CN112935125A - Method for producing metal can and metal can - Google Patents
Method for producing metal can and metal can Download PDFInfo
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- CN112935125A CN112935125A CN202110179334.XA CN202110179334A CN112935125A CN 112935125 A CN112935125 A CN 112935125A CN 202110179334 A CN202110179334 A CN 202110179334A CN 112935125 A CN112935125 A CN 112935125A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 94
- 239000002184 metal Substances 0.000 title claims abstract description 94
- 238000004519 manufacturing process Methods 0.000 title claims description 38
- 238000000034 method Methods 0.000 claims abstract description 124
- 230000008569 process Effects 0.000 claims abstract description 78
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims description 37
- 238000003466 welding Methods 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 8
- 238000004080 punching Methods 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 238000004806 packaging method and process Methods 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 239000000047 product Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012858 packaging process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000000565 sealant Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 235000013334 alcoholic beverage Nutrition 0.000 description 2
- 235000014171 carbonated beverage Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 235000013324 preserved food Nutrition 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000004826 seaming Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 235000013616 tea Nutrition 0.000 description 2
- 239000005028 tinplate Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003811 curling process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Images
Classifications
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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
- B21D51/18—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention provides a preparation method of a metal can and the metal can, relates to the technical field of metal packaging, and aims to solve the technical problem that a can body of an existing metal can is prone to mechanical damage in a forming process. The preparation method of the metal can comprises the following steps: a prefabricating preparation process, namely processing a metal substrate to be processed into a preformed tank body; a forming procedure, wherein the preformed tank body is processed into a formed tank body by adopting flexible forming; and the subsequent step of processing the formed tank body into a tank body product. The invention can prevent the tank body from generating mechanical damage in the forming process, reduces the damage to the tank body in the forming process, ensures the corrosion resistance in the tank body and prolongs the service life of the metal tank.
Description
Technical Field
The invention relates to the technical field of metal packaging, in particular to a metal can and a preparation method thereof.
Background
The metal packaging industry belongs to the resource consumption type industry, and metal cans are mostly adopted for metal packaging for filling tea beverages, carbonated beverages, alcoholic beverages and canned foods.
The metal can generally comprises at least a top cover and a can body, and the flanging of the can body and the round edge of the top cover are mutually hooked and pressed through seaming to realize sealing. The mechanical hard die is mainly used for forming the can body and provided with a rotating shaft, the mechanical hard die stretches into the can body cylinder from the bottom or the top during forming, the mechanical hard die rotates around the rotating shaft and is propped open, and the inner wall surface of the can body, which is propped by the mechanical hard die, enables the can body to be formed.
However, in the conventional can body forming method, mechanical damage is easily generated inside the can body in the processing process, so that the corrosion resistance inside the can body is reduced, and the service life of the metal can is shortened.
Disclosure of Invention
In order to solve at least one problem mentioned in the background art, the invention provides a method for manufacturing a metal can and the metal can, which can prevent the can body from generating mechanical damage in the forming process, reduce the damage to the can body in the forming process, ensure the corrosion resistance in the can body and prolong the service life of the metal can.
In order to achieve the above object, in one aspect, the present invention provides a method of manufacturing a metal can, comprising:
and a prefabricating process, namely processing the metal substrate to be processed into a preformed tank body.
And a forming procedure, wherein the preformed tank body is processed into a formed tank body by adopting flexible forming.
And the subsequent process step, processing the formed tank body into a tank body product.
According to the preparation method of the metal can, the metal substrate can be processed into the preformed can body through the prefabrication preparation process, and the preformed can body is processed into the formed can body through the flexible forming process, wherein the flexible forming process adopts flexible pressure to wholly press the can body, so that the whole force of the can body is uniform, stress concentration is avoided, the phenomenon of stress concentration caused by local stress concentration of the can body when a hard die is expanded is avoided, the phenomenon that the can body is subjected to hard touch and the hard die is expanded in the pressing process is also avoided, the can body is prevented from being mechanically damaged in the forming process, the damage to the can body in the forming process is reduced, the corrosion resistance in the can body is ensured, and the service life of the metal can is prolonged.
In the above method for manufacturing a metal can, optionally, in the forming step, the method specifically includes:
and an installation procedure, namely installing the preformed tank body into an accommodating cavity of a mold, and installing the flexible pressing piece into an inner cavity of the preformed tank body.
