Composite building drum for aircraft radial tire and method of composite building of a tire

Abstract

The present application belongs to the technical field of aircraft radial tire manufacturing, and particularly relates to a kind of aircraft radial tire composite shaping drum and tire composite shaping method.The composite shaping drum includes left side bead push capsule, right side bead push capsule, right side drum, left side drum and forming machine main shaft, wherein the left side drum is fixedly arranged on the left side end of the forming machine main shaft, and the right side drum is slidingly arranged on the right side end of the forming machine main shaft;the left side bead push capsule and the right side bead push capsule are respectively arranged on the left side drum and the right side drum, and the left side drum and the right side drum are respectively used for flexibly wrapping the two side beads of a section of tire blank;in the tire shaping process, the left side bead push capsule and the right side bead push capsule respectively flexibly extrude outside the two side beads of a section of tire blank.The present application is attached to the bead by the flexible capsule of the floating bead, the capsule body has low rigidity, the frictional stress area of the bead and the capsule is greatly reduced, and the positive wrapping fabric end and the outside shape rubber are constrained by the reverse friction force.

Description

Technical Field

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

[0002] Aircraft tires are one of the most important Class A components on aircraft. They are the only part that touches the ground during takeoff, landing, and taxiing. They withstand high speeds and enormous static and dynamic loads, requiring excellent impact strength. The aircraft tire market is undergoing an accelerated shift from bias-ply tires to radial tires. The development level of aircraft radial tire manufacturing equipment is closely related to tire product characteristics. Aircraft tire molding is a key process in the tire manufacturing process.

[0003] The aircraft radial tire building machine is a key piece of equipment in the manufacturing of aircraft radial tires. The tire shaping drum is a key piece of equipment in the tire manufacturing process. Various tire components are assembled and fixed in geometry on the tire building drum. Due to their structural characteristics, aircraft radial tires often use a two-stage building process. The tire carcass components are laminated on the laminating drum of the first-stage building machine. The cross-section of the laminated tire blank 600 is a small-diameter cylindrical shape. Figure 1 As shown in the figure, the crown components are laminated on the second-stage laminating drum. The laminated cap layer 700 has a large-diameter circular cross-section. After lamination on the first-stage forming machine, the tire blank is inflated on the second-stage shaping drum. The center of the tire body swells and expands, and the bead materials on both sides of the tire body rotate from the outside to the inside around the tire steel core. The laminated tire body has a spindle-shaped cross-section. Finally, the tire body components and crown components are finalized and assembled.

[0004] See also Figure 1 As shown, the aircraft radial tire carcass is provided with a front-wrapped ply 611, which has an end at the position of the carcass steel core 614. Bead-shaped rubber 612 is attached to the front-wrapped ply 611 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 front-wrapped ply 611 and the bead-shaped rubber 612 rotate from the outside to the inside around the carcass steel core 614. During this process, the front-wrapped ply 611 and the bead-shaped rubber 612 attached to the outside, driven by the adhesion of the turn-up ply 616, overcome the friction force of the shaping drum steel ring tightening device and turn from the outside to the inside around the carcass steel core 614. When stress concentration or high friction occurs in the rim tensioning device, the ply 611 shifts and the bead rubber 612 experiences cumulative deformation. These unintended stress and strain variations between components during the manufacturing process can cause changes in the shaping and positioning dimensions of the semi-finished tire components, ultimately altering the tire's finished properties. Therefore, it is necessary to develop a new tire shaping drum and method to address the issues of ply shifting and bead rubber accumulation in 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 aircraft radial tire front cord displacement and accumulation 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 forming machine main shaft, wherein the left drum is fixedly arranged at the left end of the forming machine main shaft, and the right drum is slidably arranged at the right end of the forming machine main shaft; 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 outside 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 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 to flexibly wrap the tire bead.

[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 face 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 toward 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 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 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 including 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 eccentric in shape, and the circumference of the upper part of the capsule is longer than that of the lower part of the capsule.

