A metal can stamping die with elastic bottom

Abstract

A stamping die for a metal can with an elastic bottom includes a first die for punching and stretching a stamped object, a second die for re-stretching (or multiple stretching) the stamped object, a third die for forming the bottom of the stamped object, a fourth die for expanding the diameter of the can mouth of the stamped object and re-forming the bottom, and a fifth die for trimming the stamped object. The third die of the present invention can prevent the edge of the mouth of the stamped object from being squeezed and deformed when the bottom ring groove is stamped through the air-avoiding groove, thereby making a prerequisite for realizing elastic deformation of the bottom. The fourth die can expand the diameter of the metal can mouth through the coordination of the diameter expansion groove and the lower diameter expansion die, so that the can mouth is further expanded. At the same time, after the bottom ring groove is stamped twice, the local strength and durability of the bottom stress area can be changed. In the process of expanding the diameter, a pulling force will also be generated on the bottom of the metal can, so that the bottom is adjusted in micro-distance, thereby changing the elasticity of the bottom, causing it to produce elastic deformation, so that it has resilience.

Description

Technical Field

[0001] The invention relates to the technical field of molds, in particular to a metal can stamping mold with an elastic bottom. Background Art

[0002] Metal cans are divided into two-piece cans and three-piece cans. The body of a metal three-piece can consists of a top cover, a can body and a bottom cover. Its manufacturing process includes "rounding, welding, repainting, drying, flanging, bottom cover glue injection and drying, can sealing", etc., which is a cumbersome process. The body of a metal two-piece can consists of a top cover and a can body. The can body is formed by integrated stamping and stretching, and its manufacturing process is relatively simple.

[0003] The can bodies produced by the above two metal canning processes may have no annular ring at the bottom, or may have an annular ring that only serves to strengthen the pressure-bearing function. After filling and sterilization, the can body may expand due to high temperature and cause irreversible deformation and bulging.

[0004] Therefore, in order to prevent the can body from deforming and bulging after being exposed to high temperature, the can body needs to have the property of elastic deformation. However, the existing can body is generally required to be relatively light and thin and able to withstand high pressure. At the same time, the existing mold technology realizes that the annular ring at the bottom of the metal can is rigid during the stamping process. Therefore, a mold is needed that can change the bottom characteristics of the metal can body while making it thinner and having better pressure-bearing effect during the stamping process, so that the metal can has the ability to prevent deformation and bulging. Summary of the invention

[0005] The purpose of the present invention is to provide a metal can stamping die with an elastic bottom, which solves the problem that the bottom of the metal can body does not have elastic deformation ability during the stamping process.

[0006] To achieve the above-mentioned object, the present invention provides a metal can stamping die with an elastic bottom, comprising a first sequential die for punching and stretching a stamped object, a second sequential die for re-stretching the stamped object, a third sequential die for forming the bottom of the stamped object, a fourth sequential die for expanding the diameter of the can mouth of the stamped object and re-forming the bottom, and a fifth sequential die for trimming the stamped object.

[0007] The third sequential mold includes an upper molding demoulding component, a first molding mold, a lower molding demoulding component and a first molding mold core.

[0008] The upper molding demoulding component and the lower molding demoulding component are arranged relative to each other and perform pressing / separating movements.

[0009] The first molding die is fixedly connected to the upper molding demoulding component, a side of the first molding die facing the lower molding demoulding component is provided with a plurality of stepped annular grooves, and an inner wall of one end of the upper molding demoulding component close to the lower molding demoulding component is provided with an air avoidance groove,

[0010] The first molding mold core is fixedly connected to the lower molding demoulding component, and a flange is provided on a side of the first molding mold core facing the upper molding demoulding component, and the flange corresponds to the stepped annular groove;

[0011] The upper molding demoulding assembly drives the first molding die and the first molding die core to perform pressing / separating movements,

[0012] When the first molding die and the first molding die core are pressed together, the edge of the mouth of the stamping object is in the air-avoiding groove, and the bottom of the stamping object abuts against the stepped annular groove and the flange respectively; when the first molding die and the first molding die core are separated, the lower molding demoulding assembly lifts the stamping object;

[0013] The fourth sequential die includes an upper forming and expanding assembly, a second forming die, a lower forming and expanding assembly, a second forming die core and a lower expanding die.

[0014] The upper forming and expanding assembly is arranged relative to the lower forming and expanding assembly and performs pressing / separating motions, the second forming die has the same structure as the first forming die, and the second forming die core has the same structure as the first forming die core.

[0015] The second molding die is fixedly connected to the upper molding diameter expansion component, and an expansion groove is provided inside one end of the upper molding diameter expansion component close to the lower molding diameter expansion component.

[0016] One end of the second molding die core is fixedly connected to one end of the lower diameter expansion die, and the other end of the lower diameter expansion die is fixedly connected to the lower molding diameter expansion assembly, the diameter expansion groove corresponds to the outer contour of the lower diameter expansion die, and the diameter of the lower diameter expansion die is larger than the diameter of the second molding die core;

[0017] The upper forming expansion assembly drives the second forming die and the second forming die core to perform pressing / separating movements,

[0018] When the second molding die is pressed against the second molding die core, the edge of the mouth of the stamping object is located at the connection between the upper molding expansion component and the lower molding expansion component, and the side walls of the mouth of the stamping object are respectively abutted against the lower expansion die and the expansion groove. When the second molding die and the second molding die core are separated, the lower molding expansion component lifts the stamping object.

