Manufacturing method of tire section mold

Abstract

The invention discloses a manufacturing method of a tire section mold. The manufacturing method comprises the following steps: designing tire patterns; a pattern piece assembly is machined in a 3D printing mode; assembling the pattern piece assembly and the silica gel mold; manufacturing a plaster mold; removing the mold; determining the nature of the plaster mold and drying; closing the plaster mold, and pouring into a mold cavity of the plaster mold; after cooling, the plaster mold is removed, and a blade mounting groove is formed in the metal mold; the tire pattern blade is embedded and fixed in the blade mounting groove; compared with a split type structure, the pattern piece assembly of the integral structure has the advantages that the surface welding procedure of the matching surface of the combination part in the subsequent procedure can be omitted, and the subsequent welding procedure and the subsequent polishing procedure can be reduced or omitted to a great extent; displacement caused by deformation of an adjacent part assembly structure due to temperature change in the casting production process of part assembly is also avoided; in addition, corresponding procedures are reduced, so that the manufacturing period can be shortened to a great extent.

Description

Technical Field

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

[0002] Currently, various shapes of tire molds produced on the market are continuously improved according to requirements, and higher requirements are put forward for strength and performance. Currently, commonly used steel sheet materials such as stainless steel with good performance are produced by stamping, but they can no longer meet the needs. The market requires materials with higher performance and strength. The emergence and rapid popularization of 3D printing technology have provided a broader space for material selection and brought infinite possibilities.

[0003] With the gradual increase of the printing range in the market, general ordinary steel sheets can be used after one printing. For some complex structures, due to their large volume and coverage area, one printing cannot currently complete them, and the market uses a split method for production.

[0004] Following the development of adjustments, with the continuous improvement of the surface requirements and quality of the mold, although the split type is not difficult to manufacture, manual labor and working hours are required for subsequent gap and surface treatment, which cannot meet the market's requirements for the delivery date and quality of the mold. The main problems are as follows: 1. The split structure will make the entire structure more complex and the process more cumbersome. 2. For the split shape, the number of shapes to be produced is large, the workload will increase accordingly, and the error rate will also increase. 3. For split production, since it is a combination of multiple shapes, the difficulty coefficient in the actual assembly process is increased. 4. After split production, during the implantation in the subsequent process, defects such as step differences and improper fitting will occur. 5. After the tire mold is manufactured, laser treatment needs to be carried out on the joint part, increasing the input of production time. 6. At the root of the mold, due to fitting, gaps occur. This position is close to the lower surface of the mold, and the processing space is small, which brings inconvenience to the implementation of electric welding and grinding work, resulting in a decline in surface quality. 7. After split production, due to surface treatment, the surface uniformity of the mold decreases and the quality cannot be guaranteed. 8. For split production, due to the large amount of manual labor and working hours invested in the later stage, the delivery date and quality cannot meet the market demand. Summary of the Invention

[0005] The purpose of the present invention is to provide a manufacturing method for a tire segment mold, which aims to...

[0006] To solve the above technical problems, the purpose of the present invention is achieved as follows: A manufacturing method for a tire segment mold includes the following steps: S1: Design of tire treads; S2: Production of the silicone mold and the pattern piece assembly; including processing the pattern piece assembly by 3D printing; S3: Assembly of the pattern piece assembly and the silicone mold; S4: Fabrication of the gypsum mold; including pouring a gypsum mixture after closing the mold of the silicone mold assembled with the pattern piece assembly; S5: Demolding; including demolding the silicone mold and removing the gypsum mold. At this time, the gypsum mold partially wraps the pattern piece assembly, and only a part of the pattern piece assembly is exposed outside the gypsum mold; S6: Qualifying and drying the gypsum mold; S7: Closing the gypsum mold and pouring into its cavity; S8: Removing the gypsum mold after cooling and shaping the obtained metal mold; the part of the pattern piece assembly exposed outside the gypsum mold forms a blade installation groove on the metal mold; S9: Inserting and fixing the tire tread blade into the blade installation groove; S10: Obtaining the tire segment mold.

[0007] Based on the above solution and as a preferred solution of the above solution: Step S2 further includes a step of heat-treating the pattern piece assembly after 3D printing and forming.

