Modeling method for swing angle milling head complete machine based on block modeling and experimental parameter identification

Abstract

The invention discloses a modeling method for a swing angle milling head complete machine based on block modeling and experimental parameter identification, and belongs to the technical field of modeling. According to the method, module division is determined according to the structure and junction surface distribution of a swing head, non-consolidation connection structures such as junction surfaces and bearings are used as boundaries among modules, an equivalent kinetic model is established, and a kinetic equation is solved. Then, a machine tool is split according to the divided modules, excitation experiments are conducted on the modules respectively, frequency response functions are collected, finite element models of corresponding modules are established, and joint surface parameterscapable of minimizing errors between theoretical values and measured values of the frequency response functions are searched through an optimization algorithm; The searched joint surface parameters are added to the finite element model of each module. The finite element models of all the modules are integrated into a model of the swing head complete machine, solving a tail end frequency response function ,the tail end frequency response function is compared with an actually measured frequency response function, and the reliability of the model and the feasibility of the modeling method.

Description

technical field [0001] The invention belongs to the technical field of modeling, and in particular relates to a modeling method for a complete machine of an oscillating angle milling head for block modeling and experimental parameter identification. Background technique [0002] The oscillating milling head (referred to as: oscillating head) is the core component of the multi-axis linkage CNC machine tool. The internal structure of the oscillating milling head is complex, the load conditions are diverse, and there are multiple motion poses, which brings great challenges to the research and design work. It is very difficult, but because the precision of the oscillating milling head basically directly determines the precision of the machining, it is also an unavoidable research focus. Effective and accurate modeling of the whole machine tool is of great significance to the characteristics research and structural optimization of the machine tool. However, due to the complex str...

AI Technical Summary

Problems solved by technology

[0004] Regarding the direction of finite element machine modeling, there are still three problems in general: (1) Basic research is not enough: foreign research on modeling is based on a large number of related experiments, and the setting of important parameters For example, bearing stiffness, joint surface stiffness, etc. are all supported by a large amount of data, while domestic research is purely based on experience or directly using parameters provided by manufacturers, and has not been able to carry out accurate identification.

(2) The accuracy of the model is low: In order to reduce the calculation load of the simulation and save the computer's performance, the finite element simulation must simplify the model through some simplification methods (bonding of the joint surface, simplification of the bearing, simplification of the mechanism), but these methods Most of them are too ideal, and it is difficult to verify the impact on the model, and the final simulation results lack experimental verification

(3) Insufficient research on dynamic characteristics. Due to the limitation of finite element software functions and the inadequacy of modeling theory methods, the modeling research on the dynamic characteristics of machine tools is still at a relatively shallow stage. The setting of conditions does not have a convincing quantitative standard

Images