CN217704273U - Rigid core structure and tire mold - Google Patents

Abstract

The present disclosure relates to the technical field of vulcanization, and in particular, to a rigid core structure and a tire mold. The rigid core structure provided by the present disclosure includes a plurality of core segments, and each core segment has its circumferential end faces as abutting surfaces; in the circumferential direction, the adjacent abutting surfaces are mutually joined to form an annular shape The core body; the outer surface of the core sector includes a cavity surface located in the cavity; a chamfer is formed at the intersection of the abutting surface and the cavity surface, and after the two adjacent abutting surfaces are combined , a first exhaust passage is formed between two adjacent chamfers. The gas can be smoothly discharged through the first exhaust channel, reducing the possibility of the gas affecting the thickness or uniformity of the tire inner liner, thereby solving the exhaust problem when using the rigid core structure to vulcanize the tire, and ensuring that the appearance of the vulcanized tire conforms to the requirements to improve the quality of tire vulcanization.

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 technique

In recent years, in order to improve the performance of the tire, it is proposed to use a rigid core to form the inner contour of the tire. Compared with the tire vulcanized by the bladder, the inner contour of the tire vulcanized by the rigid core is closer to the design contour, and the performance of the tire has been improved. Great improvement.

Because there will be air between the various parts of the green tire during molding, and the tire will also generate gas during the vulcanization process, and the inner side of the green tire and the outer contour of the rigid core have a larger bonding area, especially in the middle of each block of the rigid core. When the design of the exhaust structure of the rigid core is unreasonable, it is difficult to discharge the air between it and the blank, and the vulcanized tire is prone to air pockets or gas trapped between tire components, resulting in tire defects.

Contents of the invention

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

The first aspect of the present disclosure provides a rigid core structure, including: a plurality of core segments, and each core segment uses its circumferential two ends as butt joint surfaces;

In the circumferential direction, adjacent abutting surfaces engage with each other to form an annular core body;

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

A chamfer is formed at the intersection of the butt joint surface and the cavity surface, and after two adjacent butt joint surfaces are combined, a first exhaust channel is formed between the two adjacent chamfers.

Further, the radius R of the chamfer satisfies: 0.2mm≤R≤0.5mm.

Further, the outer surface of the core sector includes a first extension surface and a second extension surface respectively connected to the cavity surface, and the first extension surface and the second extension surface are located outside the cavity;

The chamfer extends along the direction of the intersection line where the cavity surface intersects the butt surface, and extends to the first extension surface and the second extension surface respectively, so that the gas is not in the cavity from the first extension surface. The extension face and the second extension face are discharged.

Further, the cavity surface is provided with a second exhaust channel, and at least one end of the second exhaust channel communicates with the first exhaust channel.

Further, the second exhaust passage includes exhaust grooves;

The width L of the exhaust groove satisfies: 0.2mm≤L≤0.5mm, and/or, the depth H of the exhaust groove satisfies: 0.2mm≤H≤0.5mm.

Further, both ends of the second exhaust passage communicate with the first exhaust passage;

Wherein, the second exhaust channel extends along a plane passing through the centerline of the core body, or, the extending direction of the second exhaust channel is inclined relative to the circumferential direction of the core sector.

Further, the second exhaust channel is a pattern-shaped recessed portion, and the pattern-shaped recessed portion includes a first end and a second end that communicate with each other, and the first end and the second end are connected to the The first exhaust passage is connected.

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

Further, the number of the second exhaust channels is multiple.

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

Compared with the prior art, the technical solutions provided by the embodiments of the present disclosure have the following advantages:

The rigid core structure provided by the embodiments of the present disclosure includes: a plurality of core segments, and each core segment uses its circumferential two end faces as butt surfaces; in the circumferential direction o, the adjacent butt faces are joined to each other to An annular core body is formed. The outer surface of the core sector includes the cavity surface located in the cavity; a chamfer is formed at the intersection of the butt surface and the cavity surface, and after the two adjacent butt surfaces are combined, a chamfer is formed between the adjacent two chamfers. first exhaust channel. The embodiments of the present disclosure design the first exhaust channel so that during the tire vulcanization process, the gas between the rigid core and the green tire can be smoothly discharged through the first exhaust channel, reducing the impact of the gas on the thickness or uniformity of the tire inner liner. Possibility, so as to solve the exhaust problem when using a rigid core to vulcanize tires, ensure that the appearance of the vulcanized tire meets the requirements, and improve the quality of tire vulcanization.

Description of drawings

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

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings without paying creative labor.

