A shrinking mold

Abstract

The utility model discloses a necking mold, comprising an upper mold and a lower mold which cooperate with each other, wherein the upper mold comprises an upper mold assembly, a punch assembly connected to the middle part of the lower end of the upper mold assembly, and a plurality of side push blocks distributed around the punch assembly; the punch assembly comprises a central punch elastically connected to the upper mold assembly, a plurality of first petal punches connected to the central punch and arranged at intervals around the central punch, a plurality of second petal punches which are arranged staggered with the first petal punches and distributed around the central punch, and a plurality of drive assemblies, wherein the plurality of first petal punches cooperate with the plurality of second petal punches to form a punch outer peripheral surface whose shape is matched with the shape of a workpiece, and the punch outer peripheral surface cooperates with the side push blocks to process the necking of the workpiece; the lower mold comprises a lower mold assembly, a concave cavity which is arranged on the lower mold assembly and cooperates with the punch assembly, and a plurality of drive mechanisms connected to the lower mold assembly; the mold workpiece can be easily demoulded, and the molded product can be conveniently taken out.

Description

Technical Field

[0001] The utility model belongs to the technical field of stamping dies, and in particular relates to a shrinking die. Background Art

[0002] Most sound-generating devices such as speakers, TVs, and radios are covered with speaker mesh covers to make them beautiful, dustproof, and safe. Metal speaker meshes usually require a stamping die to stamp out a constricted end at one end of the speaker mesh. The constricted end has a full-circle undercut. If traditional molds are used for processing, the undercut of the speaker mesh will be tightly fastened to the punch, making it difficult to demold the molded workpiece and take out the product. Utility Model Content

[0003] Aiming at the technical problem in the prior art that the necked end of the speaker mesh after stamping is formed with a full-circle undercut, which will be buckled on the punch, making it difficult to remove the formed workpiece, the utility model provides a necking die.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A necking mold, comprising:

[0006] An upper die, the upper die comprising an upper die assembly, a punch assembly connected to the middle of the lower end of the upper die assembly, and a plurality of side push blocks distributed around the punch assembly; the punch assembly comprises a central punch elastically connected to the upper die assembly, a plurality of first petal punches connected to the central punch and arranged at intervals around the central punch, a plurality of second petal punches arranged in an interlaced manner with the first petal punches and distributed around the central punch, and a plurality of drive assemblies, the plurality of first petal punches and the plurality of second petal punches cooperate with each other to form a peripheral surface of the punch having a shape that matches the shape of the workpiece, the peripheral surface of the punch cooperates with the side push blocks to process a shrinkage of the workpiece;

[0007] A lower die, the lower die comprising a lower die assembly, a concave cavity provided on the lower die assembly and cooperating with the male die assembly, and a plurality of driving mechanisms connected to the lower die assembly;

[0008] After the molds are closed, the central punch moves toward the direction close to the upper mold assembly, thereby driving all the first split punches to move toward the direction away from the central punch, so that the first split punches drive the second split punches to also move toward the direction away from the central punch, and the driving mechanism can drive the side push blocks to move toward the direction close to the central punch until they fit the workpiece;

[0009] After the mold is opened, the center punch moves away from the upper mold assembly, thereby driving all of the first petal punches to move toward the center punch. The driving assembly contacts the second petal punches one by one to drive the second petal punches back to their positions.

[0010] Furthermore, the center punch is connected to the upper mold assembly via a spring, and the center punch is also sleeved on a guide rod having one end connected to the upper mold assembly.

[0011] Furthermore, there are four inclined first inclined surfaces on the upward-view orthographic projection surface of the center punch, and a dovetail groove that penetrates outward and is inclined is provided between every two adjacent first inclined surfaces. A first bevel surface distributed on the center punch is provided on both sides of each dovetail groove, and the inclination of the dovetail groove is consistent with the inclination of the first bevel surface.

