CN210337460U

CN210337460U - Steel wire carcass ST tire

Info

Publication number: CN210337460U
Application number: CN201920982437.8U
Authority: CN
Inventors: 张峰; 徐伟; 王君; 韩磊; 刘杰; 李勇; 戚顺青; 李晓红; 孙桂芹; 马丽华; 魏颖; 苏国庆; 徐超
Original assignee: Qingdao Doublestar Tire Industry Co Ltd
Current assignee: Qingdao Doublestar Tire Industry Co Ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-04-17
Anticipated expiration: 2029-06-26

Abstract

The utility model discloses a steel wire matrix ST tire, itThe tire longitudinal section comprises a crown positioned on the outer side of the upper part, a tire shoulder connected with the crown, a tire side connected with the tire shoulder, a tire bead connected with the lower part of the tire side, and a tire body positioned on the inner side of the tire section, wherein the tire body comprises a tire body cord fabric, the tire body cord fabric is made of single-layer steel cord, the steel cord fabric comprises a plurality of steel wires, the strength index of the tire body cord fabric is 50000-²‑130Nmm²The diameter of the steel cord is 0.55mm-0.8mm, and the diameter of the steel wire is less than 0.3 mm. The utility model provides a seam allowance that exists when the steel wire is used for the tire matrix come to nothing and stress concentration problem, but this product intensity is big, the nature controlled, the comfort can be good, rolling resistance is little, the durability is good, industrial production.

Description

Steel wire carcass ST tire

Technical Field

The utility model belongs to steel wire matrix tire field especially relates to a steel wire matrix ST tire.

Background

The ST tire is a special trailer tire used on roads, and mainly refers to a light-weight heavy-duty tire with a tire flat ratio of more than 60 series and a relatively low speed level. ST tire matrix structure in the market generally adopts body materials such as polyester fiber, nylon, rayon, aramid fiber, can provide comparatively excellent resistant year of tire, wear-resisting, but simultaneously because the flat rate is high, the travelling comfort is relatively poor. The weight of the tire is large, which causes high cost and high rolling resistance, and the impact resistance is weak, so that the problem of collision and bulge is easy to occur. Meanwhile, only one or two layers of carcass cords are used as supports on the side wall of the existing ST tire, so that the impact resistance of the tire is weak, and the problem of collision and bulging is easy to occur.

Chinese patent CN201610951286 discloses an all-steel mud tire which uses a layer of steel cord to replace three layers of nylon or polyester materials of the existing mud tire, and improves the strength, impact resistance and durability of the tire.

However, when the steel wire is used for tire carcass materials, the problems of large bending rigidity and strong rebound resilience of the steel wire easily cause seam allowance hollowing and stress concentration, and the service life of the tire is influenced.

SUMMERY OF THE UTILITY MODEL

Weak point to prior art exists, the utility model aims to solve the technical problem that the seam allowance that prior art can't solve the steel wire and exist when being used for the tire matrix comes to the sky and stress concentration problem, can't realize the problem of the industrial production of steel wire matrix tire, but provide a intensity big, the nature controlled, the comfort can be good, rolling resistance is little, the durability is good, industrial production's steel wire matrix ST tire.

For solving the technical problem, the utility model discloses a technical scheme be:

the utility model provides a steel wire casing ST tire, the vertical section of tire including the child hat that is located the upper portion outside, with the tire shoulder that the child hat links to each other, with the side wall that the tire shoulder links to each other, with the tire bead that the side wall lower part links to each other to and be located the inboard casing of tire section, the casing includes casing curtain cloth, casing curtain cloth is made by individual layer steel cord, steel cord includes many steel wires, the powerful index of casing curtain cloth is 50000 one and 70000N one/dm, steel cord's breaking force is 400N-850N, steel cord's bending rigidity is 70Nmm2-130Nmm2, steel cord's diameter is between 0.55mm-0.8mmm, the steel wire diameter is less than 0.3 mm.

Preferably, the tire bead comprises a steel wire ring, the circumference of the steel wire ring is coated with apex, the apex radially extends from the lower end point of the apex to the upper end point of the apex, the tire body is overturned to the tire side by winding the bottom of the steel wire ring and then radially extends to the tire body turn-up end point, a tackifying rubber sheet is arranged between the tire body and the apex, and the tire body turn-up end point is connected with the apex through the tackifying rubber sheet.

Preferably, the tackifying film comprises a tackifying film inner end point positioned on the inner side of the triangular glue and a tackifying film outer end point positioned on the outer side of the triangular glue, the radial height of the tackifying film inner end point is higher than the radial height of the triangular glue end point, the radial distance between the tackifying film inner end point and the triangular glue lower end point is not less than 5mm, and the radial distance between the tackifying film inner end point and the triangular glue end point is not less than 10 mm; the radial height of the outer end point of the tackifying film is not lower than that of the carcass turn-up end point.

Preferably, a reinforcing layer is arranged between the tire body and the tire side, the lower end of the reinforcing layer is positioned at a lower positioning point of the reinforcing layer, the upper end of the reinforcing layer is positioned at an upper positioning point of the reinforcing layer, and a tire body turnup end point is positioned between the lower positioning point of the reinforcing layer and the upper positioning point of the reinforcing layer along the radial direction; the radial distance between the lower positioning point of the reinforcing layer and the turnup end point of the tire body is 10-20 mm; the radial height of a positioning point on the reinforcing layer is higher than that of an end point on the apex, and the radial distance between the positioning point on the reinforcing layer and the end point on the apex is greater than 10 mm; the reinforcing layer forms an angle of 0-55 degrees with the circumference of the tire.

Preferably, the radial height of the upper end point of the apex is higher than that of the tire body turn-up end point, the radial distance between the upper end point of the apex and the tire body turn-up end point is greater than 10mm, the thickness of the apex at the joint of the apex and the tire body turn-up end point is not less than 2mm, and the thickness of the tackifying rubber sheet is 0.5-2 mm.

Preferably, the tyre further comprises a rim protection lower end point which is positioned on the tyre side and connected with a rim, and the radial distance between the tyre body turn-up end point and the rim protection lower end point is less than 15 mm.

Preferably, the radial height of the upper end point of the apex is lower than that of the tire body turn-up end point, the radial distance between the upper end point of the apex and the tire body turn-up end point is greater than 10mm, and the thickness of the tackifying film is 1.0-4.0 mm.

Preferably, the distance between the inner surfaces of the tire body positioned at two sides of the steel wire ring at the turn-up end point of the tire body is 2.0-5.0 mm; the distance between the outer surface of the tire body positioned outside the bead ring and the outer surface of the tire side at the turn-up end point of the tire body is 2.5-10 mm.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the utility model provides a steel wire carcass ST tire, which can obviously improve the safety intensity of the ST tire, thereby further reducing the risk of damage of the tire after collision in the running process;

2. compared with the tire made of other fiber materials, the ST tire has the advantages that the material cost is lower, the oil consumption is reduced by 2 to 4 percent in hundred kilometers, and the low-carbon environmental protection is facilitated;

3. the utility model provides a steel wire matrix ST tire, the utility model discloses a tire removes the ST tire of replacing other fiber material to make, travelling in-process travelling comfort, control the performance and promote, dry land braking distance improves to some extent.

Drawings

Fig. 1 is a schematic structural diagram of a steel wire carcass ST tire provided in embodiment 1 of the present invention;

fig. 2 is a schematic structural view of a tire shoulder portion of a steel wire carcass ST tire provided in embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a tire bead of a steel wire carcass ST provided in embodiment 1 of the present invention;

fig. 4 is a schematic structural view of a bead provided with a reinforcing layer in a steel wire carcass ST tire according to embodiment 1 of the present invention;

fig. 5 is a schematic structural view of a tire bead of a steel wire carcass ST provided in embodiment 2 of the present invention;

fig. 6 is a schematic structural view of a tire bead of a steel wire carcass ST provided in embodiment 3 of the present invention;

fig. 7 is a partial enlarged view of a bead structure a of a steel carcass ST tire provided in embodiment 3 of the present invention;

fig. 8 is a schematic view of a tire forming process of a steel wire carcass ST provided in embodiments 4 to 5 of the present invention;

fig. 9 is a schematic view of a tire forming process of a steel wire carcass ST provided in embodiments 6 to 7 of the present invention;

in the above figures: 1. a crown; 2. tire shoulders; 3. a sidewall; 4. a bead; 41. a bead ring; 42. triangular glue; 421. a lower apex point; 422. the upper end point of the triangular glue; 43. tackifying the film; 431. the inner end point of the tackifying film; 432. the outer end point of the tackifying film; 44. a reinforcing layer; 441. a lower locating point of the reinforcing layer; 442. positioning points on the reinforcing layer; 45. the rim protects the lower end point; 5. a carcass; 51. a carcass turnup end point; 6. an inner liner layer; 7. a belt ply; 8. a crown band; 9. molding glue; 10. a carcass drum; 11. a turn-up rod; 12. a finger shaped sheet; 13. a ring buckling disc; 14. turning and packaging the capsules; 15. and (6) a PA component.

