CN110576116B - Forming process of rotary opening cover of beer can - Google Patents
Forming process of rotary opening cover of beer can Download PDFInfo
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- CN110576116B CN110576116B CN201910865884.XA CN201910865884A CN110576116B CN 110576116 B CN110576116 B CN 110576116B CN 201910865884 A CN201910865884 A CN 201910865884A CN 110576116 B CN110576116 B CN 110576116B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/001—Shaping combined with punching, e.g. stamping and perforating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/44—Making closures, e.g. caps
- B21D51/48—Making crown caps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention aims to provide a beer can screw cap forming process, which adopts film-coated metal as a raw material and obtains a production process suitable for preparing a beer can screw cap by taking the film-coated metal as the raw material through a large number of tests according to the characteristics of the material. The technical scheme of the forming process of the rotary opening cover of the beer can comprises the following steps: the method comprises the following steps: stretching the cut blank into a beer can screw cap blank; step two: stretching the beer can screw cap blank for multiple times to obtain a semi-finished product; step three: trimming and punching the semi-finished product; step four: pre-rolling the outline of the sideline at the bottom of the semi-finished product and the circumferential edge of the punched hole; step five: rolling the outline of the sideline at the bottom of the semi-finished product and the circumferential edge of the punched hole; step six: flattening the roll, and tapping the surface to obtain the rotary opening cover of the beer can.
Description
Technical Field
The invention belongs to the technical field of can cover processing, and particularly relates to a beer can screw cap forming process.
Background
At present, compared with containers made of other materials, the metal container has stronger temperature and pressure bearing performance and is convenient to transport, so that the metal container has wide prospect in the field of beverage, beer and food packaging.
But metal containers are susceptible to corrosion, thereby affecting food safety. With the rapid development of the chemical industry, the coating becomes a new method for protecting the metal container from external corrosion, and a large amount of epoxy phenolic aldehyde, epoxy amino, porcelain-like coating, aluminum paste coating, water-based coating and other coatings are used on the metal container, so that the risk of transferring chemical substances into food is brought while the metal corrosion is avoided.
Disclosure of Invention
The invention aims to provide a beer can screw cap forming process, which adopts film-coated metal as a raw material and obtains a production process suitable for preparing a beer can screw cap by taking the film-coated metal as the raw material through a large number of tests according to the characteristics of the material.
The technical scheme of the forming process of the rotary opening cover of the beer can comprises the following steps:
the method comprises the following steps: punching and stretching the sheared blank into a beer can screw cap blank; the equipment structure in the first step comprises a first upper template, a first upper shearing die, a first lower edge pressing die, a first lower forming die, a first lower template, a first lower ejector rod, a first lower edge pressing force top plate, a first lower edge pressing force air cushion cylinder, a first upper stripper plate and a first upper knockout rod; the first upper shearing die is fixedly arranged below the first upper template; the first lower shearing die and the first lower forming die are fixed on the upper side of the first lower die plate, the first lower edge pressing die is connected with one end of a first lower ejector rod penetrating through the first lower die plate, the other end of the first lower ejector rod is connected with a first lower edge pressing force top plate, the first lower edge pressing force top plate is also connected with a first lower edge pressing force air cushion cylinder, and the first lower edge pressing force top plate and the first lower edge pressing force air cushion cylinder are positioned on the lower side of the first lower die plate;
step two: stretching the beer can screw cap blank for multiple times to obtain a semi-finished product; the semi-finished product obtained in the step two is provided with an annular boss, a columnar boss, a conical wall body and an annular edge which surrounds the conical wall body and extends outwards, an annular groove is formed between the annular edge and the conical wall body, and the equipment structure in the step two comprises a primary stretching die which comprises a second upper template, a second upper stripping rod, a second upper forming die, a second lower edge pressing die, a second lower material pressing support, a second lower stripping die, a second lower template, a second lower ejector rod, a second lower stripping top plate and a second lower stripping air cushion cylinder; the second upper stripping rod is slidably mounted in a second upper forming die, the second upper forming die is fixed on a second upper template, a second lower pressing side die is arranged on the upper side of a second lower pressing support, the lower side of the second lower pressing support is connected with the upper side of a second lower template, the second lower pressing side die and the second lower pressing support surround a second lower forming die, the second lower forming die is fixed on a second lower template, the second lower stripping die is positioned on the outer side of the second lower pressing side die and the second lower pressing support, the second lower stripping die is connected with one end of a second lower ejector rod penetrating through the second lower template, the other end of the second lower ejector rod penetrating through the second lower template is also connected with a second lower stripping top plate, and the second lower stripping top plate is connected with a second lower stripping air cushion cylinder;
step three: trimming and punching the semi-finished product; the equipment structure in the third step comprises a fifth upper template, a fifth upper stripping rod, a fifth upper shearing die, a fifth upper pressing support, a fifth upper pressing die, a fifth lower inner forming die, a fifth lower outer forming die, a fifth lower stripping die, a fifth lower shearing die, a fifth lower template, a fifth lower ejector rod, a fifth lower stripping top plate and a fifth lower stripping air cushion cylinder; a fifth upper pressing die is movably arranged on a fifth upper template up and down through a fifth upper pressing support, a fifth lower outer forming die and a fifth lower inner forming die are arranged on a fifth lower template, a fifth lower shearing die surrounds the fifth lower outer forming die, a gap for accommodating the fifth lower stripping die is formed between the fifth lower outer forming die and the fifth lower inner forming die, the fifth lower stripping die is connected with a fifth lower ejector rod, the fifth lower ejector rod penetrates through the fifth lower template to be connected with a fifth lower stripping plate, and the fifth lower stripping plate is connected with a fifth lower stripping air cushion cylinder;