[0014] The right drum is sleeved on the main shaft of the molding machine through the 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 aviation radial tire composite shaping drum as described above, comprising the following steps:

[0017] Step S1: installing a tire blank;

[0018] Step S2: The cylinders of the left and right drums are filled with air pressure of 4.0-4.3 bar, and the sliders move radially to tighten the tire beads on both sides of a section of the tire blank;

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

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

[0021] Step S5: The tire cavity inside the tire section is filled with an air pressure of 1.3-1.5 bar, causing the middle portion of the tire body of the tire section to swell and expand. The left and right tire drums move inward as the tire body expands, while maintaining contact between the inner side of the tire bead and the inner side surfaces of the sliders on both sides.

[0022] Step S6: When the two sides of a tire section are at an angle of 40 to 50 degrees, the eccentric capsule is inflated to 1.2 to 1.5 bar, and the surface of the eccentric capsule contacts the surface of the tire section and rotates toward the symmetry line of the eccentric capsule. 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 ply, the shape of a section of the tire blank becomes spindle-shaped, the diameter of the carcass bulge approaches the diameter of the cap ply, 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 decompressed, the tire cavity of a section of the tire blank is decompressed, the tire bead floating flexible bladder is decompressed, the cylinder body is decompressed, the slider is radially contracted, and the compounded tire blank is removed.

[0025] The present invention has the following beneficial effects and advantages: the present invention provides a composite shaping drum for aviation radial tires, which 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 bead floating flexible bladder of the present invention is wrapped around the bead and attached to the bead. The bladder is pressurized with low rigidity, which greatly reduces the friction force area between the bead and the bladder, 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 with a concave curve to meet the requirements of the shaping process of a section of the tire blank 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 blank, the strong frictional outward force generated by the tire bead is significantly reduced, stress concentration in local areas is avoided, and the rotation of the tire bead 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 This is a schematic structural diagram of the composite shaping drum for aviation radial tires of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the left drum and the left tire bead push-down capsule 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 the right tire bead push-down capsule, 210 is the right eccentric capsule, 211 is the lower part of the right eccentric capsule, 212 is the upper part of the right eccentric capsule, and 220 is the right support seat;

[0036] 300 is the right drum, 310 is the right slider, 311 is the inner side of the right slider, 312 is the outer surface of the right slider, 313 is the outer side 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 core shaft of the main shaft of the molding machine, and 520 is the main shaft sleeve of the molding machine;

[0039] 600 is a tire blank, 610 is the tire bead, 611 is the front cord ply, 612 is the tire bead rubber, 613 is the tire bead outer side, 614 is the tire carcass steel core, 615 is the tire bead inner side, and 616 is the tire cord ply.

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

[0041] In order to make the objectives, 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 an aviation radial tire composite shaping drum, 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 forming machine main shaft 500, wherein the left drum 400 is fixedly arranged on the left end of the forming machine main shaft 500, and the right drum 300 is slidably arranged on the right end of the forming 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 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 outside of the 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 via a molding machine main shaft sleeve 520. The molding machine main shaft sleeve 520 is movable 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, which have symmetrical structures, move accordingly.

[0044] In an embodiment of the present invention, the left drum 400 and the right drum 300 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 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 to flexibly wrap the tire bead 610.

[0045] Specifically, see Figure 2 、 Figure 3 As shown, the cylinder body of the left drum 400 includes a left cylinder outer sleeve 440, a left piston 450 and a left cylinder inner sleeve 460, wherein the left cylinder inner sleeve 460 is fixedly connected to the end face of the main shaft core shaft 510 of the molding machine, and the left cylinder outer sleeve 440 is coaxially sleeved on the outside of the left cylinder inner sleeve 460, and a left annular cavity is formed between the left cylinder outer sleeve 440 and the left cylinder 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 fixed to the outer side of the end face of the molding machine main shaft sleeve 520, 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 bladder, and a plurality of sliders, wherein the plurality of sliders are disposed within a plurality of radial guide grooves circumferentially disposed on the cylinder body, and the sliders are capable of sliding radially within the radial guide grooves; the inner side surface of each slider is in contact with the tapered end face of the piston, and the outer surface of each slider has a groove, the sealing ring is sleeved within the groove of each slider, and the two side edges of the sealing ring are fixed to the cylinder body; the tire bead floating flexible bladder is sleeved on the outer side of the sealing ring. When the piston is free of pressure, the tension of the sealing ring causes the sliders to retract in the inner diameter direction; under wind pressure, the piston drives the sliders to move in the outer diameter direction 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 vertical surface of the inverted trapezoid can be vertical or oblique, with the symmetry center line of the left drum 400 and the right drum 300 as the standard, and the two inverted trapezoidal top surface curves are straight surfaces 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. 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 bead floating flexible bladder 430, and multiple left sliders 410. The multiple left sliders 410 are housed in radial guide grooves on the left cylinder housing 440, with the bottom of each left slider 410 engaging the tapered end surface of the left piston 450 via an inclined surface. The left sealing ring 420 fits within a groove on the outer surface 412 of the left slider, and both ends of the left sealing ring 420 are fixed to the left cylinder housing 440. The left bead floating flexible bladder 430 is located outside 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, with the bottom surface gradually increasing from the inside to the outside, so that the length of the outer side 411 of the left slider is shorter 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 bead steel core.

