A horn mesh necking die
By designing a horn mesh reduction mold and adopting a combination structure of mold core, segmented mold core and insert knife, high-precision forming of small horn mesh parts was achieved, solving the problem of insufficient precision of traditional molds, simplifying the mold structure and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING DONGJU METAL PROD CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional stamping dies cannot meet the forming precision requirements of small speaker grilles, especially the forming precision of the constricted end of the metal speaker grille.
A horn mesh reduction mold was designed, which adopts a combination structure of upper and lower molds. Through the staggered distribution of the mold core, the first segment mold core and the second segment mold core and the inclined wedge transmission, progressive forming is achieved. The precise forming of small horn mesh parts is completed by the cooperation of the elastic reset component and the insert knife.
It improves the processing accuracy of small speaker grilles, avoids workpiece misalignment and bracket deformation, realizes the forming of complex internal cavity structures, simplifies the mold structure, and reduces costs.
Smart Images
Figure CN224346792U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of stamping die technology, specifically relating to a horn mesh necking die. Background Technology
[0002] A speaker grille is a protective mesh structure installed at the front of a loudspeaker. It is also called a speaker grille or loudspeaker cover. It is an important component of audio equipment and electronic devices (such as computers, televisions, radios, headphones, etc.), primarily used to protect the speaker unit, prevent dust accumulation, optimize acoustic performance, and also serve an aesthetic purpose.
[0003] Metal speaker grilles typically require a stamping die to form a tapered end at one end, resulting in a full-circumference undercut. Smaller speaker grilles demand higher precision in their forming, but traditional tapering dies are mostly designed for larger grilles and cannot meet the precision requirements of smaller ones. Therefore, designing a dedicated die for tapering smaller speaker grilles is essential. Utility Model Content
[0004] In view of the technical problems existing in the prior art, this utility model provides a horn mesh narrowing mold.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A horn mesh reduction mold, comprising:
[0007] The upper mold includes an upper mold assembly, a punch core disposed on the upper mold assembly, and a plurality of inserts arranged at intervals around the punch core. The punch core includes a mold center core, a plurality of first segmented mold cores and a plurality of second segmented mold cores distributed interlaced around the mold center core, and an elastic reset assembly connected to the upper ends of the mold center core and the first segmented mold cores. In the open mold state, there is a height difference between the bottom surface of the mold center core and each first segmented mold core and the bottom surface of the second segmented mold cores, and the bottom surface of the mold center core and each first segmented mold core is closer to the lower mold in the vertical direction.
[0008] The lower mold includes a lower mold assembly, a central support column disposed on the upper end of the lower mold assembly for carrying the workpiece, a plurality of side push blocks arranged at intervals around the central support column and capable of reciprocating in the direction of approaching or moving away from the central support column, and a reset mechanism corresponding to and connected to the side push blocks.
[0009] In the mold-closed state, after the mold core and each first segment mold core enter the workpiece cavity, they can move away from the lower mold to drive the second segment mold cores to move away from the mold core, so that a plurality of second segment mold cores and a plurality of first segment mold cores cooperate with each other to form a forming surface for forming the workpiece; a plurality of inserts can drive the corresponding side push blocks to move towards the central support column, and the side push blocks that converge with each other can surround and form a mold cavity that encloses the workpiece. The side push blocks located outside the workpiece squeeze the workpiece and cooperate with the forming surface located inside the workpiece to process the narrowing of the workpiece.
[0010] Furthermore, the punch core also includes an insert embedded in the upper die assembly. The insert has a through cavity that extends vertically through the insert, and the inner wall of the through cavity has a plurality of first inclined grooves for assembling the first segmented die core and arranged at an inclination. Each first inclined groove has a limiting part that can prevent the first segmented die core from dislodging from the first inclined groove during the resetting process.
[0011] The first segmented mold core includes a first segmented body having an inclined inner wall, a first dovetail protrusion extending from the first segmented body away from the inclined inner wall and having a shape adapted to the first inclined groove, and a first processing side surface disposed below the first dovetail protrusion.
[0012] Furthermore, the second segmented mold core includes a second segmented body, a second dovetail protrusion protruding from the inner wall of the second segmented body and arranged at an inclination, an outer arc surface away from the second dovetail protrusion and whose shape is adapted to the through cavity, and a second processing side surface distributed below the outer arc surface and whose shape is consistent with the first processing side surface. A plurality of the first processing side surfaces and a plurality of the second processing side surfaces intersect each other and can be spliced together to form the molding processing surface.
[0013] Furthermore, the outer periphery of the mold core is provided with a number of dovetail oblique grooves that are spaced apart and can be slidably connected to a number of second dovetail protrusions. Between each two adjacent dovetail oblique grooves, there is an inclined surface that is adapted to the inclined inner sidewall.