[0008] Based on the above solution and as a preferred solution of the above solution: Heat-treating the pattern piece assembly after 3D printing and forming in step S2 includes heating the pattern piece assembly to 480 - 500 °C for 1 - 1.2 h; and after maintaining the temperature at 480 - 500 °C for 5 - 7 h, naturally cooling to room temperature with the furnace.

[0009] Based on the above solution and as a preferred solution of the above solution: The pattern piece assembly is integrally formed by 3D printing; the pattern piece assembly includes a skeleton, a continuous, sheet-like pattern piece main body with a set thickness extending upward from the outer peripheral surface of the skeleton, and a plurality of sheet-like blades with a set thickness extending from the pattern piece main body to both sides. The cross-sectional width of the skeleton is greater than the cross-sectional width of the pattern piece main body.

[0010] Based on the above solution and as a preferred solution of the above solution: The cross-sectional width of the skeleton is greater than the cross-sectional width of the pattern piece main body.

[0011] Based on the above solution and as a preferred solution of the above solution: A plurality of first protrusions are provided on both side surfaces of the pattern piece main body, and the first protrusions are distributed on the side surface of the pattern piece main body adjacent to the skeleton.

[0012] Based on the above solution and as a preferred solution to the above solution: A plurality of second protrusions are provided on both sides of the blade, and the second protrusions are distributed on the side of the blade adjacent to the skeleton.

[0013] Based on the above solution and as a preferred solution to the above solution: The skeletons and the main body of the pattern piece are both in a zigzag shape.

[0014] Based on the above solution and as a preferred solution to the above solution: A plurality of positioning grooves and a plurality of positioning bumps are preset on the silicone mold, and a slot is provided on the side of the positioning bump; the main body of the pattern piece is embedded in the positioning groove, and the outermost end of the blade is embedded in the slot.

[0015] The prominent and beneficial technical effects of the present invention compared with the prior art are as follows: It is an integrated structure by 3D printing. Compared with the split structure, the surface welding process for the mating surface of the joint part in the subsequent process can be omitted, which can greatly reduce or omit the subsequent welding process and grinding process; it also avoids the problem of the assembly of multiple original parts, and reduces the displacement caused by the deformation of the assembly structure of adjacent parts due to temperature change during the casting production process; in addition, the reduction of corresponding processes can greatly shorten the production cycle. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the pattern piece assembly; Figure 2 It is a schematic diagram of the overall structure of the protrusions on the pattern piece assembly; Figure 3 It is a schematic diagram of the assembly structure of the pattern piece assembly and the silicone mold. Detailed Description of the Embodiments

[0017] 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 shall fall within the protection scope of the present application.

[0018] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and 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.

[0019] In the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0020] See Figures 1-3 As shown, the present application discloses a method for manufacturing a tire segment mold, comprising the following steps: S1: Design of tire tread: Using 3D modeling, design the tire tread according to the tire performance requirements or customer customization needs, and then design the plaster mold model and the 3D model of the tread piece assembly according to the structure and texture of the tire tread.

[0021] S2: Production of silicone mold and pattern sheet assembly 10; including processing the pattern sheet assembly 10 by 3D printing. Specifically, the pattern sheet assembly 10 is formed in one piece by 3D printing; the pattern sheet assembly 10 includes a skeleton 11, a continuous, sheet-shaped pattern sheet body 12 with a set thickness extending upward from the outer circumference of the skeleton 11, and a plurality of sheet-shaped blades 13 with a set thickness extending from the pattern sheet body 12 to both sides; the pattern sheet assembly 10 and the base 20 are formed in one piece by casting, and only the pattern sheet body 12 and the blades 13 are exposed to a set height at the end away from the skeleton 11. Specifically, in this embodiment, a model is built according to the required structure of the pattern sheet assembly 10, and the built model is imported into the slicing system of the 3D printer to generate a 3D printing file, and then the metal powder is printed and formed by a metal 3D printer, and then the support position required in the printing process is removed, and the surface is trimmed to obtain the pattern sheet assembly 10. Of course, the prototype of the plaster mold can also be printed out by 3D printing technology. Of course, the prototype of the plaster mold needs to be modified and adjusted according to the structure required for the assembly of the pattern sheet component and the formed silicone mold, and then the silicone mold is made using silicone according to the modified and adjusted plaster mold. Among them, step S2 also includes the step of heat treating the pattern sheet component 10 after 3D printing. The heat treatment of the pattern sheet component 10 after 3D printing specifically includes: heating the pattern sheet component 10 to 480-500℃ for 1-1.2H; and after keeping it at 480-500℃ for 5-7H, it is naturally cooled to room temperature with the furnace.

