CN109332522B - Manufacturing process of rotary-opening tank and rotary-opening tank - Google Patents
Manufacturing process of rotary-opening tank and rotary-opening tank Download PDFInfo
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- CN109332522B CN109332522B CN201811034900.2A CN201811034900A CN109332522B CN 109332522 B CN109332522 B CN 109332522B CN 201811034900 A CN201811034900 A CN 201811034900A CN 109332522 B CN109332522 B CN 109332522B
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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
- B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
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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
-
- 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
- B21D51/40—Making outlet openings, e.g. bung holes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Closures For Containers (AREA)
Abstract
The invention provides a manufacturing process of a screw-top can, which is reasonable. The invention relates to a manufacturing process of a screw-top can, which comprises the following steps: firstly, stamping a metal plate into a cup-shaped blank; step two, stretching the cup-shaped blank to form a can blank, wherein the can blank is provided with an integrally formed can opening, a can body and a can bottom; step three, reducing the outer peripheral wall of the tank bottom for one time or more than one time to form a first reducing section; punching and straightening the bottom wall of the tank bottom, and rolling at the opening to form a rotary-opening tank opening; step five, trimming the opening of the can opening to form the bottom of the rotary-opening can; sixthly, forming a corresponding threaded opening and a corresponding safety ring by the first diameter-reducing section through threads and rolling ribs from top to bottom; seventhly, sealing a top cover at the mouth of the screw-mouth can or sealing a bottom cover at the bottom of the screw-mouth can to obtain the screw-mouth can; the sequence of the fifth step and the sixth step is adjustable. The invention also relates to a rotary-opening tank.
Description
Technical Field
The invention relates to the technical field of a screw-on can, in particular to a manufacturing process of a screw-on can. The invention also relates to a screw-on can manufactured by the manufacturing process of the screw-on can.
Background
The metal cans are divided into two-piece cans and three-piece cans according to the production process of the metal cans. The three-piece can is characterized in that the can cover, the can bottom and the can body are respectively formed by processing a metal sheet, the can body is provided with a welding line in the vertical direction, and the can cover, the can bottom and the can body are combined together through rolling and sealing. The two-piece can is formed by processing two metal sheets, wherein the can cover is formed by processing one metal sheet, the can body and the can bottom are formed by only using the other metal sheet through strong stamping, stretching and rolling, and the can body has no seam.
The process of the rotary-opening tank produced by DWI (drawing and ironing) process is complicated, the number of the working procedures is as large as more than 50, and the working procedures of the rotary-opening part are nearly 30.
Disclosure of Invention
The invention provides a manufacturing process of a screw-top can, which is reasonable.
The technical scheme of the manufacturing process of the screw-top can comprises the following steps:
firstly, stamping a metal plate into a cup-shaped blank;
step two, stretching the cup-shaped blank to form a can blank, wherein the can blank is provided with an integrally formed can opening, a can body and a can bottom;
reducing the outer peripheral wall of the tank bottom for one or more times to form a first reducing section;
punching and straightening the bottom wall of the tank bottom, and rolling at the opening to form a rotary-opening tank opening;
step five, trimming the opening of the can opening to form the bottom of the rotary-opening can;
sixthly, forming a corresponding threaded opening and a corresponding safety ring by the first diameter-reducing section through threads and rolling ribs from top to bottom;
seventhly, sealing a top cover at the mouth of the screw-mouth can or sealing a bottom cover at the bottom of the screw-mouth can to obtain the screw-mouth can;
the sequence of the fifth step and the sixth step is adjustable.
Preferably, the first and second liquid crystal materials are,
in the third step, the first reducing section comprises two conical diameter parts which are arranged at intervals up and down, and a reducing part is arranged between the two conical diameter parts.
Preferably, the first and second liquid crystal materials are,
the sixth step specifically comprises:
forming a thread screwing port on the outer peripheral wall thread of the reducing part;
and rolling ribs at the joint of the reduced diameter part and the conical diameter part positioned below to form an inwards concave annular recess, thus obtaining the safety ring.
Preferably, the first and second liquid crystal materials are,
step eight is further included after the step five and before the step seven, and the step eight specifically includes:
straightening the tank opening;
reducing the outer peripheral wall of the tank opening for one time or more than one time to form a second reducing section;
and flanging the edge of the second reducing section.
Preferably, the first and second liquid crystal materials are,
a ninth step is further included after the fourth step and before the seventh step, and the ninth step specifically includes:
and tightly pressing and flattening the edge of the edge rolling position of the can opening of the rotary opening can.
