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为解决轮胎硫化过程中各部位温差大、硫化不均匀、一些部位出现过硫化和外温管道加热不均匀的情况,试验一种新型中心机构和新型硫化模具。优化中心机构的结构和喷射角度,对现有模具外温加热管道进行调整,改变现有模具安装方式,并对模具结构和外温管道进行优化。利用新型中心机构和新型模具能够有效减小硫化过程中轮胎各部位温差,提高轮胎硫化均匀性,缩短轮胎硫化时间,提高轮胎质量。 相似文献
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选取18.00-25 40PR TL510规格轮胎进行不同硫化工艺测温试验,分析研究合适的内冷却硫化工艺条件。与传统过热水硫化工艺相比,内冷却硫化工艺是在内温过热水循环一段时间后切换为冷却水循环,同时提前关闭外温蒸汽,降低胎体帘线出罐时温度,减少轮胎从出罐到进行后充气期间的帘线收缩,并降低轮胎过硫度和硫化能耗,改善轮胎硫化均匀性,提高轮胎质量。 相似文献
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正授权公告号:CN 106541527B授权公告日:2018年11月13日专利权人:风神轮胎股份有限公司发明人:张艳丽、朱海涛、陈丽萍等本发明介绍了一种全钢工程轮胎变温硫化工艺。轮胎硫化加热系统由外至内为模具、轮胎和胶囊。胶囊内温度为内温,模具外温度为外温,内外温都采用变温过程。前期胶囊内通入170~180℃ 相似文献
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《Journal of Adhesion Science and Technology》2013,27(7):995-1016
Adhesive joints consist of adherends and an adhesive layer having different thermal and mechanical properties. When they are exposed to uniform thermal loads the mechanical-thermal mismatches of the adherends and adhesive layer result in uniform but different thermal strain distributions in the adhesive and adherends. The thermal stresses arise near and along the adherend-adhesive interfaces. The present thermal stress analyses of adhesively bonded joints assume a uniform temperature distribution or a constant temperature imposed along the outer boundaries of adhesive lap joints. This paper outlines the thermal analysis and geometrically non-linear stress analysis of adhesive joints subjected to different plate edge conditions and varying thermal boundary conditions causing large displacements and rotations. In addition, the geometrically non-linear thermal stress analysis of an adhesively bonded T-joint with single support plus angled reinforcement was carried out using the incremental finite element method, which was subjected to variable thermal boundary conditions, i.e. air streams with different temperatures and velocities parallel and perpendicular to its outer surfaces. The steady state heat transfer analysis showed that the temperature distribution through the joint members was non-uniform and high heat fluxes occurred inside the adhesive fillets at the adhesive free ends. Based on the geometrically non-linear stress analysis of the T-joint bonded to both rigid and flexible bases for different plate edge conditions, stress concentrations were observed at the free ends of adhesive-adherend interfaces and inside the adhesive fillets around the adhesive free ends, and the horizontal and vertical plates also experienced considerable stress distributions along outer surfaces. In addition, the effect of support length on the peak thermal adhesive stresses was found to be dependent on the plate edge conditions, when a support length allowing moderate adhesive stresses was present. 相似文献
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利用ABAQUS软件对子午线轮胎11R22.5进行硫化仿真分析,通过模型建立、材料参数及边界条件赋予等,建立起了仿真分析的硫化温度场和程度场云图。通过与轮胎硫化测温实验结果对比得到,各测温点仿真分析的硫化温度和硫化程度与实验结果基本吻合,验证了此分析方法的可行性。对硫化过程中的初始条件、边界条件及材料参数因素进行分析,得出轮胎初始温度、外温和胶囊的导热系数对轮胎的硫化程度影响较大。总体来说,目前初步建立起轮胎仿真的分析平台,并可为轮胎硫化工艺的优化提出理论指导。 相似文献
