CN113641942A - Method for solving bending of TBR tire cord - Google Patents
Method for solving bending of TBR tire cord Download PDFInfo
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- CN113641942A CN113641942A CN202110916782.3A CN202110916782A CN113641942A CN 113641942 A CN113641942 A CN 113641942A CN 202110916782 A CN202110916782 A CN 202110916782A CN 113641942 A CN113641942 A CN 113641942A
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- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000005452 bending Methods 0.000 title claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 239000011324 bead Substances 0.000 claims description 20
- 230000007547 defect Effects 0.000 claims description 7
- 239000000047 product Substances 0.000 claims description 7
- 239000004677 Nylon Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 239000011265 semifinished product Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims 1
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- 238000004364 calculation method Methods 0.000 description 43
- 238000001514 detection method Methods 0.000 description 13
- 238000013461 design Methods 0.000 description 4
- 238000004073 vulcanization Methods 0.000 description 3
- 238000012797 qualification Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 206010028347 Muscle twitching Diseases 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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Abstract
The invention relates to a method for solving the problem of bending of a TBR tire cord, which belongs to the technical field of tire production, wherein the process flattening width is determined according to a tire cord stretching rate formula, and the shape of a sector block and the position of a steel wire ring on the sector block are determined according to the process flattening width.
Description
Technical Field
The invention belongs to the technical field of tire production, and particularly relates to a method for solving the problem of bending of a TBR tire cord.
Background
Because the load of the all-steel radial (TBR) tire is large, the damage phenomena of the shoulder part and the bead position of the tire are frequent, the tire of a transport vehicle in China is usually used under abnormal conditions of overload, high air pressure, unbalance loading and the like, the outline deformation of the tire is increased, and the early damage phenomena of the tire shoulder and the part around the bead (the tire bead part for short) are easy to occur, so that the problem of the durability damage of the tire is the core technical problem to be solved urgently by enterprises.
The bending of the tire body cord is a quality defect which is easy to appear in the production process of the TBR tire, and is one of main factors influencing the qualification rate of finished products, particularly the X-ray detection qualification rate, and the bending of the cord is determined by the elongation rate of the tire body cord. When the tire is used, the tire body cord is too straight, and the tire body cord is too stretched, so that the defects of exposed steel wires in the tire, exposed steel wires at bead openings and the like are easily caused. The bending degree of the tire body cord is too large, and the stretching of the tire body cord is too small, so that the tire body cord is easy to get out of the defects of steel wire bending and the like.
Disclosure of Invention
The inventor summarizes in long-term practice: the bending of the tire cord is related to two factors, namely structural parameter influence, such as flat and wide process, and process fluctuation influence, such as the shape of a sector, the position of a steel wire ring falling on the sector and vulcanization shaping pressure, so that the root cause cannot be immediately judged when the bending problem of the tire cord occurs. At present, the most effective method for solving the bending problem of the tire cord is to repeatedly adjust structural parameters, namely, the leveling width according to empirical values, and the reason for the repeated adjustment is mainly that the tire cord elongation rate formula is not accurate.
In order to solve the above problems, a method for solving the cord bending of the TBR tire has been proposed.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of accounting for TBR tire cord buckling comprising the steps of:
s100, determining the process flatness and width according to a carcass cord elongation rate formula;
the formula of the elongation of the tire body cord is as follows: s ═ 2ab- (P-2w.t1) ]/(P-2w.t1), and w.t1 ═ k W.t, where S is the carcass cord elongation, 2ab is the distance between the inner ends of the individual cords of the finished tire section, P is the process flatness, w.t1 is the bead width of the finished product, W.t is the bead width of the semi-finished product, and k represents the correction factor;
and step S200, determining the shape of the sector block and the position of the steel wire ring on the sector block according to the process flat width.
Further, the too large S value is easy to cause defects such as tire liner exposed steel wires, bead exposed steel wires and the like, and the too small S value is easy to cause defects such as tire body steel wire bending and the like, so that S belongs to [ 1.2%, 2% ].
