One Thousand Four Hundred and Sixty-Two Flexible Processing

The latest website: At present, although most of the cars on the domestic market adopt the automatic transmission design, the most commonly used automatic transmissions are CVT and dual-clutch.

The reason why these two transmissions are used in large quantities is because they are cheap.

However, these two transmissions also have their own disadvantages. For example, CVT transmissions have poor reliability, are prone to slipping when starting, and cannot withstand too much torque.

And if it is not used properly, it is easy to go wrong if it is about 100,000 kilometers.

As for the dual-clutch transmission, let alone the low-speed frustration is a problem brought out of the mother's womb.

But so many car manufacturers, knowing that these two transmissions are unreliable, why do they still use them?

It is because they are cheap, the cost of these two transmissions is basically in the range of 2000-4000 yuan.

And if you use an AT transmission, the cost will be about 10,000 yuan.

So now the hydraulic automatic transmission such as AT has basically become the standard configuration of high-end cars.

Only a small number of conscientious companies will equip their ordinary models with this kind of transmission.

The reason why this kind of transmission is expensive is because of two difficult technical problems.

One is the TCU, which is the logic system for controlling gear shifting. There is not much to say about this, but it requires long-term technical accumulation, understanding of various variables, and then tuning according to the engineer's own understanding.

In this regard, domestic car companies generally do not have the patience to do it, and most of them entrust foreign companies to train them.

The only domestic companies that can make their own shift systems are BYD and FAW.

As for another difficult problem to overcome, that is the hydraulic torque converter.

This is actually a hydraulic oil tank. When driving, the on-board computer will judge the needs of the driver according to the road conditions and speed.

Then at the same time TCU, at this time the TCU will control the fluid flow inside the tank by controlling various access valves in the hydraulic torque converter.

So as to achieve the purpose of controlling gear shifting through hydraulic pressure.

The principle is very simple to say, in fact, this kind of hydraulic torque converter was first born during World War II in the last century.

It was first invented by the Americans and used on their Sherman tanks.

So many Germans like to brag that the German Tiger tanks during World War II were invincible and could beat Sherman to the ground.

But why did Sherman win the war?

On the one hand, it is quantity, and on the other hand, it is mobility.

Because at that time, American tanks had already used automatic transmission, and it was still an automatic transmission with four gears.

So at that time, the American tanks were already superior to the German Tigers in terms of mobility and operation.

After World War II, this automatic transmission was miniaturized and used in a large number of cars.

Later, it was the Germans and Japanese who carried forward this hydraulic automatic transmission.

In particular, Japan's Aisin and Germany's ZF have played this hydraulic automatic transmission to the extreme.

Even now ZF's eight-speed transmission is known as the best transmission in the world.

The gear shift is linear, there is no setback, and it is very sensitive, and it is also very fuel-efficient.

The most important thing is reliability, which is several times better than dual-clutch and CVT.

Some of our automobile manufacturing enterprises also once wanted to produce this kind of hydraulic automatic transmission.

After simple attempts, without exception, all of them ended in failure.

The reason for such a result is that we are backward in the field of machining, and we cannot produce valve bodies for hydraulic torque converters as complicated as others.

Even if people publish all the drawings on the Internet, it means that we can copy them at will.

But we can't copy it out, because the pipeline inside the valve body is too complicated.

Those valve bodies are completely hard-turned and milled out of two aluminum alloy ingots.

On the special metal iron ingots, the pipes are machined one by one, turning, milling, boring and grinding, and all the processes are used, and it is processed in this way.

Those pipes are the routes that the hydraulic oil travels in the valve body. Each route must be consistent in thickness, and the inner wall of the pipes must be extraordinarily smooth.

The valve bodies on both sides should be machined with a precision of 99.999%, so as to ensure that when the valve bodies on both sides are pressed together, they will fit tightly and there will be no leakage.

Once leakage occurs, it means that the valve body is useless.

And you have to know that the pipes inside the valve body are sometimes not straight, in order to achieve various purposes.

Engineers will design these pipes into a zigzag shape, which greatly increases the difficulty of processing.

In the eyes of those machine tools in our country, there are basically few machines that can process such complex cavity pipes.

Therefore, even if people put all the drawings on the Internet, we can't make such a complicated gearbox even if we copy it.

This is the main reason why Aisin and ZF can be superior and give our domestic car companies whatever they want.

