正文 52、求助网络大神(第2页/共4页)
;“嘿，神枪，还是九节神枪。老铁你可真是个顶级的玩家啊”胖子惊喜不已，他是一个古代兵器发烧友的群主，整个群有三千多人，分布全国各地，都喜欢玩盔甲，玩兵器。
“瞎玩的”杨凡谦逊的说。“怎么称呼”
“吴华，老铁你呢”吴胖子问道。
“杨凡”
“这是你自己铸造的吗”吴胖子真的很专业。“看样子冷却时间不长，这两天做的吧”
“还真的用火药实验的，嘿嘿，老铁你真会玩，这要是被泼波勒发现了，事情大了。”
“你不会举报我吧”
“看您说的，您是金主我哪能呢，再说都是玩这个的发烧友，都理解。”
“你能看出我的问题出在哪里吗，为什么总是炸膛。”
“你用的是古法吧。炸裂的截面图我放大看了。看品质使用的土炉子自己炼铁，泥模翻砂铸造，啧，全套哇，真会玩。”
“我就是想用古法制造古代火器，这样才原汁原味，才有意思。”
吴胖子发来一个大拇指，然后一个图像不停地跪拜。
一行红色大字，大神请受我一拜。
“我告你原因，非常简单，但是外行肯定弄不明白。”
吴胖子娓娓道来。
原来泥模有个问题，这玩意需要很长时间才能彻底阴干，但是不论怎么阴干里边都有水汽。
等铸造时，铁水一加热会快速把泥模蒸发干，但是蒸发的水汽会有一部分进入铁中。
就会形成气泡。有气泡就不结实，会强度大大下降。就会炸膛。
另外为了保证不炸膛，枪管做的比较厚，这样冷却时，内管壁和外壁散热条件不一样。
首先，内管壁面积一定小于外管壁。散热面积小，散热慢。
另外内部通风不好，里边不好散热，实际上总是外边凉了里边才会凉。
这样冷却速度不一样，产生应力，造成枪管内部肉眼看不到的开裂，形成裂缝隐患。
而从机械性能上来说，枪管内部是承受火药镗压的，必须最硬，最耐磨损。
而从铸造特性上来说，金属冷却的越快就越坚硬。这就造成了外硬里软。
而枪管需要的是内硬外软。外边软可以增加韧性，对防止炸膛更有利。
“那有没有办法解决呢”
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