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

Figure 2 is an enlarged view at s in Figure 1;

3 is a schematic side view of the rigid core structure described in the embodiment of the present disclosure;

Figure 4 is an enlarged view at w in Figure 3;

5 is a schematic side view of the core sector in the rigid core structure according to the embodiment of the present disclosure;

6 is a schematic diagram of the cavity surface of the core sector in the rigid core structure according to the embodiment of the present disclosure;

Fig. 7 is another side view structural schematic diagram of the core sector in the rigid core structure according to the embodiment of the present disclosure;

Fig. 8 is a schematic diagram of the structure at x in Fig. 7;

Fig. 9 is a schematic diagram of the structure at y in Fig. 7;

Fig. 10 is a schematic diagram of the structure at z in Fig. 7;

Fig. 11 is another schematic view of the cavity surface of the core segment in the rigid core structure according to the embodiment of the present disclosure.

Reference signs: 1. core segment; 11. cavity surface; 12. chamfer; 13. first extension surface; 14. second extension surface; 2. first exhaust passage; 3. second exhaust Channel; 31, exhaust groove; 32, depression.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, in the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the present disclosure, but the present disclosure can also be implemented in other ways than described here; obviously, the embodiments in the description are only some of the embodiments of the present disclosure, and Not all examples.

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, the rigid core structure provided by the embodiment of the present disclosure includes: a plurality of core segments 1, and each core segment 1 uses its circumferential two ends as the butt joint surfaces ; In the circumferential direction o, the adjacent butt surfaces are joined to 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 on both ends in the circumferential direction o. The core body is formed in a ring shape by joining the butt faces 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 arranged alternately in the circumferential direction. The abutting surfaces on both sides in the circumferential direction of the first sector are inclined in such a direction that the circumferential width decreases toward the radially inner side. The abutting surfaces on both sides in the circumferential direction of the second sector are inclined in such a direction that the circumferential width increases toward the radially inner side. Thus, the core body can be decomposed by moving the first sector or the second sector sequentially toward the inner side of the radial direction.

The first sector and the second sector are equipped with a driving mechanism, so that they can expand and contract in the radial direction of the cavity to complete splicing. Optionally, the driving mechanism includes a first driving part and a second driving part, the number of the first driving part is the same as that of the first sector, and there is a one-to-one correspondence, and the number of the second driving part is the same as that of the second sector, and there is a one-to-one correspondence ; During the mold clamping process, the first sector and the second sector can be moved radially outward by the first drive part and the second drive part.

The outer surface of the core sector 1 includes a cavity surface 11 located in the cavity; a chamfer 12 is formed at the intersection of the butt surface and the cavity surface 11, and after the two adjacent butt surfaces are combined, the adjacent two chamfers The first exhaust passage 2 is formed between the corners 12 . The embodiments of the present disclosure design the first exhaust channel 2 so that during the tire vulcanization process, the gas between the rigid core and the green tire can be discharged smoothly through the first exhaust channel 2, reducing the impact of the gas on the thickness or uniformity of the tire inner liner. It can solve the exhaust problem when using a rigid core to vulcanize tires, ensure that the appearance of the vulcanized tire meets the requirements, and improve the quality of tire vulcanization.

The butt surface and the cavity surface 11 are designed as chamfers 12 to prevent the inner mold from being damaged on the inner side of the tire. If the chamfering 12 is not used and other structures with sharp edges are used, it is easy to leave obvious edges on the inner side of the tire, affecting the appearance. It may also affect the quality, so the chamfer 12 with a smooth transition is selected. In addition, during the opening and closing process of the internal mold, there will be a process from no contact to contact between the two adjacent butt surfaces. If chamfers (non-chamfers) or other structures with sharp edges are used, then the two butt surfaces will be in a good fit. If the position is not correct, the wall surface forming the first exhaust passage 2 may be scratched.

In some specific embodiments, the radius R of the chamfer 12 satisfies: 0.2mm≤R≤0.5mm. If the chamfer 12 is too large, more sizing material will be filled into the chamfer 12, and the inner liner of the tire is very thin. If a part of the sizing material accumulates here, the vulcanized tire may have a Injury, or the appearance of thread exposure in the tire. If the chamfer 12 is too small, the rubber material may fill up here when the tire blank is just stretched, so the chamfer 12 will not have the effect of exhausting.

1 and 5, the outer surface of the core sector 1 includes a first extension surface 13 and a second extension surface 14 respectively connected to the cavity surface 11, 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 where the cavity surface 11 intersects with the butt surface, and extends to the first extension surface 13 and the second extension surface 14 respectively, so that the gas never enters the second extension surface in the cavity One extension surface 13 and a second extension surface 14 exit.