[0012] Furthermore, each of the first-petal punches is slidably connected to the dovetail groove in a one-to-one correspondence, and the first-petal punch has a protrusion corresponding to the position of the dovetail groove that slidably cooperates with the dovetail groove. The two sides of the protrusion are respectively provided with a second bevel surface that cooperates with the first bevel surface. The second bevel surface cooperates with the first bevel surface to drive the first petal punch to reciprocate in the direction close to or away from the center punch.

[0013] Furthermore, a third bevel surface capable of abutting against the second bevel punch is provided on each side of the first split-flap punch, and a fourth bevel surface is provided at the corresponding position of the second split-flap punch, and the fourth bevel surface cooperates with the third bevel surface to drive the second split-flap punch to move in a direction away from the center punch; a second inclined surface opposite to the first inclined surface is adjacent to the two fourth bevel surfaces of the second split-flap punch, and the second inclined surface cooperates with the first inclined surface.

[0014] Furthermore, the driving assembly includes a mounting cavity provided on the upper mold assembly, an ejector pin connected to the mounting cavity via an ejector spring, an inclined guide column capable of penetrating the second petal punch and having one end connected to the upper mold assembly, and a limiting washer connected to the inclined guide column for preventing the second petal punch from falling out; the ejector end of the ejector pin can extend out of the mounting cavity and abut against the second petal punch; when the mold is opened, the compressed ejector spring returns to its position so as to drive the ejector pin to eject the mounting cavity and abut against the second petal punch, so that the second petal punch moves toward the direction close to the center punch.

[0015] Furthermore, the lower end of the upper mold assembly is provided with a plurality of upper mold leaning blocks which are distributed one by one on one side of the side push block, and each of the upper mold leaning blocks is provided with at least two laterally arranged connecting rods, one end of the connecting rod can pass through the upper mold leaning block and then be connected to the side push block, and the connecting rod is sleeved with a return spring distributed on the outside of the upper mold leaning block; the side push block is provided with a plurality of guide grooves at the position corresponding to the upper mold assembly, and the corresponding position of the upper mold assembly is provided with a guide rail which cooperates with the guide groove.

[0016] Furthermore, the driving mechanism is a lower die insert connected to the lower die assembly. When the mold is closed, the lower die insert is inserted between the upper die support block and the side push block to be used to abut against the side push block, so that the side push block can move toward the direction close to the center punch and fit with the workpiece. When the mold is opened, the return spring drives the side push block to return.

[0017] Furthermore, each of the side push blocks is provided with a recessed portion which is recessed in a direction close to the upper mold assembly, and all of the recessed portions are abutted against each other end to form a recessed position, and the lower mold assembly is provided with a protruding position which protrudes in a direction away from the lower mold assembly at a position corresponding to the recessed position, and the protruding position cooperates with the recessed position to fix the workpiece.

[0018] Furthermore, each side thrust block side wall is provided with a shrinkage molding recess adjacent to the recessed portion, and all the first-flap punches and all the second-flap punches have a shrinkage molding convex portion matching the shrinkage molding recess at the position corresponding to the shrinkage molding recess.

[0019] In summary, the beneficial effects of the utility model are as follows: 1. The first petal punch and the second petal punch expand radially to fit the workpiece to be punched. After the first petal punch and the second petal punch cooperate with the side push block, a necking portion can be processed for the speaker mesh workpiece. After the mold is opened, the first petal punch and the second petal punch retract radially, and the return spring drives the side push block away from the middle punch assembly. A gap appears between the punch assembly and the molded workpiece, and the punch assembly will not be tightly fastened to the punch assembly. The workpiece is easy to demold, and the molded product is easy to take out. 2. The radial expansion of the first petal punch and the second petal punch depends on the mutual cooperation of the various bevel surfaces. The return of the first petal punch and the second petal punch is also through mechanical components, which are reliable to drive and have high stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a structural schematic diagram of a necking die.