Further, k is k1/k2, k1 is the finished bead width, and k2 is the semi-finished bead width.
Further, k1 is obtained by section measurement, and each specification tire takes at least 2 sections, and at least 4 finished bead widths are measured and averaged.
Further, k2 was obtained from a tire construction table query, and k2 included the width of the nylon wrap.
Preferably, k is 0.97 for tubed tires and 0.94 for tubeless tires.
Further, according to a tire forming operation manual and an industrial standard, fan-shaped block shapes are selected according to tire specifications, different fan-shaped block shapes correspond to different process flat widths, different fan-shaped block shapes correspond to different forming drum widths, positions of the steel wire rings falling on the fan-shaped blocks are different when the forming drum widths are different, and the adopted fan-shaped block shapes and the forming drum widths need to ensure that the turn-up height of the tire body of the finished section is the same as a design value.
Further, for the 255/70R22.5 specification tire, k is 0.94 and the process average width is 527- & 531 mm.
Further, for the 305/70R22.5 specification tire, k is 0.94, and the process average width is 631 and 636 mm.
Further, for the tire with the 9R22.5 specification, k is 0.94, and the process flat width is 521-525 mm.
Further, for the 8.25R20 standard tire, k is 0.97, and the craft flat width is 555-.
The invention has the beneficial effects that:
1. by improving the formula of the elongation rate of the tire cord, the flatness and the width of the process can be accurately calculated, the calculation result is matched with the actual X-ray detection result, and the method can be applied to actual work.
2. The reason is generated by analyzing the design mechanism, and the calculation method is standardized, and corresponding calculation adjustment is made according to different tire specifications.
3. The twitching amount of the tire body in the molding process is ensured through accurate calculation, the shape of the sector block and the position of the steel wire ring falling on the sector block are determined, and the problems of U explosion and lateral falling are effectively avoided.
4. The blank that the elongation of the tire cord of the tire body does not form a standard calculation method is filled, and the curvature of the tire cord is effectively controlled.
5. The improved carcass cord elongation formula can quickly judge whether the bending of the carcass cord is a structural parameter problem or a process problem in actual use, quickly find out the root cause of the problem, avoid repeatedly adjusting the flatness and width of the process according to empirical values, and improve the working efficiency.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following description is provided clearly and completely, and other similar embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application based on the embodiments in the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are merely directions of reference, and thus, the directional terms used are intended to illustrate rather than limit the present invention.
The first embodiment is as follows:
a method of accounting for TBR tire cord buckling comprising the steps of:
s100, determining the process flatness and width according to a carcass cord elongation rate formula;
the formula of the elongation of the tire body cord is as follows: and S ═ 2ab- (P-2W.t1) ]/(P-2W.t1), wherein S is the tensile rate of the tire body cord, 2ab is the distance between the inner end points of the single cord of the finished tire section, P is the process flat width, and W.t1 is the width of the steel wire ring of the finished product. The too large S value is easy to expose steel wires in the tire, expose steel wires at the seam allowance and the like, the too small S value is easy to expose steel wires of the tire body and the like, and the preferable S belongs to 1.2 percent and 2 percent.
The stretching rate formula of the carcass cord can be converted to calculate the average width P & lt 2ab/(1+ S) +2 & lt 2 & gtW.t1. in the forming process, after the sector block is supported, the steel wire ring is extruded by vulcanization shaping internal pressure, and the vulcanization high temperature causes the nylon wrapping cloth of the steel wire ring to be heated and shrunk, so that the width of the steel wire ring is reduced, the width of the steel wire ring is irreversibly changed in the process from a semi-finished product to a finished product, namely, the width of the vulcanized finished steel wire ring has a certain shrinkage rate, therefore, W.t1 & lt k & gt W.t, W.t is the width of the steel wire ring of the semi-finished product, and k represents a correction coefficient. Specifically, k is k1/k2, k1 is the finished bead width, and k2 is the semi-finished bead width. k1 is obtained by section measurement, at least 2 sections are taken for each specification of tyre, and at least 4 finished steel wire ring widths are measured and averaged. k2 was obtained from a tire construction chart query, k2 included the width of the nylon wrap. Preferably, k is 0.97 for inner tube products and 0.94 for tubeless products.
