Exhaust sleeve assembly and traceless exhaust tire mold

Abstract

The utility model discloses an exhaust sleeve assembly and a traceless exhaust tire mold. The exhaust sleeve assembly comprises an exhaust sleeve and an inner core, the inner core is fixed in the exhaust sleeve, the inner core is made of hard materials and provided with breathable holes, and the hole diameter of the holes is smaller than 0.03 mm. The air exhausting device can be used for exhausting air in the tire vulcanization process, air correction and rubber edges are avoided after the tire is vulcanized, the product quality is improved, and meanwhile the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tire molds, in particular to an exhaust sleeve component and a tire mold with traceless exhaust. Background Art

[0002] Existing tires are manufactured and molded by special tire molds. As described in the Chinese invention patent with publication number CN111757800A, the existing tire mold includes a tread embossing body and a sidewall body. The tread embossing body is composed of multiple embossing body segments arranged along the circumference of the tire; the sidewall body is composed of two upper and lower sidewall plates. During the tire vulcanization molding process, it is necessary to exhaust the air between the rubber tire blank and the tire mold molding cavity to avoid rubber shortage during tire vulcanization due to air accumulation.

[0003] At present, the mainstream exhaust method is to exhaust through a stainless steel gas sleeve, that is, to fix a stainless steel gas sleeve in the exhaust holes of the embossed body segment to exhaust through the gas sleeve. However, under high temperature and high pressure conditions, the softened rubber will enter the inner hole of the exhaust sleeve and produce air entanglement or rubber edge. Subsequently, personnel need to be arranged to cut the air entanglement or rubber edge, which increases labor and time costs and also affects product quality. Utility Model Content

[0004] The utility model provides an exhaust sleeve assembly and a tire mold with traceless exhaust, which are used for exhausting the tire during the vulcanization process. After the tire is vulcanized, no air entanglement or rubber edge is generated, thereby improving product quality and reducing production costs.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] According to the first aspect of the utility model, an embodiment of the utility model provides an exhaust sleeve assembly, including an exhaust sleeve and an inner core, wherein the inner core is fixed in the exhaust sleeve, the inner core is made of a hard material and has air-permeable pores, and the pore diameter of the pores is less than 0.03 mm.

[0007] In some embodiments, the exhaust sleeve includes an inserting portion and a clamping portion which are distributed along its axial direction and connected to each other, the inserting portion is used to be inserted into the exhaust hole, and the clamping portion is used to be interference fit with the exhaust hole.

[0008] In some embodiments, in a direction along the axial direction of the exhaust sleeve and away from the clamping portion, an outer diameter of an end of the inserting portion away from the clamping portion gradually decreases.

[0009] In some embodiments, the insertion portion has a first air hole, the clamping portion has a second air hole connected to the first air hole, the aperture of the second air hole is larger than the aperture of the first air hole, and the inner core is fixed in the second air hole.

[0010] In some embodiments, the inner core is interference fit with the exhaust sleeve.

[0011] In some embodiments, the inner core is made of CORRAX steel or 18N i300 metal powder.

[0012] In some embodiments, the inner core is made of CORRAX steel by metal 3D printing, and the density of the inner core is 6.4-6.6 kg / m3; or, the inner core is made of 18Ni300 metal powder by metal 3D printing, and the density of the inner core is 6.75-6.95 kg / m3.

[0013] In some embodiments, the pores have a pore size of 0.005 mm-0.01 mm.

[0014] According to the second aspect of the utility model, an embodiment of the utility model provides a tire mold with seamless exhaust, comprising a tread embossing body, a sidewall body, and a plurality of exhaust sleeve assemblies as described in any one of the first aspects above, wherein the inner sides of the tread embossing body and the sidewall body are each provided with a plurality of exhaust holes extending through to their outer sides, and the exhaust sleeve is fixed in the exhaust hole.

[0015] The utility model has at least the following beneficial effects: an inner core is fixed in the exhaust sleeve of the utility model, the inner core is made of hard material and has air-permeable pores, the pore diameter of the pores is less than 0.03mm, during the vulcanization process, the rubber softened by high temperature and high pressure cannot penetrate into the pores, and no air knots or rubber edges will be generated on the tire surface, thereby improving the quality of the product, and the pores can be used for exhaust, ensuring that the gas generated during the vulcanization process can be discharged smoothly; at the same time, compared with the traditional method, the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional schematic diagram of an exhaust sleeve and an inner core of an embodiment of the utility model;

[0017] Figure 2 This is a schematic structural diagram of an embossed body section observed from the inside in one embodiment of the utility model;

[0018] Figure 3 This is a schematic structural diagram of the embossed body segment observed from the outside in one embodiment of the utility model.

