Aviation radial tire composite shaping drum and tire composite shaping method

Abstract

The invention belongs to the technical field of aviation radial tire manufacturing, and particularly relates to an aviation radial tire composite shaping drum and a tire composite shaping method. The composite shaping drum comprises a left side tire bead downward pushing capsule, a right side tire bead downward pushing capsule, a right side drum, a left side drum and a forming machine main shaft, the left side drum is fixedly arranged at the left side end of the forming machine main shaft, and the right side drum is arranged at the right side end of the forming machine main shaft in a sliding mode; the left side tire bead push-down capsule and the right side tire bead push-down capsule are respectively arranged on the left side drum and the right side drum; the left side drum and the right side drum are respectively used for flexibly wrapping tire beads on two sides of a section of tire blank; in the tire shaping process, the left side tire bead push-down capsule and the right side tire bead push-down capsule conduct flexible extrusion on the outer sides of the tire beads on the two sides of a section of tire blank correspondingly. The wrapping surface of the tire bead floating flexible bag is attached to the tire bead, the bag body is pressurized and has low rigidity, the friction stress area of the tire bead and the bag body is greatly reduced, and the reverse friction force constraint on the end part of the forward wrapping cord fabric and the outer side shape rubber is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation radial tire manufacturing, and particularly relates to an aviation radial tire composite shaping drum and a tire composite shaping method. Background Art

[0002] Aircraft tires are one of the important Class A components on aircraft. They are the only parts that touch the ground during takeoff, landing, and taxiing. They are subjected to high speed and huge static and dynamic loads, and require excellent impact strength. The aircraft tire market is undergoing an accelerated transition from bias tires to radial tires. The development level of aviation radial manufacturing equipment is closely related to the characteristics of tire products. Aviation tire molding is a key process in the tire manufacturing process.

[0003] Aircraft radial tire building machine is the key equipment for manufacturing aircraft radial tires. The tire shaping drum is the key tooling in the tire manufacturing process. Various tire components are assembled and fixed in geometric shape on the tire shaping drum. Aircraft radial tires are mostly formed by a two-stage process according to their product structural characteristics. The tire carcass components are compounded on a first-stage forming machine bonding drum. The section of the compounded tire blank 600 is a small diameter barrel shape. See Figure 1 The crown component is compounded on the second-stage bonding drum, and the cross section of the compounded cap layer 700 is a large-diameter circular ring. After compounding on the first-stage forming machine, the tire blank is inflated on the second-stage shaping drum, and the middle part of the tire body bulges and expands. The tire bead materials on both sides of the tire body turn from outside to inside around the tire steel core. The cross section of the compounded tire body is spindle-shaped. The tire body component and the crown component are finally finalized and assembled.

[0004] See also Figure 1 As shown, the carcass of the aviation radial tire is provided with a positive cord layer 611, and the positive cord layer 611 has an end at the position of the carcass steel core 614, and the positive cord layer 611 is attached with a bead-shaped rubber 612 at the position of the bead 610. When the cross-section of the tire blank changes from a cylindrical barrel shape to a spindle shape, the positive cord layer 611 and the bead-shaped rubber 612 rotate from the outside to the inside around the carcass steel core 614. In this process, the positive cord layer 611 and the bead-shaped rubber 612 attached to the outside, driven by the adhesion of the reverse cord layer 616, overcome the friction of the shaping drum steel ring tightening device and turn over from the outside to the inside around the carcass steel core 614. When there is stress concentration or large friction in the steel ring tensioning device, the front cord layer 611 is displaced and the bead-shaped rubber 612 is deformed by accumulation. The stress and strain changes between the components that are not expected in the manufacturing process cause the semi-finished tire parts to be shaped and the positioning dimensions to change, which ultimately causes the finished tire properties to change. Therefore, it is necessary to develop a new tire shaping drum and method to solve the problem of displacement of the front cord and accumulation deformation of the bead-shaped rubber position of aviation radial tires. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide an aviation radial tire composite shaping drum and a tire composite shaping method to solve the problems of displacement of the front cord of the aviation radial tire and accumulation and deformation of the bead rubber position.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] On the one hand, the present invention provides a composite shaping drum for aviation radial tires, comprising a left bead push-down capsule, a right bead push-down capsule, a right drum, a left drum and a main shaft of a forming machine, wherein the left drum is fixedly arranged at the left end of the main shaft of the forming machine, and the right drum is slidably arranged at the right end of the main shaft of the forming machine; the left bead push-down capsule and the right bead push-down capsule are respectively arranged on the left drum and the right drum, and the left drum and the right drum are respectively used to flexibly wrap the beads on both sides of a section of tire blank; during the tire shaping process, the left bead push-down capsule and the right bead push-down capsule are respectively flexibly squeezed on the outer sides of the beads on both sides of a section of tire blank.

