From now on, NORINCO will begin to enter the R&D and production stage, where various parts will be manufactured, and workers will improve their skills in the process, and these parts will have value in their own right.

For example, the crankshaft drawn by Liu Lang just now, the German Andrews company sells for more than 4,000 yuan, which is expensive, and there are supporting knives, and the price of a set is also as high as more than 1,000 yuan.

The crankshaft is better, it is a durable product, as long as you do not remove it and smash it hard, it will not be damaged often, the tool is different, no matter how good the tool is more than its bearing range, and under the domestic production conditions, the tool will often be in a state of full load operation, in this state the life of the tool will be sharply shortened, the tool that can be used for a year is likely to take less than a month to appear wear and tear, and then affect the processing of parts, with less than two months to re-purchase, not because the German product is not good, under the same conditions if it is replaced with a domestic product, I am afraid that a knife will have to jump the blade。

In this way, a machine tool alone costs five or six thousand yuan a year, and ten machine tools cost fifty or sixty thousand.

Now there are nearly 100 enterprises in the country to buy Andrews machine tools, more than 1,000 machine tools, that the original tools alone have to be five or six million every year, which is not counting the small factories that can not afford to use Andrews's machine tools to buy only tools, the number of them purchased is much more than the whole set of purchases, so that a calculation, the purchase of tools alone in a year is more than 20 million yuan, and this number is increasing at a rate of 20 or 30 percent every year, basically about three years will double, it is really a huge market。

If NORINCO manufactures tools of the same quality, the price will be much lower than Andrews, and the labor cost will be more than ten times lower than that of the other party.

Crankshaft and cutter is the main direction of NORINCO in the next year, these two parts can enter the market immediately once mass production, this is the real brand of NORINCO Group, of course, this is just a transition, NORINCO aims to manufacture machine tools, workers can also strengthen their skills again through learning.

"Okay, I told you so much about the knowledge of turning technology, I think you should also know the next plan of our NORINCO, I am ready to manufacture the kind of crankshaft I just drew within a year, and more than a dozen kinds of tools, everyone take a look!"

Liu Lang picked up the chalk again and drew on the blackboard with one hand at a time.

Draw different shapes with both hands at the same time, this is Liu Lang's unique skill, and the world can't find a second person, but the workers have long been accustomed to it, and feel that it is nothing great, but they have tried it themselves, and no one can imitate it, fortunately, there is no anthropologist here, if you see Liu Lang's multi-purpose brain, I am afraid that you will have to shout and dissect this "monster".

That is, in ten minutes, Liu Lang drew thirteen kinds of tool graphics, and the parameters were also clearly written.

"Oh good fellow, these knives are so subtle that they can't be compared!"

The workers couldn't help but let out a sigh of admiration, in their eyes this is a work of art, if it is made, they are a little reluctant to use.

Liu Lang is not just painting, what he wants to do is to explain the knowledge contained in it to everyone.

"In the manufacture of a tool, the geometry must be considered first, because the geometric characteristics have a direct impact on the cutting force: first of all, the right concentricity is conducive to the uniform distribution of the load on the cutting edge: a large overlap of cutting edges is conducive to obtaining uniform cutting force characteristics, a short cutting length is conducive to good rigidity, the core cross-section is in the best condition, and the stress concentration at the notch is minimal.

The tool geometries I have drawn have been perfected, and the increased load on the cutting edge requires a stable design of the cutting edge geometry.

However, at high speeds, more frictional heat will be generated in the free area of the workpiece surface, which means that the clearance angle of the tool must be reduced. Therefore, increasing the stability of the cutting edge can only be achieved by reducing the bevel angle.

In the case of a very hard material and a brittle tool material, it can even lead to a negative bevel......... I will explain each one to you in detail in the future.

Then there is the material and coating, and the tool material must be harder than the material to be machined. The greater the hardness difference between the workpiece material and the tool material, the less wear and tear the tool will be, and the longer the tool life. Because of the high local temperatures, it is also necessary to ensure that the tool material is resistant to oxidation.

Large thermal load fluctuations and the requirements for the oxidation resistance of the tool material make it necessary to coat the fine particle tungsten carbide cutter body in the end, this material can only be smelted by one smelting furnace in China, of course, I will contact other manufacturers to let them smelt.

In addition, there is another detail that is easy to overlook, but it plays an important role in turning, and that is the requirement for tool holders.

NORINCO manufactures high-end machine tools, so a high spindle speed is required in machining, which requires a very high toolholder system, because the toolholder flange is installed on the spindle head, and the toolholder is in Z There is a clear mechanical support in the direction, so that at higher speeds, the spindle is not dragged into the spindle due to the increased centrifugal force, which requires a very high balance, and if the balance is not well balanced or the rotating tool system is not focused, it will lead to poor surface quality, very low tool life, poor machining stability and safety can also damage the milling spindle

An imbalance is equivalent to having an eccentric object spinning. This eccentric object induces a centrifugal force that increases in square as the rotational speed increases. This means that the same imbalance induces a centrifugal force on a spindle at 42,000 rpm that is 441 times greater than on a spindle at 2,000 rpm (212 = 441). Therefore, the imbalance of the tool holder device in high-speed machining has particularly obvious adverse consequences. ”

Therefore, the equilibrium mass has an important impact on the dynamic performance of the entire rotating system.......... ”

Liu Lang said above, and everyone remembered carefully, everyone is like a sponge in water, frantically absorbing knowledge, maybe they don't feel it, but in fact, these people are improving very fast, and in the country, they are the best manufacturing workers.

NORINCO Group has started a new round of study and work, and at the same time it has also led a group of followers, and has begun to gather enterprises around NORINCO, Liu Lang often gives them a pointer, so that they can quickly adapt to the rhythm of NORINCO Group, this time they are real, and it may be another year after another year that the industrial upstream and downstream industrial chain will be initially formed.