Micro-shearing testing apparatus

Abstract

The invention discloses a micro-shearing testing apparatus. The micro-shearing testing apparatus comprises a base; a sample fixing device on the base comprises a sample bearer, a front clamping blockand a rear clamping block; a cutter comprises a cutter handle connected with a tensile testing machine and a cutter head arranged on the bottom of the cutter handle; the base is provided with a hollowframework located at the front end of the sample fixing device; the hollow framework is provided with two face-to-face pressing-block support arms; a pressing block is slidably arranged between the two pressing-block support arms; a gear is arranged above the pressing block; both ends of the gear are axially provided with disc-shaped cams that rotate synchronously with the gear; the disc-shaped cams abut against the pressing block; the cutter handle longitudinally passes through the top of the framework, and the side wall of the lower part of the cutter handle is provided with a rack matchedwith the gear; and the front end of a to-be-measured sample extends into the hollow part of the framework and is located below the cutter head and the pressing block. The apparatus further comprises alinear bearing located on the top of the framework; the central part of the linear bearing is provided with an axial through hole; and the cutter handle can move up and down to pass through the axialthrough hole. The apparatus allows the cutter head to always realize vertical shearing of to-be-measured test pieces and is accurate in measurement.

Description

technical field [0001] The invention relates to the field of welded joint detection, in particular to a micro-shear test device. Background technique [0002] After two or more parts are connected by welding, a welded joint is formed at the joint. The mechanical properties of the welded joint have a direct impact on the welding quality. Therefore, it is necessary to improve the welding process and improve the welding quality by studying the mechanical properties of the welded joint. strength. Shear strength is one of the basic parameters to evaluate the mechanical properties of welded joints. Due to the inhomogeneity of the mechanical properties of welded joints, the mechanical properties of different positions on the welded joints also have a complex impact on the overall bearing capacity, so it is necessary to Different regions of the welded joint are sheared (that is, micro-sheared) to measure the local shear strength of the welded joint, thereby realizing an accurate ev...

AI Technical Summary

Problems solved by technology

[0005] In the micro-shear test device provided by the prior art, the clamping of the tool handle by the universal testing machine is unstable, which may easily cause the shear angle of the tool head to be tested to be deflected, affecting the accuracy of the shear strength value

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