CN112798182A

CN112798182A - Method for improving unbalance of tire and tire obtained by method

Info

Publication number: CN112798182A
Application number: CN202011491684.1A
Authority: CN
Inventors: 李增平; 徐任春; 吕剑; 张文清; 陈高琪
Original assignee: Zhongce Rubber Group Co Ltd
Current assignee: Zhongce Rubber Group Co Ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-05-14
Anticipated expiration: 2040-12-17
Also published as: CN112798182B

Abstract

The invention belongs to the field of tires, and particularly relates to a method for improving the imbalance of a tire and a tire obtained by the method. A method of improving the imbalance of a tyre, the method comprising one or both of the following steps: firstly, performing out-of-roundness detection on a tire blank, and repairing static unbalance of the tire according to the out-of-roundness detection result of the tire blank; and step two, detecting the unbalance of the tire blank through the tire blank, and repairing the dynamic unbalance of the tire according to the unbalance detection result of the tire blank. The method is used for repairing and realizing the unbalance of the tire through the detection of the tire blank in the tire manufacturing process.

Description

Method for improving unbalance of tire and tire obtained by method

Technical Field

The invention belongs to the field of tires, and particularly relates to a method for improving the imbalance of a tire and a tire obtained by the method.

Background

The present invention relates to a method for manufacturing a tyre, and more particularly to improving the unbalanced mass of a tyre by compensating the unbalanced mass of a (green) blank. Tire imbalance can be divided into static imbalance and dynamic imbalance. In recent years, as road conditions have increased, improvements in vehicle performance have increased, as well as increased demands on comfort from users. A great deal of research shows that the vertical shaking phenomenon of the vehicle at 80-90 km/h is partially caused by poor static balance of tires. The vehicle body or square disk flutters around 35km/h because of poor dynamic balance of tires. For these reasons, tire manufacturers strive to control tire imbalance to a minimum level.

A well-known filling and balancing method commonly used by tire manufacturers is to fill and balance the tire (after vulcanization) with viscous cement (as in the Chinese patent publication No. CN 110003723A). Although the compensation method is effective, the repaired tire can cause serious internal mucilage to fall off in the using process, and poor appearance feeling is caused to users. The method for improving the unbalance of a tire by coating the inside of a tire with the cement is described in detail in "study on tire dynamic balance compensation method" published by Linxiao.

Another common tire imbalance repair improvement is the use of methods to reduce the radial out-of-roundness of the tire tread. The method is introduced in the article "research on tire dynamic balance grinding method". And locally polishing the tire tread near the first harmonic wave of radial out-of-roundness. This method is very effective for improving a tire having a poor static imbalance of the tire, but has a small effect on a tire having a poor dynamic imbalance of the tire, and buffing the tread causes poor appearance. As customers demand premium tires, the buffing mode is increasingly unacceptable.

Disclosure of Invention

In order to solve the above technical problem, the present application aims to provide a method for improving the unbalance of a tire, which is used for repairing and realizing the unbalance of the tire through the detection of a tire blank in the tire manufacturing process.

In order to achieve the above object, the present application adopts the following technical solutions:

a method of improving the imbalance of a tyre, the method comprising one or both of the following steps:

firstly, performing out-of-roundness detection on a tire blank, and repairing static unbalance of the tire according to the out-of-roundness detection result of the tire blank;

and step two, detecting the unbalance of the tire blank through the tire blank, and repairing the dynamic unbalance of the tire according to the unbalance detection result of the tire blank.

Preferably, the method comprises the steps of repairing the blank by detecting out-of-roundness of the blank, and then repairing the blank by detecting out-of-balance of the blank.

Preferably, step one is as follows:

1) producing at least one green tyre according to the process steps;

2) measuring the radial out-of-roundness of the tread of the at least one green tire by laser scanning and decomposing into at least 8 harmonic equations;

3) determining at least one harmonic low point position;

4) the static unbalance of the tire is repaired by adding or removing or re-rolling the rubber strip at the harmonic abnormal position of the tire surface.

Further, step 4) supplement the strip length as:

wherein, RROH_hThe harmonic wave is out-of-roundness harmonic wave, w is the width of the supplementary adhesive tape, rho is the density of the supplementary adhesive tape, t is the thickness of the supplementary adhesive tape, and m is the corresponding mass of the harmonic wave.

Preferably, the numerical value m corresponding to each harmonic of radial out-of-roundness of the green tire is established in advance, and for the repair of multiple harmonics, when the first harmonic is far larger than the multiple harmonics, only the first harmonic needs to be repaired; the subharmonic repair is performed when the multiple harmonics have harmonics greater than one.

