Start with the aviation industry

Chapter 130 Large Parts Machining
the next day.

Wang Tianfang and Lin Feng came to the casting workshop in person again, why did Wang Tianfang come in person again.

Because he placed great hopes on this broaching machine, he wished to manufacture it earlier, and then use it for broaching various parts of aero-engines.

The two walked into the foundry workshop and saw workers opening the mold from a distance, and more than half of the cast broaching bed base had been exposed.

Invisibly, the pace of the two of them was a little faster.

It didn't take long for the entire base of the broaching machine to reveal its true face, which was unreservedly displayed in front of everyone, and many workers surrounded it. This was the first time they worked on such a large casting.

The length is 15 meters six, the height is more than 600 meters, the bottom is wide and the top is narrow, the widest part of the bottom is more than one meter, and the total weight exceeds three tons.

"It's really long!"

"Tsk tsk, I have worked as a foundry worker for more than ten years, and this is the first time I have participated in casting such a large part."

"I'm still looking forward to it. I hope to see the first CNC broaching machine manufactured as soon as possible."

"."

Listening to the words of the workers, Lin Feng and Wang Tianfang looked around the broaching bed base and nodded slightly.

Neither of them saw any quality defects, and should be qualified in terms of quality.

After careful inspection by technicians and quality personnel, it is concluded that the castings fully meet the quality requirements and are all properly qualified products.

After the inspection, the large casting was also hoisted by the crane in the factory building, and placed on the open space outside the factory building by a transfer vehicle.

It will be placed here, exposed to the sun and rain, for at least half a month. Of course, the longer the time, the better. It is best if it can be placed in this place to be exposed to the sun and rain for three to four months, or even more than half a year. of.

This is called natural aging.

Place the casting in the open air like this, and after a few months, the internal stress of the casting will gradually disappear, and subsequent machining will not cause deformation. As a base of a broaching machine, there is a very important requirement, that is, stability .

Some people will say that it will rust in the open sun and rain, and there will be some, but it will be controlled.

Why use a cast base instead of a steel plate welded base?

It is because of the stability problem that the stability of the cast base is much better than that of the welded base.

Looking at the open-air casting base again, Lin Feng and Wang Tianfang left the casting workshop satisfied.

Wang Tianfang said, "Xiao Lin, we have already contacted the manufacturer of large broaching machines for you."

Lin Feng said in surprise, "Boss Wang, your speed is so fast."

Wang Tianfang smiled, "It's also a military enterprise. It's in the province. They have the equipment and experience to process large parts. When I'm free, I'll take you there."

This is great!

Lin Feng quickly thanked, "Mr. Wang, it is of course the best if you can take us there in person, it's just that this will waste your time."

Wang Tianfang waved his hand and said, "There is no delay, as long as this CNC broaching machine can be manufactured as soon as possible, I am willing to do anything."

Several large pieces of this CNC broaching machine have a length of more than ten meters. In addition to the casting base of the broaching machine, there are also guide rails and knife boxes for the broaching machine.

They are all important and key parts, and the processing accuracy is relatively high, especially the guide rail, the straight line accuracy is very high, the straightness of the guide rail with a length of more than ten meters is required to be no more than five wires, and the straightness within any length of one meter is not more than one thousandth five.

Of course, the equipment branch factory does not have such processing capacity, and the Phoenix factory does not have the equipment to process such large-sized parts, so it can only be processed outside.

Lin Feng once considered buying large-scale equipment to process and manufacture it himself, but he quickly denied it. Why buy equipment and process it himself if it can be processed outside.

In the 21st century, many companies are only engaged in R&D and design, leaving the manufacturing outside, and the suppliers are responsible for the processing and manufacturing, and at most they do the final assembly and debugging by themselves.

The most typical and representative is locomotive manufacturing, whether it is urban rail or high-speed rail, the latter is an ordinary train locomotive, the research institute is responsible for design and development, the main factory is responsible for assembly and commissioning, and the supplier is responsible for the manufacture of all parts of.

Lin Feng also plans to refer to this model.

Lin Feng approached Wang Tianfang and asked Phoenix Factory to help find a manufacturing factory capable of processing these large parts.

Wang Tianfang was very efficient and quickly found it for Lin Feng. It was also a military enterprise, and it was a large military enterprise in the province. They had the equipment and technical strength to process large workpieces.

No wonder Lin Feng was immediately grateful. After finding such a company, there would be no problem in the manufacture of these critical large parts.

The next day, under the leadership of Wang Tianfang, Lin Feng and his entourage went to this large military industrial enterprise, met their directors, and saw several large-scale equipment, such as gantry milling machines, gantry planers, etc.

Such large equipment has no problem processing workpieces with a length of 30 to [-] meters, and it is even more problem-free to process workpieces with a length of more than ten meters.

The only problem is the problem of machining accuracy.

The accuracy requirements of the machine base are not very high, so there is no problem. The guide rails and tool boxes require extremely high accuracy.

The most important movement of the CNC broaching machine is linear movement, the knife box and the guide rail cooperate to move under the action of tension.

The two are in a precise fit relationship. The guide rail is convex and the knife box is concave.

But Lin Feng has a way.

To be precise, the system is very well thought out, fully taking into account the domestic equipment situation and processing level. Whether it is the guide rail or the knife box, there are still several processes in this large military enterprise after finishing processing and transporting it back to the equipment branch factory.

In the equipment branch factory is the final precision machining, which will eventually meet the design accuracy requirements.

These processes are scraping and grinding, which do not require large-scale equipment, but require extremely high technical level of workers. As a military enterprise, the most important thing Phoenix Factory lacks is highly skilled workers.

Not to mention the seventh-level fitters, there are even eighth-level fitters. Such a process is not a problem.

The two sides negotiated cooperation in a friendly atmosphere, and everything was handled within half a day. Lin Feng and others happily returned to the equipment branch factory.

The next days are to complete the drawing of the last part of the design drawings and start the processing and manufacturing of parts.

in the office.

Lin Feng sat there, thinking about the scene of going to that large military industrial enterprise a few days ago. The cars used were all provided by the Phoenix Factory. There were a group of people, and there were two cars in total.

"Our equipment branch doesn't even have a car, should we consider buying a car?"

As soon as this idea popped up in my heart, it immediately sprouted and took root irresistibly.

It will be much more convenient if you have a car.

(End of this chapter)