And a pressing process, wherein the flexible pressing piece extrudes the preformed tank body so that the preformed tank body is tightly abutted to the mold and deforms, and the preformed tank body deforms into the formed tank body.
In the above method for manufacturing a metal can, optionally, the flexible pressing member is a flexible bag body, the flexible bag body is filled with fluid, and the pressure of the fluid in the flexible bag body is adjustable.
In the above method for manufacturing a metal can, the fluid may be an inert gas or an oil.
In the above method for manufacturing a metal can, the preformed can body may include a can bottom and a can body, and the can bottom and the can body may be integrally formed.
In the above method for manufacturing a metal can, optionally, in the pre-preparation step, the method specifically includes:
and a first blanking procedure, namely cutting the metal substrate to be processed into a can body blank.
And a cup punching process, namely, the cup punching process is carried out on the can body blank to form a bottom-shaped can body.
And a stretch forming step of forming the preform can body by stretching the bottom-type can body.
In addition, the pressing step specifically includes:
and extruding the tank bottom and the tank body by adopting the flexible pressing piece so as to enable the tank bottom and/or the tank body to be tightly abutted against the mold and deform.
In the above method for manufacturing a metal can, optionally, the preformed can body includes a split can bottom and a split can body, and the split can bottom and the split can body are separately arranged.
In the above method for manufacturing a metal can, optionally, in the pre-preparation step, the method specifically includes:
and a second blanking procedure, namely cutting the metal substrate to be processed into a split can body blank and a split can bottom blank.
And a welding process, namely rolling the split can body blank and welding the split can body blank into a cylindrical can body.
And a stamping process, wherein the split tank bottom blank is stamped to form a bottom-shaped tank bottom.
Wherein the cylindrical can body forms the preformed can body.
In addition, the pressing step specifically includes:
and extruding the cylindrical can body by adopting the flexible pressing piece so that the cylindrical can body is tightly abutted to the die and deforms, and the cylindrical can body deforms into a formed can body.
Wherein the shaped can body forms the shaped can body.
In the above method for manufacturing a metal can, optionally, the subsequent step further includes:
and a necking and flanging step of performing necking treatment and flanging treatment on the opening part of the formed can body.
And a sealing procedure, namely performing double-edge curling treatment on the split tank bottom and the formed tank body after necking and flanging to form the tank body product.
In another aspect, the present invention provides a metal can, which is manufactured by the above method for manufacturing a metal can.
According to the metal can provided by the invention, the preformed can body is processed into the formed can body by adopting the flexible forming process, wherein the flexible forming process adopts flexible pressure to wholly press the can body, so that the whole can body is uniformly stressed, stress concentration is avoided, the phenomenon of stress concentration caused by local part of the can body when a hard die is propped up is avoided, the phenomenon that the can body is hard to touch and the hard die is propped up in the pressing process is also avoided, the can body is not mechanically damaged in the forming process, the damage to the can body in the forming process is reduced, the corrosion resistance in the can body is ensured, and the service life of the metal can is prolonged.
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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flow chart of a method for manufacturing a metal can according to an embodiment of the present invention;
fig. 2 is a flowchart of a forming process in a method for manufacturing a metal can according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for manufacturing a two-piece can in a metal can according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for manufacturing a three-piece can of a metal can according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method of making a can end and a can lid for a metallic can according to an embodiment of the present invention;
fig. 6 is a schematic structural view of a metal can body according to a second embodiment of the present invention before forming;
fig. 7 is a schematic structural diagram of a metal can body after being formed according to a second embodiment of the present invention.
Description of reference numerals:
10-unformed can body;
and 20-forming the can body.
Detailed Description
In the field of metal packaging, metal cans are often used for metal packaging of tea beverages, carbonated beverages, alcoholic beverages, and canned foods. The metal can generally comprises at least a top cover and a can body, and the flanging of the can body and the round edge of the top cover are mutually hooked and pressed through seaming to realize sealing. The forming of the can body mainly adopts mechanical expansion forming, a rotating shaft is arranged at the center of a mechanical hard die, the mechanical hard die stretches into the can body cylinder from the bottom or the top during forming, the mechanical hard die rotates around the rotating shaft and expands, and the mechanical hard die expands the inner wall surface of the can body to form the can body. However, in the existing can body forming method, when the mechanical hard mold is used for expanding the can body, on one hand, the can body is hard to touch hard in the pressing process, and on the other hand, when the mechanical hard mold is used for expanding the can body, acting force is only applied to a certain area of the can body, so that the whole stress of the can body is uneven, the stress concentration phenomenon of the can body is easy to generate, the mechanical damage is easy to generate in the can body, the corrosion resistance in the can body is directly reduced due to the mechanical damage, and the pressure bearing capacity of the metal can be reduced.
