CN111590939B - Radial tire and crown band winding method for improving tire uniformity LFV index - Google Patents
Radial tire and crown band winding method for improving tire uniformity LFV index Download PDFInfo
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- CN111590939B CN111590939B CN202010264883.2A CN202010264883A CN111590939B CN 111590939 B CN111590939 B CN 111590939B CN 202010264883 A CN202010264883 A CN 202010264883A CN 111590939 B CN111590939 B CN 111590939B
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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)
- B29D30/08—Building tyres
- B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
- B29D30/16—Applying the layers; Guiding or stretching the layers during application
- B29D30/1628—Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the core axis, to form an annular element
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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)
- B29D30/08—Building tyres
- B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
- B29D30/30—Applying the layers; Guiding or stretching the layers during application
- B29D30/3028—Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the drum axis, to form an annular element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/28—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers characterised by the belt or breaker dimensions or curvature relative to carcass
Abstract
The invention belongs to the technical field of tire manufacturing, and provides a radial tire aiming at the problems that the circumferential strength is inconsistent, the deformation is inconsistent and the uniformity performance of the tire is obviously reduced due to inconsistent and asymmetric distribution of crown band strips, wherein the starting end and the ending end of the crown band strips are staggered by 180 degrees in the circumferential position of the tire; the invention also provides a crown band strip winding method for improving the LFV index performance of the tire uniformity, one end of the crown band strip is taken as a starting end, a circle of locking rings are wound in situ from the left side of the tire body, n.5 circles are spirally wound, n is a natural number, a circle of locking rings are wound in situ to the right side of the tire body, the winding is finished, and the starting end and the finishing end of the crown band strip are staggered by 180 degrees in the circumferential position of the tire; in order to ensure that the midline of the crown band coincides with the midline of the carcass, the winding turns (A-D)/B are calculated in advance, and relevant parameters are adjusted. By adjusting the head-tail distribution of the crown band strip, the non-uniform degree of the material is reduced, and the uniformity, particularly the performance of LFV indexes, is improved.
Description
Technical Field
The invention belongs to the technical field of tire manufacturing, and particularly relates to a radial tire and a crown band winding method for improving tire uniformity LFV index.
Background
The crown strip material plays a role in restraining the stretching of a belted layer in the tire and reducing the deformation of the tire. The spiral winding mode is a common attaching mode of the crown band strip in the tire manufacturing process at present. The spiral winding pattern includes five forms, as shown in fig. 1. The spirally wound crown band strip needs to be provided with a circle of locking edges at the edges to ensure the consistency of the total width of the whole circumference after the crown band strip is wound, but simultaneously, the crown band strip material is unevenly distributed at the two edges, the partial area is single-layer, the partial area is double-layer, and the width of the double-layer area is different.
The method is introduced in a simplest single-layer flat-laying type winding form and comprises the following steps that firstly, the initial position of the crown band is positioned at the distance (A/2-D/2) mm from the left side of the center, and the crown band is wound in situ for 360 degrees; step two, starting to lay flat and wind to the right edge of the total width of the crown band strip from each circle of spiral stroke (B) mm to the right, wherein the winding spiral angle is (A-D)/B360; and step three, positioning the initial position of the crown band strip at a distance (A/2-D/2) mm from the right side of the center, and winding the crown band strip for 360 degrees in situ.
At present, the winding mode of the crown band strip mainly meets the requirement of the whole width or the thread pitch, and the consistency of the total width of the whole circumference is ensured.
