A comparative measurement method for quantifying the inner profile cord length of an all-steel radial tire

Abstract

The present invention relates to the field of tire manufacturing technology, specifically a comparative measurement method for quantifying the length of the inner contour cord of a full steel radial tire, marking the front and rear sides of the bottom center steel wire of the cross-section wire ring with a connecting line, grinding off the part of the carcass and the wrapping cloth wrapped around the bottom of the steel ring until the steel wire of the steel ring is completely exposed, drawing the extension line of the steel wire in the middle of the steel ring to the carcass, and cutting it off after stripping; calculating the length of the inner contour cord, measuring the length of the steel wire that is stripped and cut off, and recording it as a; construction theoretical length, recorded as b; construction flat width, recorded as B; recording the number of steel wires with the widest spacing of the steel ring, recorded as N; the size specification of the steel wire diameter is recorded as c, and the size specification of the wrapping cloth thickness is recorded as d; the number of wrapping cloth layers is recorded as n; construction theoretical length b=B-2*(N / 2*c+n*d); there is a difference between the construction theoretical design and the actual finished product=a-b. The technical method of the present invention is equivalent to the adjustment of the construction flat width value, and the method is feasible and convenient, which greatly improves the efficiency of solving such problems.

Description

Technical Field

[0001] The patent of this invention belongs to the field of tire manufacturing technology, specifically to the structural construction design of all-steel radial tires. It is a new technology for comparing and measuring the inner contour cord length of finished tires. Background Art

[0002] The bending of the shoulder cord of the all-steel radial tire is a common quality problem in the tire industry. There are many influencing factors. During the production and manufacturing process of the all-steel radial tire, if there are deviations in the design parameters, equipment failures, personnel operation and other process fluctuations, the shoulder cords of the finished product X-ray imaging are not straight after the tire embryo is formed and vulcanized, that is, the cords are bent. This problem can easily lead to bulging of the finished product, and the tire is prone to early damage when running at high speed and under heavy load, reducing the service life of the tire.

[0003] The mechanism of this problem is closely related to the flat width parameters of the construction design: the flat width parameter is the straight-line distance of the cord between the two steel rims of the tire, and most of the time it is the straight-line distance of the outer edge of the widest point of the steel rim. The shoulder cord bending problem is seriously affected and restricted by the process conditions of each process in the production process. Solving this problem requires considering various factors to avoid any possible other quality problems. With the rapid development of my country's tire industry, consumers have higher and higher requirements for tire performance. Any tire company will inevitably encounter the problem of finished cord bending during the iteration, cost reduction, unification, conversion and upgrading of production process technology, and the investigation and improvement of this problem require extremely high capabilities of the technical personnel of each tire company.

[0004] According to the previous technology, the only way to solve this kind of quality problem is to compare the X-ray images of the finished tires and the bending grade standards for analysis and improvement. In addition, the height change of the tire body turn-up end point can be further analyzed through the cross-sectional measurement data to estimate the adjustment value of the flat width value. The time, manpower and material costs consumed in the process of process technology improvement and product structure upgrade are extremely high. Summary of the invention

[0005] The object of the present invention is to provide a comparative measurement method for quantifying the length of the inner profile cord of an all-steel radial tire, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A comparative measurement method for quantifying the inner profile cord length of an all-steel radial tire comprises the following steps:

[0008] Step 1: Select a finished tire that is produced normally and has no quality problems;

[0009] Step 2: To ensure more accurate measurement, cut multiple sections (3-5) for analysis;

[0010] Step 3: Select the regularly arranged sections of the wire ring and fix the sections of the wire ring;

[0011] Step 4: Mark the front and rear sides of the bottom center wire of the cross-section wire ring, grind off the part of the carcass and the wrapping cloth wrapped around the bottom of the steel ring until the steel wire of the steel ring is completely exposed, draw the extension line of the middle wire of the steel ring to the carcass, cut it off after peeling, and then measure it completely in a straight line; peel off two or more steel wires according to the method described in this step; take the median value of the peeled multiple steel wires as the steel wire length after measurement;

[0012] Step 5: Calculate the inner contour cord length, measure the length of the stripped and cut steel wire, record it as a; the construction theoretical length, record it as b; measure the construction flat width, record it as B; record the number of steel wires with the widest spacing of the steel ring, record it as N; the size specification of the steel wire diameter is record it as c, the size specification of the wrapping cloth thickness is record it as d; the number of wrapping cloth layers is record it as n;

[0013] Theoretical construction length b=B-2*(N / 2*c+n*d);

[0014] There is a difference between the theoretical design and the actual finished product after construction = ab.

[0015] As a further solution of the present invention: the cross-section selected in step three must be guaranteed to be intact in shape and regularly arranged.

