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第30章 镗线与线膛(2 / 2)

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火枪坊中,赵昰指着那木质的镗床问身边的几个木匠:“这个轴杆能不能刻上螺旋等宽的槽?让刀头在枪管里挖出螺旋的凹槽。”

木匠匠头点了点头“回官家这个不难,找张大幅的纸,在纸上画上斜线,把纸紧包在轴杆上,斜线就成了螺旋线,用凿子细细加工就可以做成了。”

“好,那你等先去做一个。做成了有赏!”,赵昰一听高兴了,还是劳动人民办法多,这丝杆的问题自己想了很久都没想出来,这一问便就有了办法。

赵昰之所以要制作螺旋丝杆,是想要给枪膛刻上膛线。曾经有部着名的纪录片叫《威廉姆斯堡的枪炮匠 》里面就详细讲解了最早的木制镗床爱荷华膛线机的构造和加工原理。其中最难的部分就是这螺旋丝杆的制作。

爱荷华膛线机的主要结构是一根表面加工有螺旋形槽的木制圆柱,丝杆上套一个带圆孔的木档板,圆孔上安装有和丝杆凹槽匹配的木楔子,楔子卡进丝杆的螺旋凹槽里面。把木档板固定以后,拉动木制丝杆,因为木楔的限制,丝杆运动的同时只能同步旋转。在丝杆一端连接刮刀,刮刀被丝杆一起带动的同时就能同步旋转,把直线力(推力)转变为传动力(扭矩),这样就能镗出螺旋形的膛线了。

爱荷华膛线机除了刀头以外全部都是木制结构,和我国古代的卧式镗床除了丝杆和光杆的不同,其他没有任何区别。

很快木匠就拿了一根挖好了槽的圆木棍来,螺旋线非常整齐。赵昰又把木制挡板的样子画了一下,这更简单,木匠一看便会了,不到半个时辰,这时空第一台膛线机便做成了。

把原先镗光的枪管紧固在膛线机上,丝杆在水力曲轴的驱动下,开始缓慢地工作了起来。因为要保持膛线精度,进刀量控制的很小,所以一根0.2-0.5毫米的膛线需要加工大半天才能完成,而一根枪管至少需要四根膛线,那么光是抛光枪膛再加工膛线就需要至少四天时间了。

好在爱荷华镗床的结构简单除了丝杆需要硬木,其他的木材很容易获取。如果需要批量生产膛线枪只需要多制造木制镗床便可以解决。

赵昰对于木匠们的手艺非常满意,赏了匠头让他带人先去加工四百根丝杆。

赵与珞陈惟中在一旁看了半天也不明白,这好好枪管里挖凹槽是做什么用,便开口问道:“官家,这是改良什么?”。

赵昰拿起一支镗光的枪管说道:“你们也都打过维中枪吧?”

“回官家,自然是打过的。”赵与珞和陈惟中纷纷点头。

“那我且问你,你们的准头如何?”

赵与珞和陈惟中面上一红,“我等三十丈外,十不中一。”

“那比我强,我五丈外都打不中。”赵昰自嘲了一下,“这枪虽然威力大,但是准头实在太差,因为铅丸和枪管之间游隙太大,就算拿油布装填也准头有限,着实不便。有了膛线,就可以使用一种新型弹丸,可以避免以上的缺陷。”

“请官家说来听听。”

赵昰点点头,“去房内说话。”。

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