Tire mold and manufacturing method thereof

Abstract

The invention belongs to the technical field of tire production, and discloses a tire mold which comprises a tread mold part which is divided into a plurality of mold sections in the circumferential direction of a tire, and each mold section comprises a plurality of blades for molding transversely extending pattern slits on the tread surface of the tire; the blade is fixedly connected to the tread mold part; a blade mounting groove and a plurality of pin holes are formed in the tread mold part, the pin holes obliquely penetrate into the tread mold part, and the end parts of the pin holes continuously penetrate into the tread mold part by a set length after penetrating through the blade mounting groove; through holes in one-to-one correspondence with the pin holes are formed in the blade; the blade is embedded into the blade mounting groove, and a plurality of pin shafts respectively penetrate through the pin holes and the through holes to limit the blade; in addition, the invention further discloses a manufacturing method of the blade mounting structure, so that the blades are limited in the blade mounting grooves by tightly matching the pin shafts with the pin holes and sequentially inserting the multiple pin shafts into the pin holes and the through holes, and the problems that a large number of defective products are produced in tire production, and cost and time are wasted are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of tire production, and specifically relates to a tire mold and a manufacturing method thereof. Background Art

[0002] Currently, various shapes of tire molds produced on the market are constantly improving according to requirements, and higher requirements are put forward for strength and performance. At present, blades and tread mold parts are often produced separately and then assembled to obtain a complete tire mold part. During the assembly process of the tire mold, the blade needs to be assembled with the tread mold part; the current assembly defects and deficiencies of the blade and the tread mold part are as follows: 1. Due to the very high material and strength of printing, it is difficult to fix the blade to the tread mold part.

[0003] 2. After the blade is fixed to the tread mold part with glue, during the tire production process, the blade may fall off.

[0004] 3. By using laser welding technology to weld the blade locally, the manufacturing difficulty in the process increases, and the blade still falls off during tire production.

[0005] 4. By adjusting the tolerance of the printed steel sheet and assembling with a tight fit, although the implanting strength can be increased, the blade still falls off continuously after repeated thermal expansion and contraction.

[0006] Once the blade falls off, a large number of defects will occur in tire production, resulting in waste of cost and time.

[0007] In addition, due to the extremely high strength of the printing material, it is difficult to improve the surface treatment after printing. Summary of the Invention

[0008] The purpose of the present invention is to provide a tire mold and a manufacturing method thereof, aiming to solve the assembly of the blade of the tire mold and the tire mold part, and after assembly, it can be stable and reliable during the production process and is not prone to falling off.

[0009] To solve the above technical problems, the purpose of the present invention is achieved as follows: A tire mold includes a tread mold part that is divided into multiple mold segments in the circumferential direction of the tire. Each mold segment includes multiple blades for molding laterally extending pattern slits on the surface of the tire tread; the blades are fixedly connected to the tread mold part; the tread mold part is provided with blade mounting grooves and multiple pin holes. The pin holes penetrate into the tread mold part obliquely, and their ends continue to penetrate into the tread mold part by a set length after passing through the blade mounting grooves; through holes corresponding to the pin holes one by one are provided on the blades; the blades are embedded in the blade mounting grooves, and multiple pin shafts respectively pass through the pin holes and the through holes to limit the blades; the pin shafts are in tight fit with the pin holes.

[0010] Based on the above solution and as a preferred solution of the above solution: The pin holes are staggered on both sides of the blade mounting groove.

[0011] Based on the above solution and as a preferred solution of the above solution: The included angle between the axis of the pin hole and the blade mounting groove is 30 - 45°.

[0012] Based on the above solution and as a preferred solution of the above solution: The included angle between the axis of the pin hole and the blade mounting groove is 45°.

[0013] Based on the above solution and as a preferred solution of the above solution: The blade is formed by 3D one - body printing.

[0014] Based on the above solution and as a preferred solution of the above solution: The upper edge of the pin shaft does not protrude above the upper edge of the pin hole.

[0015] Based on the above solution and as a preferred solution of the above solution: The outermost end of the pin shaft is welded to the upper edge of the pin hole.

[0016] In addition, a method for manufacturing a tire mold is also disclosed, which is characterized by including the following steps Preparation of the tread mold part and the blade; including machining multiple blade mounting grooves on the tread mold part according to the distribution of the blades, and obtaining the blade and the through holes on the blade through 3D printing; Machining the pin holes, machining inclined pin holes corresponding to the through holes one by one on both sides of the blade mounting groove; Assembly of the blade and the tread mold part, embedding the lower end of the blade into the blade mounting groove. At this time, the pin holes and the through holes are exactly coaxial, and the pin shafts are pressed into the pin holes.

