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Chapter 1114 Use the quality of workers to make up for technical deficiencies

Liu Lang went to class

"We also need to improve the accuracy of the accessories that match the bearings. First, we need to improve the processing accuracy of the box support holes and spindle journals; or we can improve the processing accuracy of the surfaces that match the bearings; we can also measure and adjust the radial runout range of the corresponding parts.

, so that the error is compensated or offset.”

"There is also appropriate preloading of rolling bearings, which eliminates gaps; can increase bearing stiffness; and can even out rolling element errors."

"The other is to adjust the process system. For example, there is the trial cutting method adjustment, which is to measure the size of the trial cutting, adjust the cutting amount of the tool, and then trial cutting again, and repeat until the required size is reached. This method has low production efficiency.

Mainly used for single piece and small batch production.”

There is also the reduction of tool wear, that is, the tool must be resharpened before the tool size wear reaches the rapid wear stage.

Or reduce the transmission chain transmission error, such as fewer transmission parts, short transmission chain, and high transmission accuracy; or use reduced speed transmission, which is an important principle to ensure transmission accuracy, and the closer to the end of the transmission pair, the smaller the transmission ratio should be.

The accuracy of the end piece should be higher than that of other transmission parts.

There are also reducing the stress deformation of the process system, reducing residual stress, reducing thermal deformation of the process system, etc.

Let’s take a closer look at the causes of machining accuracy errors. The main reason is the machining principle error, which refers to the error caused by using an approximate blade profile or an approximate transmission relationship for processing. The machining principle errors mostly occur in threads, gears, and complex curved surface processing.

.

For example, in order to facilitate the manufacturing of gear hobs for processing involute gears, Archimedean basic worms or normal straight basic worms are used instead of the involute basic worms, so that the gear involute tooth profile is produced.

The error is caused. Another example is when turning a modular worm, since the pitch of the worm is equal to the pitch of the worm gear (i.e. mπ), where

m is the module, and π is an irrational number, but the number of teeth of the lathe's replacement gear is limited. When selecting the replacement gear, π can only be calculated as an approximate fractional value (π=3.1415), which will cause problems in the tool

Inaccuracies in the workpiece forming motion (spiral motion) cause pitch errors.

There is also machine tool error, which refers to the manufacturing error, installation error and wear of the machine tool. It mainly includes the machine tool guide rail guide error, the machine tool spindle rotation error, and the transmission error of the machine tool transmission chain.

There are also the effects of guide rail accuracy on cutting processing, machine tool spindle rotation error, stress deformation of the process system, manufacturing errors and wear of tools, the impact of the processing site environment, thermal deformation of the process system, residual stress inside the workpiece, etc.”

Liu Lang's class was full of excitement and excitement. He started teaching at 8:30 in the morning and had dinner at 11 o'clock. After eating, he rested for a while and continued teaching again. He didn't finish until about 4 o'clock in the afternoon. This is still Liu Lang

, if it were others who wanted to explain the problem clearly, it would have taken several days, but even he was very tired and drank several kilograms of water alone.

If lectures alone mean nothing, the key is to practice. There are various tools next to the machine tool, and Liu Lang is like a surgeon performing operations on the machine tool.

After the course was over, this CNC machine tool was basically dismantled by Liu Lang except for the control system. The parts were neatly placed in front of everyone, which made everyone panic.

A machine tool costs more than three million yuan! Just dismantle it like this? What if it cannot be restored?

Machine tool accessories mainly include cutting tools, tool holders, operating parts, dividing heads, worktables, chucks, joints, chip removal devices, hoses, drag chains, protective covers, etc. These accessories can be separated separately, and there are more than five

There are hundreds of parts, including many precision devices, such as a drill bit with a diameter of only 0.05 millimeters and a length of two centimeters, which is thinner than a human hair.

Liu Lang dismantled more than a hundred parts this time, mainly the operating parts and the workbench. These are also the two most critical parts that affect accuracy. Only such an explanation can make people remember it firmly.

.

Of course, it is impossible to restore it. All the structures of this machine tool were remembered by Liu Lang in the form of stereoscopic projection.

In fact, with Liu Lang's current memory, not to mention low-end CNC machine tools with only a few hundred parts, even high-end machine tools with one or two thousand parts can be memorized, but he has never dismantled these in the United States.

machine tool.

Moreover, he also felt that teaching by dismantling machine tools was almost useless. What NORINCO employees needed most was the improvement of craftsmanship.

In the past, the level of employees at Norinco could only be considered a mid-level level. Of course, this mid-level level was measured based on the level of production in developed countries. It might be worse than mid-level, and should be below average.

The so-called lower than average does not mean in terms of personal ability. In terms of personal ability, Liu Lang believes that his workers are no less than industrial workers in any country, and may even be slightly better.

This refers to comprehensive manufacturing capabilities, and the machine must also be considered. Manufacturing a sturdy and durable part includes a good equipment and a good operator. This is the realization of comprehensive manufacturing capabilities.

To put it bluntly, the closer people and machines are, the stronger their manufacturing capabilities will be.

Western countries have advanced equipment, and workers’ skills are mostly inherited and accumulated over nearly a hundred years of industrialization. China is much worse. The equipment is backward, and the quality of workers is also uneven. Most of them are not high-level.

After all, the country’s industrialization accumulation period is too short and lacks foundation.

According to this standard, Norinco's manufacturing capabilities are below average in the world. This evaluation is still very objective.

But Norinco is at the top level in the country, and this is a recognized fact in the domestic industry. Now, every time an industry competition is held, Norinco will send two or three workers to express their feelings. Otherwise, all Norinco

Group employees participate in competitions that others have no chance at.

Liu Lang's workers in China are already invincible, but the goal of Norinco is not to "get in trouble". The company's goal is the whole world, which requires workers to improve their abilities again, from a lower-to-middle level to at least a middle-level level.

Only at an upper level can we be considered successful and stand on the same starting line as developed countries.

In Liu Lang's view, even if my industrial base is not as good as yours, we can make up for some gaps through high-quality industrial workers, and in turn improve equipment through industrial workers. This is Liu Lang's idea.

In more than three years, the workers have learned too many skills from Liu Lang, which Liu Lang taught step by step. Even the ancient masters who taught their disciples could only do this. Many people think that their skills are almost the same. Today they

After seeing the skills of a higher level, the ancients said that if you want to see a thousand miles away, you have to climb to a higher level. Now they are about to climb to a higher level, and at the same time, Liu Lang's true abilities are also going to be revealed.


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