[0008] The left drum and the right drum have the same structure, both including a concave flexible wrapping structure, a piston and a cylinder body, wherein the cylinder body has an annular cavity, the piston is an annular structure and has a conical end face, the piston is accommodated in the annular cavity of the cylinder body and slides with the cylinder body; the concave flexible wrapping structure is arranged on the cylinder body and contacts with the conical end face of the piston; when the piston moves axially, it can push the concave flexible wrapping structure to move radially, and the concave flexible wrapping structure is used for flexibly wrapping the tire ring.

[0009] The concave flexible wrapping structure includes a sealing ring, a tire bead floating flexible bag and a plurality of sliders, wherein the plurality of sliders are respectively arranged in a plurality of radial guide grooves arranged circumferentially on the cylinder body, and the sliders can slide radially; the inner side surface of each slider is an inclined surface that fits the conical end surface of the piston, and the outer surface of each slider has a groove; the sealing ring is sleeved in the groove of each slider, and the two side edges of the sealing ring are fixed on the cylinder body, and the tire bead floating flexible bag is sleeved on the outside of the sealing ring; when the piston is without pressure, the pulling force of the sealing ring causes each slider to retract in the inner diameter direction.

[0010] The surfaces of the slider, tire bead floating flexible bag and sealing ring all have the same specific shape curve, and the side of the groove on the outer surface of the slider is a straight surface or an inclined surface; based on the symmetry center line of the left drum and the right drum, the bottom surface of the groove on the outer surface of the slider is a straight surface or a curved surface that gradually increases from the inside to the outside, and the cross-sectional width of the groove is 2-3.5 times the tire bead width.

[0011] The tire bead floating flexible bag has an independent closed cavity, and the tire bead is flexibly wrapped by inflating the independent closed cavity.

[0012] The left tire bead push-down capsule and the right tire bead push-down capsule have the same structure, both comprising a support seat and an eccentric capsule arranged on the support seat, wherein the support seat is installed on the left drum or the right drum, and the installation position can be adjusted along the axial direction.

[0013] The eccentric capsule is pressed onto the support seat to form a closed cavity. When not pressurized, the eccentric capsule is in an eccentric shape, and the circumference of the upper part of the capsule is longer than the circumference of the lower part of the capsule.

[0014] The right drum is sleeved on the main shaft of the molding machine through a main shaft sleeve of the molding machine, and the main shaft sleeve of the molding machine can move axially on the main shaft of the molding machine.

[0015] The cylinder body includes a coaxially mounted cylinder outer sleeve and a cylinder inner sleeve, and the annular cavity is formed between the cylinder outer sleeve and the cylinder inner sleeve; the cylinder inner sleeve of the left drum is fixedly connected to the main shaft of the molding machine; the cylinder inner sleeve of the right drum is fixedly connected to the main shaft sleeve of the molding machine.

[0016] Another aspect of the present invention provides a tire composite shaping method using the above-mentioned aviation radial tire composite shaping drum, comprising the following steps:

[0017] Step S1: installing a tire blank;

[0018] Step S2: 4.0-4.3 bar wind pressure is filled into the cylinders of the left drum and the right drum, and the slider moves radially to tighten the tire beads on both sides of a section of the tire blank;

[0019] Step S3: The tire bead floating flexible bag is filled with a wind pressure of 1.3-1.5 bar, and the tire bead floating flexible bag completely wraps the tire bead;

