Left-right turning screw rod stretcher specially used in metallic plastic deformation and recrystallization test

Abstract

The invention provides a left-right turning screw rod stretcher specially used in a metallic plastic deformation and recrystallization test. The stretcher comprises an electric appliance control part, a screw rod transmission part, a mechanic transmission part and an aluminum sheet clamp part, wherein by the rotation of a left-right turning ball screw rod in the screw rod transmission part, a sample, of which both ends are tightly clamped, is outward stretched from the left and the right sides at the same time, and the stretching force is kept stable and uniform during stretching; the stretching size can be controlled to the micrometer level by the accurate step pitch turning angle of a stepper motor, so that the stretching in different deformation degrees can be realized according to the test requirements; and simultaneously, an assembled displacement ranging rod is connected with a working table of the clamp, so that the stretching distance can be quite accurately measured and displayed, the deflection generated when the sample is stretched can be accurately shown, and the success ratio of the test is improved.

Description

technical field [0001] The invention relates to the field of special stretching machines for experiments, in particular to a left and right screw screw stretching machine for metal plastic deformation and recrystallization experiments. Background technique [0002] According to the requirements of the teaching syllabus of the State Education Commission, in the engineering majors of colleges and universities, especially in the experimental teaching of undergraduates majoring in materials processing engineering or mechanical engineering, every undergraduate student must conduct a "metal plastic deformation and recrystallization experiment". For the performance test of "metal plastic deformation and recrystallization" for pure aluminum sheets with a material thickness of less than one millimeter, a special stretching machine is used to stretch the aluminum sheets with different degrees of deformation. After stretching After annealing and pickling, the recrystallized macrostruct...

AI Technical Summary

Problems solved by technology

It can be seen from the experiment that the accuracy of the deformation of the aluminum sheet sample is very high during the stretching deformation process, and the stretching process must be uniform in order to satisfy the stretching effect. The experimental results are greatly influenced by human factors. For a long time, such The effect of experimental teaching has not been ideal

[0003] In the existing experimental teaching process, some colleges and universities generally use non-standard self-made right-handed stretching machines. This kind of aluminum sheet deformation stretching machine has low deformation control accuracy and repeatability of deformation during stretching. Poor, single-ended stretching will also lead to uneven recrystallization at both ends, and accurate deformation and stretching cannot be achieved in strict accordance with the requirements of experimental teaching; because it is difficult to control the amount of deformation and speed during stretching, errors in the amount of deformation occur Larger, not to mention that the theoretical laws of metal plastic deformation and recrystallization mentioned in the experimental purpose cannot be fully realized, the experimental effect is not ideal, and the teaching objectives and requirements of "combining theory with practice and theory guiding practice" cannot be realized

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