step four: pre-rolling the outline of the sideline at the bottom of the semi-finished product and the circumferential edge of the punched hole; the equipment structure in the fourth step comprises a seventh upper template, a seventh upper stripping rod, a seventh pre-rolling round die, a seventh side line outline pre-rolling round die, a seventh upper material pressing die, a seventh lower inner forming die, a seventh lower outer forming die, a seventh lower stripping die, a seventh side line outline rolling round supporting die, a seventh lower template, a seventh lower ejector rod, a seventh lower stripping top plate and a seventh lower stripping air cushion cylinder; the seventh upper swaging die is movably arranged on the seventh upper template through an elastic structure, the seventh side line profile pre-rolling die is positioned at the outer side of the seventh upper swaging die, the seventh upper stripper rod and the seventh pre-rolling die are positioned at the inner side of the seventh upper swaging die, the seventh lower outer forming die and the seventh lower inner forming die are arranged on the seventh lower template, the seventh side line profile rolling support die surrounds the seventh lower outer forming die and corresponds to the seventh upper swaging die in position, and the seventh lower stripper die is positioned in a gap between the seventh side line profile rolling support die and the seventh lower outer forming die;
step five: rolling the outline of the sideline at the bottom of the semi-finished product and the circumferential edge of the punched hole; the equipment structure in the fifth step comprises an eighth upper template, an eighth upper stripping rod, an eighth rolling die, an eighth upper pressing die, an eighth lower positioning core die, an eighth lower stripping die, an eighth lower positioning core die holder, an eighth lower template, an eighth lower ejector rod, an eighth lower stripping top plate and an eighth lower stripping air cushion cylinder; the eighth upper pressing die is arranged on the eighth upper die plate, the eighth upper stripper rod and the eighth rounding die are positioned on the inner side of the eighth upper pressing die, the eighth lower stripper die is connected with the eighth lower ejector rod, the eighth lower ejector rod passes through the eighth lower die plate to be connected with the eighth lower stripper top plate, the eighth lower stripper top plate is connected with the eighth lower stripper air cylinder, the eighth lower positioning core die holder is arranged on the eighth lower die plate, and the eighth lower positioning core die is arranged on the eighth lower positioning core die holder;
step six: flattening the roll, and tapping the surface to obtain a rotary opening cover of the beer can; the device structure in the sixth step comprises a tenth upper die holder, a tenth upper servo motor, a tenth upper die holder I, a tenth reset spring, a tenth backup plate, a tenth upper dental model, a tenth lower dental model, a tenth supporting plate, a tenth backup wheel, a tenth lower die holder and a tenth lower servo motor; the tenth upper die holder is connected with a tenth upper servo motor, a tenth upper die holder I, a tenth return spring, a tenth backup plate and a tenth upper die; the tenth lower dental model, the tenth supporting plate, the tenth idler wheel, the tenth lower die holder and the tenth lower servo motor are connected.
Preferably, in the fourth step, the sideline contour of the bottom of the semi-finished product is pre-rounded to be bent to be vertical.
Preferably, the method further comprises the following steps between the fifth step and the sixth step: and (4) rounding the edge line of the bottom of the semi-finished product.
Preferably, in step three, the excess material edges on the ring edges of the semifinished product are cut off.
Preferably, in the third step, the top surface of the annular boss of the semi-finished product on the upper side is punched, and the through hole is formed in the vertical direction.
Preferably, in step five, the circumferential edge of the punched hole is rounded more than once.
The production process of the invention adopts the film-coated metal as the raw material, compared with the traditional coating, the production process has the advantages of environmental protection, more reliable performance, lower cost, simple, compact and environmental protection, and reduces the steps of coating, drying, cleaning process, waste gas emission and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a structural view of a beer can screw cap billet obtained in step one of the process for forming a beer can screw cap of the present invention;
FIG. 2(a) (b) (c) is a structural view obtained by drawing each time in step two of the process for forming a screw cap of a beer can according to the present invention;
FIG. 3(a) (b) is a structural diagram obtained by trimming and punching a semi-finished product in the third step of the beer can screw cap forming process of the present invention;
FIG. 4 is a structural diagram obtained in step four of the process for forming a screw cap of a beer can according to the present invention;
FIG. 5(a) (b) is a structural diagram obtained in step five of the process for forming a screw cap of a beer can according to the present invention;
FIG. 6 is a structural view of a beer can screw cap obtained in step six of the process for forming a beer can screw cap of the present invention;
FIG. 7 is a flow chart of a process for forming a screw cap of a beer can according to the present invention;
FIGS. 8 to 17 are structural views of an apparatus used in a process of forming a screw cap for a beer can according to the present invention.
Detailed Description
The invention aims to provide a beer can screw cap forming process, which adopts film-coated metal as a raw material and obtains a production process suitable for preparing a beer can screw cap by taking the film-coated metal as the raw material through a large number of tests according to the characteristics of the material.
The invention relates to a beer can screw cap forming process, which comprises the following steps:
step one 101: punching and stretching the sheared blank into a beer can screw cap blank;
in step one 101, an upper shearing die and a lower shearing die are matched with each other to shear the material to a size required by the blank, and then the sheared blank is punched and stretched into a beer can spiral cover blank through an upper forming die and a lower forming die of a basic cover punching machine.
The shape of the beer can screw cap blank obtained by stretching is a hollow shallow disc with one open end.
The material for manufacturing the beer tank rotary opening cover can be metal film-coated plates, such as iron film-coated plates, aluminum film-coated plates or composite metal film-coated plates, and the thickness of the metal film-coated plates must be uniform.