The invention provides a preparation method of a metal can and the metal can, wherein a metal substrate is processed into a preformed can body through a pre-preparation process, and the preformed can body is processed into a formed can body through a flexible forming process, wherein the flexible forming process adopts flexible pressure to wholly press the can body, so that the whole stress of the can body is uniform, stress concentration is avoided, the phenomenon of stress concentration caused by local part of the can body when a hard die is expanded is avoided, the phenomenon that the can body is hard to touch and the hard die is expanded in the pressing process is also avoided, the can body is prevented from mechanical damage in the forming process, the damage to the can body in the forming process is reduced, the corrosion resistance in the can body is ensured, and the service life of the metal can is prolonged.
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. 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. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for manufacturing a metal can according to a first embodiment of the present invention, and as shown in fig. 1, the method for manufacturing a metal can according to the first embodiment of the present invention includes the following steps:
s101: and a prefabricating process, namely processing the metal substrate to be processed into a preformed tank body.
It should be noted that the metal substrate may be tinplate, chromed sheet, or aluminum alloy, and the metal can may be a two-piece can or a three-piece can, wherein the two-piece can is mostly made of aluminum alloy, and the three-piece can is mostly made of tinplate, and the present embodiment does not limit the type of the metal can and the type of the metal substrate.
S102: and a forming procedure, wherein the preformed tank body is processed into a formed tank body by adopting flexible forming.
Specifically, the flexible pressure in the flexible forming process applies pressure to the whole tank body, so that the whole tank body is uniformly stressed, stress concentration cannot be generated, the phenomenon of stress concentration caused by the local part of the tank body when a hard die is expanded is avoided, the phenomenon that the tank body is hard to touch and expand by the hard die in the pressure applying process is also avoided, the tank body cannot be mechanically damaged in the forming process, the damage to the tank body in the forming process is reduced, the corrosion resistance in the tank body is ensured, and the bearing capacity of the metal tank is improved.
S103: and the subsequent step of processing the formed tank body into a tank body product.
It should be noted that, for different types of metal cans, the specific processes in the subsequent steps may be different, for example: the subsequent processes of the two-piece can comprise trimming, optical inspection, packaging and the like, and the subsequent processes of the three-piece can comprise necking, flanging, sealing, leakage detection, packaging and the like.
Further, as shown in fig. 2, the molding process may include the following processes:
s201: and an installation procedure, namely installing the preforming tank body into the accommodating cavity of the mold, and installing the flexible pressing piece into the inner cavity of the preforming tank body.
S202: and a pressing procedure, wherein the preformed tank body is extruded by the flexible pressing piece so that the preformed tank body is tightly abutted to the mold and deforms, and the preformed tank body deforms into a formed tank body.
Specifically, the mould can be the circular cavity body, and the mould comprises at least two parts, and the inner chamber shape of mould can carry out predesigned processing according to user's requirement, can become required shape with preforming jar body processing like this.
Further, the forming device can further comprise a chassis and a cover plate, the chassis supports the preformed tank body, the die wraps the cylinder body of the preformed tank body, the flexible pressing piece can be located in the center of the cover plate and extends into the inner cavity of the preformed tank body, the cover plate, the chassis and the die enclose a closed space, the flexible pressing piece guides pressure, the cylinder body of the preformed tank body is extruded to deform along with the shape of the die, after the forming process is completed, the flexible pressing piece releases pressure, the cover plate moves upwards, the die is opened, and the forming of the preformed tank body is completed.
It should be noted that, in the prior art, the mechanical hard mold is located in the inner cavity of the preformed tank body, the mechanical hard mold rotates around the central axis and is expanded, the mechanical hard mold expands the inner wall surface of the preformed tank body to form the preformed tank body, and the forming process can only change regularly around the central axis of the preformed tank body, so the shape of the product is relatively simple.
