All-steel radial tire body cord shoulder bending multiple control method

Abstract

The invention provides an all-steel radial tire body cord shoulder bending multiple control method which comprises the following steps: processing white rubber into a rubber sheet by using an open mill, and isolating two sides of the rubber sheet by using plastic cloth liners; cutting the rubber sheet into rubber strips with specified sizes; when the tire blank is formed, the rubber strip is attached outwards along the tire body reverse wrapping end point, and the position of the rubber strip is marked on the lower side of the tire side edge portion through a white crayon; carrying out X-ray detection after the tire blank is vulcanized, and confirming the shoulder bending multiple of the tire body cord thread; the method has the advantages that the problem of the bending multiple of the shoulder of the tire body cord thread can be accurately judged by performing section cutting and observing the state of the white rubber at the marking position of the white crayon, accurate adjustment is performed according to the problem, the tire body cord thread is ensured to be bent by 1-2 times without thread display in the tire, the service performance of the tire is improved, and the service life of the tire is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of tire manufacturing, and in particular to a method for controlling the bending multiple of a shoulder of a carcass cord of an all-steel radial tire. Background Art

[0002] The bending multiple of the tire carcass cord shoulder not only affects the factory qualification rate but also directly affects the performance. If the bending multiple is too small, there will be visible line defects in the tire, and the tire with less visible line is not easy to be found, and it is easy to flow into the market, and the possibility of tire blowout during use is increased; if the bending multiple is too large, the factory scrap rate will increase, and the tire durability will also decrease with the increase of the bending multiple, reducing the tire service life.

[0003] Traditional control methods include controlling the stretch rate of the carcass cords and observing the bending of the cords through cross-section dissection, which can control the bending multiples of the carcass cords, but can only roughly control and cannot achieve precision. The present invention can directly perform countermeasure control by observing the state of the color glue, ensuring that the carcass cords are bent 1-2 times without the appearance of tire visible lines. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the above-mentioned technology and to provide a method for controlling the bending multiple of the shoulder of the carcass cord of an all-steel radial tire.

[0005] To this end, the present invention provides a method for controlling the bending multiple of the shoulder of the carcass cord of an all-steel radial tire, comprising the following steps:

[0006] S1. Processing the white rubber into a film using an open mixing mill, wherein both sides of the film are isolated by a plastic mat;

[0007] S2, cutting the film into strips of specified size;

[0008] S3. When the tire is formed, the rubber strip is attached outward along the end point of the tire body, and the position of the rubber strip is marked on the lower side of the tire side edge with a white wax pen;

[0009] S4. After the tire is vulcanized, X-ray inspection is performed to confirm the bending multiple of the tire body cord shoulder;

[0010] S5. Perform cross-section cutting at the position marked by the white crayon to observe the state of the white glue.

[0011] Preferably, the bonding method of the white glue is: tearing off the plastic mat on one side of the rubber strip, bonding it outwards along the end point of the tire body without gap, compacting it with a pressure roller after bonding, and tearing off the plastic mat on the other side after compaction.

[0012] Preferably, the white glue state includes state one, state two and state three, state one is that the white glue is connected to the upper end point of the carcass turn-up end point and the bending multiple of the carcass cord shoulder after X-ray detection is 1-2 times; state two is that the white glue is connected to the upper end point of the carcass turn-up end point but the bending multiple of the carcass cord shoulder after X-ray detection is more than 3 times; state three is that the white glue is separated from the upper end point of the carcass turn-up end point and the bending multiple of the carcass cord shoulder after X-ray detection is 1-2 times, state one is a normal state, and state two and state three are abnormal states.

[0013] Preferably, the adjustment method of the second state is to reduce the distance from the center point of the crown to the inner end point of the wire ring, and repeat steps S1-S5 until the bending multiple of the shoulder of the carcass cord is 1-2 times.

[0014] Preferably, the adjustment method of state three is to increase the distance from the center point of the crown to the inner end point of the wire ring, and repeat steps S1-S5 until the white glue is connected to the upper end point of the tire body turn-up end point.

[0015] Preferably, the thickness of the film is 1 mm, and the film is cut into the strips with a width of 5 mm and a length of 100 mm using a wallpaper knife and a steel ruler.

[0016] The beneficial effects of the present invention are as follows: the present invention provides a method for controlling the bending multiple of the shoulder of the carcass cord of an all-steel radial tire, which has the following beneficial effects.

