Building method of circular tube tee joint

The invention provides a building method of a circular tube tee joint. The method includes the steps of firstly, setting the three directions of the tee joint, a tee joint central point SC and the section central point S1, S2 and S3 of the tee joint, and calculating the central axis SCO of the circular tube tee joint; secondly, respectively calculating the regular polygon apex point, namely section feature point, used for fitting a section circle in each direction and the normal line of the feature point according to the central axis SCO and the three directions of the tee joint; thirdly, calculating the intersection point, namely the connecting point of the tee joint, of three tube sections, and calculating the normal line of the connecting point; fourthly, assembling a tee joint model according to the calculated section feature points and the connecting point. By the building method, the vivid, visual and reasonable tee joint model can be built, fast and effective modeling of the circular tube tee joint is