CN1736694A - Engineered meridian tyre blank molding method - Google Patents
Engineered meridian tyre blank molding method Download PDFInfo
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- CN1736694A CN1736694A CN 200510044564 CN200510044564A CN1736694A CN 1736694 A CN1736694 A CN 1736694A CN 200510044564 CN200510044564 CN 200510044564 CN 200510044564 A CN200510044564 A CN 200510044564A CN 1736694 A CN1736694 A CN 1736694A
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Abstract
The invention relates to a method for forming a green tyre of an engineering radial-type tyre, which contains: the first: using a flat drum to deposit the vacuum cement and carcass and artificially wind the adhesive gum, to form one-stage carcass bobbin composite element. The second: sending the one-stage carcass bobbin composite element to the spreader to enlarge, and sending to the forming drum, pressing with a compression roller; the shoulder pad gum winding artificially and packing oppositely; and winding the tyre-side with a artificial coiler to complete the forming of second-stage composite element. The third: containing a bet side and a shaping side, depositing by a B&T drum to complete the belt deposition and depositing with tread base gum or transition film to form a belt complex; setting the second-stage composite element to a shaping drum, transporting the belt complex to the center of the shaping drum and assembling with the second-stage composite element, rolling the belt complex with a compression roller; tyre surface winding with a artificial coiler to complete the green tyre forming process.
Description
Technical field
The invention belongs to the manufacturing technology field of tire, especially a kind of sectional forming process of engineered meridian tyre blank.
Background technology
As everyone knows, the tire that is used for engineering truck is called for short the engineering tire, the characteristics of this class tire are that tire appearance and size is big, lifting capacity big, the moulding process difficulty is big, manufacturing enterprise mainly is engaged in the engineering tyre of oblique configuration both at home and abroad, Development and Production goes out the all-steel engineering radial-ply tyre again in recent years, its moulding process is the continuity of radial heavy duty tire technology, adopts the once-through method moulding process basically:
Promptly on auxilliary drum, belt (two-layer, three layers or more multi-layered) is fitted and be compounded to form the belt composite members with tyre surface.
On main drum, carry out applyings such as sidewall, rim of the mouth, type glue, inner liner, carcass, shoulder wedge successively respectively, carry out the tyre bead location then and form main drum composite members.
By the belt transmission ring belt composite members is delivered to main drum centre bit, begin typing, finish the typing back by pressure roller roll-in belt composite members, carry out rim of the mouth, sidewall anti-package by capsule then, after the anti-package roll-in is carried out at the position, sidewall, finish the fetus moulding, by the belt transmission ring fetus is unloaded from make-up machine at last.
Because engineering radial tire is bigger, adopt once-through method molding semi product parts many, and parts are long, weight, difficulty is all compared in carrying when moulding, applying, because parts are many, the interface that fetus is fitted is also just many, and it is unreal to occur easily fitting, even bubble appears, cause potential hidden danger for the inherent quality of tire; Simultaneously because semifinished part is many, and long and weigh the efficient comparison end that makes moulding.The moulding moulded 23.5R25 fetus of general once-through method, overall output per manshift only are about 5.The moulding process of once-through method will guarantee the intensity of tire like this because the restriction of tyre bead diameter makes the diameter of winner's drum smaller in addition, must increase the density of body cord or the intensity of raising carcass steel wire, adopts new wire gauge; And the density that increases body cord can be brought difficulty to the steel wire calendering, and steel wire density is excessive, calendering problem such as occur easily stripping off the skin; Improve the intensity of carcass steel wire or adopt new wire gauge all can take a lot of trouble to require great effort and can increase the cost of tire greatly.In this sense, the once-through method moulding process will be very difficult in the moulding of bigger specification, that is to say that the once-through method moulding process will limit the production of the big specification of engineering radial tire to a certain extent.
Summary of the invention
In order to overcome the technical deficiency of existing engineered meridian tyre blank moulding process, the invention provides a kind of sectional forming method of engineered meridian tyre blank, the purpose of this forming method just provides a kind of new engineering radial tire moulding process, cause potential hidden danger and can under the situation that does not increase new carcass wire gauge, produce the engineering radial tire of bigger specification as much as possible to solve shaping efficiency inherent quality low, that give tire.
