Elongation automatic testing apparatus and testing method of stretcher

Abstract

The invention relates to the technical field of metal material mechanical property testing, and specifically relates to an elongation automatic testing apparatus and a testing method of a stretcher. Currently, a data collecting method of a maximal elongation under a test load is an artificial dotting and marking method which requires an operator to get approach to a test sample. When the quality of the sample is substandard, and brittle fracture is happened in advance, the personal safety of the operator is directly endangered. According to the invention, a right-angle frame assembled with a guide wheel support, a turning wheel support, and displacement sensors A and B is fixed on a top crossbeam of a stretching tester by using bolts; high-duty magnet absorption pedestals A and B are absorbed on a gauge length of the test sample; through the extension and the contraction of pull ropes A and B, the wheel hubs of the displacement sensors A and B rotate under driving, and an electrical signal with a certain proportion to the displacement distance of the pull ropes is outputted, such that the data of the maximal elongation under the test load is automatically collected during the stretching test. Therefore, artificial dotting measuring is replaced, and the securities of personnel and equipment are ensured.

Description

technical field [0001] The invention relates to the technical field of testing the mechanical properties of metal materials, in particular to an automatic testing device and testing method for elongation of a stretching machine. Background technique [0002] In the prior art, the data collection method of "maximum elongation under test load" during the tensile test of the mechanical properties of metal materials is based on the requirements of the national standard GB / T12718 and ISO610 standards, and the test method of manual dots and lines is adopted: in the sample Impact an original point with a metal point punch at one end, start the testing machine to load the sample to the specified initial load, stop loading the holding load, use one end of the drawing gauge to center on the original point, and the other end of the drawing gauge to describe the first point of the specified gauge length An arc; when the testing machine continues to load and wait to be stretched to the s...

AI Technical Summary

Problems solved by technology

Although the process is not complicated, it is operated under the condition of heavy load on the sample (for example: the test load of 34×126 grade C chain is 1160kN; the test load of 30×108 grade D chain is 1130kN, the larger the specification, the greater the load), manual Close contact test sample collection data, if the sample material does not meet the standard requirements and brittle fracture occurs early, it will directly endanger the personal safety of the operator, which is very dangerous

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