Method and device for detecting thickness of upper coating and lower coating of semi-finished wire cord fabric

Abstract

The invention discloses a method and device for detecting the thickness of upper and lower coating of semi-finished wire cord fabric, and the method comprises the following steps: S1, clamping and fixing the two ends of a wire cord fabric sample, enabling the middle part of the sample to form a suspended detection region, and measuring the initial total thickness of the suspended detection region; s2, stripping the upper coating rubber and the lower coating rubber in the suspended detection area step by step through a heating stripping knife, and correspondingly measuring a first residual thickness and a second residual thickness; s3, the thickness value of the upper coating glue and the thickness value of the lower coating glue are calculated, the qualification of the current sample is judged, and the thickness of the upper coating glue meets a formula; the thickness of the lower coating meets a formula; the coating thickness difference meets a formula. Accurate quantitative detection of the upper coating thickness, the lower coating thickness and the thickness difference of the semi-finished wire cord fabric is realized, and the industrial problem that accurate values cannot be obtained by a traditional visual inspection method is thoroughly solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile tires, and in particular to a method and a device for detecting the thickness of upper and lower rubber coatings of semi-finished steel cords. Background Art

[0002] Explanation of terms: Steel cord fabric: Steel cords are woven into a cloth-like structure according to a certain density and arrangement, and are evenly covered with rubber on both sides through a calendering process to form a composite material with a certain thickness.

[0003] Thickness of rubber covering on steel wire: the distance from the upper end point of the steel wire to the upper surface of the cord in the semi-finished steel cord.

[0004] Thickness of rubber coating under steel wire: the distance from the lower end point of the steel wire to the lower surface of the cord in the semi-finished steel cord.

[0005] For radial tires, steel cord is an important component. As the core load-bearing material of the tire, it is mainly used in the carcass and belt components.

[0006] The specific production process of steel cord is as follows: First, the 1# and 2# rollers of the S-type four-roll special calender are used to extrude the rubber material to produce an upper rubber sheet of a certain thickness, and the 3# and 4# rollers are used to extrude the rubber material to produce a lower rubber sheet of a certain thickness; then, the 2# and 3# rollers are used to squeeze the upper and lower rubber sheets into the gaps between the arranged steel wires and cover the upper and lower surfaces of the steel wires to form steel cord.

[0007] The thickness of the rubber coating on the upper and lower surfaces of the steel wires in the steel cord has an extremely important impact on the performance of the finished tire, because unreasonable thickness of the rubber coating will directly affect the adhesion between the layers of adjacent components. Insufficient interlayer adhesion will cause safety accidents such as delamination and blowout during the use of the finished tire.

[0008] However, currently, manufacturers in the industry primarily monitor the total thickness of the cord fabric, rather than the thickness of the upper and lower rubber coatings on the semi-finished steel cord fabric. This is because there is currently no method in the industry to detect the thickness of the upper and lower rubber coatings on steel cord fabrics. The reason for this is that after the steel wires are coated with rubber, the thickness of the upper and lower rubber coatings cannot be directly measured. Tire factories only qualitatively observe the difference in the upper and lower rubber coatings on the steel wires by feel or visual inspection, and then adjust the thickness settings of the upper and lower rubber sheets on the four-roll calender. This makes it impossible to accurately detect the rubber coating thickness. In particular, for products with asymmetric rubber coating thickness (e.g., if the design requires the upper rubber coating to be 0.2mm thicker than the lower rubber coating), the production site cannot guarantee the thickness difference and cannot meet the design requirements.

[0009] It can be seen that it is very important to study a method to accurately detect the thickness of the rubber covering the steel wire and the thickness of the rubber covering the steel wire in the semi-finished steel cord. Summary of the Invention

[0010] The technical problem to be solved by the present invention is how to detect the thickness of the upper covering rubber and the lower covering rubber in the semi-finished steel cord.