Step two 102: stretching the beer can screw cap blank for multiple times to obtain a semi-finished product;
and step two 102, stretching the beer can screw cap blank for more than one time by the boss stretching die to meet the preset size, and obtaining a semi-finished product.
Step three 103: trimming and punching the semi-finished product;
in the third step 103, the trimming and punching die is used for cutting off redundant rim charge and punching, so that the outer ring of the product can be cut off while punching the semi-finished product, the punching efficiency is improved, and the production process is simplified.
Step four 104: pre-rolling the outline of the sideline at the bottom of the semi-finished product and the circumferential edge of the punched hole;
in step four 104, the edge line profile of the bottom of the semi-finished product and the circumferential edge of the punched hole are pre-rounded through the rounding die, that is, the edge line profile of the bottom of the semi-finished product is bent to be vertical, a downward bent part is formed, and the circumferential edge of the punched hole, namely the pre-rounded part, is folded into an arc line.
Step five 105: rolling the outline of the sideline at the bottom of the semi-finished product and the circumferential edge of the punched hole;
in step five 105, the pre-rolling circle punched in step four 104 is rolled, i.e. the circumferential edge is turned inwards. If the rolling is carried out for multiple times, a circle layer is added, three layers are formed, and a circle layer is added, four layers are formed.
After the fifth step and before the sixth step 106, the following steps may also be included: and (4) rounding the outline of the bottom of the semi-finished product.
Step six 106: flattening the roll, and tapping the surface to obtain the rotary opening cover of the beer can.
In step six 106, the rolling circle in the step is flattened through a die, and the surface is tapped to form threads, so that the beer can screw cap is obtained.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The material for manufacturing the beer tank rotary opening cover can be metal film-coated plates, such as iron film-coated plates, aluminum film-coated plates or composite metal film-coated plates, and the thickness of the metal film-coated plates must be uniform. For convenience of explanation, the embodiments of the present invention are collectively exemplified by a coated iron sheet.
The first to sixth steps mentioned below all use a punch press as power, and each process is completed by utilizing the reciprocating motion of the punch press, and the main difference lies in the die structure and the forming process of each step. Step one, using a first punch; the second punch is used in the steps two to five, the third punch is used in the step six, and the embodiment is only a part of the embodiment of the invention, but not the whole embodiment.
The invention relates to a beer can screw cap forming process, which comprises the following steps:
the method comprises the following steps: stretching the cut blank into a beer can screw cap blank;
in the first step, the upper shearing die and the lower shearing die are matched with each other to shear the film-coated patch into a blank with a required size, and then the sheared blank is stretched into a beer can screw cap blank, namely a can cap 1, which is a hollow shallow disc with an opening at one end.
As shown in fig. 8, the first press used in the first step includes a first upper die plate 101, a first upper notching die 102, a first lower notching die 103, a first lower edge-pressing die 104, a first lower forming die 105, a first lower die plate 106, a first lower ejector rod 107, a first lower edge-pressing force top plate 108, a first lower edge-pressing force air cushion cylinder 109, a first upper stripper plate 110, and a first upper knockout rod 111.
The first lower shear die 103 and the first lower forming die 105 are both fixed on the upper side of the first lower die plate 106, the first lower shear die 103 is located on the outer side of the first lower forming die 105, the first lower shear die and the first lower forming die are arranged at intervals, and a containing groove for containing the first lower edge pressing die 104 is formed in a gap between the first lower shear die 103 and the first lower forming die.
The first lower edge pressing die 104 moves up and down in the vertical direction in the accommodating groove, in order to realize the up-and-down movement of the first lower edge pressing die 104, the first lower edge pressing die 104 is connected with one end of a first lower ejection rod 107 penetrating through the first lower die plate 106, the other end of the first lower ejection rod 107 extending out of the first lower die plate 106 is connected with a first lower edge pressing force top plate 108, and the first lower edge pressing force top plate 108 is further connected with a first lower edge pressing force air cushion cylinder 109.
A first lower blank force top plate 108 and a first lower blank force air cushion cylinder 109 are located on the underside of the first lower die plate 106.
The first upper notching die 102 is fixedly installed below the first upper die plate 101, and the lower end surface of the first upper notching die 102 corresponds to the upper end surface of the first lower edge pressing die 104 in the vertical direction.
The first upper stripper plate 110 separates the materials except the cut wafers from the mold for subsequent production, and the first upper knockout pin 111 separates the can cover 1 from the mold, blows the materials away, and is sent to the next process by the first can conveying system.
The first upper die plate 101 is connected to a first punch press slide block, when the first punch press slide block drives the first upper die plate 101 to press downwards, the first upper notching die 102 is driven to punch downwards, the film-coated iron sheet is firstly punched by the first upper notching die 102 and the first lower notching die 103 in a matched manner to form a wafer, then the wafer is clamped by the first upper notching die 102 and the first lower edge-pressing die 104 and is stretched downwards, at the moment, the first lower edge-pressing die 104 is propped against by the air pressure reaction force of the first lower edge-pressing force air cushion cylinder 109 below, the first lower ejector rod 107 and the first lower edge-pressing force top plate 18 generate proper edge-pressing force to the wafer, so that the wafer cannot generate the bad phenomena of wrinkling, scratching, pulling-off and the like in the process of stretching to form the can lid 1, meanwhile, the first lower forming die 105 and the first lower die plate 16 are in a static state, and the film-coated iron sheet is under the acting force of clamping and stretching downwards by the first upper notching die 102 and the first, the coated iron sheet is molded by flow-molding against the side wall of the first lower molding die 105, and finally reaches the die-closing height, thereby obtaining the can lid 1.
