Method for ensuring building quality of radial tire

Abstract

The invention discloses a method for guaranteeing the forming quality of a radial tire, and relates to the technical field of tires. According to the technical scheme, the method comprises the steps that (1) the edge of a capsule drum chuck is designed to be in a circular arc shape, the thickness of the edge of the chuck is 2-4 mm, and the inner width of the chuck is 90-110% of the width of a tire blank seam allowance; (2) detecting and confirming that the positions of the left capsule drum and the right capsule drum are symmetrical before each shift of production or after failure repair of the capsule drums; (3) before the tire tube is shaped, the ring parts on the two sides of the tire tube are wrapped with plastic cloth liners; and 4) ensuring the same diameter and consistent inflation pressure of inflation pipelines of capsules on the left and right sides of the capsule drum. After the method is adopted, the problems of tire blank ring part extrusion and tire cylinder position instability caused by unreasonable process and equipment design in the forming and manufacturing process in the production process can be effectively solved, and the quality problems of ring part edge emergence, belt ply eccentricity, tire blank deformation and the like of a product caused by the problems can be avoided; and the stability and conformity of the quality of the radial tire product are improved.

Description

Technical Field

[0001] The invention relates to the technical field of tires, and in particular to a method for ensuring the molding quality of a radial tire. Background Art

[0002] In the current production process of radial mining tires, we are facing a series of severe quality problems, which are mainly caused by process defects in the molding and manufacturing process and inadequate equipment design. Specifically, they are manifested in the following aspects:

[0003] First, due to the unreasonable process of the molding and manufacturing process, the tire bead is unevenly squeezed during the manufacturing process, which not only affects the overall structural stability of the tire, but also easily causes the tire bead to come out of the edge. This phenomenon not only reduces the appearance of the tire, but more seriously affects the tire's load-bearing capacity and service life.

[0004] Secondly, the inadequacy of equipment design leads to unstable tire barrel position, which in turn leads to belt eccentricity. Belt eccentricity will cause uneven wear of the tire during driving, reduce the service life of the tire, and may even cause traffic accidents.

[0005] In addition, tire deformation is also caused by unreasonable molding and manufacturing process and equipment design. Tire deformation will directly affect the driving performance of the tire, increase energy consumption and vibration during driving, and reduce ride comfort.

[0006] Based on these problems, there is a quality risk of critical waste products, which are prone to problems such as bead lines, shoulder delamination or crown delamination during use. Bead lines will cause excessive stress on the bead during driving, thereby accelerating tire damage; shoulder delamination and crown delamination will seriously affect the tire's grip and stability, increasing the risk of traffic accidents.

[0007] To address the above problems, it is necessary to optimize the molding and manufacturing process, improve the rationality of equipment design, ensure uniform extrusion of the tire embryo ring and stable position of the tire barrel; strengthen the inspection of critical waste and defective products to ensure that quality problems are effectively controlled, thereby improving the overall quality level of mining radial tires and providing strong guarantees for the development of my country's mining industry. Summary of the invention

[0008] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a method for ensuring the molding quality of radial tires, which can effectively improve the problems of tire bead extrusion and unstable tire tube position caused by unreasonable molding and manufacturing process technology and equipment design in the production process, avoid the quality problems of the product such as bead edge extrusion, belt eccentricity and tire deformation, and improve the stability and compliance of the radial tire product quality.

[0009] The technical solution of the present invention is:

[0010] A method for ensuring the quality of radial tire molding, 1) designing the edge of the bladder drum chuck to be an arc shape, and the thickness of the chuck edge is 2-4mm, and the inner width of the chuck is 90-110% of the width of the tire blank mouth;

[0011] 2) Before each shift or after the capsule drum failure is repaired, check and confirm that the positions of the left and right capsule drums are symmetrical;

[0012] 3) Before the tire tube is shaped, use plastic pads to wrap the rings on both sides of the tire tube;

[0013] 4) Ensure that the diameters of the capsule inflation pipes on the left and right sides of the capsule drum are the same and the inflation pressures are consistent.

[0014] Preferably, in step 2), the distance difference between the two capsule drums and the center line of the forming drum is controlled to meet a preset standard, that is, the positions of the two capsule drums are confirmed to be symmetrical, otherwise the machine is shut down for rectification.