[0020] Step S4: increasing the wind pressure of the tire bead floating flexible bag to 5.3-6.0 bar, reducing the wind pressure in the cylinder to 3.2-3.5 bar, the tire bead floating flexible bag floats, and the slider maintains a low tension of 2.2-2.5 bar;

[0021] Step S5: 1.3-1.5 bar wind pressure is filled into the tire cavity inside a section of the tire blank, so that the middle part of the tire body of the section of the tire blank swells and expands, and the left drum and the right drum move inward with the expansion of the tire body, and keep the inner side of the tire bead in contact with the inner side surfaces of the sliders on both sides;

[0022] Step S6: When the two sides of a tire blank are 40-50 degrees apart, the eccentric capsule is inflated to 1.2-1.5 bar, the surface of the eccentric capsule abuts against the surface of a tire blank and rotates toward the symmetry line of the eccentric capsule installation; the left drum and the right drum keep moving inward, and the eccentric capsule maintains pressure and pushes the tire bead inward and downward;

[0023] Step S7: When the distance between the left drum and the right drum reaches 1.0-1.2 times the width of the cap layer, a section of the tire blank is shaped like a spindle, the diameter of the carcass bulge is close to the diameter of the cap layer, and the left drum and the right drum stop moving;

[0024] Step S8: After the tire body, cap layer and shape rubber are compounded and rolled, the eccentric bladder is depressurized, the tire cavity of a section of the tire blank is depressurized, the tire bead floating flexible bag is depressurized, the cylinder body is depressurized, the slider is radially contracted, and the compounded tire blank is removed.

[0025] The present invention has the following beneficial effects and advantages: the composite shaping drum for aviation radial tires provided by the present invention adds a tire bead floating flexible bag and a tire bead push-down bag to the shaping drum design, and cooperates with the shaping method to improve the overall tire manufacturing quality and avoid manual repair methods after tire molding to make up for some manufacturing technology defects.

[0026] The tire bead floating flexible bladder wrapping surface of the present invention is attached to the tire bead, and the bladder body is pressurized with low rigidity, which greatly reduces the friction force area between the tire bead and the bladder body, and reduces the reverse friction force constraint on the end of the positive cord and the outer side rubber.

[0027] The inward force and downward force generated by the eccentric capsule of the present invention are greater than the outward force of the tire bead, thereby preventing the tire bead from contacting the outer edge of the slider and promoting the tire bead to rotate.

[0028] The present invention combines the eccentric capsule and the slider in a concave curve to meet the requirements of the shaping process of a section of tire embryo cross section in a cylindrical barrel shape, an arc column shape, and a spindle shape. At the same time, during the rotation process of a section of the tire embryo ring, the strong friction outward force generated by the tire ring is significantly reduced, stress concentration is avoided in local areas, and the rotation of the tire ring material is promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of a tire embryo and a cap layer;

[0030] Figure 2 It is a structural schematic diagram of the composite shaping drum of the aviation radial tire of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the left drum and the left tire bead push-down bladder in the present invention;

[0032] Figure 4 It is a structural schematic diagram of the slider in the present invention;

[0033] Figure 5 The figure is a schematic diagram of the working state of the composite shaping drum for aviation radial tires of the present invention.

[0034] In the figure: 100 is the left tire bead push-down capsule, 110 is the left eccentric capsule, 111 is the lower part of the left eccentric capsule, 112 is the upper part of the left eccentric capsule, and 120 is the left support seat;

[0035] 200 is a right tire bead push-down capsule, 210 is a right eccentric capsule, 211 is a lower part of the right eccentric capsule, 212 is an upper part of the right eccentric capsule, and 220 is a right support seat;

[0036] 300 is the right drum, 310 is the right slider, 311 is the inside of the right slider, 312 is the outer surface of the right slider, 313 is the outside of the right slider, 320 is the right sealing ring, 330 is the right tire bead floating flexible bag, 340 is the right cylinder jacket, 350 is the right piston, and 360 is the right cylinder jacket;

[0037] 400 is the left drum, 410 is the left slider, 411 is the outer side of the left slider, 412 is the outer surface of the left slider, 413 is the inner side of the left slider, 420 is the left sealing ring, 430 is the left tire bead floating flexible bag, 440 is the left cylinder jacket, 450 is the left piston, and 460 is the left cylinder jacket;