[0021] Figure 2 yes Figure 1 Vertical cross-sectional view of .

[0022] Figure 3 yes Figure 1 Another vertical cross-sectional view of .

[0023] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle and upper mold.

[0024] Figure 5 yes Figure 4 Schematic diagram of the structure with workpieces assembled.

[0025] Figure 6 It is a structural schematic diagram of the punch assembly in the utility model.

[0026] Figure 7 It is a bottom view of the center punch in the utility model.

[0027] Figure 8 It is a three-dimensional structural schematic diagram of the central punch in the utility model.

[0028] Fig. 9 It is a structural schematic diagram of the first distinguishing convex mold and the second petal dividing convex mold in the utility model in a connected state.

[0029] Fig.10 A schematic diagram of the three-dimensional structure of the side push block in the utility model.

[0030] Fig.11 It is a structural schematic diagram of the lower mold in the utility model.

[0031] Fig.12 yes Fig.11 Schematic diagram of the structure in which a workpiece is placed in the concave cavity.

[0032] In the figure, 100-upper die, 110-upper die assembly, 111-upper die seat, 112-upper clamp, 112A-upper die block, 112B-connecting rod, 112C-return spring, 112D-guide rail, 120-punch assembly, 121-center punch, 1210-spring, 1211-guide rod, 121A-first inclined surface, 121B-dovetail slide, 121C-first bevel surface, 122-first A split-petal punch, 1220-a raised portion, 1221-a second beveled surface, 1222-a third beveled surface, 123-a second split-petal punch, 1230-a second inclined surface, 124-a driving assembly, 124A-an ejector spring, 124B-an ejector pin, 124C-an inclined guide column, 124D-a limiting washer, 130-a side push block, 131-a recessed portion, 125-a shrinkage molding convex portion, 1310-a shrinkage molding concave portion;

[0033] 200-lower die, 210-lower die assembly, 211-lower stripping plate, 212-lower clamping plate, 213-lower die base, 214-lower pad, 215-lower supporting plate, 220-concave cavity, 221-protruding position, 230-driving mechanism; 300-speaker net, 310-side support ear. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with specific drawings.

[0035] See also Figure 1 The utility model provides a necking mold, including: an upper mold 100 and a lower mold 200 that cooperates with the upper mold 100.

[0036] See also Figure 2 and Figure 4 The upper mold 100 includes an upper mold assembly 110, a male mold assembly 120 connected to the middle of the lower end of the upper mold assembly 110, and a plurality of side push blocks 130 distributed around the male mold assembly 120. The upper mold assembly 110 includes an upper mold base 111 and an upper clamping plate 112 arranged in sequence from top to bottom, and the male mold assembly 120 is connected below the upper clamping plate 112. Figure 6 The punch assembly 120 includes a center punch 121 elastically connected to the upper mold assembly 110, a plurality of first petal punches 122 connected to the center punch 121 and arranged at intervals around the center punch 121, a plurality of second petal punches 123 arranged alternately with the first petal punches 122 and distributed around the center punch 121, and a plurality of driving assemblies 124. The plurality of first petal punches 122 and the plurality of second petal punches 123 cooperate with each other to form a punch outer peripheral surface having a shape that matches the shape of the workpiece, and the punch outer peripheral surface cooperates with the side push block 130 to process the workpiece shrinkage.

[0037] See also Fig.11 and Fig.12 , the lower mold 200 includes a lower mold assembly 210, a concave cavity 220 arranged on the lower mold assembly 210 and cooperating with the male mold assembly 120, and a plurality of driving mechanisms 230 connected to the lower mold assembly 210. The lower mold assembly 210 includes a lower stripping plate 211, a lower clamping plate 212, a lower mold base 213, a lower pad 214 and a lower supporting plate 215 which are arranged in sequence from top to bottom, and the concave cavity 220 is arranged on the lower supporting plate 215.