[0015] Preferably, the preset standard is that the distance difference is ≤ 2 mm.

[0016] Preferably, in step 3), the thickness of the plastic mat is 0.1-0.15 mm.

[0017] Preferably, in step 3), when the plastic mat wraps the tire tube, the width of the plastic mat inside the tire tube exceeds the inner end point of the sub-mouth, and the width of the plastic mat outside the tire tube is lower than the end point of the tire body turn-up.

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

[0019] By adopting the method of the present invention, the problems of tire embryo bead extrusion and unstable tire tube position caused by unreasonable molding and manufacturing process technology and equipment design in the production process can be effectively improved, and quality problems such as bead edge defect, belt eccentricity and tire embryo deformation caused by these problems can be avoided, thereby improving the stability and compliance of radial tire product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the improved capsule drum chuck in the present invention.

[0021] Figure 2 It is a schematic diagram of the distance between the two capsule drums and the center line of the forming drum in the present invention.

[0022] Figure 3 This is one of the structural schematic diagrams of the capsule drum chuck before improvement in Comparative Example 1.

[0023] Figure 4This is the second structural schematic diagram of the capsule drum chuck before improvement in Comparative Example 1.

[0024] In the figure, 1. chuck; 2. capsule drum. DETAILED DESCRIPTION

[0025] In order to enable persons skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0026] Example 1

[0027] The method for ensuring the quality of radial tire molding in this embodiment is as follows:

[0028] 1) If Figure 1 As shown, the edge of the capsule drum chuck 1 is designed to be a uniformly transitioned arc shape, and the thickness of the edge of the chuck 1 is E = 2mm, and the inner width D of the chuck 1 is 90% of the width of the embryo mouth;

[0029] 2) Before each shift or after the capsule drum failure is repaired, check and confirm that the positions of the left and right capsule drums 2 are symmetrical. The specific operation is as follows: Figure 2 As shown, the distance difference between the two capsule drums 2 and the center line of the forming drum |FG| is controlled to be ≤2mm, otherwise the machine will be shut down for rectification;

[0030] 3) Before the tire tube is finalized, a 0.1mm thick plastic mat is used to wrap the rings on both sides of the tire tube. When the plastic mat is wrapped around the tire tube, the width of the plastic mat inside the tire tube exceeds the inner end point of the sub-mouth, and the width of the plastic mat outside the tire tube is lower than the end point of the tire body wrapping;

[0031] 4) Ensure that the diameters of the pipes for inflating the capsules on the left and right sides of the capsule drum are the same and the inflation pressure is consistent. There must be no leakage of the pipes or capsules on one side, so as to ensure that the two capsules are of the same size and inflated synchronously, so that the capsules reach the same size after inflation.

[0032] Example 2

[0033] The method for ensuring the quality of radial tire molding in this embodiment is as follows:

[0034] 1) If Figure 1 As shown, the edge of the capsule drum chuck 1 is designed to be a uniformly transitioned arc shape, and the thickness of the edge of the chuck 1 is E=3mm, and the inner width D of the chuck 1 is 100% of the width of the embryo mouth;

[0035] 2) Before each shift or after the capsule drum failure is repaired, check and confirm that the positions of the left and right capsule drums 2 are symmetrical. The specific operation is as follows: Figure 2 As shown, the distance difference between the two capsule drums 2 and the center line of the forming drum |FG| is controlled to be ≤2mm, otherwise the machine will be shut down for rectification;

[0036] 3) Before the tire tube is finalized, a 0.13mm thick plastic mat is used to wrap the rings on both sides of the tire tube. When the plastic mat is wrapped around the tire tube, the width of the plastic mat inside the tire tube exceeds the inner end point of the sub-mouth, and the width of the plastic mat outside the tire tube is lower than the end point of the tire body turn-up;

[0037] 4) Ensure that the diameters of the pipes for inflating the capsules on the left and right sides of the capsule drum are the same and the inflation pressure is consistent. There must be no leakage of the pipes or capsules on one side, so as to ensure that the two capsules are of the same size and inflated synchronously, so that the capsules reach the same size after inflation.