After the tank cover 1 is formed, the first punch press slide block is lifted back, the first lower blank pressing die 104, the first lower ejector rod 107, the first lower blank pressing force top plate 108 and the first lower blank pressing force air cushion cylinder 109 return rapidly at the same time, the tank cover 1 is ejected out of the first lower forming die 105, finally, the tank cover 1 is separated from the first lower forming die 105 along with the first upper shearing die 102, and after the tank cover 1 reaches the die opening height, the tank cover 1 is separated from the first upper material-beating rod 111 and blown away, and is sent to the next process by the first tank conveying system.
Step two: stretching the beer can screw cap blank for more than one time to obtain a semi-finished product;
and in the second step, the beer can screw cap blank is stretched for more than one time through a boss stretching die to obtain a semi-finished product. In the process, a constant-thickness stretching process is adopted, the stretching times and the stretching diameters (from large to small) of the steps are determined according to the stretching coefficient, the ductility of the material and the like, the stretching heights of the steps are calculated, and finally the obtained semi-finished product meets the preset slender ratio.
As shown in fig. 9, 10 and 11, the can lid 1 obtained in the first step is stretched three times in sequence to obtain a can lid 2, a can lid 3 and a can lid 4 in this order, and the can lid 4 is a semi-finished product. The semi-finished product piece is provided with an annular boss, a columnar boss, a conical wall body and an annular edge which surrounds the conical wall body and extends outwards, an annular groove is formed between the annular edge and the conical wall body, the diameter of the annular boss is smaller than that of the columnar boss, and the diameter of the upper edge of the conical wall body, namely one side close to the columnar boss, is smaller than that of the lower edge of the conical wall body, namely one side close to the annular edge.
As shown in the figure of the second punch press used in the second step, the primary drawing die includes a second upper die plate 201, a second upper stripper bar 202, a second upper forming die 203, a second lower forming die 204, a second lower trimming die 205, a second lower stripper support 206, a second lower stripper die 207, a second lower die plate 208, a second lower ejector rod 209, a second lower stripper top plate 210, and a second lower stripper air cushion cylinder 211.
The second lower trimming die 205 is arranged on the upper side of the second lower pressing support 206, the lower side of the second lower pressing support 206 is connected with the upper side of the second lower template 208, the second lower pressing support 206 is of an elastic structure, and the second lower trimming die 205 can move up and down along the vertical direction.
A second lower trimming die 205 and a second lower press shoe 206 surround the second lower forming die 204, and the second lower forming die 204 is fixed to a second lower die plate 208.
The second lower stripper die 207 is located outside the second lower trimming die 205 and the second lower press support 206, and surrounds the second lower trimming die 205 and the second lower press support 206.
The second lower stripping die 207 is connected with one end of a second lower ejector pin 209 penetrating through the second lower template 208, the second lower ejector pin 209 penetrates through the other end of the first lower template 208 and is further connected with a second lower stripping top plate 210, and the second lower stripping top plate 210 is connected with a second lower stripping air cylinder 211.
The second upper forming die 203 is fixed on the second upper die plate 201, the lower end face of the second upper forming die 203 corresponds to the upper end face of the second lower trimming die 205 in the vertical direction, the corresponding end faces of the second upper forming die 203 and the second lower trimming die 205 can be both inclined planes, and the second upper stripper bar 202 is located on the inner side of the second upper forming die 203.
The second upper die plate 201 is connected to the second press ram, the second upper stripper bar 202 is slidably mounted in the second upper forming die 203, and the driving rod of the second upper stripper bar 202 extends upward through the second upper forming die 203 and the second upper die plate 201.
When the primary stretching die is in a die opening state, the primary stretching die is conveyed into the primary stretching die through a first can conveying system, a beer can spiral-opening cover blank is positioned below a second upper forming die 203, a second lower stripping die 207 supports the beer can spiral-opening cover blank, when a second punch press slide block drives a second upper die plate 201 to press downwards, the second upper forming die 203 is driven to punch downwards, the second lower stripping die 207 moves downwards until the second upper forming die 203 and a second lower side pressing die 205 tightly press the beer can spiral-opening cover blank, proper side pressing force is provided between the second upper forming die 203 and the second lower side pressing die 205, so that the beer can spiral-opening cover blank cannot generate the adverse phenomena of wrinkling, scratching, pulling and the like in the primary stretching process, then the second upper forming die 203 continues to punch downwards, the second lower forming die 204 moves upwards relatively, the beer can spiral-opening cover blank tightly clings to the outer side wall of the second lower forming die 204 and the inner side wall of the second upper forming die 203 to flow and form, finishing the action of one-time stretch forming to obtain a one-time stretch can, namely, a can cover 2, after the one-time stretch can is formed, the slide block of the second punch press is lifted back, the second lower stripping die 207, the second lower ejector rod 209, the second lower stripping top plate 210 and the second lower stripping air cushion cylinder 211 are simultaneously and quickly returned to eject the can cover 2 out of the second lower forming die 204, finally, the can cover 2 is separated from the second lower forming die 204 along with the second upper forming die 203, when the can cover reaches the top surface of the second lower forming die 204, after the die opening height is reached, the can cover 2 stays on the plane of the second stripping die 207, the second upper stripping rod 202 ejects the can cover 2 out, and the can cover 2 is conveyed away by a can conveying system to enter the next process.
The secondary stretching die comprises a third upper die plate 301, a third upper stripping rod 302, a third upper forming die 303, a third lower forming die 304, a third lower edge pressing die 305, a third lower stripping support 306, a third lower stripping die 307, a third lower die plate 308, a third lower ejector rod 309, a third lower stripping top plate 310 and a third lower stripping air cushion cylinder 311.
The secondary drawing die is basically the same in structure and operation principle as the primary drawing die, and is different in the forming size of the third lower forming die 304 and the third upper forming die 303. And the tank cover 3 is completed through the stamping action of the second punch, is conveyed away by the tank conveying system, and enters the next working procedure.
