Free-form surface micro-milling cutting force modeling method

Abstract

The invention discloses a free-form surface micro-milling cutting force modeling method. The free-form surface micro-milling cutting force modeling method comprises the following steps of (1) obtaining machining parameters including the radius R of a cutter, a helix angle beta of the cutter, the number Nf of cutting edges, the feed amount ft of each tooth, an eccentric distance p of the cutter and the initial eccentric angle alpha of the cutter, (2) dispersing the cutting edges of the cutter in the axial direction to form a series of cutting micro-elements and obtaining cutting micro-elements involved with cutting, (3) calculating the instantaneous cutting thickness of the cutting micro-element P (k, phi) with an axial angle phi of the current cutting edge, (4) calculating the cutting force of the micro-element P (k, phi) and (5) calculating the sum of the parameters obtained in the steps (3) and (4) and the cutting forces of the micro-elements involved with cutting to obtain the cutting force of the cutter. By means of the free-form surface micro-milling cutting force modeling method, the micro-milling cutting force of a free-form surface can be efficiently and accurately predicted.

Description

Technical field [0001] The invention belongs to the technical field of micro-milling processing, and more specifically, relates to a free-form surface micro-milling cutting force modeling method. Background technique [0002] Prediction of micro-milling force is the basis of micro-milling machining accuracy control, surface integrity and other related research, and it occupies an important position in related research in the field of micro-milling. At present, the research on the cutting force of conventional milling is relatively mature. Although the related research of micro-milling can be used for reference, there is still a big difference between the two. [0003] In the field of conventional milling, the tool and spindle can withstand large cutting forces, the feed per tooth is large (usually much larger than the cutting edge radius of the tool), and the milling force is almost all shearing force; while in micro milling , The cutting force of the tool and the spindle is relat...

AI Technical Summary

Problems solved by technology

Second, in the field of cutting force modeling for free-form surface micro-milling, only a few scholars have established mechanical force models and finite element models. It is necessary to calibrate the cutting force coefficients through a large number of cutting experiments or finite element simulations, which is time-consuming and expensive. And the model accuracy is not high

Third, the existing cutting force models rarely consider both tool eccentricity and tool deformation in the process of calculating the instantaneous cutting thickness, resulting in inaccurate calculation of the instantaneous cutting thickness

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