[0053] Specifically, the right drum 300 includes a right sealing ring 320, a right bead float bladder 330, and multiple right sliders 310. The multiple right sliders 310 are housed in radial guide ring grooves on the right cylinder housing 340. The outer surface 312 of the right slider is provided with a groove into which the right sealing ring 320 fits. Both sides of the right sealing ring 320 are fixed to the right cylinder housing 340. The right bead float bladder 330 is located outside 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 including 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 onto the support base to form a closed cavity, with a nozzle connected to the machine pipeline, capable of inflation, pressure maintenance, and deflation. When not inflated, the eccentric capsule has 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.

[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 base 120, wherein the left support base 120 is mounted 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 mounting axis, and the length of the left eccentric capsule upper portion 112 is greater than the length of the left eccentric capsule lower portion 111.

[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 mounted on the outside of the right cylinder housing 340 and can move axially relative to the right cylinder housing 340. After the mounting position is adjusted, the relative position is locked. The right eccentric capsule 210 is eccentric relative to the mounting axis, and the length of the right eccentric capsule upper portion 212 is greater than the length of the right eccentric capsule lower portion 211.

[0058] The present invention provides a composite shaping drum for aviation radial tires, used in the tire forming and manufacturing process. The drum inflates within a sealed chamber formed by a tire blank, a left drum, a right drum, and a main shaft, causing the central portion of the tire body to swell and expand. A section of tire bead material is then rotated inwardly around the carcass steel core, completing the assembly of the cap ply and carcass. The drum precisely controls the deformation of the tire blank from a cylindrical barrel to a spindle shape during the forming process of an aviation radial tire with a positively wrapped ply structure. This eliminates unintended component shifting and deformation during the tire forming process, such as accumulation of bead material. This improves the overall assembly accuracy of the tire components during the shaping process.

[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 pushing capsule 200 is connected to the surface of the right cylinder housing 340, and the positioning relationship is that the eccentric capsule is 40-120 mm axially away from the inner side of the slider; the main shaft core shaft 510 of the forming machine and the main shaft sleeve 520 of the forming machine drive the left drum 400 and the right drum 300 to separate and close, and the positioning relationship is that the distance between the inner side surfaces of the sliders of the left drum 400 and the right drum 300 is consistent with the distance between the inner side surfaces 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 the 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 the 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 an air 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 bladder is filled with a wind pressure of 1.3-1.5 bar, and the tire bead floating flexible bladder completely wraps the tire bead 610;

[0064] Step S4: Increase the air pressure of the bead floating flexible bladder to 5.3-6.0 bar, and reduce the air pressure in the cylinder to 3.2-3.5 bar. The bead floating flexible bladder floats, and the slider maintains a low tension of 2.2-2.5 bar. Optimize the air pressure values ​​of the cylinder and bead floating flexible bladder for the left drum 400 and the right drum 300 by statistically analyzing multiple tests.

[0065] Step S5: The tire cavity 800 inside the tire section 600 is inflated to a pressure of 1.3-1.5 bar. The middle portion of the tire body of the tire section 600 swells and expands. The left drum 400 and the right drum 300 move inward as the tire body expands, while maintaining 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 section 600 are at a 40-50 degree angle, the eccentric bladder is inflated to 1.2-1.5 bar, and the surface of the eccentric bladder contacts the surface of the tire section and rotates toward the symmetry line of the eccentric bladder. The left drum 400 and the right drum 300 continue to move inward, and the eccentric bladder maintains pressure and pushes the tire bead 610 inward and downward.