[0019] Wherein, the accompanying drawings are marked as follows:

[0020] The embossed body is segmented 100, the exhaust hole 101, the convex ridge 110, and the forming groove 120;

[0021] Exhaust sleeve 200, insertion portion 210, first air hole 211, clamping portion 220;

[0022] Inner core 300. DETAILED DESCRIPTION

[0023] The utility model provides the following description with reference to the accompanying drawings to help fully understand the various embodiments of the utility model as defined by the claims and their equivalents. The description includes various specific details to help understanding, but these details should be regarded as exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the utility model.

[0024] In the description of the present invention, descriptions of orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] It will be understood that when one element (eg, a first element) is “connected” to another element (eg, a second element), the element may be directly connected to the other element or an intervening element (eg, a third element) may be present between the element and the other element.

[0026] The embodiment of the utility model provides an exhaust sleeve assembly, such as Figure 1 As shown, it includes an exhaust sleeve 200 and an inner core 300, the exhaust sleeve 200 has a perforation, the inner core 300 is fixed in the perforation of the exhaust sleeve 200, the inner core 300 is made of a hard material and has air-permeable pores, and the pore diameter of the pores is less than 0.03mm. When using the exhaust sleeve assembly of this embodiment, it needs to be fixed in the exhaust holes of the tread embossing body and the sidewall body. Since the inner core 300 is made of a hard material, under a high-pressure environment, the mechanical properties of the inner core 300 can meet the pressure requirements of the mold inside the molding cavity during the tire vulcanization process. At the same time, the inner core 300 has air-permeable pores, and the pore diameter of the pores is less than 0.03mm. Through the tire vulcanization experiment, the pores of this pore diameter prevent the softened rubber from penetrating into the pores, and no air knots or rubber edges will be generated on the tire surface, which improves the quality of the product, and the pores can be exhausted, ensuring that the gas generated during the vulcanization process can be discharged smoothly. Compared with the traditional exhaust method, this embodiment does not require manual cutting of the air correction or rubber edge, which reduces labor costs, simplifies the process, and reduces the overall production cost. When the mold needs to be cleaned and maintained, existing cleaning methods such as sandblasting, dry ice, and laser can be applied without special restrictions.

[0027] In some embodiments, the exhaust sleeve 200 includes an inserting portion 210 and a clamping portion 220 which are distributed along its axial direction and connected to each other. The inserting portion 210 is used to be inserted into the exhaust hole of the tread embossing body and the sidewall body, and the clamping portion 220 is used to be interference fit with the exhaust hole. During installation, the inserting portion 210 is inserted into the exhaust hole from the inner side of the tread embossing body and the sidewall body, and then the clamping portion 220 is inserted into the exhaust hole, so that the clamping portion 220 is clamped in the exhaust hole. This structure makes installation easier. At the same time, the outer wall of the clamping portion 220 can be close to the exhaust hole, reducing the gap between the outer wall of the clamping portion 220 and the inner wall of the exhaust hole, so that the softened rubber will not enter between the outer wall of the clamping portion 220 and the inner wall of the exhaust hole, avoiding the generation of air knots or rubber edges.

[0028] Furthermore, along the axial direction of the exhaust sleeve 200 and in the direction away from the clamping portion 220, the outer diameter of the end of the insertion portion 210 away from the clamping portion 220 gradually decreases to form a conical structure, which facilitates the insertion of the end of the insertion portion 210 away from the clamping portion 220 into the exhaust hole, and as the insertion depth of the insertion portion 210 increases, the outer wall of the clamping portion 220 is gradually guided to fit tightly against the inner wall of the exhaust hole to achieve an interference fit.

[0029] In some embodiments, the inserting portion 210 has a first air hole 211, the clamping portion 220 has a second air hole connected to the first air hole 211, the aperture of the second air hole is larger than the aperture of the first air hole 211, and the inner core 300 is fixed in the second air hole. In this way, the inner core 300 may not be provided in the first air hole 211, which reduces the amount of the inner core 300 and further reduces the production cost. At the same time, since the aperture of the second air hole is larger than the aperture of the first air hole 211, a step-like structure is formed at the connection between the second air hole and the first air hole 211, which can limit the movement of the inner core 300 to the first air hole 211. In a high-pressure environment, the inner core 300 can be kept in the second air hole, ensuring that no air knots or rubber edges are generated on the tire surface, and also ensuring that the gas generated during the vulcanization process can be discharged smoothly.

[0030] In some embodiments, the inner core 300 and the exhaust sleeve 200 are interference-fitted, making the installation of the inner core 300 simpler and more convenient.

