A double ring closed flash mold and method for solid tire vulcanization process
Patent Information
- Application Number
- CN202611056351.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-16
- Publication Date
- 2026-09-25
AI Technical Summary
[0007]本发明旨在提供一种用于实心轮胎硫化工艺双环封闭溢胶模具及方法，降低胶料浪费率，解决目前采用单环开放式溢胶槽导致成品质量下降，生产成本高、生产效率低，轮胎质量合格率低，定期清理溢胶费时费力的问题
[0022]（1）相比于采用单环开放式溢胶槽，需要先保证多余胶料能填满单环溢胶槽，但由于采用开放式溢胶槽，多余胶料会溢出，因此多余胶料需要远大于填满单环溢胶槽的量，而本方案采用双环封闭溢胶槽，溢胶环槽一和溢胶环槽二同心设置，同时溢胶环槽一与轮胎型腔接通，多余胶料开始进入溢胶环槽一，而溢胶环槽一与溢胶环槽二连通，因此多余胶料通过环向连接通道再进入溢胶环槽二中，并由于双环设计有效减缓胶料流动性，提供胶料缓冲空间，使胶料能产生回流，同时多余胶料还能顺着溢胶环槽一通过外导流槽进行分流导流，实现胶料均匀分流、有序排出，减少溢胶损耗，提高产品合格率与外观质量。
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Figure CN122808104A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of solid tire vulcanization technology, specifically to a double-ring closed overflow mold and method for solid tire vulcanization process. Background Technology
[0002] Excess rubber is generated during the vulcanization process of solid tires. The method of overflow discharge directly affects the molding quality, material loss, and trimming costs. Existing molds generally use a single-ring open overflow channel, which has the following drawbacks:
[0003] 1) The lack of buffer in the flow of rubber material can easily lead to defects such as overflow accumulation, excessively thick flash, insufficient rubber in tires, and cracks in the mold seam, resulting in a decline in the quality of finished products. At the same time, when excessively thick flash or uneven residue occurs, additional processing such as secondary trimming is required, which increases processing costs and reduces production efficiency.
[0004] 2) Because the overflow tank is an open design, too much rubber overflows into the overflow tank during the vulcanization process, which often leads to waste of rubber and increases production costs. The cost of rubber is 10 yuan / catties, and the raw material cost is not low. Taking the 300-15 (OB502) tire as an example, the overflow consumption of traditional process is as high as 17.6 kg / T, and the first pass rate is only 76.54%. The production cost is high and the production efficiency is low. When facing large-scale production, it has a great impact on cost control.
[0005] 3) An improperly designed overflow groove may lead to inaccurate control of rubber distribution during vulcanization, resulting in poor stability and consistency of product dimensions. Solid tires have high requirements for dimensional accuracy, and uneven overflow may cause weight deviation or irregular shape of the tire, further affecting its performance.
[0006] 4) The overflow groove design makes it easy for the overflowing rubber to accumulate and adhere to the mold after vulcanization, requiring regular cleaning, which is time-consuming and labor-intensive. The overflowing rubber can also easily flow out and contaminate the hot plate of the vulcanizing machine, making cleaning difficult and labor-intensive, increasing the difficulty and time of production line maintenance, and leading to a decrease in production efficiency. Summary of the Invention
[0007] This invention aims to provide a double-ring closed overflow mold and method for solid tire vulcanization process, reducing rubber waste rate and solving the problems of reduced finished product quality, high production cost, low production efficiency, low tire quality pass rate, and time-consuming and labor-intensive periodic cleaning of overflow caused by the current use of single-ring open overflow tank.
[0008] Therefore, the technical solution adopted by the present invention is as follows: a double-ring closed overflow mold for solid tire vulcanization process, including an upper mold and a lower mold. The upper mold and the lower mold are assembled to form a tire cavity for placing the tire blank. When the upper mold and the lower mold are closed, the outer parting surfaces are assembled to form concentric overflow ring groove one and overflow ring groove two. The overflow ring groove one is close to the tire cavity and is connected to the tire cavity. A circumferential connecting channel is provided between the overflow ring groove one and overflow ring groove two of the lower mold, thereby jointly providing a buffer space for excess rubber. The overflow ring groove one of the lower mold is evenly distributed with radially extending outer guide grooves around its circumference. The outer end of the outer guide groove extends through the overflow ring groove two to the outer side wall of the lower mold, thereby guiding the excess rubber to flow evenly. The outer port of the outer guide groove is provided with a sealing structure to intercept the rubber.
