CN217704273U - Rigid core structure and tire mold - Google Patents

Abstract

The disclosure relates to the technical field of vulcanization, in particular to a rigid core structure and a tire mold. The rigid core structure provided by the disclosure comprises a plurality of core segments, wherein two circumferential end surfaces of each core segment are butt joint surfaces; circumferentially, the abutting faces adjacent to each other are engaged with each other to form an annular core body; the outer surface of the core segment includes a cavity surface located within a cavity; and chamfers are formed at the intersection of the butt joint surfaces and the cavity surfaces, and after the adjacent butt joint surfaces are combined, a first exhaust channel is formed between the adjacent chamfers. The gas can be smoothly discharged through the first exhaust passage, the possibility that the gas influences the thickness or the uniformity of the tire air-tight layer is reduced, the exhaust problem when the rigid core structure is used for vulcanizing the tire is solved, the appearance of the vulcanized tire is ensured to meet the requirements, and the vulcanization quality of the tire is improved.

Description

Rigid core structure and tire mold

Technical Field

The disclosure relates to the technical field of vulcanization, in particular to a rigid core structure and a tire mold.

Background

In recent years, in order to improve the performance of tires, it has been proposed to use a rigid core to mold the inner contour of the tire, and the rigid core vulcanized the inner contour of the tire is closer to the design contour than the bladder vulcanized tire, and the performance of the tire is greatly improved.

Because air exists among all parts of the tire blank during molding, the tire also generates air during vulcanization, the joint area between the inner side of the tire blank and the outer contour of the rigid core is large, particularly the middle position of each block of the rigid core, when the exhaust structure design of the rigid core is unreasonable, the air between the rigid core and the tire blank is difficult to exhaust, and the phenomenon that air is trapped between tire parts or trapped in the tire inside vulcanized out of the tire is easy to occur, so that the tire has defects.

Disclosure of Invention

In order to solve the technical problem, the present disclosure provides a rigid core structure and a tire mold.

A first aspect of the present disclosure provides a rigid core structure comprising: a plurality of core segments, each of which has two circumferential end faces as butt-joint faces;

circumferentially, adjacent abutment surfaces mutually engage with each other to form an annular core body;

the outer surface of the core segment includes a cavity surface located within a cavity;

chamfers are formed at the intersection positions of the abutting surfaces and the cavity surfaces, and after the abutting surfaces are combined, a first exhaust channel is formed between the two adjacent chamfers.

Further, the radius R of the chamfer satisfies: r is more than or equal to 0.2mm and less than or equal to 0.5mm.

Further, the outer surface of the core segment comprises a first extension surface and a second extension surface which are respectively connected with the cavity surface, and the first extension surface and the second extension surface are both positioned outside the cavity;

the chamfer extends along the direction of the intersection line of the cavity surface and the butt joint surface and extends to the first extending surface and the second extending surface respectively, so that gas is discharged from the first extending surface and the second extending surface which are not in the cavity.

Furthermore, a second exhaust channel is arranged on the cavity surface, and at least one end of the second exhaust channel is communicated with the first exhaust channel.

Further, the second exhaust passage includes an exhaust groove;

the width L of the exhaust groove satisfies the following condition: l is more than or equal to 0.2mm and less than or equal to 0.5mm, and/or the depth H of the exhaust groove meets the following conditions: h is more than or equal to 0.2mm and less than or equal to 0.5mm.

Furthermore, both ends of the second exhaust passage are communicated with the first exhaust passage;

wherein the second exhaust passage extends along a plane passing through a centerline of the core body, or an extending direction of the second exhaust passage is inclined with respect to a circumferential direction of the core segment.

Further, the second exhaust passage is a patterned recess portion, the patterned recess portion includes a first end and a second end that are communicated with each other, and both the first end and the second end are communicated with the first exhaust passage.

Further, the cross section of the second exhaust channel is semicircular, rectangular or triangular.

Further, the number of the second exhaust passages is plural.