[0038] After the mold is closed, the center punch 121 moves toward the direction close to the upper mold assembly 110, thereby driving all the first petal punches 122 to move toward the direction away from the center punch 121, so that the first petal punch 122 drives the second petal punch 123 to move away from the center punch 121, and the driving mechanism 230 can drive the side push block 130 to move toward the direction close to the center punch 121 until it fits with the workpiece. During the mold closing process, the center punch 121 moves upward, driving the first petal punch 122 to move away from the center punch 121, and the second petal punch 123 is also driven to move away from the center punch 121, so that the petal punches around the center punch 121 expand and fit circumferentially with the inner surface of the workpiece. Please refer to Figure 5 The side push block 130 fits with the outer surface of the workpiece on the outside, so that the shrinkage processing can be performed, and the side push block 130 also prevents the side ears 310 of the speaker mesh 300 from being deformed during the processing.

[0039] After the mold is opened, the central punch 121 moves away from the upper mold assembly 110, thereby driving all the first petal punches 122 to move toward the central punch 121, and the driving assembly 124 contacts the second petal punches 123 one by one to drive the second petal punches 123 to return. During the mold opening process, the upper mold 100 and the lower mold 200 move away from each other, and after the elastically connected central punch 121 returns, it drives the first petal punches 122 to return, and the driving assembly 124 drives the second petal punches 123 to return. After the return, the punch assembly 120 shrinks and no longer tightly adheres to the inside of the workpiece, making it easy to take out the formed workpiece, i.e., the speaker mesh 300.

[0040] See also Figure 2 The center punch 121 is connected to the upper mold assembly 110 through a spring 1210, and the center punch 121 is also sleeved with a guide rod 1211 having one end connected to the upper mold assembly 110. The center punch 121 is provided with a guide cavity corresponding to the position of the guide rod 1211, and can move back and forth smoothly under the guidance of the guide rod 1211.

[0041] See also Figure 7 and Figure 8The center punch 121 has four inclined first inclined surfaces 121A on its upward projection plane, and a dovetail chute 121B extending outward and arranged at an angle is provided between each two adjacent first inclined surfaces 121A. Each dovetail chute 121B has a first beveled surface 121C distributed on the center punch 121 on both sides, and the inclination of the dovetail chute 121B is consistent with the inclination of the first beveled surface 121C. Each of the first split-petal punches 122 is slidably connected to the dovetail chute 121B in a one-to-one correspondence, see Fig. 9 The first petal punch 122 has a protrusion 1220 corresponding to the position of the dovetail slot 121B, which is slidably matched with the dovetail slot 121B. The two sides of the protrusion 1220 are respectively provided with a second beveled surface 1221 that cooperates with the first beveled surface 121C. The second beveled surface 1221 cooperates with the first beveled surface 121C to drive the first petal punch 122 to reciprocate in the direction of approaching or moving away from the center punch 121. The dovetail slot 121B can be used to prevent the first petal punch 122 from falling out, and then the first petal punch 122 is driven to expand through the inclination of the dovetail slot 121B and the cooperation of each beveled surface.

[0042] See also Fig. 9 , a third beveled surface 1222 capable of abutting against the second split-petal punch 123 is provided on both sides of the first split-petal punch 122, and a fourth beveled surface is provided at the corresponding position of the second split-petal punch 123, and the fourth beveled surface cooperates with the third beveled surface 1222 to drive the second split-petal punch 123 to move in a direction away from the central punch 121. Driving the second split-petal punch 123 to expand is also accomplished by the mutually cooperating beveled surfaces, without the need for electric components, with an ingenious design and high reliability.

[0043] A second inclined surface 1230 opposite to the first inclined surface 121A is adjacent to the two fourth bevel surfaces of the second split punch 123, and the second inclined surface 1230 cooperates with the first inclined surface 121A. When the punch assembly 120 is in a retracted state, there is an inclined gap between the first inclined surface 121A and the second inclined surface 1230 to prevent interference with the movement of the center punch 121.