[0019] Preferably, the upper molding demoulding assembly comprises a first upper mold base, a first mouth clamp and a first plug rod.

[0020] The first upper die seat is fixedly connected to one end of the first mouth clamping die, and the inner wall of the other end of the first mouth clamping die is provided with a space-avoiding groove.

[0021] One end of the first plug rod passes through the first upper die seat and moves outward / backward relative to the first upper die seat, and the other end of the first plug rod is fixedly connected to the first forming die.

[0022] When the first molding die and the first molding die core are pressed together, the first mouth clamping die abuts against the lower molding demolding assembly;

[0023] The upper forming and expanding assembly includes a second upper die seat, a second mouth clamp die and a second plug rod.

[0024] The second upper die seat is fixedly connected to one end of the second mouth clamping die, and the inner wall of the other end of the second mouth clamping die is provided with a diameter expansion groove.

[0025] One end of the second plug rod passes through the second upper die base and moves in extension / retraction relative to the second upper die base, and the other end of the second plug rod is fixedly connected to the second molding die;

[0026] When the second molding die and the second molding die core are pressed together, the diameter expansion groove abuts against the lower molding diameter expansion component.

[0027] Preferably, an air slide is provided in the first upper die seat.

[0028] The first plug rod comprises a rod body and a plug column, one end of the rod body is fixedly connected to the first molding die, and the other end of the rod body is fixedly connected to the plug column, and the plug column slides in the air slide;

[0029] The second upper die base structure is the same as the first upper die base structure, and the second stopper rod structure is the same as the first stopper rod structure.

[0030] Preferably, the first upper die seat comprises a die handle and an upper connecting seat fixedly connected to the die handle.

[0031] An air slide is provided in the mold handle.

[0032] The upper connecting seat is provided with a central through slot and a positioning slot, the mold handle passes through the central through slot and is fixedly connected to the upper connecting seat, the rod body passes through the central through slot, the inner diameter of the central through slot is smaller than the outer diameter of the plug, and the positioning slot is connected to the first mouth clamp.

[0033] Preferably, the first upper die seat further comprises a connecting block, wherein the connecting block is fixedly connected to the upper connecting seat to form a fixed cavity.

[0034] The outer wall of the mold handle is provided with a convex edge, the mold handle passes through the upper connecting seat, and the convex edge is located in the fixed cavity.

[0035] Preferably, the lower molding demoulding assembly includes a first lower mold base, a first piston cylinder, a first piston rod and a first demoulding module.

[0036] One end of the first lower die base is fixedly connected to the first piston cylinder, and the other end of the first lower die base is fixedly connected to the first molding die core.

[0037] One end of the first piston rod is connected to the first piston cylinder and performs extension / retraction movement, and the other end of the first piston rod passes through the first lower die base and is fixedly connected to the first stripping die block;

[0038] When the first molding die and the first molding die core are pressed together, the first stripping die is in contact with the first mouth clamping die.

[0039] When the first forming die and the first forming die core are separated, the first piston rod drives the first stripping die block to lift the punched object;

[0040] The lower forming and expanding assembly includes a second lower die seat, a second piston cylinder, a second piston rod and a second stripping module.

[0041] One end of the second lower die base is fixedly connected to the second piston cylinder, and the other end of the second lower die base is fixedly connected to the lower diameter expansion die.

[0042] One end of the second piston rod is connected to the second piston cylinder and performs extension / retraction movement, and the other end of the second piston rod passes through the second lower die base and is fixedly connected to the second stripping die block;

[0043] When the second molding die and the second molding die core are pressed together, the second stripping die block abuts against the second mouth clamping die, and the diameter expansion groove abuts against the lower diameter expansion die.

[0044] When the second molding die and the second molding die core are separated, the second piston rod drives the second stripping die block to lift the punched object.

[0045] Preferably, the first piston rod comprises a connecting rod and a piston block, the piston block is fixedly connected to one end of the connecting rod, the piston block slides in the first piston cylinder, and the other end of the connecting rod passes through the first lower die seat and is fixedly connected to the first stripping die block;

[0046] The second piston rod has the same structure as the first piston rod.

[0047] Preferably, the first lower mold base includes a first connecting base, a first fixing base and a first outer cover.

[0048] One end of the first connecting seat is fixedly connected to the first piston cylinder, and the other end of the first connecting seat is fixedly connected to the first fixing seat and the first outer cover respectively, the first outer cover is sleeved on the outside of the first fixing seat, the first fixing seat is fixedly connected to the first forming mold core, and the first stripping module is located between the first outer cover and the first fixing seat;

[0049] The second lower mold base includes a second connecting base and a second outer cover.

[0050] One end of the second connecting seat is fixedly connected to the second piston cylinder, and the other end of the second connecting seat is fixedly connected to the second outer cover. The second outer cover is sleeved on the outer side of the lower diameter expansion die, and the second stripping module is located between the second outer cover and the lower diameter expansion die.

[0051] Preferably, the first stripping module is in a "convex" shape.

[0052] A convex edge is provided at one end of the first outer cover away from the first connecting seat, and the convex edge abuts against the first stripping module;

[0053] The second stripping module has the same structure as the first stripping module, and the second outer cover has the same structure as the first outer cover.

[0054] Preferably, the second connecting seat is provided with a limiting groove, and the second outer cover is located in the limiting groove.