[0038] 500 is the main shaft of the molding machine, 510 is the main shaft core of the molding machine, and 520 is the main shaft sleeve of the molding machine;

[0039] 600 is a tire blank, 610 is a tire bead, 611 is a positive cord layer, 612 is a tire bead-shaped rubber, 613 is an outer side of the tire bead, 614 is a tire body steel core, 615 is an inner side of the tire bead, and 616 is a reverse cord layer;

[0040] 700 is the cap layer; 800 is the fetal cavity. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] See also Figure 1 , Figure 5 As shown, the present invention provides a composite shaping drum for aviation radial tires, comprising a left bead push-down capsule 100, a right bead push-down capsule 200, a right drum 300, a left drum 400 and a molding machine main shaft 500, wherein the left drum 400 is fixedly arranged at the left end of the molding machine main shaft 500, and the right drum 300 is slidably arranged at the right end of the molding machine main shaft 500; the left bead push-down capsule 100 and the right bead push-down capsule 200 are respectively arranged on the left drum 400 and the right drum 300, and the left drum 400 and the right drum 300 are respectively used to flexibly wrap the tire beads 610 on both sides of a tire blank 600; during the tire shaping process, the left bead push-down capsule 100 and the right bead push-down capsule 200 are respectively flexibly squeezed on the outer sides of the tire beads 610 on both sides of a tire blank 600.

[0043] Specifically, the right drum 300 is mounted on the molding machine main shaft 500 through the molding machine main shaft sleeve 520, and the molding machine main shaft sleeve 520 can move axially on the molding machine main shaft 500. When the molding machine main shaft 500 and the molding machine main shaft sleeve 520 move symmetrically, the left drum 400 and the right drum 300 with symmetrical structures are driven to follow the movement.

[0044] In an embodiment of the present invention, the left drum 400 and the right drum 300 have the same structure, both comprising a concave flexible wrapping structure, a piston and a cylinder body, wherein the cylinder body has an annular cavity, the piston is an annular structure and has a conical end face, the piston is accommodated in the annular cavity of the cylinder body and slides with the cylinder body; the concave flexible wrapping structure is arranged on the cylinder body and contacts with the conical end face of the piston; when the piston moves axially, it can push the concave flexible wrapping structure to move radially, and the concave flexible wrapping structure is used for flexibly wrapping the tire ring 610.

[0045] Specifically, see Figure 2 , Figure 3 As shown, the cylinder body of the left drum 400 includes a left cylinder body outer sleeve 440, a left piston 450 and a left cylinder body inner sleeve 460, wherein the left cylinder body inner sleeve 460 is fixedly connected to the end face of the main shaft core shaft 510 of the molding machine, the left cylinder body outer sleeve 440 is coaxially sleeved on the outside of the left cylinder body inner sleeve 460, and a left annular cavity is formed between the left cylinder body outer sleeve 440 and the left cylinder body inner sleeve 460, and the left piston 450 is slidably fitted in the left annular cavity.

[0046] Specifically, see Figure 2 As shown, the cylinder body of the right drum 300 includes a right cylinder outer sleeve 340, a right piston 350 and a right cylinder inner sleeve 360, wherein the right cylinder inner sleeve 360 ​​is fixedly arranged on the outer side of the end surface of the main shaft sleeve 520 of the molding machine, the right cylinder outer sleeve 340 is coaxially sleeved on the outer side of the right cylinder inner sleeve 360, and a right annular cavity is formed between the right cylinder outer sleeve 340 and the right cylinder inner sleeve 360, and the right piston 350 is slidably fitted in the right annular cavity.

[0047] In an embodiment of the present invention, the concave flexible wrapping structure includes a sealing ring, a tire bead floating flexible bag and a plurality of sliders, wherein the plurality of sliders are arranged in a plurality of radial guide grooves arranged circumferentially on the cylinder body, and the sliders can slide radially in the radial guide grooves; the inner side surface of each slider fits with the conical end surface of the piston, and the outer surface of each slider has a groove, the sealing ring is sleeved in the groove of each slider, and the two side edges of the sealing ring are fixed on the cylinder body; the tire bead floating flexible bag is sleeved on the outside of the sealing ring. When the piston is without pressure, the pulling force of the sealing ring causes each slider to retract in the inner diameter direction; the piston drives each slider to move in the outer diameter direction under wind pressure to produce a tensioning action. Specifically, the number of sliders is 15-50.