[0016] As a further solution of the present invention: in step 4, the break points are selected on both sides of the cross section, and are marked before and after the break point of the single wire at the center of the bottom of the steel ring.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This application fills the gap in the research technology of solving the problem of cord bending: it can specifically and accurately quantify and compare the inner profile cord length and difference value of the finished all-steel tire; it is measured completely in a straight line; that is, it is equivalent to the adjustment of the construction flat width value. The method is feasible and convenient, which greatly improves the efficiency of solving such problems;

[0019] In the process of improving production technology, reducing costs, unifying structural construction, conversion and upgrading, the specific construction level and width change data can be calculated scientifically, effectively and accurately, reducing cumbersome trial production and verification methods and greatly reducing the company's R&D costs.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings herein are incorporated into and constitute a part of the specification to illustrate embodiments consistent with the present application and are used together with the specification to explain the principles of the present application. At the same time, these drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments.

[0022] Figure 1 A measurement position diagram for quantifying the inner profile cord length of an all-steel radial tire provided by an embodiment of the present invention.

[0023] Figure 2 A schematic diagram for comparing a normal steel ring cross section and a loose ring cross section provided in an embodiment of the present invention.

[0024] Figure 3 This is an electronic photographic comparison diagram of a qualified steel ring cross section and an unqualified cross section provided in an embodiment of the present invention.

[0025] Figure 4 This is an electronic photograph of the steel wire stripping process provided by an embodiment of the present invention.

[0026] Figure 5 This is an electronic photographic work diagram for measuring the stripped steel wire provided in an embodiment of the present invention.

[0027] Figure 6 This is a measurement schematic diagram of application case 1 of the present invention.

[0028] Figure 7 This is a measurement schematic diagram of application case 1 of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention, and examples thereof are shown in the drawings. When the following description refers to the drawings, it is obvious that the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0031] The carcass cord of the inner profile of the all-steel load-bearing radial tire is bent around the bead ring after forming, so the measurement accuracy of the point corresponding to the flat width is poor, so the length directly below the center of the bead ring is measured:

[0032] The measured length of the single wire corresponding to the different bending degrees of the shoulder cord is different. The difference is the amount of inner drawing of the cord after bending caused by a certain factor, which can be used to analyze quality problems. Through the calculation of the relationship between the flat width and the thickness of the steel ring and the wrapping cloth, and the width of the single wire after glue coating, the difference between this value and the actual stripped cord length can also accurately reflect the difference between the theoretical design of the construction and the actual finished product.

[0033] Since the locking ring during the molding process causes the carcass to bend, the free end of the carcass tilts after the wrapping, and the actual measurement of the inner contour line distance between the widest two points of the steel ring is inaccurate. Therefore, the method of measuring the distance between the midpoints directly below the two steel rings is used for comparison (please refer to Figure 1 ).

[0034] In this embodiment;

[0035] A comparative measurement method for quantifying the inner profile cord length of an all-steel radial tire is provided, comprising the following steps:

[0036] Step 1: Select a finished tire that is produced normally and has no quality problems;

[0037] Step 2: To ensure more accurate measurement, cut multiple sections (3-5) for analysis;

[0038] Step 3: Select the regularly arranged sections of the wire ring and fix the sections of the wire ring;

[0039] Step 4: Mark the front and back sides of the bottom center wire of the cross-section wire ring, grind off the carcass and wrapping cloth wrapped around the bottom of the steel ring until the steel wire of the steel ring is completely exposed, draw the extension line of the middle wire of the steel ring to the carcass, cut it off after peeling, and then measure completely in a straight line;

[0040] Step 5: Calculate the inner contour cord length, measure the length of the stripped and cut steel wire, record it as a; the construction theoretical length, record it as b; measure the construction flat width, record it as B; record the number of steel wires with the widest spacing of the steel ring, record it as N; the size specification of the steel wire diameter is record it as c, the size specification of the wrapping cloth thickness is record it as d; the number of wrapping cloth layers is record it as n;

[0041] Theoretical construction length b=B-2*(N / 2*c+n*d);

[0042] There is a difference between the theoretical design and the actual finished product after construction = ab.

[0043] This application fills the gap in the research technology of solving the problem of cord bending: it can specifically and accurately quantify and compare the inner profile cord length and difference value of the finished all-steel tire; it is measured completely in a straight line; that is, it is equivalent to the adjustment of the construction flat width value. The method is feasible and convenient, which greatly improves the efficiency of solving such problems;

[0044] In the process of improving production technology, reducing costs, unifying structural construction, conversion and upgrading, the specific construction level and width change data can be calculated scientifically, effectively and accurately, reducing cumbersome trial production and verification methods and greatly reducing the company's R&D costs.

[0045] In one case of this embodiment, it is appropriate to wrap the steel ring with a layer of wrapping cloth after it is formed to reduce the influence of the gap of the wrapping cloth on the data.