[0031] In some embodiments, the inner core 300 is made of CORRAX steel or 18N i 300 metal powder. The above material has sufficient hardness and its mechanical properties fully meet the pressure requirements of the mold inside the molding cavity during the tire vulcanization process. At the same time, a structure with pores can be manufactured through corresponding processes for exhaust.

[0032] In one embodiment, the inner core 300 is made of CORRAX steel by metal 3D printing. By adjusting the relevant parameters of laser melting, the inner core 300 with a density of 6.4-6.6 kg / m3 can be obtained, so that the inner core 300 has honeycomb pores.

[0033] In another embodiment, the inner core 300 is made of 18N i 300 metal powder by metal 3D printing. By adjusting relevant parameters of laser melting, the inner core 300 with a density of 6.75-6.95kg / m3 can be obtained, so that the inner core 300 has honeycomb pores.

[0034] Furthermore, the pores of the inner core 300 made in the above two embodiments may have a pore size of 0.005 mm-0.01 mm. This size range can ensure that the gas in the molding cavity can be discharged smoothly, and at the same time, the softened rubber will not penetrate into the pores.

[0035] The embodiment of the utility model also provides a tire mold with traceless exhaust, such as Figure 1-3 As shown, it includes a tread embossing body, a sidewall body and a plurality of exhaust sleeve assemblies. The tread embossing body includes a plurality of embossing body segments 100, and the plurality of embossing body segments 100 can be arranged along the circumference of the tire to form an annular tread embossing body. Since the sidewall body already belongs to the prior art, it will not be described in detail in this embodiment. The inner side surface of the embossing body segment 100 (the side close to the center of the tread embossing body) constitutes the inner side wall of the molding cavity, and the tire is molded in the molding cavity. The inner side surface of the tread embossing body is provided with ridges 110 and / or grooves for molding the pattern on the tire. Specifically, the inner side surface of the tread embossing body can be provided with only ridges 110, or the inner side surface of the tread embossing body can be provided with only grooves, or the inner side surface of the tread embossing body can be provided with both ridges 110 and grooves. Those skilled in the art will select the specific structure of the ridges 110 and / or grooves according to the needs of tire molding.

[0036] The inner sides of the tread embossing body and the sidewall body are also provided with a plurality of exhaust holes 101 extending to the outer sides thereof, that is, the exhaust holes 101 on the tread embossing body extend from the inner side of the tread embossing body to the outer side of the tread embossing body, and the exhaust holes on the sidewall body extend from the inner side of the sidewall body to the outer side of the sidewall body, so as to discharge the gas in the molding cavity.

[0037] The exhaust sleeve assembly includes an exhaust sleeve 200 and an inner core 300. The exhaust sleeve 200 is fixed in the exhaust hole 101 of the tread embossing body and the sidewall body. The exhaust sleeve 200 has a perforation, and the inner core 300 is fixed in the perforation of the exhaust sleeve 200. The inner core 300 is made of a hard material so that the mechanical properties of the inner core 300 can meet the pressure requirements of the mold inside the molding cavity during the tire vulcanization process under high pressure. At the same time, the inner core 300 has air-permeable pores, and the pore diameter of the pores is less than 0.03mm. Through the tire vulcanization experiment, the pores of this pore diameter prevent the softened rubber from penetrating the pores, and no air knots or rubber edges will be generated on the tire surface, which improves the quality of the product. The pores can be exhausted, ensuring that the gas generated during the vulcanization process can be discharged smoothly. Compared with the traditional exhaust method, this embodiment reduces the cost of mold manufacturing and the cost of tire production, and reduces the overall production cost. When the mold needs to be cleaned and maintained, existing cleaning methods such as sandblasting, dry ice, and laser can be applied without special restrictions.

[0038] In some embodiments, the exhaust sleeve 200 includes an inserting portion 210 and a clamping portion 220 which are distributed along the axial direction thereof and connected to each other. The inserting portion 210 is used to insert the inner side of the tread embossing body and the sidewall body into the exhaust hole 101, and the clamping portion 220 is interference fit with the exhaust hole 101. During installation, the inserting portion 210 is inserted into the exhaust hole 101 from the inner side of the tread embossing body and the sidewall body, and then the clamping portion 220 is inserted into the exhaust hole 101, so that the clamping portion 220 is clamped in the exhaust hole 101. This structure makes installation easier. At the same time, the outer wall of the clamping portion 220 can be close to the exhaust hole 101, reducing the gap between the outer wall of the clamping portion 220 and the inner wall of the exhaust hole 101, so that the softened rubber will not enter between the outer wall of the clamping portion 220 and the inner wall of the exhaust hole 101, avoiding the generation of air entanglement or rubber edge.