And step S200, determining the shape of the sector block and the position of the steel wire ring on the sector block according to the process flat width.
Specifically, according to a tire forming operation manual and an industrial standard, fan-shaped block shapes are selected according to tire specifications, different fan-shaped block shapes correspond to different process flat widths, different fan-shaped block shapes correspond to different forming drum widths, and specifically, a calculation method of drum width of a heavy-load all-steel radial tire forming drum can be referred to CN 201910921858.4. When the width of the forming drum is different, the positions of the steel wire rings on the sector blocks are different, and the shape of the sector blocks and the width of the forming drum are adopted to ensure that the turn-up height of the carcass of the finished section is the same as the design value.
Correspondingly, in practical application, when the tire body cord is bent, the tensile rate of the tire body cord is firstly calculated, whether the process flattening is correct or not is determined, and if the process flattening is proper, whether the process is caused by process reasons such as the position reason of the steel ring falling on the sector block, the pressure of the formed sector block and the like is investigated. That is to say, when the bending degree of the tire body cord is unqualified, the structural problem is firstly eliminated, the unqualified reason is qualified to the process problem, the repeated debugging of workers is avoided, and the working efficiency is improved.
The existing calculation formula of the carcass elongation is S ═ 2ab- (P-2W.t) ]/(P-2W.t), wherein S is the carcass cord elongation, S ∈ [ 1.2%, 2% ], 2ab is the distance between inner end points of a single cord of a finished tire section, P is the process flat width, and W.t is the bead width. After setting the carcass stretch ratio value, this equation can be converted to calculate the mean width: p ═ 2ab/(1+ S) +2 × W.t. Some data show W.t for the formed statistical bead width and some data show W.t for the semi-finished width. However, no matter how W.t takes values, the obtained calculation result has a certain difference from the detection result, for example, the elongation of the carcass cord is within the design range, but the X-ray detection shows that the carcass cord is severely bent. Therefore, the existing formula is not applied to actual production, and an operator adjusts the process flatness and width only by virtue of empirical values.
For a tire of specification 255/70R 22.5: when the process flatness is 532mm, the elongation of the carcass cord is 1.31 percent and the elongation of the cord is qualified by calculation according to the existing formula. However, X-ray detection shows that the bending of the carcass cord reaches 5 and a half, and the cord bending is unqualified. The conclusion is that the cord calculation corresponds to a non-conformity with the actual cord bending.
In general, the factory adjusts the process flatness based on the bending of the cord detected by the X-ray. The adjustment experience is as follows: 1. straightening the cord: and the inner liner is thinned, the stretching of the tire body cord is too large, and the flat width needs to be increased. 2. And bending the cord more than 5, judging that the cord is unqualified in bending, and excessively stretching the carcass cord, so that the flat width needs to be reduced. Such as analysis and solution of the bending reason of the shoulder cord of the all-steel truck radial tire (Zhou Tian Ming). The adjustment of the flatness and the width is adjusted according to the empirical value, the problem often appears repeatedly, and the reason for the problem is that the root cause of the problem is not found.
For the tire of 255/70R22.5 specification, after the process flat width is adjusted from 532mm to 528mm, the existing formula is used for calculation and display that the elongation of the carcass cord is 2.09%, and the elongation of the carcass cord is unqualified, but the actual X-ray detection shows that 2 cords are bent, which belongs to the normal condition, and the specific data is shown in Table 1:
table 1:
the calculation result is qualified by using the existing formula, but the bending of the carcass cord actually occurs, not only occurs in the 255/70R22.5 specification, but also occurs in other specifications, so that the existing carcass elongation calculation formula is not applied in actual work.