[0009] As a preferred embodiment of the above scheme, when the tire prepared by the tire cavity is 8-10 inches, the inner diameter of overflow groove one and overflow groove two is 6mm-8mm; when the tire prepared by the tire cavity is 12-15 inches, the inner diameter of overflow groove one and overflow groove two is 8mm-10mm; when the tire prepared by the tire cavity is 15 inches, the inner diameter of overflow groove one and overflow groove two is 10mm-12mm; when the tire prepared by the tire cavity is 20 inches, the inner diameter of overflow groove one and overflow groove two is 6mm-8mm; when the tire prepared by the tire cavity is 12-15 inches, the inner diameter of overflow groove one and overflow groove two is 8mm-10mm; when the tire prepared by the tire cavity is 15 inches, the inner diameter of overflow groove one and overflow groove two is 10mm-12mm; when the tire prepared by the tire cavity is 20 inches, the inner diameter of overflow groove one and overflow groove two is 6mm-8mm. The inner diameter of the rubber ring groove 2 is 12mm to 14mm. Different inner diameters of the overflow rubber ring groove 1 and overflow rubber ring groove 2 are selected according to the tire specifications. Compared with the conventional single-ring overflow rubber groove with a uniform inner diameter of 14mm, because the overflow rubber material will fill the overflow rubber groove first during the vulcanization process, it is necessary to leave enough rubber material to fill the overflow rubber groove. Therefore, the larger the inner diameter of the overflow rubber groove, the more surplus material is required and the greater the amount of rubber material wasted. Selecting different sizes of overflow rubber grooves according to the tire size specifications can effectively reduce the amount of rubber material wasted, and the size design is reasonable.
[0010] A further preferred embodiment is that the mold closing gap between the upper mold and the lower mold is 0.6mm to 1mm, which is a reasonable size design. Compared with the previous gap of 6mm, which resulted in a groove on the circumferential surface of the prepared tire and an unsightly appearance, the current gap of 0.6mm to 1mm reduces the width of the groove on the outer circumference of the tire and significantly improves the tire's aesthetics.
[0011] A further preferred embodiment is that the upper mold and lower mold are provided with grid-shaped circumferentially penetrating exhaust grooves on the inner side of the tire cavity. The exhaust grooves are used to discharge the gas generated during the vulcanization process. The exhaust ridges generated by the exhaust grooves in the prepared tire are used for exhaust and heat dissipation during tire use. The structure design is reasonable.
[0012] Further preferably, the upper and lower molds are provided with vent holes at circumferential intervals on the outer corners of the tires prepared accordingly, so as to ensure that the gas generated during the tire vulcanization process can be discharged, effectively improving the tire appearance qualification rate; the sealing structure adopts the outer wall of the lower mold itself or the welded sealing plate corresponding to the outer port of the outer guide groove, which has a reasonable structural design and a firm sealing.
[0013] More preferably, the overflow groove is connected to the tire cavity via an annular channel. The annular channel has a cross-section that narrows in the middle and has flared openings at both ends. The opening facing the overflow groove is larger than the opening facing the tire cavity, ensuring that excess rubber can slow down along the narrow opening of the annular channel before entering the overflow groove. The annular channel acts as a buffer channel to ensure uniform distribution of overflow rubber.
[0014] A further preferred embodiment is that when the upper mold and the lower mold are closed, the inner parting surface is assembled to form a circumferential inner overflow groove. The circumferential inner overflow groove is close to the tire cavity. The circumferential inner overflow groove in the lower mold is evenly distributed with inner guide grooves that extend radially away from the tire cavity. This effectively avoids the situation where excess rubber flows inward along the gap without an overflow groove to accommodate it when the mold operation is unstable. The structural design is reasonable.
[0015] More preferably, there are 12 outer guide channels and 6 inner guide channels, with a channel depth of 3mm to 4mm and a channel width of 16mm to 17mm. The quantity and size design are reasonable. The inner guide channels involve less adhesive material, so the number of channels can be reduced.
[0016] This invention also employs a double-ring sealing method for excess rubber in the vulcanization process of solid tires, comprising the following steps:
[0017] Step S1: Use any of the above-mentioned double-ring closed overflow molds for solid tire vulcanization process to preheat the tire blank, and set the vulcanization temperature, vulcanization pressure and vulcanization time.