[0022] S3: Assembling the pattern sheet assembly 10 with the silicone mold; the specific process includes the steps of positioning the printed pattern sheet assembly 10 on the silicone mold of the mold. It should be noted that, see Figure 3As shown in the figure, a positioning groove 23 for the pattern piece assembly 10 is preset on the silicone mold, and a slot is provided on the side of the positioning bump 21 provided on the silicone mold. With the skeleton 11 of the pattern piece assembly 10 facing upwards, the pattern piece body 12 and / or the blade 13 part are tightly inserted into the positioning groove 23 and the slot of the silicone mold. The pattern piece body 12 and / or the blade 13 are in a tight fit with the positioning groove 23 and the slot. By utilizing the elasticity of the silicone and the elastic edge of the positioning groove, the pattern piece assembly 10 can be clamped and positioned. After positioning, the part of the skeleton 11, the pattern piece body 12 near the skeleton 11, and the blade 13 near the skeleton 11 are exposed outside the silicone film. In addition, raised first patterns 24 and raised second patterns 22 are also arranged on the silicone mold.

[0023] S4: Fabrication of the gypsum mold; including pouring a gypsum mixture after closing the silicone mold assembled with the pattern piece assembly 10; specifically including closing the silicone mold and pouring gypsum liquid into its mold cavity, and waiting for the gypsum liquid to solidify.

[0024] S5: Demolding; including removing the silicone mold to obtain the gypsum mold. At this time, the part of the skeleton 11, the pattern piece body 12 near the skeleton 11, and the blade 13 near the skeleton 11 will be located inside the gypsum mold, and the part of the pattern piece body 12 and / or the blade 13 that was originally inserted into the silicone mold will be exposed outside the gypsum mold. Shape the gypsum mold, including trimming burrs, etc., thereby obtaining a qualified gypsum mold.

[0025] S6: Qualifying and drying the gypsum mold; S7: Closing the gypsum mold and pouring into its mold cavity; Assembling the gypsum mold to obtain a formed mold cavity. After heating and insulating the gypsum mold to the set temperature, pour molten aluminum liquid into the formed mold cavity.

[0026] S8: After cooling, remove the gypsum mold and shape the obtained metal mold; Specifically, after pouring and waiting for cooling and forming, remove the external gypsum mold, and a semi-finished product of the tire segment mold can be obtained. And on the semi-finished product of the tire segment mold, a concave card slot is formed by the pattern piece body 12 and / or the blade 13 exposed outside the gypsum mold. The part of the pattern piece assembly 10 exposed outside the gypsum mold forms a blade installation slot on the metal mold.

[0027] S9: Embedding and fixing the tire tread pattern blades in the blade installation slots; Embedding and fixedly installing multiple blades used to form the transverse extending pattern slits on the surface of the tire tread in the card slots, thereby forming a finished product of the tire segment mold.

[0028] S10: Obtain the tire segment mold. By polishing, grinding, and trimming the metal mold equipped with blades, obtain the tire segment mold.

[0029] In addition, considering that in order to improve the connection strength and reliability between the entire pattern piece assembly 10 and the gypsum mold, in this embodiment, it is preferred that the cross-sectional width of the skeleton 11 is greater than the cross-sectional width of the pattern piece main body 12. Thus, the pattern piece assembly 10 can form a pre-embedded part structure in the gypsum mold, which can significantly improve the connection strength of the pattern piece assembly 10 in the gypsum mold and prevent the risk that the pattern piece assembly 10 moves or detaches from the gypsum mold due to external force during the demolding process.

