| With the continuous development of the car industry,tire manufacturing is becoming more and more precise,efficient and high-performance.Vulcanization is the last process of tire manufacturing,which has a profound impact on the performance of tires.Vulcanization is the last process of tire manufacturing,which has a profound impact on the performance of tires.Although conventional capsule vulcanization has been continuously improved,many problems are still restricting the development of tires towards high performance,such as incomplete expansion of capsule,asymmetric structure,low vulcanization pressure and deposition of steam condensate water.The heat medium of traditional vulcanization process is steam and superheated water.The heat energy of medium is dissipated in transportation pipeline,resulting in low energy utilization rate and high maintenance cost.Base on direct-pressure vulcanization technology for high performance tire.A new telescopic mode of tire curing inner mold suitable for smaller rim diameter and higher flat ratio was proposed,which can solve the problem that the telescopic mode of the wedge-shaped inner mold limits application range of tire specification.A new internal die design is carried out.The traditional steam medium to heat the tire curing outer mold is replaced by the electromagnetic induction heating technology,which can realize environmental protection of tire curing external temperature.The main work of this paper is as follows:(1)The asynchronous telescopic mode of the internal mold is proposed.The asynchronous telescopic tire curing inner mold for 205/40R17 tire was designed.Based on the profile of the tire,the geometric characteristics of the metal inner mold were analyzed,and the key geometric parameters were determined.The internal transmission mechanism which can realize the asynchronous telescopic mode is designed,and a three-dimensional model of the asynchronous telescopic inner mold was established with PTC Creo.Motion simulation of asynchronous telescopic mode and collision interference test were carried out,and the model structure was optimized according to the results.(2)Strength check and displacement analysis of the asynchronous telescopic inner mold under vulcanization pressure were carried out.The stress and displacement were analyzed,and the reason of uneven stress of the model was found with ABAQUS.The structure of the model was optimized and improved according to the result.Finally,the design scheme of the asynchronous telescopic tire curing inner mold was obtained(3)An induction heating equipment for external temperature of tire vulcanization has been developed successfully.The external mold and the induction heating device suitable for induction heating were designed and manufactured.The PLC temperature control system is designed,the induction heating program is formulated,and the temperature control mode of the external mold is expounded.The equipment was debugged through the experiment of temperature uniformity of external die.(4)The working performance of the induction heating equipment for vulcanization was investigated,and the advantages and disadvantages of induction heating vulcanization at external temperature were compared experimentally.With the help of the reformed vulcanizer,the experiments of tire curing external temperature uniformity and tire curing temperature measurement were carried out with 215/75R15 tire as the research object.The experimental results show that the uniformity of external temperature supplying by induction heating process is good,and the temperature rise of each temperature measuring point is similar to conventional vulcanization process.It means that the process of external temperature supplying by induction heating meets the requirements of tire vulcanization.The energy consumption and cost of the process were analyzed.The energy consumption of the external temperature supplying by induction heating process was reduced by 81.76%and the cost of single tire vulcanization was reduced by 42.7%. |
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