Detailed Description

The present invention is specifically described below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in fig. 1, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1: as shown in figure 1, the utility model provides a steel wire carcass ST tire, tire longitudinal section is including the child crown 1 that is located the upper portion outside, the tire shoulder 2 that links to each other with child crown 1, the side wall 3 that links to each other with tire shoulder 2, the tire bead 4 that links to each other with side wall 3 lower part, and be located the tire casing 5 of tire section inboard, tire casing 5 includes the carcass curtain cloth, the carcass curtain cloth is made by the individual layer steel cord, the steel cord includes many steel wires, the strength index of carcass curtain cloth is 50000 one and 70000N one/dm, the breaking force of steel cord is 400N-850N, the bending rigidity of steel cord is 70Nmm2-130Nmm2, the diameter of steel cord is between 0.55mm-0.8mmm, the steel wire diameter is less than 0.3 mm. As shown in FIG. 2, the tire further comprises a belt layer 7, a molding compound 9 is arranged between the belt layer 7 and the tire body 5, and a crown strip 8 is arranged on the inner side of the tire crown 1.

The steel wire used as the material of the tire body 5 has the advantages of enhancing the strength of the tire, improving the impact resistance of the tire and prolonging the service life of the tire body 5. However, the steel wire has the characteristics of higher bending rigidity and high rebound resilience, so that the steel wire carcass 5 tire obtained by the conventional tire structure and production process has the problems of high production and manufacturing difficulty, low yield and poor comfort. Therefore, in order to obtain a wire carcass ST tire having excellent performance, capable of realizing industrial production, and high yield, it is necessary to overcome many technical difficulties. The selection of the material specifically includes the selection of the breaking force, the bending rigidity and the strength index of the steel cord.

As for the breaking force, the breaking force of the steel wire determines the strength of the carcass 5 made of the steel wire, and the higher the breaking force is, theoretically, the tire made cannot fail when bearing higher loads; under the same wire diameter, the breaking force of a common steel wire is about 3-6 times of that of polyester, so if the breaking force is simply seen, a single-layer steel wire carcass 5 used on the passenger tire can replace 1-3 layers of polyester carcass 5; because TBR (radial ply tire) mainly aims at bearing and abrasion resistance, and PCR (passenger car radial tire) mainly aims at comfort, control, movement and safety performance, the product performance requirements are ensured as much as possible, and the basic requirements of the product on strength are considered to reduce the breaking force of steel wires; reducing the breaking force means that a thinner wire diameter of the steel cord is required, since the carbon content of the raw material wire rod of the steel cord is substantially constant, approximately between 0.6% and 0.9%.

Regarding the bending stiffness, the bending stiffness of the steel cord is related to the wire diameter and the number of strands of the steel wire, and is not directly corresponding to the carbon content of the steel wire; the bending rigidity, namely the bending difficulty of the steel wire, is important for the cutting of the cutting process and the reverse wrapping of the forming process; the bending rigidity determines the possibility that the steel wire can be normally produced in a factory in a batch mode, and the normal batch production of products cannot be realized when the bending rigidity is too large or too small.

Regarding the strength index, the strength index in the present invention refers to the product of breaking force and rolling density, and different products, such as series tires of ST, HP, SUV, AT, MT, etc., can be limited by different strength indexes; the strength index is too small, the safety performance of the product cannot be guaranteed, the strength index is too large, the performance is wasted, and the cost is wasted.

In the embodiment, the strength index of the tire body cord fabric is specifically limited to 50000-70000N/dm, the breaking force of the steel cord is 400N-850N, the bending rigidity of the steel cord is 70Nmm2-130Nmm2, the diameter of the steel cord is 0.55mm-0.8mmm, and the diameter of the steel cord is less than 0.3mm, so that the comfort, operation, control, movement and safety of the steel cord ST tire are ensured on the premise of improving the strength, impact resistance and load-carrying performance of the steel cord ST tire. The determination of the parameters realizes the material selection standard in the industrial production process of the steel wire carcass ST tire, and has important significance for the industrial production of the steel wire carcass ST tire.

As shown in fig. 3, the tire bead 4 comprises a bead ring 41, the bead ring 41 is coated with an apex 42 on the circumference, the apex 42 extends from an apex lower end 421 to an apex upper end 422 in the radial direction, the tire body 5 is turned over to the tire side 3 around the bottom of the bead ring 41 and then extends to a tire body turning-up end 51 in the radial direction, a tackifying rubber sheet 43 is arranged between the tire body 5 and the apex 42, and the tire body turning-up end 51 is connected with the apex 42 through the tackifying rubber sheet 43. When the steel wire is used as a material of the tire body 5, the steel wire has the problems of higher bending rigidity and high rebound resilience, and the problem of poor viscosity between the tire body 5 and the steel wire ring 41 exists, so that the phenomenon of seam allowance hollowing is easily caused, and the quality of the tire is influenced. The tackifying rubber sheet 43 is arranged between the tire body 5 and the triangular rubber 42, so that the steel wire resilience difficulty is increased, the adhesiveness between the triangular rubber 42 and the tire body 5 is increased, the low-heat generation and deflection resistance effect is realized, and the service performance of the tire under a complex condition is improved. It should be noted that, in this embodiment, the tire body turn-up end point 51 is further limited to be connected with the apex 42 through the tackifying film 43, because the tire body 5 has the problems of large bending rigidity and high resilience when being formed and turned up, if the tire body 5 is directly contacted with the apex 42, the seam part of the tire blank stored for 2-6h will be empty under the condition of constant temperature and constant humidity, which is not beneficial to the storage of the tire blank; by adding the tackifying film 43 between the apex 42 and the tire body 5, the storage time of the tire blank is prolonged to 16-20h, the storage time of the tire blank is prolonged, the appearance quality of the tire blank is improved, and the problem of seam allowance void is relieved.

In order to further increase the difficulty of steel wire springback and improve the adhesiveness between the apex 42 and the tire body 5, the tackifying film 43 comprises a tackifying film inner end point 431 positioned on the inner side of the apex 42 and a tackifying film outer end point 432 positioned on the outer side of the apex 42, the radial height of the tackifying film inner end point 431 is higher than that of an apex 422, the radial distance between the tackifying film inner end point 431 and an apex lower end point 421 is not less than 5mm, and the radial distance between the tackifying film inner end point 431 and the apex 422 is not less than 10 mm; the radial height of the tackified film outer end point 432 is not lower than the radial height of the carcass turnup end point 51. The arrangement of the outer end point 432 of the tackifying film ensures that the tackifying film 43 is attached to or wraps the carcass 5, is beneficial to increasing the resilience difficulty of the steel wire and prevents the seam allowance from being empty. In order to ensure the dimensional stability of the tackifying film 43 in the production process and have a stronger tackifying effect, the shore hardness of the tackifying film 43 is 65-78.

As shown in fig. 4, in order to ensure that the transition of the stress-strain at the carcass turnup end 51 is smooth and improve the durability of the tire, a reinforcing layer 44 is disposed between the carcass 5 and the sidewall 3, the lower end of the reinforcing layer 44 is located at a lower positioning point 441 of the reinforcing layer, the upper end of the reinforcing layer 44 is located at an upper positioning point 442 of the reinforcing layer, and the carcass turnup end 51 is located between the lower positioning point 441 of the reinforcing layer and the upper positioning point 442 of the reinforcing layer along the radial direction; the radial distance between the lower positioning point 441 of the reinforcing layer and the turn-up end point 51 of the tire body is 10-20 mm; the radial height of the positioning point 442 on the reinforcing layer is higher than that of the end point 422 on the apex triangularly shaped adhesive, and the radial distance between the positioning point 442 on the reinforcing layer and the end point 422 on the apex triangularly shaped adhesive is more than 10 mm; the reinforcing ply 44 is at an angle of 0-55 degrees to the circumference of the tire. It should be noted that, in the tire, if the hardness or stress of the product is not uniform, the tire is easily damaged at the uneven point of the transition, the tire is repeatedly deformed during the running, and the early damage is easily caused at the uneven point of the stress transition. The carcass turnup end 51 of the steel carcass 5 belongs to a stress concentration point, and the hardness difference between the steel wire and the surrounding material is large, so that the reinforcing layer 44 is required to perform hardness transition. In addition, the embodiment specifically defines the end point position of the reinforcing layer 44, because the arrangement mode of the end point of the reinforcing layer 44 directly affects whether the reinforcing layer 44 can smooth the critical factor of stress-strain transition at the carcass turn-up end point 51, and the embodiment specifically defines the end point position of the reinforcing layer 44, on one hand, the implementability of the scheme is realized, on the other hand, the hooping of the carcass turn-up end point 51 is facilitated, the rebound is reduced, the steel wire carcass turn-up end point 51 is wrapped by the reinforcing layer 44, the shear stress is reduced, the early damage of the tire is prevented, and the service life of the tire is prolonged. As the material of the reinforcing layer 44, nylon 6, nylon 66, polyester, steel wire, or the like can be used. This embodiment achieves the feasibility of the tire building process by defining the reinforcement layer 44 to be at an angle of 0-55 ° to the tire circumference, because in practice, if the angle is 90 °, turn-up cannot be achieved on a one-step building machine due to too large circumferential tightening force.

