Mechanical Principle of Shaper Course Design
The purpose of the course was to design, analyze, and perform dynamic and static analysis on the main mechanisms of machinery (such as connecting rod mechanisms, gear mechanisms, and so on), as well as to design the gears and gears according to the work requirements of the given machine. 1. ** Purpose * - Deepen students 'theoretical knowledge and cultivate their ability to solve practical problems independently. - To let the students have a complete concept of the analysis and design of mechanical kinematics and dynamics. - Students were trained to draw up a sports plan, and they were equipped with the ability to design, select, combine, and determine the transmission plan. - To improve the students 'ability to calculate, draw, express, use computers, and access technical information. 2. ** Quest Requirements ** - According to the design task, draw the necessary drawings and write the instructions. - The main body of the shapers must be designed, and the dynamic and static analysis must be done. For example, in the aspect of motion analysis, it was necessary to analyze the speed and acceleration of different positions of the guide rod mechanism. In the aspect of dynamic static analysis, it was necessary to calculate the inertia force, the dynamic static analysis of the rod group, and the calculation of the equilibrium moment. 3. ** Design Method ** - It mainly used the graphic method, which was clear and intuitive. Of course, there was also an analytical method, which was more accurate. During the design process, the actual working requirements of the shapers needed to be considered. For example, in order to improve work efficiency, the planer must be quickly retracted during the empty return trip (the travel speed ratio coefficient is about 1.4); the speed of the planer must be stable during the working stroke, and the cutting stage should be approximately uniform. At the same time, factors such as the stroke of the planer, cutting resistance, and motor speed should also be considered. For example, the speed of the cranks is 72r/min, the stroke of the planer is about 300mm, and the cutting resistance is about 8000N. When the planer is working, the motor is driven by the belt and the gear to drive the cranks and the cam-fixed on it. The guide rod mechanism drives the planer head and the planer knife to do a reciprocation. When the planer head goes to the right, it is the working stroke, and when it goes to the left, it is the idle stroke. The idle stroke time is used to drive the screw mechanism through the cam-fixed four-bar mechanism and the ratchets to make the workbench and the work piece do a feeding movement. In addition, due to the large change in the force on the plow head during the entire motion cycle, it would affect the uniform operation of the main shaft. Therefore, it was necessary to install a flywheels to reduce the speed fluctuation of the main shaft, improve the cutting quality, and reduce the capacity of the motor.
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