[0038] Example 3

[0039] The method for ensuring the quality of radial tire molding in this embodiment is as follows:

[0040] 1) If Figure 1 As shown, the edge of the capsule drum chuck 1 is designed to be a uniformly transitioned arc shape, and the thickness of the edge of the chuck 1 is E = 4mm, and the inner width D of the chuck 1 is 110% of the width of the embryo mouth;

[0041] 2) Before each shift or after the capsule drum failure is repaired, check and confirm that the positions of the left and right capsule drums 2 are symmetrical. The specific operation is as follows: Figure 2 As shown, the distance difference between the two capsule drums 2 and the center line of the forming drum |FG| is controlled to be ≤2mm, otherwise the machine will be shut down for rectification;

[0042] 3) Before the tire tube is finalized, a 0.15mm thick plastic mat is used to wrap the rings on both sides of the tire tube. When the plastic mat is wrapped around the tire tube, the width of the plastic mat inside the tire tube exceeds the end point of the sub-mouth, and the width of the plastic mat outside the tire tube is lower than the end point of the tire body wrapping;

[0043] 4) Ensure that the diameters of the pipes for inflating the capsules on the left and right sides of the capsule drum are the same and the inflation pressure is consistent. There must be no leakage of the pipes or capsules on one side, so as to ensure that the two capsules are of the same size and inflated synchronously, so that the capsules reach the same size after inflation.

[0044] Comparative Example 1

[0045] The difference from Example 1 is that Figure 3-4 As shown, in step 1), the edge C of the capsule drum chuck 1 is designed to be right-angled, and the thickness A of the edge of the chuck 1 is 15 mm, and the inner width B of the chuck 1 is 50% of the width of the embryo mouth.

[0046] Comparative Example 2

[0047] The difference from Example 2 is that the operation of step 2) is not performed.

[0048] Comparative Example 3

[0049] The difference from Example 3 is that the operation of step 3) is not performed.

[0050] Comparative Example 4

[0051] The difference from Example 3 is that in step 4), the diameters of the pipes for inflating the capsules on the left and right sides of the capsule drum are different and the inflation pressures are inconsistent.

[0052] The radial tires produced in Examples 1-3 and Comparative Examples 1-4 were tested for performance, and the test results are shown in Table 1:

[0053] Table 1 Performance test results of radial tires of Examples 1-3 and Comparative Examples 1-4

[0054]

[0055] As can be seen from Table 1, the radial tire produced by the method of the present invention can effectively improve the problems of tire embryo bead extrusion and unstable tire tube position caused by unreasonable molding and manufacturing process technology and equipment design during the production process, avoid the quality problems of the product such as bead edge, belt eccentricity and tire embryo deformation, and improve the stability and compliance of radial tire product quality.

Claims

1. A method for ensuring the quality of radial tire molding, characterized in that: 1) The edge of the capsule drum chuck (1) is designed to be arc-shaped, and the thickness of the edge of the chuck (1) is 2-4 mm, and the inner width of the chuck (1) is 90-110% of the width of the embryo mouth; 2) Before each shift of production or after the capsule drum failure is repaired, check and confirm that the positions of the left and right capsule drums (2) are symmetrical; 3) Before the tire tube is shaped, use plastic pads to wrap the rings on both sides of the tire tube; 4) Ensure that the diameters of the capsule inflation pipes on the left and right sides of the capsule drum are the same and the inflation pressures are consistent.

2. The method for ensuring the quality of radial tire molding according to claim 1, characterized in that: In step 2), the distance difference between the two capsule drums (2) and the center line of the forming drum is controlled to meet a preset standard, that is, the positions of the two capsule drums (2) are confirmed to be symmetrical, otherwise the machine is shut down for rectification.

3. The method for ensuring the quality of radial tire molding as claimed in claim 2, characterized in that: The preset standard is that the distance difference is ≤ 2 mm.

4. The method for ensuring the molding quality of a radial tire according to claim 1, characterized in that: In step 3), the thickness of the plastic mat is 0.1-0.15 mm.

5. The method for ensuring the molding quality of a radial tire according to claim 1, characterized in that: In step 3), when the plastic mat wraps the tire tube, the width of the plastic mat inside the tire tube exceeds the end point position inside the sub-mouth, and the width of the plastic mat outside the tire tube is lower than the end point position of the tire body turn-up.

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