A cross-axis and cross-point modal test and parameter identification method for cutting stability prediction
A modal test and parameter identification technology, applied in simulators, program control, instruments, etc., can solve problems such as the distortion of the stability lobe diagram, ignoring the dynamic characteristics of the cutting system, and failing to meet the accuracy requirements of the system dynamic model. To achieve the effect of improving the accuracy
Active Publication Date: 2019-10-11
DALIAN UNIV OF TECH
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The common feature of the above-mentioned documents and patents is that they all assume that the dynamic behavior of the cutting system occurs at the point of the tool tip, which ignores the dynamic characteristics of the cutting system along the axial direction of the tool. The accuracy requirements of the system dynamics model cannot be met, resulting in a certain degree of distortion in the predicted stability lobe diagram in certain speed ranges
Document 3 "C.Eksioglu, Z.M.Kilic, Y.Altintas, Discrete-Time Prediction of Chatter Stability, Cutting Forces, and Surface Location Errors in FlexibleMilling Systems, Journal of Manufacturing Science and Engineering.134(2012) 61006." gives a The dynamic model of the multi-point contact between the tool and the workpiece is characterized by: figure 1 As shown in (a), the acceleration sensor is installed at the tip of the tool, and the measurement direction is guaranteed to be always parallel to the striking direction, but the hammer strike is not only performed at the tip of the tool (node 1), but also along the axis of the tool in sequence multiple nodes (e.g. node 2, ..., node q), although this method considers the dynamics of the cutting system's cross-point coupling along the tool axis, it ignores the influence of the system's cross-axis modal coupling
At present, the relevant literature and patents do not consider the dynamic characteristics of the cross-axis coupling and cross-point coupling of the cutting system at the same time; and it is foreseeable that the percussion test that simultaneously considers the cross-axis and cross-point coupling also involves new system transfer function processing and dynamics. The problem of parameter identification
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[0022] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and technical solutions. like figure 1 As shown in (a) and 1(b), this method first installs a miniature three-axis acceleration sensor on the tool tip, and uses a force hammer to move along two horizontal and orthogonal directions ( X-direction and Y-direction) for cross-axis and cross-point modal knocking experiments. The measured transfer functions are grouped according to different measurement axes, and the dynamic parameters (modal mass, damping, stiffness and formation) are identified for each group of transfer functions. Then, the meshing part between the tool and the workpiece under the given axial depth of cut is divided into multiple cutting layer elements along the tool axis, and the modal formation values identified at the above nodes are assigned to each layer of elements by linear interpolation. And together with other dyn...
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The invention provides a cross-axis and cross-point modal test and parameter identification method for cutting stability prediction, which is used to improve the accuracy of the existing cutting stability prediction method. Firstly, a three-axis acceleration sensor is installed at the cutter tip, cross-axis and cross-point modal knocking is carried out along two horizontal orthogonal directions atmultiple preset nodes on the cutter axis through a force hammer, measured transfer functions are grouped according to different measuring axes, and the dynamic parameters of each transfer function are identified. Secondly, the meshing part between the cutter and the work piece is divided into multiple cutting layer elements along the cutter axis under given axial cutting depth, the modal array values identified at the nodes are allocated by linear interpolation to the elements in all the layers, and a parameter matrix matching a dynamic model is assembled based on the modal array values and other dynamic parameters. Finally, a dynamic parameter matrix including the cross-axle and cross-point modal coupling effect is obtained. In the method, the acceleration sensor only needs to be installed once.
Description
technical field [0001] The invention relates to a modal test and parameter identification method oriented to cutting stability prediction, in particular to a cross-axis and cross-point modal test and parameter identification method oriented to cutting stability prediction. Background technique [0002] Predicting the stability of the cutting process is conducive to improving the processing quality of parts, increasing the material removal rate, slowing down tool wear, and avoiding damage to the machine tool spindle due to severe vibration. It has gradually become an important consideration for automated and intelligent processing. At present, the stability prediction of the cutting process is usually achieved by drawing the stability lobe diagram, that is, the processing parameter domain is divided into three different categories of stability, chatter and critical stability through the calculated stability lobe. combination. On this basis, further design of chatter suppress...
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IPC IPC(8): G05B19/408
Inventor 孙玉文姜尚磊
Owner DALIAN UNIV OF TECH