[0018] Step S2: During the vulcanization process, excess rubber gradually flows outward and is stored through overflow ring groove 1, overflow ring groove 2, and external guide groove. At the same time, the rubber backflow is prevented from overflowing due to the sealing of the outer end of the external guide groove.
[0019] Step S3: After vulcanization, open the mold, remove the prepared tire, and clean up any excess rubber.
[0020] As a preferred embodiment of the above scheme, in step S1, the vulcanization temperature is set to 145±3℃, the vulcanization pressure is set to 19.5 MPa~21.0 MPa, and the vulcanization time is set to 390 min.
[0021] The beneficial effects of this invention are:
[0022] (1) Compared with the use of a single-ring open overflow groove, it is necessary to ensure that the excess rubber can fill the single-ring overflow groove first. However, since the use of an open overflow groove, the excess rubber will overflow. Therefore, the amount of excess rubber needs to be much greater than the amount that fills the single-ring overflow groove. In this solution, a double-ring closed overflow groove is used. The overflow groove one and the overflow groove two are set concentrically. At the same time, the overflow groove one is connected to the tire cavity. The excess rubber begins to enter the overflow groove one. The overflow groove one is connected to the overflow groove two. Therefore, the excess rubber enters the overflow groove two through the circumferential connecting channel. Due to the double-ring design, the flow of the rubber is effectively slowed down, and the rubber buffer space is provided so that the rubber can generate backflow. At the same time, the excess rubber can also be diverted and guided through the external guide groove along the overflow groove one, so as to achieve uniform diversion and orderly discharge of the rubber, reduce overflow loss, and improve the product qualification rate and appearance quality.
[0023] (2) The amount of overflow rubber in this solution is reduced by about 50% to 70%, and the cost of rubber material is significantly reduced. The double-ring closed overflow groove design results in uniform overflow rubber and thin flash, which prevents defects such as overflow rubber accumulation, excessive flash, tire rubber shortage, and mold seam cracks that lead to tire defects. The appearance quality pass rate is high, and the first pass rate is increased by 12% to 17%, reducing rework and scrap, reducing trimming difficulty and time. The rubber material does not flow out and does not contaminate the hot plate, greatly reducing the equipment cleaning intensity. The modification is relatively simple to implement on the original mold structure and can be adapted to the vulcanization production of solid tires of various specifications.
[0024] In summary, the present invention features uniform distribution of adhesive material, no overflow, reduced adhesive loss, and improved product qualification rate and appearance quality. Attached Figure Description
[0025] Figure 1 This is a top view of the lower mold in this invention.
[0026] Figure 2 for Figure 1 A sectional view of CC.
[0027] Figure 3 for Figure 2 A magnified view of section A in the image.
[0028] Figure 4 for Figure 2 A magnified view of section B in the image. Detailed Implementation
[0029] The present invention will be further described below with reference to the embodiments and accompanying drawings:
[0030] Combination Figure 1 — Figure 4As shown, a double-ring closed overflow mold for solid tire vulcanization process consists of an upper mold 1 and a lower mold 2. The upper mold 1 and lower mold 2 are assembled to form a tire cavity 6 for placing the tire blank. When the upper mold 1 and lower mold 2 are closed, the outer parting surfaces are assembled to form concentric overflow ring grooves 3 and 4. The overflow ring groove 3 is close to the tire cavity 6 and is connected to the tire cavity 6. A circumferential connecting channel 7 is provided between the overflow ring groove 3 and the overflow ring groove 4 of the lower mold 2, thereby providing a buffer space for excess rubber. The overflow ring groove 3 of the lower mold 2 is evenly distributed with radially extending outer guide grooves 5. The outer end of the outer guide groove 5 passes through the overflow ring groove 4 and extends to near the outer side wall of the lower mold 2, thereby guiding the excess rubber to flow evenly. The outer port of the outer guide groove 5 is provided with a sealing structure to intercept the rubber.
[0031] The preferred mold closing gap between the upper mold 1 and the lower mold 2 is 0.6mm to 1mm.
[0032] The upper mold 1 and the lower mold 2 are provided with grid-shaped circumferentially penetrating exhaust grooves 61 on the inner side of the tire cavity 6. The exhaust grooves 61 are used to discharge the gas generated during the vulcanization process. The exhaust ridges generated by the exhaust grooves 61 in the prepared tire are used for exhaust and heat dissipation when the tire is in use.
[0033] The outer edges of the tires prepared by the upper mold 1 and the lower mold 2 are provided with vent holes at intervals in the circumferential direction.