Preferably, the second step is as follows:

1) manufacturing at least one tire blank according to the process steps, detecting the imbalance m of two sides of the tire side of the tire blank through imbalance_u and m_lAnd 2) determining the positions of light points on two surfaces, and performing rubberizing strip compensation on the tire side position through unbalance of the two surfaces of the tire side.

Further, the lengths of the two compensation adhesive tapes in the step 2) are respectively as follows:

wherein: w is the width of the supplementary adhesive tape, rho is the density of the supplementary adhesive tape, t is the thickness of the supplementary adhesive tape, R₀Is the inner radius of the tire, R₁A sidewall repair point radius.

Further, the application also discloses a production method of the tire, and the method adopts the method of any one technical scheme to repair the tire blank, and then carries out vulcanization to produce the tire with the unbalance of the tire improved.

Further, the application also discloses a tire which is prepared by the method.

Due to the adoption of the technical scheme, the method is used for repairing and realizing the unbalance of the tire through the detection of the tire blank in the tire manufacturing process. Of course, the present application is not limited to the repair of tire imbalance, and the repair cases are accumulated to build a tire imbalance database to provide the improvement of the previous molding.

Drawings

FIG. 1 shows a process for repairing an imbalance of a green tire.

FIG. 2 is a schematic view of the repair of 205/55R16 green tires.

Detailed Description

The technical solution of the present invention is further described below by specific embodiments.

1. Taking 205/55R16 tire blank as an example, firstly, out-of-roundness detection is carried out, the first harmonic low point of radial out-of-roundness is measured to be (6,70 degrees), and the known rubber strip W: 6cm, ρ: 1.25g/cm³And t: 0.15cm, the first harmonic corresponds to mass m: 2g/mm, calculated from the data for rubberizing strips at 70 degrees of the tread as follows:

and (3) after the adhesive tape is adhered, performing out-of-roundness detection on the tire blank, wherein the detection result is (3,65 degrees), the out-of-roundness first harmonic of the tire blank is reduced to some extent, and finally detecting the static unbalance of the tire after the tire blank is vulcanized. The measurement results showed 5g, and the static unbalance of the specification averaged 15g, which is 10g lower than the average value.

2. And the other tire of the specifications is subjected to out-of-roundness detection, the high point of the first harmonic of the radial out-of-roundness is (8,120 degrees), the tire is rolled at the high point (120 degrees), the first harmonic of the out-of-roundness is detected after rolling (4,115 degrees), finally, the static unbalance amount is 7g after vulcanization, and the ratio to the average value is reduced by 8 g.

3. And carrying out unbalance detection on the other tire blank in the specification, wherein the test result is (30,130 degrees), (35,100 degrees), and respectively attaching rubber strips at 130 degrees of the left tire side and 100 degrees of the right tire side according to data. From the known strip W: 6cm, ρ: 1.15g/cm³，t：1.5mm，R₀：202mm，R1：260mm，m_u:30g，m₁35g, calculated as follows:

and (3) carrying out an unbalance test on the tire blank after the adhesive tape is attached, wherein the result is (10,125 degrees), (7,112 degrees), and finally detecting the unbalance condition of the tire after the tire blank is vulcanized. The results showed the final unbalance of the tire (9,120 °) (8,105 °).

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, including any reference to the above-mentioned embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of improving the unbalance of a tyre, characterized in that it comprises one or both of the following steps:

2. The method of claim 1, wherein the method comprises repairing the green tire after the non-circularity test and then the imbalance test.

3. Method according to claim 1 or 2, characterized in that step one is as follows:

1) producing at least one green tyre according to the process steps;

3) determining at least one harmonic low point position;

4. Method according to claim 3, characterized in that step 4) the supplementary strip length is:

5. The method according to claim 3, characterized in that the value of each harmonic of radial out-of-roundness of the green tyre is established in advance corresponding to m, and for the repair of multiple harmonics, when the first harmonic is far larger than the multiple harmonics, only the first harmonic needs to be repaired; the subharmonic repair is performed when the multiple harmonics have harmonics greater than one.

6. Method according to claim 5, characterized in that step 4) the supplementary strip length is:

7. Method according to claim 1 or 2, characterized in that step two is as follows:

1) manufacturing at least one tire blank according to the process steps, detecting the imbalance m of two sides of the tire side of the tire blank through imbalance_u and m_l，

2) And determining the positions of the light points on the two surfaces, and performing rubberizing strip compensation on the tire side position by means of unbalance of the two surfaces of the tire side.

8. The method according to claim 7, wherein the lengths of the two compensating strips of step 2) are respectively:

9. A method of producing a tyre, characterised in that the tyre blank is repaired and subsequently vulcanised by a method as claimed in any one of claims 1 to 8 to produce a tyre in which the unbalances of the tyre are ameliorated.

10. A tire, characterized in that it is obtained by the process according to claim 9.