The uniformity of the tire directly influences the operation stability and the driving safety of the vehicle, and the improvement of the uniformity index of the tire has important significance. LFV is an important mechanical property index for measuring tire uniformity. The reasons why LFV is considered to be large by current research include: (1) semi-finished parts: firstly, the width of the tread is varied or the tread is snakelike and twisted when being extruded and stored; secondly, changing the width and angle of the belted layer or performing snake-shaped distortion; variation of the thickness or width of the belt cushion rubber; fourthly, the thickness and the height of the triangular glue are not uniform or the left side and the right side are not uniform. (2) The molding process comprises the following steps: firstly, the forming of the tread is inclined or partially inclined and twisted; secondly, width and angle variation is caused by snake-shaped distortion or feeding stretching when the belt layers are attached; thirdly, the belt layer cushion rubber is attached to be inclined or stretched in the forming process, and the size of the belt layer cushion rubber is varied; fourthly, the two-section forming drum shakes or swings to make the first-section tire blank incline when being fixed; the belt drum and the transfer ring rock or swing, and the transfer ring is asymmetric with the two-section forming center when clamping the belt layer and the tire tread to move; sixthly, the body ply has inclined reverse wrap and large reverse wrap height variation; seventhly, the steel wire ring shifts when the steel wire ring is inclined or reversely wrapped; eighthly, poor pressing of a press roller of the first-stage and second-stage forming machines causes the left and right materials of the green tire to be asymmetrical; (3) and (3) a vulcanization process: firstly, the deformation of the tire blank causes the incorrect vulcanization and shaping. Secondly, the shaping pressure is too large, the outer circumference of the tire blank exceeds the standard, and the tire crown center line of the vulcanized tire is fuzzy, deformed and even disappeared; the temperature difference between the upper part and the lower part of the vulcanization mould is large, so that the vulcanization degree of the upper part and the lower part of the vulcanized tire is inconsistent; fourthly, local edge emergence of the tire caused by poor vulcanization mold closing is required to adjust the mold closing force or the assembly precision of the mold; insufficient processing precision of the vulcanization mould, asymmetric upper and lower sizes or local pattern block deformation (see: tire uniformity and influence factors, the rest of double jade, tire industry, 2008 8 th).
In the research process, the inventor of the patent application finds that the materials of the left and right sides of the crown band strip are distributed in the circumferential direction and in the symmetrical position, the partial area crown band strip is single-layer and partial double-layer, the thickness and the mass distribution are not uniform, and the binding strength is not uniform. Taking a typical flush head and tail as an example, as shown in a circumferential development (fig. 2) after a crown band is wound, dark double-layer areas are concentrated together, left and right asymmetry is in a descending state, and the quality and intensity distribution are obviously uneven. The crown band material is distributed inconsistently and asymmetrically, which causes the inconsistentness of circumferential strength and deformation during running, and the uniformity performance of the tire is reduced, especially the LFV index performance is obviously reduced.
Disclosure of Invention
Aiming at the problems that the circumferential strength is inconsistent, the deformation is inconsistent and the uniformity performance of the tire is obviously reduced when the crown band material is distributed inconsistently and asymmetrically, the invention provides a radial tire, wherein the starting end and the finishing end of the crown band are staggered by 180 degrees on the circumferential position of the tire, and the whole circumferential difference of a double-layer area is minimum; the invention also provides a crown band strip winding method for improving the LFV index performance of the uniformity of the tire, which reduces the non-uniform degree of materials by adjusting the head and tail distribution of the crown band strip, makes up for improvement and improves the uniformity, particularly the LFV index performance.
The invention provides a radial tire, which comprises a tire body, a belt ply, a crown band strip and a tire tread, wherein the belt ply is arranged on the tire body, the crown band strip is spirally wound on the belt ply, the edges of the crown band strip are wound on two sides of the tire body, the central line of the crown band strip is superposed with the central line of the tire body, and the starting end and the finishing end of the crown band strip are staggered by 180 degrees in the circumferential position of the tire.
Theoretical analysis and multiple examples prove that the crown band is staggered by 180 degrees in the circumferential direction of the head and the tail after being wound, the method is the most uniform method for material distribution, the uniformity performance of the tire can be greatly improved, particularly the LFV index is improved, and the average 3kgf is reduced.