[0014] When the mold core and each of the first segmented mold cores move away from the lower mold, the second segmented mold cores can be driven to move away from the mold core through the cooperation of the second dovetail protrusion and the dovetail oblique groove; after the mold is opened, the elastic reset component causes the mold core and each of the first segmented mold cores to reset to their initial positions along the mold opening direction, and drives the second segmented mold cores to move closer to the mold core through the cooperation of the second dovetail protrusion and the dovetail oblique groove.
[0015] Furthermore, the upper mold assembly includes an upper mold base, an upper clamping plate, a stop plate, and an upper release plate arranged sequentially from top to bottom. The upper mold base and the upper clamping plate are provided with embedded seats that are connected to the elastic reset assembly. The upper mold base and the stop plate are provided with inserts, and the insert is embedded in the upper release plate.
[0016] Furthermore, the elastic reset assembly includes a guide rod with one end passing through the insert and connected to the mold core, a positioning member connected to the guide rod to prevent the mold core from separating from the guide rod, a first spring disposed on the upper end of the guide rod and installed in the insert, a plurality of ejector pins corresponding to and abutting against the top surface of the first segmented mold core, and a plurality of second springs corresponding to and abutting against the upper ends of the ejector pins and installed in the insert. One end of the ejector pin passes through the insert and contacts the first segmented mold core. When the mold core and the first segmented mold core enter the inner cavity of the workpiece and abut against the workpiece, in the mold-closed state, the mold core can squeeze the first spring and the first segmented mold core can squeeze the second spring; in the mold-open state, the mold core resets under the action of the first spring, and the first segmented mold core resets under the action of the second spring.
[0017] Furthermore, one end of all the inserts is connected to the upper mold base. A plurality of third springs are provided between the upper ejector plate and the upper mold base. The upper ejector plate is provided with a through-hole. The end of the insert away from the upper mold base can enter / exit the through-hole. In the mold-open state, the third springs are in a free state, so that the end of the insert away from the upper mold base is located in the through-hole. In the mold-closed state, the upper ejector plate moves toward the upper mold base and compresses the third springs, so that the end of the insert away from the upper mold base can extend out from the through-hole.
[0018] Furthermore, the lower mold assembly includes a lower ejector plate, a lower mold base, several lower pads, and a lower support plate arranged sequentially from top to bottom. One end of the central support column is mounted on the lower mold base, while the other end, away from the lower mold base, passes through the lower ejector plate and protrudes outside the lower ejector plate. A cylinder is mounted on the lower support plate, and the cylinder is connected to the central support column through a top material component. The cylinder can drive the central support column to reciprocate within the lower ejector plate.
[0019] Furthermore, all of the side push blocks include a forming block connected to the lower release plate via a guide rail, a mounting position disposed on the forming block and distributed away from the central support column, and a side mating block mounted on the mounting position;
[0020] The molding end face of the molding block includes an arc surface that abuts against the central support column and is adapted in shape, and a molding surface that is higher than the central support column. The shape of the molding surface is adapted to the shape of the molding processing surface. Several molding surfaces can be assembled to form the mold cavity. Two of the molding surfaces are provided with anti-misfit grooves to prevent workpiece misassembly.
[0021] The side mating block is provided with a first inclined wedge surface, and the corresponding position of the inserter is provided with a second inclined wedge surface. When the mold is closed, the first inclined wedge surface and the second inclined wedge surface cooperate with each other to drive the molding block to move toward the direction closer to the central support column.
[0022] Furthermore, the reset mechanism includes a support block distributed on one side of the side mating block and connected to the lower release plate, a plurality of assembly cavities arranged at intervals on the support block, a plurality of connecting rods installed in the assembly cavities one by one, and a reset spring installed in the assembly cavities one by one and sleeved on the connecting rods. The end of the connecting rod away from the reset spring can be connected to the molding block.
[0023] In the mold-closed state, the inserter is inserted between the abutment block and the side mating block. Through the mutual cooperation of the first inclined wedge and the second inclined wedge, the molding block connected to the side mating block can move toward the direction closer to the central support column and compress the return spring.
[0024] In the open mold state, the insert retracts from between the abutment block and the side mating block, and the molding block is reset by the action of the return spring.
[0025] In summary, the beneficial effects of this utility model are as follows: 1. In the open mold state, the bottom surface of the mold core and the first segmented mold core is lower than that of the second segmented mold core. When the mold is closed, the mold core and the first segmented mold core are first inserted into the inner cavity of the workpiece to complete the pre-positioning. Then, the second segmented mold core is gradually expanded by the wedge drive to form a complete forming surface. This avoids the workpiece displacement caused by the "direct extrusion" of traditional molds. It is specially designed for processing small speaker grilles, and is dedicated to this purpose, meeting the processing accuracy requirements of small speaker grilles. 2. The first and second segmented mold cores are staggered and are combined to form a forming surface when the mold is closed. When the mold is opened, they shrink and demold simultaneously, which can form complex internal cavity structures. It is suitable for the support ears and full-circumference undercut forming of small speaker grilles, avoiding deformation of the support ears or incomplete undercuts. 3. The insert cutter, through the cooperation of the first and second wedge surfaces, converts the vertical movement of the upper mold into the horizontal driving force of the side push block, driving the forming block to converge towards the central support column to form a mold cavity surrounding the workpiece. No additional power source is required. The mechanical inclined plane amplifies and stably transmits the force, ensuring that the side push block and each segment mold core extrude the workpiece synchronously. Attached Figure Description
[0026] Figure 1This is a structural diagram of the small speaker grille that needs to be processed by this shrinking mold.
