Machine tool assembling joint surface design method capable of taking deformation error compensation as target

Abstract

The invention discloses a machine tool assembling joint surface design method capable of taking deformation error compensation as a target. The method comprises the following steps: in CAD (Computer Aided Design) software, according to statics analysis requirements and the structural characteristics of a machine tool, carrying out structure simplification; then, carrying out parameterized assembling on a machine tool entity model; importing the entity model subjected to the simplification and the parameterized assembling into finite element analysis software Ansys Workbench; creating a container capable of carrying out automatic analysis and extraction deformation by utilizing the software, carrying out orthogonalization of a processing spatial position and mesh generation, and meanwhile, finishing statics analysis and result storage; then, through data learning, obtaining the practical deformation amount of a machine tool assembling nominal joint surface under a situation that whole processing space deformation is considered; flipping the obtained practical deformation amount, adding the flipped amount and the nominal joint surface to serve as an actively designed machine tool assembling joint surface; and on the basis of a Monte Carlo method and a least square method, finishing profile tolerance design of the assembling joint surface with the combination of a data regression technology.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing and design, and relates to a data learning-based method for designing a joint surface of a machine tool assembly, including Workbench automatic analysis and extraction deformation technology, joint surface active design technology and joint surface profile tolerance design technology, and specifically relates to a A design method for the joint surface of machine tool assembly aiming at offsetting the deformation error. Background technique [0002] Under the action of cutting force, clamping force, gravity and inertial force, CNC machine tools will produce obvious additional geometric deformation, thereby destroying the original mutual positional relationship of each component of the machine tool and generating additional processing errors, which is called deformation (force) error. Studies have pointed out that deformation errors account for 12% of all machine tool errors, and are the thi...

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Problems solved by technology

[0003] It is an important means for machine tool manufacturers to counteract the damage to machining accuracy caused by geometric deformation by scraping and grinding the assembly joint surface. Rely on experience, lack of scientific and reasonable quantitative technical solutions

Essentially, there is a lack of a design method for the contour shape of the part considering the deformation of the part

[0004] In one of the few studies on the active design of the joint surface of the machine tool, Sun et al. of Dalian University of Technology used a multi-form fitting method to carry out a "pre-deformation" design on the joint surface of the guide rail to offset the error caused by the plastic deformation of the feed system. However, there is no active design of the assembly joint surface from the perspective of the whole machine tool; at the same time, this method is aimed at the sliding joint surface of the machine tool, and is not applicable to the fixed joint surface of the machine tool; and the polynomial fitting method is only suitable for building two-dimensional contours, for common machine tools 3D assembly interface profile is not feasible

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