Numerical Simulation And Experimental Study Of Sintering Molybdenum Powder Shaped Liner Material Forming High-pressure Torsion

Shaped charge liner in high explosive-anti-tank is a key component of its warhead, its external structure and internal performance is closely related to the anti-tank performance of high explosive-anti-tank. Substantial literature shows that material, thickness, processing technology, the external shape and the internal organization of shaped charge liner all exert a great impact on the metal jet performance formed by the liner, and which is directly related to the anti-tank performance of high explosive-anti-tank. In recent years, the overseas study has shown that internal grain refinement of medicine can effectively improve the performance of shaped charge liner. First of all, the grain sizes of the micro-shaped jet of the shaped charge liner have a significant impact on the metal jet performance. Secondly, the compactness materials'microstructure, uniform and isotropic can also increase the continuity and stability of the jet.At the domestic study for the high-pressure torsion shaped charged liner is a new topic at the field of high-explosive anti-tank research. High-pressure torsion refers to a special plastic deformation process in which the pressure are given at the vertical direction of the deformed object; and at the same time, a torque is imposed at the transverse surface through the active friction, and thus made the the deformed object transformed at both of its axial compression and the shear deformation. The process of high-pressure torsion altered the internal stress-strain state of the deformed object, resulting in a severe shear deformation. On the one hand, it can improve the microstructure of materials, access to sub-micron or even the nano-leveled materials; on the other hand, the process of high-pressure torsion can improve the material solderability performance, especially obvious for the effect of sintering material.In this paper, numerical simulation and virtual combination of orthogonal test method are used to a deep study of the high-pressure torsion process of the molybdenum powder sintered shaped charge liner. The use of rigid viscoplastic finite element method simulation of high-pressure forming process to reverse, can reasonably and effectively reflect the parameters such as different cone angle, temperature, extrusion speed, the friction factor, angular velocity, and their impact in the process of high pressure torsion forming of the shaped charge liner. Studies have shown that the preparation of the high-pressure-torsion-made shaped charge liner, its density and uniformity is better than traditional medicine prepared by extrusion process liner. Besides, if the material in the high pressure torsion process is under high hydrostatic pressure, thus made charge liner will has a further improved performance. The regularities of the different process parameters we received from the orthogonal test analysis on the distribution of the relative density of the law of non-uniform parameters, from the primary to the inferior ones were as follows: friction factor - Cone Angle - Temperature - extrusion speed - reverse the angular velocity.To improve the mould, and numerical simulation is given to the improved mould, the results show that: improved mould making shaped metal cover by mouth three to the role of compressive stress, which greatly raised the hood shaped mouth as well as the density of the shaped charge liner's overall uniformity, as well as to enhance utilization ot the shaped charge liner at the actual production activities.