[0027] Figure 2 This is a schematic diagram of the structure of a horn mesh shrinking mold in the closed state, provided by this utility model, for processing shrinking.
[0028] Figure 3 yes Figure 2 Sectional view along the AA direction.
[0029] Figure 4 yes Figure 3 A magnified view of part A in the middle.
[0030] Figure 5 yes Figure 2 A schematic diagram of the three-dimensional structure of the upper and middle molds.
[0031] Figure 6 yes Figure 5 A three-dimensional structural diagram of the central punch core.
[0032] Figure 7 yes Figure 6 Front view of the central punch core in the open mold state.
[0033] Figure 8 yes Figure 7 Top view.
[0034] Figure 9 yes Figure 8 Sectional view along the BB direction.
[0035] Figure 10 yes Figure 8 Sectional view along the CC direction.
[0036] Figure 11 yes Figure 8 Top view of the central inlay.
[0037] Figure 12 This is a three-dimensional structural diagram of the first segmented mold core in this utility model.
[0038] Figure 13 This is a three-dimensional structural diagram of the second segmented mold core in this utility model.
[0039] Figure 14 This is a three-dimensional structural diagram of the core of the mold in this utility model.
[0040] Figure 15 This is a schematic diagram of the elastic reset component in this utility model.
[0041] Figure 16 This is a three-dimensional structural diagram of the lower mold in the closed state in this utility model.
[0042] Figure 17 yes Figure 16 A schematic diagram of the structure in which the workpiece has not been removed.
[0043] Figure 18 yes Figure 17 A magnified view of a section at point B.
[0044] Figure 19 This is a three-dimensional structural diagram of the side push block in this utility model.
[0045] In the diagram, 100 is the speaker grille, 110 is the side wall, 111 is the large lug, and 112 is the small lug.
[0046] 200-Upper mold assembly, 210-Upper mold base, 211-Insert, 220-Upper clamping plate, 221-Embedded seat, 230-Stop plate, 240-Upper release plate, 250-Guide post;
[0047] 300-Punch core, 310-Mold core, 311-Dovetail groove, 312-Inclined surface, 313-Guide cavity, 314-Positioning cavity, 320-First segmented mold core, 321-First segmented body, 322-First dovetail protrusion, 3220-Limiting block, 323-First machined side surface, 323A-First outer side surface, 323B-Inclined outer side surface, 323C-Transition curved surface, 330-Second segmented mold core, 331-Second segmented body, 332-Second dovetail protrusion, 333-Outer arc surface, 334-Second machined side surface, 335-Pin, 340-Elastic reset assembly, 341-Guide rod, 342-First spring, 343-Ejector pin, 344-Second spring, 350-Insert, 351-Through cavity, 352-First groove, 3520-Limiting part;
[0048] 400 - Insertion tool, 410 - Second bevel face;
[0049] 500-Lower mold assembly, 510-Lower ejector plate, 511-Anti-reverse limiting component, 512-Guide base block, 5120-Cavity, 513-Side block, 520-Lower mold base, 530-Lower pad, 540-Lower support plate
[0050] 600 - Center-supported column;
[0051] 700-Side push block, 710-Forming block, 711-Arc surface, 7110-Guide rail, 712-Forming surface, 7120-Anti-foolproof groove, 720-Mounting position, 730-Side mating block, 721-Second inclined wedge surface;
[0052] 800-Reset mechanism, 810-Allow block, 820-Connecting rod, 830-Reset spring, 900-Cylinder, 910-Top material component. Detailed Implementation
[0053] The present invention will be further illustrated below with reference to specific figures.
[0054] Please see Figure 1 A small speaker mesh to be processed, the speaker mesh 100 (hereinafter also referred to as the workpiece) has a side wall 110, and a large ear 111 and several small ears 112 are fixed on the side wall 110, the large ear 111 and several small ears 112 are arranged at intervals.