[0044] The return of the second splitting punch 123 is achieved by the driving assembly 124, see Figure 3The driving assembly 124 includes a mounting cavity provided on the upper mold assembly 110, an ejector pin 124B connected to the mounting cavity via an ejector spring 124A, an inclined guide column 124C capable of penetrating the second petal punch 123 and having one end connected to the upper mold assembly 110, and a limiting washer 124D connected to the inclined guide column 124C for preventing the second petal punch 123 from falling out. The ejection end of the ejector pin 124B can extend out of the installation cavity and abut against the second petal punch 123. When the mold is closed, the ejector spring 124A will be squeezed and retracted into the installation cavity. After the mold is opened, the compressed ejector spring 124A returns to its original position, and the ejector pin 124B is driven downward to be ejected from the installation cavity and abut against the second petal punch 123, applying force to the second petal punch 123, so that the second petal punch 123 moves toward the direction close to the center punch 121, and the expanded second petal punch 123 moves toward the direction close to the center punch 121. After the radially expanded first petal punch 122 and second petal punch 123 return to their original positions, a gap will be formed between the punch assembly 120 and the workpiece to prevent the workpiece from being tightly fastened to the punch assembly 120, making it easier to demold the workpiece and reducing the wear on the workpiece caused by demolding.

[0045] Each of the side push blocks 130 is provided with a recessed portion 131 that is recessed toward the direction close to the upper mold 100 assembly, and all the recessed portions 131 are abutted against each other end to form a recessed position. The lower mold 200 assembly is provided with a protruding position 221 that protrudes toward the direction away from the lower mold 200 assembly at the position corresponding to the recessed position, and the protruding position 221 cooperates with the recessed position to fix the workpiece. When processing the speaker mesh 300 workpiece, the speaker mesh 300 to be processed is placed in the cavity 220, and when the upper mold 100 is pressed downward, the protruding position 221 and the recessed position cooperate with each other to fix the workpiece vertically. After the side push block 130 is driven by the driving mechanism 230 to fit the workpiece to the outer wall of the workpiece, it can cooperate with the punch assembly 120 to clamp the workpiece and fix the workpiece in the horizontal direction.

[0046] When the upper die 100 and the lower die 200 cooperate to punch a workpiece, please refer to Fig.10 Each side push block 130 has a side wall with a shrinkage molding recess 1310 adjacent to the recess 131, and all the first petal convex molds 122 and all the second petal convex molds 123 have a shrinkage molding convex part 125 matching the shrinkage molding recess 1310 at the position corresponding to the shrinkage molding recess 1310. The cover of the speaker mesh 300 is stamped to form a shrinkage part, and the shrinkage part is formed with a full-circle undercut.

[0047] When the mold is closed for stamping, the lower end of the upper mold assembly 110 is provided with a plurality of upper mold blocks 112A correspondingly distributed on one side of the side push block 130, and each of the upper mold blocks 112A is provided with at least two transversely arranged connecting rods 112B, one end of the connecting rod 112B can pass through the upper mold block 112A and then connect to the side push block 130, and the connecting rod 112B is sleeved with a return spring 112C distributed on the outer side of the upper mold block 112A. The driving mechanism 230 is a lower mold plunger connected to the lower mold assembly 210. After the mold is closed, the lower mold plunger is inserted between the upper mold block 112A and the side push block 130 to abut against the side push block 130, so that the side push block 130 can move toward the direction close to the central punch 121 and fit with the workpiece. After the mold is opened, the return spring 112C drives the side push block 130 to return. After the driving mechanism 230 is inserted between the upper mold block 112A and the side push block 130, it will drive the side push block 130 to move along the connecting rod 112B toward the punch assembly 120 until the shrinkage forming concave portion 1310 and the shrinkage forming convex portion 125 on the punch assembly 120 process the shrinkage portion of the speaker mesh 300 workpiece, and the side wall of the side push block 130 is adapted to the outer peripheral surface of the punch assembly 120, and the side support ear 310 of the workpiece is clamped to prevent deformation during the stamping process that affects the quality of the finished product.