Further, the flexible casting die can be flexible utricule, flexible utricule intussuseption is filled with the fluid, the fluid pressure in the flexible utricule is adjustable, fluid can exert pressure to the whole of preforming jar body through the area pressure, make the pressure that the whole of preforming jar body bore even, and can not cause mechanical damage to the can body of preforming jar body, avoided the uneven local that leads to of can body atress to prop and rise, thereby avoided local material attenuate, also can not make the inside trace that props and rise of can body, the harm of forming process to the jar body has been reduced, the bearing capacity of metal can has been improved.
It should be noted that, the thickness and material of the preformed tank body are different, and the pressure required when the preformed tank body is formed is also different, so that the fluid pressure can be adjusted to enable the flexible pressing member to meet the metal with different thicknesses, and the application range of the flexible pressing member is wider.
Further, the fluid may be an inert gas such as helium, neon or argon, or an oil body such as a non-additive agent type, a rust-proof, oxidation-resistant type or an antiwear type, and the specific types of the inert gas and the oil body are not limited in this embodiment, and may be selected by a user as needed.
It should be noted that the metal can may be a two-piece can or a three-piece can, and in the first aspect, the present embodiment is further described by taking a two-piece can as an example.
In one embodiment, the preformed can body includes a can end and a can body, which are integrally formed. It should be noted that the two-piece can generally includes a can body and a can cover, in this embodiment, the can bottom and the can body are the can body, the can cover is manufactured by a separate process, and the can body manufacturing method can adopt the manufacturing method of fig. 3.
Further, the pre-preparation process may specifically include:
s301: and a first blanking procedure, namely cutting the metal substrate to be processed into a can body blank.
In general, a step of selecting a material and coil lubrication may be performed before the first blanking step, and for example, an alloy having high plasticity, high strength, and excellent deep drawability and weldability may be selected. The coil can be lubricated by a lubricant so as to facilitate the processing of the subsequent process. In the first blanking process, a blanking machine can be used to cut the metal substrate to be processed into a circular can body blank.
S302: and a cup punching process, namely, punching the can body blank into a cup to form the bottom-shaped can body.
Specifically, the can body blank can be placed on a cup stand, and after positioning, the can body blank is subjected to cup punching by a punch to form a bottom-type can body.
S303: and a stretch forming step of stretching the bottom-type can body to form a preformed can body.
Specifically, in the stretch forming process, the bottom-type can body can be stretched once and stretched twice by adopting a stretching die, so that the bottom-type can body can be subjected to preliminary plasticity to form a preformed can body.
S304: and a forming procedure, wherein the preformed tank body is processed into a formed tank body by adopting flexible forming.
In addition, the pressing process specifically includes:
and (3) extruding the tank bottom and the tank body by adopting a flexible pressing piece so that the tank bottom and/or the tank body is tightly abutted against the mold and is deformed.
It should be noted that the mold in this embodiment is only located at the periphery of the cylinder wall of the can body, but is not limited to the outside of the cylinder wall, and may also be located on the chassis, and when the can bottoms of the two cans need to be shaped, the mold may be set on the chassis, so that the can bottoms may also be shaped.
S105: the subsequent processes can comprise a trimming process, a cleaning process, a color printing process, a spraying process, a detection process and a packaging process.
Specifically, in the trimming step, the mouth of the molded can body is cut to be uniform by a trimmer. In the cleaning procedure, a cleaning machine is adopted to clean metal chips, lubricants and other impurities on the formed tank body, and then drying is carried out. In the color printing process, the outer surface of the formed tank body can be coated with the ground color, then dried, and then the formed tank body is sprayed by adopting a color printer.
Further, in the spraying process, an internal sprayer may be used to apply a protective layer to the inner surface of the formed can body. In the detection and packaging process, the formed tank body can be detected, whether holes or other defects exist or not is detected, and then qualified products are packaged.
In the second aspect, the present embodiment is described by taking a three-piece can as an example.
As another realizable embodiment, the preformed can body includes a split can bottom and a split can body, which are arranged separately.
In addition, the three-piece can comprises a split can body, a split can bottom and a split can cover, the split can body, the split can bottom and the split can cover are sealed in a rolling manner, the split can cover and the split can bottom are manufactured by adopting separate processes in the embodiment, and the manufacturing method of the split can body can adopt the manufacturing method of fig. 4.
Specifically, the preparation process specifically includes:
s401: and a color printing process, namely printing the color layout on the surface of the primary color substrate to obtain the metal substrate.
S402: and a second blanking procedure, namely cutting the metal substrate to be processed into a split can body blank.