[0017] ⑴ Through X-ray inspection of the tire and checking the connection between the white rubber of the tire section and the upper end point of the tire body turn-up end point, the problem of the tire body cord shoulder bending multiple can be accurately determined, and precise adjustments can be made according to the problems, ensuring that the tire body cord is bent 1-2 times without the tire inner line, thereby improving the performance of the tire and extending the service life of the tire;

[0018] (2) It avoids the waste of time and resources caused by peeling off the inner liner and measuring the bending multiple of the carcass cord after cutting the tire section, and effectively solves the problem that the bending multiple measured after dissecting the section is only a result, and it is impossible to clearly judge whether the bending is caused by the twitching of the carcass during vulcanization or the bending is caused by the excessive distance from the center point of the given crown to the inner end point of the wire ring during processing;

[0019] ⑶ This method can be used in the tire sample or tire design stage to ensure the stability of the tire after it is put into production, ensure that the tire design is consistent with the actual performance of the finished tire, and improve the company's reputation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 2 is a schematic structural diagram of the carcass turn-up end point in an embodiment of the present invention;

[0021] Figure 2 This is a diagram of the state of the white glue after cutting the cross section in the embodiment of the present invention;

[0022] Figure 3 is a diagram of the sidewall fitting in an embodiment of the present invention;

[0023] Figure 4 is a lamination diagram of the inner lining layer in an embodiment of the present invention;

[0024] Figure 5 is a lamination diagram of a reinforcement layer in an embodiment of the present invention;

[0025] Figure 6 is a diagram of the bonding of a carcass in an embodiment of the present invention;

[0026] Figure 7 is a fitting diagram of a shoulder pad in an embodiment of the present invention;

[0027] Figure 8 is a diagram showing the position of a tire bead in an embodiment of the present invention;

[0028] Fig. 9 This is a rendering of the effect of attaching white glue to the tire blank after molding in an embodiment of the present invention.

[0029] Markings in the figure: 1. End point of carcass turnup; 2. White rubber; 3. Sidewall; 4. Drum plate; 5. Fan-shaped block; 6. Inner liner; 7. Reinforcement layer; 8. Carcass; 9. Shoulder pad; 10. Bead. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercial products unless otherwise specified.

[0031] Example:

[0032] like Figure 1 As shown, the present invention provides a method for controlling the bending multiple of the shoulder of the carcass cord of an all-steel radial tire, comprising the following steps:

[0033] S1. The laboratory processes the white vulcanized rubber into a film with a thickness of 1 mm using an XK-250 open mill. The two sides of the film are isolated by plastic mats to prevent the film from sticking and deforming;

[0034] S2, using a wallpaper knife and a steel ruler to cut the film into the strips with a width of 5 mm and a length of 100 mm;

[0035] S3, when the tire is formed, the rubber strip is attached outward along the tire body turn-up end point 1, and the position of the rubber strip is marked on the lower side of the sidewall 3 with a white wax pen;

[0036] S4. After the tire is vulcanized, X-ray inspection is performed to confirm the bending multiple of the tire body cord shoulder;

[0037] S5. Use a cross-section cutting machine to perform cross-section cutting at the white crayon mark position. After the cross-section is polished, observe the state of the white glue 2.

[0038] Furthermore, the bonding method of the white glue 2 is: tear off the plastic mat on one side of the rubber strip, and bond it outwards without gap along the end point 1 of the tire body, and use a pressure roller to compact it after bonding to ensure that it is firmly bonded to the tire body 8, and after compaction, tear off the plastic mat on the other side.

[0039] Furthermore, the state of the white glue 2 includes state one, state two and state three. State one means that the white glue 2 is connected to the upper end point of the carcass turn-up end point 1 and the bending multiple of the carcass cord shoulder after X-ray detection is 1-2 times, and it can be determined that L1=L1', wherein L1 represents the distance from the designed crown center point to the inner end point of the wire ring, and L1' represents the distance from the crown center point to the inner end point of the wire ring of the finished tire; state two means that the white glue 2 is connected to the upper end point of the carcass turn-up end point 1 but the bending multiple of the carcass cord shoulder after X-ray detection is more than 3 times, and it can be determined that L1>L1'; state three means that the white glue 2 is separated from the upper end point of the carcass turn-up end point 1 and the bending multiple of the carcass cord shoulder after X-ray detection is 1-2 times, and it can be determined that L1<L1'; ​​state one is a normal state, and state two and state three are abnormal states. The states of the white glue 2 in state one and state two are as follows: Figure 2 As shown in part A, the state of the white glue 2 in state three is as follows Figure 2 As shown in part B.

[0040] If L1>L1', X-ray inspection after tire vulcanization will reveal that the carcass cord is bent, and as the difference increases, the cord bending multiple increases; if L1<L1', the tire outline will be smaller than the finished tire outline. During the tire vulcanization process, under the extrusion of the vulcanization bladder, the tire will increase to fill the mold cavity. At this time, the tire bead outer carcass cord will be pulled into the tire, that is, the carcass turn-up end point 1 moves downward, so that the inner width of the steel wire ring increases by the inner carcass length L1', ensuring that the tire is enlarged. During the process of the carcass pulling into the tire, the tire transition layer rubber will also move through the carcass toward the shoulder pad 9 under the extrusion of the vulcanization bladder, resulting in tire inner line.