The invention also provides a rotary-opening tank manufactured by the manufacturing process, which comprises a rotary-opening tank bottom, a rotary-opening tank body and a rotary-opening tank opening which are sequentially and integrally formed;
the mouth of the rotary-mouth tank comprises a first reducing section, and the first reducing section is sequentially provided with a threaded rotary mouth and a safety ring from top to bottom;
the top cover is sealed on the mouth of the rotary-mouth tank or the bottom cover is sealed at the bottom of the rotary-mouth tank.
Preferably, the first and second liquid crystal materials are,
the first reducing section comprises two conical diameter parts which are arranged at intervals up and down along the direction away from the mouth of the rotary-mouth tank, and a reducing part is arranged between the two conical diameter parts.
Preferably, the first and second liquid crystal materials are,
the threaded screwing opening is positioned on the outer peripheral wall of the diameter reducing part; the safety ring is located between the screw part and the tapered diameter part located below.
Preferably, the first and second liquid crystal materials are,
the tank bottom of the rotary-opening tank comprises a second reducing section, and a flanging is arranged at the edge of the second reducing section.
Preferably, the first and second liquid crystal materials are,
the rotary-opening tank body is of a cylindrical structure.
According to the manufacturing process, the manufacturing process of the rotary-opening can is that the can opening of the rotary-opening can and the can bottom of the rotary-opening can are formed in a reverse machining mode, namely the can bottom of the can blank formed by stretching in the step two is formed into the can opening of the rotary-opening can through processes of reducing diameter, punching, straightening, rolling, thread ribbing and the like, the can opening of the can blank is formed into the can bottom of the rotary-opening can through processes of trimming, straightening or hobbing and the like, then the can bottom of the rotary-opening can and the bottom cover are sealed to form the rotary-opening can without a top cover, or the can opening of the rotary-opening can and the top cover are sealed to form the rotary-opening can without a bottom cover, so that the contents can be conveniently filled and sealed.
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 flow chart of an embodiment of a manufacturing process for a spin-on can of the present invention;
FIG. 2 is a flow chart of another embodiment of a manufacturing process for a spin-on can of the present invention;
FIGS. 3(a) and 3(b) are views showing the structure of a non-screwed top cover or bottom cover of a screw-top can according to the present invention;
fig. 4 is an overall structure view of a screw-on can of the present invention.
Detailed Description
The invention provides a manufacturing process of a screw-top can, which is reasonable.
As shown in fig. 1, the manufacturing process of the screw-top can of the present invention comprises the following steps:
In this process, a metal plate is stamped into a cup-shaped blank, the metal plate having a thickness that can be selected based on the actual situation.
And 102, stretching the cup-shaped blank to form a can blank, wherein the can blank is provided with a can opening, a can body and a can bottom which are integrally formed.
In this process, the cup-shaped blank is drawn more than once (including once) to form a can blank.
The tank blank is provided with an integrally formed tank opening, a tank body and a tank bottom, and the tank body can be of a cylindrical structure with a constant diameter.
And 103, reducing the outer peripheral wall of the tank bottom once or more than once to form a first reducing section.
In this step, the cup-shaped blank punched in step 102 is first opened downward, that is, the opening of the cup-shaped blank is opened downward, and then the outer peripheral wall of the can bottom, that is, the upper side of the can body away from the opening, is reduced one or more times to form a first reduced diameter section.
The diameter reduction times can be once, twice, three times or even more.
And 104, punching and straightening the bottom wall of the can bottom, and rolling the bottom wall at the opening to form a rotary opening can opening.
In the working procedure, the bottom wall of the can bottom with the first reducing section is punched and straightened, and then the opening is rounded to form a rotary-opening can opening.
Punching a hole at tank bottoms diapire and flare-outing, the edge curling of can mouthful can be further tightened the limit to this circle curling of mouthful can mouthful soon, will revolve the edge curling department of mouthful can mouthful and flatten to the area that circle curling department probably exposed iron is through tight limit process after, makes it roll up in tight limit the inside completely, makes mouthful can mouthful more pleasing to the eye and safety soon. Of course, if the coil is deep enough, the can mouth of the screw-top can may be formed into a final finished can without the step of tightening the edge if there is no iron present.
And 105, trimming the opening of the can opening to form the bottom of the rotary-opening can.
In this process, the edge of the opening of the can mouth is trimmed to form a screw-top can bottom.
