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第一百零四节 铸炮(三)

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第一百零四节铸炮(三)

现在炮兵小组的人又要面临抉择,到底是采用实心铸造加深钻工艺来制造身管,还是继续采用空心铸造法。龙腾小说ltxs520.com

“下一步我们试验钻孔法吧?不过得先制造一台钻孔机。”机械组的几个人都兴致勃勃。

“钻孔法难了点。”林深河想了想,“效率也有点低,我看可以试试rodmancasting。”

“中心冷却铸造吗?”王洛宾问。

“你知道啊?”林深河有点吃惊,“我以为国内对这方面知道的人不多。”

“个人爱好,纯属个人爱好。”王洛宾想要不是俺在水产大国不比你在腐朽的美帝那么为所欲为,我也早铸过大炮了。

所谓rodmancasting铸造法,就是内模灌水冷却法。

它的原理很简单:生铁浇铸时的冷却速率会影响其机械性能,理论上说冷却速率愈高质地愈硬,理想的大炮是中间(炮膛)最硬,但实际却是相反,铸造大炮的时候却是中间冷却最慢。因为第一外层包住内层,外层不冷里面冷不下来。其次外管的表面积也比内管大。不管是辐射或者对流传导散热,散热速度都是和表面积相等的,所以外面会先冷。而这就使炮管密度的分布不理想,身管寿命大打折扣。

先冷却者先收缩。外层冷却硬化后,里层还没冷却的话,将造成外层比里层更硬,里层的内管可能会形变,或者在里层冷却时产生裂痕之类的。这导致铸炮时的废品率提升,缩减身管寿命,有时候还会影响到火炮的发射性能。

1860年美国南北战争期间,美陆军少校托马斯丁.罗德曼,发明了这一空心铸件工艺,围绕型芯进行铸炮,型芯内部以流水进行冷却,这是一个使炮膛内部先行硬化的方法。这就是所谓的rodmancasting铸造法。这种工艺是早先套筒炮试验合乎逻辑的发展结果。外层金属冷却时向内缩拢,向已经硬化的内层继续加压。这样,发射药的爆炸力就为炮膛四周的整个厚金属层所吸收,而不是层层向外膨胀。在美国内战及以后的20年里,用这种方法制造了大部份美海军的重型铸铁炮。rodmancasting铸造法的最大意义是大幅降低铸造时的炮管废品率,特别铸造重炮的时候。

从成本角度来说,rodmancasting铸造法大幅度减少了废品率,减少了火炮的铸造成本。其次,这种工艺大幅度的增加了火炮的身管寿命,降低了使用成本。

穿越者面对的敌人和潜在敌人,无论从人力还是物力的掌握上,都远大于穿越者。穿越者要战胜他们,就必须控制自己的各种成本。

“这个方法可以试试看,不过这样的话我们要做一个可容水的硬内模,这样就不能用刚才的泥模了。”季无声考虑了下铸造的问题。

“用铁模铸法吧,好像中国人还是第一个用使用的。”

“没错,是龚振麟发明的。他也算个奇才了。”

龚振麟是浙江嘉兴县县丞,本来和军火工业八竿子打不着,但是他有个“素有巧思”的名声在外,鸦片战争期间被两江总督裕谦调到宁波军营专门负责铸炮。

当时中国的铸炮工艺是非常落后的,其方法是:

用水和泥,制成模具,然后范金倾铸,层层笋合。泥模必须烘得干透才行,否则外表虽干,里面湿润,一遇金属熔液,潮气自生,铸成的火炮就有蜂窝,施放时炮筒容易炸裂伤人。烘干泥模往往要一个月之久,如果碰上雨雪阴寒天气,则须两三个月。况且一具泥模只能铸造一尊火炮,随即随弃,不能再用。

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