Micro-milling-force modeling method based on tool abrasion effect

Abstract

The invention relates to a micro-milling-force modeling method based on a tool abrasion effect and belongs to the field of precision and efficient machining of micro-parts. The method comprises the steps that the influence of tool tooth top trochoid motion trail, radial run-out of tooth tops, elastic recovery of machined surfaces and other factors is comprehensively considered to obtain a micro-milling-force prediction model which is not based on tool abrasion; then, the tool abrasion situation in the micro-milling process is obtained based on a finite element method, and the positive pressure and tangential friction force produced due to the fact that tool abrasion causes that the rear tool surface extrudes a workpiece are calculated based on a simulation result; finally, models of the two forces are superposed to obtain the micro-milling-force modeling method based on tool abrasion. The micro-milling-force modeling method achieves accurate micro-milling-force prediction through one model, improves the model robustness, is wide in application range and improves the micro-milling machining quality and efficiency of the micro-parts.

Description

technical field [0001] The invention belongs to the field of precision and high-efficiency machining of tiny parts, in particular to a micro-milling force modeling method based on tool wear effects. Background technique [0002] It is of great significance to study the micro-milling technology of tiny parts to improve its machining accuracy and efficiency. In the micro-milling process, the micro-milling force is an important process physical parameter, and the study of the micro-milling force modeling method has an important guiding role in optimizing the micro-milling process of tiny parts and improving the processing quality. [0003] At present, the modeling methods of micro-milling force mainly include mechanical analysis method, finite element simulation method and intelligent algorithm modeling method. The mechanical analysis method considers the influence of factors such as tool parameters, workpiece material yield strength and cutting conditions, but the assumptions...

AI Technical Summary

Problems solved by technology

The mechanical analysis method takes into account the influence of factors such as tool parameters, workpiece material yield strength, and cutting conditions, but the assumptions and simplifications made in the modeling process will reduce the prediction accuracy and complicate the modeling process

The finite element simulation method saves cost and can comprehensively consider the influence of tool and workpiece material, but the calculation cost is high and the prediction accuracy is poor

The intelligent algorithm modeling method requires a large number of test samples, and cannot consider the actual machining process, resulting in low prediction accuracy of micro-milling force

Although there are many micro-milling force modeling methods, there is a lack of micro-milling force prediction models based on the impact of tool wear

[0004] The paper "Three-dimensional dynamic cutting forcesprediction model during micro-milling nickel-based superalloy. International Journal of Advanced Manufacturing Technology, 2015, 81:2067-2086." published by Lu Xiaohong et al. proposed a three-dimensional dynamic cutting force prediction model during micro-milling method, considering the influence of tool geometry, workpiece material, radial runout and other factors; however, this method does not consider the effect of tool wear, and there is a certain error between the prediction results and the test results

The paper "Influence of tool wear on machining forces and tool reflections during micro milling. International Journal of Advanced Manufacturing Technology, 2016, 84(9): 1963-1980" published by OliaeiSNB et al. studied the influence of tool wear on the force process of micro milling based on experiments. , but based on the poor universality of the test method, the prediction results will no longer be applicable after changing the workpiece material

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