[0055] Please see Figure 2 and Figure 3 This utility model provides a horn mesh reduction mold, including an upper mold and a lower mold. The upper mold includes an upper mold assembly 200, a punch core 300 disposed on the upper mold assembly 200, and a plurality of inserts 400 arranged at intervals around the punch core 300. The punch core 300 includes a mold center core 310, a plurality of first segmented mold cores 320 and a plurality of second segmented mold cores 330 arranged alternately around the mold center core 310, and an elastic reset assembly 340 connected to the upper ends of the mold center core 310 and the first segmented mold cores 320. (See also...) Figure 7 , Figure 8 , Figure 9 and Figure 10 In the open mold state, there is a height difference between the bottom surface of the mold core 310 and each of the first segmented mold cores 320 and the bottom surface of the second segmented mold cores 330, and the bottom surface of the mold core 310 and each of the first segmented mold cores 320 is closer to the lower mold in the vertical direction. The lower mold includes a lower mold assembly 500, a central support column 600 disposed at the upper end of the lower mold assembly 500 for supporting the workpiece, a plurality of side push blocks 700 arranged at intervals around the central support column 600 and capable of reciprocating in the direction of approaching or moving away from the central support column 600, and a reset mechanism 800 corresponding to and connected to the side push blocks 700. In the closed mold state, after the mold core 310 and each of the first segmented mold cores 320 enter the inner cavity of the workpiece, they can move in the direction away from the lower mold to drive the second segmented mold cores 330 to move in the direction away from the mold core 310, so that the plurality of second segmented mold cores 330 and the plurality of first segmented mold cores 320 cooperate with each other to form a forming surface for forming the workpiece. Several inserters 400 can drive the corresponding side pushers 700 to move toward the central support column 600. The side pushers 700 that come together can surround and form a mold cavity that encloses the workpiece. The side pushers 700 located outside the workpiece can press the side wall 110 of the workpiece and cooperate with the forming surface located inside the workpiece to process the narrowing of the workpiece.
[0056] Using the above mold, in the open state, several side push blocks 700 are distributed away from the central support column 600, placing the small speaker mesh 100 to be processed on the central support column 600, with the inner cavity port of the workpiece facing the upper mold. The upper mold descends to close, and the mold core 310 closest to the lower mold and each first segment mold core 320 will enter the inner cavity of the workpiece first. The first segment mold cores 320 in contact with the workpiece will expand radially outward, driving several second segment mold cores 330 distributed between two adjacent first segment mold cores 320 to expand outward in all directions. After the interleaved second segment mold cores 330 and first segment mold cores 320 expand, please refer to... Figure 4 The outer peripheral surface forms a forming processing surface located in the inner cavity of the workpiece. During the mold closing process, the insert 400 on the upper mold can drive the side push block 700 to move horizontally towards the central support column 600 until the side push block 700 contacts the workpiece and pushes the side wall 110 of the workpiece inward. Then, it cooperates with the forming processing surface in the inner cavity of the workpiece to process the product's necking through the "inner support and outer pressure" forming mode. The height difference design between the mold core 310 and the first segmented mold core 320 (in the mold opening state) allows the mold to be positioned by the mold core 310 and the first segmented mold core 320 when it initially contacts the workpiece, and then drive the second segmented mold core 330 to expand, forming an orderly processing flow of "positioning first and then forming". This specialization further improves the accuracy.
[0057] Please see Figure 5 The upper mold assembly 200 includes, from top to bottom, an upper mold base 210, an upper clamping plate 220, a stop plate 230, and an upper release plate 240. Embedded seats 221 connected to the elastic reset assembly are embedded in the upper mold base 210 and the upper clamping plate 220. Inserts 211 are embedded in the upper mold base 210 and the stop plate 230. The upper mold assembly 200 adopts a layered structure, achieving functional partitioning through standardized plate stacking. The layered structure allows each functional module to be processed and assembled independently, facilitating quick disassembly and replacement of damaged parts during later maintenance.
[0058] Please see Figure 6 and Figure 11 The punch core 300 also includes an insert 350 embedded in the upper release plate 240. The insert 350 has a through cavity 351 that vertically penetrates it. The inner wall of the through cavity 351 has several first inclined grooves 352 for assembling the first segmented die core 320 and are arranged at an angle. Each first inclined groove 352 has a limiting part 3520 that prevents the first segmented die core 320 from dislodging from the groove during resetting. (See also...) Figure 12The first segmented mold core 320 includes a first segmented body 321 with an inclined inner wall, a first dovetail protrusion 322 that protrudes from the first segmented body 321 away from the inclined inner wall and whose shape is adapted to the first inclined groove 352, and a first processing side 323 provided below the first dovetail protrusion 322. The first dovetail protrusion 322 is provided with a limiting block 3220 that cooperates with the limiting part 3520. After the first segmented mold core 320 enters the inner cavity of the workpiece, the workpiece generates a reaction force on the first segmented mold core 320, pushing the first segmented mold core 320 to slide along the first inclined groove 352 away from the mold core 310 (i.e., radial expansion), thereby opening the inner cavity of the workpiece. When the first segmented mold core 320 expands radially, it will apply a horizontal thrust to the second segmented mold core 330, driving the second segmented mold core 330 to expand synchronously in all directions, so that the outer peripheral surfaces of all segmented mold cores are spliced into a complete molding surface. In the mold-open state, the first segmented mold core 320 and the second segmented mold core 330 return to their initial state and both will radially retract, so they can be smoothly disengaged from the full circumferential undercut formed by the side wall 110 of the workpiece.