[0048] Furthermore, the bottom of the groove on the outer surface of the slider is a curved surface that gradually increases in height from the inside to the outside.

[0049] Specifically, the slider, the tire bead floating flexible bag and the sealing ring surface all have the same specific shape curve, more preferably an inverted trapezoidal curve, the inverted trapezoidal vertical surface can be vertical or oblique, based on the symmetry center line of the left drum 400 and the right drum 300, and the two inverted trapezoidal top surface curves are straight or curved surfaces with the outer side higher and the inner side lower.

[0050] Furthermore, the tire bead floating flexible bag has an independent closed cavity, has a nozzle connected to the machine pipeline, and can be inflated, pressure-maintained, and deflated, and the tire bead 610 is flexibly wrapped by inflating the independent closed cavity.

[0051] Specifically, the concave flexible wrapping structure of the left drum 400 includes a left sealing ring 420, a left tire bead floating flexible bag 430 and a plurality of left sliders 410, wherein the plurality of left sliders 410 are respectively accommodated in a plurality of radial guide ring grooves provided on the left cylinder housing 440, and the bottom of each left slider 410 is fitted with the conical end surface of the left piston 450 through an inclined surface; the left sealing ring 420 is sleeved in a groove provided on the outer surface 412 of the left slider, and the two ends of the left sealing ring 420 are fixed on the left cylinder housing 440. The left tire bead floating flexible bag 430 is arranged on the outside of the left sealing ring 420 and has an independent cavity.

[0052] See also Figure 4 As shown, the groove on the outer surface 412 of the left slider is an inverted trapezoidal structure, and the bottom surface gradually increases from the inside to the outside, so that the length of the outer side 411 of the left slider is smaller than the length of the inner side 413 of the left slider. The width of the inverted trapezoidal section of the slider is 2-3.5 times the diameter of the tire steel core.

[0053] Specifically, the right drum 300 includes a right sealing ring 320, a right tire bead floating flexible bag 330 and a plurality of right sliders 310, wherein the plurality of right sliders 310 are accommodated in the radial guide ring grooves on the right cylinder housing 340, a groove is provided on the outer surface 312 of the right slider, the right sealing ring 320 is sleeved in the groove, and both sides of the right sealing ring 320 are fixed on the right cylinder housing 340. The right tire bead floating flexible bag 330 is arranged on the outer side of the right sealing ring 320 and has an independent cavity.

[0054] In an embodiment of the present invention, the left tire bead push-down capsule 100 and the right tire bead push-down capsule 200 have the same structure, both comprising a support seat and an eccentric capsule arranged on the support seat, wherein the support seat is installed on the left drum 400 or the right drum 300, and the installation position can be adjusted along the axial direction.

[0055] Furthermore, the eccentric capsule is press-fitted on the support seat to form a closed cavity, and has a nozzle connected to the machine pipeline, which can be inflated, pressure-maintained, and deflated. When the eccentric capsule is not pressurized, it is eccentric in shape, and the circumference of the upper part of the capsule is longer than the circumference of the lower part of the capsule.

[0056] Specifically, see Figure 2 , Figure 3 As shown, the left tire bead push-down capsule 100 includes a left eccentric capsule 110 and a left support seat 120, wherein the left support seat 120 is installed on the outside of the left cylinder housing 440 and can slide relative to the left cylinder housing 440, and lock the relative position after adjusting the position. The left eccentric capsule 110 is eccentric relative to the installation axis, and the length of the upper part 112 of the left eccentric capsule is greater than the length of the lower part 111 of the left eccentric capsule.

[0057] Specifically, see Figure 2 As shown, the right tire bead push-down capsule 200 includes a right eccentric capsule 210 and a right support seat 220, wherein the right support seat 220 is installed on the outside of the right cylinder housing 340 and can move axially relative to the right cylinder housing 340, and the relative position is locked after the installation position is adjusted. The right eccentric capsule 210 is eccentric relative to the installation axis, and the length of the upper part 212 of the right eccentric capsule is greater than the length of the lower part 211 of the right eccentric capsule.