[0039] Furthermore, along the axial direction of the exhaust sleeve 200 and in the direction away from the clamping portion 220, the outer diameter of the end of the insertion portion 210 away from the clamping portion 220 gradually decreases to form a conical structure, which facilitates the insertion of the end of the insertion portion 210 away from the clamping portion 220 into the exhaust hole 101, and as the insertion depth of the insertion portion 210 increases, the outer wall of the clamping portion 220 is gradually guided to fit tightly against the inner wall of the exhaust hole 101 to achieve an interference fit.

[0040] In some embodiments, the inserting portion 210 has a first air hole 211, the clamping portion 220 has a second air hole connected to the first air hole 211, the aperture of the second air hole is larger than the aperture of the first air hole 211, and the inner core 300 is fixed in the second air hole. In this way, the inner core 300 may not be provided in the first air hole 211, which reduces the amount of the inner core 300 and further reduces the production cost. At the same time, since the aperture of the second air hole is larger than the aperture of the first air hole 211, a step-like structure is formed at the connection between the second air hole and the first air hole 211, which can limit the movement of the inner core 300 to the first air hole 211. In a high-pressure environment, the inner core 300 can be kept in the second air hole, ensuring that no air knots or rubber edges are generated on the tire surface, and also ensuring that the gas generated during the vulcanization process can be discharged smoothly.

[0041] In some embodiments, the inner core 300 and the exhaust sleeve 200 are interference-fitted, making the installation of the inner core 300 simpler and more convenient.

[0042] In some embodiments, the inner core 300 is made of CORRAX steel or 18N i300 metal powder. The above material has sufficient hardness and its mechanical properties fully meet the pressure requirements of the mold inside the molding cavity during the tire vulcanization process. At the same time, a structure with pores can be manufactured through corresponding processes for exhaust.

[0043] In one embodiment, the inner core 300 is made of CORRAX steel by metal 3D printing. By adjusting the relevant parameters of laser melting, the inner core 300 with a density of 6.4-6.6 kg / m3 can be obtained, so that the inner core 300 has honeycomb pores.

[0044] In another embodiment, the inner core 300 is made of 18N i 300 metal powder by metal 3D printing. By adjusting relevant parameters of laser melting, the inner core 300 with a density of 6.75-6.95kg / m3 can be obtained, so that the inner core 300 has honeycomb pores.

[0045] Furthermore, the pores of the inner core 300 made in the above two embodiments may have a pore size of 0.005 mm-0.01 mm. This size range can ensure that the gas in the molding cavity can be discharged smoothly, and at the same time, the softened rubber will not penetrate into the pores.

[0046] The terms and words used in the above description and claims are not limited to the literal meanings, but are only used by the applicant to enable a clear and consistent understanding of the utility model. Therefore, it should be clear to those skilled in the art that the above description of various embodiments of the utility model is provided only for illustration, and not for limiting the utility model as defined by the attached claims and their equivalents.

Claims

1. An exhaust sleeve assembly, characterized in that: It comprises an exhaust sleeve and an inner core, wherein the inner core is fixed in the exhaust sleeve, the inner core is made of a hard material and has air-permeable pores, and the pore diameter of the pores is less than 0.03 mm; The exhaust sleeve comprises an inserting portion and a clamping portion which are distributed along the axial direction and connected to each other, the inserting portion is used to be inserted into the exhaust hole, and the clamping portion is used to be interference fit with the exhaust hole; The inserting portion has a first air hole, the clamping portion has a second air hole connected to the first air hole, the aperture of the second air hole is larger than the aperture of the first air hole, and the inner core is fixed in the second air hole; The inner core is interference-fitted with the exhaust sleeve.

2. The exhaust sleeve assembly according to claim 1, characterized in that: In a direction along the axial direction of the exhaust sleeve and away from the clamping portion, the outer diameter of one end of the inserting portion away from the clamping portion gradually decreases.

3. The exhaust sleeve assembly according to claim 1, characterized in that: The inner core is made of CORRAX steel or 18Ni300 metal powder.

4. The exhaust sleeve assembly according to claim 3, characterized in that: The inner core is made of CORRAX steel by metal 3D printing, and the density of the inner core is 6.4-6.6kg / m³; or, the inner core is made of 18Ni300 metal powder by metal 3D printing, and the density of the inner core is 6.75-6.95kg / m³.

5. The exhaust sleeve assembly according to claim 4, characterized in that: The pores have a diameter of 0.005 mm to 0.01 mm.

6. A tire mold with traceless exhaust, characterized in that: It comprises a tread embossing body, a sidewall body and a plurality of exhaust sleeve assemblies as claimed in any one of claims 1 to 5, wherein the inner sides of the tread embossing body and the sidewall body are provided with a plurality of exhaust holes penetrating to the outer sides thereof, and the exhaust sleeve is fixed in the exhaust hole.

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