an upper disc 11 and a lower ring 12. The plurality of first side slots 2202 are correspondingly arranged with the plurality of point grooves 2102. Each first side slot 2202 is used to form a card. The connecting protrusion 14, wherein, after stamping, the annular pre-protrusion 111 and the plurality of point pre-protrusions 112 all protrude from the upper disk 11, and the annular pre-protrusion 111 is located on the projection surface of the lower ring 12, and each of the snap-fit ​​protrusions 14 is located on the projection surface of the corresponding snap-fit ​​protrusion 14; the second step die core 300 includes a correspondingly arranged second step upper die head 310 and a second step lower die head 320; the second step upper die head 310 forms a flat pressing end face 3110; the second step lower die head 320 has a connected second T-shaped annular groove 3201 and a plurality of second side slots 3202, the second T-shaped annular groove 3201 is used to shape the size of the upper disk 11 and the lower ring 12, and the plurality of second side slots 3202 are correspondingly arranged with the plurality of snap-fit ​​protrusions 14, and each second side slot 3202 is used to shape the size of the corresponding snap-fit ​​protrusion 14.

[0022] In this embodiment, the upper disk 11 and the lower ring 12 are obtained by stamping through the upper die head 210 and the lower die head 220 in the first step. Specifically, the annular pre-protrusion 111 and the multiple point pre-protrusions 112 protrude from the upper disk 11. Since the annular pre-protrusion 111 is located on the projection surface of the lower ring 12, and each snap-fit ​​protrusion 14 is located on the projection surface of the corresponding snap-fit ​​protrusion 14, the metal of the annular pre-protrusion 111 and the multiple point pre-protrusions 112 are pressed into the second T-shaped annular groove 3201 and the multiple second side grooves 3202 by the stamping through the upper die head 310 and the lower die head 320 in the second step. Specifically, the metal of the annular pre-protrusion 111 and the multiple point pre-protrusions 112 is pressed into the second T-shaped annular groove 3201 and the multiple second side grooves 3202 by the flat pressing end face 3110. That is, the upper disk 11, the lower ring 12 and the multiple snap-fit ​​protrusions 14 are saturated and dimensionally shaped by the second T-shaped annular groove 3201 and the multiple second side grooves 3202. Thus, during the forming of the upper disk 11 and the lower ring 12, sufficient metal deformation transfer is ensured in the upper disk 11 during the dimensional shaping process, effectively avoiding deformation and depression on the end face of the upper disk 11, meeting the flatness requirements of the end face of the upper disk 11, and better meeting other dimensional requirements.

[0023] like Figures 4 to 6 As shown, in one embodiment, the first step lower die head 220 includes a first pre-formed die core sleeve 2210, a first pre-formed punch 2220, and a first pre-formed ejection sleeve 2230; the first pre-formed die core sleeve 2210 is disposed on the first pre-formed ejection sleeve 2230, the first pre-formed ejection sleeve 2230 is sleeved on the first pre-formed punch 2220, the first pre-formed die core sleeve 2210, the first pre-formed punch 2220 and the first pre-formed ejection sleeve 2230 together form the first T-shaped annular groove 2201, and a plurality of first side slots 2202 are all located on the first pre-formed die core sleeve 2210.

[0024] It is understood that in this embodiment, the cross-section of the first T-shaped annular groove 2201 is T-shaped. The overall outline shape of the upper disk 11 and the lower ring 12 is pre-formed using the first T-shaped annular groove 2201. At this time, the upper disk 11 and the lower ring 12 may have insufficient shape saturation or substandard size. Specifically, after the stamping action of the lower die head 220 in the first step is completed, the corresponding annular pre-protrusion 111 and the corresponding snap-fit ​​protrusion 14 are mainly formed using the annular groove 2101 and multiple point grooves 2102, so as to provide a sufficient amount of deformable and transferable metal part for the subsequent stamping of the die core 300 in the second step.