A second aspect of the present disclosure provides a tire mold comprising the rigid core structure of the first aspect.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the rigid core structure provided by the embodiment of the disclosure comprises: a plurality of core segments, each of which has two circumferential end faces as butt-joint faces; in the circumferential direction o, adjacent abutment surfaces are mutually engaged with each other to form an annular core body. The outer surface of the core segment includes a cavity surface located within the cavity; chamfers are formed at the intersection of the abutting surfaces and the cavity surface, and after two adjacent abutting surfaces are combined, a first exhaust channel is formed between the two adjacent chamfers. According to the embodiment of the disclosure, by designing the first exhaust passage, in the tire vulcanization process, gas between the rigid core and the tire blank can be smoothly exhausted through the first exhaust passage, and the possibility that the gas influences the thickness or uniformity of the tire air-tight layer is reduced, so that the exhaust problem when the rigid core is used for vulcanizing the tire is solved, the appearance of the vulcanized tire is ensured to meet the requirement, and the tire vulcanization quality is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic structural view of a rigid core structure according to an embodiment of the disclosure;

FIG. 2 is an enlarged view taken at s in FIG. 1;

FIG. 3 is a side view schematic illustration of a rigid core structure according to an embodiment of the disclosure;

FIG. 4 is an enlarged view taken at w in FIG. 3;

FIG. 5 is a schematic illustration of a side view configuration of a core segment of a rigid core structure according to an embodiment of the disclosure;

FIG. 6 is a schematic view of a cavity face of a core segment in a rigid core structure according to an embodiment of the present disclosure;

FIG. 7 is a schematic illustration of another side view configuration of a core segment in a rigid core structure according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of the structure at x in FIG. 7;

FIG. 9 is a schematic view of the structure at y in FIG. 7;

FIG. 10 is a schematic view of the structure at z in FIG. 7;

FIG. 11 is another view of a cavity face of a core segment in a rigid core structure according to an embodiment of the present disclosure.

Reference numerals are as follows: 1. a core segment; 11. a cavity surface; 12. chamfering; 13. a first extension surface; 14. a second extension surface; 2. a first exhaust passage; 3. a second exhaust passage; 31. an exhaust duct; 32. a recessed portion.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

Referring to fig. 1, 2, 3, and 4, embodiments of the present disclosure provide a rigid core structure including: a plurality of core segments 1, each of the core segments 1 having both circumferential end faces thereof as butt surfaces; in the circumferential direction o, adjacent abutment surfaces are mutually engaged with each other to form an annular core body. That is, the core body may be formed of a plurality of core segments 1 divided in the circumferential direction. Each core segment 1 has abutting surfaces at both end surfaces in the circumferential direction o thereof. The core body is formed in a ring shape by joining abutting surfaces of the core segments 1 to each other in the circumferential direction. The core segment 1 is configured to include first segments and second segments alternately arranged in the circumferential direction. The abutting faces of the first sector on both circumferential sides are inclined in such an orientation that the circumferential width decreases toward the radially inner side. The abutting faces of the second sector on both circumferential sides are inclined in such an orientation that the circumferential width increases toward the radially inner side. Thus, the core body can be disassembled by moving the first segment or the second segment in order toward the radially inner side.

The first sector and the second sector are provided with a driving mechanism, so that the first sector and the second sector can stretch in the radial direction of the cavity to complete splicing. Optionally, the driving mechanism includes a first driving portion and a second driving portion, the first driving portion and the first sector are the same in number and are in one-to-one correspondence, and the second driving portion and the second sector are the same in number and are in one-to-one correspondence; during the mold closing process, the first and second segments can be moved radially outward by the first and second drive sections.

The outer surface of core segment 1 includes cavity face 11 located within the cavity; chamfers 12 are formed at the intersection of the abutting surfaces and the cavity surface 11, and after two adjacent abutting surfaces are combined, a first exhaust channel 2 is formed between two adjacent chamfers 12. According to the embodiment of the disclosure, by designing the first exhaust passage 2, in the tire vulcanization process, gas between the rigid core and the tire blank can be smoothly exhausted through the first exhaust passage 2, and the possibility that the gas influences the thickness or uniformity of the tire air-tight layer is reduced, so that the exhaust problem when the rigid core is used for vulcanizing the tire is solved, the appearance of the vulcanized tire is ensured to meet the requirement, and the tire vulcanization quality is improved.

The butt joint surface and the cavity surface 11 are designed into the chamfer 12 to prevent the inner mold from damaging the inner side of the tire, if the chamfer 12 is not used, other structures with sharp edges are adopted to easily leave obvious edges on the inner side of the tire, the appearance is influenced, the quality is possibly influenced, and the chamfer 12 with smooth transition is selected. In addition, the adjacent two abutting surfaces in the opening and closing process of the inner die have a process of never contacting, and if a chamfer (non-chamfer) or other structures with sharp edges are used, the wall surfaces of the first exhaust channel 2 can be scratched if the positions of the two abutting surfaces are not correct when the two abutting surfaces are attached.