[0055] Beneficial effects of the present invention:

[0056] 1. The third die of the present invention ensures the consistency of the bottom shape of the stamped object through the precise matching of multiple stepped ring grooves and flanges, and the dynamic coordinated movement of the upper molding demoulding component and the lower molding demoulding component ensures the continuity of the mold opening and closing. After the stamping is completed, the stamped object can be automatically separated to facilitate the transfer of the stamped object to the next die for stamping. At the same time, the design of the air-avoiding groove can prevent the edge of the mouth of the stamped object from being squeezed during the stamping of the third die, avoiding its deformation, and making a prerequisite for realizing elastic deformation of the bottom.

[0057] 2. The fourth sequence mold of the present invention can expand the diameter of the metal can mouth through the coordination of the expansion groove and the lower expansion mold, so that the mouth of the can body is further expanded. In addition, due to the design of the second forming mold and the second forming mold core, the bottom of the stamping object can be stamped twice; at the same time, because during the expansion process, the diameter of the lower expansion mold is larger than the second forming mold core, the mouth of the metal can will be slightly expanded during stamping, and then the expansion of the can mouth can be achieved through the cooperation of the expansion groove. During the expansion process, a pulling force will also be generated on the bottom of the metal can, so that the bottom of the metal can is slightly adjusted during the secondary stamping, thereby changing the elasticity of the bottom, causing it to produce elastic deformation, so that it has resilience.

[0058] 3. After the secondary stamping, the bottom ring groove of the metal can of the present invention can be adjusted and shaped to improve the dimensional accuracy and surface roughness of the manufactured parts, change the local strength and durability of the bottom stress area, and thus improve the overall performance and load-bearing capacity of the metal can.

[0059] 4. When the metal can body of the present invention is filled and sterilized at high temperature, the gas expansion inside the can body will cause the bottom of the can to bulge outward. After the high temperature subsides, the bottom of the can can return to its original shape due to its resilience. The bottom of the can body has resilience, which can alleviate expansion and deformation. Therefore, the can body can be produced with a lower thickness of sheet material, that is, the production of can bodies of the same specifications can save more materials.

[0060] 5. The third and fourth molds of the present invention have roughly the same structure, which is conducive to modular processing of the structure and can facilitate daily maintenance; at the same time, the modular design also simplifies the complexity of the overall design and optimizes the labor intensity of installation and debugging, which is convenient for improving the performance of the entire mechanical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0062] Figure 1 It is a schematic diagram of the overall process of the present invention.

[0063] Figure 2 It is a connection schematic diagram of the third sequence mold when pressing together the present invention.

[0064] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0065] Figure 4 It is a schematic diagram of the connection when the fourth sequence mold is pressed together in the present invention.

[0066] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0067] Figure 6 The structure of the upper molding demoulding component of the present invention is schematically shown. Figure 1 .

[0068] Figure 7 The structure of the upper molding demoulding component of the present invention is schematically shown. Figure 2 .

[0069] Figure 8 It is a structural schematic diagram of the upper forming and diameter expanding component of the present invention.

[0070] Fig. 9 yes Figure 6 Enlarged view of point C in the middle.

[0071] Fig.10 It is a structural schematic diagram of the lower forming and demoulding component of the present invention.

[0072] Fig.11 It is a structural schematic diagram of the lower forming and expanding component of the present invention.

[0073] Fig.12 yes Fig.10 Enlarged view of point D in the middle.

[0074] In the figure: the first sequence mold 1; the second sequence mold 2; the third sequence mold 3; the upper molding demoulding assembly 31; the first upper mold seat 311; the mold handle 3111; the air slide 3111a; the convex edge 3111b; the upper connecting seat 3112; the middle through groove 3112a; the positioning groove 3112b; the connecting block 3113; the fixed cavity 3113a; the first mouth clamp 312; the air avoidance groove 3121; the first plug rod 313; the rod body 3131; the plug rod 3132; the first molding mold 32; the stepped annular groove 321; the lower molding demoulding assembly 33; the first lower mold seat 331; the first connecting seat 3311; the first fixed seat 3312; the first outer cover 3313; the convex edge 33 13a; first piston cylinder 332; first piston rod 333; connecting rod 3331; piston block 3332; first stripping module 334; first molding core 34; flange 341; fourth sequence mold 4; upper molding expansion assembly 41; second upper mold base 411; second mouth clamping mold 412; expansion groove 4121; second plug rod 413; second molding mold 42; lower molding expansion assembly 43; second lower mold base 431; second connecting base 4311; limiting groove 4311a; second outer cover 4312; second piston cylinder 432; second piston rod 433; second stripping module 434; second molding core 44; lower expansion mold 45; fifth sequence mold 5. DETAILED DESCRIPTION

[0075] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0076] like Figure 1 As shown, a stamping die for a metal can with an elastic bottom includes a first sequence die 1 for punching and stretching a punched object, a second sequence die 2 for re-stretching the punched object, a third sequence die 3 for forming the bottom of the punched object, a fourth sequence die 4 for expanding the diameter of the can mouth and re-forming the bottom of the punched object, and a fifth sequence die 5 for trimming the punched object. The present invention subdivides the stamping process of the metal can into multiple stages (from punching and shearing to final trimming) by adopting a multi-sequence die structure, greatly shortening the manufacturing cycle of a single product, thereby improving the continuity and automation of the production line, and effectively improving the overall efficiency of the production line.

