Great Power Ship

Chapter 218 The Beginning of the Engine

"Be specific!"

Director Chen picked out a few fried soybeans and chewed them in his mouth. His movements seemed casual, but his face was very serious.

Fan Jiahang looked at Director Chen and thought for a while, then picked up the wine bottle and filled it up with Director Chen opposite him, then poured himself a glass, and then said slowly: "You know I'm doing technical and Scientific research, so I'm more sensitive to this aspect, let's talk about their equipment first, I won't talk about other bells and whistles, but I will talk about the two that I think are crucial..."

Fan Jiahang raised his arm and stretched out two fingers: "One is their JJZ-110B vacuum shot peening derusting machine; the other is their JJZ-315C carbon dioxide gas shielded semi-automatic welding machine..."

Director Chen nodded when he heard the words, but said nothing. The meaning was obvious, and it meant to let Fan Jiahang continue talking.

Fan Jiahang continued: "Let's talk about the JJZ-110B vacuum shot blasting derusting machine first, which is a large-scale equipment exported by Zhujiang Factory to Brunei with a unit price of 380 million US dollars. This thing is not only used for simple ship maintenance, but also Just doing rust removal and refurbishment of large structural parts of ships, the actual effect is much more important than simple maintenance!"

Speaking of which, Fan Jiahang picked up the wine glass in front of him, drank it down, and immediately a blush climbed up that fair face, and under the stimulation of alcohol, Fan Jiahang, who was usually more reserved, let go completely: "Because this Another major application scenario of this equipment is the casting process for marine high-power diesel engine shells..."

With the help of wine, Fan Jiahang briefly introduced the casing casting process of marine high-power diesel engines. It turned out that JJZ-110B vacuum shot peening derusting machine can become a very good machine by changing the control program and adjusting the program. Metal grinding equipment.

The biggest application scenario is to deal with the casing of a marine high-power diesel engine that has just been cast.

The shell of a marine high-power diesel engine will leave countless residues on the surface after casting and demoulding. Some of these things are easy to fall off, and some are integrated with the shell for various reasons.

In addition, the shell structure of the marine high-power diesel engine is complicated, and there are many cavities and circuits inside and outside, so it is impossible to remove it by manual grinding.

It is possible to use chemical reagents to deal with it, but the requirements for the relevant proportions are extremely high, because if the chemical reagents are not handled properly, the inner cavity of the housing will be corroded, resulting in the subsequent installation accuracy of the crankshaft and pistons not up to standard, resulting in irreversible failures of the entire diesel engine .

It is precisely because of this that large-scale shot blasting equipment has emerged as the times require.

This kind of equipment can not only polish and treat the inner and outer surfaces of the shell of the marine high-power diesel engine, so as to clean up the residue attached to the surface.

Moreover, it can also relieve the stress of the entire shell, thereby improving the overall service life of the cast shell.

It is precisely because this large-scale shot peening equipment has such important efficacy and performance that it has been favored by major marine power manufacturers once it is put into use.

It was soon rolled out in Germany and France, and thus established the unshakable dominance of Germany and France in the field of marine diesel engines.

In this regard, both the United States and the United Kingdom have to bow down. It's not that these two companies are really bad, but that they have no intention to spend time in the field of marine diesel engines.

Take the United States as an example. High-end people use nuclear power, and generally gas turbines are used as support. No matter how efficient or powerful they are, they are several grades better than marine diesel engines!

As for merchant ships...

The big brother in the United States buys it with money, but don’t the little brothers in France and Germany sell it on poles?
The situation in the United Kingdom is similar to that of the United States. The domestic aviation industry is well developed, especially in terms of aerodynamics. There are several models of gas turbines alone. In addition, submarines also learn from the United States to develop all-nuclear power. There is no need to spin around in diesel engines.

So the huge marine high-power diesel engine market was handed over to Germany and France.

One of the key technologies in the casting process of these two countries in this field is the shot peening process of the shell.

Because the attached residues are cleaned thoroughly, and the overall stress relief is also in place, the accuracy of later installation is more guaranteed, so the failure rate of the finished product is small, the service life is longer, and the difficulty of maintenance is also lower. It is also favored by the market.

In contrast, the country is a little bit worse in this regard.

After all, the production process of the Soviet Union's marine diesel engine in the early 50s is still used in China, and the chemical reagent slag removal process used for cleaning the casting shell.

Generally, the low-power diesel engines of small ships such as torpedo boats and mine-sweeping boats are no problem with this method, because the degree of deformation and corrosion is negligible because of the small shell.

But once it is applied to a high-power diesel engine that can propel several thousand tons of large ships, due to the amplification effect of the huge shell, these errors directly affect the overall performance of the engine.

"Then the domestic manufacturers didn't think about installing such equipment?" Hearing Fan Jiahang's introduction, Director Chen couldn't help but frowned.

"Get the equipment? How do you get the equipment?" Fan Jiahang smiled wryly: "A few years ago, I went to Germany with a delegation, planning to buy their second-hand large shot blasting machine, but do you know how much it will cost me?"

"How much?" Director Chen asked curiously.

Fan Jiahang directly stretched out his thumb and forefinger, and put them in front of Director Chen, shaking them: "800 million... US dollars, and there is no bargaining, that's why they are not willing to sell it to you, because they are afraid that you will learn this technique. , affecting their voices!"

Speaking of which, Fan Jiahang picked up the wine glass and drank the wine that Director Chen had just filled, then touched his mouth and continued: "What's more, what we lack is not only this large shot blasting machine, but also the grinding mill for casting. Tools, special steel for large crankshafts, large high-precision machine tools for machining crankshafts, various high-precision measuring and testing equipment for installation...

None of these can be manufactured by us. Of course, some people will say that the marine high-power diesel engine was a thing more than 100 years ago. The theory is there, so why can’t it be manufactured? "

Fan Jiahang paused for a moment, then shook his head: "The words are very reasonable. The problem is that the things we made are unusable. The same marine diesel engine, put the German stuff in the submarine can prevent the submarine from making extra noise. Ours Woolen cloth?"

Fan Jiahang spread his hands: "Putting it in is like a tractor. It can be heard in the Bohai Sea and in the East China Sea, and ambushes the enemy? The torpedoes are chasing after you with a loud voice. How can you fight? Ah~~ ~
It's impossible to fight at all, and it's a big deal!So this is the sore foot of our current shipbuilding industry, the source of power! "

(End of this chapter)