精密钛合金板材无张力冷轧关键质量模型研究

For precise titanium alloy sheet cold rolling without tension, varied production specification, relatively more rolling passes,high deformation resistance and low thickness are representative characteristics. Moreover, the requirement of thickness and shape control precision is extremely strict. Whereas, the feedback control condition is absent, leading to high dependence of quality model precision of process control system. Therefore, the crucial quality models of precise titanium alloy sheet cold rolling without tension are researched in this subject, including: The proposal of deformation resistance parameters selflearning method, and the establishment of mixed kernel function support vector machine model for deformation resistance and friction factor to get the rolling force model composed of analytical model and statistical model, which is aimed to correct the main influence factors to rolling force calculation precision - deformation resistance and friction factor. The set up of shape mechanism model based on the combination of static and dynamic finite element methods for the shape generation characteristic of sheet cold rolling without tension, and the foundation of the generalized shape control model based on shape control efficiency vectors on the basis of mechanism model. The proposal of rolling schedule model based on rolling schedule characteristic curve to meet the flexibility requirement of rolling schedule design, and the establishment of the optimzation design method of rolling schedule characteristic curve for the shape optimal goal. This research is of great scientific and practical significance, and the achievement will efficiently promote the improvement of quality control level of titanium production.

精密钛合金板材无张力冷轧生产规格灵活、道次数多、变形抗力大、轧制厚度薄，板厚、板形控制精度要求极高，而板材轧制不具备反馈控制条件，使其极为依赖过程控制系统的质量模型精度。为此，本课题针对精密钛合金板材无张力冷轧关键质量模型开展研究，主要内容包括：针对影响轧制力计算精度的本质原因变形抗力与摩擦系数，设计基于构造矛盾方程组的变形抗力参数自学习方法，并针对变形抗力与摩擦系数建立混合核函数支持向量机模型，形成解析模型与统计模型相结合的轧制力模型；针对板材无张力冷轧板形生成特点，建立基于显式-隐式两步法有限元的板形机理计算模型，并在此基础上建立基于板形调控功效向量的广义板形设定计算模型；适应轧制规范灵活制定的需要，建立基于轧制规范特征曲线的轧制规范计算模型，并设计以板形最优为目标的规范特征曲线优化计算方法。本课题具有重要的科学意义与应用价值，研究成果将对提高我国钛加工质量控制水平产生积极推动作用。

近年来，随着国民经济的飞速发展，钛及钛合金用量迅猛增长。然而，高精度钛及钛合金薄规格板带仍然需要进口。精密钛合金板由于单批次需求较小、定制化要求高，达不到可卷取长度，较多地采用单张板无张力轧制的方式。板材无张力冷轧生产规格灵活、道次数多、变形抗力大、轧制厚度薄，板厚、板形控制精度要求极高，而板材轧制不具备反馈控制条件，使其极为依赖过程控制系统的质量模型精度。为此，本课题针对精密钛合金板材无张力冷轧关键质量模型开展研究，主要内容包括：针对影响轧制力计算精度的本质原因变形抗力与摩擦系数，设计基于构造矛盾方程组的变形抗力参数自学习方法，并针对变形抗力与摩擦系数建立混合核函数支持向量机模型，形成解析模型与统计模型相结合的轧制力模型；针对板材无张力冷轧板形生成特点，建立基于显式-隐式两步法有限元的板形机理计算模型，并在此基础上建立基于板形调控功效向量的广义板形设定计算模型；适应轧制规范灵活制定的需要，建立基于轧制规范特征曲线的轧制规范计算模型，并设计以板形最优为目标的规范特征曲线优化计算方法。本课题将精密钛合金板材无张力冷轧质量模型，形成一套钛合金板材轧制设定控制系统应用软件，应用于某钛合金生产企业，针对小批量、定制化、薄规格的特种钛合金薄板生产在厚度、板形质量控制中的迫切难题进行了有效解决，一定程度上突破了长期困扰的高端钛合金板带产品质量瓶颈，积极推动了我国钛产业技术进步，具有重要的科学意义与推广价值。