A Stability Prediction Method Considering Multi-modal Vibration and Workpiece Machining Response
A stability prediction, multi-modal technology, applied in the field of metal cutting in machining, which can solve the problems of scrapped workpieces, inability to accurately predict machining status, and threats to workpiece machining quality.
Inactive Publication Date: 2021-03-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
The static stability diagram using the traditional single factor cannot accurately predict the machining state, let alone obtain the real-time frequency response during the machining process of the workpiece, which introduces a large number of unknown factors into the machining process, especially for the prediction of the milling stability of the weak rigidity system. It poses a serious threat to the processing quality of the workpiece, and it is very easy for the processing result to fail to meet the actual requirements, and even the workpiece is scrapped.
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[0127] like figure 1 As shown, the material of the workpiece 1 in this embodiment is Al7075, the geometric parameters are 100mm long, 60mm high, 4mm thick, and the density is 2770kg / m 3 , Young's modulus is 71GPa, Poisson's ratio is 0.33, the height of workpiece 1 clamped by the first fixture 7-1 and the second fixture 7-2 is 20mm, the modal parameters of the tool 10 are shown in Table 1, the tool 10 The number of teeth is 4, the helix angle is 30°, and the finite element analysis values of workpiece 1 are shown in Table 2. When the mode shape U of tool 10 and workpiece 1 t and U w When more than one node is needed, it is obtained by interpolation.
[0128] Table 1
[0129]
[0130] Table 2
[0131]
[0132] Before plotting the stability lobe diagram, the cutting force coefficient was calibrated by slot milling, and the feed rate per tooth was from 0.04 mm to 0.20 mm in increments of 0.04 mm. The tangential cutting coefficient is obtained as K t =8.9×10 8 Mpa, ...
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The invention relates to the field of metal cutting in mechanical processing, in particular to a stability prediction method considering multi-order modal vibration of tool-workpiece and real-time processing frequency response of workpiece. The processing measuring system of the present invention comprises workpiece, force hammer, capacitive sensor, damping bar, magnetic meter stand, first fixture, second fixture, charge amplifier, PC machine and cutting tool; Described first fixture and second fixture are arranged on The lower end of the workpiece, the first fixture and the second fixture are provided with scales, the capacitive sensor is arranged on the damping rod, and the damping rod is arranged on the magnetic table base; the present invention has constructed a tool-workpiece four-degree-of-freedom milling The model also takes into account the hysteresis effect of the tool helix angle, and based on this, introduces a process damping model that is convenient for calculating the intrusion volume. The invention uses the equivalent triangular cross-sectional area to quickly determine the process damping, and further improves the accuracy of stability boundary prediction.
Description
technical field [0001] The invention relates to the field of metal cutting in mechanical processing, in particular to a stability prediction method considering tool-workpiece multi-order modal vibration and real-time processing frequency response of the workpiece. Background technique [0002] Due to the increasing popularity of lightweight design, thin-walled workpieces have been widely used in aerospace, communication and other fields. Thin-walled workpieces are characterized by complex geometric topology and poor rigidity, which bring great challenges to milling. The cutting process involves the cooperation of machine tools, milling cutters, workpieces and fixtures. It is of great significance to maximize the performance of machine tools, improve processing efficiency, and make the whole process stable and controllable. The internationally renowned journal "Journal of Manufacturing Science and Engineering" published "Discrete-Time Prediction of ChatterStability, Cutting ...
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IPC IPC(8): G06F30/23
Inventor 王西彬王东前焦黎刘志兵黄涛王永刘书尧籍永建
Owner BEIJING INSTITUTE OF TECHNOLOGYGY