CN116278092B - Method for improving engineering radial tire bead durability - Google Patents
Method for improving engineering radial tire bead durability Download PDFInfo
- Publication number
- CN116278092B CN116278092B CN202310553419.9A CN202310553419A CN116278092B CN 116278092 B CN116278092 B CN 116278092B CN 202310553419 A CN202310553419 A CN 202310553419A CN 116278092 B CN116278092 B CN 116278092B
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- Prior art keywords
- lower rubber
- tire
- rubber core
- towards
- rear press
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- 239000011324 bead Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000003825 pressing Methods 0.000 claims abstract description 18
- 238000003475 lamination Methods 0.000 claims description 22
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000011162 core material Substances 0.000 abstract description 80
- 238000009826 distribution Methods 0.000 abstract description 9
- 230000032798 delamination Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 238000010030 laminating Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
Classifications
-
- 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
- B29D30/0061—Accessories, details or auxiliary operations not otherwise provided for
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Abstract
The invention discloses a method for improving the durability of a tire bead of an engineering radial tire, and belongs to the technical field of tires. The technical proposal is as follows: and (5) synchronously and symmetrically pressing the lower rubber core by using a rear pressing roller and finishing the pressing step sequence in three sections. The invention can effectively improve the uniformity and stability of the distribution of the lower rubber core material of the giant radial tire bead, and avoid the quality problems of early bead bulge, delamination and the like in the use process of the tire caused by uneven thickness distribution of the lower rubber core.
Description
Technical Field
The invention relates to the technical field of tires, in particular to a method for improving the durability of a tire bead of an engineering radial tire.
Background
In the current process of producing the giant radial tire by the sectional forming machine, the first section is transferred to the second section after the production of the tire tube is completed, the second section carries out buckling operation, after the buckling operation is completed, the lower rubber core is subjected to auxiliary bonding by using the reverse wrapping push rod, and then the rear press roller is pressed. The auxiliary lamination is that the lower end point of the lower rubber core starts to be boosted through the reverse wrapping push rod, the lower rubber core is gradually deformed under the action of the reverse wrapping push rod, and the contact and the adhesion with the tire cylinder are completed. However, as the turn-up push rod is distributed in finger shape, gaps exist between fingers, the turn-up push rod can be enabled to passively deform under the action of thrust in the boosting process, and finally the turn-up push rod is enabled to be in circumferential wave shape, so that the thickness difference of the lower rubber core at the thrust and non-thrust points is caused, the uniformity of the thickness distribution of the lower rubber core material is affected, deviation of a curve of the turn-up of a tire body is caused, uneven tire bead stress occurs, and the quality problems such as early tire bead bulge and delamination occur in the using process of the tire.
In addition, the problem of unreasonable distribution exists in the tire bead lower rubber core material, and the first pad rubber overlaps with the edge of the lower rubber core, and the first pad rubber covers 26% -30% of the total width of the lower rubber core, namely an area A shown in fig. 6, and the coverage area is relatively small. Because the hardness of the lower rubber core is greater than that of the first cushion rubber, the area of the first cushion rubber covering the lower rubber core is too small, so that the stress cannot be uniformly distributed to the whole tire bead, and the stress concentration points can appear at the positions of the upper end point of the lower rubber core of the tire bead and the lower end point of the first cushion rubber in the rolling process of the tire, so that the durability of the tire bead is affected.
Disclosure of Invention
The invention aims to solve the technical problems that: the method for improving the durability of the engineering radial tire bead can effectively improve the uniformity and stability of the distribution of the core materials under the giant radial tire bead, and avoid the quality problems of early bead bulge, delamination and the like in the use process of the tire caused by uneven distribution of the thickness of the core.
The technical scheme of the invention is as follows:
the method for improving the durability of the engineering radial tire bead comprises the following steps of pressing the lower rubber core:
s1, preparation work before lamination: respectively moving the two rear press rolls to the outer side surfaces of the two lower rubber cores along the axial direction and the radial direction, and contacting the corresponding planes on the outer side surfaces of the lower rubber cores, wherein an included angle a is formed between the rear press rolls and the vertical direction; then controlling the rear press roller to axially move towards the center direction, and applying initial pressure to the lower rubber core towards the tire cylinder direction;
s2, one-stage lamination: controlling the rear press roller to axially move a distance e towards the center direction and radially move a distance g upwards, wherein an included angle between the rear press roller and the vertical direction is b, and finishing one-section pressing of the lower rubber core towards the tire cylinder; wherein the distance e is the axial distance from the position corresponding to 1/2 tyre tube height to the tyre tube on the inner side surface of the lower rubber core, the distance g is the height difference between the plane of the steel wire ring and the 1/2 tyre tube height, and b=a- (5-10 °);
s3, two-stage lamination: controlling the rear press roller to axially move a distance j towards the center direction and radially move a distance h upwards, wherein an included angle between the rear press roller and the vertical direction is c, and finishing the two-section pressing of the lower rubber core towards the tire cylinder; wherein the distance j is the axial distance from the top of the corresponding tire tube to the tire tube on the inner side surface of the lower rubber core, the distance h is the height difference between the height of the tire tube and the top of the tire tube, and c=b- (5-10 °);
s4, three-section lamination: controlling the rear press roller to axially move by a distance n+ (20-50) mm towards the central direction, and finishing the pressing of the lower rubber core towards the tire cylinder, wherein the included angles between the radial direction and the vertical direction are unchanged; wherein the distance n is the distance from the top of the corresponding tire cylinder to the upper end point of the lower rubber core on the inner side surface of the lower rubber core.