[0011] In a first aspect of the present invention, in order to solve the above technical problems, a method for detecting the thickness of the upper and lower rubber coatings of a semi-finished steel cord is provided, comprising the following steps: S1. Clamp and fix the two ends of the steel cord sample to form a suspended detection area in the middle of the sample, and measure the initial total thickness of the suspended detection area ; S2, peeling off the upper and lower adhesive layers of the suspended detection area in steps by using a heated peeling knife, and measuring the first remaining thickness accordingly. With the second remaining thickness ; S3. Calculate the thickness of the upper cover glue and the lower cover glue, and determine the eligibility of the current sample, where: The thickness of the overlying glue satisfies the formula ; The thickness of the lower cover glue satisfies the formula ; The difference in coating thickness satisfies the formula .

[0012] Furthermore, the projection positions of the peeling surfaces of the upper cover glue and the lower cover glue coincide with each other.

[0013] Furthermore, the heating temperature of the stripping knife is 50° C.–80° C.; and the stripping gas pressure is 0.1 MPa–0.2 MPa.

[0014] Furthermore, the length of the peeling surface where the upper cover adhesive and the lower cover adhesive are peeled off is 18-22 mm.

[0015] A second aspect of the present invention provides a detection device for implementing the method, comprising a clamping mechanism for clamping the two ends of a steel cord sample so that the middle of the sample is suspended in the air; the clamping mechanism is further provided with: A stripping assembly includes an upper stripping knife and a lower stripping knife, wherein the upper stripping knife and the lower stripping knife are driven by an upper pressure cylinder and a lower pressure cylinder respectively to strip the upper and lower coatings of the sample; The thickness measuring component is used to measure the remaining thickness of the sample after peeling.

[0016] Furthermore, it also includes a control module, which is configured to calculate the thickness of the upper cover glue, the lower cover glue and the difference in cover glue thickness, and determine the eligibility of the sample.

[0017] Furthermore, the thickness measuring component is arranged on the central axis of the clamp mechanism and is perpendicular to the sample.

[0018] Preferably, the thickness measuring component is a top-down facing laser sensor.

[0019] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: The present invention fixes the steel cord sample by suspended clamping, uses a hot knife to peel off the upper and lower rubber layers in steps, and cooperates with three laser thickness measurements to achieve accurate quantitative detection of the upper rubber thickness, lower rubber thickness and thickness difference of the semi-finished steel cord, completely solving the industry problem that traditional visual inspection methods cannot obtain accurate values. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a flowchart of the overall process disclosed in the embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure disclosed in an embodiment of the present invention.

[0022] In the picture: 000, sample; 100. Clamping mechanism; 101. Clamping cylinder; 110. Thickness measuring assembly; 121. Upper stripping knife; 122. Lower stripping knife; 123. Upper pressure cylinder; 124. Lower pressure cylinder. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] The present invention aims to provide a method for detecting the thickness of the upper and lower rubber covers of semi-finished steel cords, thereby realizing accurate quantitative detection of the upper and lower rubber cover thicknesses and thickness difference of semi-finished steel cords, and completely solving the industry problem that traditional visual inspection or qualitative feel cannot obtain accurate numerical values.

[0025] See also Figure 1 , the method is described in detail below.

[0026] S1. Clamp and fix the two ends of the steel cord sample to form a suspended and non-interference test area in the middle of the sample 000, and measure the initial total thickness of the suspended test area. .

[0027] In this embodiment, the suspended peeling design avoids squeezing interference of the adhesive covering the other non-operating surface, and the subsequent peeling operation only acts on the center of the suspended area.

[0028] S2, peeling off the upper and lower adhesives of the suspended detection area step by step by using a heated peeling knife, and measuring the first remaining thickness accordingly With the second remaining thickness .

[0029] It should be emphasized that the projection positions of the peeling surfaces of the upper and lower cover adhesives coincide with each other, and the three thickness measurements are required to be completed in the same suspended detection area to avoid distortion of the measurement values ​​due to position offset.

[0030] Optionally, the heating temperature of the stripping knife is 50°C–80°C to ensure that the adhesive layer is completely removed without residue, thereby reducing measurement errors; the stripping air pressure is 0.1MPa–0.2Mpa; and the stripping surface length of the upper and lower adhesive layers is 18–22mm.