[0046] In one case of this embodiment, in order to ensure more accurate measurement, multiple analysis sections are cut, and the selected sections must ensure that the steel ring is not scattered. Figure 2 , the left picture shows the normal steel ring section, and the right picture shows the loose ring section;

[0047] In addition, the selected cross-section must ensure that the shape is intact and the arrangement is regular, and there should be no gaps between adjacent wires; please refer to Figure 3 The left picture shows the cross section of a normal steel ring, and the right picture shows the cross section of a loose ring.

[0048] In one case of this embodiment, see Figure 4 , mark the front and back lines of the bottom layer of center steel wire on both sides of the section, grind the bottom layer of cloth covering the steel ring until the steel wire is completely exposed, draw the extension line of the middle steel wire to the carcass, and cut it off after peeling; the break points are selected on both sides of the section, and marked before and after the breakpoint of the single wire in the center of the bottom of the steel ring.

[0049] In one case of this embodiment, see Figure 5 In order to reduce operational errors, two or more steel wires need to be stripped off; the more steel wires stripped off during the operation, the more accurate the calculation will be. After measuring the multiple steel wires stripped off, take the median value as the steel wire length record.

[0050] The method of the present application is further explained below with reference to application cases.

[0051] Application Case 1;

[0052] See also Figure 6 For example: 9.00R20 specification, the flat width (positioning outside the wire ring) is 642mm, the wire arrangement of the wire ring is 5-6-7-8-7-6-5, the diameter of the wire after glue coating is 1.8mm, and the wire ring is wrapped with 1 layer of cloth after forming, with a thickness of 0.88mm.

[0053] 1. The length of the steel wire cut off during this stripping is 640mm.

[0054] 2. Construction flat width B: 642, 8 steel wires at the widest point of the steel ring, C equals 4 steel wire diameters + 1 layer of wrapping thickness. According to the formula b=B-2C, it can be obtained that: b=642-2*(4*1.8+1*0.88)=625.84 (theoretical construction length);

[0055] There is a difference between the theoretical construction design and the actual finished product, namely: 640-625.84=14.16≈14 (unit: mm).

[0056] Application Case 2;

[0057] See also Figure 7 For example, take the 9.00R20 tire as an example, the flat width is 642mm, the wire arrangement of the wire ring is 5-6-7-8-7-6-5, the diameter of the wire after rubber coating is 1.8mm, and a layer of wrapping cloth is wrapped around the wire ring after forming.

[0058] 1. In the example given this time, 6 steel wires were cut and stripped, with lengths of 640 / 639 / 640.5 / 639.5 / 641 / 640 (in mm), with an error of ±1. The median value is a=640.

[0059] 2. Construction flat width B: 642, 8 steel wires at the widest point of the steel ring, C equals 4 steel wire diameters + 1 layer of wrapping thickness. According to the formula b=B-2C, it can be obtained that: b=642-2*(4*1.8+1*0.88)=625.84 (theoretical construction length);

[0060] The difference between construction and finished product is 640-625.84=14.16≈14 (in mm).

[0061] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A comparative measurement method for quantifying the inner profile cord length of an all-steel radial tire, characterized in that: The following steps are involved: Step 1: Select a finished tire that is produced normally and has no quality problems; Step 2: In order to ensure more accurate measurement, cut several sections for analysis; Step 3: Select the regularly arranged sections of the wire ring and fix the sections of the wire ring; Step 4: Mark the front and rear sides of the bottom center wire of the cross-section wire ring, grind off the part of the carcass and the wrapping cloth wrapped around the bottom of the steel ring until the steel wire of the steel ring is completely exposed, draw the extension line of the middle wire of the steel ring to the carcass, cut it off after peeling, and then measure it completely in a straight line; peel off two or more steel wires according to the method described in this step; take the median value of the peeled multiple steel wires as the steel wire length after measurement; Step 5: Calculate the inner contour cord length, measure the length of the stripped and cut steel wire, record it as a; the construction theoretical length, record it as b; measure the construction flat width, record it as B; record the number of steel wires with the widest spacing of the steel ring, record it as N; the size specification of the steel wire diameter is record it as c, the size specification of the wrapping cloth thickness is record it as d; the number of wrapping cloth layers is record it as n; Theoretical construction length b=B-2*(N / 2*c+n*d); There is a difference between the theoretical design and the actual finished product after construction = ab.

2. The comparative measurement method for quantifying the inner profile cord length of an all-steel radial tire according to claim 1, characterized in that: The number of layers of fabric wrapped around the steel ring in step 1 should be included.

3. The comparative measurement method for quantifying the inner profile cord length of an all-steel radial tire according to claim 1, characterized in that: The sections selected in step 3 must be of good shape and regularly arranged.

4. The comparative measurement method for quantifying the inner profile cord length of an all-steel radial tire according to claim 1, characterized in that: In step 4, the break points are selected on both sides of the cross section and marked before and after the single wire break point at the center of the bottom of the steel ring.

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