The technical solution adopted for the present invention to solve the technical problems is:
One section: the emulation of adopting the flat drum of diameter continuously adjustable to carry out gastight adhesive, carcass applying and adhesive glue is twined, and finally forms one section matrix body tube composite members;
Two sections: form by a segmentation for two sections, the course of work of this segmentation is, at first transmission ring or the clamper by a section is transported to one section matrix body tube composite members on the stretching machine, stretching machine enlarges one section matrix body tube composite members, by the granny rag ring matrix body tube composite members is moved on the broad-adjustable half drum-type assembly drum, carry out again carrying out the pressing of glue core by pressure roller after carcass refers to that row just wraps, detains circle; Carrying out shoulder wedge by the emulation wrapping machine then twines; Respectively anti-package carcass, rim of the mouth type glue are carried out anti-package and roll-in by reverse-wrapped capsule and pressure roller; Carry out the sidewall by the emulation wrapping machine once more at last and twine the moulding of finishing two sections composite members, and two sections composite members are unloaded from half drum-type assembly drum;
Three sections: be divided into belt side and two parts of typing side, finally finish the moulding of fetus in the typing side:
Belt side: adopt and to utilize belt drum to finish belt (two-layer, three layers or more multi-layered) to fit and be compounded to form the belt composite members with tyre surface primer or transition film;
The typing side: by suspender two sections composite members are installed on the setting drum, by the belt transmission ring belt composite members are delivered to a non-rotary bulging center and two sections composite members assemblings, typing then is by pressure roller roll-in belt composite members; After the roll-in setting drum is rotated to tyre surface and twine station, carry out tyre surface by the emulation wrapping machine and twine, finally finish the forming process of fetus, and the fetus of forming is unloaded from setting drum.
The present invention also can realize by following measure: can also be made up of two parallel identical segmentations for said two sections.Emulation is twined and also can be adopted the adhesive glue card to close in one section.Carrying out shoulder wedge by the emulation wrapping machine in two sections twines and can also fit for carry out shoulder wedge by the emulation wrapping machine.Carrying out the sidewall by the emulation wrapping machine in two sections twines and can also fit for carry out the sidewall by the emulation wrapping machine.The number of setting drum is to be one or two in three sections belt sides.Setting drum is fixed or is rotary type in three sections belt sides.Carrying out tyre surface by the emulation wrapping machine in three sections typing sides twines and can also fit for carry out the tyre surface piecemeal by the emulation wrapping machine.Production characteristics according to engineering radial tire in three sections belt side adopt two belt drums in order to raise the efficiency and to be convenient to change specification.The adhesive tape of twining in the emulation winding process is to realize fitting under the situation of 50 ℃~70 ℃ of temperature.
The invention has the beneficial effects as follows,, make bigger parts twine and solved, improved the efficient of moulding by emulation because forming process has reasonably been carried out cutting apart and having disposed the emulation winding; Adopt half drum-type assembly drum and stretching machine, execution sheet etc. to make that the diameter when body cord is fitted can be bigger than wire loop diameter, like this with the body cord of same density, can be so that the intensity of tire increases, can avoid to increase the density of cord like this, thereby calendering causes difficult problem to steel wire for the intensity that satisfies tire; Diameter when fitting owing to body cord simultaneously can be bigger than wire loop diameter, thereby make that more oversize tyre can be produced smoothly; Twine with emulation, the adhesive tape of being twined realizes fitting under the temperature condition with higher, and the contact of the interface between the parts is good like this, has eliminated the once-through method moulding process and has caused the problem of potential risk for the tire inherent quality.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is one section matrix body tube composite members of the present invention sectional schematic diagram.
Fig. 2 is two sections composite members sectional schematic diagrams of the present invention.
Fig. 3 is a fetus sectional schematic diagram of the present invention.
The specific embodiment
Embodiment 1:
Engineering radial tyre blank sectional forming technology of the present invention is that the forming process of engineering radial tyre blank has been carried out courageously and rationally splitting, make the moulding of engineering radial tyre blank finish by three phases, i.e. three sections moulding, employed concrete equipment in three sections forming processes, as: the emulation wrapping machine, flat drum, half drum-type assembly drum, clamper, clamp ring, stretching machine, reverse-wrapped capsule, belt drum, the structure structure of setting drum is as well known to those skilled in the art, employed concrete grammar in three sections forming processes, as: emulation is twined, gastight adhesive, carcass is fitted, carcass refers to that row just wraps, the button circle, the pressing of glue core, the tire shoulder pad twines, the operation of carcass anti-package also is as well known to those skilled in the art.The present invention has adopted three sections, seven drum-type moulding, and has disposed four emulation wrapping machines and carried out.