The diameter of the bottom of the rotary-opening tank can be the same as that of the tank body of the rotary-opening tank, so that a straight tank is formed.
After trimming, straightening the can opening or directly cutting the can opening to the bottom, reducing the diameter and flanging to finally form the bottom of the rotary-opening can.
And 106, forming a corresponding threaded opening and a corresponding safety ring by the first diameter-reducing section through the screw threads and the rolling ribs from top to bottom.
In the working procedure, the first reducing section forms a threaded opening through threads, and a safety ring, namely an anti-theft ring, is formed below the threaded opening through a rolled rib.
And step 107, sealing a top cover at the mouth of the screw-on can or sealing a bottom cover at the bottom of the screw-on can to obtain the screw-on can.
In this process, after the integrally formed can mouth, body and bottom of the screw-top can are obtained in steps 103, 104, 105 and 106, a top lid may be sealed to the mouth of the screw-top can or a bottom lid may be sealed to the bottom of the screw-top can, thereby forming the screw-top can.
It should be noted that the order of step 105 and step 106 is not specifically limited, that is, after step 104, the order of step 105 and step 106 may be interchanged. For example, the drawn can blank is first reduced in diameter, punched and straightened, rolled to form a can mouth, trimmed and straightened to form a can bottom, or reduced in diameter, punched and straightened, trimmed, straightened and then rolled to form a can bottom, and the can body is reduced in diameter, punched and straightened, rolled to form a can bottom, and then the can bottom is straightened and trimmed, and then the reduced in diameter is rolled to form a rib.
The number of times of stretching and reducing as mentioned above may be set to one or more times depending on the size of the can, and the present invention is not particularly limited.
According to the manufacturing process, the manufacturing process of the rotary-opening can is reverse processing forming of the can opening and the can bottom, namely the can bottom of the can blank formed by stretching in the step two is changed into the rotary-opening can opening through processes of reducing diameter, punching and straightening, rolling, thread rib rolling and the like, the can opening of the can blank is changed into the rotary-opening can bottom through processes of trimming, straightening or hobbing and the like, and then the rotary-opening can bottom and the bottom cover are sealed to form the rotary-opening can without a top cover or the top cover is sealed on the rotary-opening can opening to form the rotary-opening can with the top cover and the bottom cover, so that the contents can be conveniently filled and sealed.
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.
As shown in fig. 2, the manufacturing process of the screw-top can of the present invention comprises the following steps:
In this process, a metal plate is punched into a cup shape by a punching die such as a punching machine to obtain a cup-shaped blank, and the punched cup-shaped blank is opened downward.
The metal plate includes, but is not limited to, coated iron, tinplate (tinplate), chrome-plated steel sheet, cold-rolled steel sheet, aluminum sheet, coated aluminum sheet, stainless steel sheet, and the like. The thickness of the metal plate can be thickened or thinned according to actual needs.
And 202, stretching the cup-shaped blank to form a can blank, wherein the can blank is provided with a can opening, a can body and a can bottom which are integrally formed.
In this process, the cup-shaped blank is transferred into a drawing die by a can transfer system, and the cup-shaped blank is drawn by the drawing die such as a drawing punch once or more than once to form a can blank having a predetermined aspect ratio, for example, the aspect ratio of the can blank obtained by drawing is more than three times, but not limited specifically.
When stretching, the pressing edge at the edge of the can opening is pressed, and a proper pressing force is applied to the pressing edge, so that the bad phenomena of wrinkling, cracking, scratching, snapping and the like can not occur in the process of stretching the cup-shaped blank body to form the can blank, and the can body after multiple times of stretching can be cylindrical with a constant diameter.
It should be noted that the number of stretching in step 202 may be one, two, three or more, and is intended to form can blanks with different aspect ratios, and the number of stretching is not particularly limited.
And step 203, reducing the outer peripheral wall of the tank bottom once or more than once to form a first reducing section, so as to prepare the reducing blank tank.
In this step, the drawn can body is first transferred into a reducing die by a can transfer system to complete reducing and obtain a reduced diameter can body.
In this step, the outer peripheral wall of the can bottom, i.e., the upper side of the can body away from the can mouth (the can bottom, the can body, and the can mouth are the can bottom, the can body, and the can mouth of the can blank referred to in step 202) is subjected to one or more necking to form a first necking step.
The first reduced diameter section includes two tapered diameter portions arranged at an interval and a reduced diameter portion located therebetween.