The invention also provides a single-layer flat laying type or double-layer flat laying type crown strip winding method for improving the LFV index performance of the uniformity of a tire, which comprises the following steps:
positioning the position of the initial end of the crown band strip at a position (A-D)/2 away from the left side of the center of the tire tread, and winding a circle at 360 degrees in situ to lock the ring, wherein A is the total width of the crown band strip, and D is the single width of the crown band strip;
step two, starting to lay flat and wind to the right of each circle of spiral stroke B to a position (A-D)/2 away from the right side of the center of the tread, wherein the winding spiral angle alpha is (A-D)/B360 degrees; in order to ensure that the circumferential positions of the head and the tail of the wound crown band are staggered by 180 degrees, the winding number of the crown band is set to n.5 circles, n is a natural number, and relevant parameters are adjusted through a formula of the winding number of the crown band being (A-D)/B;
and step three, positioning the end position of the crown band strip at the position (A-D)/2 away from the right side of the center of the tire tread, and winding for 360 degrees in situ to lock the ring.
The invention also provides a shoulder double-layer S-shaped crown band winding method for improving the LFV index of the tire uniformity, which comprises the following steps:
positioning the initial end position of a crown band at a position A/2- (C-D/2) away from the left side of the center of a tread, and directly winding the crown band leftwards by a spiral stroke B, wherein the winding angle is (C-D/2)/B360 degrees; taking an integer value from the calculation result of the (C-D/2)/B numerical value; a is the total width of the cap strip, and C is the width of the double-layer cap strip on one side of the tread;
winding a circle of 360 degrees at the starting end of the crown band strip;
step three, each circle of spiral stroke B is horizontally paved and wound rightwards to a position (A-D)/2 away from the right side of the center of the tread, and the winding spiral angle is (A-D)/B360 degrees; in order to ensure that the circumferential positions of the head and the tail of the wound crown band are staggered by 180 degrees, n.5 circles are set as the winding number of the crown band, n is a natural number, and relevant parameters are adjusted through a formula that the winding number of the crown band is equal to (A-D)/B;
winding a circle of 360 degrees at the position which is away from the right side (A-D)/2 of the center of the tread;
and step five, winding the steel wire left by each spiral stroke B (C-D/2)/B360 degrees.
The invention also provides a shoulder double-layer flat-laid type crown band strip winding method for improving the LFV index of the tire uniformity, which comprises the following steps:
positioning the position of the initial end of the crown band strip at a distance of (A-D)/2 from the left side of the center of the tire tread, and winding a circle in situ to lock the crown band strip, wherein A is the total width of the crown band strip, and D is the single width of the crown band strip;
step two, each circle of spiral stroke B is horizontally paved and wound rightwards, and the winding angle is (C-D/2)/B360 degrees; taking an integer value from the calculation result of the (C-D/2)/B numerical value; c is the width of the double-layer cap strip on one side of the tread;
step three, each circle of spiral stroke B is horizontally paved and wound rightwards, and the winding angle is (A-2C)/B360 degrees; the result of the numerical calculation of (A-2C)/B is n.5 circles, and n is a natural number;
step four, each circle of spiral stroke B is horizontally paved and wound rightwards, and the winding angle is (C-D/2)/B360 degrees; taking an integer value from the calculation result of the (C-D/2)/B numerical value;
and 5, winding 360 degrees at a position which is away from the right side (A-D)/2 of the center of the tread.
Through the steps, the distribution of 180-degree dislocation at the circumferential positions of the head and the tail of the wound crown band strip can be realized. The whole circumferential difference of the double-layer area after winding is minimum, and the bilateral symmetry difference is obviously reduced.
The invention is simple and easy to implement: through a detailed setting method, the expected effect can be achieved only by adjusting equipment parameters, and the operation and the adjustment are convenient; the method greatly improves the uniformity of the LFV index of the tire, can improve the controllability, reduce the noise, reduce abnormal abrasion and vehicle shaking, further reduce the fuel consumption, prolong the service life of the tire, furthest meet the customer demand, improve the potential value of the brand, increase the competitiveness of enterprises and reduce the environmental pollution.