Example 2: as shown in fig. 5, the present embodiment provides a steel carcass ST tire, wherein the radial height of the upper end point 422 of the apex is higher than the radial height of the turn-up end point 51 of the carcass, the radial distance between the upper end point 422 of the apex and the turn-up end point 51 of the carcass is greater than 10mm, the thickness of the apex 42 at the connection point with the turn-up end point 51 of the carcass is not less than 2mm, and the thickness of the tackifying rubber sheet 43 is 0.5-2 mm. Considering that the transverse shearing force of the carcass turn-up end point 51 is large, the thickness of the apex rubber 42 at the joint of the apex rubber upper end point 422, the carcass turn-up end point 51 and the carcass turn-up end point 51 is limited, and the cutting of the inner rubber under the action of stress strain is avoided. Through the design, the steel wire tire body 5 can prevent the apex 42 from being broken under the hard impact of the tire under the high-speed running condition of the tire, and the running safety of the tire is improved. In order to meet the thickness requirement of the apex 42 and avoid cutting of the inner rubber material under stress, the shore hardness of the apex 42 is 72-92. In order to avoid the early damage of the bead caused by the excessive shearing force of the carcass turnup point 51 and the ply, the thickness of the tackified rubber sheet 43 is limited to 0.5 to 2 mm.

Further, the tyre further comprises a rim protection lower end point 45 which is positioned on the tyre side 3 and connected with a rim, and the radial distance between the tyre body turning-up end point 51 and the rim protection lower end point 45 is less than 15 mm. The bead 4 structure in the steel carcass ST tire of this embodiment is a steel carcass ST tire bead 4 structure for rim protection, and by defining the radial distance between the carcass turnup point 51 and the rim protection lower point 45 to be less than 15mm, cutting of the outer side rubber under stress strain is avoided. Through the design, the inner side of the tire body turn-up end point 51 is ensured to be the apex 42, the outer side is a composite point of the wear-resistant rubber and the tire side 3 rubber, the transition of the stress from hard to soft is favorable for stress dispersion, and the service life of the tire is prolonged.

Example 3: as shown in fig. 6, this embodiment provides another steel wire carcass ST tire, the radial height of the upper end point 422 of the apex is lower than the radial height of the carcass turn-up end point 51, the radial distance between the upper end point 422 of the apex and the carcass turn-up end point 51 is greater than 10mm, and the thickness of the tackifying rubber sheet 43 is 1.0-4.0 mm. Considering that the transverse shearing force of the carcass turnup end point 51 is large, the embodiment limits the triangular upper end point 422 and the steel wire carcass turnup end point 51, and avoids cutting of inner rubber under the action of stress strain. Through the design, the inner side of the tire body turn-up end point 51 is ensured to be the apex 42, the outer side is a composite point of the wear-resistant rubber and the tire side 3 rubber, the transition of the stress from hard to soft is favorable for stress dispersion, and the service life of the tire is prolonged. In order to avoid the early damage of the bead caused by the excessive shearing force of the carcass turnup point 51 and the ply, the thickness of the tackified rubber sheet 43 is limited to 1.0 to 4.0 mm.

As shown in fig. 7, the distance between the inner surfaces of the carcass 5 on both sides of the bead ring 41 at the carcass turn-up end point 51 is 2.0 to 5.0 mm; the distance between the outer surface of the carcass 5 located outside the bead ring 41 and the outer surface of the sidewall 3 at the carcass turn-up end point 51 is 2.5 to 10 mm. It should be noted that the distance d in the figure between the inner surfaces of the carcass 5 on both sides of the bead ring 41 at the carcass turn-up end 51 is₁The distance indicated, the distance between the outer surface of the carcass 5 located outside the bead ring 41 and the outer surface of the sidewall 3 at the carcass turn-up point 51 is d in the figure₂The indicated distance.

Example 4: as shown in fig. 8, the present invention further provides a manufacturing process of the steel wire carcass ST tire according to any of the above embodiments, including a cutting process and a forming process,

the cutting process comprises cutting, cutting and connecting;

the cutting comprises: pressing the wirecord fabric by a cloth pressing device, and then cutting the wirecord fabric by a rectangular knife; the rectangular cutter comprises an upper rectangular cutter and a lower rectangular cutter; the rectangular cutter face is an alloy cutter face; the Rockwell hardness of the rectangular cutter surface is HRC28-HRC 45; the horizontal clearance between the upper rectangular cutter and the lower rectangular cutter is less than 1.5 wires;

the joint includes: the cut wirecord fabric is adsorbed by a magnet holder to be turned and conveyed to a splicing device for splicing; adjusting the gap between the feeding and the delivering to 1.5-2.5mm, and adjusting the sewing pressure of the upper and lower jointers to 0.15-0.25 Mpa;

the molding process comprises the following steps: fitting, ring buckling, presetting, turning up the tire body 5 and tire unloading;

the attaching comprises attaching the PA component 15, attaching the reinforcing layer 44 and attaching the steel wire matrix 5; after the steel wire carcass 5 is attached and the joint is finished, the rear press roll extends to a specified position to press the steel wire carcass 5, the carcass drum 10 rotates at the rotating speed of 80 +/-10 r/min, the pressure of the rear press roll is kept at 2-2.5bar, and the translation rolling is outwards carried out according to the set transverse speed of 5-15mm/sec until the rolling at the end point of the carcass 5 is finished.

The cutting procedure cuts the steel wire, which is realized by mutually cutting the steel cord through an upper guillotine and a lower guillotine (similar to a pair of scissors), the diameter of the steel wire is thicker, the rigidity of the steel wire is high, and the cutting is facilitated; otherwise, it is difficult; different procedures have different requirements on steel cords during forming, and when the tyre body 5 is connected, the tyre body 5 is connected through a special tyre body 5 stitching device to butt the tyre body 5 (similar to a zipper); the thicker the wire diameter of the steel wire cord, the higher the rigidity, the easier the joint, and on the contrary, the joint is not easy; the requirements of the process on the steel wire are consistent with the requirements of cutting; secondly, the requirements of the turn-up procedure on the wire diameter and the rigidity of the steel wire are opposite, the thicker the wire diameter is, the higher the rigidity is, the higher the bending rigidity is, and the more difficult the turn-up is, and meanwhile, after the turn-up, the rebound resilience of the steel wire can enable the steel wire carcass 5 and parts such as the bead filler 42 to be delaminated, so that a defective product is formed; and the thinner the wire diameter of the steel wire, the smaller the rigidity, the lower the bending rigidity, the easier the turning-up, the longer the storage period of the green tire, and the more beneficial to the stability of the quality of the formed green tire.

The requirements for the steel cord in the comprehensive cutting process, the carcass 5 splicing process and the turn-up process, in order to improve the comprehensive performance of tire molding, the wire diameter of the carcass 5 steel cord selected in the embodiment is less than 0.8 mm; and the wire diameter of the steel wire cord of the carcass 5 is less than 0.8mm, the cutting is difficult, the production stability is not high, and the automatic production is difficult to realize, but if the steel wire cord with the wire diameter of more than 0.8mm is used as the carcass 5, the production cost is high, the turn-up is difficult, the product performance is excessive, and meanwhile, the fatigue and the comfort are poor due to the large rigidity of the steel wire cord, so that the PCR product performance is influenced.