The concrete forming process of engineering radial tyre blank moulding process of the present invention is as follows:
One section: the emulation of adopting the flat drum of diameter continuously adjustable to carry out gastight adhesive, carcass applying and adhesive glue is twined, and finally forms one section matrix body tube composite members (as shown in Figure 1), and the course of work is:
At first flat drum diameter is adjusted to working diameter, carrying out gastight adhesive fits, compacting is handled at the butt joint position after fitting, flat then drum diameter is adjusted to coiling diameter, carrying out adhesive glue emulation by the emulation wrapping machine twines, after finishing the adhesive glue winding, carrying out carcass fits, and the carcass joint sewed up processing, and then carry out adhesive glue by the emulation wrapping machine and twine, with pressure roller one section composite members is carried out roll-in and made centre mark at last, finally finish one section matrix body tube composite members and fit, one section matrix body tube composite members is unloaded from flat drum by one section transmission ring.
Two sections: because the matrix body tube composite members speed of being produced in one section process is very fast, two identical devices have been equipped with in two sections, two same segment of executed in parallel, in two segmentations, adopted two broad-adjustable half drum-type assembly drums to finish the forming operation of two sections composite members jointly altogether, thereby improved the operating efficiency of a section and whole fetus moulding, the course of work of two segmentations is in two sections
At first on the stretching machine that transmission ring by a section or clamper are transported to one section matrix body tube composite members two sections, two sections stretching machines enlarge one section matrix body tube composite members, by the granny rag ring one section matrix body tube composite members is accurately moved on the half drum-type assembly drum, this moment, positive Bao Zhihang sheet opened as umbrella, positive Bao Zhihang sheet draws under cylinder action, one section overhanging matrix body tube composite members is packed tightly on the end of half drum-type assembly drum, finish carcass and refer to go the preface of just undertaking to perform work within a time limit and according to specifications; When just wrapping, wire loop moves to the end of half drum-type assembly drum under the drive of bead ring, make wire loop be enclosed within the desired location of one section matrix body tube composite members, thereby finish button circle operation, bead ring resets and gets back to desired location, and carry out the pressing of glue core by pressure roller, carry out shoulder wedge by the emulation wrapping machine then and twine; After finishing above-mentioned two procedures, cylinder strengthens aeration quantity and makes swollen the rising of reverse-wrapped capsule inflation, the reverse-wrapped capsule of positive Bao Zhihang sheet pushing inflation is finished anti-package, respectively anti-package carcass, rim of the mouth type glue is carried out anti-package and roll-in by reverse-wrapped capsule and pressure roller in this process; Carry out the sidewall by the emulation wrapping machine once more at last and twine the moulding (see figure 2) of finishing two sections composite members, two sections composite members are unloaded from half drum-type assembly drum, deposit by suspender.
Three sections: be divided into belt side and two parts of typing side, finally finish the moulding of fetus in the typing side.
Belt side: adopt two belt drums to finish belt (two-layer, three layers or more multi-layered) to fit and be compounded to form the belt composite members in order to raise the efficiency and to be convenient to change specification with tyre surface primer or transition film according to the production characteristics of engineering radial tire, two belt drums that adopt in this operation can be same specification, also can select one of them belt drum in process of production for two kinds of specifications.The work engineering is:
The laminating drum diameter is adjusted to working diameter, carries out the applying and the butt joint of ground floor belt and handles, and carries out then that second layer belt is fitted and butt joint is handled, carry out successively the 3rd or more multi-layered belt fit; After fitting and to finish, belt carries out that tyre surface primer or transition film are fitted and butt joint is handled; Finish all backs of fitting and carry out the roll-in of belt fitting part and make centre mark, finally finish the belt composite members by pressure roller.Unload the belt composite members by the belt transmission ring with the clamping of belt composite members and from belt drum then.
