Process for ensuring the quality of the turned-up tire carcass

Abstract

The present invention discloses a process for ensuring the quality of the turned-up carcass of a tire, belonging to the technical field of the manufacture of engineering machinery tires. The technical solution is as follows: the thickest point near the inner side of the upper rubber core is used as the fitting positioning point, and a marking line is provided at one end near the center line of the forming equipment on the inner side when the upper rubber core is being fitted. By adjusting the positioning standard of the upper rubber core of the components between the turned-up carcass ply and the carcass ply, the present invention greatly reduces the influence of the width change of the upper rubber core component on the turned-up carcass curve; at the same time, anti-misalignment markings are added to the inner and outer sides of the upper rubber core component, avoiding the abnormal thickness between the turned-up carcass plies caused by the inner and outer sides of the upper rubber core component being stuck in the wrong way.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery tire manufacturing, and particularly relates to a process for ensuring the quality of the carcass reverse wrapping of a tire. Background Art

[0002] At present, there are thickness fluctuations in the components between the carcass and the reverse-wrapped carcass ply of the radial tire products used for large and medium-sized rigid trucks. As a result, there are differences in the position and curve of the reverse-wrapped carcass ply of the tire. The main component affecting the reverse-wrapped carcass curve between the carcass plies is the upper rubber core. When the inner and outer sides of the upper rubber core are pasted reversely, it will cause differences in the position and curve of the reverse-wrapped carcass ply of the tire. At the same time, according to the current product factory inspection method, such abnormal problems cannot be identified, which may cause products that do not meet the design requirements to flow into the market, resulting in early problems such as bead drop and side drop during use, affecting the overall service life of the tire. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art and provide a process for ensuring the quality of the carcass reverse wrapping of a tire. By adjusting the positioning standard of the upper rubber core, which is a component between the reverse-wrapped carcass ply and the carcass ply, the influence of the width change of the upper rubber core component on the reverse-wrapped carcass curve is greatly reduced; at the same time, anti-misalignment marks are added to the inner and outer sides of the upper rubber core component to avoid abnormal thickness between the reverse-wrapped carcass plies caused by the reverse pasting of the inner and outer sides of the upper rubber core component.

[0004] The technical solution of the present invention is as follows:

[0005] The main component affecting the reverse-wrapped carcass curve between the carcass plies is the upper rubber core. The fitting method of this component is to use the inner end point of the upper rubber core as the fitting positioning point, and this positioning method is greatly affected by the width change of the upper rubber core. During production, the actual width of the upper rubber core will have a deviation of 5% - 10%. If the inner end point of the upper rubber core is used as the fitting positioning point, then the fitted upper rubber core component will move up or down as a whole by a distance of 5% - 10% of the width, making the reverse-wrapped carcass curve change greatly compared with the standard curve during design.

[0006] The process of guaranteeing the quality of tire carcass reverse packaging of the present invention uses the thickest point of the upper rubber core near the inner side as the fitting positioning point, and sets an identification line at one end of the inner side near the center line of the molding equipment when the upper rubber core is bonded. On the one hand, when the actual width of the upper rubber core fluctuates, the bonding of the upper rubber core component is performed with the thickest point on the inner side as the fitting positioning point, so that it can be ensured that no matter how much the actual width of the upper rubber core component fluctuates, the bonding position of the thickest point of the upper rubber core component is fixed, and the relative width fluctuation of the upper rubber core up and down displacement distance after bonding is small, so that the reverse carcass curve changes less. On the other hand, the upper rubber core component has the characteristics that the difference between the inner and outer widths is small but the thickness is different and it is difficult to identify the inner and outer sides with the naked eye, resulting in the problem that the inner and outer sides of the upper rubber core are easily reversed during the bonding process, causing the reverse carcass curve to change. Therefore, the present invention sets an identification line at the inner side of the upper rubber core near the center line of the molding equipment, which is convenient for the staff to identify the inner and outer sides of the upper rubber core during the production process, avoiding the phenomenon of reversed inner and outer sides, thereby ensuring the quality of tire carcass reverse packaging to a certain extent.

[0007] Preferably, the identification line is a double-line identification line to be distinguished from an existing single identification line on a tire.

[0008] Preferably, before laminating the upper rubber core, the laminating positioning point is confirmed, and the upper rubber core is laminating after confirmation, so as to avoid inaccurate laminating position of the upper rubber core caused by inaccurate laminating positioning point set by the program, thereby affecting the tire carcass turn-up quality.

[0009] Preferably, the method further comprises a testing step, wherein the testing step comprises the following steps:

[0010] After the S1 tire is vulcanized, several test points are divided at intervals on the sidewall and the outside of the bead, and the total tire thickness A, B, C, etc. corresponding to each test point is measured and recorded;

[0011] S2 measures and records the thickness A1, B1, C1, ... of the sidewall to the turned-up carcass layer rubber corresponding to each detection point from the outside of the tire, and measures and records the thickness A2, B2, C2, ... of the airtight layer to the carcass layer rubber corresponding to each detection point from the inside of the tire;

[0012] S3 uses the following formula to calculate the thickness of the turned-up carcass layer corresponding to the first detection point:

[0013] The thickness between the turned-up carcass layers corresponding to the first detection point = A-A1-A2-2d, where d is the diameter of the carcass steel wire. The calculation formula for the thickness between the turned-up carcass layers corresponding to other detection points is similar;

[0014] S4 determines whether the thickness between the turned-up carcass layers corresponding to each detection point meets the preset standard.