S403: and a welding process, namely rolling the split can body blank and welding the split can body blank into a cylindrical can body.
Specifically, firstly, the split can body blank is subjected to deflection treatment by a group of rollers and wedge-shaped steel blocks, and the deflection treatment mainly has the following effects: the crystal structure in the split can body blank is disturbed, the internal stress is eliminated, the split can body blank is easy to form, the shape is stable after the split can body blank is formed into a cylindrical can body, the elastic resilience is reduced, and the welding quality is ensured. Further, the split can body blank is passed through a rounding device to form a cylindrical body, and the cylindrical body is welded by resistance welding to form a cylindrical can body.
In the electric resistance welding, the electric resistance heat generated by passing a current through the welded material and the contact portion is used as a heat source to locally heat the welded material and apply pressure to the welded material. During welding, metal does not need to be filled, the production efficiency is high, the deformation of a weldment is small, and the automation is easy to realize.
S404: and in the welding seam coating supplementing process, a coating system is adopted to supplement and coat the coating on the welding seam.
Specifically, the high-voltage electrostatic device can be used for coating on the joint, the electrostatic powder coating system applies a positive voltage of 20-40KV to the spray gun, so that an electrostatic induction field is formed between the spray gun and the empty tank, the empty tank is a negative electrode, the powder sprayed out of the spray gun is provided with a positive electrode, and the powder coating is adsorbed on the split tank body by electrostatic attraction.
S405: and (5) a supplementary coating and drying process, wherein the coating is dried to be solidified.
Specifically, the drying and curing modes can be hot air, direct fire and infrared lamp heating modes. The embodiment does not limit the specific manner of drying and curing.
S406: and a forming procedure, wherein the preformed tank body is processed into a formed tank body by adopting flexible forming.
The cylindrical can body after the welding step may be subjected to a weld bead repair coating step and a repair coating drying step to form a preform can body.
In addition, the pressing process specifically includes:
and extruding the cylindrical can body by adopting the flexible pressing piece so that the cylindrical can body is tightly abutted to the die and deforms, and the cylindrical can body deforms to form the formed can body. In particular, the formed can body may be a formed can body.
Further, in the subsequent process, the method further comprises:
s407: and a necking and flanging step for performing necking and flanging on the opening part of the formed can body.
S408: and (5) a sealing procedure, namely performing double-edge curling treatment on the split can bottom and the formed can body after necking and flanging to form a can body product.
S409: and the subsequent processes can comprise a leakage detection process and a packaging process.
In the present embodiment, as shown in fig. 5, there is provided a method for manufacturing a can bottom and a can lid of a metal can, which includes:
s501: and a second blanking procedure, namely cutting the metal substrate to be processed into a split tank bottom blank or a split tank cover blank.
S502: and a stamping process, wherein the blank of the split tank bottom or the blank of the split tank cover is stamped to form a bottom tank bottom or a bottom tank cover.
S503: and a curling process, namely, passing the bottom can bottom or the bottom can cover through a curling machine to bend the edge of the bottom can bottom or the bottom can cover to a certain angle towards the center.
S504: and in the glue injection process, the sealant is distributed in the plane and the groove of the bottom type tank cover or the bottom of the bottom type tank to play a role in sealing.
S505: and a baking process, wherein the sealant is dried by adopting a baking oven, so that the moisture in the sealant is evaporated, the long-term storage and sealing effects are achieved, and the bottom tank bottom or the bottom tank cover becomes a split tank bottom or a split tank cover.
In the present embodiment, the can body finished product is a can body in which the can bottom and the can body are integrated in the two-piece can middle finger, and the can body in which the can bottom and the split can body are assembled in the three-piece can middle finger does not include the assembly of the can cover, and the can cover needs to be assembled after the can body is filled.
Example two
Fig. 6 is a schematic structural diagram of a metal can body according to a second embodiment of the present invention before forming the can body. Fig. 7 is a schematic structural diagram of a metal can body after being formed according to a second embodiment of the present invention.
Referring to fig. 6 and 7, on the basis of the first embodiment, the second embodiment of the present invention provides a metal can, which is manufactured by the method for manufacturing the metal can.