[0058] The invention provides a composite shaping drum for aviation radial tires, which is used in the shaping manufacturing process of the tire molding process. The drum is inflated in a sealed cavity formed by a tire embryo, a left drum, a right drum, and a main shaft, the middle part of the tire body bulges and expands, a tire embryo bead material rotates around the tire body steel core from outside to inside, and the cap layer and the tire body are assembled. The invention accurately controls the deformation process of the tire embryo section from a cylindrical barrel shape to a spindle shape in the shaping process of the aviation radial tire with a positive cord structure, solves the problem of displacement and deformation between components that are not designed and expected in the manufacturing process, such as the accumulation of bead materials during the tire molding process, and improves the composite assembly accuracy of various tire components during the shaping process as a whole.

[0059] See also Figures 2 to 5 As shown, another embodiment of the present invention provides a tire composite shaping method using the aviation radial tire composite shaping drum in the above embodiment, comprising the following steps:

[0060] Step S1: installing a tire blank 600;

[0061] The left drum 400 is connected to the end face of the main shaft core shaft 510 of the forming machine, the right drum 300 is connected to the end face of the main shaft sleeve 520 of the forming machine, and the right tire bead push-down capsule 200 is connected to the surface of the right cylinder jacket 340, and the positioning relationship is that the eccentric capsule is 40-120mm away from the inner side of the slider in the axial direction; the main shaft core shaft 510 of the forming machine and the main shaft sleeve 520 of the forming machine move relative axially to drive the left drum 400 and the right drum 300 to separate and combine, and the positioning relationship is that the inner side spacing of the sliders of the left drum 400 and the right drum 300 is consistent with the inner side spacing of a cylindrical tire embryo ring; a cylindrical tire embryo is inserted into the left drum 400 and the right drum 300, and the positioning relationship is that a cylindrical tire embryo maintains a symmetrical center with the left drum 400 and the right drum 300, and further, the inner side 615 of the tire bead of a cylindrical tire embryo abuts against the inner side surfaces of the sliders on both sides;

[0062] Step S2: The cylinders of the left drum 400 and the right drum 300 are filled with a wind pressure of 4.0-4.3 bar, and the sliders move radially to tighten the tire beads 610 on both sides of a section of the tire blank 600;

[0063] Step S3: The tire bead floating flexible bag is filled with a wind pressure of 1.3-1.5 bar, and the tire bead floating flexible bag completely wraps the tire bead 610;

[0064] Step S4: Increase the wind pressure of the tire bead floating flexible bag to 5.3-6.0 bar, reduce the wind pressure in the cylinder to 3.2-3.5 bar, the tire bead floating flexible bag floats, and the slider maintains a low tension of 2.2-2.5 bar; multiple tests are performed to obtain the wind pressure values ​​of the cylinder and tire bead floating flexible bag after optimization;

[0065] Step S5: 1.3-1.5 bar wind pressure is filled into the tire cavity 800 inside the tire blank 600, and the middle part of the tire body of the tire blank 600 swells and expands, and the left drum 400 and the right drum 300 move inward with the expansion of the tire body, and keep the inner side 615 of the tire bead in contact with the inner side surfaces of the sliders on both sides;

[0066] Step S6: When the two sides of a tire blank 600 are 40-50 degrees, the eccentric capsule is inflated to 1.2-1.5 bar, and the surface of the eccentric capsule abuts against the surface of a tire blank and rotates toward the symmetry line of the eccentric capsule installation; the left drum 400 and the right drum 300 keep moving inward, and the eccentric capsule maintains pressure and pushes the tire bead 610 inward and downward;

[0067] Specifically, during the process of the tire blank section changing from arc shape to spindle shape, the tire bead 610 generates an outward force, and the inward force and downward force generated by the eccentric capsule are greater than the outward force of the tire bead, thereby preventing the tire bead 610 from contacting the outer side of the slider and promoting the tire bead to rotate;

[0068] Step S7: When the distance between the left drum 400 and the right drum 300 reaches 1.0-1.2 times the width of the cap layer 700, a section of the tire blank is shaped like a spindle, and the diameter of the carcass bulge is close to the diameter of the cap layer, and the left drum 400 and the right drum 300 stop moving;

[0069] Step S8: After the tire body, cap layer and shape rubber are compounded and rolled, the eccentric bladder is depressurized, the tire cavity 800 of a section of the tire blank 600 is depressurized, the tire bead floating flexible bag is depressurized, the cylinder body is depressurized, the slider is radially contracted, and the compounded tire blank is removed.