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本文对橡胶制品,于硫化时,在两边传热介质温度不同或温度相同的条件下,内部温度場的变化提出了理论计算的方法。 对于复杂橡胶制品,如汽车轮胎在硫化时内部温度場变化的理论计算,虽然各国橡胶学者曾提出过解答方法,但对于轮胎采用逐步升温硫化,即外界热源随时间而变化的计算方法还没有成功。因此,我们假设了一种“综合的”或“相似的”准数,应用板状橡胶制品的导热理论公式来计算,所得结果与实际测得的非常接近。 我们并且制作了图表,简化了计算方法。最后,提出了硫化效应的计算和制订硫化技术条件的方法。 相似文献
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对圆管壁稳态、有内热源、定物性、内壁恒温、外壁变温情况下的导热,采用变量分离法导出了传热方程的温度分布及热量计算关系式。对圆管外壁周向温度不同变化对传热的影响进行了讨论。 相似文献
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目前对螺旋管在其管外表面均匀受热,管内两相流动换热的研究已十分丰富;但是在其管外表面非均匀受热条件下,管内两相流动沸腾换热特性的研究鲜有报道。为了解决螺旋管在实际运用中遇到的非均匀受热问题、得到其换热特性,本文采用了实验的方法研究了卧式螺旋管周向非均匀受热条件下管内流动沸腾换热特性。其中实验工况范围为系统压力P=0.7~1.0MPa,质量流速G=181~364kg/(m2·s),质量干度χ=0.07~0.69。实验考察了螺旋管管外壁在两种非均匀受热条件下管内的两相流动沸腾换热系数与热流密度、质量流速、质量干度的关系,并与管周向均匀受热工况进行了比较。结果表明,在螺旋管外壁面“外半周绝热、内半周受热”情况下管内流动沸腾换热系数值最大,而管外壁面“内半周绝热、外半周受热”情况下最小。 相似文献
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《国际聚合物材料杂志》2012,61(3-4):597-615
Abstract The cure time of accelerated sulphur vulcanization of Epoxidized Natural Rubber (ENR 25) was studied while one grade of unmodified natural rubber– Standard Malaysian Rubber Light (SMR L) was used as a control. Five accelerators, viz. 2-mercaptoben-zothiazole (MBT), tetramethylthiuram disulphide (TMTD), zinc dimethyldithiocarbamate (ZDMC), N-tert-butyl-2-benzothiazylsulphenamide (TBBS) and diphenylguanidine (DPG) were used in the study and the vulcanization systems used were conventional vulcanization (CV), semi-efficient vulcanization (semi-EV) and efficient vulcanization (EV). Monsanto Moving-Die Rheometer (MDR 2000) was used to determined the cure time in the temperature range of 100-180°C. The results indicate that cure time decreases exponentially with increasing temperature for the two rubbers studied. At a fixed curing temperature, ENR 25 shows shorter cure time compared to that of SMR L. This has been attributed to the activation of the double bond by the adjacent epoxide group in ENR 25. Studies of the effect of varying amounts of M Bata a fixed sulphur concentration show that cure time decreases as the accelerator concentration increases. ENR 25 shows higher torque maximum than SMR L. This observation can be related to the oxirane group which is bulky and thus accounts for increased glass; transition temperature with increase in the level of epoxidation. Of the vulcanization systems, CV shows the highest torque maximum followed by semi-EV and than EV. This trend can be attributed to the amount of active sulphurating agent which increases with increasing accelerator concentration. It was also found that the influence of accelerator/sulphur ratio becomes less significant as vulcanization temperature increases. 相似文献
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利用ANSYS热分析模块,得到圆柱形橡胶厚制品在传统工艺条件下的温度变化过程,并绘出制品不同位置胶料的硫化效应曲线。根据橡胶材料的硫化条件,计算得到其最小硫化效应及最大硫化效应,结果发现传统工艺条件下的制品在内层达到最小硫化效应时外层严重过硫。改变工艺条件,通过APDL参数化语言设计,实现由5级硫化温度与9级硫化加热时间组成的45组不同工艺条件的循环分析、结果存储及自动筛选,得到硫化质量满足要求且效率相对较高的工艺组别。结果表明,采用APDL参数化语言,进行数值模拟分析,能够实现橡胶厚制品硫化工艺条件的优化设计。 相似文献