Vulcanization process suitable for vulcanizing tire through direct-pressure electromagnetic heating of inner mold and outer mold
Through the internal and external mold direct-pressure electromagnetic heating vulcanization process, the temperature difference caused by steam heat exchange during tire vulcanization is solved, and the uniformity of the temperature rise of the inner surface of the tire is improved and the production efficiency is improved.
Patent Information
- Application Number
- CN202510082774.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-04-18
AI Technical Summary
In the existing tire vulcanization process, condensate water is generated due to steam heat exchange, which leads to a temperature difference between the upper and lower side tires, affecting the uniformity and efficiency of vulcanization.
The internal and external mold direct-voltage electromagnetic heating vulcanization process is adopted to heat the inner and outer surfaces of the fetal embryos through the principle of electromagnetic induction to ensure uniform temperature rise in all parts of the inner surface of the tire.
The uniformity of the temperature rise of the inner surface of the tire is achieved, the electromagnetic heating efficiency and heating speed are improved, the vulcanization time is shortened, and the production efficiency is improved.
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Abstract
Description
Technical Field
[0001] The invention relates to the field of tire vulcanization, in particular to a vulcanization process suitable for vulcanizing tires by direct pressure electromagnetic heating of inner and outer molds. Background Art
[0002] As we all know, most tire manufacturers now use saturated steam and nitrogen as two vulcanization media to vulcanize tires. During the tire vulcanization process, the vulcanization capsule needs to be loaded into the tire embryo, and the vulcanization medium is sprayed into the vulcanization capsule through the injection device. The saturated steam provides the temperature required for vulcanization, and the nitrogen provides the pressure required for vulcanization. The capsule then transfers the temperature and pressure to the tire embryo, and the tire vulcanization process is completed after a certain period of time. The traditional capsule heating produces condensed water due to the heat exchange of steam, resulting in a temperature difference between the upper and lower sidewalls. During the vulcanization heating process, the temperature of the upper mold will be higher than that of the lower mold, and the temperature rise of various parts of the inner surface of the tire is uneven. Summary of the invention
[0003] In order to overcome the shortcomings of the prior art, the present invention provides a vulcanization process suitable for inner and outer mold direct pressure electromagnetic heating vulcanization tires. The temperature rise of various parts on the inner surface of the tire is uniform, and there will be no temperature difference between the upper and lower sidewalls caused by condensed water generated by steam heat exchange.
[0004] The technical solution adopted by the present invention to solve its technical problems is: a vulcanization process suitable for inner and outer mold direct pressure electromagnetic heating vulcanization tires, which includes a mold opening and tire embryo loading stage, a mold closing positive vulcanization early stage, a mold closing positive vulcanization late stage and a mold opening and tire unloading stage in the entire vulcanization cycle, and is characterized in that the mold opening and tire embryo loading stage lasts for 0.5 to 1.0 minutes, the upper and lower sub-mouth area temperature is 165 to 185 degrees, the upper and lower sidewall area temperature is 163 to 183 degrees, the upper and lower shoulder area temperature is 165 to 185 degrees, the crown middle area is 163 to 183 degrees, and the tile temperature is 165 to 185 degrees; the mold closing positive vulcanization early stage lasts for 5 to 10 minutes, the upper and lower sub-mouth area temperature is 165 to 185 degrees, the upper and lower sidewall area temperature is 163 to 183 degrees , the temperature of the upper and lower shoulder areas is 165-185 degrees, the middle area of the crown is 163-183 degrees, and the temperature of the tile is 165-185 degrees; in the late stage of mold closing and positive vulcanization, the time is 5-10 minutes, the temperature of the upper and lower sub-mouth areas is 165-185 degrees, the temperature of the upper and lower sidewall areas is 163-183 degrees, the temperature of the upper and lower shoulder areas is 165-185 degrees, the middle area of the crown is 163-183 degrees, and the temperature of the tile is 0 degree; in the mold opening and tire unloading stage, the time is 0.5-1.0 minute, the temperature of the upper and lower sub-mouth areas is 165-185 degrees, the temperature of the upper and lower sidewall areas is 163-183 degrees, the temperature of the upper and lower shoulder areas is 165-185 degrees, the middle area of the crown is 163-183 degrees, and the temperature of the tile is 165-185 degrees.
[0005] The beneficial effects of the present invention are that the temperature rise of each part of the inner surface of the tire is uniform, the electromagnetic heating efficiency is high, the heating speed is fast, the vulcanization time of the tire can be greatly shortened, and the production efficiency of the tire is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0006] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0007] Figure 1 It is a schematic diagram of the temperature of the tile of the present invention.
[0008] Figure 2 It is a schematic diagram of the temperatures of the upper and lower hot plates of the present invention.
