章一一二 不会炸膛的炮

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    路上,奥德玛跟苏文倒起苦水,最大的问题就是铸炮模具不过关。
    “团长,我们费好大劲塑好模具,可钢铁一浇进去就变形。”奥德玛皱着眉头,“火山灰烧的耐火砖能扛住高温不假,但精度实在达不到铸炮模具的要求。光是为调整这模具的配方,我们就折腾好久了!”
    苏文沉吟道:“之前不是找了两个会造钟的铁匠吗?他们新搞的那种砂质模具也不行?”
    队伍规模扩大后,苏文确实从新招揽的铁匠里物色到了两位有铸钟经验的熟手。他对此其实寄予厚望,因为教会大钟的铸造精度和厚重程度,理论上是能迁移到铸炮上的。
    可惜,听奥德玛的意思,这个方法也不尽如人意。奥德玛解释原因道:
    “团长,钟和大炮的要求差别不小。钟壁有时候相对薄一些,浇铸温度也未必有大炮这么高。更要命的,钟稍微有什么问题,敲击是不会显现出来的,但能敲钟,不代表能塞火药开炮。
    “我觉得核心问题还是,我们没有办法解决气密性的问题。”
    “我们前后试了三批炮,”奥德玛声音里透着无奈,“每次都有形状差异。钟壁相对均匀,炮身却厚薄悬殊得多。
    “这样在铁水冷却凝固时,厚薄部位收缩程度就差了老大一截,热胀冷缩不协调。一旦收缩变形,炮弹和炮膛之间的间隙就会变得不均匀,火药点燃那点力气全从缝隙漏气跑了,炮弹射出去绵软无力甚至炸膛!”
    奥德玛这段时间确实从苏文这里学到了很多知识,讲的都挺科学的。可是就是因为他讲的这么科学,苏文听着,心中才愈发感到棘手。
    一行人很快走到了铸炮试验区。那两位造钟铁匠正蹲在那里,比划着讨论如何改进模具。苏文默不作声地靠近旁听。
    他们的核心思路其实很简单,就是传统的失蜡法:先用蜡精心塑出完美的炮管内壁模型,然后在蜡模外面一层层敷上由火山灰、粘土混合特殊粘合剂组成的外壳泥浆,做成坚固的外范。最后高温烘烤时,蜡模融化流出,就得到了一个内壁光滑的空腔模具。
    但问题也随之而来。奥德玛指出:“这种耐火泥外范在烘烤烧制时本身会收缩变形,最终浇铸铁炮这么厚重的东西,注入滚烫铁水时温差剧烈变化,气孔问题非常严重,炮管的气密性根本无法保证。”
    苏文思索片刻,提出了一个思路:“现在的问题关键在于模具整体太大,一次性整体铸炮必然导致各部分冷却速度不同,收缩变形加剧,模具也容易开裂。那我们为什么不尝试使用铁范分段铸造?”
    那两个造钟铁匠听了都面露茫然。
    苏文继续解释他所知的铁范铸炮法要点:
    “核心是用铁制模具分段铸炮管部件,比如炮膛核心段。铁范能保证每段尺寸精准,冷却时收缩均匀,减少变形。铸件接合面刮平后涂一层草木灰泥浆,既保温又密封,让接缝严丝合缝。
    “最后把分段部件拼合后套上整体,用铁箍紧固成一体,通过螺杆旋紧施加持续压力,使泥浆层进一步压实。靠机械咬合和泥浆密封保证炮膛气密性,应力分散在各段,成品率自然更高。铁范还能反复使用,批量造的部件尺寸也能一致。”
    苏文提出的方法,其实就是清代龚振麟提出的的分段铸造与榫卯定位法。
    “这样,奥德玛,你先去安排一下,我们需要调整一部分产能去生产纯铁的铲模,而不要使用铁包木的铲子。这几天我下午都会过来,我们一起跟进一下铁炮的生产问题。”
    连续几天,苏文在完成梯田定额挖掘任务后,就一头扎进铁厂,和工匠们一起研究铁范铸炮法。
    他们先使用炒钢法,将生铁加热至半熔融的糊状,通过反复搅拌,让生铁中的碳与空气中的氧结合,生成二氧化碳,从而精准地降低生铁中的含碳量,最终得到含碳量可控的低碳钢或熟铁。
    然后根据熟铁,造出熔点在1500度的铁制摸具,并小心翼翼地采用新的分段铁范法铸成了一门试验炮。然而,炮管上依然出现了影响气密性的微小缝隙。这门炮试射了两响后就哑了,炮膛壁上赫然出现了一道狰狞的裂缝。
    万幸当时没有炸膛,否则后果不堪设想。
    苏文面色凝重地检视着废炮,对奥德玛说道:“看来,在我们现有铸造精度和钢材纯净度的极限下,完全避免气孔缝隙和开裂是不可能的。我们现在只能加厚炮壁设计,做一些妥协了。”
    他心中原本计划制造的是标准规格的前膛炮,现在为了保证安全和基础威力,必须做出修改。
    另外,奥斯玛提议用魔化钢来铸炮,理论上能缓解甚至彻底解决这些问题。但苏文还是否定了这个想法。
    “现阶段用魔化钢铸炮太奢侈。”苏文解释道,“魔化钢产量极其有限,我们刚刚打通和蒙德利家族的交易渠道,每一磅魔化钢都是换取领地发展资金的关键。容
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