[0030] In addition, in order to further improve the connection strength and reliability between the entire pattern piece assembly 10 and the gypsum mold, in this embodiment, it is further preferred that a plurality of first protrusions 121 are provided on both side surfaces of the pattern piece main body 12, and the first protrusions 121 are distributed on the side surface of the pattern piece main body 12 adjacent to the skeleton 11. Of course, a plurality of second protrusions 131 can also be provided on both side surfaces of the blade 13, and the second protrusions are distributed on the side surface of the blade 13 adjacent to the skeleton 11. It is preferred that the first protrusions 121 and the second protrusions 131 are parallel to the extension direction of the skeleton 11; thereby further improving the bonding strength with the gypsum mold through the first protrusions 121 and the second protrusions 131, and further preventing the risk that the pattern piece assembly 10 moves or detaches from the gypsum mold due to external force during the demolding process. According to the trend of the pattern slits extending horizontally on the tire tread surface, it is preferred that the trends of both the skeleton 11 and the pattern piece main body 12 are zigzag.

[0031] 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 manufacturing method of a tire segment mold, characterized in that: It includes the following steps: S1: Design of tire tread; S2: Production of silicone mold and tread piece assembly (10); including processing the tread piece assembly (10) by 3D printing; S3: Assembly of the tread piece assembly (10) and the silicone mold; S4: Fabrication of a plaster mold; including pouring a plaster mixture after closing the silicone mold assembled with the tread piece assembly (10); S5: Demolding; including demolding the silicone mold and removing the plaster mold. At this time, the plaster mold partially wraps the tread piece assembly (10), and only a part of the tread piece assembly (10) is exposed outside the plaster mold; S6: Qualifying and drying the plaster mold; S7: Closing the plaster mold and pouring into its cavity; S8: After cooling, removing the plaster mold and shaping the obtained metal mold; the part of the tread piece assembly (10) exposed outside the plaster mold forms a blade mounting groove on the metal mold; S9: Inserting and fixing the tire tread blade into the blade mounting groove; S10: Obtaining a tire segment mold.

2. The manufacturing method of a tire section mold according to claim 1, characterized in that: Step S2 further includes a step of heat-treating the tread piece assembly (10) after 3D printing and forming.

3. The manufacturing method of a tire segment mold according to claim 2, characterized in that: In step S2, heat-treating the tread piece assembly (10) after 3D printing and forming includes heating the tread piece assembly (10) to 480 - 500 °C for 1 - 1.2 h; and after holding at 480 - 500 °C for 5 - 7 h, naturally cooling to room temperature with the furnace.

4. A manufacturing method of a tire segment mold according to claim 1, characterized in that: The tread piece assembly (10) is integrally formed by 3D printing; the tread piece assembly (10) includes a skeleton (11), a continuous, sheet-like tread piece body (12) with a set thickness extending upward from the outer peripheral surface of the skeleton (11), and a plurality of sheet-like blades (13) with a set thickness extending from both sides of the tread piece body (12). The cross-sectional width of the skeleton (11) is greater than the cross-sectional width of the tread piece body (12).

5. The manufacturing method of a tire segment mold according to claim 4, characterized in that: The cross-sectional width of the skeleton (11) is greater than the cross-sectional width of the tread piece body (12).

6. The manufacturing method of a tire segment mold according to claim 4, characterized in that: A plurality of first protrusions (121) are provided on both sides of the tread piece body (12), and the first protrusions (121) are distributed on the side of the tread piece body (12) adjacent to the skeleton (11).

7. A manufacturing method of a tire segment mold according to claim 6, characterized in that: A plurality of second protrusions (131) are provided on both sides of the blade (13), and the second protrusions are distributed on the side of the blade (13) adjacent to the skeleton (11).

8. A manufacturing method of a tire segment mold according to claim 4, characterized in that: The directions of both the skeleton (11) and the tread piece body (12) are zigzag.

9. A manufacturing method of a tire segment mold according to claim 4, characterized in that: A plurality of positioning grooves (23) and a plurality of positioning bumps (21) are preset on the silicone mold. A slot is provided on the side surface of the positioning bump (21); the tread piece body (12) is inserted into the positioning groove (23), and the outermost ends of the blades (13) are inserted into the slots.

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