[0077] Specifically, the function of the first die 1 of the present invention is to punch out a disc sheet from a whole large sheet, and then stretch the disc sheet into a cup-shaped can body. The function of the second die 2 is to stretch the cup-shaped can body punched by the first die 1 again, so that the diameter of the can body is reduced and the height of the can body is increased; similarly, the second die 2 can also include multiple dies, and the punched object can be stretched multiple times according to actual production needs. The function of the third die 3 is to form several circles of stepped annular rings at the bottom of the can body. The function of the fourth die 4 is to expand the mouth of the can body on the one hand; on the other hand, by micro-stretching the bottom of the formed can body again, a rebound force is generated at the bottom. The function of the fifth die 5 is to shear off the irregular edges of the outer ring of the mouth of the can body for trimming and forming.

[0078] like Figure 2-Figure 3 As shown, the third sequential mold 3 includes an upper molding demoulding component 31, a first molding mold 32, a lower molding demoulding component 33 and a first molding mold core 34. The upper molding demoulding component 31 and the lower molding demoulding component 33 are arranged relative to each other and perform pressing / separating movements. The first molding mold 32 is fixedly connected to the upper molding demoulding component 31. A side of the first molding mold 32 facing the lower molding demoulding component 33 is provided with a plurality of stepped annular grooves 321. An inner wall of one end of the upper molding demoulding component 31 close to the lower molding demoulding component 33 is provided with an air avoidance groove 3121. The first molding mold core 34 and the lower molding demoulding component 33 are connected to each other. The first molding core 34 is fixedly connected, and a flange 341 is provided on one side of the first molding core 34 facing the upper molding demolding component 31, and the flange 341 corresponds to the stepped annular groove 321; the upper molding demolding component 31 drives the first molding die 32 and the first molding die core 34 to perform pressing / separating movements. When the first molding die 32 and the first molding die core 34 are pressed together, the edge of the mouth of the stamping object is in the air avoidance groove 3121, and the bottom of the stamping object is respectively in contact with the stepped annular groove 321 and the flange 341. When the first molding die 32 and the first molding die core 34 are separated, the lower molding demolding component 33 lifts up the stamping object. The third sequence mold 3 of the present invention ensures the uniformity of the bottom shape of the stamped object through the precise matching of the multi-step ring groove 321 and the flange 341, and the dynamic coordinated movement of the upper molding demoulding component 31 and the lower molding demoulding component 33 ensures the continuity of the mold opening and closing, and can automatically separate the stamped object after the stamping is completed, so as to facilitate the transfer of the stamped object to the next sequence mold for stamping. At the same time, the design of the air-avoiding groove 3121 can prevent the edge of the mouth of the stamped object from being squeezed when the third sequence mold 3 is stamped, avoiding its deformation, and making a prerequisite for realizing elastic deformation of the bottom.

[0079] like Figure 4-Figure 5As shown, the fourth sequential mold 4 includes an upper forming diameter expansion component 41, a second forming mold 42, a lower forming diameter expansion component 43, a second forming mold core 44 and a lower diameter expansion mold 45. The upper forming diameter expansion component 41 and the lower forming diameter expansion component 43 are arranged relative to each other and perform pressing / separating movements. The second forming mold 42 has the same structure as the first forming mold 32, and the second forming mold core 44 has the same structure as the first forming mold core 34. The second forming mold 42 is fixedly connected to the upper forming diameter expansion component 41, and an end of the upper forming diameter expansion component 41 close to the lower forming diameter expansion component 43 is provided with an expanding groove 4121. One end of the second forming mold core 44 is fixedly connected to one end of the lower diameter expansion mold 45. The lower diameter expansion mold 4 The other end is fixedly connected to the lower forming diameter expansion component 43, the diameter expansion groove 4121 corresponds to the outer contour of the lower diameter expansion die 45, and the diameter of the lower diameter expansion die 45 is larger than the diameter of the second forming die core 44; the upper forming diameter expansion component 41 drives the second forming die 42 and the second forming die core 44 to perform pressing / separating movements. When the second forming die 42 and the second forming die core 44 are pressed together, the edge of the mouth of the punch is located at the connection between the upper forming diameter expansion component 41 and the lower forming diameter expansion component 43, and the side wall of the mouth of the punch is respectively in contact with the lower diameter expansion die 45 and the diameter expansion groove 4121. When the second forming die 42 and the second forming die core 44 are separated, the lower forming diameter expansion component 43 lifts the punch. The present invention can achieve diameter expansion of the mouth of the metal can through the coordinated cooperation of the diameter expansion groove 4121 and the lower diameter expansion die 45, so that the mouth of the can body is further expanded. In addition, due to the design of the second forming die 42 and the second forming die core 44, the bottom of the stamped object can be stamped twice; at the same time, because the diameter of the lower expanding die 45 is larger than the second forming die core 44 during the expansion process, the mouth of the metal can will be slightly expanded during the stamping, and then the expansion of the can mouth can be achieved through the cooperation of the expanding groove 4121. During the expansion process, a pulling force will also be generated on the bottom of the metal can, so that the bottom of the metal can is slightly adjusted during the secondary stamping, thereby changing the elasticity of the bottom, causing it to produce elastic deformation, so that it has resilience.

