Research Of Simulation On Continuous Extrusion And Rolling Of Copper Strips

Copper strip is widely use for various industries and fields like aerospace, automotive, electronics, construction, communications, and so on, one of main production modes of which is the continuous extrusion technique. The development of continuous extrusion technology is increasingly mature, and it has advantages of excellent product performance, production mode of achieving unlimited product, energy conservation, environmental protection and so on. Based on the continuous extrusion, continuous extrusion and rolling technology is a burgeoning and green manufacturing technology of energy efficiency limit technology.When using continuous extrusion and rolling to produce copper strips, there must be micro tension between continuous extrusion machine and rolling mill, which is the guarantee of the process going smoothly and the precondition of product quality. Owning to the advantage of energy efficiency limit, energy conservation, environmental protection, and so on, the continuous extrusion and rolling technology has a promising development space. This paper has deeply researched the deformation regularity of copper strips in the process of continuous extrusion and rolling, which will play a guiding role in the application of practical continuous extrusion and rolling.Based on TLJ400 continuous extrusion machine and roller diameter is 250 mm rolling mill is the model of the continuous extrusion and rolling in this paper. Through theoretical calculation, the velocities in the forming process of continuous extrusion and rolling are confirmed, the condition of micro tension of continuous extrusion and rolling forming process is established, linear velocity of roll is confirmed by the compatibility equation of speed of continuous extrusion and rolling forming process, the force equation of the continuous extrusion and rolling forming process is established by engineering method; the deformation regularity of strips in the forming process of continuous extrusion and rolling under different technological parameter is simulated through DEFORM software; the flow regularity of billet in the forming process of numerical simulation is verified by physical simulation; the accuracy of the temperature and speed of billet and the torque of extrusion wheel are verified by experiment of continuous extrusion and rolling.The results of numerical simulation of continuous extrusion and rolling show:As producing the same size of strips from the process of continuous extrusion, the temperature of billet is falling, the torque of extrusion wheel and stress of chamber are firstly descent then ascent, the torque of roll and rolling force are both rising with increase of rolling reduction.As producing the same size of strips from the process of continuous extrusion and rolling, strips produced by continuous extrusion have the same width, as increase of thickness of strips, rolling reduction is required greater, the temperature of billet is reduced, the torque of extrusion wheel and stress of chamber become smaller, but the torque of roll and rolling force is risen.The temperature of billet is increased, but the torque of extrusion wheel and roll, stress of chamber and rolling force are declined with increase of velocity of extrusion wheel.For the numerical simulation, the physical simulation of the continuous extrusion of strips of copper is conducted with the size of 80×10mm2、120×10mm2、170×10mm2, and the physical simulation of the rolling that is the 2mm of rolling reduction for 80×10mm2 of strip. The experiment of continuous extrusion and rolling is conducted for presenting strip with 120×10mm2 and rolling reduction with 2mm. The results of those are marched with the results of numerical simulation.