Preferably, in step S1, a=40° to 75 °.
Preferably, in the step S1, the rear press roller is controlled to axially move for 10-30 mm towards the center direction, and initial pressure is applied to the lower rubber core towards the tire cylinder direction.
Preferably, after the pressing of the lower rubber core is completed, a second cushion rubber is attached to the outer side surface of the lower rubber core, and the second cushion rubber covers 45% -100% of the total width of the outer side surface of the lower rubber core (as shown in a region B in FIG. 5), so that the stress of the whole tire bead can be uniformly distributed in the rolling process of the tire; and then the first cushion rubber is attached to the outer side surface of the second cushion rubber.
Preferably, the second cushion gum is gradually thinned from the upper end point to the lower end point. The pressure from the crown and the tire shoulder is transmitted from the tire side to the tire bead in the rolling process, and the supporting force of the rim is transmitted to the tire bead and the tire side; the force between objects is mutually applied, and under the condition that the overall thickness design of the tire bead is unchanged, the force transmission process is greatly influenced by the distribution trend of tire bead materials, so that the thickness of the second cushion rubber is designed from thick to thin, namely, the lower rubber core design is distributed from thin to thick, the pressure from the tire crown and the tire shoulder can be gradually thinned along with the thickness of the second cushion rubber in the rolling process of the tire, the pressure is uniformly distributed to the tire bead, and the problem of stress concentration is solved.
Compared with the prior art, the invention has the following beneficial effects:
the method can effectively improve the uniformity and stability of the distribution of the lower rubber core material of the tire bead of the giant radial tire, avoid the quality problems of early tire bead bulge, delamination and the like in the use process of the tire caused by uneven thickness distribution of the lower rubber core, and improve the durability of the tire bead.
Drawings
Fig. 1 is a schematic view of the position of the back press roll on the lower core in step S1 of the method of the present invention.
Fig. 2 is a schematic view of the position of the back press roller at step S2 on the lower core in the method of the present invention.
Fig. 3 is a schematic view of the position of the back press roller at step S3 on the lower core in the method of the present invention.
Fig. 4 is a schematic view of the position of the back press roller at step S4 on the lower core in the method of the present invention.
Fig. 5 is a schematic structural diagram of a second cushion gum of the present invention.
Fig. 6 is a schematic structural diagram of a lower core and a first cushion rubber of a conventional tire.
In the figure, 1, a rubber core is arranged; 2. first pad glue; 3. a second cushion adhesive; 4. a bead ring; 5. a tire tube; 6. and a rear press roller.
Detailed Description
In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
The embodiment provides a method for improving the durability of a 50/80R57 engineering radial tire bead, which comprises the steps that in the forming process, a first section is transferred to a second section after the production of a tire cylinder 5 is completed, the second section is subjected to buckling operation, after the buckling operation is completed, two lower rubber cores 1 are synchronously and symmetrically pressed by a rear pressing roller 6, so that the lamination of the lower rubber cores 1 is completed, the lamination mode ensures that the relative stress of the lower rubber cores 1 is uniform in the lamination process, the thickness difference of the lower rubber cores 1 is reduced, and the stability of the product quality is improved. Specifically, as shown in fig. 1-4, the following steps are adopted to press the lower rubber core 1:
s1, preparation work before lamination: after the production of the tire tube 5 is completed, the tire tube is transferred to the second section, the second section carries out buckling operation, after the buckling operation is completed, the two rear press rollers 6 are respectively moved to the outer side surfaces of the two lower rubber cores 1 along the axial direction and the radial direction and are contacted with the upper plane of the corresponding hexagonal steel wire ring 4 on the outer side surface of the lower rubber core 1, the rear press rollers 6 are in an inclined state relative to the vertical direction, and an inclined included angle a=60 degrees; subsequently, the rear press roller 6 is controlled to axially move 15mm in the center direction, and an initial pressure is applied to the lower rubber core 1 in the direction of the tire tube 5. Wherein the axial direction is the left-right direction in the figure; the radial direction is the up-down direction vertical to the axial direction in the figure; the outer side surface of the lower rubber core 1 is a side surface facing away from the tire cylinder 5, and the other side surface is an inner side surface; the center direction refers to a direction toward the center of the two lower cores 1 symmetrically disposed.