[0048] The side push block 130 is provided with a plurality of guide slots at the position corresponding to the upper mold assembly 110, and a guide rail 112D cooperating with the guide slots is provided at the corresponding position of the upper mold assembly 110. The sliding cooperation between the guide rail 112D and the guide slots enables the side push block 130 to reciprocate smoothly.

[0049] The working process of the necking mold is as follows: the speaker mesh 300 to be punched is placed in the concave cavity 220, and the upper mold 100 moves downward for punching. When the mold is closed, the center punch 121 moves upward, thereby driving the first petal punch 122 connected to the dovetail groove 121B to move in the direction away from the center punch 121. Through the mutual cooperation of the beveled surfaces on the first petal punch 122 and the second petal punch 123, several second petal punches 123 also move in the direction away from the center punch 121. Therefore, the first petal punch 122 and the second petal punch 123 can radially expand and fit on the inner surface of the workpiece, and the side push block 130 fitted with the outer surface of the workpiece cooperates with each other to process the necking part. When the mold is opened, the radially expanded first petal punch 122 and the second petal punch 123 can retract to form a gap with the workpiece, so that the speaker mesh 300 workpiece with full-circle undercut can be smoothly demolded, making it easy to take out the molded product.

[0050] This necking mold: 1. The first petal punch 122 and the second petal punch 123 expand radially to fit the workpiece to be punched. After the first petal punch 122 and the second petal punch 123 cooperate with the side push block 130, they can process the necking part for the speaker mesh 300 workpiece. After the mold is opened, the first petal punch 122 and the second petal punch 123 retract radially, and the return spring 112C drives the side push block 130 away from the middle punch assembly 120. A gap appears between the punch assembly 120 and the molded workpiece, and it will not be tightly fastened to the punch assembly 120. The workpiece is easy to demold and the molded product is easy to take out. 2. The radial expansion of the first petal punch 122 and the second petal punch 123 depends on the mutual cooperation of the various bevel surfaces. The return of the first petal punch 122 and the second petal punch 123 is also through mechanical components, which are reliable to drive and have high stability.

[0051] The above are only implementation methods of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure made using the contents of the specification and drawings of the present utility model, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present utility model.

Claims

1. A necking die, characterized in that: include: An upper die, the upper die comprising an upper die assembly, a punch assembly connected to the middle of the lower end of the upper die assembly, and a plurality of side push blocks distributed around the punch assembly; the punch assembly comprises a central punch elastically connected to the upper die assembly, a plurality of first petal punches connected to the central punch and arranged at intervals around the central punch, a plurality of second petal punches arranged in an interlaced manner with the first petal punches and distributed around the central punch, and a plurality of drive assemblies, the plurality of first petal punches and the plurality of second petal punches cooperate with each other to form a peripheral surface of the punch having a shape that matches the shape of the workpiece, the peripheral surface of the punch cooperates with the side push blocks to process a shrinkage of the workpiece; A lower die, the lower die comprising a lower die assembly, a concave cavity provided on the lower die assembly and cooperating with the male die assembly, and a plurality of driving mechanisms connected to the lower die assembly; After the molds are closed, the central punch moves toward the direction close to the upper mold assembly, thereby driving all the first split punches to move toward the direction away from the central punch, so that the first split punches drive the second split punches to also move toward the direction away from the central punch, and the driving mechanism can drive the side push blocks to move toward the direction close to the central punch until they fit the workpiece; After the mold is opened, the center punch moves away from the upper mold assembly, thereby driving all of the first petal punches to move toward the center punch. The driving assembly contacts the second petal punches one by one to drive the second petal punches back to their positions.