Drawings
FIG. 1 is a schematic view of a prior art crown band winding; wherein: the total width of the crown band strips A, the spacing between the crown band strips a, the winding pitch of the crown band strips B, the width of the double-layer crown band strips on one side of the tread C, the single width of the crown band strips D and the arrow indicating the winding direction;
FIG. 2 is a circumferential development view of a conventional single-layer flat type winding effect;
FIG. 3 is a circumferential development view of the adjusted single-layer flat type winding effect of example 1;
FIG. 4 normal distribution diagram of LFV forward rotation value and LFV reverse rotation value after adjustment in example 1;
fig. 5 is a graph showing the change tendency of the daily rate of a-products before and after adjustment in example 1.
Detailed Description
The method is verified for a plurality of times for the winding forms of the crown band strips shown in the figure 1, and is actually implemented, so that the uniformity, particularly the LFV index performance is improved greatly and stably. The invention is explained in more detail below with reference to the examples and the figures.
Example 1 tire 225/70R16 gauge, cap strip form: single layer flat laying type
1. And (3) confirming the grading standard: the measured internal pressure of 200KPa and the measured load of 7230N (maximum load × 85%) in the specification, and the tire uniformity criterion are shown in table 1, and the unit of data of each item is Kgf. In the application, the data unit of tire uniformity is Kgf unless otherwise specified.
TABLE 1225/70R16 standards for tire uniformity determination
| Item | RFV | RF1H | LFV | CON |
| Criteria for determination | 13 | 10 | 6 | 7 |
2. Early-stage data statistical analysis: 225 tire testing data were collected over a period of time for analysis: the LFV mean value already exceeds the grade A standard judgment standard, and the standard deviation value is relatively large.
TABLE 2 tire uniformity test data
| Item | RFVCW | RF1HCW | LFVCW | RFVCCW | RF1HCCW | LFVCCW | CON |
| Criteria for determination | 13 | 10 | 6 | 13 | 10 | 6 | 7 |
| Mean value of | 8.00 | 3.48 | 6.72 | 7.33 | 3.18 | 5.46 | -2.50 |
| Standard deviation of | 2.04 | 1.72 | 1.69 | 2.12 | 1.64 | 1.38 | 1.96 |
3. Improving the process
3.1 trial production verification
The method is characterized in that the conditions of the existing production and equipment are unchanged, only single-factor variable adjustment is carried out, the typical crown strap joint is distributed in a head-tail parallel and 180-degree manner, and comparison verification is carried out:
the total width of the crown band strip is 212mm, and the width of the single strip is 15 mm.
3.1.1 crown band strip head-tail leveling setting step:
firstly, starting to position the initial position of the crown band at a distance of 91mm from the left side (212/2-15/2) of the center, winding the crown band for one circle at the original position by 360 degrees, and enabling the thread pitch to be 0 mm;
step two, calculating and selecting a pitch value of an integer circle, wherein the pitch value is 15-16 mm, so that the calculated pitch is 15.154mm, and the winding number is (212-15)/15.167 is 13 circles; therefore, each circle of spiral stroke is 15.154mm, the circular spiral is flatly spread and wound to the right edge of the total width of the crown band strip rightwards, and the circular spiral is wound for 13 circles;
and step three, starting to position the initial position of the crown band at a distance of 91mm from the right side (212/2-15/2) of the center, winding the crown band in situ for one circle at 360 degrees, and enabling the thread pitch to be 0 mm.
3.1.2 crown band head and tail 180 degree setting step:
firstly, starting to position the initial position of the crown band at a distance of 91mm from the left side (212/2-15/2) of the center, winding the crown band for one circle at the original position by 360 degrees, and enabling the thread pitch to be 0 mm;
step two, calculating and selecting a pitch value of (n.5) turns, wherein the pitch value is 15-16 mm, so that the calculated pitch is 15.76mm, and the winding turns are (212-15)/15.76 are 12.5 turns; therefore, each circle of spiral stroke is 15.76mm, the circular spiral strip starts to be flatly paved and wound to the right edge of the total width of the crown strip, and 12.5 circles of spiral strip are wound;
and step three, starting to position the initial position of the crown band at a distance of 91mm from the right side (212/2-15/2) of the center, winding the crown band in situ for one circle at 360 degrees, and enabling the thread pitch to be 0 mm.
