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山西潞安府,群山环抱中的一个小村落。胡老铁匠的院子毫不起眼,甚至有些破败。老头须发皆白,精瘦黝黑,正叼着旱烟袋,眯着眼看陈瑜带来的皇家商会腰牌和那根布满沙眼的样品枪管,半晌没说话。

“胡老,此乃军国重器,关乎边关将士性命,社稷安危!”陈瑜言辞恳切,“若能解决这沙眼顽疾,您便是大明功臣!皇家商会定有厚报!您有何要求,尽管提!”

胡老铁匠吐出一口浓烟,沙哑着嗓子:“功劳?厚报?老汉不稀罕。老汉只想问,侯爷可知,百炼钢如何成?”

陈瑜一怔:“反复锻打,折叠淬火,去芜存菁?”

“那是寻常!”胡老汉嗤笑一声,拿起陈瑜带来的那根失败枪管,“你们这法子,叫‘模铸’,图快,省力!但铁水里的‘气’,模子困不住,就憋在里面成了沙眼!想要管子密实无眼,得像打刀一样,给它‘喂’出来!”

“喂出来?”陈瑜和随行的大匠都愣住了。

“看好了!”胡老汉起身,走向他那座不起眼的小炉子。他没用现成的铁锭,而是选了几块皇家商会带来的上好精钢料,丢入炉中。他没有急着浇铸,而是等钢料烧至白炽,近乎融化却未完全成液态时,用特制的长钳夹出,放在一个特制的、带凹槽的铁砧上。

“锤来!”老汉低喝一声,他那沉默寡言的儿子立刻递上一柄造型奇特的短柄方锤。老汉抡起锤子,并非猛砸,而是用一种极其精巧、快速而密集的力道,如同雨点般敲击在那炽热软化的钢料上!每一次敲击,都伴随着钢料内部细微的“嗤嗤”声,仿佛在挤压出什么。

“这叫‘喂锤’!”老汉一边敲打,一边解释,“趁它软乎,把里面的‘气’一点点捶打出来!顺着劲儿,不能急!就像揉面,把气泡揉出去!”

随着密集如鼓点的捶打,那炽热的钢料在凹槽铁砧上,竟真的如同面团般被“揉搓”着,渐渐被捶打延展成一根中空管子的雏形!锤点所过之处,钢料表面光滑如镜,绝无气泡孔洞!

陈瑜和天工院的大匠看得目瞪口呆!这完全颠覆了他们对“铸造”的认知!这分明是将“锻造”的技法用在了制造管状物上!

“还不够!”老汉将初步成型的管胚再次加热,这次,他换上了更细长的冲子和芯棒。他将通红的管胚固定在特制架子上,将涂抹了特殊耐高温油脂(防止粘连)的芯棒插入管胚中心,然后用不同尺寸的冲子,由细到粗,顶着芯棒,一锤一锤,极其耐心地从管胚内部向外“撑”!

“嗤…嗤…”每一次冲压,管胚内壁都发出轻微的挤压声,管壁被撑得更加均匀薄透,内壁光滑度也进一步提升。反复数次加热、冲压、修整后,一根长约三尺、内壁光滑如镜、通体浑然一体、绝无丝毫沙眼的精钢枪管,赫然出现在众人面前!

“神乎其技!”天工院的大匠激动得声音发颤,抚摸着那冰凉光滑的枪管,如获至宝。

胡老汉却还不满意。他眯着眼,拿起一根特制的、头部镶嵌着金刚砂的细长钢钎,固定在简易的旋转架上。然后,他手动摇动转轮,让钢钎匀速旋转,同时小心翼翼地用金刚砂钎头,开始在那光滑如镜的枪管内壁上,刻画出一道道极其细微、均匀、带着特定旋转角度的螺旋凹槽!

“这…这是何意?”陈瑜这次是真看不懂了。

“这叫‘膛线’!”胡老汉眼中闪烁着老工匠特有的狡黠光芒,“侯爷您说这火枪打不远,打不准?有了它,射出去的弹丸,会像陀螺一样自己转起来!转得越快,飞得越直,越稳,越远!穿透力也越强!老汉年轻时给猎户修过鸟铳,刻上几道浅槽,那准头,啧啧,天上飞的雁子都能打下来!”

膛线!陈瑜心中巨震!这老铁匠竟凭经验摸索出了膛线的雏形!这绝对是意外之喜!他强压下激动,深深一揖:“胡老真乃神人也!此技于国于民,功莫大焉!还请胡老携家眷入京,主持‘神机坊’!待遇从优,子孙皆可入天工院!”

解决了核心的枪管问题,燧发枪的研发势如破竹。击发机构在陈瑜借鉴燧石打火原理的指导下,由天工院的巧匠们反复优化,可靠性大增。木制枪托的加工对皇家木器坊来说更是小菜一碟。

很快,第一批十支真正意义上的、带有膛线的燧发枪样枪诞生了!枪身线条流畅,钢制部件泛着幽蓝的冷光,木托打磨得温润贴合。“正德一式·火神铳”!

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