The tertiary stretching die comprises a fourth upper die plate 401, a fourth upper stripping rod 402, a fourth upper forming die 403, a fourth upper pressing material support 404, a fourth upper edge pressing die 405, a fourth lower inner forming die 406, a fourth lower outer forming die 407, a fourth lower stripping die 408, a fourth lower die plate 409, a fourth lower ejector rod 410, a fourth lower stripping top plate 411, a fourth lower stripping air cushion cylinder 412 and a fourth lower pressing die 413.
The fourth upper pressing die 405 is connected with the fourth upper die plate 401 through the fourth upper pressing support 404, the fourth upper pressing support 404 is of an elastic structure, the fourth upper pressing die 405 can move up and down in the vertical direction, and the lower end face of the fourth upper pressing die 405 corresponds to the upper end face of the fourth lower pressing die 413 in the vertical direction.
The fourth upper molding die 403 is located inside the fourth upper press die 405 and the fourth upper press support 404, and the fourth upper stripper bar is located inside the fourth upper molding die 403.
The fourth upper forming die 403 has a cavity corresponding to the structure of the can lid 4.
A fourth lower inner forming die 406 is fixed on a fourth lower template 409, a fourth lower outer forming die 407 surrounds the fourth lower inner forming die 406 and is movably mounted on the fourth lower template 409, a fourth lower stripper die 413 is fixed on the fourth lower template 409 and surrounds the fourth lower outer forming die 407, and a gap for accommodating the fourth lower stripper die 408 is formed between the fourth lower stripper die 413 and the fourth lower outer forming die 407.
The fourth lower stripper die 408 is connected to one end of a fourth lower ejector pin 410 passing through a fourth lower die plate 409, the fourth lower ejector pin 410 passes through the other end of the fourth lower die plate 409 and is further connected to a fourth lower stripper top plate 411, and the fourth lower stripper top plate 411 is connected to a fourth lower stripper air cylinder 412.
In the state that the third drawing die is opened, the fourth lower stripper die 408 supports the can cover 3, the second punch press slide block drives the fourth upper die plate 401 to punch downwards, the fourth lower stripper die 408 gradually moves downwards until the fourth upper stripper die 405 contacts with the fourth lower stripper die 413, the fourth upper die plate 401 continues to punch downwards, the fourth upper stripper die 405 moves upwards, the fourth lower stripper die 408 continues to move downwards, the fourth upper forming die 403 and the fourth lower outer forming die 407 compress the can cover 3 tightly, then the fourth upper die plate 401 continues to punch downwards, the fourth upper forming die 403 and the fourth lower outer forming die 407 compress the can cover 3 tightly and move downwards together, and finally the height of the closed die 403 is reached, so that the can cover 4 is obtained.
After the forming, the second punch slide block rises again, the fourth lower stripper die 408 returns quickly, and the can lid 4 is ejected out of the fourth lower outer forming die 407, and finally is sent away by the can sending system, and the next process is performed.
Step three: trimming the ring edge of the semi-finished product, and cutting off redundant rim charge;
in the third step, the excess rim charge of the ring edge of the semi-finished product is cut off through the trimming and punching die of the second punch press to obtain a smooth and tidy can edge, so that the precise processing of the outline shape of the semi-finished product is completed, and the accurate control of the shape and the size is realized.
The device structure comprises a fifth upper template 501, a fifth upper stripping rod 502, a fifth upper shearing die 503, a fifth upper pressing material support 504, a fifth upper pressing material die 505, a fifth lower inner forming die 506, a fifth lower outer forming die 507, a fifth lower stripping die 508, a fifth lower shearing die 509, a fifth lower template 510, a fifth lower ejector rod 511, a fifth lower stripping top plate 512 and a fifth lower stripping air cushion cylinder 513.
The fifth upper pressing die 505 is movably disposed on the fifth upper die plate 501 up and down through a fifth upper pressing support 504, the fifth upper pressing support 504 may be an elastic structure, the fifth upper trimming die 503 is located outside the fifth upper pressing die 505, and the fifth upper stripper rod 502 is located inside the fifth upper pressing die 505.
A fifth lower outer forming die 507 and a fifth lower inner forming die 506 are provided on a fifth lower template 510, and a fifth lower shear die 509 surrounds the fifth lower outer forming die 507 with a gap therebetween to accommodate a fifth lower stripper die 508. The lower end surface of the fifth upper nip film 505 corresponds in position in the vertical direction to the upper end surface of the fifth lower shear die 509.
The fifth lower stripper 508 is connected to a fifth lower ejector 511, the fifth lower ejector 511 passes through the fifth lower die plate 510 to be connected to a fifth lower stripper plate 512, and the fifth lower stripper plate 512 is connected to a fifth lower stripper air cylinder 513.
During trimming, the fifth lower stripper die 508 supports the can lid 4, the second punch press slide block drives the fifth upper die plate 501 to punch downwards, the fifth lower stripper bar 508 moves downwards until the fifth upper swage die 505 contacts with the fifth lower trimming die 509, the can lid 4 is fixed on the fifth lower outer forming die 507 and the fifth lower inner forming die 506 to continue to punch downwards, the fifth upper swage die 505 moves upwards due to extrusion of the fifth lower trimming die 509, and finally the fifth upper trimming die 503 punches downwards to punch and trim waste materials.
The tank cover 5 is completed through the stamping action of the second punch, is conveyed away by the tank conveying system, enters the next process, and punches the annular boss on the upper side of the tank cover 5 to form a through hole in the vertical direction;
after trimming, punching the top surface of the annular boss of the semi-finished product on the upper side through a trimming and punching die, and forming a through hole in the vertical direction.
