Cutting tool mode parameter uncertain curve five-shaft numerical control process parameter optimizing method

Abstract

The invention provides a method for optimizing uncertain curve-surface five-axis numerical control process parameter of the cutter modal parameters, belonging to the technical field of computer numerical control machining. The method for optimizing the machining process parameter comprises the steps as follows: firstly, the uncertain area of the cutter system modal parameter is obtained; a five-axis milling machining dynamic model is established; the input parameter of the model comprises a cutter system modal parameter area, a cutting force coefficient, a cutter geometry and a cutter path; the five-axis milling machining vibration stabilization curve is calculated; and by taking the five-axis milling machining vibration stabilization curve as a constraint, the process parameter optimization model is established and worked out by a sequence nonlinear planning method so as to obtain the optimized process parameter. As the invention considers the uncertainty of the cutter system modal parameter and is closer to the real machining condition, thus improving the exactness of the vibration prediction during the machining.

Description

technical field [0001] The invention relates to a method for optimizing process parameters of five-axis numerical control machining of curved surfaces, in particular to a method for optimizing process parameters of five-axis numerical control machining of curved surfaces in space considering the uncertain modal parameters of tool systems controlled by a computer. The invention belongs to the technical field of computer numerical control processing. Background technique [0002] During the five-axis machining process of aero-engine impellers, blade-like spatial surfaces, and mold-like difficult-to-machine materials, the machining accuracy of parts, surface quality of parts, and tool wear all depend on the reasonable selection of processing parameters. In order to meet the needs of high-efficiency and precision machining of parts, it is necessary to first ensure the stability of the machining process (no chatter), and then select optimized process parameters to achieve high ef...

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Problems solved by technology

[0003] The optimization of existing five-axis milling process parameters is based on the dynamic model of five-axis milling with certain parameters (Budak, E., Tekeli, A.2005.Maximizing chatter free material removal rate inmilling through optimal selection of axial and radial depth of cut pairs, CIRP Annals-Manufacturing Technology 54(1): 353-356), using the determined tool system modal parameters and cutting force coefficients to obtain the chatter stability curve, and using this curve as a constraint condition to optimize the solution and finally get the optimized process parameters, but this method does not introduce the uncertainty of the modal parameters of the tool system into the process parameter planning, and cannot reflect the real processing conditions, so the obtained process parameters are not the real optimal solution, which may lead to chatter. Precise and efficient machining of parts cannot be achieved

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