Design method for arching curve of vertical guide rail surface of super-span beam of heavy-duty gantry machine tool

Abstract

The invention relates to the field of heavy gantry machine tool manufacturing, in particular to a method for designing an arching curve on a vertical guide surface of a super-span crossbeam of a heavy gantry machine tool. Via optimizing the arching curve on the guide surface, the problem that the vertical guide surface of a large-span crossbeam is large in linearity error and angle error under the action of gravity load is solved. Due to the fact that contact surfaces of a slide carriage with the guide surface of the crossbeam are divided into a left contact surface and a right contact surface so as to generate a left deformation curve and a right deformation curves, and by taking full advantages of the fact, arching value of the arching curve and deformation values of the left and the right deformation curves are integrally taken into consideration to establish a model for optimizing the linearity and cornering error, the arching curve is optimized via the multiple target genetic algorithm, and effect is optimized to meet the national standard.

Description

technical field [0001] The invention relates to the field of manufacturing heavy-duty gantry machine tools, and more particularly relates to the design of the arching curve for reverse deformation processing of the beam of such machine tools. Background technique [0002] Heavy-duty CNC gantry machine tool ( figure 1 ) is a relatively economical machine tool in modern large-scale workpiece processing equipment. It has the characteristics of large processing span and high processing efficiency. It can usually realize contour milling surface processing and obtain high processing accuracy. figure 1 The CNC heavy-duty gantry milling machine shown is composed of bed, sliding seat, column, beam, slide plate and ram. The slide plate moves on the beam to complete the y-direction feed, and the slide seat drives the whole machine tool to move on the bed to complete the x-direction feed; the ram moves up and down on the slide plate to complete the z-direction feed. [0003] The machi...

AI Technical Summary

Problems solved by technology

The arching method currently proposed is mainly to invert the mean value of the left and right deformation values ​​of the contact between the slide plate and the beam as the current arching deformation value. Although the arching curve of the vertical guide rail surface of the beam can be obtained by this method, part of the error effect can be eliminated. However, due to the different deformation values ​​of the left and right contact surfaces of the sliding plate, the optimality of the camber value of the machine tool cannot be guaranteed, and the straightness error and rotation angle error of the machine tool at each position of the beam can not be guaranteed to meet the machine tool accuracy standards.

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