[0080] like Figure 6As shown, the upper molding demolding assembly 31 includes a first upper mold base 311, a first mouth clamp 312 and a first plug rod 313. The first upper mold base 311 is fixedly connected to one end of the first mouth clamp 312. The inner wall of the other end of the first mouth clamp 312 is provided with an air avoidance groove 3121. One end of the first plug rod 313 passes through the first upper mold base 311 and extends / retracts relative to the first upper mold base 311. The other end of the first plug rod 313 is fixedly connected to the first molding die 32. When the first molding die 32 and the first molding die core 34 are pressed together, the first mouth clamp 312 abuts against the lower molding demolding assembly 33. This molding demolding assembly adopts a fixed connection method between the first plug rod 313 and the first molding die 32, and a design of an air avoidance groove 3121 on the inner wall of the first mouth clamp 312, which provides the metal can with the possibility of elastic deformation of the bottom. At the same time, by automatically controlling the extension and retraction movement of the first plug rod 313, the mold can be quickly opened and closed, which reduces manual operation time and effectively improves production efficiency.

[0081] The bottom of two-piece cans produced by traditional technology is not elastic, so the bottom of the can needs to have a higher pressure-bearing performance to prevent it from expanding and bulging during high-temperature sterilization. This requires that the thickness of the can-making sheet must reach a certain thickness (such as 0.22mm) to ensure that the produced can body meets the pressure-bearing requirements. Figure 7 As shown, the upper forming diameter expansion component 41 of the present invention includes a second upper die seat 411, a second mouth clamping die 412 and a second plug rod 413. The second upper die seat 411 is fixedly connected to one end of the second mouth clamping die 412. The inner wall of the other end of the second mouth clamping die 412 is provided with a diameter expansion groove 4121. One end of the second plug rod 413 passes through the second upper die seat 411 and extends / retracts relative to the second upper die seat 411. The other end of the second plug rod 413 is fixedly connected to the second forming die 42. When the second forming die 42 and the second forming die core 44 are pressed together, the diameter expansion groove 4121 abuts against the lower forming diameter expansion component 43. The present invention can not only realize the diameter expansion of the can mouth of the metal can body, but also generate a pulling force on the bottom through the linkage cooperation between the diameter expansion groove 4121 and the lower diameter expansion die 45, so that the bottom plate is locally deformed by force, so that the can body has elastic deformation characteristics and can effectively resist high temperature expansion. At the same time, after the secondary stamping of the bottom ring groove, the size and shape of the groove can be adjusted and shaped, the dimensional accuracy and surface roughness of the parts can be improved, and the local strength and durability of the bottom stress area can be changed, thereby improving the overall performance and load-bearing capacity of the metal can. When the can body is sterilized at high temperature during filling, the gas expansion inside the can body will cause the bottom of the can to bulge outward. After the high temperature subsides, the bottom of the can can return to its original shape due to its resilience, which does not affect the shape of the can body and the properties of the filling.

[0082] At the same time, the bottom of the can body produced by the mold of the present invention has resilience, which can alleviate expansion deformation, so the can body produced by a lower thickness sheet (such as 0.18mm) can withstand the expansion pressure during high-temperature sterilization, that is, the production of can bodies of the same specifications can save more materials.

[0083] Specifically, Figure 8 As shown, the first upper die seat 311 is provided with an air slide 3111a, and the first plug rod 313 includes a rod body 3131 and a plug column 3132. One end of the rod body 3131 is fixedly connected to the first molding die 32, and the other end of the rod body 3131 is fixedly connected to the plug column 3132, and the plug column 3132 slides in the air slide 3111a. The present invention introduces a linkage mechanism between the first upper die seat 311 and the first plug rod 313, making the entire production process more automated. In addition, the first upper die seat 311 is connected to the upper worktable of the cylinder punching machine (not shown in the figure), and compressed air is used as the power source. The structure is relatively simple, the failure rate is low, and maintenance is convenient, which is conducive to reducing the cost of long-term operation.

[0084] The second upper die seat 411 has the same structure as the first upper die seat 311, and the second plug rod 413 has the same structure as the first plug rod 313. The first upper die seat and the second upper die seat 411 have the same structure, which is conducive to modular processing of the structure and can facilitate daily maintenance. At the same time, the modular design also simplifies the complexity of the overall design and optimizes the labor intensity of installation and adjustment, which is convenient for improving the performance of the entire mechanical system.

[0085] In one embodiment, the first upper mold base 311 includes a mold handle 3111 and an upper connecting seat 3112 fixedly connected to the mold handle 3111, an air slide 3111a is provided in the mold handle 3111, and the upper connecting seat 3112 is provided with a middle through groove 3112a and a positioning groove 3112b, the mold handle 3111 passes through the middle through groove 3112a and is fixedly connected to the upper connecting seat 3112, the rod body 3131 passes through the middle through groove 3112a, the inner diameter of the middle through groove 3112a is smaller than the outer diameter of the plug 3132, and the positioning groove 3112b is connected to the first mouth clamp 312. The first upper mold base 311 is formed by a mold handle 3111 and an upper connecting seat 3112 being fixedly connected. By setting an air slide 3111a on the mold handle 3111, the mold handle 3111 can achieve an airtight effect similar to that of a cylinder, making the rod body 3131 more powerful in extension and contraction. At the same time, the mold handle 3111 is independently designed to reduce the difficulty of component production and facilitate daily maintenance and replacement. Furthermore, the upper connecting seat 3112 is also provided with a positioning groove 3112b, which can facilitate the rapid positioning of the first mouth clamp 312 during installation and debugging, which is beneficial to improving mold accuracy and avoiding the problem of repeated debugging.

