Methods to ensure the correct tire size

Abstract

This invention discloses a method for ensuring the proper placement of tire size markings, relating to the field of tire manufacturing technology. The invention first marks the tire sidewall with graduation lines. After vulcanization, a suitable area for the tire size is identified on the sidewall. Based on the graduation lines in this area, the corresponding position of the sidewall bead plate is located. Two grooves are then designed at the corresponding positions on the sidewall bead plate, thus pressing two marking lines onto the extruded sidewall component, limiting the width of the tire size markings on the sidewall. Finally, light-based markings limit the length of the tire size markings, thereby achieving accurate positioning of the tire size on the sidewall component. Using this method, the position of the vulcanized tire size markings can be effectively identified and fixed, eliminating tire repairs and downgrading caused by marking overprints. This reduces manufacturing costs and allows customers to quickly identify the tire size position, avoiding customer complaints.

Description

Technical Field

[0001] This invention relates to the field of tire manufacturing technology, and specifically to a method for ensuring that the tire size position is appropriate. Background Technology

[0002] Currently, engineering radial tires suffer from issues during production such as inconsistent tire size markings and the tendency for markings to be rubbed on. Tires with rubbed markings require rework, incurring costs and affecting the tire's appearance. Furthermore, inconsistent tire size markings make it difficult to quickly identify tires mounted on the main unit, leading to customer complaints. Therefore, to address these problems, a method is needed to accurately position the rubbed tire size markings on the sidewall during the tire molding process. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method to ensure that the tire number position is appropriate. After adopting the method, the position of the tire number in the vulcanization process can be effectively identified and fixed, eliminating tire repair and downgrading caused by tire number overlap, reducing manufacturing costs, and making it easier for customers to quickly identify the position of the tire number, thus avoiding customer complaints.

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

[0005] To ensure the correct tire size, the following steps are included:

[0006] S1 marks the scale lines on the flat surface of the sidewall component.

[0007] During the tire blank forming process, scale lines are marked on the plane width direction of the sidewall component, covering the entire width of the sidewall component. Then, the marked sidewall component is attached with its plane facing down, and other components are attached and pressed in sequence until the tire blank is formed.

[0008] S2 tire size selection on the sidewall area

[0009] The tire blank is vulcanized. After vulcanization, the tire is removed and the area without any external design structure is identified on the sidewall. The position of the scale line corresponding to the area is then recorded. This step involves observing the sidewall of the vulcanized tire to find blank areas on the sidewall without special external design structures such as lettering, waterproof lines, and tread grooves. This is to facilitate the subsequent positioning of the tire number in these blank areas and prevent the tire number from being improperly positioned on the sidewall, which could damage the external design structures such as lettering, waterproof lines, and tread grooves.

[0010] S3 tire sidewall design

[0011] According to the scale lines recorded in step S2, two scale lines at appropriate positions are selected, and two grooves are added at the positions of the sidewall die plate corresponding to the two scale lines, wherein the distance between the two grooves is not less than the width of the tire number;

[0012] S4 extruding a sidewall component by using the sidewall die plate

[0013] The sidewall component is extruded through the sidewall die plate designed in step S3. During the extrusion of the sidewall rubber material, the grooves are filled with the rubber material to form two protruding identification lines;

[0014] S5 positioning the position of the tire number

[0015] A light mark frame is installed above the vulcanizing manipulator, the light mark frame is designed concentrically with the vulcanizing manipulator, and two laser light marks are designed on the light mark frame, wherein light beams of the laser light marks are parallel to each other and the distance between the two laser light marks is equal to the length of the tire number; when the green tire to be vulcanized is placed below the vulcanizing manipulator, the vulcanizing manipulator grabs the green tire according to process requirements. After the grabbing is completed, the two light beams from the light mark frame above the vulcanizing manipulator and the two identification lines on the sidewall of the green tire below form a "#"-shaped intersection, the tire number is placed at the "□"-shaped position in the middle of the # shape, and operations are performed according to this requirement during production, thereby completing the fixation of the tire number position on the tire.

[0016] Through the above operations, the tire number can be accurately positioned in the area with no special appearance design structures such as fonts, waterproof lines and groove patterns on the sidewall, thereby preventing the problem of tire rework caused by unfixed tire number position and easy character pressing during tire production.