Because at present in the world, only GM and Ford are used for their own use, and only these two companies can equip large-scale hydraulic automatic transmissions for car companies.

However, if domestic car companies want to enter the field of high-end cars, they basically cannot get around the threshold set by these two companies.

This is what Li Wensong, as a car enthusiast, knows about the truth about the domestic auto industry.

And at this time, I saw that this unnamed 'machine tool' actually used such a form to process and produce the valve body of the hydraulic torque converter.

This not only made him feel eye-opening, but also felt that the sky was bright.

With such a company, I believe that the spring of domestic automobile manufacturers has come.

At this time, Huang Haibin beside him was concentrating on the unnamed device in front of him, lost in thought.

The design concept of this device is actually very similar to the concept of the surgical robot he developed.

It's just that the surgical robot he developed mainly works on the human body.

And this robot works on various iron ingot workpieces.

The main purpose of the surgical robot he developed is to cure diseases and save lives, and the main purpose of this robot is obviously to process and produce various workpiece equipment.

When he was working at MIT, he had been tinkering with five-axis machine tools for a period of time.

Of course, at that time, it was mainly for processing and manufacturing some experimental equipment that he wanted.

Because they want to engage in cutting-edge scientific research, many experiments of their team need to be designed by themselves.

To carry out such an experiment requires a lot of new test equipment, which is difficult to purchase in reality.

If it is customized according to a special manufacturer, the cost is very high, and it will be very slow.

So they use the equipment they have at hand to produce the experimental equipment they need.

It was from then on that Huang Haibin had full contact with various machine tool equipment.

He has used everything from German DMGs to top gear from Yamazaki Mazak.

Therefore, his understanding of machine tools can be said to be more than any entrepreneur who came here today.

At this time, he saw two robotic arms holding iron billets on this equipment, which were like the fixtures used by ordinary machine tools.

However, unlike the fixtures used in ordinary machine tools, these two arms can move.

It should be known that whether it is DMG or Mazak's machine tool during processing and production, the most taboo is the tremor of the bench or fixture.

Because once the bench and fixture vibrate, it will definitely affect the vibration of the processed workpiece.

So sometimes in order to ensure the machining accuracy, the locations where these machine tools are installed even need to build a factory building.

And the bottom of these factory buildings must not only be filled with sand, but also filled with various shock-absorbing rubbers.

Such a foundation will absorb ground vibrations from other directions, and at the same time, when the equipment is processing.

It can also effectively absorb the tremor force transmitted from the machine and equipment, and dissolve it in the buffer zone under the surface. It will not be like a hard ground, which must transmit a reaction force back to the equipment while receiving force.

And these seemingly inconspicuous forces may affect the precision of machining.

Therefore, the installation and use of a five-axis linkage machine tool is very particular.

But seeing this device today opened his eyes.

This 'machine tool' is visible to the naked eye, and there is a hard concrete floor under its feet, without any buffer protection measures at all.

But when this machine tool is running, it is still as stable as an old dog, and the machining accuracy is not affected at all.

And this secret happened on the two mechanical arms that acted as grippers.

The force exerted by the tool on the workpiece when the machining cutters trace and walk on the workpiece iron blank they hold.

It will be transmitted to the two mechanical arms through the workpiece, and the two mechanical arms will actually be transmitted with the force, and fine-tune the angles of holding the workpiece from time to time.

It's like two mechanical arms that can play Tai Chi. When the other party rushes over with another brute force, they will draw a circle to directly dissolve the other party's strength.

For Huang Haibin, who is used to the processing and production of ordinary five-axis machine tools, this is simply a fantasy.

Because in his concept, hard links are inevitable when machine tools process workpieces.

Because if there is no head-to-head, how can the tools of the machine tool work on the workpiece to describe the shape you want by turning and milling.

The machine tool in front of him has completely subverted his concept of traditional machining.

Because this machine tool implements soft connection, it adopts the mode of curved surface processing and flexible processing.

That is to say, while the two mechanical arms used as fixtures are constantly fine-tuning to resolve the huge impact force brought by the vertical and horizontal opening and closing of the processing tool on the workpiece.

The machining tool is actually adjusting the angle from time to time, which can ensure that it follows the adjustment of the mechanical arm and completes the machining without interruption.

Isn't this Nima the legendary flexible processing...