Specifically, the unformed can body 10 is cylindrical, during specific forming, the chassis holds the unformed can body 10, the mold wraps the can body of the unformed can body 10, the flexible pressing piece can be located in the center of the cover plate, the flexible pressing piece extends into the inner cavity of the unformed can body 10, the cover plate, the chassis and the mold form a closed space, pressure is introduced by the flexible pressing piece, the can body extruding the unformed can body 10 deforms along with the shape of the mold, after the forming process is completed, the flexible pressing piece is used for releasing pressure, the cover plate moves upwards, the mold is opened, and the unformed can body 10 is processed into the formed can body 20.
According to the metal can provided by the invention, the preformed can body is processed into the formed can body by adopting the flexible forming process, wherein the flexible forming process adopts flexible pressure to wholly press the can body, so that the whole can body is uniformly stressed, stress concentration is avoided, the phenomenon of stress concentration caused by local part of the can body when a hard die is propped up is avoided, the phenomenon that the can body is hard to touch and the hard die is propped up in the pressing process is also avoided, the can body is not mechanically damaged in the forming process, the damage to the can body in the forming process is reduced, the corrosion resistance in the can body is ensured, and the pressure bearing capacity of the metal can is improved.
In the description of the embodiments of the present invention, it should be understood that the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements, unless expressly stated or limited otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of making a metal can, comprising:
a prefabricating preparation process, namely processing a metal substrate to be processed into a preformed tank body;
a forming step of processing the preformed can body into a formed can body by flexible forming;
and the subsequent process step, processing the formed tank body into a tank body product.
2. The method of manufacturing a metal can according to claim 1, wherein the molding process specifically includes:
an installation procedure, namely installing the preformed tank body into an accommodating cavity of a mold, and installing a flexible pressing piece into an inner cavity of the preformed tank body;
and a pressing process, wherein the flexible pressing piece extrudes the preformed tank body so that the preformed tank body is tightly abutted to the mold and deforms, and the preformed tank body deforms into the formed tank body.
3. The method of manufacturing a metal can according to claim 2, wherein the flexible pressing member is a flexible bladder body filled with a fluid, and the pressure of the fluid in the flexible bladder body is adjustable.
4. A method of manufacturing a metal can according to claim 3, wherein the fluid is an inert gas or an oil body.
5. The method of making a metal can according to claim 2, wherein said preformed can body comprises a can end and a can body, said can end and can body being integrally formed.
6. The method of manufacturing a metal can according to claim 5, wherein the preliminary manufacturing process specifically includes:
a first blanking procedure, wherein the metal substrate to be processed is cut into a can body blank;
a cup punching process, namely, punching the can body blank into a cup to form a bottom-shaped can body;
a stretch forming step of forming the preform can body by stretching the bottom-type can body;
in addition, the pressing step specifically includes:
and extruding the tank bottom and the tank body by adopting the flexible pressing piece so as to enable the tank bottom and/or the tank body to be tightly abutted against the mold and deform.
7. The method of making a metal can according to claim 2, wherein said preformed can body comprises a split can bottom and a split can body, said split can bottom and said split can body being arranged in a split configuration.
8. The method of manufacturing a metal can according to claim 7, wherein the preliminary manufacturing process specifically includes:
a second blanking procedure, wherein the metal substrate to be processed is cut into a split can body blank and a split can bottom blank;
a welding step of rolling and welding the split can body blank into a cylindrical can body;
a stamping procedure, wherein the split tank bottom blank is stamped and processed to form a bottom-shaped tank bottom;
wherein the cylindrical can body forms the preform can body;
in addition, the pressing step specifically includes:
the flexible pressing piece is adopted to extrude the cylindrical can body so that the cylindrical can body is tightly abutted to the die and deforms, and the cylindrical can body deforms to form a formed can body;
wherein the shaped can body forms the shaped can body.
9. The method of manufacturing a metal can according to claim 7, further comprising, in the subsequent step:
a necking and flanging step of performing necking and flanging on the opening of the formed can body;
and a sealing procedure, namely performing double-edge curling treatment on the split tank bottom and the formed tank body after necking and flanging to form the tank body product.
10. A metal can, characterized in that it is produced by the method of any one of the preceding claims 1 to 9.
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| CN202110179334.XA CN112935125A (en) | 2021-02-09 | 2021-02-09 | Method for producing metal can and metal can |
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| CN202110179334.XA CN112935125A (en) | 2021-02-09 | 2021-02-09 | Method for producing metal can and metal can |
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| CN112935125A true CN112935125A (en) | 2021-06-11 |
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