Unfolding lofting method for large-size non-standard static equipment with tangential connecting pipes

Abstract

Provided is an unfolding lofting method for large-size non-standard static equipment with tangential connecting pipes. The non-standard static equipment comprises an equipment body and the connecting pipes in tangential connection with the equipment body, wherein the outer walls of the connecting pipes are connected with the outer walls of tangential open holes of the equipment body, and the inner walls of the connecting pipes are connected with the inner walls of the tangential open holes of the equipment body. The method comprises the steps that a three-dimensional diagram of the non-standard static equipment at 1:1 scale is drawn by using commands of AutoCAD and is decomposed into the equipment body and the connecting pipes, at least the end face lines of the equipment body, the intersecting lines of the inner walls and the outer walls of the connecting pipes at the combined positions of the connecting pipes and the equipment body, the intersecting lines of the open holes of the inner wall and the outer wall of the equipment body and the end face circles of the connecting pipes are obtained, the end face circles of the connecting pipes are divided into multiple equal parts, generatrices are drawn with the end face lines and the equal division points of the end face circles as starting points and the intersecting lines as end points, tessellation lines formed by the generatrices of the equipment body and the connecting pipes intersect on the intersecting lines of the equipment body and the connecting pipes respectively, point selection is carried out on the tessellation lines in sequence, and the length of the line segments of lofting is obtained, and the line segments used for the lofting are drawn on the same plane in sequence. According to the method, the intersecting lines are directly obtained through the function of the AutoCAD, and thus the method improves the lofting efficiency and is simple and reliable.

Description

technical field [0001] The invention relates to an unfolding sample opening method, in particular to an unfolding sample opening method for large non-standard static equipment with a tangential connection. Background technique [0002] In actual engineering, we often encounter some complex structural nodes and various structural shapes, and it is very difficult to draw the joint lines (space curves) between them. For a long time, traditional methods have been used to magnify samples. Expanding samples is a highly professional skill, which requires the operator to have basic knowledge of geometry, spatial imagination and rich practical experience. On the basis of geometric knowledge, the unfolding method studies the projection relationship of points, lines and surfaces. Using a series of techniques such as projection method, rotation method, ray method, section method, and surface-changing method to obtain the real length of the space line segment, so as to achieve the purpo...

AI Technical Summary

Problems solved by technology

Moreover, a component has to be calculated many times. Due to the complicated method and many lines, once the control of size error and point error is wrong, it will affect all subsequent work.

The inspection of the stakeout process is also very difficult

Cause low work efficiency and low machining accuracy

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