| The direction to open breechblock of most traditional gun is downward, so it has toreserve some room for the breechblock’s opening. When this construction applied to navalgun, it will have some collide because the feeding-ramming system and pitching system underthe breech. To meet the requirement of naval gun, we can overturn the breech, let thebreechblock move up. Nonetheless, the changes of the mechanics regular of breechblock anddrawers are unknown.The aim of this research is to study the changes of big caliber gun which has thedirection to open breechblock changed. The result of this paper can help the designers todecide the direction of breechblock opening, also contribute to the job of converting theground artillery into naval artillery.There are three approaches in this research to finish this study, we can make theoreticalcalculations, multi-rigid-body dynamics simulation and finite element analysis. First, get theextracting force by elastic-plastic mechanics and FEM. Second, build3D models by Pro/Esoftware and expert the models. Third, import the models into ADAMS, and then establishthe virtual prototype of the recoil part of gun. Fourth, make a study of the variations after thedirection of open the breechblock changed. Fifth, get the stress of cam, crank, extractor, leverof breechblock closing and plate of breechblock opening, etc.The result of multi-rigid-body dynamics simulation shows that the maximum velocity ofextracting will reduce1.4%if the direction of breechblock opening changed, also themaximum velocity of opening breechblock can reduce about3.4%, but the final velocity ofbreechblock has a big rise. The result of finite element analysis manifests the stresses of thecomponents of breechblock opening mechanism and extraction mechanism are different ifthe direction of breechblock opening changed.The results of this research show that different directions lead to different shootingcharacteristics. But the change is tiny and the strength of material is guaranteed. |
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