In the steel cord fabric woven by the steel cord in the embodiment, the wire diameter of the steel cord is less than 0.8 mm; the embodiment provides a cutting process of a steel cord fabric with the wire diameter of the steel cord below 0.8mm, when the steel cord fabric formed by the steel cord with the wire diameter below 0.8mm is cut, a rectangular knife with a knife surface with Rockwell hardness of HRC28-HRC45 is selected for cutting, and the smoothness of a cut is effectively guaranteed; preferably, the rectangular knife is a titanium alloy cutting knife with Rockwell hardness HRC 30. The reason for selecting the titanium alloy cutter is as follows: the titanium alloy has very high strength, the tensile strength is 686-1176MPa, and the density is only about 60 percent of that of the steel; the hardness is higher; the elastic modulus is low and is about half of that of a common steel knife; the titanium alloy cutter has the following outstanding advantages when being applied to cutting the steel cord fabric: the deformation coefficient is small, the deformation coefficient is smaller than or close to 1, the sliding friction of the steel wire on the cutter surface is greatly increased, and the cutting effect is enhanced; the shearing force in unit area is large, and the shearing force in unit contact area is greatly increased due to the extremely short contact length of the steel wire and the cutter face, so that the cutting quality is ensured. In addition, when cutting is performed in the embodiment, the horizontal gap between the upper rectangular cutter and the lower rectangular cutter is smaller than 1.5 threads; the horizontal clearance between the upper rectangular cutter and the lower rectangular cutter is controlled to increase the shearing force of the cord fabric in unit area, so that the smooth cutting of the steel wire cord is ensured, and the cut is smooth; so as to avoid causing cord fabric cutting burrs and influencing the product quality. Furthermore, when in jointing, the clearance between the feeding and the delivering is adjusted to 1.5-2.5mm, and the sewing pressure of the upper jointer and the lower jointer is adjusted to 0.15-0.25 Mpa; the quality of the joint can be effectively controlled by controlling the gap between the feeding and the delivering during the joint, the problems of thin lines and doubling are avoided, and the dynamic balance and uniformity qualification rate of products are influenced. The control of the sewing pressure ensures that the steel cord joints are smoothly sewed, and the steel cords at the joints are uniformly arranged without quality problems of thin lines, doubling and the like.

The reverse wrapping of the existing forming machine adopts two forms of reverse wrapping, one is reverse wrapping by adopting a reverse wrapping rod 11, and when the reverse wrapping rod 11 reversely wraps, the reverse wrapping is not tight due to gaps between the reverse wrapping rods 11, but the reverse wrapping pressure is large; therefore, the problems of steel wire springback and empty seam are easy to occur, thereby leading to short storage period of the green tire.

This embodiment provides a molding process, as shown in fig. 8, the molding process employs: fitting, ring buckling, presetting, turning up the tire body 5 and tire unloading; wherein, the attaching comprises attaching the PA component 15, attaching the reinforcing layer 44 and attaching the steel wire carcass 5; the PA component 15 is an inner sidewall 3 composite. After the steel wire carcass 5 is attached and the joint is finished, a rolling step is added; in addition, when the rear press roller rolls the steel wire carcass 5, the carcass drum 10 rotates at the rotating speed of 80 +/-10 r/min, the pressure of the rear press roller 9 is kept at 2-2.5bar, and the steel wire carcass is outwards translated and rolled at the set transverse speed of 5-15 mm/sec; the rolling step and the rolling parameter setting can effectively discharge the gas between the tire body 5 and the airtight layer, the bubble rate of the tire blank is reduced by more than 85%, the labor intensity of manual hole punching and tire blank repairing is greatly reduced, and the appearance quality of the tire blank is greatly improved.

When the PA component 15 is attached, the reinforcing layer 44 is attached and the steel wire carcass 5 is attached, the carcass drum 10 rotates for an angle every time one component is attached, so that joints of the components are staggered, the overall strength of the tire is improved, and the gravity distribution of the tire is balanced.

Further, the fastening ring comprises a locking fastening ring of a tire bead locking block; after the tire bead locking block locks the tire bead 4, the high pressure of the tire bead locking block is kept above 5.5 bar;

the pre-shaping comprises inflating the carcass drum 10; wherein the carcass drum 10 is inflated at a pressure of 1.1-1.3 bar;

the tire body 5 is reversely wrapped and comprises a reverse wrapping rod 11; when the turn-up rod 11 turns up, the pressure of the turn-up rod 11 is not lower than 3.5 bar; and after the reverse wrapping is finished, swinging and rotating the press roller to keep the rolling pressure of 2-3bar for rolling.

In order to further avoid the problems of short storage period of the tire blank, resilience of steel wires and empty seam allowance, the buckling ring, presetting and tire body 5 turn-up process are limited as follows. In the embodiment, after the tire bead 4 is locked by the tire bead locking block during ring buckling, the high pressure of the tire bead locking block is kept above 5.5bar, the tire bead 4 can be effectively and accurately positioned and is not easy to shift during molding, and meanwhile, the tire bead 4 and the steel wire carcass are attached more tightly at the seam allowance under the bonding action of the tackifying rubber sheet.

When in presetting, the carcass drum 10 is inflated and expanded at the pressure of 1.1-1.3bar, so that the complete contact between the composite part and the steel wire carcass 5 cord can be effectively ensured, and the connection is tight; thereby improving the bonding strength of the carcass 5. Because the steel wire is strong relative to materials such as polyester and the like, the pre-setting pressure is increased, the sufficient stretching of the tyre body 5 cord before the tyre body 5 cord is contacted with the composite member can be ensured, and the bending of the tyre body cord caused by the insufficient stretching is avoided, so that an unqualified product is formed. In addition, the carcass drum 10 is inflated for 2-5 seconds during the pre-setting to stabilize the inflation effect.

When the tire body 5 is reversely wrapped, the reverse wrapping rod 11 can effectively realize the reverse wrapping of the steel wire tire body cord fabric under the condition that the pressure is not lower than 3.5bar, and the problems of incomplete reverse wrapping, empty seam allowance and the like in the initial reverse wrapping process are solved; meanwhile, the interface component is given certain pre-pressure, so that good rolling conditions are provided for the subsequent rolling. In addition, after the turn-up is finished, the swing rotary pressing roller rolls from the bottom of the seam allowance to the end point of the sidewall 3 under the condition that the rolling pressure is 2-3bar, so that the turn-up quality is improved.

Example 5: as shown in fig. 9, the present invention further provides a manufacturing process of the steel wire carcass ST tire according to any of the above embodiments, including a cutting process and a forming process,

the cutting process comprises cutting, cutting and connecting;

the molding process comprises the following steps: fitting an inner liner 6 and a tire body 5, fastening rings, turning up the tire body 5, turning up and pressing, fitting a piece of bead cloth and a tire side 3, and molding a tire blank;

the jointing of the inner liner 6 and the tire body 5 comprises the jointing of the inner liner 6 and the jointing of the steel wire tire body 5; after the steel wire carcass 5 is jointed and the jointing is finished, the lower pressing roller is lifted to contact the steel wire carcass 5 and keeps the pressure at 1-2bar, the carcass drum 10 rotates at the speed of 600-800mm/s, and the lower pressing roller performs translation rolling from the middle position of the steel wire carcass 5 to the end point of the carcass drum 10 at the speed of 5-30 mm/s.

In the steel cord fabric woven by the steel cord in the embodiment, the wire diameter of the steel cord is less than 0.8 mm; the embodiment provides a cutting process of a steel cord fabric with the wire diameter of the steel cord below 0.8mm, when the steel cord fabric formed by the steel cord with the wire diameter of 0.8mm is cut, a rectangular knife with a knife surface with Rockwell hardness of HRC28-HRC45 is selected for cutting, and the smoothness of a cut is effectively guaranteed; preferably, the rectangular knife is a titanium alloy cutting knife with Rockwell hardness HRC 30. The reason for selecting the titanium alloy cutter is as follows: the titanium alloy has very high strength, the tensile strength is 686-1176MPa, and the density is only about 60 percent of that of the steel; the hardness is higher; the elastic modulus is low and is about half of that of a common steel knife; the titanium alloy cutter has the following outstanding advantages when being applied to cutting the steel cord fabric: the deformation coefficient is small, the deformation coefficient is smaller than or close to 1, the sliding friction of the steel wire on the cutter surface is greatly increased, and the cutting effect is enhanced; the shearing force in unit area is large, and the shearing force in unit contact area is greatly increased due to the extremely short contact length of the steel wire and the cutter face, so that the cutting quality is ensured. In addition, when cutting is performed in the embodiment, the horizontal gap between the upper rectangular cutter and the lower rectangular cutter is smaller than 1.5 threads; the horizontal clearance between the upper rectangular cutter and the lower rectangular cutter is controlled to increase the shearing force of the cord fabric in unit area, so that the smooth cutting of the steel wire cord is ensured, and the cut is smooth; so as to avoid causing cord fabric cutting burrs and influencing the product quality. Furthermore, when in jointing, the clearance between the feeding and the delivering is adjusted to 1.5-2.5mm, and the sewing pressure of the upper jointer and the lower jointer is adjusted to 0.15-0.25 Mpa; the quality of the joint can be effectively controlled by controlling the gap between the feeding and the delivering during the joint, the problems of thin lines and doubling are avoided, and the dynamic balance and uniformity qualification rate of products are influenced. The control of the sewing pressure ensures that the steel cord joints are smoothly sewed, and the steel cords at the joints are uniformly arranged without quality problems of thin lines, doubling and the like.

The reverse wrapping of the existing forming machine adopts two forms of reverse wrapping, one is capsule reverse wrapping, the capsule reverse wrapping is relatively uniform, but the reverse wrapping pressure is small; therefore, the problems of steel wire springback and empty seam are easy to occur, thereby leading to short storage period of the green tire.