[0031] S3. Calculate the thickness of the upper and lower covering adhesives and determine the eligibility of the current sample, where: The thickness of the overlying glue satisfies the formula ; The thickness of the lower cover glue satisfies the formula ; The difference in coating thickness satisfies the formula .

[0032] The present invention uses a hot knife to peel off the upper and lower rubber layers in steps and cooperates with three laser thickness measurements to achieve the thickness of the rubber layer on the semi-finished steel cord for the first time. , thickness of bottom cover glue and coating thickness difference The measured data is uploaded to the MES system in real time to drive adjustments to the calendering process, thereby improving the adhesion between tire layers and effectively eliminating safety hazards such as delamination and tire blowouts caused by uneven rubber coating thickness.

[0033] The present invention also provides a detection device for implementing the above method, see Figure 2 , mainly includes a clamping mechanism 100, which clamps and fixes the two ends of the steel cord sample under the drive of the clamping cylinder 101, so that the middle of the sample 000 is suspended in the air; the clamping mechanism 100 is also provided with a peeling component and a thickness measuring component 110.

[0034] In this embodiment, the stripping assembly includes an upper stripping blade 121 and a lower stripping blade 122, driven by an upper pressure cylinder 123 and a lower pressure cylinder 124, respectively, to strip the upper and lower adhesive layers from sample 000. A thickness measurement assembly 110 is positioned perpendicular to the sample and located along the central axis of the fixture mechanism. This assembly measures the remaining thickness of sample 000 after stripping. Preferably, this assembly is a vertically directed laser sensor.

[0035] In a further solution of this embodiment, a control module is also included, which is configured to perform calculations on the thickness of the upper cover glue, the lower cover glue and the difference in cover glue thickness, and determine the eligibility of the current sample 000.

[0036] Among the optional solutions, the use of a cold knife (temperature <30°C) in combination with an adhesion-enhancing coating can also achieve adhesive layer peeling; and the use of ultrasonic sensors instead of laser sensors, etc., also fall within the scope of protection of this technical solution.

[0037] The technical concept provided by the present invention is described in detail below with reference to the specific sample 000.

[0038] First, use electric scissors to take a 35cm long and 30mm wide cord strip along the direction of the steel wire on the semi-finished steel cord, and mark the upper and lower surfaces of the cord.

[0039] Next, the test specifications are selected on the device's host computer. The two ends of the test sample are placed in the device's fixtures. The fixtures, operated by a pneumatic cylinder, clamp the sample tightly, leaving the center suspended. The total thickness of the sample is measured using a top-down laser sensor. The pneumatic cylinder pressure is between 0.5 MPa and 0.7 MPa.

[0040] The upper stripping blade of the detection device is moved to the sample surface by the upper pressure cylinder and driven by a servo motor to peel the sample, moving it to the side. The remaining thickness of the sample is detected by upper and lower opposing laser sensors. The cylinder pressure is between 0.1 MPa and 0.2 MPa, and the stripping blade is heated by an electric heating device at a temperature controlled between 50°C and 80°C. The peeling speed is 10 cm / min, and the peeling length is approximately 20 mm.

[0041] Similarly, the lower stripping blade of the inspection device is moved to the sample surface by the downward pressure of the cylinder. Driven by a servo motor, it peels the sample at a position opposite the upper stripping surface, then moves to the side. The remaining thickness of the sample is measured using upper and lower opposing laser sensors. Similarly, the cylinder pressure is kept between 0.1 MPa and 0.2 MPa, and the stripping blade is heated by an electric heater at a temperature controlled between 50°C and 80°C. The stripping surface is approximately 20 mm long.

[0042] Finally, the detection device calculates the thickness of the upper and lower rubber covers of the cord and their difference data based on the theoretical formula, automatically determines whether it is qualified according to the selected specifications, and uploads the data to the MES system.

