A powerful waterjet armored raft drawn on a blackboard is just a design prototype, and there are many details to consider in order to turn a design prototype into a product. Pen % fun % Pavilion www.biquge.info

One of the difficulties is the sealing of the bellows, no, now called the "water tank", the piston and the log box.

It is in principle feasible to use leather as a sealing material and lubrication with grease lubrication. In practice, reliability is a concern. The piston keeps reciprocating in the box, and the leather keeps deforming, and the skin bonded with fish glue is easy to fall off.

Sun Yi's first reaction was to use screws to nail the leather to the piston with a pressing strip in addition to the fish glue bonding.

Screws were a novelty in the Ming Dynasty. Not to mention screws, they are nails, which are rare objects in the Ming Dynasty.

So far, Sun Yi has not found that the craftsmen in the ironwood have used nails, and all their carpentry links are cemented with mortise and tenon joints. On the one hand, Sun Yi sincerely admired the superb mortise and tenon craftsmanship of the craftsmen of the Ming Dynasty, and on the other hand, Sun Yi deeply regretted that the carpentry work of the Ming Dynasty became extremely complicated because of the lack of metal fasteners.

In the victorious battle against the bandits, Ironwood's electric three-eyed gun exposed a problem: the connections between the battery and the copper wire, and between the wire and the wire, were all hinged, and the wires often became stiff after repeated several times, and the contact was poor. In later generations, the most effective and strong way to connect wires was through the crimping of binding posts and metal nuts with metal threads.

Metal bolts and nuts, Sun Yi has arranged for blacksmiths to imitate, and the sample is a travel-sized toothpaste tube that Sun Yi has used up.

Now that the water-jet "water tank" has put forward higher requirements, Sun Yi hurried to the two blacksmiths, Niu and Xue.

At first glance, Sun Yi saw that the blacksmith's bellows were really different, like a wooden cannon, much longer than the bellows for cooking. The upper and lower sides of the log box are planed, the lower plane is connected with the ground, and the upper plane is placed with the tool box.

The two blacksmiths were as busy as ever, in addition to the daily ironwork in the old camp of the woods, the two were also responsible for the production of iron needles and copper wires, and recently added the study of screws and nuts, and the two specially recruited a few apprentices.

The blacksmith first carved out the master mold of the screws and nuts out of wood, turned the sand to make a model, poured the rough workpiece with cast iron, and then used the steel sand to polish it repeatedly to make several iron bolts and nuts.

When the iron bolt reaches the hands of the blacksmith Xue, it becomes a taper, and the softer hollow round piece made of copper or tin is squeezed through the taper stiffly, and the inner wall of the copper or tin piece will leave threads, so it becomes a nut.

In the same way, the copper rod is squeezed through the iron nut, and the threads on the copper rod are extruded, so it becomes a bolt.

But how to fix the copper bolts to the iron can battery has become a headache for the two blacksmiths.

Solder it with tin, the strength is too low. In the hand-to-hand combat of Qingshanzui, the three-eyed gun became an iron stick, and the actual combat required the most solid fixing method.

Sun Yi had no choice but to take out almost all the batteries and connect them in series and parallel to make a low-voltage and high-current battery array.

The copper bolt is connected to the anode, and the iron can of the battery is connected to the cathode.

When the copper bolt is pressed against the can with a wooden board, a dazzling electric arc jumps out, quickly melting the copper-iron contact surface, and under the action of pressure, the two are firmly welded together.

In other words, spot welding in later generations.

In order to protect the battery array, Sun Yi specially made a large capacitor.

To say that this capacitance is large is not only to say that it has a large capacitance, but also to say that it is large in size.

According to the principle of electricity, the larger the area of the two poles of the capacitor, the greater the capacitance, so Sun Yi asked Xue Blacksmith to make two large copper foils.

The smaller the distance between the two poles of the capacitor, the greater the capacitance. In order to get the smallest distance possible, Sun Yi used lacquer as an insulator between the poles, applying a thin layer of lacquer to one side of the copper foil, and then pressing the other copper foil tightly.

Huge capacitors sit between the battery array and the welded workpiece, separating the two. For the principle of capacitor, Sun Yi made a simple analogy, a capacitor is a kind of battery, first charged, then discharged. Therefore, craftsmen naturally imagined the capacitor as a kind of container, and how much electricity was poured in, how much electricity would flow out.

The results of spot welding are excellent, and the consumption of spot welding is intimidating - the precious tin can battery cannot withstand many spot welds before it runs out of power.

Now if Sun Yi wants to extend the thread to the nail, he must have the nail first.

The semi-finished iron wire, which is a semi-finished iron needle, is cut into two inches long, one end is sharpened, the other end is smashed out of the iron cap with a sledgehammer, and then the semi-finished product is placed in a pot like an iron needle, and after it becomes hard, it becomes an iron nail.

It's just that hand-grinding the tips of iron nails is really time-consuming and laborious.

The next step was to turn the iron nails into screws, and Sun Yi and the blacksmiths were stuck.

Whether it is in the finished state of the iron nail or the semi-finished state, there is no way to tap the thread on the iron nail.

Not to mention the thread, even the indispensable groove on the cap of the screw, they can't process it.

It's still an old problem, there were too many iron impurities in the Ming Dynasty, which made it too brittle to make such a fine thing.

There are some high-quality Tiesuni, but they are reluctant to use them to make screws.

It was the product of the two electrolytic jars that Sun Yi arranged for the little pomegranate to take care of. The product of an iron can is electrolytic copper, and the product of an iron can is electrolytic iron.

The purity of electrolytic copper and electrolytic iron is 99 . More than 9%, in order to distinguish it from the refined iron and refined copper in the mouths of blacksmiths, Sun Yi called it pure iron and pure copper.

Sun Yi's pure iron is extremely soft, and there is no pressure to attack the thread, but Sun Yi's pure iron is too precious, and the world is only a little more than two catties.

Sun Yi only gave the two blacksmiths a little bit of pure iron, and let them heat it and beat it into thin iron foil and cut it into thin strips.

The iron foil strips and copper foil strips were pressed together, and multiple points were welded together by spot welding, and Sun Yi got several copper and iron bimetal sheet thermometers.

These bimetal thermometers were sent to the pharmaceutical factory that boiled nitrate, and the pharmaceutical factory needed to master the water temperature; Hu Lu and Mizi sisters, who brew nitrate, each need to master the appropriate temperature of nitrifying bacteria; Shennongyuan, the five grain hall in charge of agriculture, Sun Yi asked them to start recording the daily temperature and rain now, and combine it with the growth of crops to compile the lunar calendar, simply put, what time to plant and what time to harvest in this place of Langshan River, etc.

Using such precious pure iron as screws, Sun Yi said that there was no door.

It's easy to make copper screws out of thick copper wire, but unfortunately the copper is too soft to be useful.

In the end, the three of them discussed and decided that the only way to use copper bolts and nuts was to drill holes in the pistons and tabs of the "tank", pass through the bolts and tighten the nuts.

Sun Yi let out a long sigh, it seems that Tiemu is still stuck in the Bronze Age, and it is still far from the Iron Age.