This embodiment provides a molding process, as shown in fig. 9, the molding process includes: fitting an inner liner 6 and a tire body 5, fastening rings, turning up the tire body 5, turning up and pressing, fitting a piece of bead cloth and a tire side 3, and molding a tire blank; the jointing of the inner liner 6 and the tire body 5 comprises the jointing of the inner liner 6 and the jointing of the steel wire tire body 5; wherein, after the steel wire carcass 5 is jointed and the joint is finished, a rolling step is added; in addition, when the lower pressing roller rolls the steel wire carcass 5, the carcass drum 10 rotates at the rotating speed of 600-800mm/s, the pressure of the lower pressing roller is kept at 1-2bar, and the translation rolling is carried out from the middle position of the steel wire carcass 5 to the end point of the carcass drum 10 at the speed of 5-30 mm/s; the rolling step and the rolling parameter setting can effectively discharge the gas between the tire body 5 and the airtight layer, the bubble rate of the tire blank is reduced by more than 85%, the labor intensity of manual hole punching and tire blank repairing is greatly reduced, and the appearance quality of the tire blank is greatly improved.

Further, the buckling ring comprises a finger piece 12 grabbing and buckling ring disc 13 buckling ring; the finger-shaped sheet 12 takes 2-4s to grab the steel wire carcass 5; when the ring buckling disc 13 buckles the ring, the pause time is 1-2s when the ring buckling disc 13 moves to the specified position;

the turning-up of the carcass 5 comprises the inflation of the turning-up bladder 14; wherein the inflating of the turn-up capsule 14 is specifically that the inflating of the turn-up capsule 14 is 2-4s, and the pressure is kept at 3.5-4.5 bar; after the reverse-coating capsule 14 is in place and stagnated for 2-4s, the reverse-coating capsule 14 is deflated;

the reverse wrapping and pressing comprises rolling; wherein the rolling is specifically that a lower pressing roller is lifted to contact the steel wire carcass 5 and keeps the pressure at 2-3bar, the carcass drum 10 rotates at the speed of 600-800mm/s, and the lower pressing roller rolls from the end point of the carcass drum 10 to the end point 51 of the steel wire carcass turn-up at the speed of 10-30 mm/s.

In order to further avoid the problems that the storage period of the tire blank is short, the steel wire is easy to rebound and the seam allowance is empty, the buckling ring, the tire body 5 are reversely wrapped and the reversely wrapped pressing process is limited as follows.

The clasp in this embodiment includes a finger tab 12 capture; the finger-shaped sheet 12 takes 2-4s to grab the steel wire carcass 5; when the ring buckling disc 13 buckles the ring, the pause time of the ring buckling disc 13 moving to the specified position is 1-2s, the arrangement of the ring buckling time can effectively ensure that the steel wire ring is accurately positioned, and the steel wire ring is completely contacted and compacted with the tire body steel wire 5;

when the turn-up bladder 14 is inflated in the turn-up process of the tire body 5, the turn-up bladder 14 is inflated for 2-4s, and the pressure is kept at 3.5-4.5 bar; after the reverse-coating capsule 14 is in place and stagnated for 2-4s, the reverse-coating capsule 14 is deflated; the arrangement of the turn-up time and the pressure can ensure the turn-up quality, particularly the compactness of the steel wire ring and the steel wire carcass at the seam allowance, and prolong the storage period of the tyre blank.

The reverse wrapping and pressing comprises rolling; wherein the rolling is specifically that a lower pressing roller is lifted to contact the steel wire carcass 5 and keeps the pressure at 2-3bar, the carcass drum 10 rotates at the speed of 600-800mm/s, and the lower pressing roller rolls from the end point of the carcass drum 10 to the end point 51 of the steel wire carcass turn-up at the speed of 10-30 mm/s. The pressure and the rotating speed during the turn-up rolling can effectively discharge the gas between the tire body 5 and the airtight layer, the bubble rate of the tire blank is reduced by more than 85%, the labor intensity of manual hole punching and tire blank repairing is greatly reduced, and the appearance quality of the tire blank is greatly improved.

In addition, the molding of the tire blank comprises low-pressure inflation, the transfer ring holds the composite part to move right after the low-pressure inflation, the PU drum shrinks to the fixed position width, and the machine head is inflated to high pressure; wherein the low-pressure inflation is carried out, and the low-pressure inflation pressure is 0.3-0.8 bar; the machine head is charged with high pressure 1-1.3 bar.

Case and Performance testing

To illustrate the performance comparison of a steel carcass ST tire bead 4 provided by embodiments of the present invention with a prior art tire bead 4 in a specific case, case 1, comparative example 1 and related performance testing sections are provided below, as follows:

case 1

Selecting the specification of ST235/70R16 for development and research, wherein 3+9 × 0.175NT steel wires are adopted as the cord fabric layer of the steel wire carcass 5, the calendering density is 73EPD, the calendering thickness is 1.8mm, the design width of the cord fabric layer 2 of the steel wire carcass 5 is 660mm, and the falling point position of the turn-up end point 51 of the steel wire carcass is ensured to be lower than the position of the vertical distance of 45 lower end points of the rim protection by 3 mm;

the tackifying film 43 is made of a rubber material with the Shore hardness of 69, the thickness of the film is 0.7mm, the width of the film is 100mm, the outer end point 432 of the tackifying film is flush attached with the reverse wrapping end point 51 of the steel wire carcass, and the vertical distance between the inner end point 431 of the tackifying film and the end point 422 of the triangular rubber is 5mm after reverse wrapping;

the apex 42 is made of a sizing material with the Shore hardness of 90, the design height is 55mm, the falling point of a reverse wrapping end point 51 of the steel wire carcass is lower than the vertical distance of an end point 422 on the apex by 13mm after the reverse wrapping of the 5 cord plies of the steel wire carcass, and meanwhile, the thickness of the apex 42 at the reverse wrapping end point 51 of the steel wire carcass is 3 mm;

this product uses the nylon 66 material as strengthening layer 44, and calendering thickness 1.15mm decides the angle 50, decides the width 60mm, and the individual layer is attached, and the location is 180mm in the attached, and outer location is 240mm, has guaranteed that strengthening layer lower anchor point 441 is less than 51 departments 15mm of steel wire carcass turn-up endpoint, and locating point 442 will be higher than the triangle glue endpoint 422 department 15mm on the strengthening layer.

Comparative example 1

Tire bead structure is taken advantage of to steel wire matrix 5 with the utility model provides a steel wire matrix 5 takes advantage of and uses tire bead structure the same, the difference lies in: the seam allowance structure is not provided with the tackifying film 43.

The utility model discloses an increase a tackified film 43 between 5 casing plies of steel wire body and steel wire 41, reached and improved the shearing between 41 casing plies of steel wire body and the steel wire, promote the adhesion simultaneously, prolong the purpose that the cycle was deposited to the green child embryo. Wherein, the seam allowance emptying problem only occurs after the ST235/70R16 (steel wire carcass) blank storage time in case 1 of the utility model is 16-20h, and the seam allowance emptying phenomenon occurs after the ST235/70R16 (steel wire carcass without increasing the tackifying film) blank storage time is 3-7h without setting the tackifying film 43 in the comparison case.

Testing a machine tool:

machine tests were performed on the bead-structured steel cord casings of example 1 and the comparative example, and the existing ST235/70R16 polyester cord casing, and the test results are shown in table 1:

table 1 matrix machine tool test results

Through the analysis of machine tool test, the steel wire matrix takes advantage of the tire semi-steel child normal relatively, and each item index all promotes to some extent, and the steel wire matrix takes advantage of tire bead structural design reasonable, feasible, and this utility model's product can be applicable to various road conditions, and life-span improvement and security are higher.

To illustrate the structure of the steel wire carcass ST tire provided by the embodiments of the present invention and the performance comparison with the existing tire in a concrete case manner, cases 2-4 and related performance testing sections are provided below, as follows:

case 2

Selecting ST 225/75R 15108M, wherein the ST product has a carcass framework of two layers of 1500D/2 polyester cords, and the two layers of 1500D/2 polyester cords are replaced by one layer of steel wire carcass 0.19+5 × 0.19NT, and the strength indexes are equal, and the specific material information is shown in Table 2.

Table 2 case 2 steel wire carcass material information

Case 3 was compared for weight and not here.

The finished tire weight of the polyester carcass ST 225/75R 15108M was 15.98kg, while the finished tire weight of the steel carcass ST 225/75R 15108M was 16.102kg, the ST tires of the steel carcass were substantially comparable to the ST tires of the ordinary polyester carcass.

Indoor testing

Example 2 tire house test results are shown in table 3:

table 3 case 2 indoor test results for tires

Compared with indoor test results, the steel wire tire body ST tire is superior to a two-layer polyester tire body ST tire in press-through strength, low air pressure durability and high speed, and the result shows that the ST tire made of the steel wire tire body is firmer in structure and better in safety performance.

