CN-122008607-A - Tile-increasing radial forming drum and tire secondary forming process

CN122008607ACN 122008607 ACN122008607 ACN 122008607ACN-122008607-A

Abstract

The invention discloses a tile-increasing radial forming drum and a tire secondary forming process, and belongs to the technical field of tire forming equipment. The forming drum comprises a main shaft, a driving assembly and a tile assembly, wherein the tile assembly comprises main tiles and secondary tiles alternately arranged at intervals along the circumferential direction of the main shaft, the adjacent side walls of the main tiles and the secondary tiles are provided with concave-convex curved surface sliding guide structures which are always in sliding contact in the radial movement process, the driving assembly comprises an inner sliding seat and an outer sliding seat which are respectively connected with the main tiles and the secondary tiles through a main connecting rod and a secondary connecting rod, the inner sliding seat and the outer sliding seat are driven by the same driving source and synchronously and coaxially move, and the process comprises the steps of shrinkage preparation, material lamination, uniform-speed drum expansion, secondary method forming and demoulding. According to the invention, the cambered surface span is reduced by increasing the number of tiles, and the uneven stretching problem of a carcass material is solved by combining the concave-convex sliding guiding structure and layered synchronous driving, so that the tire molding quality and uniformity are improved.

Inventors

CHEN XIANSONG
LI XIAOHU
DONG WENXIAO
TIAN HUIJUN
Liu Yonghuang
YU GUANGYI

Assignees

贵州轮胎股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260408

Claims (10)

1. The shoe-increasing radial forming drum is characterized by comprising a main shaft, a driving assembly and a shoe assembly; the driving assembly comprises an inner sliding seat and an outer sliding seat which are coaxially sleeved on the main shaft; the inner slide seat and the outer slide seat are driven by the same driving source and synchronously move in the same direction and axially so as to drive the main tile and the secondary tile to synchronously and radially expand and contract; The tile assembly comprises main tiles and secondary tiles which are alternately arranged at intervals along the circumferential direction of the main shaft; The main tile block is connected with the inner sliding seat through a main connecting rod; the secondary tile is connected with the outer slide seat through a secondary connecting rod; The number of the primary tiles is 9-27, and the number of the secondary tiles is consistent with that of the primary tiles; The total number of the main tiles and the secondary tiles is 18-54, and the central angle of the cambered surface of each tile is less than or equal to 20 degrees; the adjacent side walls of the main tile and the secondary tile are provided with concave-convex curved surface sliding guide structures which always keep sliding contact in the radial movement process.
2. A shoe-added radial forming drum according to claim 1, wherein the concave-convex curved surface guide sliding structure comprises a convex curved surface and a concave curved surface; the convex cambered surface is arranged on the side wall of the main tile; the concave cambered surface is arranged on the side wall of the secondary tile; the curvature radius of the convex cambered surface is equal to that of the concave cambered surface, and the fit clearance between the convex cambered surface and the concave cambered surface is less than or equal to 0.1mm when the tile moves radially.
3. A shoe-added radial forming drum according to claim 1, wherein the driving source is a hydraulic driving cylinder or a servo electric cylinder; a displacement difference compensation mechanism is arranged between the inner sliding seat and the outer sliding seat; The displacement difference compensation mechanism is used for monitoring and adjusting the axial displacement difference between the inner slide seat and the outer slide seat, so that the radial height difference between the main tile and the secondary tile is less than or equal to 0.05mm.
4. The shoe-added radial forming drum according to claim 1, wherein the main connecting rod and the secondary connecting rod are equal in length, and the outer surfaces of the main shoe and the secondary shoe are coated with elastic buffer layers; the thickness of the elastic buffer layer is 0.5-1.2 mm, and the surface roughness Ra is less than or equal to 0.6 mu m.
5. A shoe-increasing radial forming drum according to claim 1, wherein the mating surface of the concave-convex curved surface sliding guide structure is provided with a wear-resistant coating, and the primary shoe and the secondary shoe are made of high-strength aluminum alloy or alloy steel materials.
6. A shoe-added radial building drum according to claim 1, wherein the number of primary and secondary shoes is adjustable according to tire specifications, wherein: when the device is used for riding a tire, the sum of the number of the main tiles and the number of the secondary tiles is 24, and the central angle of each tile is 15 degrees; When the device is used for loading tires, the sum of the number of the main tiles and the number of the secondary tiles is 36, and the central angle of each tile is 10 degrees; when the combined type tire is used for engineering tires, the sum of the number of the main tiles and the number of the secondary tiles is 48, and the central angle of each tile is 7.5 degrees.
7. The secondary tire molding process is characterized by comprising the following steps of: s1, driving the main tile and the secondary tile to synchronously shrink along the radial direction through a driving assembly, so that the radial size of the drum surface is reduced to 75% -82% of the inner diameter of a carcass of a target tire; S2, attaching the carcass material to the contracted drum surface; S3, driving the main tile and the secondary tile to expand at a uniform speed along the radial direction at a synchronous speed of 3-12 mm/S through the driving assembly until the drum surface reaches the preset inner diameter of the tire carcass, wherein the radial height difference between any adjacent main tile and secondary tile in the drum expansion process is less than or equal to 0.05mm; S4, in a drum surface stable state, lamination, turn-up and rolling are performed stably, symmetry and firmness of each half part and each buckling ring are ensured, uniformity and strength of the tire are improved, and meanwhile, a precise compounding procedure of a tire body and a tread compound piece is completed; S5, driving the main tile and the secondary tile to synchronously shrink along the radial direction through the driving assembly, so that the formed tire body is separated from the drum surface, and demolding is completed.
8. The secondary tire building process according to claim 7, wherein the carcass material in S2 is supported and attached to the drum surface in a multipoint continuous manner, and the initial attaching flatness error is less than or equal to 0.3mm.
9. The secondary tire building process according to claim 7, wherein the speed of the drum is controlled in gradient according to the tire specification during the drum expansion process, specifically: The drum expansion speed of the passenger tire is 10-12 mm/s; the drum expansion speed of the load-carrying tire is 8-10 mm/s; The drum expansion speed of the engineering tire is 3-5 mm/s.
10. A tire building process according to claim 7, wherein the stretching error of each position of the carcass material during the inflation is 0.5% -0.8%.

