基于成形磨削的大模数风电齿轮磨削极限位置的获取方法

Determination of Extreme Points in the Profile Grinding Process Based on Form Grinding in the Wind Power Generating Field

作为较有潜力的能源之一,风力发电的应用越来越广泛。作为风力发电系统的关键核心装备,齿轮箱质量的好坏直接决定了整套风力发电装备的使役性能。作为齿轮箱的典型零件,齿轮的表面精度是决定齿轮箱质量的关键因素之一。风电齿轮一般采用滚齿作为粗加工与成形磨齿作为精加工的方式获得。成形磨削过程中,磨削极限位置的获取对于了解磨削过程、优化磨削参数以及消除加工缺陷至关重要。提出了一种获取极限磨削位置的方法。根据滚齿加工展成法的基本原理,获取滚齿形成的齿形曲线;以成形磨削为基础,在不同进给余量的前提下,建立极限磨削位置的数学模型,并利用合适的数值迭代算法获取了该位置;以某典型风电斜齿轮为例,说明了所提方法的正确性和有效性。

As one of the most important types of energy, wind power generated electricity is used more and more commonly. For the system of wind power generated electricity, gear box is a key assembly and directly determines its performance. The surface accuracy of gears is one of the key factors which influence the gear box′s property. Nowadays, blanks of wind power generating gears are often derived by hobbing and the finishing process is completed using the profile grinding method. In this process, extreme grinding points are very important for studying grinding process, optimizing grinding parameters and eliminating machining deficiencies. Therefore,a new method to determine extreme grinding points is proposed. Based on the meshing principle, surfaces of gear teeth are obtained. Using the profile grinding method, the model for determining extreme grinding points is developed and an iterative way is used to get the points. One example using typical wind power generating gears is carried out to illustrate the correctness and validity of the proposed method.