As shown in FIG. 5 , the opening range of the chamfer 12 is m-a-b-c-d-e-n, wherein a-b-c-d-e is the cavity surface 11 of the rigid core. After being rounded, the groove formed by the chamfer 12 between the core segments 1 can serve as the first exhaust channel 2, and a large amount of gas can be discharged along the groove from a-m and e-n that are not in the cavity. During the tire vulcanization process, the gas between the rigid core and the green tire can be smoothly discharged through the first exhaust channel 2, reducing the possibility of the gas affecting the thickness or uniformity of the tire inner liner, thereby solving the problem of using a rigid core to vulcanize the tire. When the exhaust problem occurs, ensure that the appearance of the vulcanized tire meets the requirements, and improve the quality of the vulcanized tire.

1 and 6, 7, 8, 9 and 10, the cavity surface 11 is provided with a second exhaust passage 3, at least one end of the second exhaust passage 3 is connected to the first exhaust passage 2 Connected, so that the gas can reach the first exhaust channel 2 between the core segments 1 along the second exhaust channel 3, so that the gas can be discharged in time, reducing the possibility of the gas affecting the thickness or uniformity of the tire inner liner , so as to solve the exhaust problem when using a rigid core to vulcanize tires, ensure that the appearance of the vulcanized tire meets the requirements, and improve the quality of tire vulcanization.

Optionally, the second exhaust passage 3 extends along the circumferential direction.

Optionally, both ends of the second exhaust channel 3 communicate with the first exhaust channel 2 .

In some specific embodiments, the second exhaust channel 3 includes exhaust grooves 31 , and the gas can reach the first exhaust channel 2 between the core segments 1 along the exhaust grooves 31 , so that the gas can be discharged in time. The width L of the exhaust groove 31 satisfies: 0.2mm≤L≤0.5mm, and/or, the depth H of the exhaust groove 31 satisfies: 0.2mm≤H≤0.5mm. Within this range, the smooth discharge of the air between the rigid core and the green tire can be ensured without affecting the thickness of the tire inner liner. If the vent groove 31 is too large, more rubber will be filled into the vent groove 31, and the accumulation of the rubber in the vent groove 31 will cause damage to the inner liner of the vulcanized tire, or the occurrence of tire defects. Exposure situation. If the exhaust groove 31 is too small, the sizing material may fill up here just when the tire base is stretched, so the exhaust groove 31 will not be able to exhaust the air.

As shown in Figure 6, both ends of the second exhaust passage 3 are in communication with the first exhaust passage 2; wherein, the second exhaust passage 3 extends along a plane passing through the centerline of the core body, or the second row The extending direction of the gas passage 3 is inclined relative to the plane passing through the centerline of the core body, that is, the extending direction of the second exhaust passage 3 is inclined relative to the circumferential direction of the core sector 1 . The gas can reach the first exhaust channel 2 between the core segments 1 along the second exhaust channel 3, so that the gas can be discharged in time, reducing the possibility of the gas affecting the thickness or uniformity of the tire inner liner, thereby Solve the exhaust problem when using a rigid core to vulcanize tires, ensure that the appearance of the vulcanized tire meets the requirements, and improve the quality of tire vulcanization.

As shown in Figure 11, the second exhaust channel 3 is a pattern-shaped recessed portion 32, the pattern-shaped recessed portion 32 includes a first end and a second end connected to each other, and the first end and the second end are connected to the first row. Gas channel 2 is connected. The pattern depression is processed on the rigid core cavity surface 11, and the pattern depression is used as the second exhaust channel 3, and the pattern depression can finally be connected to the first exhaust channel between the core sector 1 and the core sector 1 2 communication, can play the role of exhaust during tire vulcanization, the gas can reach the first exhaust channel 2 between the core segments 1 along the concave part 32, so that the gas can be discharged in time, reducing the impact of the gas on the airtightness of the tire The possibility of thickness or uniformity of the layer, so as to solve the exhaust problem when using a rigid core to vulcanize the tire, ensure that the appearance of the vulcanized tire meets the requirements, and improve the quality of the tire vulcanization.

Optionally, the recessed part 32 may be formed by a plurality of hexagonal grooves, and the plurality of hexagonal grooves are arranged in sequence to form a pattern.

As shown in Fig. 8, Fig. 9 and Fig. 10, the cross-section of the second exhaust channel 3 is circular, rectangular, square or triangular, which can ensure the smooth discharge of the air between the rigid core and the green tire without affecting the tire. The thickness of the airtight layer.

In some specific embodiments, the number of the second exhaust passage 3 is multiple, so that the gas can be discharged in time, reducing the possibility of the gas affecting the thickness or uniformity of the tire inner liner, thereby solving the problem of using a rigid core vulcanization To solve the exhaust problem of tires, ensure that the appearance of vulcanized tires meets the requirements, and improve the quality of tire vulcanization.

The tire mold provided by the embodiments of the present disclosure includes the rigid core structure provided by the embodiments of the present 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, details are not repeated here.

It should be noted that in this article, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these No such actual relationship or order exists between entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above descriptions are only specific implementation manners of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described 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.

Images