[0009] Figure 3 Schematic diagram of the mold sleeve temperature of the present invention.
[0010] Figure 4 is a schematic diagram of different regions of a tire of the present invention.
[0011] Figure 5 It is a schematic diagram of the vulcanization process parameters of the present invention.
[0012] Figure 6 The vulcanization process parameters of Example 1 are
[0013] In the figure, 1. upper and lower tire mouth areas; 2. upper and lower sidewall areas; 3. upper and lower shoulder areas; 4. middle crown area. DETAILED DESCRIPTION
[0014] In order to save energy and reduce emissions, improve production efficiency and the comprehensive performance of tires, the inner and outer mold direct pressure electromagnetic heating vulcanizer jointly developed by Triangle Tire Co., Ltd. and Beijing University of Chemical Technology has been used in batches to vulcanize passenger car tires. This vulcanizer device consists of a forming drum structure, an electromagnetic heating device and a tire mold. The vulcanizing capsule on the existing center mechanism of the finalizing vulcanizer is replaced with a steel forming drum structure, and the original saturated steam heating method is changed to electromagnetic heating by using the principle of electromagnetic induction. During vulcanization, the drum tiles of the forming drum heat the inner surface of the tire embryo; the heating method of the tire outer mold is also changed from saturated steam to electromagnetic heating, and the outer surface of the tire embryo is electromagnetically heated. The drum tiles of the forming drum and the outer mold work together to apply direct pressure vulcanization pressure to the tire blank, replacing the vulcanization pressure provided by the original nitrogen to the tire embryo. During the vulcanization heating process, the temperature rise of each part of the inner surface of the tire is uniform, and there will be no temperature difference between the upper and lower sidewalls caused by condensed water generated by steam heat exchange. Electromagnetic heating has high efficiency and fast heating speed, which can greatly shorten the vulcanization time of the tire and improve the production efficiency of the tire. After years of verification, according to the characteristics of the direct pressure electromagnetic heating vulcanizer for inner and outer molds, the temperature of the electromagnetic heating tile is different from the traditional heating method of saturated steam through the capsule. The characteristics of the internal and external temperatures of electromagnetic heating are: first, the heating temperature rises faster than the traditional capsule heating. At the same time, when the mold is opened to load the tire embryo and the finished tire is unloaded after the vulcanization, the drum tile is easy to lose heat; second, there is no temperature difference between the upper mold temperature and the lower mold temperature of the electromagnetic heating tile, while the traditional capsule heating will have a temperature higher than the lower mold temperature due to condensed water; third, the upper mold, mold sleeve, and lower mold can be based on the characteristics of the construction of the passenger car tire structure. The upper and lower mouth parts of the passenger car tire are thicker, the upper and lower sidewall parts are thinner, the upper and lower shoulder parts are thicker, and the crown part is thinner. Therefore, different temperature values can be set for the upper and lower hot plates, mold sleeves, and forming drum tiles according to different parts of the tire. According to the above characteristics, a direct pressure vulcanization process for passenger car tires suitable for electromagnetic heating of tile temperature and external temperature is formulated, thereby achieving energy conservation and emission reduction, improving production efficiency and the comprehensive performance of tires.
[0015] The present invention is described by taking the tire pattern of a passenger car 225 / 40R18 as a representative specification, and the vulcanization process parameters are set in the PLC human-machine exchange interface as follows: Figure 5 The vulcanization process parameters are shown in Figure 2.
[0016] Embodiment 1:
[0017] 1. Vulcanization cycle time setting
[0018] The time for the mold opening and tire loading stage is set to 0.5 minutes; the time for the mold closing and positive vulcanization pre-stage is set to 5.0 minutes; the time for the mold closing and positive vulcanization post-stage is set to 5.0 minutes; the time for the mold opening and tire unloading stage is set to 0.5 minutes;
[0019] 2. Temperature settings in different areas of the vulcanization cycle
[0020] Forming drum tile temperature: Figure 1 As shown, the temperature is set at 172 degrees in the mold opening and tire loading stage; the temperature is set at 170 degrees in the mold closing and positive vulcanization early stage; the temperature is set at zero degrees in the mold closing and positive vulcanization late stage; the temperature is set at 172 degrees in the mold opening and tire unloading stage.
[0021] The upper and lower mold sleeves correspond to the upper and lower shoulder area 3 temperature: Figure 3 As shown, the temperature is set at 172 degrees in the mold opening and tire loading stage; the temperature is set at 170 degrees in the mold closing and positive vulcanization early stage; the temperature is set at 170 degrees in the mold closing and positive vulcanization late stage; the temperature is set at 172 degrees in the mold opening and tire unloading stage.
