工艺参数对空心药柱压制成型后回弹的影响OA北大核心

The springback of grain formed by pressing molding from polymer bonded explosive(PBX)powder is too large,resulting in uneven density distribution of the grain and affecting the quality of the grain.Based on the pressing molding method of explosive powder in continuum mechanics,a hollow grain pressing model of JOB-9003 was established u-sing Shima-Oyane material model.And the influence of different process parameters on the springback of hollow grain formed by pressing molding was analyzed.The results show that Shima-Oyane material model can effectively analyze the springback of hollow grain formed by pressing molding.The springback of the grain is larger at both ends and smaller in the middle in the axial direction.In the radial direction,the springback fluctuations in the inner and outer circular areas are larger,while the changes in the middle layer areas are smaller.When the pressing force is 20 MPa,the holding time is 60 s,and the pressing speed is 2 mm/s,the springback of the grain is the lowest,at 0.271 mm.And the average relative density is the highest,at 0.974.The densification degree of the grain is high,and the molding guality is good.