[0015] Preferably, the preset standard is the standard value of the interlayer thickness of the turned-up carcass ply corresponding to each detection point + tolerance.

[0016] Preferably, the tolerance is -1 mm to +2 mm.

[0017] The inspection procedure can prevent products that do not meet the design requirements from entering the market, resulting in early problems such as bead detachment and side detachment during use, which affect the overall service life of the tire.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. By adjusting the positioning standard of the gum core on the component between the turned-up carcass ply and the carcass ply, the present invention greatly reduces the influence of the width change of the gum core component on the curve of the turned-up carcass ply; at the same time, anti-misalignment marks are added to the inner and outer sides of the gum core component to avoid abnormal interlayer thickness of the turned-up carcass ply caused by the inner and outer sides of the gum core component being pasted in reverse.

[0020] 2. The present invention also provides an inspection procedure for the interlayer thickness of the turned-up carcass ply. This procedure can detect whether the interlayer thickness of the turned-up carcass ply of the finished tire meets the preset standard, preventing products that do not meet the design requirements from entering the market, resulting in early problems such as bead detachment and side detachment during use, which affect the overall service life of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the existing fitting positioning points and the fitting positioning points of the present invention on the gum core component.

[0023] Figure 2 It is a schematic diagram of the identification line of the gum core component of the present invention.

[0024] Figure 3 It is a schematic diagram of the position of the gum core component on the tire.

[0025] Figure 4 It is a schematic diagram of the measurement of the total thickness of the tire in the inspection procedure of the present invention.

[0026] Figure 5 It is a schematic diagram of the measurement of the outer thickness of the tire in the inspection procedure of the present invention.

[0027] Figure 6 It is a schematic diagram of the measurement of the inner thickness of the tire in the inspection procedure of the present invention.

[0028] In the figure, 1 is the rubber core, 2 is the carcass steel wire, 3 is the inner liner, 4 is the sidewall, and 5 is the marking line. Specific embodiments

[0029] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Comparative Example 1

[0031] Taking the production of 16.00R25 specification tires as an example for illustration, the production operations of components such as the inner liner 3 and the carcass of the isolating rubber are carried out according to requirements, and then the bead setting and pressing operations are carried out, and then the fitting of the rubber core 1 component is carried out (as Figure 3 shown). First, find the positioning and fitting point of the rubber core 1 component according to the requirements of the construction standard (i.e., the g point in Figure 1 ), use a tape measure to measure the position corresponding to the g point on the equipment during fitting to confirm that the preset g point position meets the production requirements. Then, the inner and outer sides of the rubber core 1 component are reversely pasted, and then operations such as pad rubber fitting, carcass reverse wrapping, pressing, etc. are carried out, and then the production and vulcanization of the tire blank are completed.

[0032] Inspect the quality of the reverse-wrapped carcass of the vulcanized finished tire, which specifically includes the following steps:

[0033] S1 Total thickness measurement: At intervals in the sidewall 4 and the outside of the bead, divide several detection points ( Figure 4 shown as 8 detection points), use a caliper to measure the total thickness of the tire corresponding to each detection point, and record as A, B...H; during measurement, for each point measured, mark the corresponding positions on the inner and outer sides of the tire to facilitate the subsequent measurement of the inner and outer thicknesses of the tire.

[0034] S2 Outer thickness and inner thickness measurement: As Figure 5 shown, use an ultrasonic flaw detector to measure the thickness from the sidewall 4 corresponding to each detection point to the layer rubber of the reverse-wrapped carcass (recorded as the outer thickness) from the outside of the tire. The measurement points should be the same as those measured in step S1, and record as A1, B1...H1; as Figure 6As shown, use an ultrasonic flaw detector to measure the thickness from the inner side of the tire to the carcass ply rubber corresponding to each detection point (denoted as the inner thickness). The measurement points should be the same as those measured in step S1 and are recorded as A2, B2... H2. When measuring, the thickness value of each detection point should be measured multiple times, and the minimum value should be read.

[0035] S3 Calculate the thickness between the turned-up carcass plies: Calculate the thickness between the turned-up carcass plies at the corresponding position of each detection point according to the data measured in steps S1 and S2. The thickness between the turned-up carcass plies corresponding to the first detection point = A - A1 - A2 - 2d, where d is the diameter of the carcass wire 2; and so on for the thickness between the turned-up carcass plies corresponding to other detection points.

[0036] S4 Determine whether the thickness between the turned-up carcass plies corresponding to each detection point meets the preset standard. The preset standard is the standard value of the thickness between the turned-up carcass plies corresponding to each detection point + tolerance. The standard value is the overall thickness, component thickness, etc. of the tire side 4 to the bead part output during the cross-section design of this tire specification, and a control tolerance is added based on this standard value, that is, the actual size = standard value ± tolerance. The final measured size data within this range is judged as a qualified product, and the rest are judged as suspicious or unqualified products. The tolerances preset by each manufacturer are different. In this comparative example, the tolerance of -1 mm to +2 mm is used as an example for inspection.

