A non-uniform allowance allocation method based on interim state stiffness of machining features for NC programming of structural parts

Abstract

For thin-walled parts, uniform allowance to each machining surface is allocated by the traditional machining method. Considering the sequence of the adjacent machining features, it may cause poor stiffness for some side walls due to a minor wall thickness, which may cause the deformation of the final formed parts to be large, or deduce machining efficiency for some machining features due to too thick remains. In order to address this issue, a non-uniform allowance allocation method based on interim state stiffness of machining features for the finishing of thin-walled structural parts is proposed in this paper. In this method, the interim state model of machining features is constructed according to the machining sequence of the parts, and the stiffness of the side wall is taken as the evaluation index to allocate reasonable allowance value to the corresponding machining surface to ensure the stiffness requirement of the parts in the machining process. According to the finite element simulation results, the non-uniform allowance allocation method proposed in this paper can effectively improve the stiffness of the parts and reduce the deformation of the parts, when compared with the traditional uniform allowance machining method.

Analysis of Multi-Objective Optimization of Machining Allowance Distribution and Parameters for Energy Saving Strategy

“…The priorities of each phase can all be met by doing so. (2) This research further enhances the recommendation of relative larger setting of machining allowance of rough machining, and small setting of finishing machining, like [4,26]. (3) It is revealed that the high-speed cutting technique recommended by many previous studies, like [13,30], are not always suitable for application.…”

“…The value ranges of each sub-objective functions are listed in Table 15, and those can be used to calculate the normalized values by using Equation (26), and backwards as equal. Like the cylindrical turning, the number of the operation repeating time was set to be 100, namely n I = 100.…”

“…For the machining allowance analysis, Zhang et al [25] proposed a force-measuring-based approach for feed rate optimization considering the machining allowance. Jiang et al [26] proposed a non-uniform allowance allocation method for NC programming of structural parts.…”

Study of optimization of blade non-uniform allowance process and chatter stability domain

“…This contributes to maintaining high stability, high rigidity, and long lifespan in its operational environment. To achieve these objectives, Jiang et al [1] proposed a method for non-uniform allocation of finishing allowances in thin-walled structural component precision machining based on the transitional state stiffness of machining features. This method effectively enhances the component's stiffness and reduces deformation.…”

Reinforcement learning method for machining deformation control based on meta-invariant feature space

“…They developed a linear-programming optimization model to optimize the overall machining deformation. Jiang et al [ 15 ] proposed a nonuniform allowance allocation method based on the interim state stiffness of machining features. Their proposed method can effectively improve the stiffness of a part and hence, reduce its deformation.…”