Outdoor evaluation test

The outdoor evaluation test results are shown in table 4.

Table 4 case 2 tire outdoor evaluation test results

And (4) conclusion: the steel wire tire body replaces an ST tire made of 2 layers of polyester tire bodies, so that the comfort is improved, the controllability is improved, and the ground grabbing force is improved.

Case 3

Selecting ST 235/80R 16123M, wherein the ST product carcass framework is two layers of 2000D/2 polyester cord fabrics, replacing the two layers of 2000D/2 polyester cord fabrics by one layer of steel wire carcass 3+9 × 0.175T, and replacing the two layers of 2000D/2 polyester cord fabrics by equal strength indexes, and the specific material information is shown in Table 5.

Table 5 case 3 steel wire carcass material information

The finished tire weight of the polyester carcass ST 235/80R 16123M was 17.408kg, while the finished tire weight of the wire carcass ST 235/80R 16123M was 17.282kg, which was 0.126kg lower than the ST weight of the ordinary polyester carcass.

Indoor testing

Example 3 tire house test results are shown in table 6:

table 6 case 3 indoor test results for tires

Outdoor evaluation test

The outdoor evaluation test results are shown in table 7.

Table 7 case 3 tire outdoor evaluation test results

Case 4

Selecting ST235/85R 16132/127N, wherein the ST product has a carcass framework of three layers of 1500D/2 polyester cord fabrics, replacing the three layers of 1500D/2 polyester cord fabrics with one layer of steel wire carcass 3 x 0.20+9 x 0.175HT, and replacing the three layers of 1500D/2 polyester cord fabrics with equal strength indexes, wherein the specific material information is shown in Table 8.

Table 8 case 4 steel wire carcass material information

The finished tire weight of the polyester carcass ST235/85R 16132/127N was 20.73kg, while the finished tire weight of the steel carcass ST235/85R 16132/127N was 19.98kg, the steel carcass ST tire weight being 0.75kg lower than the MT tire weight of the ordinary polyester carcass.

Indoor testing

Example 4 results of the in-house testing of tires are shown in table 9.

Table 9 case 4 indoor test results for tires

Compared with indoor test results, the performances of the steel wire carcass ST tire such as press-through strength, low-air-pressure durability and the like are far superior to those of a three-layer polyester carcass ST tire, and the results show that the ST tire made of the steel wire carcass is firmer in structure and better in safety performance; meanwhile, the tire made of the steel wire carcass has more excellent high-speed performance.

Outdoor evaluation test

The outdoor evaluation test results are shown in table 10.

Table 10 case 4 tire outdoor evaluation test results

And (4) conclusion: the steel wire tire body replaces an ST tire made of 3 layers of polyester tire bodies, so that the comfort is improved, the controllability is improved, and the ground grabbing force is improved.

The following describes a process for manufacturing a steel carcass ST tire according to an embodiment of the present invention by way of specific example.

Case 5

The process for forming the steel wire carcass passenger tire comprises the following steps:

in the embodiment, the specification of ST235/70R16 is selected for development and research, the carcass 5 adopts 3+9 × 0.175NT steel wires, the rolling density is 73EPD, and the rolling thickness is 1.8 mm; use the nylon 66 material as reinforcing layer 44, calendering thickness 1.15mm, decide the angle 50 and decide width 60mm, fix a position 180mm in the adhesion, fix a position 240mm outward.

The one-step molding process of the steel wire carcass 5 passenger tire comprises the following steps: fitting, fastening rings, presetting, turning over the tire body 5 and disassembling the tire. Wherein the laminating includes the laminating of PA part 15, reinforcing layer 44 and steel wire matrix 5. The one-step forming process comprises the following specific steps:

① attaching the PA component 15 (figure 1), wherein the main feeding template extends out, the tire body drum 10 rotates to 180 degrees +/-10 degrees, in the embodiment, the conveyer belt rotates 180 degrees synchronously, the front section of the PA component 15 (lining and tire side composite) is attached to the tire body drum 10, the press roller descends to swing and rotate to press the material head, the tire body drum 10 rotates, and the joint part is automatically pressed after the attachment of the PA component 15 is finished;

② attaching the reinforcing layer 44 (fig. 2) by adhering the reinforcing layer 44 to the sub-mouth cloth attaching device in advance, rotating the carcass drum 10 to 135 degrees + -10 degrees, rotating 135 degrees in this embodiment, translating the sub-mouth cloth attaching device to a specified position, extending the attaching device to be close to the carcass drum 10, rotating the carcass drum 10 to attach the reinforcing layer 44 to the carcass drum 10, and automatically pressing the joint;

③ attaching the steel wire carcass 5 (fig. 3), wherein the main feeding template extends out, the carcass drum 10 rotates to 90 degrees +/-5 degrees, in this embodiment, the conveyor belt rotates 90 degrees synchronously, the front section of the steel wire carcass 5 is attached to the carcass drum 10, the multi-layer rollers descend to compress the materials, the carcass drum 10 rotates, the multi-layer rollers lift up after the steel wire carcass 5 is attached, and the carcass 5 is automatically stitched and connected;

in order to solve the problem of air bubbles between the tire body 5 and the air-tight layer, the rolling step of the tire body 5 is added: the rear press roller extends to a designated position to press the tire body 5, the tire body drum 10 rotates at the rotating speed of 80 +/-10 r/min, the pressure of the rear press roller is kept at 2-2.5bar, and the tire body drum is outwards translated and rolled at the set transverse speed of 5-15mm/sec until the rolling at the end point of the tire body 5 is finished; the rolling step can effectively discharge the gas between the tire body 5 and the airtight layer, the bubble rate of the tire blank is reduced by more than 85%, the labor intensity of manual hole punching and tire blank repairing is greatly reduced, and the appearance quality of the tire blank is greatly improved.

The rotating carcass drum 10 in this embodiment rotates at 80r/min, the back-pressure roller pressure is maintained at 2bar, and the translational rolling is performed outward at a set lateral speed of 10mm/sec until the rolling at the end point of the carcass 5 is finished.

④ ring fastening (figure 4), the tyre bead 4 transfer ring moves to the appointed position of the tyre bead drum 10 when the tyre bead drum 10 rotates to the upper tyre bead 4 angle 180 DEG + -10 DEG, the tyre bead locking block rises to lock the tyre bead 4, and the high pressure of the tyre bead 4 locking block is kept above 5.5bar, in the embodiment, the high pressure of the tyre bead locking block is kept at 5.5bar, the tyre bead 4 transfer ring is opened and translated to the other side to prepare the next step, the tyre bead 4 can be positioned accurately when the high pressure of the tyre bead locking block is kept above 5.5bar, the tyre bead 4 is not easy to shift during molding, and the joint of the seam allowance is tighter by the function of viscosity increasing of the tyre bead 4 and the steel.

⑤ presetting (figure 5), rotating the tyre drum 10 to the upper tyre crown 1 angle 0 degree + -10 degree, translating the tyre crown 1 clamping ring to the tyre drum 10 forming position, contracting the tyre drum 10 to the preset forming position and inflating and expanding the tyre drum 10 with the pressure of 1.1-1.3bar, inflating the tyre drum 10 for 2-5s, after the steel tyre 5 is fully expanded, loosening the holding block, the composite member is fully contacted with the steel tyre 5 cord, extending the tyre pressure roller out of the middle part of the press tread, swinging and rolling the tyre crown 1 shoulder and wing part according to the original parameters, inflating and expanding the tyre drum 10 with the pressure of 1.3bar in the embodiment, inflating and expanding the tyre drum 10 with the pressure of 1.1-1.3bar in the tyre drum 10 inflating and expanding, which can effectively ensure the composite member to be fully contacted with the steel tyre 5 cord, and connect tightly, thereby improving the tyre 5 binding strength, the steel wire has strong rigidity relative to the polyester material, the increased pressure can ensure the tyre 5 cord is fully unfolded before being contacted with the composite member, and avoid the tyre 5 cord being insufficiently bent and forming the tyre due to the unqualified bending.

⑥ tire body 5 is turned over (figure 6). The mechanical turn-over rod 11 is under the condition that the pressure is not lower than 3.5bar, the turn-over rod 11 is under the condition that the pressure is 3.5bar in the embodiment, the turn-over rod 11 is supported and presses the components such as the tire side 3, the tire body 5, the reinforcing layer 44 and the like from the seam allowance part to the tail end of the tire side 3 to stop, in order to ensure that the steel wire turn-over end point is tight, the seam allowance is not lost in the storage process of the tire blank, and the rolling procedure of the back pressure roller is adjusted, the swing pressure roller rolls from the bottom of the seam allowance to the end point of the tire side 3 under the condition that the rolling pressure is 2.5bar, the swing pressure roller is 2.5bar, the turn-over end point is tightly combined through the rolling process, so that the problem that the seam allowance is not lost in the storage process of the tire blank is ensured, the turn-over rod 11 can effectively turn over the steel wire tire body at the pressure of not lower than 3.5bar, and ensure that the turn-over is not less than 3.5bar, and the good rolling condition is provided for good.