3.1.3 finished tire uniformity test data are as follows:
the winding effect of the cap strip with the head and the tail positioned in parallel is shown in fig. 2, the left side is a winding shaft measuring and indicating diagram, and the right side is a circumference unfolding diagram. The left 180-degree position of the unfolded drawing is a position for positioning the winding starting head of the crown band strip, and the right 180-degree position is a position for positioning the tail of the winding ending crown band strip. Due to the characteristics of spiral winding, after winding is finished, the dark color area is a double-layer area, and the light color area is a single-layer area.
The winding effect of the crown band at the head and tail 180-degree positioning is shown in fig. 3, the left side is a winding shaft measuring drawing, and the right side is a circumference unfolding drawing. The left 90-degree position of the unfolded drawing is a position for positioning the winding starting head of the crown band strip, and the right 90-degree position is a position for positioning the tail of the winding ending crown band strip. The dark areas are double-layer areas and the light areas are single-layer areas.
TABLE 3 uniformity data for tires having cap strip strips distributed end to end
| Item | RFVCW | RF1HCW | LFVCW | RFVCCW | RF1HCCW | LFVCCW | CON |
| 1 | 8.37 | 4.36 | 8.77 | 7.61 | 3.28 | 6.90 | -4.55 |
| 2 | 5.88 | 1.20 | 10.40 | 5.47 | 1.71 | 7.77 | -4.60 |
| 3 | 8.66 | 3.51 | 7.49 | 8.27 | 3.63 | 6.98 | -3.75 |
| 4 | 9.17 | 5.72 | 6.01 | 10.05 | 5.76 | 6.78 | -3.43 |
| 5 | 6.13 | 2.29 | 7.79 | 5.64 | 2.40 | 5.17 | -5.92 |
| Mean value of | 7.64 | 3.41 | 8.09 | 7.41 | 3.35 | 6.72 | -4.45 |
| Standard deviation of | 2.92 | 1.86 | 3.39 | 3.02 | 1.68 | 2.64 | 2.27 |
TABLE 4 uniformity data for tires having a 180 ° distribution of crown band ends and tails
| Item | RFVCW | RF1HCW | LFVCW | RFVCCW | RF1HCCW | LFVCCW | CON |
| 1 | 6.71 | 2.88 | 2.66 | 10.20 | 2.88 | 4.11 | 2.11 |
| 2 | 6.55 | 3.86 | 1.76 | 6.87 | 3.86 | 5.56 | 1.59 |
| 3 | 6.12 | 1.43 | 3.54 | 7.06 | 1.43 | 3.60 | -1.58 |
| 4 | 9.26 | 4.96 | 3.00 | 6.17 | 4.96 | 2.92 | -2.85 |
| Mean value of | 7.1 | 3.3 | 2.7 | 7.76 | 3.3 | 4.0 | -0.2 |
| Standard deviation of | 2.6 | 1.3 | 1.2 | 3.7 | 1.3 | 2.1 | 1.6 |
As can be seen from the above data, the average value of the LFV index data in the positive rotation is reduced by 5.4kgf, the average value of the LFV index data in the negative rotation is reduced by 2.7kgf, the reduction ranges are 66.7% and 40.2%, respectively, and the effect is very obvious.
3.2 Mass production
Adopting the scheme that the head and the tail of the crown band are distributed at 180 degrees, carrying out batch production, and collecting the uniformity detection data of 99 tires for analysis as follows:
TABLE 5 Mass production tire uniformity data
| Item | RFVCW | RF1HCW | LFVCW | RFVCCW | RF1HCCW | LFVCCW | CON |
| Criteria for determination | 13 | 10 | 6 | 13 | 10 | 6 | 7 |
| Mean value of | 9.01 | 5.80 | 3.86 | 8.88 | 5.43 | 3.29 | 0.57 |
| Standard deviation of | 2.09 | 2.27 | 1.31 | 2.04 | 2.22 | 1.21 | 2.75 |
3.2.1 numerical comparison: compared with the detection data before adjustment, the LFV forward rotation value is reduced by 2.86kgf, the LFV reverse rotation value is reduced by 2.17kgf, the standard deviation is also improved by one grade, and the stability is obviously improved. The normal distribution of the data is not shown in FIG. 4.