[0086] In one embodiment, referring to Figure 6 and Fig. 9The first upper die seat 311 further includes a connecting block 3113, which is fixedly connected to the upper connecting seat 3112 and forms a fixed cavity 3113a. The outer wall of the die handle 3111 is provided with a convex edge 3111b, and the die handle 3111 passes through the upper connecting seat 3112, and the convex edge 3111b is in the fixed cavity 3113a. The connecting block 3113 of the present application can be connected to the upper worktable of the punching machine (not shown in the figure), and the convex edge 3111b of the outer wall of the die handle 3111 can be fixed through the fixed cavity 3113a, which can effectively prevent the die handle 3111 from falling off during operation, and further improve the stability of the device.

[0087] like Fig.10 As shown, the lower molding demolding assembly 33 includes a first lower mold base 331, a first piston cylinder 332, a first piston rod 333 and a first demolding module 334. One end of the first lower mold base 331 is fixedly connected to the first piston cylinder 332, and the other end of the first lower mold base 331 is fixedly connected to the first molding mold core 34. One end of the first piston rod 333 is connected to the first piston cylinder 332 and extends / retracts. The other end of the first piston rod 333 passes through the first lower mold base 331 and is fixedly connected to the first demolding module 334. When the first molding mold 32 and the first molding mold core 34 are pressed together, the first demolding module 334 abuts against the first mouth clamp 312. When the first molding mold 32 and the first molding mold core 34 are separated, the first piston rod 333 drives the first demolding module 334 to lift the stamping object. The present invention adopts a lower molding demoulding component 33 with a higher degree of automation, and realizes automatic demoulding of the stamped object through the extension / retraction movement of the first piston rod 333, avoiding the damage to the can body that may be caused by the traditional demoulding method, greatly reducing manual intervention, optimizing the production process, and improving the production speed.

[0088] like Fig.11As shown, the lower forming and expanding assembly 43 includes a second lower die seat 431, a second piston cylinder 432, a second piston rod 433 and a second stripping module 434. One end of the second lower die seat 431 is fixedly connected to the second piston cylinder 432, and the other end of the second lower die seat 431 is fixedly connected to the lower expanding die 45. One end of the second piston rod 433 is connected to the second piston cylinder 432 and extends / retracts, and the other end of the second piston rod 433 passes through the second lower die seat 431 and is fixedly connected to the second stripping module 434. When the second forming die 42 and the second forming die core 44 are pressed together, the second stripping module 434 abuts against the second mouth clamp 412, and the expanding groove 4121 abuts against the lower expanding die 45. When the second forming die 42 and the second forming die core 44 are separated, the second piston rod 433 drives the second stripping module 434 to lift the punched object. The present invention realizes the precise expansion and elastic deformation characteristics of the bottom of the tank body through the linkage of the second piston cylinder 432 and the piston rod, in cooperation with the lower expansion die 45 and the second forming die core 44. In addition, with the second demolding module 434 and the second piston rod 433, the stamping object can be automatically demolded after the stamping is completed, reducing manual intervention and operation, and improving the degree of mold automation.

[0089] Further, see Fig.10 The first piston rod 333 includes a connecting rod 3331 and a piston block 3332. The piston block 3332 is fixedly connected to one end of the connecting rod 3331. The piston block 3332 slides in the first piston cylinder 332. The other end of the connecting rod 3331 passes through the first lower die base 331 and is fixedly connected to the first demolding module 334. The second piston rod 433 has the same structure as the first piston rod 333. By controlling the air intake and air outlet of the first piston cylinder 332, the repeated action of the piston rod can be accurately realized, and the demolding effect of the stamping object can be effectively achieved. The movement mechanism of the piston rod assembly is simple and reliable, making the installation, debugging and maintenance of the mold more convenient.

[0090] Further, see Fig.10The first lower die base 331 includes a first connecting base 3311, a first fixed base 3312 and a first outer cover 3313. One end of the first connecting base 3311 is fixedly connected to the first piston cylinder 332, and the other end of the first connecting base 3311 is fixedly connected to the first fixed base 3312 and the first outer cover 3313 respectively. The first outer cover 3313 is sleeved on the outside of the first fixed base 3312. The first fixed base 3312 is fixedly connected to the first forming mold core 34, and the first stripping module 334 is located between the first outer cover 3313 and the first fixed base 3312. The first connecting base 3311 can be fixedly connected to the lower workbench of the punching machine (not shown in the figure) and the first forming mold core 34 through the first fixed base 3312, which can support the model. Through the connection between the first fixed base 3312 and the first outer cover 3313, the first stripping module 334 can be accurately controlled, thereby realizing rapid demolding of the punched object and reducing waiting time. At the same time, the first fixing seat 3312 can also guide the first stripping module 334 to prevent it from tilting during the up and down movement, making it smoother and more stable.

[0091] Further, see Fig.11 The second lower die base 431 includes a second connecting base 4311 and a second outer cover 4312. One end of the second connecting base 4311 is fixedly connected to the second piston cylinder 432, and the other end of the second connecting base 4311 is fixedly connected to the second outer cover 4312. The second outer cover 4312 is sleeved on the outer side of the lower diameter expansion die 45, and the second stripping module 434 is located between the second outer cover 4312 and the lower diameter expansion die 45. Since the diameters of the lower diameter expansion die 45 and the second molding die core 44 are different, the second outer cover 4312 is tightly connected to the second stripping module 434 to limit and guide it, so as to prevent the second stripping module 434 from tilting during the up and down movement, and to ensure that the device operates stably.

