Parameter analysis of fatigue strength tester for automobile rearview mirror

The purpose of the present invention can be achieved by the following technical solutions: A fatigue strength reliability test equipment for automobile rearview mirrors, including a frame, a control system and a test system installed on the frame, and a fixture system for installing the automobile rearview mirror, The clamp system includes a bracket and a mounting frame mounted on the bracket. The car rearview mirror is mounted on the mounting frame and can be electrically connected to a control system. The mounting frame 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 installed on the frame and electrically connected to the control system. The tester detects the movement state of the rearview mirror of the car and feeds it back to the control system. The mounting plate is an aluminum alloy, and the aluminum alloy is composed of the following weight percentages: S1: 0.10-0.30%, Cu: 3.50-4.00%, Mg: 0.30-0.50%, Mn: In the initial state of the present invention, The fixture system is installed on the frame. After installing the vehicle 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 supply, and the control system sends Instruction, the fixture system moves, the car rearview mirror swings up and down or left and right, the detector in the test system detects the movement 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 lightweight aluminum alloy. In order to obtain a better performance of the mounting plate aluminum alloy, on the basis of the existing 2A14 aluminum alloy chemical composition, each alloy element is strictly controlled The composition ratio of the alloy further controls the main elements such as Cu, Mg, Mn, and reduces the content of Fe, S1, Zn, T1, and Ni. In the field of alloy technology, a small change in the composition can lead to the performance of the alloy. At the same time, the aluminum alloy used in the mounting plate through the synergy between the various alloy elements makes the mounting plate light and at the same time improving the processing performance and mechanical properties of the mounting plate, thereby improving the reliability of the fatigue strength 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 automobile 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. The dispersed particles hinder the growth of recrystallized grains. Can significantly refine the recrystallized grains. And MnAl6 can dissolve the impurity Fe to form (Fe, Mn) Al6, reducing the harmful effects of Fe. However, when the Mn content is too high, coarse crystals are formed during casting and the elongation is reduced. Therefore, the present invention controls the content of Mn element in the aluminum alloy of the mounting plate to 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 very different, but Cu can dissolve in Al. Therefore, after adding Cu to aluminum alloy, the lattice of Al will be greatly distorted, resulting in a significant strengthening effect. As the Cu content increases, the strength of the aluminum alloy increases, but the elongation decreases. Studies have shown that the overall performance of the alloy is the best when the copper content is 3.5-4.0%. If the Cu addition amount exceeds 4.5%, not only will the elongation of the aluminum alloy be reduced, the fluidity will be deteriorated, but also the cost will increase. Therefore, in order to ensure that the mounting plate aluminum alloy has good processing and mechanical properties, the Cu content is controlled within the scope of the present invention. The 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 the tensile strength and hardness of the aluminum alloy. However, if the Mg content is too high, exceeding 0.6%, its 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 at the same time. In addition, Mn can also uniformly precipitate the Mg5Al8K compound and improve the corrosion resistance of the alloy. Therefore, considering all 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, Zn and Mg to the aluminum alloy used in the mounting plate has a joint effect, which can significantly improve the fluidity of the alloy, increase the hot brittleness, tensile strength and yield strength, and reduce the 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 it is enough to add an appropriate amount of 0.1-0.3% Zn. Ti can also form TiAl2 phase with Al element, which becomes the 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 and the elongation of the aluminum alloy material will decrease. In order to control the harmful effects of Ti, take advantage of its beneficial effects, try to control the amount of Ti added in the aluminum alloy of the present invention, and strictly control it at 0.05-0.1%.

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