"Turn a crankshaft, you have to look at the drawings repeatedly countless times, the first car and the rear car, whether to lose the amount of grind, or directly processed to the size, the thread is positive or negative, in short, in the heart to have a plan, determined before you can take action, even this can not guarantee whether it is correct, to many experiments, below I will tell you some knowledge that has not been talked about before.

For high-efficiency metal cutting machining, the material to be machined, the cutting tool, and the cutting conditions are the three major factors, which determine the machining time, tool life, and machining quality.

The three elements of cutting conditions: cutting speed, feed and depth of cut directly cause damage to the tool.

As the cutting speed increases, the tip temperature rises, resulting in mechanical, chemical, and thermal wear.

A 20% increase in cutting speed reduces tool life by 1/2. The relationship between the feed condition and the wear behind the tool is very small. However, the feed is large, the cutting temperature rises, and the rear wear is large.

It has less impact on the tool than the cutting speed, although the impact of the depth of cut on the tool is not as large as the cutting speed and feed, but when the micro depth of cut is cut, the hardened layer of the cut material will also affect the life of the tool.

The cutting speed to be used is selected according to the material to be processed, hardness, cutting state, material type, feed, depth of cut, etc.

The selection of the most suitable processing conditions is based on these factors.

Regular, stable wear and tear to reach the service life is the ideal condition. However, in practice, the choice of tool life is related to tool wear, dimensional changes to be machined, surface quality, cutting noise, machining heat, etc. When determining the processing conditions, it is necessary to study according to the actual situation. ”

Everyone was listening and remembering, and it was clear that they had not learned this knowledge before, and from now on they had been exposed to a deeper level.

In the past year, Liu Lang has taught them more than 20 lessons, each time it is "dry goods", it may take several years to understand in the factory, otherwise the workers will not improve so quickly, this knowledge and experience is enough for them to learn for a lifetime.

In private, they were all talking about how much knowledge the chairman had learned abroad, and if he could just teach like this, he would one day drain his knowledge, but then everyone found out that the little things that the workers learned were really nothing to Liu Lang, and Chen Wei, a doctor from a university, was no different from a group of ignorant people in front of Liu Lang.

Chen Wei's group of doctors and Liu Lang have an invisible gap, and the workers and Chen Wei also have a huge distance, so calculated, isn't there a difference of 108,000 miles between the workers and Liu Lang? It's simply boundless, so in the eyes of the workers, Liu Lang is a Fucheng open-pit mine, and the reserves are still so much after 30 years of digging, the Fucheng open-pit mine is coal, but Liu Lang's mind is gold, and the value is immeasurable!

In fact, Liu Lang has never learned the knowledge of the workers himself, will the graduate students of Stanford University learn the skills of the workers? These things are originally understood by yourself, they are learning the world's cutting-edge technology, and they are studying how to change the world's machinery.

The knowledge and experience learned by these workers of North Industries Group are summarized by Liu Lang from top to bottom, and he can have as much knowledge as he wants, today he talks about turning technology, and tomorrow he will talk about turning and grinding technology, as well as grinding and milling, turning and milling, etc., which is like a "sweeping monk" that kind of top master turned back to teach a group of martial arts beginners the basic skills of fists and feet, and it is not an exaggeration to describe it with ever-changing.

It seems that Liu Lang teaches them a trick and a formula, but it contains logical thinking, as long as the workers are integrated and strengthened, they can draw inferences from one another, and then it is logical to teach others, which is also the level that Liu Lang wants these workers to achieve, otherwise every batch of workers will have to be taught by him personally, which will really tire him to death.

The workers of NORINCO basically met Liu Lang's requirements, and after nearly a year, they were considered apprentices, so the next step was to enter the formal industrial manufacturing stage, using the most advanced Andrews machine tools on the market as a template to build the same machine tools.

Liu Lang expects that a process will have to take nearly a year, of course, NORINCO Group is not 100% of all the parts of the machine tool, a machine tool has more than 200 parts, if all of them are manufactured only manpower is not enough, there is no need for that, NORINCO Group only manufactures the core part, the crankshaft that Liu Lang drew on the blackboard just now is one, in addition to the tool, don't underestimate the tool part, this is like a person's fingers, if there are no fingers what can you do? Now the country in the manufacture of knives is very big gap, which has something to do with smelting technology, but also with the current processing technology and accuracy, both aspects Liu Lang has a way to make up.

In addition, there is another point, in the first year of the North Industries Group did not have any input, no, it cannot be said that there is no at all, the welding project of the Jibei City Power Plant was finally completed by Ma Ming and others, and the reinforcement welding technology they applied also caused a strong reaction from West Germany and the island countries: How can you China also master the reinforcement welding technology? This is not scientific!

Reinforcement welding technology was first invented two years ago by the island nation's Fengtian company, and the door parts of several luxury cars are made using this technology, which is very strong and not bad in integrity.

This technological invention has been targeted by other countries and companies, the United States, West Germany, France and many manufacturing companies have begun to study, but more than two years have passed and none of them have been able to imitate it, but they have also made a lot of progress, Stanford University as a very strong faculty of scientific research institutions, their research has been very close to the final results, Liu Lang just analyzed it a period of time in advance, he graduated from Stanford University for more than a year, it is likely that the United States has mastered this technology.

As for Siemens in West Germany and Mitsubishi Heavy Industries in the island country, they have also invested a lot of money in the research and development of the project, and have also achieved great results, and may be able to crack the mystery in another year and a half, but at this time, a country with an industrial level that is not in their eyes suddenly came up with this technology, is this true?

Of course, this is true, even if they don't believe it, but the weld and the test results will not deceive their eyes, this technology is used in more than 100 seams alone to save more than 2 million yuan, and the strength is greater, not to mention the Jibei power plant, even Siemens' own company will not refuse.

Well, the reinforcement welding technology has made NORINCO Group earn more than 100,000 US dollars, which is converted into more than 1.1 million yuan, which is net and does not cost much, which fully reflects the advantages brought by advanced technology.

The net profit of more than one million yuan is enough for a year's income for a small factory, but for NORINCO, this amount of money is really not a fart.

NORINCO pays more than 1 million yuan in wages to workers a year, and nearly 10 million yuan is spent on the purchase of equipment and raw materials.

Therefore, the reinforcement welding technology earns more than 100,000 yuan, which is just a sound.