In this step, the cross-sectional areas of the two tapered diameter portions gradually decrease from bottom to top, and the diameter of the reduced diameter portion is kept constant. The two tapered diameter portions are defined as an upper tapered diameter portion and a lower tapered diameter portion, respectively.
And step 204, punching, straightening and rolling the bottom wall of the can bottom to form a rotary-opening can opening.
In the working procedure, the diameter-reduced blank can is conveyed into a punching straightening die through a can conveying system to complete the punching straightening forming action, so that the can opening straightening can is obtained.
And then, conveying the tank opening straightening tank into a rolling mould through a tank conveying system, and rolling the opening of the rolling mould for one time or more than one time by using the rolling mould to finish rolling and forming actions to form a rotary-opening tank opening so as to obtain the tank opening rolling tank.
And step 205, trimming the opening of the can opening to form the bottom of the rotary-opening can.
In the process, the tank opening rolled round tank is firstly conveyed into a trimming die through a tank conveying system, the trimming die is used for trimming the tank opening like a trimming machine, for example, a blank holder at the edge of the tank opening is trimmed, and the trimmed blank holder can be directly used as a bottom sealing cover body groove to form the tank bottom trimming tank.
In the process, firstly, the tank opening is straightened, and the tank bottom trimming tank is straightened or directly and circularly cut to obtain the tank bottom straightening tank.
Then the tank opening peripheral wall of the tank bottom straightening tank, namely the lower side of the tank body, namely one side close to the tank bottom of the rotary opening tank is subjected to one or more times of reducing to obtain a second reducing section, and then the edge of the second reducing section is turned outwards.
It should be noted that the straightening, reducing and flanging are not necessary processes for the can bottom of the can with a screw-top, and step 206 may also be omitted, and the trimmed edge is directly used as the flanging, which is used as the body groove of the cover when the bottom cover is sealed, and the size of the flanging is also designed according to the size of the cover.
And 208, rolling ribs below the threaded opening and above the lower conical diameter part to obtain an inwards concave annular recess to form a safety ring.
And 209, tightening the edge of the curled part of the can opening of the rotary opening can in the step 204 to flatten the can opening.
And step 210, sealing a top cover of the mouth of the screw-mouth can or sealing the bottom of the screw-mouth can to obtain the screw-mouth can.
As can be seen from the above manufacturing process, the screw-top can bottom is manufactured in steps 205 and 206, the screw-top can body is manufactured in step 202, and the screw-top can mouth is manufactured in steps 203, 204, 207, 208, and 209.
As shown in fig. 3(a) and (b), the screw-top can manufactured by the manufacturing process shown in fig. 1 and 2 comprises, from bottom to top, a screw-top can bottom 1, a screw-top can body 3, and a screw-top can mouth 10, which are integrally formed.
The periphery wall of the rotary-opening tank bottom 1 positioned on the lower side of the rotary-opening tank body 3 is provided with a second reducing section 2, and the edge of the second reducing section 2 is provided with a flanging. The opening of the bottom 1 of the screw-mouth tank can be sealed with a bottom cover 9.
The peripheral wall of the rotary-opening tank opening 10 positioned at the upper side of the rotary-opening tank body 3 is provided with a first reducing section. The opening of the mouth 10 of the screw-top can be sealed with a top cover 8.
The first reduced diameter section includes an upper tapered diameter portion 7, a lower tapered diameter portion 4, and a reduced diameter portion therebetween. The lower tapered diameter portion 4 and the upper tapered diameter portion 7 are gradually reduced in sectional area in a direction away from the spin can bottom 1.
The outer peripheral wall of the reducing part is provided with 2-3 circles of threads (the number of the circles of the threads is not specifically limited by the invention) to form a thread screwing port 6, wherein 0.5 circle of threads (the number of the circles of the threads is not specifically limited by the invention) counted from the initial thread of the threads is slightly lower than the normal thread type, so that the screwing-in and the unscrewing of the screw cap are facilitated.
An inward annular recess 5 is arranged between the upper part of the lower conical diameter part 4 and the lower part of the threaded opening 6 to form a safety ring, namely an anti-theft ring.
As shown in fig. 4, after the screw-top can is manufactured by the process shown in fig. 1 and 2, a top cover 8 is sealed at the opening 10 of the screw-top can and a bottom cover 9 is sealed at the opening of the bottom 1 of the screw-top can, respectively, to obtain a complete screw-top can.
