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Chapter 1759: Help in the manufacture of parts

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    Qin Baoshan smiled: "If you don't try it, you won't know if it will work. This kind of cylinder is cast, we can make it as long as we control the accuracy of the sand mold, and we don't need to have too much life.  Just enough to get your plane back. If you don't, you'll have to wait for spare parts. After we've tried it, if it doesn't work, it's about as good as it is now, at least not worse.  "

    Major Cromlin nodded: "Okay, then let's try."

    There are many ways of metal processing, the most convenient of which is casting.  As long as the molten iron is poured into the sand mold, after cooling, the sand is knocked off, and an industrial product comes out.  Many low-end products are made by casting.  The cylinders of aircraft and even the entire block of water-cooled engines are cast.  But it is not easy to meet this standard, the engine body has a complex internal structure.  There is also a water jacket inside the cylinder block.  Making sand molds is very complicated, and only the most skilled masters can do it.  Without a qualified sand mold, a qualified airframe cannot be cast.  Of course, in later generations, computers began to be used, and the sand models produced were very accurate.  Now, you can only rely on the craftsmanship of veteran masters.

    Fortunately, this is not the cylinder block of a water-cooled engine, but an air-cooled engine cylinder. The outside is mainly a layer of heat sink, and the inside is a cylindrical shape. The structure is not complicated, but it needs to be embedded inside.  a cylinder liner.  After all, there is no high-end spraying technology for wear-resistant coatings in this era, so it can only be stuffed in with a hard cylinder liner that has been repeatedly polished.  The technical difficulty of this cylinder liner is even greater.  Only the most professional master craftsmen can do it.  This also requires specialized processing techniques.  Now it is already difficult to machine just one outer cylinder.  If it is necessary to reprocess the cylinder liner inside, it will be even more difficult.  Can the Eighth Route Army do this well?

    If it was in the past, then Qin Baoshan really didn't have much confidence.  But it is different now, because under Qin Baoshan's suggestion, the Eighth Route Army Military Factory has begun to try to manufacture small air-cooled engines.  Although it is still in the exploratory stage, it has not been successfully manufactured.  But some of them are already trying to be manufactured.  Cylinders and cylinder liners are essential parts of an engine.  Lu Da and Xiong Zheng are both studying.  Now the engine of this aircraft is just an enlarged version of that small engine.  Although the performance is powerful, the basic structure of the engine is actually the same, which can be used to practice hands. If it can be successfully manufactured, it will also mean that the military manufacturing level of the Eighth Route Army has reached a new level.

    The rotten parts were dismantled, and Qin Baoshan sent someone to give them to Xiong Zheng and Lu Da.  This part was handed over to them.  Then Qin Baoshan waited to receive the goods.

    Of course both Lu Da and Xiong Zheng knew the importance of this matter.  If the Eighth Route Army can produce these parts, then these spare parts for American bombers will be handed over to the Eighth Route Army for production in the future. Although everyone is a friendly army and they are all for the same goal, these parts are all costly.  The Eighth Route Army can't give them the raw materials they use to make weapons to make these equipment, but they still give them away for free.  Even without talking about money, it would be very good for the Americans to provide them with some supplies in exchange.  There was nothing technically difficult about either of them.  In the evening of that day, the parts produced by the military industry department of the Eighth Route Army had already been delivered.

    Looking at the brand-new parts and the dazzling metallic luster, the Americans were very surprised. Major Cromlin reached out, weighed it back and forth, touched it again, and then nodded.  It doesn't matter how rough the outside is, but the inside must be smooth enough. After all, for an engine, the most important thing is the piston and cylinder.  The piston reciprocates back and forth inside the cylinder, and the friction between the two must be smooth enough.  The first engine needs to be run-in. The so-called run-in mainly refers to the break-in of the piston and the inner wall of the cylinder.  Of course, with the advancement of machining technology, in a few decades, after the engine is assembled, it will have been precision polished on the production line.  This does not need to be carefully run-in, as long as it is used normally, there will be no problem.

    Major Cromlin is not a professional. At this time, the professional American technicians on the side started to do it, except for touching the inner wall with his fingers.  Pick up the vernier caliper again to measure this part.  After taking some measurements, he finally gave a thumbs up.

    "Although we don't have advanced processing equipment, we have first-class technicians." Qin Baoshan said ostentatiously: "These are all handmade by us. I don't know if they can reach the level of American industrialized assembly line production.  After the engine is on, it is still no problem to fly back. After flying back?, you can disassemble it and send it to the continental United States for testing.  If it can meet your needs, we will produce these parts for you in the future.  "

    Because ground transportation is very difficult, these parts need to be transported by Americans by plane.  That is naturally very inconvenient.  If the Eighth Route Army can produce these parts here and save them from transporting them back and forth, it will definitely be good news for them.

    So the American technicians nodded again and again: "We will get in touch with the rear and ask them to conduct a test. I hope that the parts produced by the Eighth Route Army here can meet our needs."

    Something similar to the smashing of the cylinder of an aircraft engine will definitely happen again in the future. After all, when the enemy fighter jets are intercepting, they are shooting at the weak spots of the American bombers.  The engine is the weakest point, and losses are sure to be most common.  Repairs are inevitable in the future.

    The American technicians have agreed and approved the performance of this part, so this part was installed on the plane.  Now the big guys are even more impressed, the precision of this part is very high, it is completely the same as the parts produced by themselves, and the assembly has not encountered any problems.

    "It's a pity that we can't produce aircraft skins, otherwise, we can replace the damaged aircraft skins for you here." Qin Baoshan continued.  (Remember the site URL: www.hlnovel.com
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