A clamping and fixing device for compressing metal sheets

Abstract

The invention relates to a clamping fixing device for compressing a metal sheet. The device utilizes a base to position and fix clamping blocks and a test sample; vertical trapezoid grooves are processed on contact surfaces of the clamping blocks and the test sample; the gauge length at the width center of the test sample is visible in the middle through slots of the clamping blocks; guiding rodsare arranged on diagonal positions of the clamping blocks so as to align the two clamping blocks; eight full-thread hex head screws are penetrated into the first clamping block and out from the secondclamping block; gaskets and nuts are arranged at the tail ends of the bolts; uniform symmetrical pressure is applied to the clamping blocks, so that the test sample is prevented from being unstable;four half-thread hex head screws are penetrated into four lug bosses on the base, are inserted into the blind holes on the two sides of the middle part of the clamping blocks and are twisted; the clamping blocks are used for clamping the test sample for the second time and supplying effective support, so that the test sample is prevented from bending damage. The clamp is designed according to therequirement of metallic material compression test standard, is convenient and easy in operation and can be applied to the standard compression tests for various metal sheets in various thicknesses.

Description

technical field [0001] The invention relates to a clamping and fixing device for compressing a thin metal plate, which belongs to the technical field of testing. Background technique [0002] Metal sheet compression is an important test method for the static properties of materials. Obtaining the compression yield strength and compressive elastic modulus of metal sheets is of great significance for material selection and design. When the metal sheet is subjected to a compression test, when the sample is subjected to a compressive axial load, a large bending stress will be generated along the lateral direction, causing the sample to buckle and the test to fail. Therefore, domestic metal sheet compression tests are seldom carried out, and even fewer tests meet the requirements of the standard. [0003] At present, the following types of clamping and fixing devices for metal sheet compression are mainly proposed abroad: Pack method; 2. Single test block method; 3. N.B.S solid ...

AI Technical Summary

Problems solved by technology

The device applies lateral pressure through the spring, which can automatically adjust according to the change of the thickness of the thin plate, and then fixes the sample with two screws outside the clamping block, so that the thin plate tension-compression test can be performed, but the thin plate suffers from bending during the compression process. The stress is huge, and it is difficult to ensure that the sample does not buckle only through the spring and two screws, and the two sections of the sample are in full contact with the splint, which will generate a lot of friction

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