3.2.2A grade product rate comparison: FIG. 5 is a graph showing the daily rate of A products before and after adjustment, the highest rate is increased from 63% in the early stage to 96%, the rate is stabilized at about 90%, and the rate of A products is greatly increased.
Example 2 tire specifications: 225/65R17 crown band form: shoulder double-layer S-shaped
1. Judging the grade standard: the internal pressure 200KPa and the load 7230N are measured according to the specification, and the classification standard is as follows: unit: kgf.
TABLE 6225/65 uniformity Standard of determination of tires R17
| Item | RFV | RF1H | LFV | CON |
| Criteria for determination | 13 | 10 | 6 | 7 |
2. Early-stage data statistical analysis: collecting 200 tire detection data for a period of time for analysis: the LFV mean value already exceeds the grade A standard judgment standard, and the standard deviation value is relatively large.
TABLE 7 tire uniformity test data
| Item | RFVCW | RF1HCW | LFVCW | RFVCCW | RF1HCCW | LFVCCW | CON |
| Criteria for determination | 13 | 10 | 6 | 13 | 10 | 6 | 7 |
| Mean value of | 4.51 | 1.76 | 5.11 | 4.88 | 2.20 | 5.80 | -0.23 |
| Standard deviation of | 0.63 | 1.12 | 1.33 | 0.68 | 0.91 | 1.63 | 1.05 |
3. Improving the process
3.1 trial production verification
The method is characterized in that the conditions of the existing production and equipment are unchanged, only single-factor variable adjustment is carried out, the typical crown strap joint is distributed in a head-tail parallel and 180-degree manner, and comparison verification is carried out:
the total width of the crown band strip is 197mm, and the width of a single strip is 15mm
3.1.1 crown band strip head-tail leveling setting step:
step one, positioning the initial end position of the crown band at a distance of 59mm from the left side of the center of the tread, and directly winding 2 turns leftwards with a spiral stroke of 15.166mm at a winding angle of 720 degrees;
step two, winding 1 turn 360 degrees in situ;
step three, spreading and winding 12 circles of the steel wire rod rightwards at the spiral stroke of 15.166mm, wherein the winding angle is 4320 degrees;
winding 1 turn 360 degrees in situ;
and step five, winding 2 turns of the steel wire left at the spiral stroke of 15.166mm per turn by the winding angle of 720 degrees.
3.1.2 crown band head and tail 180 degree setting step:
step one, positioning the initial end position of the crown band at a distance of 59mm from the left side of the center of the tread, and directly winding 2 turns leftwards with a spiral stroke of 15.826mm at a winding angle of 720 degrees;
step two, winding 1 turn 360 degrees in situ;
step three, paving and winding 11.5 circles rightwards with each circle of spiral stroke of 15.826mm, wherein the winding angle is 4140 degrees;
winding 1 turn 360 degrees in situ;
and step five, winding 2 turns of the steel wire left at the spiral stroke of 15.826mm per turn by the winding angle of 720 degrees.
