Mechanical Mechanism Of Cold Rolling Compound And Experimental Study Of Electric Pulse Assisted Compound Rolling

With the development of global economy and the emergence of various new technologies and industries,composite materials have attracted more and more attention all over the world.Since the rolling method was put forward,it shows obvious advantages and has become the most widely used metal composite technology in the world.Up to now,a large number of scholars have studied the interface diffusion,interface metal compounds,composite properties and so on.However,as a large-scale production process,the technological mechanism of rolling composite is rarely mentioned,which leads to the current rolling production process setting is almost formed experience,which greatly restricts the improvement of production efficiency.In addition,the coordination of rolling deformation and thermal diffusion is still one of the hot issues.In this paper,the compound rolling process model will be focus on,and study with view of the combined mechanical mechanism,through mechanical analysis,rolling simulation,experimental verification and so on.On this basis,the coupling relationship between interface pressure and temperature being considered,a new exploration of cold rolling compound method is carried out.In the new method,high frequency pulse current is introduced into the rolling deformation zone,and the controllable interface temperature field can be realized through the parameter selection of rolling and pulse,and a better cold rolling combination will be achieved.Firstly,through the simulation of compound rolling process,the deformation behavior characteristics of compound rolling process are analyzed.Compared with the existing rolling bonding mechanism,the coupling mechanism including compressive stress,temperature,shear stress and other factors is discussed.The mechanical behavior theory of bonding judgment of compound rolling is established,and the composite mechanism is verified by interface metallographic observation of rolling composite sample.Then,the verification compound rolling experiment of Cu/Al was carried out at room temperature,to observe and analyze the deformation behavior in the peeling test,reveal the influence of the deformation behavior of the sample on the peeling load,establish the relationship between the bonding strength and the peeling deformation behavior,and clearly the test method with comparable peeling results.Based on the reliable test,the influences of different processes such as reduction rate,multi pass and variable velocity were studied.Combined with the interface observation of samples,the mechanical mechanism of rolling bonding was verified.Finally,based on the coordination of rolling deformation and heat diffusion in the compound rolling process,the idea of temperature control in compound cold rolling is proposed.The interface temperature control ability is improved by introducing high frequency pulse current into the rolling deformation zone.The results of peeling test of the samples after rolling were analyzed and the influence of the electric pulse on the composite was observed.The results show that the pulse improves the binding effect obviously.The stress field and temperature field in the deformation zone under the aid of pulse are analyzed by simulation.The mechanism of the influence of electric pulse with multi parameters on compound rolling is expounded,and the optimization route of pulse compound rolling process is discussed.The study of the mechanism of compound rolling has a full and important engineering significance for the production of composite plates.The compound cold rolling with precise control interface temperature reduces energy consumption,provides a harmonious production mode of environment,and is the most active response to the national "energy conservation and emission reduction" policy.