For the 255/70R22.5 tire, k is 0.94, and the calculation results using the formula disclosed in the present invention are shown in table 2.
Table 2:
as can be seen from table 2: the original carcass elongation is 0.94 percent and is less than the standard that the minimum elongation is 1.2 percent. After adjustment, the elongation of the tire body cord is 1.72%, the calculation range (1.2-2%) of the elongation of the tire body is met, the flatness and the width of the process can be accurately determined through adjustment calculation, the calculation result is matched with the actual X-ray detection display, and the calculation formula disclosed by the invention can be applied to actual work. Meanwhile, for the tire of specification 255/70R22.5, the process flat width is 527- & ltSUB & gt 531mm within the calculation range of the carcass elongation.
Example two:
parts of this embodiment that are the same as those of the first embodiment are not described again, except that:
for the 305/70R22.5 tire, k is 0.94, and the calculation results using the conventional formula are shown in table 3, and the calculation results using the formula disclosed in the present invention are shown in table 4.
Table 3:
as can be seen from table 3: the calculation result of the existing formula is not matched with the actual X-ray detection display, so that the existing formula for calculating the carcass elongation is not applied in the actual work.
Table 4:
as can be seen from table 4: the original carcass elongation is 0.89 percent and is less than the standard of the minimum elongation of 1.2 percent. After adjustment, the elongation of the tire body cord is 1.57%, the calculation range (1.2-2%) of the elongation of the tire body is met, the flatness and the width of the process can be accurately determined through adjustment calculation, the calculation result is matched with the actual X-ray detection display, and the calculation formula disclosed by the invention can be applied to actual work. Meanwhile, for the tire of 305/70R22.5 specification, the process flat width is 631-636mm within the calculation range of the carcass elongation.
Example three:
parts of this embodiment that are the same as those of the first embodiment are not described again, except that:
for the tire of the 9R22.5 standard, k is 0.94, and the calculation results using the conventional formula are shown in table 5, and the calculation results using the formula disclosed in the present invention are shown in table 6.
Table 5:
as can be seen from table 5: the calculation result of the existing formula is not matched with the actual X-ray detection display, so that the existing formula for calculating the carcass elongation is not applied in the actual work.
Table 6:
as can be seen from table 6: the original carcass elongation is 0.84 percent and is less than the standard that the minimum elongation is 1.2 percent. After adjustment, the elongation of the tire body cord is 1.66%, the calculation range (1.2-2%) of the elongation of the tire body is met, the flatness and the width of the process can be accurately determined through adjustment calculation, the calculation result is matched with the actual X-ray detection display, and the calculation formula disclosed by the invention can be applied to actual work. Meanwhile, for the tire with the 9R22.5 specification, the process flat width is 521-525mm in the calculation range of the elongation rate of the tire body.
Example four:
parts of this embodiment that are the same as those of the first embodiment are not described again, except that:
for the 8.25R20 standard tire, k is 0.97, and the calculation results using the conventional formula are shown in table 7, and the calculation results using the formula disclosed in the present invention are shown in table 8.
Table 7:
as can be seen from table 7: the calculation result of the existing formula is not matched with the actual X-ray detection display, so that the existing formula for calculating the carcass elongation is not applied in the actual work.
Table 8:
as can be seen from table 8: the original carcass elongation rate is 1.13 percent and is less than the standard of the minimum elongation rate of 1.2 percent. After adjustment, the elongation of the tire body cord is 1.51%, the calculation range (1.2-2%) of the elongation of the tire body is met, the flatness and the width of the process can be accurately determined through adjustment calculation, the calculation result is matched with the actual X-ray detection display, and the calculation formula disclosed by the invention can be applied to actual work. Meanwhile, for the tire with the 8.25R20 specification, the process flat width is 555-559mm in the calculation range of the elongation rate of the tire body.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (10)
1. A method of resolving the problem of cord buckling in a TBR tire comprising the steps of:
s100, determining the process flatness and width according to a carcass cord elongation rate formula;
the formula of the elongation of the tire body cord is as follows: s ═ 2ab- (P-2w.t1) ]/(P-2w.t1), and w.t1 ═ k W.t, where S is the carcass cord elongation, 2ab is the distance between the inner ends of the individual cords of the finished tire section, P is the process flatness, w.t1 is the bead width of the finished product, W.t is the bead width of the semi-finished product, and k represents the correction factor;
and step S200, determining the shape of the sector block and the position of the steel wire ring on the sector block according to the process flat width.
