Mechanism Design And Simulation Of Intermediate Billet Solid Connection Device

Traditional plate and wire rolling is intermittent rolling,the length of the billet is limited,the size of the finished product is fixed and the length is short,the fluctuation is easy to occur in the intermittent rolling process,result in the product accuracy is not high,the qualified rate is low,and the rolling process has impact on the rolling mill many times,reducing the service life of the equipment.Continuous billet rolling can be realized through the intermediate billet solid state connection technology,which can realize the rapid connection of the front and rear billets in the process of movement,so that the conventional rolling becomes the endless rolling,greatly reduces the impact on the rolling mill in the rolling process,and improves the service life of the equipment and product accuracy.In this paper,a kind of intermediate billet solid connection device is designed.Firstly,a kind of intermediate billet solid connection mechanism is designed by analyzing the crank link mechanism and swing rod mechanism.By establishing the objective function and constraint condition of the mechanism,the structure of the mechanism is optimized by MATLAB.Secondly,on the basis of structural optimization,the design of the intermediate billet solid state connection device,through the device motion characteristics analysis,verify the rationality of the structure optimization of the intermediate billet solid state connection mechanism.A height adjusting device for connecting rod of upper die frame with different thickness of intermediate billets is designed.By reducing the length of connecting rod of upper die frame,the device is connected with intermediate billets of different thickness,which is beneficial to the realization of rolling technology.The finite element software ABAQUS is used to simulate the solid connection process of the intermediate billet and simulate the solid connection of the intermediate billet with different pressure reduction.The results show that the solid connection of the intermediate billet was successfully completed,and the connection effect is the best when the pressure reduction is 125%.The main parts of the device is calculated and checked.The solid model of the intermediate billet solid connection device is created through Solid Works.Modal analysis of the device shows that the natural frequency of the device is known to be about 1.6Hz.It is found that when the first mode is adopted,the z-axis rotation amplitude of EF connecting rod is large and one end is separated from the DE swing rod.The vibration frequency is 4.0441 Hz.In order to avoid affecting the overall structural strength of the device at low frequencies,and considering that the larger the difference between the resonant frequency and the running natural frequency,the smaller the impact of external excitation on the device,it is decided to improve the design of the EF connecting rod structure.It is concluded that when the two sides of the EF connecting rod were thickened by 2.5mm respectively,the modal frequencies of the first 6 orders of the device were concentrated at 8.565?83.282 Hz.The vibration mode of the device is mainly bending,rotation,etc.After improvement,the first-order modal frequency of the device is much higher than that before improvement.The first-order frequency is 8.565 Hz,more than 5 times of the operating frequency of the device.Therefore,the structure of EF connecting rod is improved to improve the overall strength of the device at low frequency and the overall stability of the device.