第288章 工艺
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第288章工艺(第1/2页)
刚进这炮作坊门,陆安就到感觉不一样了。
炮作坊的院子比器作坊还大,人更多,但里面此刻静悄悄的,没有打铁声,也没有吆喝声,只有偶尔传来的金属摩擦声和低沉讨论声。
院子里搭着好几个木棚,棚子下面摆着大大小小的炮管、炮架零件、模具和工具。
靠墙是一排木架,上面整整齐齐地码着各种规格的铜锭、铁锭和锡锭。
最引人注目的,是院子中央那一排火炮。
那是炮作坊之前研制失败的实验样炮,作为实验推敲,此刻作为警示,暂时还未融了重铸,这大大小小好几门,一字排开,裂痕交错,看着格外触目惊心。
每门炮旁边都立着一块木牌,上面用炭笔写着失败的缘由,“沙眼过多”、“炸膛碎裂”、“炮身变形”、“壁厚不均”、“受力失衡”等等。
有的木牌上还画着简单的示意图,标注着裂纹的位置、走向,一笔一划都透着数月试错的艰辛。
炮作坊内,众工匠瞧见孙云球带着陆公子来了,纷纷停下讨论,朝陆安躬身行礼。
陆安抬手温声让他们随意,然而这些工匠多来自孔有德的铸炮造铳团队,属于俘虏从良转正。
此刻虽见陆安很客气,但他们还是拘谨地垂手立在一旁,忐忑地等着对方检视这几个月的制炮进度。
陆安缓步走过去,弯腰看向最近的一门样炮,那是一门铸铁炮,炮身布满细密裂纹。
旁边木牌上写着:“铁为白口铁,性硬且脆,试射膛内冲力一起,即刻炸裂。”
他又走到第二门旁,这门是铜锡青铜炮,却因锡料配比失当,炮口微微鼓胀变形,木牌上记着:“铜七锡一,锡料过少,青铜硬度不足,连射数发,炮口受热变形。”
第三门是熟铁锻打炮,炮管上不是砂眼,而是一道道细微的锻接缝隙,木牌写着:“锻合不严,管壁存隙,试射炸膛,不堪野战。”
陆安轻轻摇头,直起身来,眼底对这些试错已是了然。
孙云球连忙上前,引着他走到最边缘的一门炮旁,这是军工局最新的实验样炮。
与前面那些残次品截然不同,最新的炮身匀称,线条流畅利落,通体泛着青铜独有的温润光泽,炮管光滑无裂,更无半点儿砂眼。
“这是最新的样炮,按公子给的图纸,这是反复修改后,眼下最贴合,最成型的一门。”
孙云球抚摸着炮身,随即又皱起眉,“然而,依旧达不到公子要求的射速,离每刻四十发的射速还差不少。”
他推了推鼻梁上的眼镜,细细讲解起这数月的艰辛推进:“起初咱们踩了不少坑,先是材料的问题,送来的生铁多是白口铁,硬脆杂质多,一受膛压就裂。
而纯铜太软,根本不能铸炮,之前试铸纯铜炮完全是走了弯路,据新来的制炮师傅说,西洋红夷铸炮向来用铜锡。”
陆安点头,他这时候也才回忆起,好似拿破仑的速射炮的确也是全铜炮。而事实上,全铜炮相对铁炮和铁芯铜体来说,铜炮安全性最高,急射后温度更低,耐用性强。而铁芯铜体炮优势只是成本更低、重量轻上二三成的样子。
他拍了拍身边的炮身,语气多了几分笃定:“后来根据不断研究实验,咱们弃了复合结构,回归红夷野战炮的正途,用铜锡青铜整体铸造。
(本章未完,请点击下一页继续阅读)第288章工艺(第2/2页)
滇铜配滇锡,按铜八锡二的配比熔炼,如此硬度与韧性刚好平衡,既耐压又不易变形,重量也能接受,能适配公子要求的野战机动。”
“我们现在铸铜时还在铜水表面加盖木炭,隔绝空气,减少气孔沙眼,这才铸出这般无裂无砂的炮身。”
陆安微微颔首,心里清楚,这些看似简单的改进,在当下的南明,已是破天荒的突破。
他给出的只有记忆中拿破仑炮的模糊图纸和核心思路,真正把纸上谈兵变成实物的,还是孙云球和这些登莱火器局出身的工匠。
孙云球接着说起铸造工艺的弯路,语气里满是感慨:“然后传统泥模太粗糙,全靠工匠手感,炮壁往往一边厚一边薄,膛内受力不均,连射定崩。
炮耳位置也全凭估算,俯仰失衡,根本没法精准瞄准。而且若是铸完直接风冷,内里受力积攒,炮身暗藏裂纹,试射几发也会碎。”
他扭头看向身旁的工匠们,声音里带着十足的敬意:“多亏了这些老师傅,他们不愧是孙元化大人当年在登莱培养出来的,很多已是那些老师傅的二代传承。
得了老一代真传后,还跟着葡萄牙人也学了几手西法的铸炮,可与我们铸炮法相配合,又懂规矩、愿创新。
他们给我提议说用白泥、细沙、桐油和糯米浆制模,用木规、吊线精准卡炮壁厚度、定炮耳位置,不去凭手感估算。
如此铸好的炮也不直接风冷,而是埋进木炭小火坑,文火慢烘七天退火,慢慢降温消弭内里的受力。这般下来,炮身壁厚均匀了,炮耳位置准了,再也没出现过无故炸裂的情况。”
陆安听罢,当即转身看向那群恭立的工匠,朗声笑道:“诸位师傅这数月技术攻坚,日夜不休,辛苦了!本月参与制炮的师傅,每人加工钱二两!
到这个月末由孙云球统计,对这门样炮有突出贡献者,额外赏猪肉五斤、母鸡两只,再发一匹布!”
工匠们先是一愣,随即齐刷刷跪地磕头,声音激动得发颤:“谢公子恩典!谢公子恩典!”
他们世代为匠,向来被视作贱役,何曾有人这般看重他们的手艺、体恤他们的辛劳,一时间满工坊都是感恩的呼声,皆是亢奋。
孙云球笑着看着这一幕,等工匠们平复情绪,他才又说起眼下最棘手的炮膛精度:
“以往造炮,炮膛全靠凿子粗略修形,内壁凹凸不平,气密性极差,炮弹与炮膛间隙忽大忽小,要么卡壳要么漏气,射程近、装填慢,速射根本无从谈起。”
他指向院子角落的一台装置,那是木支架架着一根长铁杆,前端装着熟铁包钢的镗头,后端连着脚踏转轮与传动齿轮:
“这是我参照西法镗炮工艺,做的脚踏式旋膛装置,匠人脚踏转轮带动镗杆旋转,再配合推拉,加水加金刚砂打磨,比纯手摇省力十倍,效率也高得多。
这般打磨后,炮膛内壁光滑,口径统一标准,气密性大幅提升,射程和装填速度都上来了。”
陆安上前细看,心中感慨,任何超越时代的技术,从不是什么张嘴闭嘴一说就成了的。
更不是一蹴而就的,因为每一步、每道工序都需突破当下的技术壁垒。
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