[0034] When the upper mold 1 and the lower mold 2 are closed, the inner parting surface is assembled to form an circumferential inner overflow groove 8. The circumferential inner overflow groove 8 is close to the tire cavity 6. The circumferential inner overflow groove 8 located in the lower mold 2 has inner guide grooves 81 that extend radially away from the tire cavity 6 at circumferential intervals.
[0035] The sealing structure adopts the sealing plate on the outer side wall of the lower mold 2 corresponding to the outer port of the outer guide groove 5 or welded. The outer guide groove 5 preferably has 12 grooves, and the inner guide groove 81 preferably has 6 grooves. The groove depth is preferably 3mm to 4mm and the groove width is preferably 16mm to 17mm.
[0036] The overflow groove 3 is connected to the tire cavity 6 through an annular channel 31. The annular channel 31 has a cross-section that narrows in the middle and has flared openings at both ends, with the opening facing the overflow groove 3 being larger than the opening facing the tire cavity 6.
[0037] A method for sealing excess rubber in the vulcanization process of solid tires using a double-ring sealant, the specific implementation steps of which are as follows:
[0038] Step S1: Use any of the above-mentioned double-ring closed overflow molds for solid tire vulcanization process to preheat the tire blank, and set the vulcanization temperature, vulcanization pressure and vulcanization time.
[0039] In step S1, the vulcanization temperature is set to 145±3℃, the vulcanization pressure is set to 19.5 MPa~21.0 MPa, and the vulcanization time is set to 390 min.
[0040] In step S2, during the vulcanization process, excess rubber gradually flows outward and is stored through overflow ring groove 1 3, overflow ring groove 2 4, and external guide groove 5. At the same time, the rubber material is prevented from overflowing due to the sealing of the outer end of the external guide groove 5.
[0041] Step S3: After vulcanization, open the mold, remove the prepared tire, and clean up any excess rubber.
[0042] Example 1
[0043] When the tire prepared by the tire cavity 6 is 8-9 inches and has a tonnage of 400T, the inner diameter of the overflow ring groove 1 3 and overflow ring groove 2 4 is 6mm-8mm, the upper and lower molds are provided with venting holes, and the mold closing gap between the upper and lower molds is 0.6mm.
[0044] Example 2
[0045] When the tire prepared by the tire cavity 6 is 10 inches and has a tonnage of 600T, the inner diameter of the overflow ring groove 1 3 and overflow ring groove 2 4 is 6mm to 8mm, the upper and lower molds are provided with venting holes, and the mold closing gap between the upper and lower molds is 0.6mm.
[0046] Example 3
[0047] When the tire prepared by the tire cavity 6 is 12-inch to 15-inch and has a tonnage of 800T, the inner diameter of the overflow ring groove 1 3 and the overflow ring groove 2 4 is 8mm to 10mm, the upper and lower molds are provided with venting holes, and the mold closing gap between the upper and lower molds is 0.6mm.
[0048] Example 4
[0049] When the tire prepared by the tire cavity 6 is 15 inches and has a tonnage of 1800T, the inner diameter of the overflow ring groove 1 3 and the overflow ring groove 2 4 is 10mm to 12mm, the upper and lower molds are provided with venting holes, and the mold closing gap between the upper and lower molds is 0.6mm.
[0050] Example 5
[0051] When the tire prepared by the tire cavity 6 is 20 inches and has a tonnage of 1800T, the inner diameter of the overflow ring groove 1 3 and the overflow ring groove 2 4 is 12mm to 14mm, the upper and lower molds are provided with venting holes, and the mold closing gap between the upper and lower molds is 0.6mm.
[0052] The unit consumption of the tires in the above embodiments was compared with that of tires of the same size and tonnage before the improvement using a single-ring open overflow groove. The statistical data were compiled into the following table:
[0053] .
[0054] As can be seen from the table above, the use of a double-ring closed overflow groove can significantly improve the single consumption of overflow. Since this mold will not have defects such as overflow accumulation, excessive flash, insufficient tire glue, or cracks in the mold seam that lead to unqualified appearance quality, the first pass rate is greatly improved by 12%-17%.
