A split face glueless edge tire mold

Abstract

The utility model relates to tire mould technical field discloses a parting surface no rubber edge tire mould, including upper die, lower die and the middle die of clamping between both, the middle die inboard is equipped with the cavity for the pattern of all steel tire pattern, the upper die and the lamination surface of middle die form upper parting surface, the lamination surface of lower die and middle die form lower parting surface, and the edge of upper parting surface, lower parting surface all has sharp corner structure integrally, the sharp corner structure inboard of upper parting surface is equipped with upper overflow ring groove. In the utility model, the U-shaped ring groove is designed in the sharp corner inboard of the parting surface of upper die and lower die and middle die, the structure design can actively undertake the high pressure extrusion of the side rubber in the mold closing process, avoids the overflow of the rubber to the tire surface solidification into hard rubber edge, completely saves the high strength pruning process, reduces total production cost, prevents the pruning injury steel wire cord protection layer simultaneously, improves all steel tire fatigue resistance.

Description

Technical Field

[0001] This utility model relates to the field of tire mold technology, and in particular to a tire mold with no glue edge on the parting surface. Background Technology

[0002] Because all-steel tires contain multiple layers of steel cord in their carcass, they require higher molding pressure (typically 18-22 MPa) and longer holding time during vulcanization. The sharp corners of the parting surface of their specialized molds must withstand greater extrusion pressure from the rubber compound. Currently, the sharp corners of the parting surface of most all-steel tire molds are metal-flat bonding structures. Under high pressure, the rubber compound on the tire sidewall is easily extruded from the gaps in the sharp corners, forming a hard, strongly adhesive rubber edge after curing. Since the rubber edge of all-steel tires contains steel wire impurities, subsequent trimming requires specialized high-strength tools, which not only increases process costs and labor input but also easily scratches the protective layer of the steel cord on the tire sidewall, leading to a decrease in the tire's fatigue resistance.

[0003] Therefore, those skilled in the art have provided a tire mold with a non-adhesive edge on the parting surface to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide a tire mold with a non-rubber-edge parting surface. This technical solution designs a U-shaped annular groove on the inner side of the sharp corner of the parting surface of the upper and lower molds and the middle mold. This structural design can actively receive the sidewall rubber material extruded under high pressure during the mold closing process, preventing the rubber material from overflowing onto the tire surface and solidifying into a hard rubber edge. This completely eliminates the need for high-intensity trimming, reduces the total production cost, and at the same time prevents trimming from damaging the steel cord protective layer, thus improving the fatigue resistance of all-steel tires.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A tire mold with a non-adhesive parting surface includes an upper mold, a lower mold, and a middle mold sandwiched between the two. The middle mold has a cavity on its inner side for forming the tread pattern of an all-steel tire. The mating surfaces of the upper mold and the middle mold form an upper parting surface, and the mating surfaces of the lower mold and the middle mold form a lower parting surface. The edges of both the upper and lower parting surfaces are integrally formed with sharp corner structures. The inner side of the sharp corner structure of the upper parting surface has an upper overflow annular groove, which is opened on the lower end face of the upper mold and forms a closed ring around the edge of the upper mold cavity. The inner side of the sharp corner structure of the lower parting surface has a lower overflow annular groove, which is opened on the upper end face of the lower mold and forms a closed ring around the edge of the lower mold cavity. Through the above technical solution, a U-shaped ring groove is designed on the inner side of the sharp corner of the parting surface of the upper mold, lower mold and middle mold. This structural design can actively receive the sidewall rubber material extruded under high pressure during the mold closing process, preventing the rubber material from overflowing to the tire surface and solidifying into a hard rubber edge. This completely eliminates the need for high-intensity trimming, reduces the total production cost, and at the same time prevents trimming from damaging the steel cord protective layer, thus improving the fatigue resistance of all-steel tires.

[0006] Furthermore, the inner walls of the upper overflow annular groove and the lower overflow annular groove are both treated with gas nitriding to form a nitrided layer, which is used to reduce the adhesion of the adhesive and erosion wear. Through the above technical solution, a nitrided layer is formed on the inner wall of both the upper and lower overflow annular grooves by gas nitriding treatment. The nitrided layer has high hardness and strong wear resistance, which can prevent the high-pressure overflow from eroding and wearing the annular grooves.

[0007] Furthermore, the upper mold, lower mold, and middle mold are all made of H13 hot work die steel and have undergone quenching and tempering treatment; Through the above technical solution, the upper mold, lower mold and middle mold are all made of H13 hot work die steel and are subjected to quenching and tempering treatment, which can improve the service life of the upper mold, lower mold and middle mold.

[0008] Furthermore, both the upper overflow annular groove and the lower overflow annular groove have U-shaped cross sections, and their groove width and groove depth are the same. With the above technical solution, the cross-sections of the upper overflow ring groove and the lower overflow ring groove are both U-shaped, and the width and depth of the grooves are the same. The U-shaped structure has strong stability and can better cope with the extrusion of overflow material.

[0009] This utility model has the following beneficial effects: 1. This utility model proposes a tire mold with a parting surface without rubber edge. The technical solution designs a U-shaped annular groove on the inner side of the sharp corner of the parting surface of the upper mold, lower mold and middle mold. This structural design can actively receive the tire sidewall rubber material extruded under high pressure during the mold closing process, preventing the rubber material from overflowing to the tire surface and solidifying into a hard rubber edge. This completely eliminates the need for high-intensity trimming, reduces the total production cost, and at the same time prevents trimming from damaging the steel cord protective layer, improving the fatigue resistance of the all-steel tire. The nitrided layer on the inner wall of the annular groove has high hardness and strong wear resistance, which can prevent the high-pressure overflow material from eroding and wearing the annular groove. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of a tire mold with a non-adhesive edge on the parting surface proposed in this utility model; Figure 2 This is an isometric view of a tire mold with a parting surface without glue edge proposed in this utility model; Figure 3 This utility model proposes a tire mold with a parting surface without glue edges. Figure 1 Enlarged view of point A in the middle; Figure 4 This utility model proposes a tire mold with a parting surface without glue edges. Figure 1 Enlarged view of point B in the middle.