As shown in the figure, the trimming and punching die of the second punch includes a sixth upper die plate 601, a sixth upper stripper 602, a sixth upper punch die 604, a sixth upper punch die 605, a sixth lower shear die 606, a sixth lower stripper die 607, a sixth lower shear die holder 608, a sixth lower die plate 609, a sixth lower ejector 610, a sixth lower stripper top plate 611, and a sixth lower stripper air cushion cylinder 612.
The sixth upper pressing die 605 is fixed on the sixth upper die plate 601, the sixth upper pressing die 605 surrounds the sixth upper stripper rod 602 and the sixth upper punch die 604, the sixth lower stripper die 607 is located outside the sixth lower shear die 606, and details of the lower stripper die are not described.
The trimmed semi-finished product is placed on a sixth lower stripper 607, the second punch press slide block drives a sixth upper die plate 601 to punch downwards, the sixth lower stripper 607 moves downwards, a sixth upper pressing die 605 and a sixth lower shearing die 606 press the can cover 5 tightly, and a sixth upper punch die 604 moves downwards to punch. After the punching is completed, the sixth lower stripper 607 is quickly lifted back,
and (5) obtaining the tank cover 6 through the stamping action of the second punch, conveying the tank cover by the tank conveying system, and entering the next process.
Step four: pre-rolling the outline of the sideline at the bottom of the semi-finished product and the circumferential edge of the punched hole;
in step four, the edge contour of the bottom of the semifinished product is bent to a vertical position, the circumferential edge of the punched hole is bent to a curvature, and the edge is not in contact with the can wall.
The structure of the second punch press in the fourth step includes a seventh upper template 701, a seventh upper stripper bar 702, a seventh pre-rolling die 703, a seventh side-line-profile pre-rolling die 704, a seventh upper pressing die 705, a seventh lower inner forming die 706, a seventh lower outer forming die 707, a seventh lower stripping die 708, a seventh side-line-profile rolling support die 709, a seventh lower template 710, a seventh lower ejector rod 711, a seventh lower stripping top plate 712, and a seventh lower stripping air cushion cylinder 713.
The seventh upper pressing mold 705 is movably disposed on the seventh upper mold plate 701 through an elastic structure, and can move up and down. The seventh edge outline pre-rolling die 704 is located outside the seventh upper swaging die 705, and the seventh upper stripper rod 702 and the seventh pre-rolling die 703 are located inside the seventh upper swaging die 705.
A seventh lower outer forming die 707 and a seventh lower inner forming die 706 are disposed on the seventh lower template 710, a seventh side line profile rolling support die 709 surrounds the seventh lower outer forming die and corresponds to the seventh upper swaging die 705 in position, and a seventh lower stripper die 708 is disposed in a gap between the seventh side line profile rolling support die 709 and the seventh lower outer forming die 707.
The second punch press slide block drives the seventh upper template 701 to move downwards, the seventh lower stripper die 708 supports the punched semi-finished product and moves downwards until the seventh upper swage die 705 contacts with the seventh edge contour circle rolling support die 709, the tank cover is fixed on the seventh lower outer forming die 707 and the seventh lower inner forming die 706, downward punching is continued, the seventh upper swage die 705 and the seventh edge contour circle rolling support die 709 compress the blank pressing, the seventh edge contour circle pre-rolling die 704 is positioned at the outer side of the seventh edge contour circle rolling support die 709 and presses the blank pressing downwards to perform circle pre-rolling. Meanwhile, the seventh pre-rounding die 703 extends into the through hole and presses the edge to the outside to perform pre-rounding. And (5) obtaining the tank cover 7 through the stamping action of the second punch, conveying the tank cover by the tank conveying system, and entering the next process.
Step five: carrying out more than one edge rolling molding on the edge line outline of the bottom of the semi-finished product and the circumferential edge of the punched hole;
and step five, performing more than one rolling molding on the circumferential edge of the punched hole through a rolling mold.
As shown in the figure, the apparatus structure in the fifth step includes an eighth upper mold plate 801, an eighth upper stripper bar 802, an eighth rounding mold 803, an eighth upper pressing mold 804, an eighth lower positioning core mold 805, an eighth lower stripper mold 806, an eighth lower positioning core mold seat 807, an eighth lower mold plate 808, an eighth lower ejector pin 809, an eighth lower stripper top plate 810, and an eighth lower stripper air cushion cylinder 811. And the tank cover 8 is completed through the stamping action of the second punch, is conveyed away by the tank conveying system, and enters the next working procedure.
The device structure in the fifth step comprises a ninth upper template 901, a ninth upper stripper rod 902, a ninth upper positioning core mold 903, a ninth upper pressing mold 904, a ninth lower positioning core mold 905, a ninth lower stripper mold 906, a ninth lower positioning core mold base 907, a ninth edge profile rounding mold 908, a ninth lower template 909, a ninth lower ejector rod 910, a ninth lower stripper top plate 911 and a ninth lower stripper air cylinder 912. The tank cover 9 is completed through the punching action of the second punch, is conveyed away by the tank conveying system, and enters the next process.
The edge lines at the bottom of the semifinished part can also be rounded after the rounding.
Step six: and flattening the rolled circle in the step, tapping the surface to form threads, and obtaining the can cover 9.
And step six, flattening the rolling circle in the step through a die, tapping the surface to form a thread, and connecting the middle part through the tangent lines of two circular arcs.
The corresponding device structure in the sixth step includes a tenth upper die holder 1001, a tenth upper servo motor 1002, a tenth upper die holder one 1003, a tenth return spring 1004, a tenth backup plate 1005, a tenth upper dental model 1006, a tenth lower dental model 1007, a tenth supporting plate 1008, a tenth backup wheel 1009, a tenth lower die holder 1010 and a tenth lower servo motor 1011.