[0037] Table 1 shows the standard values and measured values of the cross-section dimensions of the 16.00R25 tire specification in Comparative Example 1:

[0038]

[0039] It can be seen from the data in Table 1 that the thickness between the turned-up carcass plies at some detection positions calculated by the method of the present invention is judged to be abnormal, indicating that the produced finished tires are unqualified products. Subsequently, the tire is cut cross-sectionally, and the thickness of each detection position is actually measured with a ruler. From the measurement results, it can be seen that the actual measured values of the thickness between the turned-up carcass plies at each detection position are slightly different from the values calculated by the calculation formula, and the result of judging whether the thickness between the turned-up carcass plies at each detection position of the tire meets the preset standard based on the actual measured values is the same as the judgment result using the method of the present invention, thus verifying that the inspection procedure of the present invention is reasonable.

[0040] Example 1

[0041] The difference from Example 1 is that in Example 1, the thickest point of the upper rubber core 1 close to the inner side is used as the fitting positioning point (i.e., the G point in Figure 1 ), and a marking line 5 is set at one end of the inner side of the upper rubber core 1 close to the center line of the forming equipment when the upper rubber core 1 is fitted (as shown in Figure 2As shown). First, find the positioning and fitting points of the glue core 1 component according to the requirements of the construction standard, and use a tape measure to measure the position corresponding to the G point on the equipment during fitting to confirm that the preset G point position in the program meets the production requirements. Then, confirm the inner and outer sides of the glue core 1 according to the double-line marking line 5 on the glue core 1 component to avoid incorrect pasting of the inner and outer sides. After confirmation, perform the fitting and pressing of the glue core 1 component, and then perform operations such as pad glue fitting, carcass reverse wrapping, pressing, etc. Then complete the production and vulcanization of the tire embryo.

[0042] Inspect the quality of the reverse-wrapped carcass of the finished tire after vulcanization in Example 1 in the same manner as in Comparative Example 1. Table 2 shows the standard values and measured values of the cross-sectional dimensions of the 16.00R25 specification tires in Example 1:

[0043]

[0044] It can be seen from the data in Table 2 that after the glue core 1 component is correctly fitted, the interlayer thickness of the reverse-wrapped carcass at each detection position calculated by the method of the present invention is judged to be normal, indicating that the produced finished tire is a qualified product. It shows that the process of the present invention can ensure the correct fitting of the glue core 1 component, thereby ensuring the quality of the tire carcass reverse wrapping. Subsequently, the tire is cut cross-sectionally, and the thickness of each detection position is actually measured with a ruler. From the measurement results, it can be seen that the actual measured values of the interlayer thickness of the reverse-wrapped carcass at each detection position are slightly different from the values calculated by the calculation formula, and the result of judging whether the interlayer thickness of the reverse-wrapped carcass at each detection position of the tire meets the preset standard according to the actual measured values is the same as the judgment result using the method of the present invention, thus verifying that the inspection steps of the present invention are reasonable.

[0045] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and all such modifications or substitutions should be within the scope of the present invention. / Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims

1. A process for ensuring the quality of the carcass reverse wrapping of a tire, characterized in that, Take the thickest point near the inner side of the upper rubber core (1) as the fitting positioning point, and set a marking line (5) at one end of the inner side of the upper rubber core (1) close to the center line of the molding equipment when it is fitted; It also includes an inspection procedure, and the inspection procedure includes the following steps: S1 After the tire vulcanization is completed, divide a number of detection points at intervals on the tire sidewall (4) and the outer side of the bead, and measure and record the total tire thickness corresponding to each detection point respectively; S2 Measure and record the thickness from the airtight layer (3) corresponding to each detection point to the carcass ply rubber from the inner side of the tire, and measure and record the thickness from the tire sidewall (4) to the turned-up carcass ply rubber from the outer side of the tire; S3 Calculate the turned-up carcass ply thickness corresponding to each detection point by using the following formula: Turned-up carcass ply thickness = Total tire thickness - Thickness from airtight layer to carcass ply rubber - Thickness from tire sidewall to turned-up carcass ply rubber - 2 × Carcass wire diameter; S4 Judge whether the turned-up carcass ply thickness corresponding to each detection point meets the preset standard.

2. The process for ensuring the quality of the turned-up tire carcass according to claim 1, characterized in that, The marking line (5) adopts a double-line marking line.

3. The process for ensuring the quality of the turned-up tire carcass as claimed in claim 1, characterized in that, Before fitting the upper rubber core (1), confirm the fitting positioning point, and then fit the upper rubber core (1) after confirmation.

4. The process for ensuring the quality of the carcass turn-up of a tire according to claim 1, characterized in that, The preset standard is the standard value + tolerance of the turned-up carcass ply thickness corresponding to each detection point.

5. The process for ensuring the quality of the turned-up tire carcass according to claim 4, characterized in that, The tolerance is -1mm to +2mm.

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