S2, one-stage lamination: the rear press roller 6 is controlled to move axially for 15mm in the center direction and move radially upwards for 25mm in the radial direction, and an included angle b=50° between the rear press roller and the vertical direction is formed, so that one section of pressing of the lower rubber core 1 to the tire cylinder 5 is completed;
s3, two-stage lamination: the rear press roller 6 is controlled to move axially for 33mm and radially upwards for 60mm towards the center direction, and an included angle c=40° between the rear press roller and the vertical direction is formed, so that the two-section pressing of the lower rubber core 1 towards the tire cylinder 5 is completed;
s4, three-section lamination: the rear press roller 6 is controlled to axially move by 55mm towards the center direction, the included angle between the radial direction and the vertical direction is unchanged, and the pressing of the lower rubber core 1 towards the tire cylinder 5 is completed.
After the pressing of the lower rubber core 1 is completed, as shown in fig. 5, a second cushion rubber 3 is attached to the outer side surface of the lower rubber core 1, the material of the second cushion rubber is the same as that of the first cushion rubber 2, the width of the second cushion rubber 3 covering the lower rubber core 1 is 100% of the total width of the outer side surface of the lower rubber core 1, and then the first cushion rubber 2 is attached to the outer side surface of the second cushion rubber 3.
Comparative example 1
The lower rubber core 1 is pressed by adopting a reverse-wrapping push rod instead of the rear press roller 6 in the embodiment 1, and the operation steps are the same as the embodiment 1.
The tires produced in example 1 and comparative example 1 were subjected to section cutting, and the thickness of the lower core 1 was measured, and the measurement results are shown in tables 1 to 2:
table 1 thickness measurement of the lower core 1 of the tire of example 1
Table 2 thickness measurement of lower core 1 of the tire of comparative example 1
As can be seen from table 1, the thickness of the tire blank lower rubber core 1 produced in example 1 meets the design requirement, and the tire section is cut and analyzed, the lower rubber core 1 is not folded, the lower rubber core 1 and the tire cylinder 5 are tightly attached without bubbles, the design requirement is met, and the quality uniformity and the stability are good. As can be seen from table 2, the thickness of the tire blank lower rubber core 1 produced in comparative example 1 at some points does not meet the design requirement, and the cutting analysis is performed on the tire section, so that the problem of thinner thickness of the lower rubber core 1 is found, and the thickness exceeds the control tolerance and does not meet the design requirement.
Meanwhile, the tire bead endurance time of the tire with the 50/80R57 specification produced in the comparative example 1 is 127h and is lower than 150h, and the tire bead endurance time does not meet the design target; the tire bead endurance time of the tire with 50/80R57 standard produced in the example 1 is 159h and is more than 150h, the tire bead endurance time meets the design requirement, and the tire bead endurance time is improved by 25.20% compared with the tire bead endurance time of the tire with the comparative example 1.
Comparative example 2
The difference from example 1 is that: in the steps S2 and S3, the rear press roller 6 only performs radial movement and change of an inclined included angle and does not perform axial movement; in step S4, the axial moving distance of the rear press roller 6 to the center direction is 103mm, and the pressing of the lower rubber core 1 to the tire cylinder 5 is completed.
In the laminating process of the lower rubber core 1 of the comparative example, the axial movement of the rear press roller 6 is not carried out according to the requirement, so that the lower rubber core 1 is not effectively bonded with the tire cylinder 5 in the laminating area of one-stage lamination and two-stage lamination, the section cutting is carried out after the tire production is finished, air bubbles exist between the lower rubber core 1 and the tire cylinder, and the lower rubber core 1 is folded, so that the design requirement is not met.
Comparative example 3
The difference from example 1 is that: in the step S1, the rear press roller 6 moves to the outer side surfaces of the two lower rubber cores 1 along the axial direction and the radial direction respectively and contacts the position 15mm below the upper plane of the corresponding hexagonal steel wire ring 4 on the outer side surface of the lower rubber core 1; in step S2, the axial movement and the change of the inclination angle of the rear press roller 6 are the same as those of embodiment 1, but no radial movement is performed; in step S3, the axial movement and the change in the inclination angle of the back press roller 6 are the same as those of embodiment 1, but the radial upward movement distance is 100mm.
In the laminating process of the lower rubber core 1 of the comparative example, the radial movement of the rear press roller 6 is not carried out according to the requirement, so that the blank bead ring 4 is pressed during lamination, the problem of grooving occurs, the section cutting is carried out after the tire production is finished, and the bead ring 4 is found to have scattered steel rings and changed shape, so that the design requirement is not met.