[0059] Please see Figure 13 The second segmented mold core 330 includes a second segmented body 331, a second dovetail protrusion 332 protruding from the inner wall of the second segmented body 331 and inclined, an outer arc surface 333 away from the second dovetail protrusion 332 and whose shape matches the through cavity 351, and a second processing side surface 334 distributed below the outer arc surface 333 and whose shape is consistent with the first processing side surface 323. Several first processing side surfaces 323 and several second processing side surfaces 334 intersect each other and can be assembled to form a molding processing surface. The first processing side surface 323 includes a first outer side surface 323A distributed at the lower end of the first dovetail protrusion 322, an inclined outer side surface 323B adjacent to the first outer side surface 323A, and a transition curved surface 323C connecting the bottom surface of the first segmented body 321 and the inclined outer side surface 323B. The width of the inclined outer side surface 323B gradually increases from the connection with the first outer side surface 323A to the connection with the transition curved surface 323C. When the upper mold moves downward, it generates a horizontal force through the inclined surface contact, driving the second segmented mold core 330 to expand (spread) outwards, and cooperates with the first segmented mold core 320 to form a complete molding surface.
[0060] Please see Figure 14The outer periphery of the mold core 310 is provided with several dovetail grooves 311 spaced apart and capable of slidingly connecting with several second dovetail protrusions 332. Between each pair of adjacent dovetail grooves 311 is an inclined surface 312 adapted to the inclined inner sidewall. When the mold core 310 and each of the first segmented mold cores 320 move away from the lower mold, the engagement of the second dovetail protrusions 332 and the dovetail grooves 311 drives the second segmented mold cores 330 to move away from the mold core 310. After mold opening, the elastic reset assembly 340 causes the mold core 310 and each of the first segmented mold cores 320 to reset to their initial positions along the mold opening direction, and the engagement of the second dovetail protrusions 332 and the dovetail grooves 311 drives the second segmented mold cores 330 to move closer to the mold core 310. When the mold core 310 and the first segmented mold core 320 move downwards (towards the lower mold direction), the second dovetail protrusion 332 of the second segmented mold core 330 slides along the dovetail oblique groove 311 on the outer periphery of the mold core 310. Since the dovetail oblique groove 311 is at an inclined angle (with an angle to the mold opening direction), the vertical movement of the mold core 310 will be converted into a radial opening force of the second segmented mold core 330 (away from the mold core 310) through the inclined surface 312 of the dovetail oblique groove 311. The oblique wedge structure can convert the vertical force of the mold core 310 into the radial force of the segmented mold core, achieving a large opening force with a small driving force. Several second segmented mold cores 330 and the machined sides of the first segmented mold core 320 (such as the first machined side 323 and the second machined side 334) are assembled to form a complete forming surface for extruding or forming complex internal cavities of workpieces. When the mold is opened, the elastic reset component 340 drives the mold core 310 and the first segmented mold core 320 to reset. At this time, the second dovetail protrusion 332 of the second segmented mold core 330 slides in the opposite direction along the dovetail oblique groove 311. The inclined surface 312 of the dovetail oblique groove 311 converts the vertical reset motion of the mold core 310 into the radial contraction force of the second segmented mold core 330 (in the direction close to the mold core 310). After each segmented mold core contracts, it avoids interference with the inner cavity of the workpiece, which facilitates the demolding of the workpiece. At the same time, each component resets to the initial position to prepare for the next stamping.
[0061] Please see Figure 15The elastic reset assembly 340 includes a guide rod 341 with one end passing through the insert 211 and connected to the mold core 310, a positioning member connected to the guide rod 341 to prevent the mold core 310 from separating from the guide rod 341, a first spring 342 disposed on the upper end of the guide rod 341 and installed in the insert 221, a plurality of ejector pins 343 corresponding to and abutting against the top surface of the first segmented mold core 320, and a plurality of second springs 344 corresponding to and abutting against the upper end of the ejector pins 343 and installed in the insert 221. Each second segmented mold core 330 is connected to the insert 221 by a pin 335. The top of the mold core 310 has a guide cavity 313 for mounting the guide rod 341, while the bottom has a positioning cavity 314 for mounting the positioning element. The guide cavity 313 and the positioning cavity 314 are connected. The positioning element is preferably a bolt, which extends from the positioning cavity 314 and is screwed to the guide rod 341 to prevent the mold core 310 from separating from the guide rod 341. One end of the ejector pin 343 passes through the insert 211 and contacts the first segmented mold core 320. When the mold core 310 and the first segmented mold core 320 enter the inner cavity of the workpiece and abut against the workpiece, in the mold-closed state, the mold core 310 can compress the first spring 342, and the first segmented mold core 320 can compress the second spring 344. In the mold-open state, the mold core 310 returns to its original position under the action of the first spring 342, and the first segmented mold core 320 returns to its original position under the action of the second spring 344. This enables the mold to automatically reset after mold opening, ensuring that each segment mold core and the mold center core 310 can accurately return to their initial position after molding, preparing for the next cycle of mold closing.
