Calculation method of real-time cutting force coefficient considering dynamic chip thickness under tool vibration
A technology for chip thickness and coefficient calculation, which is applied in design optimization/simulation, electrical digital data processing, special data processing applications, etc. It can solve problems such as poor practicability, and achieve the effect of good practicability and improved utilization efficiency.
Active Publication Date: 2021-01-05
NORTHWESTERN POLYTECHNICAL UNIV
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[0003] In order to overcome the shortcomings of poor practicability of the existing cutting force coefficient calculation methods, the present invention provides a real-time cutting force coefficient calculation method considering the dynamic chip thickness under tool vibration
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[0023] refer to figure 1 . The present invention considers the real-time cutting force coefficient calculation method of dynamic chip thickness under tool vibration. The specific steps are as follows:
[0024] 1. Determine the tool geometry and dynamic parameters.
[0025] The geometric parameters of the tool are provided by the tool manufacturer or obtained through tool measurement. In the process of establishing the system dynamics model, the end of the tool is regarded as a two-degree-of-freedom spring oscillator model, and the modal stiffness, damping and modal mass parameters of the bottom end of the tool installed on the spindle chuck are measured by hammering experiments. The dynamic equation of the system is thus determined:
[0026]
[0027] Among them, m x 、m y are the modal masses in the x and y directions, respectively, c x 、c y are the modal damping in the x and y directions, respectively, k x 、k y are the modal stiffnesses in the x and y directions, r...
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The invention discloses a method for calculating a real-time cutting force coefficient by considering a dynamic chip thickness under vibration of a cutter, and aims to solve the technical problem of poor practicality of an existing cutting force coefficient calculation method. According to the technical scheme, the method comprises the steps of firstly measuring system stiffness through a hammering experiment; recording cutting force of a machining process in the workpiece cutting machining process; according to a kinetic equation, calculating vibration displacement of the cutter in real time;in combination with a time-lag effect, calculating the dynamic chip thickness; and finally establishing a relationship with actually measured cutting force according to a theoretical equation for calculating the cutting force in combination with the cutting force coefficient through the chip thickness, and solving a canonical equation to calculate an unknown cutting force coefficient. According to the method, cutting force data can be effectively utilized; a group of cutting force coefficients are calculated when the cutter rotates for a circle each time; the stiffness characteristic changesof different "spindle-chuck-cutter" systems are considered at the same time; the data utilization efficiency is improved; a large amount of the cutting force data is provided for later statistic processing to enrich a data basis of a cutting database; and the practicality is high.
Description
technical field [0001] The invention relates to a calculation method of cutting force coefficient, in particular to a real-time cutting force coefficient calculation method considering the dynamic chip thickness under tool vibration. Background technique [0002] The document "Cutting force coefficients determination using vibratory cutting, Procedia CIRP62(2017) 205-208." discloses a cutting force coefficient identification method considering dynamic chip thickness during cutting. For turning, which is a continuous cutting process, this method calculates the cutting force coefficient considering the impact of vibration caused by the weak rigidity of the cutting tool. Specifically, due to the weak rigidity of the tool in the turning process, the undeformed chip thickness of the cutting layer during the turning process will change dynamically due to the vibration of the tool. The method uses multi-sensors to measure the vibration of the tool, calculates the real-time dynamic...
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IPC IPC(8): G06F30/20G06F119/14
CPCG06F30/17G06F30/20
Inventor 张定华姚琦罗明吴宝海
Owner NORTHWESTERN POLYTECHNICAL UNIV