第七十八章 铁芯铜体大炮
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火炮作坊失败了几次，最后在李植的指导下，用了二十天时间摸索出了技术，成功使用铁坯造出了铜炮。龙腾小说ltxsba.com这种新方法造出的铜炮炮身上没有蜂窝气孔，质量要远远好于泥坯铸造的铜炮，不但提高了铸炮的成功率，而且降低了成品炮的炸镗概率。
而且用铁坯铸炮铁坯可以重复使用，省却了铸模时间，铸炮速度大大加快了，三天就能铸造一门铜炮。
不过李植不满足于此，李植又让匠人们铸造铁芯铜体大炮。所谓铁芯铜体大炮就是先用熟铁铸造炮芯，待炮芯冷却后用铸模包裹炮芯，在铸模中炮芯外面浇铸一层青铜。
这种造炮方法是明末中国的一项发明，可惜在原先的历史上没有得到广泛推广。明末中国的铸造技术并不落后于西方。明廷和后金长期的战争中产生了对先进武器的需求，铁芯铜体大炮便应运而生。这种新式火炮能以较少的材料承受较高的膛压，降低了火炮的重量。同时熟铁熔点较高耐磨性较好，因此这种技术提高了火炮的寿命。不仅如此，因为青铜较为昂贵，铁芯铜体炮节约了用铜，还降低了铸炮成本。
李植让炮匠们按这种方法摸索、制造火炮。
李植选择的第一种野战火炮是这个年代的米宁轻型长炮，这是一种84毫米口径，使用六磅炮弹，炮身长两米的前膛炮。这种火炮的直射距离是400米，最大抛射射程3200米，标准炮重900斤。不过李植使用铁芯铜体技术铸炮，炮重可能可以下降不少。
选择这种火炮的原因是火炮的重量和口径都比较适合。李植以后面对的战斗大多数都是和步兵骑兵混合的敌人进行野战。无论是东北的后金还是西北的流贼都擅长野战，较少在坚城中死守。李植不需要能够摧毁敌人要塞的重炮，而是需要能够配合步枪兵野战的轻型火炮。
这样的需求下，六磅炮就比较适合了。
九百斤的火炮还能用铁芯铜体技术改造得更轻一些，这样可以用马车拖拉，运输也比较方便。
炮匠们要进行各种试验制造，到造出符合李植要求的成品估计还要一段时间。李植又去tj雇佣了五个铁匠到范家庄，让他们给五个炮匠打下手，做学徒。然后李植就把任务交给炮匠们，自己则去忙别的事情了。
崇祯八年一月十一日，范家庄新城的夯土城墙完工。
新城墙周长三千米，包裹着整个范家庄新城。城墙高五米，底宽四米，顶宽三米，每二十米筑有向外突出三米的马面一个。城墙外有护城河，护城河宽五米，深三米。
城墙内外包砖，外围设有雉堞垛口，不过这些目前还没有修好。城墙上设有十六座重炮炮台，每一面城墙上各有四座。这些炮台上需要的重炮，就等待铸炮作坊以后生产了。
城墙东南西北四个方向上建有四座洞式城门，都已完工。四座城门东曰熙春，南曰崇文，西曰庆丰，北曰尚武。四座城门上都建有城楼，城楼二层，高五米，使用重檐歇山屋顶。楼顶为灰筒瓦、绿剪边，绿琉璃列成的楼脊上装饰兽头。楼体外侧均设置有箭窗，远望十分威武。这个时代并不太平，百姓们都期望有城墙的保护。城墙合龙的这一天，范家庄的百姓们不少都拿出了鞭炮出来放，十分欢喜。
城墙合围了，选锋团两千士兵的土木劳动就告一段落，开始训练队列、格斗技巧和野外行军。部分分到步枪的连队则每天下午到靶场练习射击。
夯土城墙合围了，李植就准备正式把家搬到范家庄副千户官厅里了。这几个月李植和弟弟李兴为了工作都住在范家庄，母亲郑氏半个月也见不到两人一次，十分想念两个儿子。如今城墙已成范家庄更安全了，李植便准备把老母亲也接到范家庄。
李植带着四个家丁，骑着马匹，驱着一辆马车回到了井边坊。一路上百姓看到西边来了个武官，赶紧让开道路回避，站在道路两边看热闹。
“哟，那不是李成的儿子李植吗？”
“李植当这么大官啦？瞧那补子，那是五品武官啊！”
“嗨，你们不知道啊，李植在西边修了一座城，有县城那么大，叫做范家庄！”
“真是风水轮流转啊，去年这个时候李植还欠银子还不上呢！”
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