[0011] Explanation of reference numerals in the attached figures: 1. Upper mold; 2. Lower mold; 3. Middle mold; 4. Cavity; 5. Upper parting surface; 6. Lower parting surface; 7. Sharp corner structure; 8. Upper overflow ring groove; 9. Lower overflow ring groove; 10. Nitriding layer. Detailed Implementation

[0012] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Reference Figure 1-4 This utility model provides a specific implementation method: A tire mold with a non-adhesive edge on the parting surface includes an upper mold 1, a lower mold 2, and a middle mold 3 sandwiched between the two. The inner side of the middle mold 3 has a cavity 4 for forming the tread pattern of an all-steel tire. The mating surfaces of the upper mold 1 and the middle mold 3 form an upper parting surface 5, and the mating surfaces of the lower mold 2 and the middle mold 3 form a lower parting surface 6. The edges of both the upper parting surface 5 and the lower parting surface 6 are integrally formed with sharp corner structures 7. The inner side of the sharp corner structure 7 of the upper parting surface 5 has an upper overflow annular groove 8, which is opened on the lower end face of the upper mold 1 and forms a closed ring around the edge of the cavity of the upper mold 1. The lower parting surface 6 has a sharp corner structure 7 with an overflow groove 9 on the inner side. The overflow groove 9 is opened on the upper end face of the lower mold 2 and forms a closed ring around the edge of the cavity of the lower mold 2. U-shaped ring grooves are designed on the inner side of the sharp corner of the parting surface of the upper mold 1, lower mold 2 and middle mold 3. This structural design can actively receive the sidewall rubber material extruded under high pressure during the mold closing process, preventing the rubber material from overflowing to the tire surface and solidifying into a hard rubber edge. This completely eliminates the need for high-intensity trimming, reduces production costs, and at the same time prevents trimming from damaging the steel cord protective layer, improving the fatigue resistance of the all-steel tire.

[0014] The inner walls of the upper overflow annular groove 8 and the lower overflow annular groove 9 are both treated with gas nitriding to form a nitrided layer 10, which is used to reduce the adhesion and erosion wear of the adhesive material. The nitrided layer 10 has high hardness and strong wear resistance, which can prevent the high-pressure overflow from eroding and wearing the annular grooves. The upper mold 1, lower mold 2, and middle mold 3 are all made of H13 hot work die steel and have undergone quenching and tempering treatment. The upper mold 1... The lower die 2 and the middle die 3 are both made of H13 hot work die steel and have been quenched and tempered, which can improve the service life of the upper die 1, the lower die 2 and the middle die 3. The cross-section of the upper overflow ring groove 8 and the lower overflow ring groove 9 are both U-shaped, and the width and depth of the grooves are the same. The U-shaped structure has strong stability and can better cope with the extrusion of overflow material.

[0015] Working principle: When in use, the all-steel tire blank is placed into the cavity 4 of the middle mold 3. After the mold is closed, the upper mold 1, middle mold 3 and lower mold 2 are fixed by the mold locking mechanism. Then the vulcanization operation is carried out. During the vulcanization process, a small amount of tire sidewall rubber is squeezed out under high pressure and flows into the upper overflow ring groove 8 and lower overflow ring groove 9 along the sharp corner structure 7. After the vulcanization is completed, the mold is opened and the overflow in the ring groove naturally separates with the mold parting. The formed all-steel tire has no rubber edge and does not require subsequent trimming.

[0016] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in a general design.

[0017] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0018] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tire mold with a parting surface without adhesive edge, comprising an upper mold (1), a lower mold (2), and a middle mold (3) sandwiched between the two, characterized in that: The inner side of the middle mold (3) is provided with a cavity (4) for forming the pattern of all-steel tires. The mating surface of the upper mold (1) and the middle mold (3) forms an upper parting surface (5). The mating surface of the lower mold (2) and the middle mold (3) forms a lower parting surface (6). The edges of the upper parting surface (5) and the lower parting surface (6) are integrally formed with a sharp corner structure (7). The sharp corner structure (7) of the upper parting surface (5) is provided with an upper overflow ring groove (8). The upper overflow ring groove (8) is opened on the lower end face of the upper mold (1) and forms a closed ring around the edge of the cavity of the upper mold (1). The sharp corner structure (7) of the lower parting surface (6) is provided with a lower overflow ring groove (9). The lower overflow ring groove (9) is opened on the upper end face of the lower mold (2) and forms a closed ring around the edge of the cavity of the lower mold (2).

2. The tire mold with a non-adhesive edge on the parting surface according to claim 1, characterized in that: The inner walls of the upper overflow ring groove (8) and the lower overflow ring groove (9) are both treated with gas nitriding to form a nitrided layer (10) to reduce the adhesion and erosion wear of the adhesive.

3. The tire mold with a non-adhesive edge on the parting surface according to claim 1, characterized in that: The upper mold (1), lower mold (2) and middle mold (3) are all made of H13 hot work die steel and have been quenched and tempered.

4. A tire mold with a non-adhesive edge on the parting surface according to claim 1, characterized in that: The cross-sections of the upper overflow ring groove (8) and the lower overflow ring groove (9) are both U-shaped, and their groove width and groove depth are the same.

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