[0067] Specifically, during the process of the tire blank's cross-section changing from an arc shape to a spindle shape, the tire bead 610 generates an outward force. The inward and downward forces generated by the eccentric capsule are greater than the outward force of the tire bead, 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 ply 700, the shape of a section of the tire blank becomes spindle-shaped, and the diameter of the carcass bulge approaches the diameter of the cap ply, 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 decompressed, the tire cavity 800 of a section of the tire blank 600 is decompressed, the tire bead floating flexible bag is decompressed, the cylinder is decompressed, the slider is radially contracted, and the compounded tire blank is removed.

[0070] The present invention provides a composite tire shaping method that adds a tire bead floating flexible bladder and a tire bead push-down bladder to the shaping drum design. Combined with the shaping method, this method improves overall tire manufacturing quality and eliminates the need for manual repairs after tire formation to compensate for some manufacturing defects. The tire bead is attached to the bead by the bead floating flexible bladder wrapping surface. The bladder is pressurized to achieve low rigidity, significantly reducing the frictional force area between the bead and the bladder, and reducing the reverse friction constraints on the ends of the front cord and the outer rubber. The inward and downward forces generated by the eccentric bladder are greater than the outward force on the bead, preventing contact between the bead and the outer edge of the slider and promoting bead rotation.

[0071] The present invention combines the eccentric capsule and the slider with a concave curve to meet the requirements of the shaping process of a section of the tire blank 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 blank, the strong frictional outward force generated by the tire bead is significantly reduced, stress concentration in local areas is avoided, and the rotation of the tire bead material is promoted.

[0072] The above description is only an embodiment of the present invention and is not intended to limit the scope of protection 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 scope of protection of the present invention.

Claims

1. A composite shaping drum for aviation radial tires, characterized in that: The invention comprises a left bead push-down capsule (100), a right 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 on the left end of the main shaft (500) of the forming machine, and the right drum (300) is slidably arranged on the right end of the main shaft (500) of the forming machine; 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); 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 tapered end surface, the piston is accommodated in the annular cavity of the cylinder body and is slidably matched with the cylinder body; the concave flexible wrapping structure is provided on the cylinder body and contacts the tapered end surface 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 to flexibly wrap the tire bead (610); 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 mounted on the left drum (400) or the right drum (300), and the mounting position can be adjusted along the axial direction; The eccentric capsule is pressed onto the support seat to form a closed cavity. When not pressurized, the eccentric capsule is eccentric in shape, and the circumference of the upper part of the capsule is longer than that of the lower part of the capsule.

2. The composite shaping drum for aviation radial tires according to claim 1, 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 face 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 toward the inner diameter direction.

3. The composite shaping drum for aviation radial tires according to claim 2, 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 symmetrical 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.

4. The composite shaping drum for aviation radial tires according to claim 2, 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.

5. The composite shaping drum for aviation radial tires according to claim 1, 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) is capable of moving axially on the molding machine main shaft (500).

6. The composite shaping drum for aviation radial tires according to claim 5, 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.

7. A tire composite shaping method using the aircraft radial tire composite shaping drum according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1: Installing a tire blank (600); Step S2: The cylinders of the left drum (400) and the right drum (300) are filled with an air pressure of 4.0-4.3 bar, and the sliders move 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 air pressure of the tire bead floating flexible bag to 5.3-6.0 bar, reducing the air pressure in the cylinder to 3.2-3.5 bar, so that the tire bead floating flexible bag floats, and the slider maintains a low tension of 2.2-2.5 bar; Step S5: The tire cavity (800) inside the tire section (600) is filled with a wind pressure of 1.3-1.5 bar, and the middle part of the tire body of the tire section (600) swells and expands. The left drum (400) and the right drum (300) move inward 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 at an angle of 40 to 50 degrees, the eccentric capsule is inflated to 1.2 to 1.5 bar, and the surface of the eccentric capsule abuts against the surface of the 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), the shape of a tire blank is spindle-shaped, the diameter of the tire body 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 decompressed, the tire cavity (800) of a tire blank (600) is decompressed, the tire bead floating flexible bag is decompressed, the cylinder is decompressed, the slider is radially contracted, and the compounded tire blank is removed.

Images