Description

Tile-increasing radial forming drum and tire secondary forming process Technical Field The invention relates to the technical field of tire building equipment, in particular to a tile-increasing radial forming drum and a tire secondary method forming process. Background The tire secondary method forming process is a classical method for forming the tire in two stages, wherein the second stage forming is completed on a radial forming drum to finish the working procedures of half part lamination, turn-up, rolling, bead ring buckling and the like. The existing radial forming drum generally adopts a combined structure of a main shaft, a driving assembly and a tile assembly, and the driving assembly drives the tile to radially expand and contract to form and demould a carcass. However, in the prior art, 6+6 or 8+8 tile block configuration is generally adopted, the cambered surface span of a single tile block is overlarge, the stretching amounts of all positions of a carcass material are inconsistent in the radial stretching process, and defects such as exposed lines of an inner liner layer, curtain fabric deviation and the like are easy to occur. In view of the foregoing, various technical improvements have been made in the industry. For example, the utility model patent with publication number CN202021563710.2 discloses a tile group and a radial telescopic tire shaping drum, and adopts a structure that main tiles and secondary tiles are mutually matched and arranged at intervals, so that the problem of bubble residue when a supporting rubber carcass is attached is solved. The utility model patent application with the publication number of CN103831985A discloses a giant engineering tire building drum, which adopts a mode of combining a wide drum tile with a narrow drum tile and obliquely shrinking a narrow drum shoulder to avoid tangential extrusion of the drum shoulder to a tire blank. However, the problems of limited tile quantity, large splicing gap, insufficient synchronous driving precision of multiple tiles and the like still exist in the scheme, so that uneven stretching of a carcass material and out-of-tolerance of drum head jumping are caused, and uniformity and durability of a tire finished product are affected. Therefore, there is a need for a shoe-added radial forming drum and a corresponding tire secondary forming process capable of solving the problem of stretching uniformity of a carcass material, eliminating a drum head splicing gap and improving the synchronous driving precision of a plurality of shoe blocks, so as to overcome the defects in the prior art. Disclosure of Invention In order to overcome the above-mentioned drawbacks of the prior art, the present invention provides a shoe-increasing radial forming drum and a tire secondary forming process, which solve the above-mentioned problems in the prior art. In a first aspect, an embodiment of the present application provides a shoe-added radial forming drum, which is characterized by comprising a main shaft, a driving assembly and a shoe assembly; the driving assembly comprises an inner sliding seat and an outer sliding seat which are coaxially sleeved on the main shaft; The main tile block is connected with the inner sliding seat through a main connecting rod; The secondary tile is connected with the outer slide seat through a secondary connecting rod; the inner slide seat and the outer slide seat are driven by the same driving source and synchronously move in the same direction and axially so as to drive the main tile and the secondary tile to synchronously expand and contract radially; the tile assembly comprises main tiles and secondary tiles which are alternately arranged at intervals along the circumferential direction of the main shaft; the number of the main tiles is 9-27, and the number of the secondary tiles is consistent with that of the main tiles; The total number of the main tiles and the secondary tiles is 18-54, and the central angle of the cambered surface of each tile is less than or equal to 20 degrees; the adjacent side walls of the main tile and the secondary tile are provided with concave-convex curved surface sliding guide structures which always keep sliding contact in the radial movement process. In some embodiments of the present application, the concave-convex curved surface sliding guide structure includes a convex curved surface and a concave curved surface; The convex cambered surface is arranged on the side wall of the main tile block; the concave cambered surface is arranged on the side wall of the secondary tile; the curvature radius of the convex cambered surface is equal to that of the concave cambered surface, and the fit clearance between the convex cambered surface and the concave cambered surface is less than or equal to 0.1mm when the tile moves radially. In some embodiments of the application, the drive source is a hydraulic drive cylinder or a servo electric cylinder; A displacement difference compens