Computer Aided Tolerance Analysis Of Complex Dimension Chain

Research content is to choose three typical organization,to build complex dimension chain,respectively,using the tolerance analysis software based on CATIA CETOL6 sigma,in a three-dimensional solid model of three dimensional tolerance model is established on the basis of analysis of calculated results,the dimension chain theory algorithm and software,comparing the calculated results based on the evaluation results are optimized,and the software is used to calculate results analyzed the contribution of each component loop in dimension chain and sensitivity.The main contents are as follows:1)mainly colter speed change gear box as an example,the four mounting holes in the plane of the casing installation location precision of the proposed three kinds of different annotation methods,and use the tolerance analysis software based on CATIA CETOL6 sigma establishing the model of three dimensional tolerance analysis of three kinds of tagging method respectively,using the size precision of control group position accuracy of holes will cause the accumulated error,using position and implement the maximum entity control the location accuracy of group holes can ensure the interchangeability of parts,expand the position degrees of tolerance,improve the qualified rate,reduce cost and guidance for the design of the product.2)carried out on a slider-crank mechanism kinematics and dynamics of theoretical analysis,established the CETOL assembly dimension chain and tolerance analysis software,the assembling deviation of slider-crank mechanism of slide block is analyzed,and the analysis results of sensitivity and contribution is discussed.,according to the extreme value method and statistical analysis of the slider A surface and the distance between the bracket B side are within the scope of the design,also said that the results of the theoretical calculation values in the CETOL distribution range,and it is concluded that under ideal condition,the trajectory deviation of slider-crank mechanism size for the conclusion of + 0.285 mm ~ 0.285 mm.3)PF4-CFT is simplified three-dimensional model,respectively from the T direction and Z direction two aspects analyzes the superconducting busbar may occur in the process of installation error,the dimension chain established T direction and Z direction and the tolerance model was established based on tolerance analysis software,the position of the groove in the Z direction changes lead to the diaphragm Angle is greater than the clearance variation caused by the plate at a maximum distance of the Z axis direction of translation can be up to 4.1 mm,because of the superconducting busbaris installed on the support plate,if you want to ensure that installation,it must be the superconducting busbar and support this gasket on support plate is taken to ensure the installation.And due to the location of the mounting holes in the T direction changes will be directly related to the installation of the superconducting busbar,and the location of the mounting hole and the groove bottom of the distance chain.