Special jig for triangular pin tensile test

Abstract

The present invention discloses a special jig for a triangular pin tensile test. The special jig comprises a sleeve tube and a stretching rod, the stretching rod is perpendicularly arranged on the top surface of the sleeve tube, an inner ring of the sleeve tube is provided with an internal thread, the special jig further comprises a clamping piece seat and three clamping pieces, an outer ring of the clamping piece seat is provided with an external thread, a conical hole is arranged at the center of the clamping piece seat, the clamping piece seat is screwed in the inner ring of the sleeve tube by the external thread of the outer ring, the three clamping pieces are one-third-round conical clamping piece and are located in the conical hole of the clamping piece seat, the cross-sectional shape of a space enclosed by the three clamping pieces is triangular, and the inner surfaces of the three clamping pieces are provided with holding teeth. The special jig can reliably clamp a triangular pin in the triangular pin tensile test, avoids damage to the triangular pin when the triangular pin is excessively clamped, ensures that the triangular pin does not slip and the tensile test is effective, and can reflect the mechanical properties of the triangular pin tensile test.

Description

technical field [0001] The invention relates to a special fixture for triangular pin tensile test. Background technique [0002] Tensile test is one of the basic methods of material mechanical performance test. It is mainly used to check whether the material meets the specified standards and to study the performance of the material. characteristics. The data obtained from the tensile test can determine the elastic limit, elongation, elastic modulus, proportional limit, area reduction, tensile strength, yield point, yield strength and other tensile performance indicators of the material. To carry out the tensile test, it is necessary to process the tested components into standard samples according to the corresponding standards, combined with the tensile testing machine used for the test, and then test them. For some special samples, it is necessary to equip special fixtures to hold the samples if physical inspection is required. The triangular pin is a connecting piece of...

AI Technical Summary

Problems solved by technology

The triangular pin is a connecting piece of mechanical parts. It has a special shape and is formed by cold drawing. If the traditional method is used for the tensile test, it is processed into a standard sample for testing. Because the hardened layer on the surface of the sample is removed, the tensile test The detected data cannot reflect its real mechanical properties

If the fixture equipped with the tensile testing machine is used, because of the special shape of the triangular pin and the short length, the clamping is not firm and the sample is easily pinched, causing the sample to be destroyed in advance, resulting in invalid test data

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