Method for opening concentric elliptical holes in multi-layer superimposed arc webs with different curvatures

Abstract

The invention relates to a concentric oval hole forming method of a multilayer overlapping different-curvature circular arc web plate. The method is characterized in that through lofting, the oval center point and the outline of a steel plate neutral layer are determined through mapping software; the oval center point and the outline after the mapping are converted to an outer skin of the steel plate, and patterns are artificially drawn; through programming software, a numerical control cutter is used for cutting; the goal of forming four-row nine-line gradually varied crossing angle concentric circle oval holes in the eight-layer different-curvature overlapping circular arc web plate can be achieved. Compared with the prior art, the concentric oval hole forming method has the beneficial effects that the hole forming positioning accuracy can be ensured; the appearance outline is accurate; the concentric degree of the multilayer hole is high; common production equipment is used; the production cost is reduced; the production resources are saved; the work efficiency is high, and is 5 to 7 times of that of the precise machining equipment; the operation is simple; convenience is realized; the implementation is easy; the requirements on environment are low. The direct precise positioning can be directly realized on the steel plate; the later-stage construction is convenient.

Description

technical field

[0001] The invention belongs to the field of scribing and opening of workpieces, and in particular relates to a method for opening concentric elliptical holes of multi-layer superimposed arc webs with different curvatures. Background technique

[0002] In a wide range of high-rise structures and highway bridge projects, the main body of the steel structure in the underground part needs to be combined with the concrete structure, so that a large number of steel bars need to pass through the main part of the steel structure. In order to ensure the safety of the structure, the reinforcement holes opened in the main body of the steel structure are required to have high concentricity and accuracy. The traditional method of opening holes is to enlarge the diameter of the hole, mechanical processing, and on-site drilling. These methods cannot guarantee the accuracy of the hole. There are a large number of defects on the surface of the hole, which affects the safety ...

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