[0017] Preferably, in step S1, scale lines are only marked on the plane of the sidewall component corresponding to the upper mold of the vulcanizing machine. This is because tire numbers are provided on both sidewall components of the tire, the tire number of the lower mold is placed on the lower side plate of the vulcanizing mold, and the lower side plate of the mold is exposed during the green tire loading process in the vulcanization procedure, so that the position where the tire number should be placed on the lower mold sidewall component can be directly identified, and therefore it is not necessary to mark scale lines on the lower mold sidewall component.

[0018] Preferably, in step S1, scale lines are respectively marked at two symmetrical positions on the plane of the sidewall component. There is a certain position deviation within the tolerance range for sidewall positioning during the forming process, therefore marking two groups of scale lines in the circumferential direction can more accurately lock the compliance of the tire number position, and avoid tire rework or degradation caused by vulcanized tire number character pressing, waterproof line pressing and other problems due to the fluctuation of normal sidewall positioning within the tolerance range.

[0019] Preferably, in step S1, when marking scale lines, the interval between each adjacent scale lines is 10 mm.

[0020] Preferably, in step S3, the grooves are V-shaped, have a depth of 0.6-1 mm, and have a width of 1-1.5 mm at the widest position.

[0021] Preferably, in step S3, the distance between the two grooves is 1.2-2 times the width of the tire size, so as to facilitate limiting the tire size to the area between the two marking lines on the tire sidewall.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] This invention first marks the tire sidewall with graduation lines. After vulcanization, a suitable area for the tire size is located on the sidewall. Based on the graduation lines in this area, the corresponding position of the sidewall bead plate is found. Then, two grooves are designed at the corresponding positions on the sidewall bead plate, thereby pressing two marking lines onto the extruded sidewall component, limiting the width area of ​​the tire size on the sidewall. Finally, light-based marking lines are used to limit the length area of ​​the tire size, thus achieving accurate positioning of the tire size on the sidewall component. Using this method, the position of the vulcanized tire size can be effectively identified and fixed, eliminating tire repairs and downgrading caused by tire size overprinting. This reduces manufacturing costs and allows customers to quickly identify the tire size position, avoiding customer complaints. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the tire sidewall of the present invention.

[0025] Figure 2 This is a cross-sectional view of the tire sidewall with two marking lines machined in this invention.

[0026] Figure 3 This is a schematic diagram of the "well" shaped marking lines and light marking lines in this invention.

[0027] In the picture, 1. Tire sidewall; 2. Marking line; 3. Light beam. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention.

[0029] Examples 1-6

[0030] The tire size positions of tires with specifications of 18.00R25, 17.5R25, 12.00R24, 13.00R25, 14.00R25, and 16.00R25 in Examples 1-6 are located using the following method, specifically including the following steps:

[0031] S1 marks the scale lines on the flat surface of component 1 on the sidewall.

[0032] During the tire blank forming process, a measuring tape and a marker are used to mark the plane of the tire sidewall component 1 on the upper mold of the vulcanizing machine (e.g., ...). Figure 1Marked in the width direction as shown, and there are two groups of scale marks, which are respectively located at two symmetrical positions on the plane of the sidewall 1 component. Data is collected at 10 mm intervals along the scale lines, covering the entire width of the sidewall 1 component, then the marked sidewall 1 component is attached with its plane facing downward, and other components such as protective rubber and bead cushion rubber are sequentially attached and pressed until the green tire is formed;

[0033] S2 Selection of tire number position in sidewall 1 area

[0034] The green tire is vulcanized, the tire is taken out after vulcanization is completed, the area without appearance design structure is identified in the sidewall 1 area, and then the position of the corresponding scale line in this area is recorded;

[0035] S3 Structural design of sidewall 1 die plate

[0036] According to the scale lines recorded in step S2, two scale lines at appropriate positions are selected, two V-shaped grooves are added at the positions of the sidewall 1 die plate corresponding to the two scale lines, the depth of the groove is 1 mm, the width at the widest part is 1.5 mm, and the spacing between the two grooves is 1.5 times the width of the tire number;

[0037] S4 Extruding sidewall 1 component by using sidewall 1 die plate

[0038] The sidewall 1 component is extruded through the sidewall 1 die plate designed in step S3. During the extrusion process of the sidewall 1 rubber compound, the grooves are filled with rubber compound to form two raised marking lines 2 (as Figure 2 shown);