⑦ tire unloading, wherein the tire crown 1 is held by the clamping block, the tire bead locking block falls, the tire shoulder 2 is exhausted by the bladder, the middle drum stops air, the tire body drum 10 stretches to the position of the interval between the suckers, and the tire blank held by the clamping block is translated to the middle position and released.

The molding process has the following beneficial effects:

by using the forming process, the production efficiency of the steel wire carcass ST tire is high, the production rhythm of each tire at the present stage is 2min-2.5min, and the production time reaches 190 plus 240 tires per shift;

by using the forming process, the laminating effect is good, the comprehensive qualified rate of the steel wire carcass ST tire quality reaches 99.6 percent, the control level in a factory is reached, and the quality index is superior to that of part of common semi-steel tire products.

Case 6

The forming process of the steel wire carcass 5 passenger tire is specifically a secondary forming process:

in the embodiment, the specification of ST235/70R16 is selected for development and research, the carcass 5 adopts 3+9 × 0.175NT steel wires, the rolling density is 73EPD, and the rolling thickness is 1.8 mm; nylon 66 material was used as the reinforcing layer 44, and the sheet was rolled to a thickness of 1.15mm and cut at an angle of 50 degrees to a width of 60 mm.

The two-step molding process of the steel wire carcass 5 passenger tire comprises the following steps: the inner liner 6 and the tire body 5 are attached, the ring is buckled, the tire body 5 is reversely wrapped, the reversely wrapped and pressed, the seam allowance cloth and the tire side 3 are attached, and the tire blank is formed. Wherein the jointing of the inner liner 6 and the tire body 5 comprises the jointing of the inner liner 6 and the jointing of the steel wire tire body 5; the sub-mouth cloth and the tyre side 3 are jointed by the sub-mouth cloth and the tyre side 3. The secondary forming process comprises the following specific steps:

① attaching the inner liner 6, namely, stepping on an automatic step pedal switch, rotating the carcass drum 10 to 0 +/-10 degrees, rotating to 0 degrees in the embodiment, extending the inner liner feeding frame, attaching the inner liner 6 to the carcass drum 10 (attaching according to a positioning line), stepping on the automatic step pedal switch, rotating the carcass drum 10 for 1 week, cutting the inner liner 6 by a cutter with a fixed length, returning the inner liner 6 feeding frame, and rolling the inner liner 6 joint.

② fitting of the steel wire carcass 5, namely stepping on an automatic step pedal switch to rotate the carcass drum 10 to 90 +/-10 degrees and rotate to 90 degrees in the embodiment, simultaneously delivering the steel wire carcass 5 from a feeding frame, attaching the steel wire carcass cord to the inner liner 6 according to a positioning line, stepping on the automatic step pedal switch to rotate the carcass drum 10 for one circle, jointing the steel wire carcass 5 by using an automatic stitching device, stepping on the automatic step pedal switch to enable a lower pressure roller to ascend to contact with the steel wire carcass 5 and keep the pressure at 1-2bar, enabling the carcass drum 10 to rotate at the speed of 600 + 800mm/s, enabling the lower pressure roller to horizontally roll the steel wire carcass 5 from the middle position to the end point of the carcass drum 10 at the speed of 5-30mm/s, effectively discharging gas between the carcass 5 and the air-tight layer through the rolling steps, reducing the bubble rate of the carcass by more than 85%, greatly reducing the labor intensity of manual eyelet repairing the carcass and greatly improving the appearance quality of the carcass.

In this embodiment the lower pressure roller is raised to contact the wire carcass 5 and is kept at a pressure of 1.5bar, the carcass drum 10 is rotated at a speed of 600mm/s and the lower pressure roller is translationally rolled from the middle position of the wire carcass 5 to the end point of the carcass drum 10 at a speed of 10 mm/s.

③ buckling the bead ring 41, namely, stepping on an automatic stepping pedal switch, rotating the tire body drum 10 to a specified angle, extending the finger-shaped sheet 12, moving the buckling ring discs 13 on the headstock and the tailstock, grabbing the bead body 5 by the finger-shaped sheet 12 to bend inwards for 2-4s, continuously moving the buckling ring discs 13 on the headstock and the tailstock until the bead ring 41 is buckled on the bead body 5, and stopping the buckling ring discs 13 for 1-2s, wherein the grabbing time of the finger-shaped sheet 12 is 2.5s, the stopping time of the buckling ring discs 13 is 1.2s, the grabbing time of the finger-shaped sheet 12 is 2-4s, and the stopping time of the buckling ring discs 13 after reaching the specified position is 1-2s, so that the bead ring can be positioned accurately and is completely contacted and compacted with the tire body bead ring 5.

④ turning-up the tyre body 5, inflating the turning-up capsule 14 for 2-4s, keeping the pressure at 3.5-4.5bar, moving the headstock and tailstock to push the buckling ring disc 13 to press the turning-up capsule 14 to move inwards, pressing the steel tyre body 5 by the turning-up capsule 14 to deform inwards, stopping for 2-4s after the turning-up capsule 14 turns up, deflating the turning-up capsule 14, translating the headstock and tailstock outwards, and recovering the capsule to complete the turning-up process, wherein the pressure of the turning-up capsule 14 is kept at 3.5bar in the embodiment, and deflating the turning-up capsule 14 after stopping for 3s after the turning-up capsule 14 turns up, the turning-up capsule 14 inflates for 2-4s, and keeps the pressure at 3.5-4.5bar when inflating, and deflating after stopping for 2-4s after the turning-up capsule 14 turns up, can effectively ensure the turning-up quality and enhance the combination stability of the tyre body 5.

⑤ turn-up stitching, namely, stepping on an automatic step foot switch, enabling a lower pressure roller to rise to contact the steel wire carcass 5 and keep the pressure at 2-3bar, enabling the carcass drum 10 to rotate at the speed of 600-800mm/s, enabling the lower pressure roller to roll from the end point of the carcass drum 10 to the end point 51 of the turn-up of the steel wire carcass at the speed of 10-30mm/s, wherein in the embodiment, the pressure of the lower pressure roller is 2.5bar, the rotating speed of the carcass drum 10 is 20mm/s, the rotating speed of the carcass drum 10 is 800mm/s, the pressure of the lower pressure roller during turn-up stitching is 2-3bar, the carcass drum 10 rotates at the speed of 600-800mm/s, the lower pressure roller rolls at the speed of 10-30mm/s, the stitching effect can be effectively improved, the bonding stability of the carcass 5 is enhanced, the arrangement of the pressure and the rotating speed during turn-up stitching can effectively discharge the gas between the carcass 5 and the airtight layer, the bubble rate of the carcass is reduced by more than 85%, and the labor intensity of manual hole-repairing the carcass.

⑥ fitting seam allowance cloth by stepping on an automatic step pedal switch to rotate the carcass drum 10 to 215 + -10 degrees, rotating to 215 degrees in this embodiment, extending the reinforcing layer feeding frame to fit the reinforcing layer 44 according to the positioning line, and rolling the joint of the reinforcing layer 44;

⑦ tire side 3 attaching, namely stepping on an automatic step pedal switch, rotating the tire body drum 10 to 270 degrees +/-10 degrees, rotating to 270 degrees in the embodiment, extending out the tire side feeding frame, attaching the tire side 3 according to a positioning line, rolling the joint of the tire side 3, stepping on the automatic step pedal switch, simultaneously extending out a lower press roll and a rear press roll, and rolling the tire side 3 and the seam allowance part;

⑧ the tire blank is formed by sheathing a section of tire blank, stepping on an automatic step pedal switch, separating a machine head to a stretching position and positioning width, inflating at low pressure, wherein the low-pressure inflation pressure is 0.3-0.8bar, a transfer ring holds a composite part to move right, a PU drum shrinks to a setting position width, the machine head inflates at high pressure of 1-1.3bar, the transfer ring opens and moves left after the composite part is completely contacted with the section of tire blank, the PU drum rotates, the tire crown 1 imitates a press roll and a rear press roll to respectively roll the center and the shoulder of the tire crown 1, the rear press rolls are reset, and the PU drum shrinks and deflates to unload the tire.

In this embodiment, the low-pressure inflation pressure is 0.4bar, the transfer ring holding composite member moves to the right, the PU drum shrinks to the fixed position width, and the machine head is inflated to the high pressure of 1.2 bar.

By using the forming process, the problems of empty seam allowance, cracking of the side wall 3 and the like existing in the application of the steel wire tire body 5 on the passenger tire are solved, the comprehensive quality qualification rate of the steel wire tire body 5 on the passenger tire reaches 99.6 percent, the in-plant control level is reached, and the quality index is superior to that of part of common semi-steel tire products.