3.1.3 finished tire uniformity test data are as follows:
TABLE 8 uniformity data for tires having cap strips distributed end-to-end flush
| Item | RFVCW | RF1HCW | LFVCW | RFVCCW | RF1HCCW | LFVCCW | CON |
| 1 | 4.56 | 1.32 | 4.23 | 4.35 | 1.54 | 7.54 | 6.25 |
| 2 | 5.85 | 4.01 | 6.47 | 6.44 | 3.44 | 5.93 | 6.94 |
| 3 | 5.61 | 2.29 | 5.13 | 6.66 | 3.51 | 4.00 | 7.41 |
| 4 | 4.76 | 3.01 | 4.39 | 5.22 | 1.95 | .85 | 5.48 |
| Mean value of | 5.19 | 2.66 | 5.06 | 5.67 | 2.61 | 6.33 | 6.52 |
| Standard deviation of | 1.82 | 1.23 | 2.18 | 2.17 | 1.14 | 2.99 | 2.70 |
TABLE 9 uniformity data for tires having a 180 ° distribution of crown band ends and tails
| Item | RFVCW | RF1HCW | LFVCW | RFVCCW | RF1HCCW | LFVCCW | CON |
| 1 | 5.60 | 3.30 | 2.85 | 7.73 | 5.11 | 2.55 | 3.70 |
| 2 | 4.77 | 7.78 | 4.79 | 4.24 | 6.79 | 3.87 | 4.00 |
| 3 | 4.95 | 2.72 | 3.02 | 6.55 | 4.52 | 3.17 | 3.11 |
| 4 | 4.20 | 0.76 | 4.74 | 4.62 | 2.86 | 4.81 | 3.18 |
| Mean value of | 4.88 | 3.64 | 3.85 | 5.78 | 4.82 | 3.60 | 3.50 |
| Standard deviation of | 1.68 | 2.83 | 1.72 | 2.46 | 2.21 | 1.58 | 1.30 |
From the above data, it can be seen that the LFV index data decreased by 1.21kgf in the normal rotation average value and 2.73kgf in the reverse rotation average value, and the decrease was close to or more than 30%. The batch production data is reduced by about 2kgf, and the grade A product rate is improved from 60% to more than 90%.
The double-layer tiled type, the double-layer S type and the shoulder double-layer tiled type are also set and verified by the method, the LFV value of the batch production is reduced by about 2kgf, and the grade A yield is improved from about 70% to 90%.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (4)
1. A radial tire comprises a tire body, a belt ply, a crown band ply and a tire tread, wherein the belt ply is arranged on the tire body, the crown band ply is spirally wound on the belt ply, the edges of the crown band ply are wound on two sides of the tire body, and the center line of the crown band ply is superposed with the center line of the tire body, and is characterized in that the starting end and the finishing end of the crown band ply are staggered by 180 degrees in the circumferential direction of the tire.
2. A single-layer flat-laying type or double-layer flat-laying type cap strip winding method for improving tire uniformity LFV indexes is characterized by comprising the following steps:
positioning the position of the initial end of the crown band strip at a position (A-D)/2 away from the left side of the center of the tire tread, and winding a circle in situ to lock the ring, wherein A is the total width of the crown band strip, and D is the single width of the crown band strip;
step two, starting to lay flat and wind to the right of each circle of spiral stroke B to a position (A-D)/2 away from the right side of the center of the tread, wherein the winding spiral angle alpha is (A-D)/B360 degrees; in order to ensure that the circumferential positions of the head and the tail of the wound crown band are staggered by 180 degrees, the winding number of the crown band is set to n.5 circles, n is a natural number, and relevant parameters are adjusted through a formula of the winding number of the crown band being (A-D)/B;
and step three, positioning the end position of the crown band strip at the position (A-D)/2 away from the right side of the center of the tire tread, and winding for 360 degrees in situ to lock the ring.
3. A shoulder double-layer S-shaped crown band winding method for improving tire uniformity LFV indexes is characterized by comprising the following steps:
positioning the initial end position of a crown band at a position A/2- (C-D/2) away from the left side of the center of a tread, and directly winding the crown band leftwards by a spiral stroke B, wherein the winding angle is (C-D/2)/B360 degrees; taking an integer value from the calculation result of the (C-D/2)/B numerical value; a is the total width of the cap strip, and C is the width of the double-layer cap strip on one side of the tread;
winding a circle of locking ring at the starting end of the crown band;
step three, each circle of spiral stroke B is horizontally paved and wound rightwards to a position (A-D)/2 away from the right side of the center of the tread, and the winding spiral angle is (A-D)/B360 degrees; in order to ensure that the circumferential positions of the head and the tail of the wound crown band are staggered by 180 degrees, n.5 circles are set as the winding number of the crown band, n is a natural number, and relevant parameters are adjusted through a formula that the winding number of the crown band is equal to (A-D)/B;
winding a circle of locking ring at the position (A-D)/2 away from the right side of the center of the tire tread;
and step five, winding the steel wire left by each spiral stroke B (C-D/2)/B360 degrees.