[0017] Based on the above solution and as a preferred solution of the above solution: After the step of assembling the blade and the tread mold part, it further includes a step of welding the upper edge of the pin shaft to the upper edge of the pin hole.

[0018] On the basis of the above solution and as a preferred solution of the above solution: after the step of assembling the blade and the tread mold part, it further includes a step of flattening the upper edge of the pin shaft and the upper edge of the pin hole.

[0019] The prominent and beneficial technical effects of the present invention compared with the prior art are: by sequentially inserting a plurality of pin shafts into the pin holes and through holes, the blade is restricted in the blade installation groove. Compared with glue connection, welding assembly, and tight fit assembly, the blade can be more reliably restricted in the blade installation groove, thereby preventing the blade from falling off during use, solving the problem of a large number of defects in tire production, cost, and time waste caused thereby. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a cross-sectional view of the internal assembly structure; Figure 3 is a three-dimensional structure diagram of the blade; Figure 4 is a front view of the blade structure; Figure 5 is Figure 4 a schematic diagram of the structure at A-A in Figure 6 is Figure 4 a schematic diagram of the structure at B-B in Figure 7 is a schematic diagram of the mating state of the upper edge of the pin shaft and the surface of the tread mold part; Figure 8 is a schematic diagram of the assembly structure of the pin shaft and the tread mold part in the second embodiment.

[0021] 10. Tread mold part; 11. Blade installation groove; 12. Pin hole; 12a. Upper edge; 12b. Lower edge; 20. Blade; 21. Through hole; 30. Pin shaft; 30a. Upper edge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the given embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present application.

[0024] In the description of the present application, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Example 1

[0025] See in detail Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 7 As shown in Figure 7As shown, in order to avoid the exposure of the pin shaft 30 on the tread mold part 10, which may affect the tire forming, in this embodiment, after the pin shaft 30 is completely inserted into the lower edge 12b of the pin hole 12, the upper edge 30a of the pin shaft 30 does not protrude above the upper edge 12a of the pin hole 12. After the pin shaft 30 is installed in place, the upper edge 30a of the pin shaft 30 can be polished to make it flush with the upper edge 12a of the pin hole 12, thus solving the problem of affecting the tire forming. Of course, during the production process of the mold, the temperature will frequently rise and fall during heating and cooling, and the change of stress may cause the pin shaft and the pin hole to become loose. In order to further prevent the possible loosening problem of the pin shaft 30, in this embodiment, it is preferred that the upper edge 30a of the pin shaft is welded to the upper edge 12a of the pin hole 12. The welding method includes spot welding, and after welding, the welded part is polished to obtain a complete forming surface. Thus, the connection reliability between the blade 20 and the tread mold part 10 can be further improved.

[0026] Of course, considering the convenience of installing the pin shaft 30 and machining the pin hole 12, in this embodiment, it is preferred that the included angle between the axis of the pin hole and the blade installation groove is 30 - 45°; specifically, it is preferably 45°. The blade installation groove is machined on the tread mold part 10 by engraving the mold, and the pin hole is obtained by drilling.

[0027] The blade is formed by 3D printing. Of course, the through hole is also formed during printing, so there is no need to subsequently machine the through hole by machining methods such as drilling, or only a small amount of machining is required to obtain the through hole. For example, the through hole 21 of the printed blade 20 may have burrs or the hole diameter may not meet the preset requirements due to the shrinkage of the printing material. Only by using the drilling method to penetrate it can the burrs be removed and an appropriate hole diameter be obtained. Embodiment 2

[0028] See details in Figure 4 、 Figure 6 and Figure 8As shown in the figure, the difference between this embodiment and the first embodiment is that preferably, the pin holes 12 are staggeredly arranged on both sides of the blade installation groove. That is to say, the pin shafts 30 are inserted into the pin holes 12 staggeredly from both sides of the blade. Of course, preferably, the included angle between the axis of each pin hole and the blade installation groove is 30-45°; specifically preferably, the included angle between the axis of the pin hole and the blade installation groove is 45°. Further, after the pin shafts 30 are sequentially inserted into the pin holes 12 staggeredly arranged on both sides of the blade installation groove, compared with the connection structure of the pin shafts 30 located on the same side, this staggered pin shaft 30 installation structure can better adapt to the forces in multiple directions (including the stress changes during the heating and cooling processes of the tire mold during vulcanization), so as to more reliably limit the blade 20 in the blade installation groove 11, thereby preventing the blade from falling off during use, and solving the problems of a large number of defects in tire production, cost, and time waste caused thereby. Embodiment 3

[0029] Based on the first and second embodiments, the present application also discloses a method for manufacturing a tire mold, including the following steps: Preparation of the tread mold part and the blade; including processing a plurality of blade installation grooves 11 on the tread mold part 10 according to the blade distribution by means of mold engraving or a milling machine, and adaptively selecting the size of the blade installation grooves 11 according to the blade 20; obtaining the blade 20 and the through holes 21 on the blade by 3D printing; thus, directly processing the through holes during the printing process by the 3D printing material technology, solving the problems of extremely high strength of the 3D printed blade and difficult surface treatment and secondary processing after printing.

