Improvement method of milling stability of thin-walled parts based on prestressing
A thin-walled, prestressed technology, applied in special data processing applications, instruments, design optimization/simulation, etc., can solve problems such as poor practicability, achieve good practicability and improve milling stability.
Active Publication Date: 2019-04-16
NORTHWESTERN POLYTECHNICAL UNIV +1
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[0005] In order to overcome the shortcomings of poor practicability of the existing method for improving the milling stability of thin-walled parts, the present invention provides a method for improving the milling stability of thin-walled parts based on prestressing
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[0025] refer to Figure 1-7 . The size of the thin plate selected in this embodiment is 145mm×60mm×4mm, the material is aluminum alloy 7075, the Young’s modulus is E=71Gpa, and the density is ρ=2810kg / m 3 , Poisson’s ratio is υ=0.33, the boundary condition is that two opposite sides are fixed and two opposite sides are free; the number of teeth is selected as N=4 teeth, the diameter is D=12mm, the helix angle is β=30°, and the normal front angle is α n =10°, a flat-bottomed carbide end mill with a clearance angle of γ=5°; in a three-coordinate vertical machining center, the radial depth of cut is a e =0.6mm, the feed per tooth is milled in the down milling mode of c=0.05mm / tooth.
[0026] The specific steps of the method for improving the milling stability of thin-walled parts based on the application of prestress in the present invention are as follows:
[0027] Step 1. Clamp the selected tool to the spindle of the machine tool with a fixed overhang, clamp the workpiece to...
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The invention discloses a milling stability improvement method of a thin-walled part based on action of prestressing force, to solve the technical problem of poor practicability of the existing thin-walled part milling stability improvement method. Firstly, the modal parameters of the tool and the workpiece are obtained by modal hammering experiment, and the order of modal usage is determined. Then the stability lobe diagram of the thin-walled part is calculated by time domain method, and the optimal rotational speed is selected. Then the natural frequencies of a series of prestressed thin-walled parts are calculated by the finite element method, and the relationship between the natural frequencies and the prestressing force is obtained by curve fitting. Finally, through choose of the target axial limit depth corresponding to the optimization speed as the optimization objective, the natural frequency is scanned until the axial limit depth reaches the target value at the speed, and therequired prestressing force value is output. On the premise of not interfering with the tool path, the method improves the milling stability of the thin-walled parts by applying corresponding magnitude of prestressing force, and has good practicability.
Description
technical field [0001] The invention relates to a method for improving the milling stability of thin-walled parts, in particular to a method for improving the milling stability of thin-walled parts based on prestressing. Background technique [0002] Due to its poor rigidity, thin-walled parts are prone to flutter during milling, resulting in insufficient machining accuracy and large surface roughness. In severe cases, it will damage the workpiece, tool, and even the spindle of the machine tool. The cutting parameters can be reasonably selected to avoid the machining chatter region through the drawing of the stability lobe diagram, but this method belongs to passive vibration avoidance, which often cannot achieve the expected assumption and give full play to the best performance of the machine tool. Therefore, it is of great theoretical significance and practical application value to develop methods to improve the milling stability of thin-walled parts. [0003] The documen...
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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 张卫红吴志鹏万敏高挺岐张新娟
Owner NORTHWESTERN POLYTECHNICAL UNIV