[0025] It should be noted that the annular pre-protrusion 111 is located on the projection surface of the lower ring 12, and each snap-fit ​​protrusion 14 is located on the projection surface of the corresponding snap-fit ​​protrusion 14. The aforementioned projection surface is a plane in the direction of the stamping action perpendicular to the upper die head 210 of the first step or the upper die head 310 of the second step.

[0026] like Figures 1 to 6 As shown, in one embodiment, the first step die head 220 further includes a first base plate 2240, which is disposed at the bottom of the first preform die core sleeve 2210. The end of the first preform punch 2220 facing away from the forming end passes through the bottom of the first preform die core sleeve 2210 and is screwed to the first base plate 2240. This allows the first step die head 220 to adopt a split-type structural design, facilitating the individual processing and manufacturing of the first preform die core sleeve 2210, the first preform punch 2220, and the first preform ejection sleeve 2230, thereby improving the processing accuracy of each component. Specifically, after the stamping and forming action of the first step die head 220 is completed, the first preform ejection sleeve 2230 slides relative to the first preform die core sleeve 2210 and the first preform punch 2220 respectively, to push the formed upper disc 11 and lower ring 12 upward out of the first T-shaped annular groove 2201.

[0027] like Figures 1 to 6 As shown, in one embodiment, the second step die head 320 includes a second forming die core sleeve 3220, a second forming punch 3230, and a second forming ejection sleeve 3240; the second forming die core sleeve 3220 is disposed on the second forming ejection sleeve 3240, the second forming ejection sleeve 3240 is sleeved on the second forming punch 3230, the second forming die core sleeve 3220, the second forming punch 3230 and the second forming ejection sleeve 3240 together form the second T-shaped annular groove 3201, and a plurality of second side slots 3202 are located on the second forming die core sleeve 3220.

[0028] It is understood that in this embodiment, the cross-section of the second T-shaped annular groove 3201 is T-shaped. The overall shape of the upper disk 11 and lower ring 12 pre-formed by the first step mold core 200 is stamped and shaped using the flat pressing end face 3110 and the second T-shaped annular groove 3201. The metal of the annular pre-protrusion 111 and the multiple point pre-protrusions 112 are pressed into the second T-shaped annular groove 3201 and the multiple second side slots 3202. That is, the second T-shaped annular groove 3201 and the multiple second side slots 3202 are used to saturate and shape the upper disk 11, lower ring 12 and multiple snap-fit ​​protrusions 14 to ensure that the forming shape of each part of the battery terminal accessory is saturated and the size meets the standard. Specifically, after the stamping action of the lower die head 320 in the second step is completed, the second shaping ejector sleeve 3240 slides relative to the second pre-shaped die core sleeve and the second pre-shaped punch respectively, so as to push the shaped upper disc 11 and lower ring 12 upward out of the second T-shaped ring groove 3201.

[0029] like Figure 6 As shown, in one embodiment, the second step die head 320 further includes a second base plate 3250, which is disposed at the bottom of the second forming die core sleeve 3220. The end of the second forming punch 3230 facing away from the forming end passes through the bottom of the second forming die core sleeve 3220 and is screwed to the second base plate 3250. This allows the second step die head 320 to adopt a split-type structural design, facilitating the individual processing and manufacturing of the second forming die core sleeve 3220, the second forming punch 3230, and the second forming ejector sleeve 3240, thereby improving the processing accuracy of each component. Specifically, after the stamping and forming action of the second step die head 320 is completed, the second forming ejector sleeve 3240 slides relative to the second forming die core sleeve 3220 and the second forming punch 3230 respectively, to eject the shaped upper disc 11 and lower ring 12 upwards out of the second T-shaped annular groove 3201.

[0030] like Figures 4 to 6 As shown, in one embodiment, both the first step upper die 210 and the second step upper die 310 are integrally formed structures. This ensures that the first step upper die 210 and the second step upper die 310 have good structural strength, allowing the annular groove 2101 to form an annular pre-protrusion 111 during the stamping process. The flat pressing end face 3110 can reliably press the metal of the annular pre-protrusion 111 and the multiple point pre-protrusions 112 into the second T-shaped annular groove 3201 and the multiple second side slots 3202.