[0092] like Fig.12 As shown, the first stripping module 334 is in a "convex" shape, and a convex edge 3313a is provided at one end of the first outer cover 3313 away from the first connecting seat 3311, and the convex edge 3313a abuts against the first stripping module 334; the second stripping module 434 has the same structure as the first stripping module 334, and the second outer cover 4312 has the same structure as the first outer cover 3313. The "convex" shape design can make the first stripping module 334 and the second stripping module 434 play a limiting role in the process of lifting the stamping object, preventing it from exceeding the range of the outer cover.

[0093] Reference Fig.11 The second connection seat 4311 is provided with a limiting groove 4311a, and the second outer cover 4312 is located in the limiting groove 4311a. The present invention can facilitate the installation and fixation of the second outer cover 4312 through the pre-processed limiting groove 4311a, improve the installation accuracy of the mold, and make it more tightly connected with the second stripping module 434.

[0094] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A stamping die for a metal can with an elastic bottom, comprising a first die (1) for punching and stretching a stamped object, a second die (2) for re-stretching the stamped object, a third die (3) for forming the bottom of the stamped object, a fourth die (4) for expanding the diameter of the can mouth and re-forming the bottom of the stamped object, and a fifth die (5) for trimming the stamped object, characterized in that: The third sequential mold (3) comprises an upper molding demoulding component (31), a first molding mold (32), a lower molding demoulding component (33) and a first molding mold core (34). The upper molding and demoulding component (31) and the lower molding and demoulding component (33) are arranged relative to each other and perform a pressing / separating movement. The first molding die (32) is fixedly connected to the upper molding demoulding component (31); a surface of the first molding die (32) facing the lower molding demoulding component (33) is provided with a plurality of stepped annular grooves (321); an inner wall of one end of the upper molding demoulding component (31) close to the lower molding demoulding component (33) is provided with a clearance groove (3121); The first molding mold core (34) is fixedly connected to the lower molding demoulding component (33); a flange (341) is provided on a side of the first molding mold core (34) facing the upper molding demoulding component (31); the flange (341) corresponds to the stepped annular groove (321); The upper molding demoulding component (31) drives the first molding die (32) and the first molding die core (34) to perform a pressing / separating movement. When the first forming die (32) and the first forming die core (34) are pressed together, the edge of the mouth of the punch is located in the air avoidance groove (3121), and the bottom of the punch is respectively in contact with the stepped annular groove (321) and the flange (341); when the first forming die (32) and the first forming die core (34) are separated, the lower forming demoulding assembly (33) lifts up the punch; The fourth sequential die (4) comprises an upper forming and diameter-expanding component (41), a second forming die (42), a lower forming and diameter-expanding component (43), a second forming die core (44) and a lower diameter-expanding die (45). The upper forming and expanding assembly (41) and the lower forming and expanding assembly (43) are arranged relative to each other and perform pressing / separating movements, the second forming die (42) and the first forming die (32) have the same structure, and the second forming die core (44) and the first forming die core (34) have the same structure. The second molding die (42) is fixedly connected to the upper molding diameter-expanding component (41); an expansion groove (4121) is provided inside one end of the upper molding diameter-expanding component (41) close to the lower molding diameter-expanding component (43). One end of the second molding die core (44) is fixedly connected to one end of the lower diameter expansion die (45), and the other end of the lower diameter expansion die (45) is fixedly connected to the lower molding diameter expansion component (43); the diameter expansion groove (4121) corresponds to the outer contour of the lower diameter expansion die (45); and the diameter of the lower diameter expansion die (45) is greater than the diameter of the second molding die core (44); The upper forming and expanding assembly (41) drives the second forming die (42) and the second forming die core (44) to perform a pressing / separating movement. When the second forming die (42) and the second forming die core (44) are pressed together, the edge of the mouth of the punch is located at the connection between the upper forming diameter expansion component (41) and the lower forming diameter expansion component (43), and the side walls of the mouth of the punch are respectively in contact with the lower diameter expansion die (45) and the diameter expansion groove (4121); when the second forming die (42) and the second forming die core (44) are separated, the lower forming diameter expansion component (43) lifts up the punch; The upper molding demoulding assembly (31) comprises a first upper mold base (311), a first mouth clamping mold (312) and a first plug rod (313). The first upper die seat (311) is fixedly connected to one end of the first mouth clamping die (312), and the inner wall of the other end of the first mouth clamping die (312) is provided with a space-avoiding groove (3121). One end of the first plug rod (313) passes through the first upper die seat (311) and performs an extending / retracting movement relative to the first upper die seat (311), and the other end of the first plug rod (313) is fixedly connected to the first molding die (32). When the first molding die (32) and the first molding die core (34) are pressed together, the first mouth clamping die (312) abuts against the lower molding demoulding component (33); The upper forming and expanding assembly (41) comprises a second upper die seat (411), a second mouth clamping die (412) and a second plug rod (413). The second upper die seat (411) is fixedly connected to one end of the second mouth clamping die (412); the inner wall of the other end of the second mouth clamping die (412) is provided with a diameter expansion groove (4121). One end of the second plug rod (413) passes through the second upper die seat (411) and performs an extending / retracting movement relative to the second upper die seat (411), and the other end of the second plug rod (413) is fixedly connected to the second molding die (42); When the second molding die (42) and the second molding die core (44) are pressed together, the diameter expansion groove (4121) abuts against the lower molding diameter expansion component (43); An air slide (3111a) is provided in the first upper die seat (311). The first plug rod (313) comprises a rod body (3131) and a plug rod (3132); one end of the rod body (3131) is fixedly connected to the first molding die (32); the other end of the rod body (3131) is fixedly connected to the plug rod (3132); the plug rod (3132) slides in the air slide (3111a); The structure of the second upper die seat (411) is the same as that of the first upper die seat (311), and the structure of the second plug rod (413) is the same as that of the first plug rod (313); The lower molding demoulding assembly (33) comprises a first lower mold base (331), a first piston cylinder (332), a first piston rod (333) and a first demoulding module (334). One end of the first lower die base (331) is fixedly connected to the first piston cylinder (332), and the other end of the first lower die base (331) is fixedly connected to the first molding die core (34). One end of the first piston rod (333) is connected to the first piston cylinder (332) and performs an extension / retraction movement, and the other end of the first piston rod (333) passes through the first lower die base (331) and is fixedly connected to the first stripping die block (334); When the first molding die (32) and the first molding die core (34) are pressed together, the first stripping die (334) abuts against the first mouth clamping die (312). When the first forming die (32) and the first forming die core (34) are separated, the first piston rod (333) drives the first stripping die (334) to lift up the punched object; The lower forming and expanding assembly (43) comprises a second lower die base (431), a second piston cylinder (432), a second piston rod (433) and a second stripping die block (434). One end of the second lower die base (431) is fixedly connected to the second piston cylinder (432), and the other end of the second lower die base (431) is fixedly connected to the lower diameter expansion die (45). One end of the second piston rod (433) is connected to the second piston cylinder (432) and performs an extension / retraction movement, and the other end of the second piston rod (433) passes through the second lower die base (431) and is fixedly connected to the second stripping die block (434); When the second molding die (42) and the second molding die core (44) are pressed together, the second stripping die (434) abuts against the second mouth clamping die (412), and the diameter expansion groove (4121) abuts against the lower diameter expansion die (45). When the second forming die (42) and the second forming die core (44) are separated, the second piston rod (433) drives the second stripping die (434) to lift up the punched object; The first piston rod (333) comprises a connecting rod (3331) and a piston block (3332); the piston block (3332) is fixedly connected to one end of the connecting rod (3331); the piston block (3332) slides in the first piston cylinder (332); the other end of the connecting rod (3331) passes through the first lower die base (331) and is fixedly connected to the first stripping die block (334); The second piston rod (433) has the same structure as the first piston rod (333); The first lower mold base (331) comprises a first connecting base (3311), a first fixing base (3312) and a first outer cover (3313). One end of the first connecting seat (3311) is fixedly connected to the first piston cylinder (332), and the other end of the first connecting seat (3311) is fixedly connected to the first fixing seat (3312) and the first outer cover (3313) respectively; the first outer cover (3313) is sleeved on the outside of the first fixing seat (3312); the first fixing seat (3312) is fixedly connected to the first molding core (34); and the first stripping module (334) is located between the first outer cover (3313) and the first fixing seat (3312); The second lower mold base (431) comprises a second connecting base (4311) and a second outer cover (4312). One end of the second connecting seat (4311) is fixedly connected to the second piston cylinder (432), and the other end of the second connecting seat (4311) is fixedly connected to the second outer cover (4312). The second outer cover (4312) is sleeved on the outside of the lower diameter expansion die (45), and the second stripping module (434) is located between the second outer cover (4312) and the lower diameter expansion die (45).