[0022] The temperature of the middle crown area 4 corresponding to the middle mold sleeve is: Figure 3 As shown, the temperature is set at 170 degrees in the mold opening and tire loading stage; the temperature is set at 168 degrees in the mold closing and positive vulcanization early stage; the temperature is set at 168 degrees in the mold closing and positive vulcanization late stage; the temperature is set at 170 degrees in the mold opening and tire unloading stage.
[0023] The temperature of the upper and lower sub-port areas 1 corresponding to the upper and lower hot plates: Figure 2 As shown, the temperature is set at 172 degrees in the mold opening and tire loading stage; the temperature is set at 170 degrees in the mold closing and positive vulcanization early stage; the temperature is set at 170 degrees in the mold closing and positive vulcanization late stage; the temperature is set at 172 degrees in the mold opening and tire unloading stage.
[0024] The temperature of the upper and lower sidewall areas 2 corresponding to the upper and lower heating plates: Figure 2 As shown, the temperature is set at 170 degrees in the mold opening and tire loading stage; the temperature is set at 168 degrees in the mold closing and positive vulcanization early stage; the temperature is set at 168 degrees in the mold closing and positive vulcanization late stage; the temperature is set at 170 degrees in the mold opening and tire unloading stage.
[0025] The vulcanization process steps are as follows: Figure 5 The vulcanization process parameters are shown in
[0026] Step 1: Open the mold and install the tire blank, the time is 0.5 minutes, the temperature of the upper and lower sub-mouth area 1 is 172 degrees; the temperature of the upper and lower sidewall area 2 is 170 degrees; the temperature of the upper and lower shoulder area 3 is 172 degrees; the middle crown area 4 is 170 degrees; the tile temperature is set to 172 degrees.
[0027] Step 2: In the early stage of mold closing and vulcanization, the time is 5.0 minutes, the temperature of the upper and lower sub-mouth area 1 is 170 degrees; the temperature of the upper and lower sidewall area 2 is 168 degrees; the temperature of the upper and lower shoulder area 3 is 170 degrees; the middle crown area 4 is 168 degrees; the tile temperature is set to 170 degrees.
[0028] Step 3: In the late stage of mold vulcanization, the time is 5.0 minutes, the temperature of the upper and lower sub-mouth area 1 is 170 degrees; the temperature of the upper and lower sidewall area 2 is 168 degrees; the temperature of the upper and lower shoulder area 3 is 170 degrees; the middle crown area 4 is 168 degrees; the tile temperature is set to 0 degrees.
[0029] Step 4: Open the mold and unload the tire. The time is 0.5 minutes. The temperature of the upper and lower sub-mouth area 1 is 172 degrees; the temperature of the upper and lower sidewall area 2 is 170 degrees; the temperature of the upper and lower shoulder area 3 is 172 degrees; the middle crown area 4 is 170 degrees; the temperature of the tile is 172 degrees.
[0030] Step 5: The vulcanization cycle of the first tire is completed and the next tire embryo loading stage begins.
[0031] The present invention is described by taking the tread pattern of a passenger car tire 225 / 40R18 snow tire as a representative specification, and the vulcanization process parameters are set in the PLC human-machine exchange interface as follows: Figure 6 The vulcanization process parameters are shown in Figure 2.
[0032] Embodiment 2:
[0033] 1. Vulcanization cycle time setting
[0034] The time for the mold opening and tire loading stage is set to 0.5 minutes; the time for the mold closing and positive vulcanization pre-stage is set to 7.0 minutes; the time for the mold closing and positive vulcanization post-stage is set to 7.0 minutes; the time for the mold opening and tire unloading stage is set to 0.5 minutes;
[0035] 2. Temperature settings in different areas of the vulcanization cycle
[0036] Forming drum tile temperature: Figure 1 As shown, the temperature is set at 167 degrees in the mold opening and tire loading stage; the temperature is set at 165 degrees in the mold closing and positive vulcanization early stage; the temperature is set at zero degrees in the mold closing and positive vulcanization late stage; the temperature is set at 167 degrees in the mold opening and tire unloading stage.
[0037] The upper and lower mold sleeves correspond to the upper and lower shoulder area 3 temperature: Figure 3 As shown, the temperature is set at 167 degrees in the mold opening and tire loading stage; the temperature is set at 165 degrees in the mold closing and positive vulcanization early stage; the temperature is set at 165 degrees in the mold closing and positive vulcanization late stage; the temperature is set at 167 degrees in the mold opening and tire unloading stage.