[0039] S5 Positioning tire number position

[0040] A light marker holder is installed above the vulcanizing manipulator, the light marker holder is concentrically designed with the vulcanizing manipulator, two laser light markers are designed on the light marker holder, and the light marker beams 3 of the laser light markers are parallel and the spacing is equal to the length of the tire number; when the green tire to be vulcanized is placed below the vulcanizing manipulator, the vulcanizing manipulator grabs the green tire according to process requirements. After grabbing is completed, the two light marker beams 3 above the vulcanizing manipulator and the two marking lines 2 on the sidewall 1 of the green tire below form a "#" shaped intersection (as Figure 3 shown), the tire number is placed at the "□"-shaped position in the middle of the "#" shape, and operations are carried out according to this requirement during production, completing the fixation of the tire number position of the tire.

[0041] In Examples 1-6, the rework rates of tires produced before positioning and after positioning are shown in Table 1:

[0042] Table 1

[0043] Pre-positioning rework rate 1.22％ 0.98％ 1.06％ 0.77％ 1.67％ 1.33％ Rework rate after positioning 0.00％ 0.00％ 0.00％ 0.00％ 0.00％ 0.00％

[0044] As can be seen from Table 1, before the tire manufacturing process was improved by the method of the present invention, the rework rate of vulcanized tire numbers of various specifications was close to 1% or even exceeded 1%. However, after the tire manufacturing process was improved by the method of the present invention, this problem was effectively controlled, the overall appearance qualification rate of the products was greatly improved, and the tire rework cost was greatly reduced.

Claims

1. Method for ensuring the correct positioning of the tyre size on the tyre, characterised in that, Includes the following steps: S1 marks the scale lines on the plane of the sidewall (1) component. During the tire blank forming process, scale lines are marked on the plane width direction of the tire side (1) component. The scale lines cover the entire width of the tire side (1) component. Then, the marked tire side (1) component is attached with its plane facing down, and other components are attached and pressed in sequence until the tire blank is formed. S2 Side (1) Region Tire Size Selection The tire blank is vulcanized. After vulcanization, the tire is removed. The area without an appearance design structure is identified in the tire sidewall (1) area. Then the position of the scale line corresponding to the area is recorded. S3 tire sidewall (1) mouth plate structure design According to the scale lines recorded in step S2, select two scale lines at appropriate positions, and add two grooves at the corresponding tire sidewall (1) beak plate positions of the two scale lines. The distance between the two grooves is not less than the tire width. S4 uses the sidewall die plate to extrude the sidewall (1) component. The sidewall (1) component is extruded through the sidewall die plate designed in step S3. During the extrusion process, the groove of the sidewall (1) rubber is filled with rubber, forming two raised marking lines (2). S5 locates tire size position A light beacon frame is installed above the vulcanizing robot, and the light beacon frame is designed concentrically with the vulcanizing robot. Two laser light beacons are designed on the light beacon frame. The light beams (3) of the laser light beacons are parallel and the spacing is equal to the length of the tire number. When the vulcanized tire blank is placed below the vulcanizing robot, the vulcanizing robot grabs the tire blank. After the grab is completed, the two light beams (3) above the vulcanizing robot and the two marking lines (2) on the side (1) of the tire blank below intersect in a "well" shape. The tire number is placed in the "mouth" shaped position in the middle of the well, thus completing the fixation of the tire number position.

2. The method of claim 1, wherein In step S1, scale lines are marked only on the sidewall (1) component plane of the upper mold of the tire corresponding to the vulcanizing machine.

3. The method for ensuring the appropriate tire size position as described in claim 1, characterized in that, In step S1, scale lines are marked at two symmetrical locations on the plane of the tire sidewall (1) component.

4. The method for ensuring the tire size position is appropriate as described in claim 1, characterized in that, In step S1, when marking the scale lines, the interval between each scale line is 10mm.

5. The method for ensuring the tire size position is appropriate as described in claim 1, characterized in that, In step S3, the groove is V-shaped, with a depth of 0.6-1mm and a width of 1-1.5mm at its widest point.

6. The method for ensuring the tire size position is appropriate as described in claim 1, characterized in that, In step S3, the distance between the two grooves is 1.2-2 times the width of the tire.

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