CN113561545A - Improvement method for ensuring rationalization of distribution of tire bead bottom materials - Google Patents
Improvement method for ensuring rationalization of distribution of tire bead bottom materials Download PDFInfo
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- CN113561545A CN113561545A CN202110674702.8A CN202110674702A CN113561545A CN 113561545 A CN113561545 A CN 113561545A CN 202110674702 A CN202110674702 A CN 202110674702A CN 113561545 A CN113561545 A CN 113561545A
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- tire
- bead
- tire bead
- distribution
- thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
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- Tires In General (AREA)
Abstract
The invention belongs to the field of tire component production, is applied to a tire blank forming project, and particularly relates to an improvement method for ensuring the rationalization of the distribution of a tire bead bottom material, which comprises the following steps: calculating the thickness of the material at the bottom of the tire bead and the transverse material of the tire bead according to the material distribution at the opening of the tire blank; comparing the thickness of the tire bead bottom and the tire bead transverse material with the theoretical value of the distribution thickness of the finished tire material; calculating the transverse compression rate of the bead bottom and the bead; judging whether the tire bead bottom and the tire bead transverse compression rate meet the design size requirement of the tire bead part; if so, determining that the curve design of the fan-shaped block is reasonable; if not, redesigning the fan-shaped block curve. The material distribution of the tire bead part of the finished tire is reasonable, the quality problems of large line development and the like of the tire bead opening are avoided, and meanwhile, the quality problems of wire drawing, explosion and the like caused by excessive rubber storage at the bottom of the tire bead are also reduced.
Description
Technical Field
The invention belongs to the field of tire component production, is applied to a tire blank forming project, and particularly relates to an improvement method for ensuring the rationalization of the distribution of a tire bead bottom material.
Background
Tires are indispensable components for vehicles such as cars and trucks, and the performance of these vehicles is closely related to the characteristics of the tires. The bead portion of the tire member plays a role of fixing the tire to the rim, transmits driving force, braking force and rotational power in an adjusting direction from the vehicle to the ground, has a function of preventing the tire from coming off the rim, reinforces the rigidity of the sidewall portion, plays a role of acting force on the tire by deformation of the carcass, and ensures driving, braking and operating safety of the vehicle, and is an important part for safe use of the tire.
The forming engineering is a process of combining various semi-finished product components, and the bead part material of the tire comprises an inner liner, tire side wear-resistant rubber, steel wire bead wrapping cloth, a tire body and the like besides a steel wire ring. For a long time, the compression ratio of materials at the bottom of a tire bead and in the circumferential direction is a problem which is neglected, but the compression condition of the materials at the bottom of the tire bead directly influences the diameter of a tire blank opening, further influences the condition of vulcanizing and pot filling, and can cause the problems of line appearance, seam allowance large edge and the like of the finished tire bead. The tire bead circumferential material compression condition can influence the shape of a tire blank ring opening, so that excessive rubber is stored between a steel wire ring and a tire body, and the quality problems of wire drawing, explosion and the like easily occur in the use process of the tire.
Therefore, in order to ensure the reasonable distribution of the materials at the bottom and in the circumferential direction of the tire bead, the prior art method is improved, and the method has great significance for improving the appearance and the internal quality of the finished tire.
Disclosure of Invention
The invention aims to provide an improvement method for ensuring the rationalization of the distribution of materials at the bottom of a tire bead, ensure the rational distribution of materials at the bead part of a finished tire, avoid the quality problems of large edge of the bead opening and the like, and simultaneously reduce the quality problems of wire drawing, explosion and the like caused by excessive rubber storage at the bottom of the tire bead.
The present invention is achieved in such a way that,
an improved method of ensuring rationalisation of the distribution of material in the bead base of a tyre, the method comprising:
calculating the thickness of the material at the bottom of the tire bead and the transverse material of the tire bead according to the material distribution at the opening of the tire blank;
comparing the thickness of the tire bead bottom and the tire bead transverse material with the theoretical value of the finished tire material distribution thickness, wherein the compression ratio is the percentage of the difference between the theoretical value of the tire bead bottom and the tire bead transverse material thickness and the theoretical value of the finished tire material distribution thickness;
calculating the transverse compression rate of the bead bottom and the bead;
judging whether the tire bead bottom and the tire bead transverse compression rate meet the design size requirement of the tire bead part;
if so, determining that the curve design of the fan-shaped block is reasonable;
if not, redesigning the fan-shaped block curve.
Furthermore, the material distribution of the opening part of the green tyre ring comprises positioning points and sizes of all materials of the green tyre ring part.
Further, the requirements for designing and measuring the tire ring part comprise that the bottom of the tire ring and the transverse compression rate are both in the range of 12-16%.