The tenth upper die holder 1001 is coupled with a tenth upper servo motor 1002, a tenth upper die holder one 1003, a tenth return spring 1004, a tenth backup plate 1005 and a tenth upper die 1006; the tenth upper die holder 1003 and the tenth upper die holder 1001 are coupled in a relatively fixed manner, and the tenth upper die holder 1003 can move laterally through the outside; the tenth lower dental model 1007, the tenth supporting plate 1008, the tenth idler wheel 1009, the tenth lower die holder 1010 and the tenth lower servo motor 1011 are connected together, and the tenth lower dental model 1007 and the tenth lower die holder 1010 are connected in a relatively fixed manner and can move radially through the outside; tenth upper servo motor 1002 and tenth lower servo motor 1011 rotate synchronously at the same speed. The tenth upper dental cast 1006 and the tenth lower dental cast 1007 are installed correspondingly.
Tenth cope match-plate pattern 1001 is connected to the third punch press slider, and when the tenth cope match-plate pattern 101 was pushed down to third punch press slider drive, drive tenth upper die 1006 and punch downwards, hit tenth depended wheel 1009 as tenth depended plate 1005, and ten upper die 1006 and ten lower die 1007 are synchronous rotatory with fast simultaneously, accomplish and carry out the edge rolling with cover 9 and flatten, attack the tooth to the surface, form the screw action. Finally, the can lid 10 ((beer can screw cap)) is ejected following the tenth pallet 1008 to reach the mold opening height, and the can lid 10 is sent to the next process by the can feeding system.
The tank mouth is formed by adopting a thread seal, and the thread seal is connected with a screw mouth or a screw mouth component in a thread sealing way by using a cover or a cover component with threads.
The production process of the invention adopts the film-coated metal as the raw material, compared with the traditional coating, the production process has the advantages of environmental protection, more reliable performance, lower cost, simple, compact and environmental protection, and reduces the steps of coating, drying, cleaning process, waste gas emission and the like.
The pressure-bearing requirement of the finished product of the process of the invention is required to reach 0.64MPa after the finished product is combined with a can body and a can cover (the pressure is tested by compressed air and kept for more than 5 seconds when the pressure reaches 0.64MPa, and the phenomena of obvious deformation, explosion or leakage and the like of a bottom rib are not generated).
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a beer jar spiral cover forming process which characterized in that includes:
the method comprises the following steps: punching and stretching the sheared blank into a beer can screw cap blank; the equipment structure in the first step comprises a first upper template, a first upper shearing die, a first lower edge pressing die, a first lower forming die, a first lower template, a first lower ejector rod, a first lower edge pressing force top plate, a first lower edge pressing force air cushion cylinder, a first upper stripper plate and a first upper knockout rod; the first upper shearing die is fixedly arranged below the first upper template; the first lower shearing die and the first lower forming die are fixed on the upper side of the first lower die plate, the first lower edge pressing die is connected with one end of a first lower ejector rod penetrating through the first lower die plate, the other end of the first lower ejector rod is connected with a first lower edge pressing force top plate, the first lower edge pressing force top plate is also connected with a first lower edge pressing force air cushion cylinder, and the first lower edge pressing force top plate and the first lower edge pressing force air cushion cylinder are positioned on the lower side of the first lower die plate;
step two: stretching the beer can screw cap blank for multiple times to obtain a semi-finished product; the semi-finished product obtained in the step two is provided with an annular boss, a columnar boss, a conical wall body and an annular edge which surrounds the conical wall body and extends outwards, an annular groove is formed between the annular edge and the conical wall body, and the equipment structure in the step two comprises a primary stretching die which comprises a second upper template, a second upper stripping rod, a second upper forming die, a second lower edge pressing die, a second lower material pressing support, a second lower stripping die, a second lower template, a second lower ejector rod, a second lower stripping top plate and a second lower stripping air cushion cylinder; the second upper stripping rod is slidably mounted in a second upper forming die, the second upper forming die is fixed on a second upper template, a second lower pressing side die is arranged on the upper side of a second lower pressing support, the lower side of the second lower pressing support is connected with the upper side of a second lower template, the second lower pressing side die and the second lower pressing support surround a second lower forming die, the second lower forming die is fixed on a second lower template, the second lower stripping die is positioned on the outer side of the second lower pressing side die and the second lower pressing support, the second lower stripping die is connected with one end of a second lower ejector rod penetrating through the second lower template, the other end of the second lower ejector rod penetrating through the second lower template is also connected with a second lower stripping top plate, and the second lower stripping top plate is connected with a second lower stripping air cushion cylinder;
step three: trimming and punching the semi-finished product; the equipment structure in the third step comprises a fifth upper template, a fifth upper stripping rod, a fifth upper shearing die, a fifth upper pressing support, a fifth upper pressing die, a fifth lower inner forming die, a fifth lower outer forming die, a fifth lower stripping die, a fifth lower shearing die, a fifth lower template, a fifth lower ejector rod, a fifth lower stripping top plate and a fifth lower stripping air cushion cylinder; a fifth upper pressing die is movably arranged on a fifth upper template up and down through a fifth upper pressing support, a fifth lower outer forming die and a fifth lower inner forming die are arranged on a fifth lower template, a fifth lower shearing die surrounds the fifth lower outer forming die, a gap for accommodating the fifth lower stripping die is formed between the fifth lower outer forming die and the fifth lower inner forming die, the fifth lower stripping die is connected with a fifth lower ejector rod, the fifth lower ejector rod penetrates through the fifth lower template to be connected with a fifth lower stripping plate, and the fifth lower stripping plate is connected with a fifth lower stripping air cushion cylinder;
