Extrusion Simulation and Result Analysis In the extrusion process, there are many factors that affect the quality of the extrusion, the flow of the metal, the deformation resistance of the extrusion, and the temperature distribution of the extrusion. In a nutshell, it mainly includes two major aspects: one is the mold geometry; the other is the extrusion process parameters. These two aspects will have a great impact on the extrusion results. Study the effects of mold transition fillet, lubrication conditions, heating temperature on the quality of the formed workpiece and the compressive force and the stress distribution and temperature distribution of the workpiece, so as to understand the influence of these parameters on the extrusion process, to optimize the process, select the most The purpose of the good process parameters. In the first step of the simulation process, the temperature rise is concentrated in the deformation zone of the workpiece, that is, the wedge-shaped portion, and the maximum temperature is 435.1K (ie, 164e). This temperature has little effect on the material properties and does not cause surface oxidation; the thermal effect generated during the extrusion process can increase the temperature of the extruded blank, which is not really performed at room temperature. It is done at a certain temperature. After the temperature is raised, the deformation ability of the material is improved to facilitate the flow of the material, which is advantageous for the formation of the extruded member. The maximum pressing force is 1612kN, which is in line with the actual use range of the 200t hydraulic press. In this process, the material is formed well to achieve the desired effect. The maximum equivalent stress is 509.7 MPa, and the maximum temperature reached by the formed part in extrusion engineering is 164e, and the maximum pressing force is 1612kN, which meets the forming requirements. The initial process parameters do not need to be adjusted. In the second step (after improvement), when the friction factor is 0.2, the maximum equivalent stress of the formed part is 713.9 MPa, but it acts on the burr part, so the workpiece performance is not affected, and the equivalent stress of the workpiece part is mostly 357 MPa. Less than the Rb of the material does not cause cracking of the material. The equivalent stress is smaller than the original and the distribution is more uniform. Process 3 For warm extrusion, the choice of temperature has a great influence on the performance of the product. The higher the temperature, the easier the metal is to oxidize and the shorter the service life of the mold. Therefore, the temperature can be appropriately lowered when the forming requirements are met. The temperature of the press was set to 650e for simulation. The stress distribution of the formed part is as shown in (b). From the simulation results, the maximum equivalent stress is larger than the original but the distribution is very uniform and less than the Rb of the extruded material. The temperature distribution of the workpiece (c) is lower than the original, which reduces the possibility of oxidation of the workpiece. The maximum pressing force is slightly larger than the original, which is 2467kN, but it is still within the range of 300t hydraulic press. Conclusion In this paper, the ground spring mandrel is taken as an example to study the influence of different mold design parameters and extrusion process parameters on the extrusion process, to achieve the optimization process and to select the best process parameters. 1) When the transition fillet radius in the die is increased from 0.5 mm to 1 mm, the equivalent stress experienced by the blank is reduced. In the third step, the original convex cavity has a small rounded corner, which causes surface defects of the formed part, and the defect is improved after the rounding is increased. 2) The quality of the lubrication condition (the magnitude of the friction factor) has a certain influence on the pressing force, the forming effect of the extrusion member, the stress on the extrusion member, and the temperature distribution on the extrusion member. Therefore, it is necessary to use a lubricant in cold-temperature extrusion, which has the following functions: significantly reducing the friction coefficient between the mold and the deformed metal; reducing the wear of the mold, preventing the mold from being damaged and improving the service life of the mold; and preventing each due to additional stress A kind of extrusion scrap. Therefore, the lubricant should be selected according to the needs of the molded parts to improve the friction conditions. For the temperature extrusion in the range of 400800e, graphite and cylinder oil can be used, and the graphite oil mixed in a ratio of 1B2 is used as the lubricating oil, and the friction factor is 0.2. S Series Variable Volume Micropipettes 1-10 ml S Series Variable Volume Micropipette,Variable Volume Micropipettes Single Channel Topscien Instrument(Ningbo China)Co.,LTD , https://www.centrifugesupply.com
Simulation analysis of ground-spring structure weak temperature mixing and compression data
Extrusion Simulation and Result Analysis In the extrusion process, there are many factors that affect the quality of the extrusion, the flow of the metal, the deformation resistance of the extrusion, and the temperature distribution of the extrusion. In a nutshell, it mainly includes two major aspects: one is the mold geometry; the other is the extrusion process parameters. These two aspects are for the extrusion knot