Furthermore, each material of the bead part comprises a steel wire ring, an inner liner, a tire side, steel wire seam wrapping cloth and a tire body, and the thickness is the sum of the thickness measured values of the materials.
Further, the diameter of the green tire ring opening is 511-512 mm.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention aims at the defects of large rim of the existing finished product, line display of the bead, large glue amount between a steel wire ring and a tire body (figure 1 (a) and figure 1 (b)), combines the problems of early wire drawing and explosion and the like in the using process of the tire, determines the diameter of the rim of the bead with proper specification by comparing the outline curve and the diameter size of the bead part of the tire with various specifications (figure 2), ensures that the diameter of the rim of the bead is matched with a mold steel ring, the loading of a pot is smooth in the tire process, the rim of the bead is not scratched, and the gap between the rim of the bead and the mold steel ring is matched, so that the problems of line display of the rim of the bead, large rim, narrow rim and the like do not occur.
2. According to the invention, the proper compression ratio of the material at the tire bead part of the tire blank is determined through the distribution of the tire design material (figure 4), and the design of the sector fixture is used for ensuring that the material distribution at the bead opening part of the finished tire meets the design requirement.
3. According to the invention, the matched segment curve is determined by calculating the proper compression ratio of the tire bead part of the tire blank, so that the problem of poor matching degree of the original segment is solved.
Drawings
FIG. 1 shows the present situation of bead rim line development and CTL, where there is a slight edge emergence at the corresponding position of the bead line development, and there is a significant problem of excessive glue storage between the bead ring at the bottom of the corresponding CTL bead and the tire body.
Fig. 2 is an outline curve of a tire bead portion: taking the specification of 9.00R20/10.00R20 as an example, the bead opening diameter is 511 mm.
FIG. 3 is a diagram of theoretical material distribution of a finished bead: the material of the tire bead part of the tire is theoretically distributed, the glue storage amount between the steel wire ring and the tire body is reasonable, and the thickness of the wear-resistant glue at the bottom of the tire bead is more than 1.5 mm;
FIG. 4 shows the matching condition (c) between the existing sector curve (a) and the designed sector curve (b) and the bead opening of the green tire; when the sector curve is too narrow, the extrusion of the two sides of the opening of the tire blank ring is too large, and the bottom of the tire bead of the tire blank cannot contact the sector, so that the problem of extrusion is solved, and the diameter of the opening of the tire blank ring is finally too small. On the contrary, although the bottom of the tire bead of the tire blank can contact the fan-shaped block, the width is too wide, so that the materials on two sides of the tire bead are not compressed, and meanwhile, the quality problems of unreasonable material distribution, wire drawing explosion and the like in the use process of a finished tire can occur.
FIG. 5 shows the improved bead opening condition;
FIG. 6 is an improved cross-section;
FIG. 7 is a schematic view of green tire application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention analyzes the matching between the outer contour diameter (figure 2) of the tire bead of the prior tire and the diameter of the tire blank to determine the proper diameter of the tire bead opening.
Sector curve shape: at present, for each tire manufacturer, the research on the curve shape of the sector block is in a blank state, and the size of the sector block is subject to the size provided by each building drum manufacturer. With the refinement of the structure of each specification series product, the conventional universal sector curve is difficult to meet the requirements of the conventional product, the compression ratio of each series product is determined by theory, and the curve is reversely pushed to the shape of the sector curve according to the distribution diagram of the finished tire material and the compression ratio, which is the key point of the invention.
Influence of the shape of the curve of the sector on the material of the bead opening of the green tire: the narrow curve of the sector block can cause that the bottom of the tire bead of the tire blank can not contact with the sector block, the bottom material is not extruded, and meanwhile, the materials on two sides are seriously extruded, which can cause that the diameter of the opening of the tire bead is small (only 506mm, 5mm smaller than the diameter 511mm of the mold steel ring and the opening of the tire bead is arc-shaped).
Calculating the thickness of the material at the bottom of the tire bead and the transverse material of the tire bead according to the material distribution at the opening of the tire blank;
comparing the thickness of the tire bead bottom and the tire bead transverse material with the theoretical value of the distribution thickness of the finished tire material;
calculating the transverse compression rate of the bead bottom and the bead; wherein the compression ratio is the percentage of the difference between the theoretical values of the thickness of the bottom and the transverse material of the tire bead of the tire blank and the distribution thickness of the finished tire material and the theoretical value of the distribution thickness of the finished tire material;
judging whether the tire bead bottom and the tire bead transverse compression rate meet the design size requirement of the tire bead part;
if so, determining that the curve design of the fan-shaped block is reasonable;
if not, redesigning the fan-shaped block curve.