Claims
1. A double-ring closed overflow mold for solid tire vulcanization process, comprising an upper mold (1) and a lower mold (2), wherein the upper mold (1) and the lower mold (2) are assembled to form a tire cavity (6) for housing the tire blank, characterized in that: When the upper mold (1) and the lower mold (2) are closed, the outer parting surfaces are assembled to form concentric overflow ring groove one (3) and overflow ring groove two (4). The overflow ring groove one (3) is close to the tire cavity (6) and is connected to the tire cavity (6). A circumferential connecting channel (7) is provided between the overflow ring groove one (3) and the overflow ring groove two (4) of the lower mold (2) to provide a buffer space for excess rubber. The overflow ring groove one (3) of the lower mold (2) is evenly distributed with radially extending outer guide grooves (5). The outer end of the outer guide groove (5) extends through the overflow ring groove two (4) to the outer side wall of the lower mold (2), so as to guide the excess rubber to flow evenly. The outer port of the outer guide groove (5) is provided with a sealing structure to intercept the rubber.
2. The double-ring closed overflow mold for solid tire vulcanization process according to claim 1, characterized in that: When the tire prepared by the tire cavity (6) is 8 inches to 10 inches, the inner diameter of the first overflow groove (3) and the second overflow groove (4) is 6 mm to 8 mm. When the tire prepared by the tire cavity (6) is 12 inches to 15 inches, the inner diameter of the first overflow groove (3) and the second overflow groove (4) is 8 mm to 10 mm. When the tire prepared by the tire cavity (6) is 15 inches, the inner diameter of the first overflow groove (3) and the second overflow groove (4) is 10 mm to 12 mm. When the tire prepared by the tire cavity (6) is 20 inches, the inner diameter of the first overflow groove (3) and the second overflow groove (4) is 12 mm to 14 mm.
3. The double-ring closed overflow mold for solid tire vulcanization process according to claim 1, characterized in that: The mold closing gap between the upper mold (1) and the lower mold (2) is 0.6mm to 1mm.
4. A double-ring closed overflow mold for solid tire vulcanization process according to claim 1, characterized in that: The upper mold (1) and lower mold (2) are provided with grid-shaped circumferentially penetrating exhaust grooves (61) on the inner side of the tire cavity (6). The exhaust grooves (61) are used to discharge the gas generated during the vulcanization process. The exhaust ridges generated by the exhaust grooves (61) of the prepared tire are used for exhaust heat dissipation when the tire is in use.
5. A double-ring closed overflow mold for solid tire vulcanization process according to claim 1, characterized in that: The upper mold (1) and lower mold (2) are provided with vent holes at circumferential intervals on the outer corners of the tires prepared accordingly. The sealing structure is a sealing plate made by welding the outer wall of the lower mold (2) corresponding to the outer port of the outer guide groove (5).
6. A double-ring closed overflow mold for solid tire vulcanization process according to claim 1, characterized in that: The overflow groove (3) is connected to the tire cavity (6) through an annular channel (31). The annular channel (31) has a cross-section that narrows in the middle and has flared openings at both ends. The opening facing the overflow groove (3) is larger than the opening facing the tire cavity (6).
7. A double-ring closed overflow mold for solid tire vulcanization process according to claim 1, characterized in that: When the upper mold (1) and the lower mold (2) are closed, the inner parting surface is assembled to form an circumferential inner overflow groove (8). The circumferential inner overflow groove (8) is close to the tire cavity (6). The circumferential inner overflow groove (8) located in the lower mold (2) has inner guide grooves (81) that extend radially away from the tire cavity (6) at circumferential intervals.
8. A double-ring closed overflow mold for solid tire vulcanization process according to claim 7, characterized in that: The outer guide channel (5) consists of 12 channels, and the inner guide channel (81) consists of 6 channels, with a channel depth of 3mm to 4mm and a channel width of 16mm to 17mm.
9. A method for sealing excess rubber in the vulcanization process of solid tires using a double-ring sealant, characterized in that, Includes the following steps: Step S1: Using any of the double-ring closed overflow molds for solid tire vulcanization processes as described in claims 1-8, preheat the tire blank by mold closing, and set the vulcanization temperature, vulcanization pressure, and vulcanization time. Step S2: During the vulcanization process, excess rubber gradually flows outward and is stored through overflow ring groove one (3), overflow ring groove two (4), and external guide groove (5). At the same time, the rubber flows back and does not overflow due to the sealing of the outer end of the external guide groove (5). Step S3: After vulcanization, open the mold, remove the prepared tire, and clean up any excess rubber.
10. A method for sealing excess rubber in the vulcanization process of solid tires according to claim 9, characterized in that: In step S1, the vulcanization temperature is set to 145±3℃, the vulcanization pressure is 19.5 MPa~21.0 MPa, and the vulcanization time is 390 min.