[0030] Processing the pin holes 12, and processing inclined pin holes 12 corresponding to the through holes 21 one by one on both sides of the blade installation groove 11 by drilling; thus preparing for the later assembly of the blade and the tread mold part by using the pin shafts 30.

[0031] Assembly of the blade 20 and the tread mold part 10, embedding the lower end of the blade 20 into the blade installation groove 11. At this time, the pin holes 12 and the through holes 21 are exactly coaxial, and the pin shafts 30 are pressed into the pin holes 12. It should be noted that when processing the pin holes, by controlling their inner diameters, the pin shafts 30 and the pin holes 12 are assembled in an interference fit manner, so that the pin shafts 30 are tightly fitted in the pin holes 12, thereby realizing reliable installation, avoiding the pin shafts 30 from coming out to a certain extent, and further realizing reliable connection between the blade 20 and the tread mold part 10, preventing the blade 20 from coming out.

[0032] Since the mold will be frequently heated and cooled during the production process, the change in stress may cause the pin shaft and the pin hole to become loose. To further prevent the possible loosening problem of the pin shaft 30, after the assembly step of the blade 20 and the tread mold part 10, it further includes a step of welding the upper edge of the pin shaft 30 and the upper edge 12a of the pin hole 12. The welding method includes spot welding. Thus, the connection reliability between the blade 20 and the tread mold part 10 can be further improved.

[0033] Of course, after welding, the connection between the pin shaft 30 and the pin hole 12 will be relatively rough and difficult to meet the production requirements of high-quality tires. For this reason, after the assembly step of the blade and the tread mold part, it further includes a step of flattening the upper edge of the pin shaft and the upper edge of the pin hole; that is to say, after welding, the welded part is polished to obtain a complete formed surface, which helps to improve the tire quality.

[0034] The above embodiments are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A tire mold, comprising a tread mold part that is divided into a plurality of mold segments in the circumferential direction of the tire, each mold segment including a plurality of blades for molding laterally extending pattern slits on the surface of the tire tread; characterized in that: The blade is fixedly connected to the tread mold part; a blade installation groove and a plurality of pin holes are formed in the tread mold part, the pin holes obliquely penetrate into the tread mold part, and the end part thereof continues to penetrate into the tread mold part by a set length after passing through the blade installation groove; through holes corresponding to the pin holes one by one are formed in the blade; the blade is embedded in the blade installation groove, and a plurality of pin shafts respectively pass through the pin holes and the through holes to limit the blade; the pin shafts are in tight fit with the pin holes.

2. A tire mold according to claim 1, characterized in that: The pin holes are arranged staggeredly on both sides of the blade installation groove.

3. A tire mold according to claim 1, characterized in that: The included angle between the axis of the pin hole and the blade installation groove is 30 - 45°.

4. A tire mold according to claim 1, characterized in that: The included angle between the axis of the pin hole and the blade installation groove is 45°.

5. A tire mold according to claim 1, characterized in that: The blade is integrally formed by 3D printing.

6. A tire mold according to claim 1, characterized in that: The upper edge of the pin shaft does not protrude above the upper edge of the pin hole.

7. A tire mold according to claim 6, characterized in that: The outermost end of the pin shaft is welded to the upper edge of the pin hole.

8. A manufacturing method of a tire mold according to any one of claims 1-7, characterized in that: Comprising the following steps: Preparation of the tread mold part and the blade; Including machining a plurality of blade installation grooves on the tread mold part according to the blade distribution, and obtaining the blade and the through holes on the blade by 3D printing; Machining the pin holes, and machining inclined pin holes corresponding to the through holes one by one on both sides of the blade installation groove; Assembly of the blade and the tread mold part, embedding the lower end of the blade into the blade installation groove, at this time the pin holes and the through holes are exactly coaxially arranged, and pressing the pin shaft into the pin hole.

9. The manufacturing method according to claim 8, characterized in that: After the step of assembling the blade and the tread mold part, it further includes the step of welding the upper edge of the pin shaft to the upper edge of the pin hole.

10. The manufacturing method according to claim 9, characterized in that: After the step of assembling the blade and the tread mold part, it further includes the step of flattening the upper edge of the pin shaft and the upper edge of the pin hole.

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