Case 7

In the embodiment, the specification of ST235/70R16 is selected for specific description, the carcass 5 of the tire adopts a steel cord with a 3+9 × 0.175NT structure, the diameter of the steel wire is 0.728mm, the calendering density is 73EPD, the calendering thickness is 1.8mm, and the design width of the steel cord carcass 5 is 660 mm;

the wire diameter of the steel cord is only 0.728mm, and in addition, the NT steel cord has low breaking force and low rigidity, so that the steel cord is comprehensively evaluated to be thin and soft, and the cutting and the joint of the steel cord can not be realized by using the conventional cutting process;

through comparative rigidity analysis, the cutting process of the steel cord fabric formed by the steel cord threads with the diameter of less than 0.8mm can meet the following four conditions:

① cutting knife surface is made of titanium alloy or other alloy with Rockwell hardness HRC28-HRC45, in this embodiment, for cutting 3+9 × 0.175NT steel wire cord, a titanium alloy cutting knife with Rockwell hardness HRC30 is used;

② the cutting process requires the gap between the cutters to be controlled within 1.5 filaments (0.015mm), the steel wire cord cannot be cut smoothly due to too large gap, and the cutter is easy to be damaged due to too small gap, which affects the service life;

③ the cutting process requires that the gap between the head and the tail of the steel wire carcass 5 between the feeding and the delivering materials is controlled within the range of 1.5-2.5mm when the automatic joint is performed, in this embodiment, the gap between the feeding and the delivering material carcass 5 is adjusted to 2.2mm for the 3+9 x 0.175NT steel wire cord cutting at this time, and the gap between the head and the tail of the steel wire carcass 5 between the feeding and the delivering materials is controlled within the range of 1.5-2.5mm when the automatic joint is performed, so that the joint quality can be effectively controlled, and the problems of line thinning and line doubling are avoided, and the dynamic balance and uniformity qualification rate of products are influenced.

④ the cutting process requires adjusting the stitching pressure of the upper and lower splicers to 0.15-0.25MPa when automatic splicing is performed, adjusting the stitching pressure of the upper and lower splicers to 0.15-0.25MPa when the automatic splicing is performed to cut 3+9 × 0.175NT steel wire cords this time, and adjusting the stitching pressure of the upper and lower splicers to 0.15-0.25MPa when automatic splicing is performed, so that the steel wire cord splices smoothly, and the steel wire cords at the splices are arranged uniformly without quality problems such as thin lines and doubling lines.

In the case of satisfying the four conditions required for the above cutting process, the steel cord fabric cutting process for a steel cord fabric having a diameter of 0.8mm or less according to the present embodiment includes unwinding, cutting, and splicing; wherein decide including following step (3), the joint includes following step (4), and is specific:

(1) the rolled wirecord fabric roll is fixed on a cutting machine unwinding device by a crane and is unwound by a traction roller;

(2) cutting off 1-2 steel cord threads at two sides of the steel cord fabric respectively to expose fresh surfaces at the edge ends of the steel cord fabric, and feeding the steel cord fabric to a rectangular knife platform of a cutting device by a cloth feeding and length determining device;

(3) pressing the wirecord fabric by a cloth pressing device, and cutting the wirecord fabric by a rectangular knife; wherein the rectangular cutter surface is a titanium alloy cutter surface with Rockwell hardness HRC 30; the clearance of the rectangular knife is adjusted to 1.5 filaments;

(4) the cut wirecord fabric is adsorbed by a magnet holder to perform 90-degree steering, and is conveyed to a splicing device for splicing, the gap between the feeding and the material transferring tire body 5 is adjusted to 2.2mm, and the sewing pressure of an upper connector and a lower connector is adjusted to 0.2 MPa; when splicing, the two groups of umbrella-shaped wheels move towards two sides along the joint of the two steel wire cord fabrics in a zipper type, splicing is carried out, and then film pasting or edge covering and coiling are carried out.

The cutting process has the following beneficial effects:

by using the cutting process, smooth cutting and joint of the steel cord with the diameter less than 0.8mm can be ensured when the steel cord is cut, the steel cord can be cut smoothly, and the cut is smooth and has no rough edges; the joints are smoothly sewed, and the steel wire cords at the joints are uniformly arranged without quality problems of thin lines, doubling and the like; in addition, the types of the steel cord are not limited to NT, HT, ST, UT and MT, and the steel cord can be cut off smoothly, so that a foundation is laid for the application of the steel cord body 5 on the passenger tire;

the cutting machine can realize the cutting of more varieties of steel wire cords, and the production efficiency is not influenced by different varieties of steel wires.

Claims

1. The steel wire carcass ST tire is characterized in that the longitudinal section of the tire comprises a tire crown (1) positioned on the outer side of the upper part, a tire shoulder (2) connected with the tire crown (1), a tire side (3) connected with the tire shoulder (2), a tire bead (4) connected with the lower part of the tire side (3), and a tire carcass (5) positioned on the inner side of the tire section, wherein the tire carcass (5) comprises a carcass cord fabric, the carcass cord fabric is made of single-layer steel cords, and the steel cords comprise a plurality of steel wires, and the tire carcass cord fabric is characterized in that the strength index of 50000 and 70000N/dm, the breaking force of the steel cords is 400N-850N, the bending rigidity of the steel cords is 70Nmm-130Nmm, the diameter of the steel cords is 0.55mm-0.8mmm, and the diameter of the steel wires is less than 0.3 mm.

2. The steel carcass ST tire according to claim 1, wherein the bead (4) comprises a steel wire ring (41), the steel wire ring (41) is coated with an apex (42) on the circumference, the apex (42) radially extends from an apex lower end point (421) to an apex upper end point (422), the tire carcass (5) winds around the bottom of the steel wire ring (41) to be turned to the sidewall (3) and then radially extends to a carcass turn-up end point (51), a tackifying rubber sheet (43) is arranged between the tire carcass (5) and the apex (42), and the carcass turn-up end point (51) is connected with the apex (42) through the tackifying rubber sheet (43).

3. The wire carcass ST tire according to claim 2, wherein the tackified film (43) comprises a tackified film inner end point (431) located inside the apex (42), and a tackified film outer end point (432) located outside the apex (42), the tackified film inner end point (431) having a radial height higher than that of the apex upper end point (422), the radial distance between the tackified film inner end point (431) and the apex lower end point (421) being not less than 5mm, the radial distance between the tackified film inner end point (431) and the apex upper end point (422) being not less than 10 mm; the radial height of the outer end point (432) of the tackifying film is not lower than that of the carcass turn-up end point (51).

4. The steel wire carcass ST tire according to claim 2, wherein a reinforcing layer (44) is provided between the carcass (5) and the sidewall (3), the lower end of the reinforcing layer (44) is located at a reinforcing layer lower positioning point (441), the upper end of the reinforcing layer (44) is located at a reinforcing layer upper positioning point (442), and the carcass turnup end point (51) is located radially between the reinforcing layer lower positioning point (441) and the reinforcing layer upper positioning point (442); the radial distance between the lower positioning point (441) of the reinforcing layer and the carcass turn-up end point (51) is 10-20 mm; the radial height of the positioning point (442) on the reinforcing layer is higher than that of the end point (422) on the apex, and the radial distance between the positioning point (442) on the reinforcing layer and the end point (422) on the apex is greater than 10 mm; the reinforcing layer (44) forms an angle of 0-55 degrees with the circumference of the tire.

5. Steel wire carcass ST tyre as claimed in claim 4, characterized in that the radial height of the apex (422) is higher than the radial height of the carcass turn-up end (51), the radial distance of the apex (422) from the carcass turn-up end (51) is greater than 10mm, the thickness of the apex (42) at the connection with the carcass turn-up end (51) is not less than 2mm, the thickness of the tackified gum sheet (43) is 0.5-2 mm.

6. Steel carcass ST tire according to claim 5, further comprising a rim protection lower end point (45) located at the sidewall (3) and associated with the rim, the radial distance between the carcass turnup end point (51) and the rim protection lower end point (45) being less than 15 mm.

7. Steel wire carcass ST tyre according to any one of claims 2 to 4, characterized in that the radial height of the upper apex (422) is lower than the radial height of the carcass turn-up end (51), the radial distance of the upper apex (422) from the carcass turn-up end (51) is greater than 10mm and the thickness of the said adhesion promotion glue (43) is comprised between 1.0 and 4.0 mm.

8. Steel wire carcass ST tyre as claimed in claim 7, characterized in that the distance between the inner surfaces of the carcass (5) on both sides of the traveller (41) at the carcass turn-up end point (51) is 2.0-5.0 mm; the distance between the outer surface of the carcass (5) located outside the bead ring (41) and the outer surface of the sidewall (3) at the carcass turn-up end point (51) is 2.5-10 mm.