Design Of Laser Ball Bar And Research On Adjustment Method Of Telescopic Guide

With the development of intelligent manufacturing,industrial robots,which is the main force of intelligent manufacturing will face unprecedented opportunities for development.At present,industrial robots have the ability to replace human beings in simple production line operation and assembly,but they fail to meet the requirements of precision operation.The position accuracy of industrial robots is mainly measured by laser tracker,However,laser trackers are expensive in the market,which can not meet the development needs of domestic industrial robots.Therefore,it is proposed that a spatial motion error measuring device with simple structure,short development cycle and low cost will be of great significance for improving the motion precision of industrial robots.This paper proposes a laser ball bar instrument(also known as 3D laser ball bar instrument)for measuring spatial motion error based on the spherical coordinate principle.The device is composed of two parts,one is a mutually orthogonal turntable and the other is a telescopic mechanism which is orthogonal to the horizontal axis through the intersection of two rotating axes.In this paper,a precise two-dimensional turntable and a telescopic mechanism are combined to realize its spatial motion function.In order to realize the space motion function of the equipment,the method is adopted of combining precision two-dimensional turntable with telescopic mechanism.On the other hand,in order to realize the space position measurement function,laser interferometer and circular grating are used to measure the radial distance and rotation angle of the rotating axis respectively.As one of the main moving parts of 3D laser ball bar,assembly error and stress deformation will seriously affect the kinematic accuracy of the telescopic mechanism in cantilever state,which will seriously affect the rotation angle of two rotating axes,and then affect the accuracy of 3D laser ball bar.In order to reduce the influence of force deformation and assembly error on the kinematic accuracy of telescopic mechanism,a high precision telescopic guideway is developed in this paper.The telescopic guide is based on the guide rail and slider motion unit.Its basic motion function is realized by stacking and mounting.The deformation of the telescopic guideway in cantilever state is reduced by designing the structure of the telescopic guideway.According to the measuring principle of straightness and parallelism of guideway,this paper presents a method for adjusting and measuring the motion accuracy of telescopic guideway.This method realizes the measurement of the angle between the motion axes of two slider units of telescopic guideway.The angle measurement value can be used to guide the adjustment of the motion accuracy of telescopic guideway.According to the above adjusting methods,when the slider moves along the upper rail,the X-direction and Y-direction motion errors are reduced from 44 ?m and 439 ?m to 20 ?m and 14 ?m,respectively;When the slider moves along the lower rail,the X-direction and Y-direction motion errors are reduced from 45 ?m and 158 ?m to 25 ?m and 37 ?m,respectively;The X- and Y-direction motion errors of the telescopic guideway are reduced from 105 ?m and 281 ?m to 47 ?m and 48 ?m,respectively.The above results show that the motion error of the telescopic guide rail is significantly reduced,and the adjustment and measurement methods are reliable.