CNC machine tools are designed to improve machining accuracy. Experienced masters or skilled craftsmen may be very skilled, but they cannot eliminate certain errors, such as re-fixing the workpiece.
In the past, manual machine tools could only process one surface. After the processing was completed, it had to be removed from the fixture, replaced with another surface, and then processed. When re-fixed, it would bring about systematic errors. This error cannot be eliminated. If it is
For complex shapes, you have to re-fix it several times, which will bring new errors each time.
CNC machine tools are different. They can use computer programming to directly control the processing of workpieces or tools. They can be operated in three directions at the same time, thus avoiding errors caused by repeated fixings.
The three directions are easy to understand. Up, down, left, right, and back, in the plane rectangular coordinate system, are called the three axes of XYZ. This is an ordinary three-axis linkage CNC machine tool.
The principle of this kind of machine tool is not complicated, but when it is processed, it is quite a test of programming level. At least that's what the domestic machine does.
In the Western world, industrial machines such as machine tools are constantly making progress. So far, five-axis CNC machine tools have begun to emerge.
Compared with the previous three axes, it has two more rotary axes. One is that the worktable set on the bed can rotate around the X-axis, defined as the A-axis, and there is also a rotary table in the middle of the workbench.
It can rotate around the Z axis, which is defined as the C axis.
In this way, through the combination of the A-axis and the C-axis, processing in more directions is achieved, especially the workpiece can be subdivided into any angle, and inclined surfaces, inclined holes, etc. can be processed. When these axes are linked, complex shapes can be processed.
space surface.
For an engine, if you want to increase the power, you must start with a supercharger. Now our 59 tanks use a supercharger, which is driven by the engine. This will consume power, and the exhaust of the engine
After the exhaust gas is discharged from the exhaust system, the energy is wasted. Therefore, in order to improve power, people are beginning to make a fuss about this exhaust system.
The exhaust system is used to push a blade to rotate, and this blade drives another impeller to blow more air into the intake passage, thereby making the engine more powerful. This is exhaust gas turbocharging.
The key to this device is the two turbine blades with complex curved surfaces, and the high-speed bearings that rotate tens of thousands of times.
Processing such a turbocharger impeller requires advanced CNC machine tools. If we want to have an advanced high-horsepower tank engine, this is a technology that must be overcome.
Five-axis linkage can efficiently complete the processing of impellers, and the accuracy is quite good. In Germany today, it is also the most advanced processing equipment. They will never export it to their own country. If they can bring back three-axis linkage, it is already very good.
Not bad.
While the two were chatting, they heard a knock on the door from outside. Wang Erzhu went to open the door and followed a man who walked in with a smile: "You are here, didn't you go out for a walk?"
Turning around following the voice, Qin Zhenhua saw an unfamiliar face, Zhang Baolin.
Except for the two people arguing about specific issues on the plane, they didn't have much interaction afterwards. In the inspection group, Zhang Baolin has always been a silent observer. He is not as outstanding as Qin Zhenhua. Now,
When he came to talk, it was definitely for a purpose.
Qin Zhenhua smiled and greeted: "Uncle Zhang, come and sit."
Zhang Baolin sat next to you and said, "Zhenhua, you are really impressive. No wonder you are appreciated by Commander Huang and Minister Zhu."
"No, I'm just a stupid youngster." Qin Zhenhua said: "On the way here, I even made a joke and almost made people think of me as a thief."
Speaking of this matter, Qin Zhenhua also smiled helplessly. This is a big embarrassment. Even if he doesn't mention it this time, if there is an inspection team coming out in the future, someone will definitely use him as an example: Everyone must maintain their integrity when going abroad.
Have a certain etiquette and demeanor. Don't be like the policeman at a machine factory who looks at other people's heavy trucks in the service area and makes people think they are thieves.
Speaking of this, Zhang Baolin also smiled, and then changed the topic to the engine: "It was just an accident. No one dares to deny your contribution. If it weren't for you, we wouldn't have been able to get a 1,200-horsepower engine so easily.
prototype."
The British have promised to give them prototypes, which will bring great help to everyone's research and development, broaden their horizons, and provide ideas. Several people from the Coal Province Diesel Engine Factory are very happy about this.
Although the two had a dispute on the plane due to different concepts, Zhang Baolin is quite satisfied now when he thinks about the extra gains from this trip to the UK. One more engine means one more research object.
He is already looking forward to taking apart this engine to study it.
After hearing Zhang Baolin's words, Qin Zhenhua shook his head again: "Uncle Zhang, this kind of thing is not a matter of course. Whenever we get the thing, it's not too late for us to be happy."
Qin Zhenhua then sighed: "We still have to be mentally prepared."
Zhang Baolin's expression suddenly changed: "Are they still denying it?"
Qin Zhenhua smiled helplessly: "I hope I'm over-worrying. You can also see that they are on guard against us. They mainly want to make money from us. It's not that easy to obtain their advanced military technology."
.”
Zhang Baolin also sighed: "Yes, so, tomorrow we will go to MTU Company. We will mainly inspect their civilian diesel engines. If we take the civilian road, there will definitely be no problem. What do you think, Zhenhua?"
Only then did Qin Zhenhua realize. He was originally afraid that something would happen to him like he did in the UK. What he was looking forward to buying was the engine of the Leopard 1 tank. Although the power was not particularly powerful, it was a direct military version after all. However, Zhang Baolin
I hope to get it right in one step. If I can't buy a military one, I'll buy the corresponding civilian version of the engine. The two of them have different opinions. Will there be any problems tomorrow?
It is not Qin Zhenhua's decision to decide what to import. He is just a suggestion. After all, he is a small person, and his opinions are for reference only.
Now, facing Zhang Baolin's question, Qin Zhenhua cleverly avoided the topic: "This is the decision of the leader. By the way, Uncle Zhang, the newly developed engine in your factory should be turbocharged, right?"
On the plane, I heard about their 730-horsepower engine. Although the power is not very powerful, it is suitable for use in second-generation tanks. Now Qin Zhenhua's main consideration is about second-generation tanks. Others,
It's all secondary.
Zhang Baolin nodded: "That's natural."
"So what is the biggest technical problem in research and development?" Qin Zhenhua asked: "Is it the processing of the turbocharger?"
This... Zhang Baolin scratched his head: "The biggest problem we encountered was the blown cylinder head."