Variable temperature vulcanization process for all-steel engineering tires

Abstract

The invention provides an all-steel engineering tire variable-temperature vulcanization technology. A mold, a tire and a capsule are sequentially arranged from outside to inside. The temperature in the capsule is the inner temperature, the temperature outside the mold is the outer temperature, and the inner and outer temperatures are all variable. Previously, high-temperature steam with the temperature being 170-180 DEG C is led into the capsule to rapidly raise the temperature of the tire, then the high-temperature steam is switched into high-temperature and high-pressure circulation water, vulcanization is conducted for a certain time, the pressure is kept, circulation is stopped, and the inner temperature is naturally decreased to 15-40 DEG C; and latterly, outer temperature steam is stopped to enable heat on the surface of the tire to be continuously conducted to the interior of the tire, and the surface temperature is gradually decreased. The all-steel engineering tire variable-temperature vulcanization technology has the advantages that 1, on the premise that positive vulcanization of the interior of the tire is ensured, the optimum performance of rubber at all parts is maintained maximally, and therefore the overall performance of the tire is improved, and compared with equal-temperature and equal-pressure vulcanization, the tread abrasion performance is improved by 10-15%, and the indoor durability is improved by 15-30%; and 2, since heat is not complemented anymore latterly, the hot water circulation time is shortened, the outer temperature steam supply time is shortened, and energy is saved by around 30%.

Description

technical field [0001] The invention relates to a tire vulcanization process, in particular to a variable temperature vulcanization process for all-steel engineering tires. technical background [0002] At present, most of the vulcanization processes in the production process of all-steel OTR tires still use the traditional internal and external temperature isothermal and isobaric vulcanization processes. That is to say, during the entire positive vulcanization stage, the internal and external temperatures are at a certain temperature and pressure, and through the uninterrupted circulation of the medium, heat is continuously provided to the tire. But in this process, when the surface temperature of the tire rises to a certain level, the heat exchange efficiency decreases. Since the rubber is a poor conductor of heat, the heat transfer from the tire surface to the inside is slow. During this process, the tire is never interrupted. The heat absorbed by the circulating medium ...

AI Technical Summary

Problems solved by technology

But in this process, when the surface temperature of the tire rises to a certain level, the heat exchange efficiency decreases. Since the rubber is a poor conductor of heat, the heat transfer from the tire surface to the inside is slow. During this process, the tire is never interrupted. The heat absorbed by the circulating medium only accounts for a small part of the total heat of the medium, and most of the heat is ineffectively discharged or lost in the pipeline circulation process, resulting in waste of energy and increase in production costs

At the same time, due to the long vulcanization time of engineering tires, high temperature and high pressure for a long time, the performance of the rubber on the inner and outer surfaces of the tire will be reduced due to oversulfurization, thus affecting the service life of the tire

Images