Sheet metal tensile test clamp

Abstract

The invention discloses a sheet metal tensile test clamp which comprises a clamp base with a connecting piece mounted at the bottom, two supporting columns are arranged on the upper end face of the clamp base, two wedge-shaped pressing blocks are slidably arranged between the two supporting columns, and the clamp base is arranged in a hollow pressing ring; a connecting through hole is formed in the top of the hollow pressing ring, the upper end of each supporting column penetrates through the connecting through hole and is then connected with a connecting ring, a limiting block is arranged at the side, close to the wedge-shaped pressing block, of the top of the supporting column, a sample limiting plate is fixedly connected to the top of the limiting block, and a sample inserting opening for inserting a to-be-tested sample is formed in the sample limiting plate; an arc-shaped outer vertical face is arranged in the outer side of the wedge-shaped pressing block, a groove is formed in the upper portion of the arc-shaped outer vertical face, a lead screw penetrates through the side wall of the connecting ring, and the tail end of the lead screw is inserted into the groove; the side wall of the hollow pressing ring is in threaded connection with a handle; and the inner wall of the connecting through hole is of an inclined structure. According to the invention, when the to-be-tested test piece is pressed, the applied load is consistent, and the to-be-tested test piece does not slip in the stretching process, so that a test error is smaller.

Description

technical field [0001] The invention relates to the technical field of tensile test devices, in particular to a metal plate tensile test jig. Background technique [0002] At present, there are mainly two types of clamping parts of mechanical fixtures used for uniaxial tensile tests: wedge clamping and push clamping. These two types of fixtures have the characteristics of simple structure and convenient operation, and are most widely used on universal material testing machines. The remarkable feature of wedge clamping is that each of the two clamping wedges has an inclined surface. As the tension increases during the stretching process, these two inclined surfaces make the tension in the vertical direction have a component force along the horizontal direction, so that The wedge further clamps the specimen horizontally to avoid slipping. However, when the wedge is clamped, it is easy to generate additional force on the test piece and cause pre-deformation. Horizontal push ...

AI Technical Summary

Problems solved by technology

Hydraulic power needs to be provided by a hydraulic system, which greatly increases the size of the fixture and the design and manufacturing cost

[0003] To sum up, the horizontal push clamping mechanical fixture will not cause pre-deformation, but it is prone to slipping; the wedge clamping mechanical fixture is not easy to slip, but there is additional force, so the current clamping fixture has a narrow application range

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