step four: pre-rolling the outline of the sideline at the bottom of the semi-finished product and the circumferential edge of the punched hole; the equipment structure in the fourth step comprises a seventh upper template, a seventh upper stripping rod, a seventh pre-rolling round die, a seventh side line outline pre-rolling round die, a seventh upper material pressing die, a seventh lower inner forming die, a seventh lower outer forming die, a seventh lower stripping die, a seventh side line outline rolling round supporting die, a seventh lower template, a seventh lower ejector rod, a seventh lower stripping top plate and a seventh lower stripping air cushion cylinder; the seventh upper swaging die is movably arranged on the seventh upper template through an elastic structure, the seventh side line profile pre-rolling die is positioned at the outer side of the seventh upper swaging die, the seventh upper stripper rod and the seventh pre-rolling die are positioned at the inner side of the seventh upper swaging die, the seventh lower outer forming die and the seventh lower inner forming die are arranged on the seventh lower template, the seventh side line profile rolling support die surrounds the seventh lower outer forming die and corresponds to the seventh upper swaging die in position, and the seventh lower stripper die is positioned in a gap between the seventh side line profile rolling support die and the seventh lower outer forming die;
step five: rolling the outline of the sideline at the bottom of the semi-finished product and the circumferential edge of the punched hole; the equipment structure in the fifth step comprises an eighth upper template, an eighth upper stripping rod, an eighth rolling die, an eighth upper pressing die, an eighth lower positioning core die, an eighth lower stripping die, an eighth lower positioning core die holder, an eighth lower template, an eighth lower ejector rod, an eighth lower stripping top plate and an eighth lower stripping air cushion cylinder; the eighth upper pressing die is arranged on the eighth upper die plate, the eighth upper stripper rod and the eighth rounding die are positioned on the inner side of the eighth upper pressing die, the eighth lower stripper die is connected with the eighth lower ejector rod, the eighth lower ejector rod passes through the eighth lower die plate to be connected with the eighth lower stripper top plate, the eighth lower stripper top plate is connected with the eighth lower stripper air cylinder, the eighth lower positioning core die holder is arranged on the eighth lower die plate, and the eighth lower positioning core die is arranged on the eighth lower positioning core die holder;
step six: flattening the roll, and tapping the surface to obtain a rotary opening cover of the beer can; the device structure in the sixth step comprises a tenth upper die holder, a tenth upper servo motor, a tenth upper die holder I, a tenth reset spring, a tenth backup plate, a tenth upper dental model, a tenth lower dental model, a tenth supporting plate, a tenth backup wheel, a tenth lower die holder and a tenth lower servo motor; the tenth upper die holder is connected with a tenth upper servo motor, a tenth upper die holder I, a tenth return spring, a tenth backup plate and a tenth upper die; the tenth lower dental model, the tenth supporting plate, the tenth idler wheel, the tenth lower die holder and the tenth lower servo motor are connected.
2. The process for forming a screw cap for a beer can according to claim 1, wherein the pre-rounding of the edge contour of the bottom of the semi-finished product in the fourth step is to bend the edge contour of the bottom of the semi-finished product to a vertical state.
3. The process for forming a screw cap for a beer can according to claim 2, further comprising the following steps between the fifth step and the sixth step: and (4) rounding the edge line of the bottom of the semi-finished product.
4. The process for forming a screw cap for a beer can according to claim 3, wherein the excess rim of the ring of the work in process is cut off in step three.
5. The process for forming a screw cap for a beer can according to claim 4, wherein in the third step, the top surface of the annular projection of the semi-finished product on the upper side is punched to form the through hole in the vertical direction.
6. The process of claim 1, wherein in step five, the circumferential edge of the punched hole is rounded more than once.
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| CN112340214A (en) * | 2020-11-16 | 2021-02-09 | 奥瑞金科技股份有限公司 | Metal rotary opening cover, pop can and manufacturing method of metal rotary opening cover |
| CN113770244A (en) * | 2021-09-18 | 2021-12-10 | 二重（德阳）重型装备有限公司 | Manufacturing method of upper end enclosure of high-level radioactive waste liquid glass curing container |
| WO2024105098A1 (en) * | 2022-11-18 | 2024-05-23 | Adval Tech Holding Ag | Method for producing an aerosol dome |
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| US5718352A (en) * | 1994-11-22 | 1998-02-17 | Aluminum Company Of America | Threaded aluminum cans and methods of manufacture |
| CN1520947A (en) * | 2003-02-07 | 2004-08-18 | 陆爱平 | Method for making the manufacturing technique of metal top cover |
| KR101851422B1 (en) * | 2011-03-28 | 2018-05-31 | 유니버설세이칸 가부시키가이샤 | Method for manufacturing threaded bottle can and threaded bottle can |
| CN102728709B (en) * | 2012-07-25 | 2015-07-08 | 四川省隆鑫科技包装有限公司 | Method for machining anti-fake aluminum cover and drawing mold |
| CN202845598U (en) * | 2012-10-17 | 2013-04-03 | 广东韩江轻工机械有限公司 | Once punch forming and wire edge die of metal can cap |
| CN108246914A (en) * | 2018-04-09 | 2018-07-06 | 无锡智高点技术研发有限公司 | A kind of manufacture craft of cover |
| CN109332522B (en) * | 2018-09-05 | 2021-07-02 | 广东韩江轻工机械有限公司 | Manufacturing process of rotary-opening tank and rotary-opening tank |
| CN109746342A (en) * | 2019-03-14 | 2019-05-14 | 苏州龙正包装科技有限公司 | Aluminium pot whorl of bottleneck processing technology |
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