[0043] In order to verify the effectiveness and accuracy of the design ideas provided by the present invention, the following experimental tests are carried out: The sample data involved in the experiment is as follows: the diameter of the semi-finished steel cord is 1.16mm, the total thickness is designed to be 2.40mm, and the thickness of the upper and lower rubber coatings of the steel wire are designed to be 0.62mm. The data of the actual production test according to this technical solution are shown in Table 1 below: Table 1

[0044] Through data analysis, the total thickness of the steel cord is close to the designed total thickness, but the actual thickness of the upper and lower rubber covers is quite different from the design target. 0.07mm smaller than the design value, It is 0.08mm larger than the design value, that is, the rubber covering thickness of the steel cord is thin on the upper side and thick on the lower side, so the semi-finished steel cord is unqualified.

[0045] Further adjustments were made to the unqualified semi-finished steel cord fabric. Specifically, an investigation of the production site revealed that during the calendering process of the steel cord fabric, the average thickness of the upper film rolled between the calender rollers 1# and 2# was 0.85mm, while the average thickness of the lower film rolled between the calender rollers 3# and 4# was 1.03mm. The upper film thickness was much thinner than the lower film thickness. Therefore, the upper film thickness of the calender roller was adjusted to 0.92mm, and the lower film thickness was adjusted to 0.96mm. Based on this adjustment, the re-sampling test data is shown in Table 2 below: Table 2

[0046] It can be seen that after adjustment, the upper and lower rubber covering thicknesses of the semi-finished steel cord are more in line with the design value.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for detecting the thickness of the upper and lower rubber coatings of semi-finished steel cord fabrics, characterized in that: The following steps are involved: S1. Clamp and fix the two ends of the steel cord sample to form a suspended detection area in the middle of the sample, and measure the initial total thickness of the suspended detection area ; S2, peeling off the upper and lower adhesive layers of the suspended detection area in steps by using a heated peeling knife, and measuring the first remaining thickness accordingly. With the second remaining thickness ; S3. Calculate the thickness of the upper cover glue and the lower cover glue, and determine the eligibility of the current sample, wherein: The thickness of the overlying glue satisfies the formula ; The thickness of the lower cover glue satisfies the formula ; The difference in coating thickness satisfies the formula .

2. The method for detecting the thickness of the upper and lower rubber coatings of semi-finished steel cord according to claim 1, characterized in that: The projection positions of the peeling surfaces of the upper cover glue and the lower cover glue coincide with each other.

3. The method for detecting the thickness of the upper and lower rubber coatings of semi-finished steel cord according to claim 1, characterized in that: The heating temperature of the stripping knife is 50° C.–80° C.; the stripping gas pressure is 0.1 MPa–0.2 MPa.

4. The method for detecting the thickness of the upper and lower rubber coatings of semi-finished steel cord fabrics according to claim 1, characterized in that: The length of the peeling surface between the upper cover adhesive and the lower cover adhesive is 18-22 mm.

5. A detection device for implementing the method according to any one of claims 1 to 4, characterized in that: The clamp mechanism is used to clamp the two ends of the steel cord sample so that the middle of the sample is suspended in the air. The clamp mechanism is also provided with: A stripping assembly includes an upper stripping knife and a lower stripping knife, wherein the upper stripping knife and the lower stripping knife are driven by an upper pressure cylinder and a lower pressure cylinder respectively to strip the upper and lower coatings of the sample; The thickness measuring component is used to measure the remaining thickness of the sample after peeling.

6. The device for detecting the thickness of the upper and lower rubber coatings of semi-finished steel cord according to claim 5, characterized in that: The method further includes a control module configured to calculate the thickness of the upper cover glue, the lower cover glue and the difference in cover glue thickness, and determine the eligibility of the sample.

7. The device for detecting the thickness of the upper and lower rubber coatings of semi-finished steel cord according to claim 5, characterized in that: The thickness measuring component is arranged on the central axis of the clamp mechanism and is perpendicular to the sample.

8. The device for detecting the thickness of the upper and lower rubber coatings of semi-finished steel cord according to claim 5 or 7, characterized in that: The thickness measuring component is a top-bottom facing laser sensor.

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