[0031] like Figures 4 to 6As shown, in one embodiment, the first preform die sleeve 2210, the first preform punch 2220, the first preform ejector sleeve 2230, the second shaping die sleeve 3220, the second shaping punch 3230, and the second shaping ejector sleeve 3240 are all integrally formed structures. This ensures that the above components have good structural strength to complete the preforming and shaping operations of the upper disc 11 and the lower ring 12.

[0032] Please see Figures 1 to 8 This application also provides a stamping die, including an upper die holder 400, a lower die holder 500, and a multi-step combined stamping forming die core assembly 10 as described in any of the above embodiments. The first step upper die head 210 and the second step upper die head 310 are fixedly installed on the upper die holder 400, and the first step lower die head 220 and the second step lower die head 320 are fixedly installed on the lower die holder 500.

[0033] In this embodiment, the stamping die adopts the aforementioned multi-step combined stamping forming die core assembly 10, enabling the stamping die to obtain the upper disk 11 and the lower ring 12 through the stamping forming of the first step upper die head 210 and the first step lower die head 220. Specifically, the annular pre-protrusion 111 and multiple point pre-protrusions 112 all protrude from the upper disk 11. Furthermore, since the annular pre-protrusion 111 is located on the projection surface of the lower ring 12, and each snap-fit ​​protrusion 14 is located on the corresponding snap-fit ​​protrusion 1 On the projection surface of 4, the upper die head 310 and the lower die head 320 of the second step are used for stamping. Specifically, the metal of the annular pre-protrusion 111 and the multiple point pre-protrusions 112 are pressed into the second T-shaped annular groove 3201 and the multiple second side grooves 3202 by the flat pressing end face 3110. That is, the upper disk 11, the lower ring 12 and the multiple second side grooves 3202 are saturated and dimensionally shaped by the second T-shaped annular groove 3201 and the multiple second side grooves 3202. In this way, when forming the upper disk 11 and the lower ring 12, it is ensured that the upper disk 11 has sufficient metal deformation transfer during the dimensional shaping process, effectively avoiding the deformation and depression of the end face of the upper disk 11, meeting the flatness requirements of the end face of the upper disk 11 and better meeting other dimensional requirements.

[0034] like Figures 6 to 8As shown, in one embodiment, the stamping die further includes a first ejection mechanism 600, which includes a first mounting base 610, a first slider 620, a first elastic element 630, and at least two first ejection connecting rods 640. The first mounting base 610 is screwed to the bottom of the lower die base 500. The first mounting base 610 has a first sliding hole 6101 and a first positioning hole 6102 that are connected. The first slider 620 is slidably disposed in the first sliding hole 6101. The first elastic element 630 is disposed in the first positioning hole 6102 and elastically abuts against the first slider 620. One end of the two first ejection connecting rods 640 is connected to the first slider 620, and the other end of the two first ejection connecting rods 640 slides through the lower die base 500 and the first base plate 2240 in sequence, and is connected to the first pre-formed ejection sleeve 2230.

[0035] It is understood that the first positioning hole 6102 is used to limit the movement of the first elastic member 630 and make the first elastic member 630 elastically abut against the first slider 620. Since one end of the first ejection link 640 is connected to the first slider 620, the other end of the first ejection link 640 can provide ejection thrust to the first pre-shaped ejection sleeve 2230. This ensures that after the stamping action of the lower die head 220 in the first step is completed, the first pre-shaped ejection sleeve 2230 slides relative to the first pre-shaped die core sleeve 2210 and the first pre-shaped punch 2220 respectively, so as to push the formed upper disc 11 and lower ring 12 upward out of the first T-shaped ring groove 2201.

