The Design And Study Of The Automatic Silver Paper Machine

With the rapidly developing of the national economy, the application of silver paper is increasingly widespread, and the demand is also rapidly growing. Tin products with high quality have a great deal of market prospects in China. However, the silver paper is mainly produced by handcraft in China, which pollutes the environments and damages human health, so the status needs to be urgently improved. A new type of automatic silver paper machine is studied and designed in this thesis, in order to reduce the pollution and improve the quality and manufacturing efficiency of silverpaper. The forming of silver paper follows such process: solid-liquid-solid silverpaper-given size silver paper. Based on the Bernoulli equation, the thickness of thesilver paper could be controlled by adjusting the speed of the molten tin. The prototype of silver paper machine is studied in this thesis, which is economical, practical and with simple control system, in the same time, it is also providing a good foundation for designing and producing the new silver paper machine.The main contents of the thesis are summarized as follows:1. After studying the overview of literatures on producing technology of aluminum foil, and material forming technology, especially, the continuous casting technology and rapid solidification technology, the base of the characteristic of the silver paper, the automation scheme for silver paper producing is studied2. According to the law of the fluid mechanics, the forming principle of silver paper is studied from the point of view of liquid forming technology. And on this basis, general implementation scheme is studied.3. The heat transfer in silver paper's forming process is analyzed. The heat transfer mathematical model is established, and the mathematical equations are discretized by the finite volume method. At last, a simulation of the temperature field is implemented by the FLUENT software.4. The mechanical system including transmitting parts, shearing parts, and silver paper collecting parts is studied in this thesis. 5. The thickness of silver paper is determined by the speed of the conveyor belt. In order to make the speed of the conveyor's driving motor controllablity, the motor's speed control circuitry is studied in the fourth chapter.6. The pneumatic circuits of the shearing and collecting parts are studied, and besides, the kinematics and dynamics performances are studied.