In some embodiments, the radius R of the chamfer 12 satisfies: r is more than or equal to 0.2mm and less than or equal to 0.5mm. If the chamfer 12 is too large, more rubber will fill the chamfer 12 and the tire innerliner will be inherently thin, and if some rubber builds up there the cured tire may have a damaged innerliner or a bare tire sidewall. If the chamfer 12 is too small, it may fill the green tire as it is being spread open, and the chamfer 12 does not function as a vent.

As shown in fig. 1 and 5, the outer surface of the core segment 1 includes a first extension surface 13 and a second extension surface 14 respectively connected to the cavity surface 11, and the first extension surface 13 and the second extension surface 14 are both located outside the cavity; the chamfer 12 extends along the direction of the intersection line of the cavity surface 11 and the abutting surface and extends to the first extension surface 13 and the second extension surface 14, respectively, so that gas is discharged from the first extension surface 13 and the second extension surface 14 which are not in the cavity.

As shown in FIG. 5, the chamfer 12 is defined by m-a-b-c-d-e-n, wherein a-b-c-d-e is the rigid core cavity surface 11. After rounding, the grooves formed by the chamfers 12 between the core segments 1 serve as first gas discharge channels 2 along which a large amount of gas can be discharged from a-m and e-n not in the cavity. In the tire vulcanization process, gas between the rigid core and the tire blank can be smoothly discharged through the first exhaust channel 2, the possibility that the gas influences the thickness or uniformity of the tire air-tight layer is reduced, the problem of exhaust when the rigid core is used for vulcanizing the tire is solved, the appearance of the vulcanized tire meets the requirement, and the tire vulcanization quality is improved.

As shown in fig. 1, 6, 7, 8, 9 and 10, the cavity surface 11 is provided with a second exhaust channel 3, at least one end of the second exhaust channel 3 is communicated with the first exhaust channel 2, so that gas can reach the first exhaust channel 2 among the core segments 1 along the second exhaust channel 3, the gas can be exhausted in time, the possibility that the gas influences the thickness or uniformity of the tire inner liner is reduced, the exhaust problem when the rigid core is used for vulcanizing the tire is solved, the appearance of the vulcanized tire is ensured to meet the requirement, and the quality of tire vulcanization is improved.

Alternatively, the second exhaust passage 3 extends in the circumferential direction.

Alternatively, both ends of the second exhaust passage 3 communicate with the first exhaust passage 2.

In some embodiments, the second exhaust channel 3 includes exhaust grooves 31, and gas can follow the exhaust grooves 31 to the first exhaust channel 2 between the core segments 1 to be exhausted in a timely manner. The width L of the exhaust groove 31 satisfies: l is more than or equal to 0.2mm and less than or equal to 0.5mm, and/or the depth H of the exhaust groove 31 satisfies: h is more than or equal to 0.2mm and less than or equal to 0.5mm. Within the range, the smooth discharge of air between the rigid core and the tire blank can be ensured, and the thickness of the tire airtight layer can not be influenced. If the vent slot 31 is too large, more rubber will fill the vent slot 31 and build up in the vent slot 31 may cause the cured tire to have a damaged inner liner or to have threads exposed in the tire. If the vent groove 31 is too small, it may fill it with glue just as the green tire is stretched, and the vent groove 31 will not vent air.

As shown in fig. 6, both ends of the second exhaust passage 3 communicate with the first exhaust passage 2; wherein the second exhaust passage 3 extends along a plane passing through the centre line of the core body, or the direction of extension of the second exhaust passage 3 is inclined with respect to the plane passing through the centre line of the core body, i.e. the direction of extension of the second exhaust passage 3 is inclined with respect to the circumferential direction of the core segment 1. The air can reach the first exhaust channel 2 between the core segments 1 along the second exhaust channel 3, so that the air can be exhausted in time, the possibility that the air influences the thickness or uniformity of the tire air-tight layer is reduced, the exhaust problem when the rigid core is used for vulcanizing the tire is solved, the appearance of the vulcanized tire is ensured to meet the requirement, and the tire vulcanization quality is improved.