[0036] like Figures 6 to 8 As shown, in one embodiment, the stamping die further includes a second ejection mechanism 700, which includes a second mounting base 710, a second slider 720, a second elastic element 730, and at least two second ejection connecting rods 740. The second mounting base 710 is screwed to the bottom of the lower die base 500. The second mounting base 710 has a communicating second sliding hole 7101 and a second positioning hole 7102. The second slider 720 is slidably disposed in the second sliding hole 7101. The second elastic element 730 is disposed in the second positioning hole 7102 and elastically abuts against the second slider 720. One end of each of the two second ejection connecting rods 740 is connected to the second slider 720, and the other end of each of the two second ejection connecting rods 740 slides through the lower die base 500 and the second base plate 3250 in sequence, and is connected to the second shaping ejection sleeve 3240.

[0037] It is understood that the second positioning hole 7102 is used to limit the movement of the second elastic member 730 and make the second elastic member 730 elastically abut against the second slider 720. Since one end of the second ejection link 740 is connected to the second slider 720, the other end of the second ejection link 740 can provide ejection thrust to the second shaping ejection sleeve 3240. This ensures that after the stamping action of the lower die head 320 in the second step is completed, the second shaping ejection sleeve 3240 slides relative to the second pre-formed die core sleeve and the second pre-formed punch respectively, so as to push the shaped upper disc 11 and lower ring 12 upward out of the second T-shaped ring groove 3201.

[0038] Specifically, the first elastic element and the second elastic element can be springs or elastic rubber.

[0039] Compared with the prior art, the present invention has at least the following advantages: The upper disk and lower ring are formed by stamping with the upper and lower dies in the first step. Specifically, the annular pre-protrusion and multiple point pre-protrusions protrude from the upper disk. Since the annular pre-protrusion is located on the projection surface of the lower ring, and each snap-fit ​​protrusion is located on the projection surface of its corresponding snap-fit ​​protrusion, the metal of the annular pre-protrusion and multiple point pre-protrusions is pressed into the second T-shaped annular groove and multiple second side slots using the flat pressing end face. That is, the upper disk, lower ring, and multiple snap-fit ​​protrusions are saturated and dimensionally shaped using the second T-shaped annular groove and multiple second side slots. In this way, when forming the upper disk and lower ring, sufficient metal deformation transfer is ensured during the dimensional shaping process of the upper disk, effectively avoiding deformation and depression on the end face of the upper disk, meeting the flatness requirements of the upper disk end face, and better meeting other dimensional requirements.

[0040] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A multi-step combined stamping forming die core assembly, used to pre-form a part to be stamped on a metal strip and connected to the metal strip, the multi-step combined stamping forming die core assembly including a punching die core group, the punching die core group being used to punch the part to be stamped to form a central inner hole on the part to be stamped, characterized in that, The multi-step combined stamping die core assembly also includes: The first step die core includes a first step upper die head and a first step lower die head. The first step upper die head has a connected annular groove and multiple point grooves. The multiple point grooves are circumferentially distributed at the bottom of the annular groove. The annular groove is used to form an annular pre-protrusion on the upper end face of the part to be stamped. The multiple point grooves are used to form multiple point pre-protrusions on the upper end face of the part to be stamped. The first step lower die head has a connected first T-shaped annular groove and multiple first side slots. The first T-shaped annular groove is used to form an upper disk and a lower ring. The multiple first side slots are correspondingly arranged with the multiple point grooves. Each first side slot is used to form a snap-fit ​​protrusion. After stamping, the annular pre-protrusion and the multiple point pre-protrusions protrude from the upper disk, and the annular pre-protrusion is located on the projection surface of the lower ring. Each snap-fit ​​protrusion is located on the projection surface of the corresponding snap-fit ​​protrusion. The second step die core includes a correspondingly arranged second step upper die head and a second step lower die head; the second step upper die head has a flat pressure end face; the second step lower die head has a connected second T-shaped annular groove and a plurality of second side slots, the second T-shaped annular groove is used to shape the size of the upper disc and the lower annular ring, the plurality of second side slots are correspondingly arranged with a plurality of snap-fit ​​protrusions, and each second side slot is used to shape the size of the corresponding snap-fit ​​protrusion.