[0062] One end of each inserter 400 is connected to the upper mold base 210. Several third springs are provided between the upper ejector plate 240 and the upper mold base 210. The upper ejector plate 240 has a through-hole, allowing the end of the inserter 400 away from the upper mold base 210 to enter / exit the through-hole. In the open mold state, the third springs are in a free state, allowing the end of the inserter 400 away from the upper mold base 210 to be located within the through-hole. In the closed mold state, the upper ejector plate 240 moves towards the upper mold base 210 and compresses the third springs, allowing the end of the inserter 400 away from the upper mold base 210 to extend out from the through-hole. In the open mold state, when the third spring is in a free state, there is a gap between the upper clamping plate 220 and the stop plate 230. Therefore, the end of the insert 400 away from the upper mold base 210 can be accommodated in the through-hole. After the mold is closed, the third spring is compressed, the upper clamping plate 220 and the stop plate 230 come into close contact, and this end of the insert 400 away from the upper mold base 210 extends out of the through-hole to work. In the open mold state, the insert 400 is hidden for protection to avoid interference. In the closed mold state, the insert 400 extends to work, precisely performing its function and achieving action timing control. The extension of the insert 400 depends on the displacement of the upper ejector plate 240 during mold closing, forming a timing coordination with the actions of each segmented mold core and the mold core 310. For example, after the segmented mold cores are assembled into the molding processing surface, the insert 400 extends again for precise driving, ensuring that each process is executed in sequence, improving processing accuracy and product quality.
[0063] Please see Figure 16 The lower mold assembly 500 includes, from top to bottom, a lower ejector plate 510, a lower mold base 520, several lower support feet 530, and a lower support plate 540. One end of the central support column 600 is mounted on the lower mold base 520, while the other end, away from the lower mold base 520, passes through the lower ejector plate 510 and protrudes outside the lower ejector plate 510. All side push blocks 700 include a forming block 710 connected to the lower ejector plate 510 via a guide rail 7110, mounting positions 720 distributed on the forming block 710 away from the central support column 600, and side mating blocks 730 mounted on the mounting positions 720. The forming end face of the forming block 710 includes an arc surface 711 that abuts against the central support column 600 and is shaped to match, and a forming surface 712 that is higher than the central support column 600. The guide rail 7110 is set on the arc surface 711, and the shape of the forming surface 712 matches the shape of the forming processing surface. The side mating block 730 is provided with a first inclined wedge surface, and the insert 400 is provided with a second inclined wedge surface 410 at a corresponding position. During the mold closing process, the second inclined wedge surface 410 of the insert 400 contacts the first inclined wedge surface of the side mating block 730. The vertical movement of the upper mold is converted into a horizontal lateral driving force of the forming block 710 by utilizing the mechanical principle of the inclined surface, driving the forming block 710 to move towards the central support column 600. No additional power source (such as cylinder or hydraulic cylinder) is required; the side pushing operation can be completed only by the mechanical movement of the mold opening and closing, simplifying the mold structure and reducing costs.
[0064] Please see Figure 17 , Figure 18 and Figure 19 Several forming surfaces 712 can be assembled to form a mold cavity, and two of the forming surfaces 712 have anti-misfit grooves 7120 to prevent workpiece misassembly. The anti-misfit grooves 7120 are adapted to the small support ears 112 of the workpiece. The small support ears 112 and the large support ears 111 are different in size, so only when the workpiece is correctly placed can it match the cavity and prevent misassembly. Moreover, after the small support ears 112 are assembled in the corresponding anti-misfit grooves 7120, they can also prevent the workpiece from rotating horizontally.
[0065] The reset mechanism 800 includes a support block 810 distributed on one side of the side mating block 730 and connected to the lower release plate 510; a plurality of assembly cavities arranged at intervals on the support block 810; a plurality of connecting rods 820 installed in each assembly cavity; and a reset spring 830 installed in each assembly cavity and sleeved onto the connecting rods 820. The end of the connecting rod 820 away from the reset spring 830 can be connected to the molding block 710. A backstop limiter 511 is distributed between the support block 810 and the molding block 710 to limit the outward movement distance of the molding block 710. A side block 513 connected to the lower release plate 510 is also provided between every two molding blocks 710. The side block 513 can slide with the molding block 710 and also serves to guide the movement direction of the molding block 710. In the mold-closed state, the inserter 400 is inserted between the abutment block 810 and the side mating block 730. Through the interaction of the first and second inclined wedge surfaces 410, the molding block 710 connected to the side mating block 730 can move towards the center support column 600, compressing the return spring 830. In the mold-open state, the inserter 400 retracts from between the abutment block 810 and the side mating block 730, and the molding block 710 returns to its original position under the action of the return spring 830. During mold closing, the inserter 400 pushes the molding block 710 towards the center support column 600 via the inclined wedge surfaces (completing the molding action), at which point the return spring 830 is compressed and stores energy. After mold opening, the inserter 400 disengages, the return spring 830 releases its elasticity, and the connecting rod 820 pulls the molding block 710 along the guide rail 7110 back to its initial position. Automated reset eliminates the need for manual intervention, improving production efficiency.