2. The method for solving the bending problem of the TBR tire cord as claimed in claim 1, wherein S value is too large, the defects of steel wire exposed in the tire tube and steel wire exposed at the bead are easy to occur, S value is too small, the defect of steel wire bending of the tire body is easy to occur, and S belongs to [ 1.2%, 2% ].
3. The method of solving the problem of cord bending in a TBR tire according to claim 1 wherein k is k1/k2, k1 is the finished bead width and k2 is the semi-finished bead width.
4. A method of resolving cord camber in a TBR tire as in claim 3 wherein k1 is obtained by taking a cross-section measurement, taking at least 2 cross-sections per gauge tire, taking an average of at least 4 finished bead widths.
5. The method for solving the problem of bending of the TBR tire cord as claimed in claim 4, wherein k2 is obtained from tire construction table query, and k2 comprises the width of nylon winding cloth.
6. A method of resolving cord camber in TBR tires according to claim 5, wherein k is 0.97 for tubed tires and 0.94 for tubeless tires.
7. A method of resolving cord bending for TBR tyres as claimed in any one of claims 1-6, wherein for 255/70R22.5 gauge tyre, k is 0.94 and the craft flat width is 527- > 531 mm.
8. The method for solving the problem of cord bending of the TBR tire as claimed in any one of claims 1 to 6, wherein for the 305/70R22.5 specification tire, k is 0.94 and the craft average width is 631 and 636 mm.
9. The method for solving the problem of cord bending of the TBR tire as claimed in any one of claims 1 to 6, wherein for a 9R22.5 specification tire, k is 0.94 and the craft flat width is 521-525 mm.
10. A method of resolving cord camber in a TBR tire as in any one of claims 1 to 6, wherein k is 0.97 and craft flat is 555-559mm for an 8.25R20 size tire.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114088426A (en) * | 2022-01-20 | 2022-02-25 | 山东兴达轮胎有限公司 | Detection method for reducing early lateral falling problem of rigid-block tire and tire |
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| KR20130051707A (en) * | 2011-11-10 | 2013-05-21 | 한국타이어 주식회사 | Steel carcass centering apparatus using x-ray scanner |
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2021
- 2021-08-11 CN CN202110916782.3A patent/CN113641942B/en active Active
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| US20080056446A1 (en) * | 2006-06-15 | 2008-03-06 | Yuji Tahara | Tire inspection method |
| KR20130051707A (en) * | 2011-11-10 | 2013-05-21 | 한국타이어 주식회사 | Steel carcass centering apparatus using x-ray scanner |
| CN112539944A (en) * | 2020-11-23 | 2021-03-23 | 赛轮集团股份有限公司 | Measurement control method for elongation and flexibility of carcass cord of all-steel radial tire |
| CN112721545A (en) * | 2020-12-29 | 2021-04-30 | 安徽佳通乘用子午线轮胎有限公司 | All-steel radial tire capable of improving elongation rate of tire cord |
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| Title |
|---|
| 卢青;娄盈丰;项蝉;柴德龙;: "全钢子午线轮胎成型工艺胎体平面宽度的设定", 轮胎工业, no. 05, pages 44 - 46 * |
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| CN114088426A (en) * | 2022-01-20 | 2022-02-25 | 山东兴达轮胎有限公司 | Detection method for reducing early lateral falling problem of rigid-block tire and tire |
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