Machine tools, is the mother machine of industry, all kinds of machinery manufacturing, are inseparable from machine tools, if in the words of the time, with machines to make machines, marking the arrival of the era of industrialization. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

It is precisely because of the emergence of machine tools that it is possible to achieve high-precision machining of various parts, and the cutting and processing of various parts are realized through the movement of turning tools.

For example, if you want to make a screw, you can fix the iron block on the machine tool, use the motor to drive the rotation, and the turning tool to cut it next to it, and then you can process it. And to make complex machinery, you need to first cut a plane, then turn around, fix another shaft, continue to rotate, process another surface, and in doing so, it will cause a certain error, and it is impossible to achieve the original accuracy every time you change the shaft. If multiple turning tools can be started at the same time, that is to say, the parts can rotate around multiple axes directly without moving the position, which will greatly improve the production efficiency and improve the accuracy of the machined parts!

And this way is called multi-axis linkage CNC machine tool! Only with electronic computer control can multi-axis linkage be possible! And if you want to process products with special shapes, this machine is the most suitable choice! It can be said that the multi-axis linkage CNC machine tool is the Mount Everest on the industrial machine!

This technology is in the hands of advanced developed countries in the West, such as Germany, island countries and other countries, Batumi has imposed restrictions on such machines, and they must not be exported to the socialist camp! Unfortunately, with the backlash of island countries in the Western camp, these restrictions are no longer insignificant.

In history, the Soviet Union made the businessmen of the island country take risks and exported these machines to the Soviet Union at a high price, and now, there is no need at all, and the Soviet Union can directly import this advanced CNC machine tool to the island country! Machining advanced irregular objects, this machine has an incomparable advantage!

And one of the more important ones is the propeller! And what is at stake is the propeller of the submarine!

The propeller is the only propeller of the submarine, and the pump jet of later generations is not within the scope of discussion, and in the early days, the propellers of the submarine are all three-bladed, if you want to achieve greater thrust, you need to increase the speed of the propeller, in order to be able to stir more seawater, and increase the number of blades of the propeller of the submarine, you can significantly reduce the speed of the propeller, you know, the higher the speed, the greater the movement. Therefore, the number of propeller blades of the submarine is gradually increasing, from three to five, from five to seven. For example, the thrust of a seven-bladed propeller reaches that of a three-bladed propeller, and the speed is only one-tenth of that of a three-bladed propeller!

The number of blades of a propeller is always odd, and this is because the odd number of propellers is asymmetrical, which significantly eliminates resonances. At the same time, increasing the degree of side skew of the propeller can also increase the thrust, that is, the large side skew. This refers to the propeller has a caster angle, the amount of this caster angle is defined by the side bevel angle, the angle between the center line of the propeller hub and the center line of the propeller is greater than 25 degrees of the propeller is called a large side slant propeller, and the ordinary propeller side slant angle is only about 10 degrees.

Of course, the more leaves the better, the more leaves, the more difficult it is to process! Multi-faceted balance, seven-bladed large side tilt propeller, is the most suitable choice.

Such a demand leads to a complex geometric configuration of the submarine's propeller, and every detail of the design of this configuration will affect the noise and propulsion efficiency!

Soviet scientists, the theoretical knowledge is also extremely solid, they can calculate, design the best shape of the propeller, reduce cavitation, reduce vibration, reduce noise, reduce speed, and increase the propulsion efficiency, but after the design of this propeller, the manufacturing is facing difficulties!

Because there is no multi-axis linkage CNC machine tool, it can only be processed first a plane, and then another plane is processed, even if the Soviet machine tool fixture is distinctive, it is also faced with the problem of reduced accuracy because of this transformation, for the propeller This precision large device, a millimeter of error, will lead to a great change in performance!

And now, with the arrival of equipment from the island nation, Soviet submarine designers finally don't have to worry about this problem anymore! The equipment of the island country, the processed propellers, the accuracy has fully met the requirements, which means that the underwater sound of the Soviet submarine has been reduced by an order of magnitude!

For example, now, the Soviet nuclear submarine under water, with a seven-bladed large side-inclined propeller at the tail, has a cruising speed of 8 knots just by maintaining a speed of 80 revolutions per minute!

With more than one revolution per second, there is almost no additional sound in the stirring water, and the rotation of the two propellers can be seen clearly with the naked eye!

That's right, it's two propellers, and this submarine under the water is a cruise missile attack nuclear submarine with Soviet characteristics, Type 949, NATO code name Oscar!

The nuclear submarines of the West are either ballistic missile nuclear submarines or attack nuclear submarines, and the Soviet submarines, in addition to these two, have an innovation, which is a cruise missile attack nuclear submarine! The only mission of this kind of nuclear submarine is to attack the American aircraft carrier with its own anti-ship missiles, which is a mass killer tailored for the American aircraft carrier!

There are almost no submarines in the West with a displacement of more than 10,000 tons, except for the Ohio class. And the underwater ghosts of the Soviets, there are a lot of big guys, like the current nuclear submarine with an underwater displacement of up to 16,000 tons! (18,000 tons for later models, depending on the model). The double-shell structure, commonly used in the Soviets, was adopted, and the width was several meters between the internal pressure-resistant shell and the outer non-pressure-resistant shell! Among them is the big killer to counter the United States, the P-700 anti-ship missile! This missile, which has a range of more than 500 kilometers, is a weapon that terrifies US aircraft carriers!

At the same time, the structure of the double-layer pressure-resistant shell gives it good sinking resistance, even if it is hit by a torpedo, it can completely resist it, while Western submarines are single-hulled, as long as they hit a torpedo, they will be completely damaged, and if they don't do well, they will sink.

As the latest Soviet submarine, it has adopted various advanced noise reduction measures, including sound-absorbing tiles on the outside, various devices installed on shock-absorbing bases, etc., plus a low-noise propeller in the tail, it is simply a black hole in the ocean!

This is the first ship of the Oscar class, thanks to the support of the advanced industrial technology of the island nation, which led to the acceleration of the construction progress, and it was commissioned in March this year, and at the same time, it is also the most secret weapon of the Soviet underwater power! The Americans simply did not know that there was such a nuclear submarine with advanced performance! (I can't find the number of the first two Oscar-class, let's name it K-146 first.) (To be continued.) )