2. The necking mold according to claim 1, characterized in that: The central punch is connected to the upper die assembly via a spring, and the central punch is also sleeved with a guide rod having one end connected to the upper die assembly.

3. The necking mold according to claim 1, characterized in that: There are four inclined first inclined surfaces on the upward-looking orthographic projection surface of the center punch, and a dovetail groove that penetrates outward and is inclined is provided between every two adjacent first inclined surfaces. A first bevel surface distributed on the center punch is provided on both sides of each dovetail groove, and the inclination of the dovetail groove is consistent with the inclination of the first bevel surface.

4. The necking mold according to claim 3, characterized in that: Each of the first-petal punches is slidably connected to the dovetail slot in a one-to-one correspondence. The first-petal punch has a protrusion corresponding to the position of the dovetail slot that slidably cooperates with the dovetail slot. Both sides of the protrusion are respectively provided with a second bevel surface that cooperates with the first bevel surface. The second bevel surface cooperates with the first bevel surface to drive the first-petal punch to reciprocate in the direction close to or away from the center punch.

5. The necking mold according to claim 4, characterized in that: A third bevel surface that can abut against the second bevel punch is provided on each side of the first split-flap punch, and a fourth bevel surface is provided at the corresponding position of the second split-flap punch, and the fourth bevel surface cooperates with the third bevel surface to drive the second split-flap punch to move in a direction away from the center punch; a second inclined surface opposite to the first inclined surface is adjacent to the two fourth bevel surfaces of the second split-flap punch, and the second inclined surface cooperates with the first inclined surface.

6. The necking die according to any one of claims 1 to 5, characterized in that: The driving assembly includes a mounting cavity provided on the upper mold assembly, an ejector pin connected to the mounting cavity via an ejector spring, an inclined guide column capable of penetrating the second petal punch and having one end connected to the upper mold assembly, and a limiting washer connected to the inclined guide column for preventing the second petal punch from falling out. The ejector end of the ejector pin can extend out of the mounting cavity and abut against the second petal punch. After the mold is opened, the compressed ejector spring returns to its original position, thereby driving the ejector pin to eject the mounting cavity and abut against the second petal punch, so that the second petal punch moves toward the direction close to the center punch.

7. The necking die according to any one of claims 1 to 5, characterized in that: The lower end of the upper mold assembly is provided with a plurality of upper mold leaning blocks which are distributed one by one on one side of the side push block, each of the upper mold leaning blocks is provided with at least two laterally arranged connecting rods, one end of the connecting rod can pass through the upper mold leaning block and then be connected to the side push block, and a return spring distributed on the outer side of the upper mold leaning block is sleeved on the connecting rod; the side push block is provided with a plurality of guide grooves at the position corresponding to the upper mold assembly, and a guide rail cooperating with the guide groove is provided at the corresponding position of the upper mold assembly.

8. The necking mold according to claim 7, characterized in that: The driving mechanism is a lower die insert connected to the lower die assembly. When the die is closed, the lower die insert is inserted between the upper die support block and the side push block to abut against the side push block, so that the side push block can move toward the direction close to the center punch and fit with the workpiece. When the die is opened, the return spring drives the side push block to return.

9. The necking mold according to claim 1, characterized in that: Each of the side push blocks is provided with a recessed portion which is recessed in a direction close to the upper mold assembly, and all of the recessed portions are abutted against each other end to form a recessed position, and the lower mold assembly is provided with a protruding position which protrudes in a direction away from the lower mold assembly at a position corresponding to the recessed position, and the protruding position cooperates with the recessed position to fix the workpiece.

10. The necking mold according to claim 9, characterized in that: Each side thrust block side wall is provided with a shrinkage molding recess adjacent to the recessed portion, and all the first split-flap punches and all the second split-flap punches have a shrinkage molding convex portion matching the shrinkage molding recess at the position corresponding to the shrinkage molding recess.

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