[0038] The temperature of the middle crown area 4 corresponding to the middle mold sleeve is: Figure 3 As shown, the temperature is set at 165 degrees in the mold opening and tire loading stage; the temperature is set at 163 degrees in the mold closing and positive vulcanization early stage; the temperature is set at 163 degrees in the mold closing and positive vulcanization late stage; the temperature is set at 165 degrees in the mold opening and tire unloading stage.
[0039] The temperature of the upper and lower sub-port areas 1 corresponding to the upper and lower hot plates: Figure 2As shown, the temperature is set at 167 degrees in the mold opening and tire loading stage; the temperature is set at 165 degrees in the mold closing and positive vulcanization early stage; the temperature is set at 165 degrees in the mold closing and positive vulcanization late stage; the temperature is set at 167 degrees in the mold opening and tire unloading stage.
[0040] The temperature of the upper and lower sidewall areas 2 corresponding to the upper and lower heating plates: Figure 2 As shown, the temperature is set at 165 degrees in the mold opening and tire loading stage; the temperature is set at 163 degrees in the mold closing and positive vulcanization early stage; the temperature is set at 163 degrees in the mold closing and positive vulcanization late stage; the temperature is set at 165 degrees in the mold opening and tire unloading stage.
[0041] The vulcanization process steps are as follows: Figure 5 The vulcanization process parameters are shown in
[0042] Step 1: Open the mold and install the tire blank, the time is 0.5 minutes, the temperature of the upper and lower sub-mouth area 1 is 167 degrees; the temperature of the upper and lower sidewall area 2 is 165 degrees; the temperature of the upper and lower shoulder area 3 is 167 degrees; the middle crown area 4 is 165 degrees; the tile temperature is set to 167 degrees.
[0043] Step 2: In the early stage of mold closing and vulcanization, the time is 7.0 minutes, the temperature of the upper and lower sub-mouth area 1 is 165 degrees; the temperature of the upper and lower sidewall area 2 is 163 degrees; the temperature of the upper and lower shoulder area 3 is 165 degrees; the middle crown area 4 is 163 degrees; the tile temperature is set to 165 degrees.
[0044] Step 3: In the late stage of mold vulcanization, the time is 7.0 minutes, the temperature of the upper and lower sub-mouth area 1 is 165 degrees; the temperature of the upper and lower sidewall area 2 is 163 degrees; the temperature of the upper and lower shoulder area 3 is 165 degrees; the middle crown area 4 is 163 degrees; the tile temperature is set to 0 degrees.
[0045] Step 4: Open the mold and unload the tire. The time is 0.5 minutes. The temperature of the upper and lower sub-mouth area 1 is 167 degrees; the temperature of the upper and lower sidewall area 2 is 165 degrees; the temperature of the upper and lower shoulder area 3 is 167 degrees; the middle crown area 4 is 165 degrees; the tile temperature is set to 167 degrees.
[0046] Step 5: The vulcanization cycle of the first tire is completed and the next tire embryo loading stage begins.
Claims
1. A vulcanization process suitable for vulcanizing tires by direct pressure electromagnetic heating of inner and outer molds, which includes a mold opening stage for loading tire embryos, a mold closing stage for positive vulcanization, a mold closing stage for positive vulcanization, and a mold opening stage for unloading tires in the entire vulcanization cycle, and is characterized in that: In the mold opening and tire blank loading stage, the time is 0.5 to 1.0 minutes, the upper and lower sub-mouth area temperature is 165 to 185 degrees, the upper and lower sidewall area temperature is 163 to 183 degrees, the upper and lower shoulder area temperature is 165 to 185 degrees, the crown middle area is 163 to 183 degrees, and the tile temperature is 165 to 185 degrees; in the mold closing and positive vulcanization early stage, the time is 5 to 10 minutes, the upper and lower sub-mouth area temperature is 165 to 185 degrees, the upper and lower sidewall area temperature is 163 to 183 degrees, the upper and lower shoulder area temperature is 165 to 185 degrees, the crown middle area is 163 to 183 degrees, and the tile temperature is 165 to 18 5 degrees; in the late stage of mold closing and vulcanization, the time is 5 to 10 minutes, the temperature of the upper and lower sub-mouth areas is 165 to 185 degrees, the temperature of the upper and lower sidewall areas is 163 to 183 degrees, the temperature of the upper and lower shoulder areas is 165 to 185 degrees, the middle area of the crown is 163 to 183 degrees, and the temperature of the tile is 0 degrees; in the mold opening and tire unloading stage, the time is 0.5 to 1.0 minute, the temperature of the upper and lower sub-mouth areas is 165 to 185 degrees, the temperature of the upper and lower sidewall areas is 163 to 183 degrees, the temperature of the upper and lower shoulder areas is 165 to 185 degrees, the middle area of the crown is 163 to 183 degrees, and the temperature of the tile is 165 to 185 degrees.