Parameter analysis of fatigue strength tester for automobile rearview mirror1

The object of the present invention can be realized by the following technical solutions: a kind of automobile rearview mirror fatigue strength reliability testing equipment, including frame, the control system and the test system that are installed on the frame and the fixture system that installs the automobile rearview mirror, The clamp system includes a bracket and a mounting bracket mounted on the bracket, the automobile rearview mirror is mounted on the mounting bracket and can be electrically connected to a control system, the mounting bracket includes a mounting plate, a steering mechanism and a power mechanism, the control system Control the action of the fixture system, the test system includes a tester, the tester is installed on the frame and is electrically connected to the control system, the tester detects the motion state of the rearview mirror of the automobile and feeds back to the control system, wherein the tester is The mounting plate is an aluminum alloy, and the aluminum alloy is composed of the following components by weight: S1: 0.10-0.30%, Cu: 3.50-4.00%, Mg: 0.30-0.50%, Mn: the present invention is in the initial state, The fixture system is installed on the frame. After installing the car rearview mirror to be tested on the mounting frame, the power system is electrically connected to the control system. The control system controls the motor action according to the set instructions, turns on the power, and the control system sends Command, fixture system action, the car rearview mirror swings up and down or left and right, the detector in the test system detects the movement and operation of the car rearview mirror and the number of actions, and feeds back the data to the control system. When the data reaches the setting in the control system , the control system sends a stop action command, and the test ends. Secondly, the mounting plate of the mounting frame in the fixture system of the present invention is made of light-weight aluminum alloy material. In order to obtain the aluminum alloy of the mounting plate with better performance, on the basis of the chemical composition of the existing 2A14 aluminum alloy, each alloy element is strictly controlled. The composition ratio of the alloy further controls the main elements such as Cu, Mg, and Mn, and reduces the content of Fe, S1, Zn, T1, and Ni. In the field of alloy technology, a slight change in a composition can lead to alloy performance. At the same time, the aluminum alloy used in the mounting plate makes the mounting plate light and improves the machining performance and mechanical properties of the mounting plate through the synergistic effect between the various alloy elements, thereby improving the fatigue strength and reliability of the automobile rearview mirror. Test the mechanical properties of the equipment and extend the service life of the fatigue strength reliability test equipment for automotive rearview mirrors. Mn is the main element in the aluminum alloy used in the mounting plate. It can partially dissolve into the matrix, refine the material structure, and increase the recrystallization temperature. Mn and Al form MnAl6 compound dispersed particles and hinder the growth of recrystallized grains. Recrystallized grains can be significantly refined. And MnAl6 can dissolve the impurity Fe, form (Fe, Mn) Al6, reduce the harmful effect of Fe. However, when the Mn content is too high, coarse crystals are formed during casting, and the elongation is lowered. Therefore, the present invention controls the content of Mn element in the aluminum alloy of the mounting plate to be 0.8-1.2%. Cu is an essential element for improving the tensile strength and elongation of aluminum alloys. The lattice constants of Cu and Al are quite different, but Cu can dissolve in Al. Therefore, after adding Cu to the aluminum alloy, the lattice of Al is greatly distorted, resulting in a very significant strengthening effect. With the increase of Cu content, the strength of the aluminum alloy increases but the elongation decreases. The research shows that when the copper content is 3.5-4.0%, the overall performance of the alloy is the best. If the addition of Cu exceeds 4.5%, it will not only lead to a decrease in the elongation and fluidity of the aluminum alloy, but also increase the cost. Therefore, in order to ensure that the aluminum alloy of the mounting plate has good workability and mechanical properties, the Cu content is controlled within the scope of the present invention. Mg in the aluminum alloy is precipitated in the state of the strengthening phase Mg2Si after heat treatment, which can improve the mechanical properties such as tensile strength and hardness of the aluminum alloy. However, if the Mg content is too high, exceeding 0.6%, the elongation will decrease. However, because the addition of Mn has the effect of supplementary strengthening, the addition of Mn can reduce the Mg content and reduce the tendency of hot cracking. In addition, Mn can also make the Mg5Al8K compound precipitate uniformly and improve the corrosion resistance of the alloy. Therefore, considering various factors, the Mg content is controlled at 0.3-0.5%, and the tensile strength and hardness of the aluminum alloy of the mounting plate are the best. Adding Zn to the aluminum alloy used in the mounting plate, Zn and Mg have a combined effect, which can significantly improve the fluidity of the alloy, increase hot brittleness, tensile strength and yield strength, and reduce corrosion resistance. However, the improvement of the strength of aluminum alloy by Zn is very limited, and there is a tendency of stress corrosion cracking, so an appropriate amount of 0.1-0.3% Zn can be added. Ti can also form TiAl2 phase with Al element, which becomes a non-spontaneous core during crystallization and plays a role in refining the structure. If the titanium content is too high, coarse compounds will be formed, which will reduce the ductility of the aluminum alloy material. In order to control the harmful effect of Ti and take advantage of its beneficial effect, try to control the addition amount of Ti in the aluminum alloy of the present invention, and strictly control it at 0.05-0.1%. In the aluminum alloy of the mounting plate, Fe and Si are impurities, but they are also essential elements, which have a significant impact on the performance of the aluminum alloy.

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