第一百零二节 铸炮(一)
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也就是说，在17世纪早期，只要发展生产出这样的小型后装炮就完全就足够了。在面对当时的任何海军海盗都已经拥有压倒性的优势。
“那我们直接仿制92步兵炮不就得了？”听了这番线膛后装炮的好处的阐述，有人说，“92步兵炮75mm口径，最大射程2800米，正好符合上面说的性能。而且92炮的重量才210公斤，比预估的500公斤都小。”
“92步兵炮的问题是倍径太小了，才6，造成它的初速过小。作为海军炮来说，弹道越平直越好。92步兵炮給陆军用很不错。”
王洛宾提议，这种海军炮可以采用armstrong炮的结构，它是一种比较成熟可靠，工艺却又相对简单的后膛火炮。与之前的多种后膛炮、前装线膛炮相比，特色在于为后膛炮导入了螺纹炮闩和闭塞具。取下炮闩以后的armstronggun和一门打通了炮尾的前膛炮非常接近。身管的铸造加工工艺也类似。
armstrong的缺点是采用早期型的闭锁设计，结构非常复杂，稳定性低，故障率高。穿越者自然不会一味的模仿，可以采取螺纹炮栓，技术水准也没有太高要求，基本上做的出螺丝就应该做的出来。
“说得简单，”萧白朗泼了一盆冷水下来，“谁知道怎么造炮的？我看大家也就看过几本书吧？92步兵炮就不用说了，都是现成的无缝管做得，现在上哪去找这么粗的无缝管？”
“自然以铸炮为主了。毕竟没有大型锻机，如果要采用深钻法的话还要制造专用的设备。”林深河说，“我倒是在美国铸过炮，不过都是滑膛炮。”
白羽说：“其实我担心的不是大炮能不能造出了，而是弹药问题。前面的后膛炮好处的种种说明，这些我都同意。但是有一点似乎没说清楚――后膛炮的炮弹，这个比后膛炮本身要难造多了。只是实心穿甲弹还好说，如果是榴弹、榴霰弹该怎么造？尖型炮弹弹体制造要用到金属延伸工艺怎么解决？还有炮弹的引信，都是问题。”
姜野说：“炮弹弹体制造没什么问题，我们的设备是造得出来的。”
“那只是造得出来，不等于能够批量制造。一条子弹的生产线都有30多台专用设备，炮弹需要得更多，工业能力显然还上不了这样的生产线。”
“没错，”展无涯承认，“而且材料也不见得能过关。”弹体不管是采用冷拔还是热拔，都得有专门的圆棒料，还需要制造专用设备。倒不是说工业部门做不到，而是这需要一整套工业体系才能支持，否则成本高得难以想象。
“不，老式的尖形弹没这么复杂的，”林深河说，“早期后膛炮弹弹体是铸铁的，外面包铅，用简易式碰炸引信，弹内装黑火药，用黑火药包作发射药，不带药筒，也没有底火，发射的时候也是用点火具点火。1890年前生产的炮弹大多属于这一类。这种炮弹用在92步兵炮是不行的，用在armstrong炮上绝无问题。”
线膛炮炮弹之所以要包铅，是为了将炮弹弹体嵌入膛线内，铸铁或者钢太硬，会严重磨损膛线。所以即使现代的炮弹也是钢制弹体（直径小于膛线内径）和铜制弹带（直径略大，可以嵌入膛线）。
王洛宾说：“但是包铅是有些问题的，我记得当年armstrong炮在短暂装备以后被除役，大英帝国走回前装线膛炮路线的原因之一就是armstrong炮开火时，由于热镀铅与铁之间附着力不好，撕脱的铅碎片会散布在炮口前短距离上对己方士兵造成伤害。”
“这个我觉得不是特别严重的问题，”林深河说，“我想机械部门的人是能够想出办法来解决的。”
“另外，我个人觉得，滑膛炮也可以造。”林深河说。
滑膛炮工艺简单，对材料也无太大要求，如果钢材不够用，可以直接使用铸铁。armstrong炮这类的早期后装线膛炮和滑膛炮在铸造工艺上相差无几。除了林深河之外谁都没有铸炮的经验，用比较简单的滑膛炮来练手，熟悉铸炮工艺是个好的选择。
“我建议商业部门把滑膛炮列入外销商品目录。葡萄牙人现在已经成了大明的军火商，这个银子不能让他们赚去了！”
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