Typing side: adopt two rotatable setting drums, by suspender two sections composite members are installed on the setting drum, by the belt transmission ring belt composite members is delivered to setting drum center and two sections composite members assemblings, typing then is by pressure roller roll-in belt composite members; After the roll-in setting drum is rotated to tyre surface and twine station, carry out tyre surface by the emulation wrapping machine and twine, finally finish the fetus forming process of (as shown in Figure 3).Unload from setting drum by the fetus of suspender, deposit forming.Emulation of the present invention is wrapped in the emulation winding process, and the adhesive tape of winding is to realize fitting under the situation of 50 ℃~70 ℃ of temperature.
Three sections moulding process of engineering radial tire of the present invention make bigger parts twine by emulation and are solved because forming process has reasonably been carried out cutting apart and having disposed the emulation winding, improved the efficient of moulding; Sectional forming technological forming 23.5R25 fetus, the output of per tour will reach 35~40.
Embodiment 2:
Be made up of a segmentation for two sections in the present embodiment, only adopt broad-adjustable half a drum-type assembly drum to finish the forming operation of two sections composite members in this segmentation, in addition other operating procedure and embodiment 1 are identical, no longer are repeated in this description here.
Embodiment 3:
Present embodiment adopts laminating type to replace emulation and twines, and concrete forming process is as follows:
One section: adopt the flat drum of diameter continuously adjustable to carry out gastight adhesive, carcass applying and adhesive glue and fit, finally form one section matrix body tube composite members (as shown in Figure 1), the course of work is:
At first flat drum diameter is adjusted to working diameter, carrying out gastight adhesive fits, compacting is handled at the butt joint position after fitting, flat then drum diameter is adjusted to the applying diameter, carcass is carried out adhesive glue fit, and the carcass joint is sewed up processing, and then carcass is carried out adhesive glue fit, with pressure roller one section composite members is carried out roll-in and made centre mark at last, finally finish one section matrix body tube composite members and fit, one section matrix body tube composite members is unloaded from flat drum by one section transmission ring.
Two sections: because the matrix body tube composite members speed of being produced in one section process is very fast, two identical devices have been equipped with in two sections, two same segment of executed in parallel, in two segmentations, adopted two broad-adjustable half drum-type assembly drums to finish the forming operation of two sections composite members jointly altogether, thereby improved the operating efficiency of a section and whole fetus moulding, the course of work of two segmentations is in two sections
At first on the stretching machine that transmission ring by a section or clamper are transported to one section matrix body tube composite members two sections, two sections stretching machines enlarge one section carcass letter composite members, by the granny rag ring one section matrix body tube composite members is accurately moved on the half drum-type assembly drum, this moment, positive Bao Zhihang sheet opened as umbrella, positive Bao Zhihang sheet draws under cylinder action, one section overhanging matrix body tube composite members is packed tightly on the end of half drum-type assembly drum, finish carcass and refer to go the preface of just undertaking to perform work within a time limit and according to specifications; When just wrapping, wire loop moves to the end of half drum-type assembly drum under the drive of bead ring, make wire loop be enclosed within the desired location of one section matrix body tube composite members, thereby finish button circle operation, bead ring resets and gets back to desired location, and carry out the pressing of glue core by pressure roller, carry out shoulder wedge then and fit; After finishing above-mentioned two procedures, cylinder strengthens aeration quantity and makes swollen the rising of reverse-wrapped capsule inflation, the reverse-wrapped capsule of positive Bao Zhihang sheet pushing inflation is finished anti-package, respectively anti-package carcass, rim of the mouth type glue is carried out anti-package and roll-in by reverse-wrapped capsule and pressure roller in this process; Last carry out once more fitting in the sidewall and the moulding (see figure 2) of finishing two sections composite members unloads two sections composite members by suspender from half drum-type assembly drum, deposit.
Three sections: be divided into belt side and two parts of typing side, finally finish the moulding of fetus in the typing side.
