Study On Extrusion Forming Process Of Sleeve Parts With Knots

Irregular parts with high strength usually bear high load and play an important role in the system. In view of high energy waste, low material utilization and unsatisfactory mechanical properties of the traditional forming processes for irregular parts with high strength, the warm/cold compound extrusion process was introduced through the process analysis of sleeve parts with knots, a typical irregular parts with high strength in this thesis and the following research was carried out:Using numerical simulation method of finite element, the flow law of metals during warm extrusion process and the influence of technological parameters on extrusion process was analyzed. Emphatically, the influence of different forming methods (opened-die or closed-die), deformation temperature, speed and friction on the equivalent strain, the quality of filling and load-stroke curves was discussed. The results show that using opened-die warm extrusion forming, under the conditions of 800℃and 10mm/s, the workpieces had good plasticity, homogeneous deformation, low extrusion pressure, and no cracks.According to the simulation results, extrusion part drawing was determined. Proper cold finishing amount and effective cold finishing scheme was studied. Warm extrusion die and cold finishing die were designed. Finally, experimental study and small-scale production was conducted.The results show that the products have perfect shape and cold extrusion finishing surfaces have high precision and quality. The following machining is easier. The comprehensive mechanical properties are improved. The material utilization increase 40% and the economic benefits are high. The application of warm/cold compound extrusion process has a reference value to the similar parts.