[0066] The lower ejector plate 510 is also provided with several guide base blocks 512, each guide base block 512 is provided with a cavity 5120, and the upper mold is provided with several guide pillars 250. The guide pillars 250 can be fitted into the cavity 5120 one by one to guide the mold closing or opening direction.
[0067] A cylinder 900 is mounted on the lower support plate 540. The cylinder 900 is connected to the central support column 600 through the ejector component 910. The cylinder 900 can drive the central support column 600 to reciprocate within the lower ejector plate 510. After the molding action is completed, the reset mechanism 800 causes the side push block 700 to return to its original position, and then the cylinder 900 is activated. The central support column 600 is lifted and moved towards the upper mold, lifting the workpiece on the central support column 600 for easy material removal by the operator.
[0068] This shrinking mold has the following characteristics: 1. In the open state, the bottom surface of the mold core 310 and the first segmented mold core 320 is lower than that of the second segmented mold core 330. When the mold is closed, the mold core 310 and the first segmented mold core 320 are first inserted into the inner cavity of the workpiece to complete the pre-positioning. Then, the second segmented mold core 330 is gradually expanded by the wedge drive to form a complete forming surface. This avoids the workpiece displacement caused by the "direct extrusion" of traditional molds. It is specifically designed for processing small speaker grilles 100, and is dedicated to this purpose, meeting the processing accuracy requirements of small speaker grilles 100. 2. The first segmented mold core 320 and the second segmented mold core 330 are staggered. When the mold is closed, they are combined to form a forming surface. When the mold is opened, they shrink and demold simultaneously. This can form complex internal cavity structures, suitable for the ears and full-circumference undercut forming of small speaker grilles 100, avoiding ear deformation or undercut defects. Third, the insert 400, through the cooperation of the first inclined wedge surface and the second inclined wedge surface 410, converts the vertical movement of the upper die into the horizontal driving force of the side push block 700, driving the forming block 710 to converge towards the central support column 600, forming a mold cavity surrounding the workpiece. No additional power source is required; the mechanical inclined surfaces amplify and stably transmit the force, ensuring that the side push block 700 and each segmented mold core synchronously extrude the workpiece.
[0069] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structure made using the contents of this utility model specification and drawings, whether directly or indirectly applied to other related technical fields, shall also be within the patent protection scope of this utility model.
Claims
1. A horn mesh necking mold, characterized in that, include: The upper mold includes an upper mold assembly, a punch core disposed on the upper mold assembly, and a plurality of inserts arranged at intervals around the punch core. The punch core includes a mold center core, a plurality of first segmented mold cores and a plurality of second segmented mold cores distributed interlaced around the mold center core, and an elastic reset assembly connected to the upper ends of the mold center core and the first segmented mold cores. In the open mold state, there is a height difference between the bottom surface of the mold center core and each first segmented mold core and the bottom surface of the second segmented mold cores, and the bottom surface of the mold center core and each first segmented mold core is closer to the lower mold in the vertical direction. The lower mold includes a lower mold assembly, a central support column disposed on the upper end of the lower mold assembly for carrying the workpiece, a plurality of side push blocks arranged at intervals around the central support column and capable of reciprocating in the direction of approaching or moving away from the central support column, and a reset mechanism corresponding to and connected to the side push blocks. In the mold-closed state, after the mold core and each first segment mold core enter the workpiece cavity, they can move away from the lower mold to drive the second segment mold cores to move away from the mold core, so that a plurality of second segment mold cores and a plurality of first segment mold cores cooperate with each other to form a forming surface for forming the workpiece; a plurality of inserts can drive the corresponding side push blocks to move towards the central support column, and the side push blocks that converge with each other can surround and form a mold cavity that encloses the workpiece. The side push blocks located outside the workpiece squeeze the workpiece and cooperate with the forming surface located inside the workpiece to process the narrowing of the workpiece.
2. The horn mesh narrowing mold according to claim 1, characterized in that: The punch core also includes an insert embedded in the upper die assembly. The insert has a through cavity that penetrates the insert vertically, and the inner wall of the through cavity has a plurality of first inclined grooves for assembling the first segmented die core and arranged at an inclination. Each first inclined groove has a limiting part that can prevent the first segmented die core from dislodging from the first inclined groove during the resetting process. The first segmented mold core includes a first segmented body having an inclined inner wall, a first dovetail protrusion extending from the first segmented body away from the inclined inner wall and having a shape adapted to the first inclined groove, and a first processing side surface disposed below the first dovetail protrusion.