Belt side: adopt two belt drums to finish belt (two-layer, three layers or more multi-layered) to fit and be compounded to form the belt composite members in order to raise the efficiency and to be convenient to change specification with tyre surface primer or transition film according to the production characteristics of engineering radial tire, two belt drums that adopt in this operation can be same specification, also can select one of them belt drum in process of production for two kinds of specifications.The work engineering is:
The laminating drum diameter is adjusted to working diameter, carries out the applying and the butt joint of ground floor belt and handles, and carries out then that second layer belt is fitted and butt joint is handled, carry out successively the 3rd or more multi-layered belt fit; After fitting and to finish, belt carries out that tyre surface primer or transition film are fitted and butt joint is handled; Finish all backs of fitting and carry out the roll-in of belt fitting part and make centre mark, finally finish the belt composite members by pressure roller.Unload the belt composite members by the belt transmission ring with the clamping of belt composite members and from belt drum then.
Typing side: adopt two rotatable setting drums, by suspender two sections composite members are installed on the setting drum, by the belt transmission ring belt composite members is delivered to setting drum center and two sections composite members assemblings, typing then is by pressure roller roll-in belt composite members; After the roll-in setting drum is rotated to tyre surface applying station, carry out tyre surface and fit, finally finish the fetus forming process of (as shown in Figure 3).Unload from setting drum by the fetus of suspender, deposit forming.In the applying process of the present invention, the adhesive tape of applying is to realize fitting under the situation of 50 ℃~70 ℃ of temperature.
Claims (10)
1, a kind of forming method of engineered meridian tyre blank is characterized in that comprising the following steps:
One section: the emulation of adopting the flat drum of diameter continuously adjustable to carry out gastight adhesive, carcass applying and adhesive glue is twined, and finally forms one section matrix body tube composite members;
Two sections: form by a segmentation for two sections, the course of work of this segmentation is, at first transmission ring or the clamper by a section is transported to one section matrix body tube composite members on the stretching machine, stretching machine enlarges one section matrix body tube composite members, by the granny rag ring matrix body tube composite members is moved on the broad-adjustable half drum-type assembly drum, carry out again carrying out the pressing of glue core by pressure roller after carcass refers to that row just wraps, detains circle; Carrying out shoulder wedge by the emulation wrapping machine then twines; Respectively anti-package carcass, rim of the mouth type glue are carried out anti-package and roll-in by reverse-wrapped capsule and pressure roller; Carry out the sidewall by the emulation wrapping machine once more at last and twine the moulding of finishing two sections composite members, and two sections composite members are unloaded from half drum-type assembly drum;
Three sections: be divided into belt side and two parts of typing side, finally finish the moulding of fetus in the typing side:
Belt side: adopt and to utilize belt drum to finish belt (two-layer, three layers or more multi-layered) to fit and be compounded to form the belt composite members with tyre surface primer or transition film;
The typing side: by suspender two sections composite members are installed on the setting drum, by the belt transmission ring belt composite members are delivered to a non-rotary bulging center and two sections composite members assemblings, typing then is by pressure roller roll-in belt composite members; After the roll-in setting drum is rotated to tyre surface and twine station, carry out tyre surface by the emulation wrapping machine and twine, finally finish the forming process of fetus, and the fetus of forming is unloaded from setting drum.
2,, it is characterized in that said two sections can also be made up of two parallel identical segmentations according to the forming method of the described engineered meridian tyre blank of claim 1.
3,, it is characterized in that the emulation winding also can adopt the adhesive glue card to close in said one section according to the forming method of the described engineered meridian tyre blank of claim 1.
4,, it is characterized in that carrying out shoulder wedge by the emulation wrapping machine in said two sections twines and can also fit for carrying out shoulder wedge according to the forming method of claim 1,2 described engineered meridian tyre blanks.
5,, it is characterized in that carrying out the sidewall by the emulation wrapping machine in said two sections twines and can also fit for carrying out the sidewall according to the forming method of claim 1,2 described engineered meridian tyre blanks.
6,, it is characterized in that the quantity of setting drum in said three sections belt sides can be one or two according to the forming method of the described engineered meridian tyre blank of claim 1.
7,, it is characterized in that setting drum is fixed or is rotary type in said three sections belt sides according to the forming method of claim 1,6 described engineered meridian tyre blanks.
8,, it is characterized in that carrying out tyre surface by the emulation wrapping machine in said three sections typing sides twines and can also fit for carrying out the tyre surface piecemeal according to the forming method of the described engineered meridian tyre blank of claim 1.
