Heavy double-column vertical lathe cross beam gravity deformation prediction method based on finite difference method

Abstract

The invention relates to a heavy double-column vertical lathe cross beam gravity deformation prediction method based on a finite difference method. Due to the fact that an existing finite element analysis computing method cannot accurately calculate a cross beam gravity deformation curve on the condition that actual materials have not uniform attributes, the calculation result much differs from an actual deformation value. The heavy double-column vertical lathe cross beam gravity deformation prediction method based on the finite difference method comprises the steps that actual assembling conditions are simulated to design a heavy machine tool cross beam self-weight deformation experiment to obtain a self-weight deformation curve. By means of the material mechanical theory, a cross beam is simplified into a simply supported beam mechanical model and then made into micro segments through discretization, and a cross beam gravity deformation discretization model is built on the basis of the finite difference method; the equivalent weight bending rigidity of each discrete micro segment is calculated; the cross beam finite element gravity deformation curve is calculated; the equivalent weight bending rigidity is utilized for correcting the cross beam finite element gravity deformation curve on the basis of the finite difference method to obtain a final cross beam gravity deformation curve. The heavy double-column vertical lathe cross beam gravity deformation prediction method is applied to heavy double-column vertical lath cross beam gravity deformation curve calculation.

Description

technical field [0001] The invention relates to a method for predicting the gravitational deformation of a beam of a heavy-duty double-column vertical vehicle based on a finite difference method. Background technique [0002] Heavy-duty CNC machine tools are widely used in key fields such as national defense, aerospace, energy, ships, and metallurgy as processing machines. The quality of their precision directly reflects the level of a country's manufacturing industry. Due to the structural factors such as large size and large span of the heavy-duty double-column vertical lathe itself, it will cause a certain degree of deformation under its own gravity, and the deformation error caused by the gravity cannot be ignored. [0003] The beam is the core component of the heavy-duty double-column vertical lathe, and the parallelism of the vertical tool holder movement to the worktable (G5 item accuracy) is its most important accuracy index. By compensating the anti-deformation cur...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing finite element analysis calculation method cannot accurately calculate the gravity deformation curve of the beam under the condition that the actual material properties are not uniform, resulting in a large difference between the calculation result and the actual deformation value. Prediction method of gravity deformation of heavy-duty double-column vertical car beam based on difference method

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