4. A shoulder double-layer flat-laying type crown strip winding method for improving tire uniformity LFV indexes is characterized by comprising the following steps:
positioning the position of the initial end of the crown band strip at a distance of (A-D)/2 from the left side of the center of the tire tread, winding a circle in situ for serging, wherein A is the total width of the crown band strip, and D is the single width of the crown band strip;
step two, each circle of spiral stroke B is horizontally paved and wound rightwards, and the winding angle is (C-D/2)/B360 degrees; taking an integer value from the calculation result of the (C-D/2)/B numerical value; c is the width of the double-layer cap strip on one side of the tread;
step three, each circle of spiral stroke B is horizontally paved and wound rightwards, and the winding angle is (A-2C)/B360 degrees; the result of the numerical calculation of (A-2C)/B is n.5 circles, and n is a natural number;
step four, each circle of spiral stroke B is horizontally paved and wound rightwards, and the winding angle is (C-D/2)/B360 degrees; taking an integer value from the calculation result of the (C-D/2)/B numerical value;
and 5, winding a circle of locking ring at the position (A-D)/2 away from the right side of the center of the tire tread.
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| CN113343469B (en) * | 2021-06-18 | 2022-08-26 | 青岛森麒麟轮胎股份有限公司 | Narrow crown band strip multilayer winding lap joint amount calculation method and application |
| CN113878914B (en) * | 2021-12-06 | 2022-02-18 | 赛轮(东营)轮胎股份有限公司 | Crown band winding method |
| CN114474809A (en) * | 2022-01-05 | 2022-05-13 | 青岛森麒麟轮胎股份有限公司 | Crown band winding method and run-flat tire |
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| CA1064805A (en) * | 1976-05-07 | 1979-10-23 | Henri J. Mirtain | Method for making a radial ply tire in a single building stage |
| JPS61157404A (en) * | 1984-12-28 | 1986-07-17 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire for passenger car |
| US5879484A (en) * | 1997-01-13 | 1999-03-09 | Bridgestone/Firestone, Inc. | Run flat banded pneumatic tire |
| FR2885079B1 (en) * | 2005-05-02 | 2007-07-06 | Michelin Soc Tech | PNEUMATIC AND METHOD OF MANUFACTURE |
| JP4953632B2 (en) * | 2006-01-04 | 2012-06-13 | 株式会社ブリヂストン | Aircraft radial tire |
| KR100778545B1 (en) * | 2006-03-30 | 2007-11-22 | 금호타이어 주식회사 | Tire with capply for inclined property |
| JP4963858B2 (en) * | 2006-04-13 | 2012-06-27 | 株式会社ブリヂストン | Aircraft tire and manufacturing method thereof |
| FR2922812B1 (en) * | 2007-10-30 | 2009-11-20 | Michelin Soc Tech | METHOD FOR MANUFACTURING A PNEUMATIC COMPRISING AN ELECTRICITY CONDUCTING INSERT BY WINDING STRIPS. |
| CN105691110A (en) * | 2016-01-19 | 2016-06-22 | 青岛科技大学 | Radial tire with steel wire cord winding structure |
| FR3050401B1 (en) * | 2016-04-25 | 2018-04-06 | Compagnie Generale Des Etablissements Michelin | AIRCRAFT TIRE HAVING IMPROVED ENDURANCE CARCASS REINFORCEMENT |
| CN107089022B (en) * | 2017-07-11 | 2019-04-23 | 山东丰源轮胎制造股份有限公司 | A kind of cap strip winding method |
| JP6971742B2 (en) * | 2017-09-25 | 2021-11-24 | Ｔｏｙｏ Ｔｉｒｅ株式会社 | Pneumatic tires and their manufacturing methods |
| CN110202810B (en) * | 2019-06-05 | 2022-07-26 | 贵州轮胎股份有限公司 | Method for preparing all-steel radial tire by spirally winding steel wire crown band strip in S shape |
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