[0070] The present invention provides a tire composite shaping method, which adds a tire bead floating flexible bladder and a tire bead push-down bladder to the shaping drum design, and cooperates with the shaping method to improve the overall tire manufacturing quality and avoid artificial repair methods after tire molding to make up for some manufacturing technology defects. The tire bead is attached to the bead through the bead floating flexible bladder wrapping surface, and the bladder body is pressurized with low rigidity, which greatly reduces the friction force area between the tire bead and the bladder body, and reduces the reverse friction force constraint on the end of the positive cord and the outer side of the rubber. The inward force and downward force generated by the eccentric bladder are greater than the outward force of the tire bead, which avoids the tire bead from contacting the outer edge of the slider and promotes the rotation of the tire bead.

[0071] The present invention combines the eccentric capsule and the slider in a concave curve to meet the requirements of the shaping process of a section of tire embryo cross section in a cylindrical barrel shape, an arc column shape, and a spindle shape. At the same time, during the rotation process of a section of the tire embryo ring, the strong friction outward force generated by the tire ring is significantly reduced, stress concentration is avoided in local areas, and the rotation of the tire ring material is promoted.

[0072] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A composite shaping drum for aviation radial tires, characterized in that: The invention comprises a left tire bead push-down capsule (100), a right tire bead push-down capsule (200), a right drum (300), a left drum (400) and a main shaft (500) of a forming machine, wherein the left drum (400) is fixedly arranged at the left end of the main shaft (500) of the forming machine, and the right drum (300) is slidably arranged at the right end of the main shaft (500) of the forming machine; the left tire bead push-down capsule (100) and the right tire bead push-down capsule (200) are respectively arranged on the left drum (400) and the right drum (300), and the left drum (400) and the right drum (300) are respectively used to flexibly wrap the tire beads (610) on both sides of a tire blank (600); during the tire shaping process, the left tire bead push-down capsule (100) and the right tire bead push-down capsule (200) are respectively flexibly squeezed on the outer sides of the tire beads (610) on both sides of a tire blank (600).

2. The composite shaping drum for aviation radial tire according to claim 1, characterized in that: The left drum (400) and the right drum (300) have the same structure, both comprising a concave flexible wrapping structure, a piston and a cylinder body, wherein the cylinder body has an annular cavity, the piston is an annular structure and has a conical end face, the piston is accommodated in the annular cavity of the cylinder body and slidably cooperates with the cylinder body; the concave flexible wrapping structure is arranged on the cylinder body and contacts the conical end face of the piston; when the piston moves axially, it can push the concave flexible wrapping structure to move radially, and the concave flexible wrapping structure is used for flexibly wrapping the tire bead (610).

3. The composite shaping drum for aviation radial tire according to claim 2, characterized in that: The concave flexible wrapping structure includes a sealing ring, a tire bead floating flexible bag and a plurality of sliders, wherein the plurality of sliders are respectively arranged in a plurality of radial guide grooves arranged circumferentially on the cylinder body, and the sliders can slide radially; the inner side surface of each slider is an inclined surface that fits the conical end surface of the piston, and the outer surface of each slider has a groove; the sealing ring is sleeved in the groove of each slider, and the two side edges of the sealing ring are fixed on the cylinder body, and the tire bead floating flexible bag is sleeved on the outside of the sealing ring; when the piston is without pressure, the pulling force of the sealing ring causes each slider to retract in the inner diameter direction.