[0041] Furthermore, the adjustment method of the state 2 is to reduce the distance L1 from the designed crown center point to the inner end point of the wire ring, and repeat steps S1-S5 until the bending multiple of the carcass cord shoulder is 1-2 times.

[0042] Furthermore, the adjustment method of state three is to increase the distance L1 from the designed crown center point to the inner end point of the wire ring, and repeat steps S1-S5 until the white glue 2 is connected to the upper end point of the carcass turn-up end point 1 and the carcass cord shoulder bending multiple is 1-2 times.

[0043] Furthermore, the process of forming the tire blank is as follows:

[0044] First, if Figure 3 As shown, the sidewall 3 is bonded to the bonding drum composed of the drum plate 4 and the sector block 5 according to the positioning standard;

[0045] Second, if Figure 4 As shown, the inner liner 6 is bonded to the bonding drum on one side of the sidewall 3 according to the positioning standard;

[0046] Third, if Figure 5 As shown, the reinforcing layer 7 is attached to the top of the sidewall 3 and the inner liner 6;

[0047] Fourth, if Figure 6 As shown, the carcass 8 is attached to the reinforcing layer 7;

[0048] Fifth, if Figure 7 As shown, the shoulder pad 9 is attached to the outer side of the top of the carcass 8;

[0049] Sixth, if Figure 8 As shown, the bead 10 is placed on top of the carcass 8 above the sector block 5;

[0050] Seventh, if Fig. 9 As shown, the sector block 5 rises to compact and tighten the tire bead 10 and the material thereunder, thereby providing a closed space for subsequent tire blank shaping.

[0051] The present application adds a step of laminating white glue 2 to the tire body edge on the basis of normal tire manufacturing. After the tire is vulcanized, the cross section is dissected and whether the bead positioning setting value (L1) is appropriate is determined by the state of the colored glue on the tire cross section. By adjusting L1, it is ensured that the carcass cord is bent 1-2 times without the appearance of tire inner line.

[0052] In the description of the present invention, it is necessary to understand that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A method for controlling the bending multiple of the shoulder of the carcass cord of an all-steel radial tire, characterized in that: The steps include: S1. Processing the white rubber into a film using an open mixing mill, wherein both sides of the film are isolated by a plastic mat; S2, cutting the film into strips of specified size; S3. When the tire is formed, the rubber strip is attached outward along the end point of the tire body, and the position of the rubber strip is marked on the lower side of the tire side edge with a white wax pen; S4. After the tire is vulcanized, X-ray inspection is performed to confirm the bending multiple of the tire body cord shoulder; S5. Perform cross-section cutting at the position marked by the white crayon to observe the state of the white glue.

2. A method for controlling the bending multiple of the carcass cord shoulder of an all-steel radial tire according to claim 1, characterized in that: The bonding method of the white glue is: tearing off the plastic mat on one side of the rubber strip, bonding it outwards along the end point of the tire body without gap, compacting it with a pressure roller after bonding, and tearing off the plastic mat on the other side after compaction.

3. The method for controlling the bending multiple of the carcass cord shoulder of an all-steel radial tire according to claim 1, characterized in that: The white glue state includes state one, state two and state three. State one is that the white glue is connected to the upper end point of the carcass turn-up end point and the bending multiple of the carcass cord shoulder after X-ray detection is 1-2 times; state two is that the white glue is connected to the upper end point of the carcass turn-up end point but the bending multiple of the carcass cord shoulder after X-ray detection is more than 3 times; state three is that the white glue is separated from the upper end point of the carcass turn-up end point and the bending multiple of the carcass cord shoulder after X-ray detection is 1-2 times. State one is a normal state, and state two and state three are abnormal states.

4. A method for controlling the bending multiple of the carcass cord shoulder of an all-steel radial tire according to claim 3, characterized in that: The adjustment method of the second state is to reduce the distance from the center point of the crown to the inner end point of the wire ring, and repeat steps S1-S5 until the bending multiple of the shoulder of the carcass cord is 1-2 times.

5. The method for controlling the bending multiple of the carcass cord shoulder of an all-steel radial tire according to claim 3, characterized in that: The adjustment method of the state three is to increase the distance from the center point of the crown to the inner end point of the wire ring, and repeat steps S1-S5 until the white glue is connected to the upper end point of the tire body turn-up end point.

6. The method for controlling the bending multiple of the shoulder of the carcass cord of an all-steel radial tire according to claim 1, characterized in that: The thickness of the film is 1 mm, and the film is cut into the adhesive strips with a width of 5 mm and a length of 100 mm using a wallpaper knife and a steel ruler.

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