As shown in fig. 11, the second exhaust passage 3 is a pattern-shaped recess 32, and the pattern-shaped recess 32 includes a first end and a second end that communicate with each other, both of which communicate with the first exhaust passage 2. The method comprises the steps of processing pattern depressions on a rigid core cavity surface 11, using the pattern depressions as second exhaust channels 3, enabling the pattern depressions to be finally communicated with first exhaust channels 2 between a core segment 1 and the core segment 1, playing a role of exhausting when a tire is vulcanized, enabling gas to reach the first exhaust channels 2 between the core segments 1 along the depressions 32, enabling the gas to be exhausted in time, reducing the possibility that the gas influences the thickness or uniformity of a tire air-tight layer, solving the problem of exhausting when the rigid core is used for vulcanizing the tire, ensuring that the appearance of the vulcanized tire meets requirements, and improving the quality of tire vulcanization.

Alternatively, the recess 32 may be formed by a plurality of hexagonal recesses which are arranged in sequence to form a pattern.

As shown in fig. 8, 9 and 10, the cross section of the second exhaust duct 3 is circular, rectangular, square or triangular, which ensures smooth exhaust of air between the rigid core and the green tire without affecting the thickness of the tire inner liner.

In some specific embodiments, the number of the second exhaust passages 3 is multiple, so that the gas is exhausted in time, the possibility that the gas influences the thickness or uniformity of the tire inner liner is reduced, the exhaust problem when the rigid core is used for vulcanizing the tire is solved, the appearance of the vulcanized tire is ensured to meet the requirement, and the tire vulcanization quality is improved.

The tire mold provided by the embodiment of the disclosure comprises the rigid core structure provided by the embodiment of the disclosure. Since the tire mold provided by the embodiments of the present disclosure has the same advantages as the rigid core structure provided by the embodiments of the present disclosure, no further description is provided herein.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A rigid core structure, comprising: a plurality of core segments (1), each core segment (1) having two circumferential end faces as butt faces;

circumferentially, the abutting faces adjacent to each other are engaged with each other to form an annular core body;

the outer surface of the core segment (1) comprises a cavity surface (11) located within a cavity;

and chamfers (12) are formed at the intersection of the butt joint surfaces and the cavity surface (11), and after the adjacent butt joint surfaces are combined, a first exhaust channel (2) is formed between the adjacent chamfers (12).

2. A rigid core structure according to claim 1, wherein the radius R of the chamfer (12) satisfies: r is more than or equal to 0.2mm and less than or equal to 0.5mm.

3. A rigid core structure according to claim 1, characterized in that the outer surface of the core segment (1) comprises a first extension surface (13) and a second extension surface (14) connected to the cavity surface (11), respectively, the first extension surface (13) and the second extension surface (14) both being located outside the cavity;

the chamfer (12) extends along the direction of the intersection line of the cavity surface (11) and the abutting surface and extends to the first extending surface (13) and the second extending surface (14) respectively, so that gas is discharged from the first extending surface (13) and the second extending surface (14) which are not in the cavity.

4. A rigid core structure according to any of claims 1 to 3, characterized in that the cavity surface (11) is provided with a second exhaust channel (3), at least one end of the second exhaust channel (3) communicating with the first exhaust channel (2).

5. A rigid core structure according to claim 4, characterized in that the second vent channel (3) comprises a vent slot (31);

the width L of the exhaust groove (31) satisfies the following condition: l is more than or equal to 0.2mm and less than or equal to 0.5mm, and/or the depth H of the exhaust groove (31) satisfies the following condition: h is more than or equal to 0.2mm and less than or equal to 0.5mm.

6. A rigid core structure according to claim 4, characterized in that both ends of the second exhaust channel (3) communicate with the first exhaust channel (2);

wherein the second exhaust channel (3) extends along a plane passing through the centre line of the core body, or the direction of extension of the second exhaust channel (3) is inclined with respect to the circumferential direction of the core segment (1).

7. A rigid core structure according to claim 4, characterized in that the second exhaust channel (3) is a riffled recess (32), the riffled recess (32) comprising a first end and a second end in communication with each other, both the first end and the second end being in communication with the first exhaust channel (2).

8. A rigid core structure according to claim 4, characterized in that the second exhaust channel (3) is semicircular, rectangular or triangular in cross-section.

9. A rigid core structure according to claim 4, characterized in that the number of the second exhaust channels (3) is plural.

10. A tire mold comprising the rigid core structure of any of claims 1 to 9.

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