9,, it is characterized in that saidly in three sections belt side, adopting two belt drums in order to raise the efficiency and to be convenient to change specification according to the production characteristics of engineering radial tire according to the forming method of the described engineered meridian tyre blank of claim 1.
10,, it is characterized in that the adhesive tape of twining in the said emulation winding process is to realize fitting under the situation of 50 ℃~70 ℃ of temperature according to the forming method of the described engineered meridian tyre blank of claim 1.
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CNB2005100445646A CN1323828C (en) | 2005-09-08 | 2005-09-08 | Engineered meridian tyre blank molding method |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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CN100413677C (en) * | 2006-08-22 | 2008-08-27 | 三角轮胎股份有限公司 | Preparing molding technique for engineering meridian tyre with flexible production-line |
CN101625557B (en) * | 2009-08-03 | 2011-08-17 | 广州华工百川科技股份有限公司 | Controlling method for wrapping surface of tire |
CN102294834A (en) * | 2011-08-11 | 2011-12-28 | 三角(威海)华盛轮胎有限公司 | Three dimensional winding method of meridian tyre for engineering |
CN101554782B (en) * | 2008-04-11 | 2012-06-06 | 株式会社宇星机工 | Rotating press type greentire manufacturing apparatus |
CN106003776A (en) * | 2016-05-17 | 2016-10-12 | 江苏通用科技股份有限公司 | Tire building process |
CN111703098A (en) * | 2020-07-06 | 2020-09-25 | 贵州轮胎股份有限公司 | Double-steel-wire-ring semi-steel radial tire molding process and production line |
CN113119663A (en) * | 2021-04-19 | 2021-07-16 | 徐州工业职业技术学院 | Manufacturing method of bulletproof and explosion-proof tubeless tire |
CN116278092A (en) * | 2023-05-17 | 2023-06-23 | 广饶县计量测试检定所(广饶县产品质量检验所、广饶县橡胶轮胎产品与材料质量检验中心) | Method for improving engineering radial tire bead durability |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2781412A1 (en) * | 1998-07-23 | 2000-01-28 | Michelin Soc Tech | PROCESS FOR THE MANUFACTURE OF TIRES |
RU2232075C2 (en) * | 1998-12-23 | 2004-07-10 | Пирелли Пнеуматичи С.П.А. | The method of manufacture of the carcasses for tiers and a carcass produced by this method |
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2005
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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CN100413677C (en) * | 2006-08-22 | 2008-08-27 | 三角轮胎股份有限公司 | Preparing molding technique for engineering meridian tyre with flexible production-line |
CN101554782B (en) * | 2008-04-11 | 2012-06-06 | 株式会社宇星机工 | Rotating press type greentire manufacturing apparatus |
CN101625557B (en) * | 2009-08-03 | 2011-08-17 | 广州华工百川科技股份有限公司 | Controlling method for wrapping surface of tire |
CN102294834A (en) * | 2011-08-11 | 2011-12-28 | 三角(威海)华盛轮胎有限公司 | Three dimensional winding method of meridian tyre for engineering |
CN102294834B (en) * | 2011-08-11 | 2013-10-23 | 三角(威海)华盛轮胎有限公司 | Three dimensional winding method of meridian tyre for engineering |
CN106003776A (en) * | 2016-05-17 | 2016-10-12 | 江苏通用科技股份有限公司 | Tire building process |
CN106003776B (en) * | 2016-05-17 | 2018-08-10 | 江苏通用科技股份有限公司 | The moulding process of tire |
CN111703098A (en) * | 2020-07-06 | 2020-09-25 | 贵州轮胎股份有限公司 | Double-steel-wire-ring semi-steel radial tire molding process and production line |
CN113119663A (en) * | 2021-04-19 | 2021-07-16 | 徐州工业职业技术学院 | Manufacturing method of bulletproof and explosion-proof tubeless tire |
CN116278092A (en) * | 2023-05-17 | 2023-06-23 | 广饶县计量测试检定所(广饶县产品质量检验所、广饶县橡胶轮胎产品与材料质量检验中心) | Method for improving engineering radial tire bead durability |
CN116278092B (en) * | 2023-05-17 | 2023-08-01 | 广饶县计量测试检定所(广饶县产品质量检验所、广饶县橡胶轮胎产品与材料质量检验中心) | Method for improving engineering radial tire bead durability |
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