3. The horn mesh narrowing mold according to claim 2, characterized in that: The second segmented mold core includes a second segmented body, a second dovetail protrusion protruding from the inner wall of the second segmented body and arranged at an inclination, an outer arc surface away from the second dovetail protrusion and whose shape is adapted to the through cavity, and a second processing side surface distributed below the outer arc surface and whose shape is consistent with the first processing side surface. A plurality of the first processing side surfaces and a plurality of the second processing side surfaces intersect each other and can be spliced together to form the molding processing surface.
4. The horn mesh narrowing mold according to claim 3, characterized in that: The outer periphery of the mold core is provided with several dovetail oblique grooves that are spaced apart and can be slidably connected to several second dovetail protrusions. Between each two adjacent dovetail oblique grooves, there is an inclined surface that is adapted to the inclined inner sidewall. When the mold core and each of the first segmented mold cores move away from the lower mold, the second segmented mold cores can be driven to move away from the mold core through the cooperation of the second dovetail protrusion and the dovetail oblique groove; after the mold is opened, the elastic reset component causes the mold core and each of the first segmented mold cores to reset to their initial positions along the mold opening direction, and drives the second segmented mold cores to move closer to the mold core through the cooperation of the second dovetail protrusion and the dovetail oblique groove.
5. The horn mesh narrowing mold according to claim 2, characterized in that: The upper mold assembly includes an upper mold base, an upper clamping plate, a stop plate, and an upper release plate arranged sequentially from top to bottom. The upper mold base and the upper clamping plate are embedded with an insert connected to the elastic reset assembly. The upper mold base and the stop plate are embedded with inserts, and the insert is embedded in the upper release plate.
6. The horn mesh narrowing mold according to claim 5, characterized in that: The elastic reset assembly includes a guide rod with one end passing through the insert and connected to the mold core, a positioning element connected to the guide rod to prevent the mold core from separating from the guide rod, a first spring disposed on the upper end of the guide rod and installed in the insert, a plurality of ejector pins corresponding to and abutting against the top surface of the first segmented mold core, and a plurality of second springs corresponding to and abutting against the upper ends of the ejector pins and installed in the insert. One end of the ejector pin passes through the insert and contacts the first segmented mold core. When the mold core and the first segmented mold core enter the inner cavity of the workpiece and abut against the workpiece, in the mold-closed state, the mold core can squeeze the first spring and the first segmented mold core can squeeze the second spring; in the mold-open state, the mold core resets under the action of the first spring and the first segmented mold core resets under the action of the second spring.
7. The horn mesh narrowing mold according to claim 5, characterized in that: One end of all the inserts is connected to the upper mold base. A plurality of third springs are provided between the upper ejector plate and the upper mold base. The upper ejector plate is provided with a through-hole. The end of the insert away from the upper mold base can enter / exit the through-hole. In the mold open state, the third springs are in a free state, so that the end of the insert away from the upper mold base is located in the through-hole. In the mold-closed state, the upper ejector plate moves toward the upper mold base and compresses the third spring, so that the end of the insert away from the upper mold base can extend out of the through-hole.
8. The horn mesh narrowing mold according to any one of claims 1-7, characterized in that: The lower mold assembly includes a lower ejector plate, a lower mold base, several lower pads, and a lower support plate arranged sequentially from top to bottom. One end of the central support column is mounted on the lower mold base, while the other end, away from the lower mold base, passes through the lower ejector plate and protrudes outside the lower ejector plate. A cylinder is mounted on the lower support plate, and the cylinder is connected to the central support column through a pusher. The cylinder can drive the central support column to reciprocate within the lower ejector plate.
9. The horn mesh narrowing mold according to claim 8, characterized in that: All of the side push blocks include a forming block connected to the lower release plate via a guide rail, a mounting position located on the forming block and distributed away from the central support column, and a side mating block installed on the mounting position. The molding end face of the molding block includes an arc surface that abuts against the central support column and is adapted in shape, and a molding surface that is higher than the central support column. The shape of the molding surface is adapted to the shape of the molding processing surface. Several molding surfaces can be assembled to form the mold cavity. Two of the molding surfaces are provided with anti-misfit grooves to prevent workpiece misassembly. The side mating block is provided with a first inclined wedge surface, and the corresponding position of the inserter is provided with a second inclined wedge surface. When the mold is closed, the first inclined wedge surface and the second inclined wedge surface cooperate with each other to drive the molding block to move toward the direction closer to the central support column.
10. The horn mesh narrowing mold according to claim 9, characterized in that: The reset mechanism includes a support block distributed on one side of the side mating block and connected to the lower release plate, a plurality of assembly cavities arranged at intervals on the support block, a plurality of connecting rods installed in the assembly cavities one by one, and a reset spring installed in the assembly cavities one by one and sleeved on the connecting rods. The end of the connecting rod away from the reset spring can be connected to the molding block. In the mold-closed state, the inserter is inserted between the abutment block and the side mating block. Through the mutual cooperation of the first inclined wedge and the second inclined wedge, the molding block connected to the side mating block can move toward the direction closer to the central support column and compress the return spring. In the open mold state, the insert retracts from between the abutment block and the side mating block, and the molding block is reset by the action of the return spring.