2. A metal can stamping die with an elastic bottom as claimed in claim 1, characterized in that: The first upper die seat (311) comprises a die handle (3111) and an upper connecting seat (3112) fixedly connected to the die handle (3111). An air slide (3111a) is provided in the mold handle (3111). The upper connecting seat (3112) is provided with a central through slot (3112a) and a positioning slot (3112b); the mold handle (3111) passes through the central through slot (3112a) and is fixedly connected to the upper connecting seat (3112); the rod body (3131) passes through the central through slot (3112a); the inner diameter of the central through slot (3112a) is smaller than the outer diameter of the plug (3132); and the positioning slot (3112b) is connected to the first mouth clamp (312).

3. A metal can stamping die with an elastic bottom as claimed in claim 2, characterized in that: The first upper die seat (311) further comprises a connecting block (3113), wherein the connecting block (3113) is fixedly connected to the upper connecting seat (3112) to form a fixed cavity (3113a). The outer wall of the mold handle (3111) is provided with a convex edge, the mold handle (3111) passes through the upper connecting seat (3112), and the convex edge is located in the fixed cavity (3113a).

4. A metal can stamping die with an elastic bottom as claimed in claim 1, characterized in that: The first stripping module (334) is in a "convex" shape. A convex edge (3313a) is provided at one end of the first outer cover (3313) away from the first connecting seat (3311), and the convex edge (3313a) is in contact with the first stripping module (334); The second stripping module (434) has the same structure as the first stripping module (334), and the second outer cover (4312) has the same structure as the first outer cover (3313).

5. A stamping die for a metal can with an elastic bottom as claimed in claim 1, characterized in that: The second connecting seat (4311) is provided with a limiting groove (4311a), and the second outer cover (4312) is located in the limiting groove (4311a).

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