Center-free arc bending radius measuring ruler and bend pipe bending radius measuring method

Abstract

The invention provides a center-free arc bending radius measuring ruler and a bend pipe bending radius measuring method. The measuring ruler is respectively connected with a left supporting leg and a right supporting leg symmetrically at both ends of a cross beam; an extension rule is connected at the center of the cross beam; and the extension rule moves up and down along the vertical direction of the cross beam. The measuring method comprises the following steps of: firstly equally dividing the inner arc or outer arc of a bend pipe bending part into a plurality of parts; then respectively measuring the arc heights of partial arc segments by taking each equal diversion point as a beginning point in two directions of the inner arc or outer arc by adopting the center-free arc bending radius measuring ruler; then obtaining the radius of each partial arc segment through calculation; and finally calculating the average value of the radius of each partial arc segment so as to calculate a bend pipe bending radius. The tool has the characteristics of being simple to manufacture, simple to measure, easy to grasp and the like; the position of the circle center of a workpiece is not required to be found out; manual measurement can be carried out; the measuring ruler is convenient to observe and monitor; and the bend pipe bending radius can be measured under any condition of the workpiece.

Description

technical field [0001] The invention relates to a measuring tool and method for mechanical equipment, in particular to a centerless arc bending radius measuring ruler and a method for measuring the bending radius of an elbow. Background technique [0002] At present, the manufacture of large-diameter thick-walled pipe generally adopts intermediate frequency bending, machining forming, hot bending and cold bending. Among them, when the intermediate frequency bending is used, the bending arc of the elbow is naturally formed, and its bending radius is uniform, which is easy to measure accurately, but special intermediate frequency bending equipment is required; when the bending pipe is formed by machining, the bending radius of the elbow is uniform, and the bending radius is easy to measure. Accurate measurement, but the mechanical forming of the elbow also requires special machining equipment, the machining volume is large and the time is long, especially the machining of aust...

AI Technical Summary

Problems solved by technology

However, because the laser tracker or three-coordinate measuring instrument is expensive and requires professional operation, it is difficult for general inspectors and equipment supervisors to master and use it.

At the same time, when taking points before computer fitting, there are also artificial points, which are relatively random, which makes the repeatability of the pipe bending radius obtained by different times of computer fitting poor.

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