Comparative example 4
The difference from example 1 is that: in the step S1, initial pressure is applied to the lower rubber core 1 towards the direction of the tire cylinder 5, and the included angle a between the rear press roller 6 and the vertical direction is controlled to be 90 degrees; in step S2, the included angle b=90° between the rear press roll 6 and the vertical direction; in step S3, the included angle c=50° between the rear press roller 6 and the vertical direction; in step S4, the pinch angle of the rear press roller 6 with the vertical direction becomes 0 °.
In the laminating process of the lower rubber core 1 of the comparative example, the corner movement of the rear press roller 6 is not carried out according to the requirement, so that the lower rubber core 1 and the tire cylinder 5 are not effectively bonded in the laminating area of the two-section lamination and the three-section lamination of the tire blank lower rubber core 1, the section cutting is carried out after the tire production is finished, circumferential bubbles are found between the lower rubber core 1 and the tire cylinder 5, and the lower rubber core 1 is folded, so that the design requirement is not met.
Claims (3)
1. The method for improving the durability of the engineering radial tire bead is characterized by comprising the following steps of pressing a lower rubber core (1):
s1, preparation work before lamination: respectively moving the two rear press rolls (6) to the outer side surfaces of the two lower rubber cores (1) along the axial direction and the radial direction and contacting the upper plane of the corresponding bead ring (4) on the outer side surfaces of the lower rubber cores (1), wherein the rear press rolls (6) are inclined relative to the vertical direction, and the inclined included angle a=60 degrees; then the rear press roller (6) is controlled to axially move towards the center direction, and initial pressure is applied to the lower rubber core (1) towards the tire cylinder (5);
s2, one-stage lamination: the rear press roller (6) is controlled to move axially for 15mm towards the center direction and move radially upwards for 25mm, and an included angle b=50° between the rear press roller and the vertical direction is formed, so that one section of pressing of the lower rubber core (1) towards the tire cylinder (5) is completed;
s3, two-stage lamination: the rear press roller (6) is controlled to axially move for 33mm and radially move upwards for 60mm towards the center direction, and the included angle between the rear press roller and the vertical direction is c=40°, so that two-section pressing of the lower rubber core (1) towards the tire cylinder (5) is completed;
s4, three-section lamination: the rear press roller (6) is controlled to axially move towards the center direction by 55mm, the included angle between the radial direction and the vertical direction is unchanged, and the pressing of the lower rubber core (1) towards the tire cylinder (5) is completed.
2. The method for improving the durability of the tire bead of the engineering radial tire according to claim 1, wherein after the lamination of the lower rubber core (1) is completed, a second cushion rubber (3) is attached to the outer side face of the lower rubber core (1), the second cushion rubber (3) covers the lower rubber core (1) with a width which is 45% -100% of the total width of the outer side face of the lower rubber core (1), and a first cushion rubber (2) is attached to the outer side face of the second cushion rubber (3).
3. A method for improving the endurance of the beads of an engineering radial tire according to claim 2, characterized in that said second cushion gum (3) is tapered from the upper end point to the lower end point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310553419.9A CN116278092B (en) | 2023-05-17 | 2023-05-17 | Method for improving engineering radial tire bead durability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310553419.9A CN116278092B (en) | 2023-05-17 | 2023-05-17 | Method for improving engineering radial tire bead durability |
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| Publication Number | Publication Date |
|---|---|
| CN116278092A CN116278092A (en) | 2023-06-23 |
| CN116278092B true CN116278092B (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310553419.9A Active CN116278092B (en) | 2023-05-17 | 2023-05-17 | Method for improving engineering radial tire bead durability |
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| WO2023275457A1 (en) * | 2021-06-30 | 2023-01-05 | Compagnie Generale Des Etablissements Michelin | Tilting roller system for folding a pneumatic tyre carcass insert around a bead core and folding-up method |
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| JP4060841B2 (en) * | 2004-10-06 | 2008-03-12 | 住友ゴム工業株式会社 | Raw tire bead part molding method and raw tire bead part molding apparatus used therefor |
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2023
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6079467A (en) * | 1998-01-07 | 2000-06-27 | Sumitomo Rubber Industries, Ltd. | Heavy duty radial tire with specified arrangement of chafer and carcass turnup |
| CN2463166Y (en) * | 2000-10-10 | 2001-12-05 | 北京敬业机械设备有限公司 | Wire-ring triangluar rubber spring squeezing device for production of tyre |
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| CN202278751U (en) * | 2011-11-07 | 2012-06-20 | 三角轮胎股份有限公司 | Oblique drum shoulder molding drum of large-sized engineering radial tire |
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| Publication number | Publication date |
|---|---|
| CN116278092A (en) | 2023-06-23 |
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