The aforementioned screw-top can uses a metal thin plate as a substrate, and the present embodiment is preferably a coated iron, but not limited to a coated iron. Forming a cylindrical can body through a series of cold drawing and stamping (DRD cold drawing and stamping process) by using a die, forming a screw opening part by using a forming die, and finally sealing the top cover 8 or the bottom cover 9 to finish the manufacture of the whole screw opening can.
The rotary-opening tank provided by the invention has the advantages of repeated sealing, more humanized use, various specifications, high product grade, more reasonable manufacturing process and the like. And a metal sheet (preferentially coated iron is used as a substrate) is adopted, so that the advantages of the process for producing the rotary-opening tank, such as the influence on human health, the influence on environmental protection, the influence on safety and the like, compared with the prior art are more prominent.
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 (4)
1. A process for manufacturing a spin-on can, comprising:
firstly, stamping a metal plate into a cup-shaped blank;
step two, stretching the cup-shaped blank to form a can blank, wherein the can blank is provided with an integrally formed can opening, a can body and a can bottom;
reducing the outer peripheral wall of the tank bottom for one or more times to form a first reducing section;
punching and straightening the bottom wall of the tank bottom, and rolling at the opening to form a rotary-opening tank opening;
step five, trimming the opening of the can opening to form the bottom of the rotary-opening can;
sixthly, forming a corresponding threaded opening and a corresponding safety ring by the first diameter-reducing section through threads and rolling ribs from top to bottom;
seventhly, sealing a top cover at the mouth of the screw-mouth can or sealing a bottom cover at the bottom of the screw-mouth can to obtain the screw-mouth can;
the sequence of the fifth step and the sixth step is adjustable;
step eight is further included after the step five and before the step seven, and the step eight specifically includes:
straightening the can opening, wherein the can opening is a can opening of a can blank;
reducing the outer peripheral wall of the tank opening for one time or more than one time to form a second reducing section;
flanging the edge of the second reducing section;
in the third step, the first reducing section comprises an upper tapered diameter part, a lower tapered diameter part and a reducing part positioned between the upper tapered diameter part and the lower tapered diameter part, and the sectional areas of the lower tapered diameter part and the upper tapered diameter part are gradually reduced along the direction far away from the bottom of the rotary-opening tank;
the sixth step specifically comprises:
forming a thread screwing port on the outer peripheral wall thread of the reducing part;
and rolling ribs at the joint of the reducing part and the lower conical diameter part to form an inwards concave annular recess, thus obtaining the safety ring.
2. The manufacturing process of the screw-on can of claim 1, further comprising a ninth step after the fourth step and before the seventh step, wherein the ninth step specifically comprises:
and tightly pressing and flattening the edge of the edge rolling position of the can opening of the rotary opening can.
3. The screw-on can manufactured by the screw-on can manufacturing process according to claim 1 or 2, which is characterized by comprising a screw-on can bottom, a screw-on can body and a screw-on can opening which are sequentially and integrally formed;
the mouth of the rotary-mouth tank comprises a first reducing section, and the first reducing section is sequentially provided with a threaded rotary mouth and a safety ring from top to bottom;
a top cover is sealed on the mouth of the rotary-mouth tank or a bottom cover is sealed at the bottom of the rotary-mouth tank;
the tank bottom of the rotary-opening tank comprises a second reducing section, and a flanging is arranged at the edge of the second reducing section.
4. The screw-on can of claim 3, wherein the screw-on can body is of cylindrical construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811034900.2A CN109332522B (en) | 2018-09-05 | 2018-09-05 | Manufacturing process of rotary-opening tank and rotary-opening tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811034900.2A CN109332522B (en) | 2018-09-05 | 2018-09-05 | Manufacturing process of rotary-opening tank and rotary-opening tank |
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| CN109332522A CN109332522A (en) | 2019-02-15 |
| CN109332522B true CN109332522B (en) | 2021-07-02 |
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| CN110640047A (en) * | 2019-08-23 | 2020-01-03 | 南通福乐华机械有限公司 | Production process of threaded water filling port of automobile water tank |
| CN110576116B (en) * | 2019-09-12 | 2021-07-02 | 广东韩江轻工机械有限公司 | Forming process of rotary opening cover of beer can |
| CN112298728A (en) * | 2020-10-23 | 2021-02-02 | 广东韩江轻工机械有限公司 | Method and system for manufacturing full-opening easy-open-end trapezoidal can |
| CN112894285A (en) * | 2021-02-21 | 2021-06-04 | 福州新德通金属容器有限公司 | Manufacturing method of tea caddy with easy-to-tear cover |
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