4. The composite shaping drum for aviation radial tires according to claim 3, characterized in that: The surfaces of the slider, tire bead floating flexible bag and sealing ring all have the same specific curve shape, and the side surface of the groove on the outer surface of the slider is a straight surface or an inclined surface; based on the symmetry center line of the left drum (400) and the right drum (300), the bottom surface of the groove on the outer surface of the slider is a straight surface or a curved surface that gradually increases from the inside to the outside, and the cross-sectional width of the groove is 2-3.5 times the tire bead width.

5. The composite shaping drum for aviation radial tires according to claim 3, characterized in that: The tire bead floating flexible bag has an independent closed cavity, and the tire bead (610) is flexibly wrapped by inflating the independent closed cavity.

6. The composite shaping drum for aviation radial tires according to claim 3, characterized in that: The left tire bead push-down capsule (100) and the right tire bead push-down capsule (200) have the same structure, both comprising a support seat and an eccentric capsule arranged on the support seat, wherein the support seat is installed on the left drum (400) or the right drum (300), and the installation position can be adjusted along the axial direction.

7. The composite shaping drum for aviation radial tires according to claim 6, characterized in that: The eccentric capsule is pressed onto the support seat to form a closed cavity. When not pressurized, the eccentric capsule is in an eccentric shape, and the circumference of the upper part of the capsule is longer than the circumference of the lower part of the capsule.

8. The composite shaping drum for aviation radial tires according to claim 2, characterized in that: The right drum (300) is sleeved on the molding machine main shaft (500) via a molding machine main shaft sleeve (520), and the molding machine main shaft sleeve (520) can move axially on the molding machine main shaft (500).

9. The composite shaping drum for aviation radial tires according to claim 8, characterized in that: The cylinder body comprises a coaxially mounted cylinder body outer sleeve and a cylinder body inner sleeve, and the annular cavity is formed between the cylinder body outer sleeve and the cylinder body inner sleeve; the cylinder body inner sleeve of the left drum (400) is fixedly connected to the main shaft core shaft (510) of the molding machine; and the cylinder body inner sleeve of the right drum (300) is fixedly connected to the main shaft sleeve (520) of the molding machine.

10. A tire composite shaping method using the composite shaping drum for aviation radial tires according to claim 7, characterized in that: The following steps are involved: Step S1: installing a tire blank (600); Step S2: 4.0-4.3 bar wind pressure is filled into the cylinders of the left drum (400) and the right drum (300), and the slider moves radially to tighten the tire beads (610) on both sides of a tire blank (600); Step S3: The tire bead floating flexible bag is filled with a wind pressure of 1.3-1.5 bar, and the tire bead floating flexible bag completely wraps the tire bead (610); Step S4: increasing the wind pressure of the tire bead floating flexible bag to 5.3-6.0 bar, reducing the wind pressure in the cylinder to 3.2-3.5 bar, the tire bead floating flexible bag floats, and the slider maintains a low tension of 2.2-2.5 bar; Step S5: A wind pressure of 1.3-1.5 bar is filled into the tire cavity (800) inside a section of the tire blank (600), so that the middle part of the tire body of the section of the tire blank (600) swells and expands, and the left drum (400) and the right drum (300) move inwards as the tire body expands, and the inner side of the tire bead (610) is kept in contact with the inner side surfaces of the sliders on both sides; Step S6: When the two sides of a tire blank (600) are 40-50 degrees, the eccentric capsule is inflated to 1.2-1.5 bar, and the surface of the eccentric capsule abuts against the surface of a tire blank and rotates toward the symmetry line of the eccentric capsule installation; the left drum (400) and the right drum (300) keep moving inward, and the eccentric capsule maintains pressure and pushes the tire bead (610) inward and downward; Step S7: When the distance between the left drum (400) and the right drum (300) reaches 1.0-1.2 times the width of the cap layer (700), a section of the tire blank is shaped like a spindle, and the diameter of the carcass bulge is close to the diameter of the cap layer, and the left drum (400) and the right drum (300) stop moving; Step S8: After the tire body, cap layer and shape rubber are compounded and rolled, the eccentric bladder is depressurized, the tire cavity (800) of a tire blank (600) is depressurized, the tire bead floating flexible bag is depressurized, the cylinder is depressurized, the slider is radially contracted, and the compounded tire blank is removed.

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