2. The multi-step combined stamping forming die core assembly according to claim 1, characterized in that, The first step of the die head includes a first pre-formed die core sleeve, a first pre-formed punch, and a first pre-formed ejection sleeve; the first pre-formed die core sleeve is sleeved on the first pre-formed ejection sleeve, the first pre-formed ejection sleeve is sleeved on the first pre-formed punch, the first pre-formed die core sleeve, the first pre-formed punch, and the first pre-formed ejection sleeve together form the first T-shaped annular groove, and a plurality of the first side slots are located on the first pre-formed die core sleeve.

3. The multi-step combined stamping forming die core assembly according to claim 2, characterized in that, The first step of the die head also includes a first base plate, which is located at the bottom of the first preform die core sleeve. The end of the first preform punch facing away from the forming end passes through the bottom of the first preform die core sleeve and is screwed to the first base plate.

4. The multi-step combined stamping forming die core assembly according to claim 3, characterized in that, The second step lower die head includes a second forming die core sleeve, a second forming punch, and a second forming ejector sleeve; The second shaping die core sleeve is fitted onto the second shaping ejector sleeve, and the second shaping ejector sleeve is fitted onto the second shaping punch. The second shaping die core sleeve, the second shaping punch, and the second shaping ejector sleeve together form the second T-shaped annular groove, and multiple second side slots are located on the second shaping die core sleeve.

5. The multi-step combined stamping forming die core assembly according to claim 4, characterized in that, The second step lower die head also includes a second base plate, which is located at the bottom of the second forming die core sleeve. One end of the second forming punch away from the forming end passes through the bottom of the second forming die core sleeve and is screwed to the second base plate.

6. The multi-step combined stamping forming die core assembly according to claim 1, characterized in that, Both the upper die head of the first step and the upper die head of the second step are integrally formed structures.

7. The multi-step combined stamping forming die core assembly according to claim 4, characterized in that, The first preform die core sleeve, the first preform punch, the first preform ejector sleeve, the second shaping die core sleeve, the second shaping punch, and the second shaping ejector sleeve are all integrally formed structures.

8. A stamping die, characterized in that, It includes an upper die base, a lower die base, and the multi-step combined stamping forming die core assembly as described in claim 5, wherein the first step upper die head and the second step upper die head are fixedly installed on the upper die base, and the first step lower die head and the second step lower die head are fixedly installed on the lower die base.

9. The stamping die according to claim 8, characterized in that, The stamping die further includes a first ejection mechanism, which includes a first mounting base, a first slider, a first elastic element, and at least two first ejection connecting rods. The first mounting base is screwed to the bottom of the lower die base. The first mounting base has a first sliding hole and a first positioning hole that are connected. The first slider is slidably disposed in the first sliding hole. The first elastic element is disposed in the first positioning hole and elastically abuts against the first slider. One end of the two first ejection connecting rods is connected to the first slider. The other ends of the two first ejection connecting rods slide sequentially through the lower die base and the first base plate and are connected to the first pre-formed ejection sleeve.

10. The stamping die according to claim 8, characterized in that, The stamping die further includes a second ejection mechanism, which includes a second mounting base, a second slider, a second elastic element, and at least two second ejection connecting rods. The second mounting base is screwed to the bottom of the lower die base. The second mounting base has a communicating second sliding hole and a second positioning hole. The second slider is slidably disposed in the second sliding hole. The second elastic element is disposed in the second positioning hole and elastically abuts against the second slider. One end of each of the two second ejection connecting rods is connected to the second slider. The other ends of the two second ejection connecting rods slide sequentially through the lower die base and the second base plate and are connected to the second forming ejection sleeve.

Images