According to the distribution condition of the material of the tire bead opening, the material of the tire bead opening mainly comprises a steel wire ring, an inner liner, a tire side, a steel wire bead opening wrapping cloth and a tire body (see figure 7), the thickness of the tire bead bottom and the tire bead transverse material (the sum of the thickness measured values of all the materials) is calculated, the thickness is compared with the material distribution diagram (see figure 3) of the finished tire (the ratio of the theoretical value of the thickness of the finished tire to the thickness measured value of the tire bead), the proper compression ratio (12-16%) is determined, and the optimal value range of the design requirement is ensured.
According to the distribution condition of the material at the opening of the tire bead, including the positioning points, the size conditions and the compression ratio conditions of all materials of the tire bead, the defects of original fan-shaped blocks are analyzed, and a novel fan-shaped block curve is designed, wherein the design principle of the novel fan-shaped block is to ensure that the bottom of the tire bead and the transverse compression ratio are both 12-16%, so that the design size requirement of the tire bead is met, and the distribution requirement of the final finished tire material is met. The designed segment curve is adopted to improve the state of the opening of the rear tire blank ring (figure 5): the bottom of the tire bead of the tire blank is provided with obvious extrusion traces of the fan-shaped blocks, the diameter of the opening of the tire bead is 511-512mm, and the tire bead is matched with a mold steel ring and has no problem of scraping when a pot is installed. The rear section condition (figure 6) is improved, the material distribution of the bead part is reasonable, no obvious glue accumulation phenomenon exists between the bottom of the steel wire ring and the tire body, and the thickness of the wear-resistant glue at the bottom of the bead is more than 2.0 mm.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. An improved method for rationalising the distribution of material to the bottom of a tyre bead, characterized in that it comprises:
calculating the thickness of the material at the bottom of the tire bead and the transverse material of the tire bead according to the material distribution at the opening of the tire blank;
comparing the thickness of the tire bead bottom and the tire bead transverse material with the theoretical value of the distribution thickness of the finished tire material;
calculating the transverse compression ratio of the bottom of the tire bead and the tire bead, wherein the compression ratio is the percentage of the difference between the theoretical values of the thickness of the tire bead bottom and the transverse material of the tire blank and the distribution thickness of the finished tire material and the theoretical value of the distribution thickness of the finished tire material;
judging whether the tire bead bottom and the tire bead transverse compression rate meet the design size requirement of the tire bead part;
if so, determining that the curve design of the fan-shaped block is reasonable;
if not, redesigning the fan-shaped block curve.
2. The method of claim 1, wherein said bead mouth material distribution includes the location and size of the bead portion material.
3. The method of claim 1, wherein meeting tire bead design dimensional requirements includes a bead bottom and a lateral compressibility in the range of 12-16%.
4. The method of claim 2 wherein said materials of said bead portion comprise a bead wire, an innerliner, a sidewall, a chafer, and a carcass, said thickness being the sum of the thickness measurements of the materials.
5. The method as claimed in claim 1, wherein said bead opening diameter is 511-512 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110674702.8A CN113561545B (en) | 2021-06-18 | 2021-06-18 | Improvement method for ensuring rationalization of distribution of tire bead bottom materials |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110674702.8A CN113561545B (en) | 2021-06-18 | 2021-06-18 | Improvement method for ensuring rationalization of distribution of tire bead bottom materials |
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| CN113561545A true CN113561545A (en) | 2021-10-29 |
| CN113561545B CN113561545B (en) | 2023-04-18 |
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| CN202110674702.8A Active CN113561545B (en) | 2021-06-18 | 2021-06-18 | Improvement method for ensuring rationalization of distribution of tire bead bottom materials |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115027170A (en) * | 2022-07-25 | 2022-09-09 | 青岛轮云设计研究院有限责任公司 | Drawing method of semi-steel tire material distribution map |
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2021
- 2021-06-18 CN CN202110674702.8A patent/CN113561545B/en active Active
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| DE102005006076A1 (en) * | 2005-02-10 | 2006-08-17 | Continental Aktiengesellschaft | Method for winding and splicing a tire building part with a varying material thickness in the cross-sectional profile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115027170A (en) * | 2022-07-25 | 2022-09-09 | 青岛轮云设计研究院有限责任公司 | Drawing method of semi-steel tire material distribution map |
| CN115027170B (en) * | 2022-07-25 | 2023-03-31 | 青岛轮云设计研究院有限责任公司 | Drawing method of semi-steel tire material distribution map |
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| CN113561545B (en) | 2023-04-18 |
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