When Rongcheng Xinkaixing Ball Screw Factory once again began to trial produce ball screws, ball screw nuts and matching balls with the process formulated by Yunfei, Jiuyi Heavy Industry began the production of various spare parts for their first CNC lathe.

The bed and various castings are ready-made, after all, from the beginning of the trial production of 91 Heavy Industry is an ordinary lathe. At the beginning, the bed of the ordinary lathe with a rotary diameter of 400mm selected by Yunfei is basically no different from the bed of the CNC machine tool, the only difference is that the gears in the headstock are more precise than ordinary lathes.

After all, the numerical control transformation of the ordinary lathe is just to replace the smooth rod and trapezoidal screw rod used for transmission on the ordinary lathe, and turn it into a ball screw with higher transmission accuracy, and remove the operating handle used by workers to manually operate and control the machine tool, and replace it with the drive of the stepper motor or servo motor controlled by PLC.

In addition to the electrical parts on the CNC lathe, there are many more than ordinary lathes, and there are fewer mechanical parts than ordinary lathes. After all, the gear set, the mechanical device used to control the machine automata during machining, is no longer needed on the CNC machine. Compared with ordinary machine tools, CNC lathes have one less carriage box equipped with a set of automatic mechanical control, one less gear set for feed speed selection, and the weight must be reduced by at least several hundred kilograms.

Of course, the only drawback brought by such an improvement is the reduction of the rigidity of the machine tool.

No matter how advanced the CNC machine tool is, it cannot be compared with ordinary machine tools in terms of rigidity.

Ordinary machine tools, because of a large number of gear sets used to transmit power, so in terms of structure, especially when running at full load, far more than CNC machine tools. Therefore, even in the world of Yunfei, in that era, the biggest role of CNC machine tools was to process small parts with a small blank allowance and semi-finishing and finishing those large workpieces that have been removed by ordinary machine tools.

Of course. If there is no heavy-duty CNC machine tool with fairly reliable accuracy, and the processing of many heavy-duty parts with a relatively high accuracy level, it is better to choose those ordinary machine tools with stable processing quality and reliable accuracy.

CNC machine tools, need to keep up with the development of tools, otherwise, no matter how good the CNC machine tools are, they are in vain.

Fortunately, there have been many domestic tool manufacturers in the beginning of the study of CNC machine tools used in those high-hardness, wear-resistant CNC tools. In the Rongcheng Economic and Technological Development Zone, there is a cemented carbide factory that was moved out of the dinosaur grave. The foundation of the building is now being built.

Many people believe that the reason why the factory moved to the Economic Development Zone is because of the existence of Jiuyi Heavy Industry, an enterprise that produces machine tools and intends to enter the CNC machine tool market. The Chengdu Municipal Government thinks so, the Economic Development Zone Management Committee also thinks so, and even the people in the factory think that this is the reason. Yun Fei just laughed secretly in his heart when he heard other people's comments like this. In his world, the cemented carbide factory would also move the factory here after the space systems factory moved over.

Dinosaur grave that small city. It is simply not suitable for the development of tool manufacturers that originally served the machining industry.

This factory, in this world, may benefit from the development of its own Jiuyi Heavy Industry. At least, they won't be like in their own world, where they haven't developed much from beginning to end, and they are not very famous in China. Not to mention abroad. Because that company only produces some tools for ordinary machine tools.

"The grinder is leveled, at least within a μ." Yun Fei said to the worker who was leveling the grinding wheel on the grinding machine.

A tool used by workers to level grinding wheels. It is not the most commonly used dial gauge in the machining industry for finishing. Because the processing of most mechanical parts, the alignment range is between one and two wires. However, the guide rail grinding machine is not an ordinary processing equipment, but the most sophisticated machining equipment in China in this era.

Therefore, the tool used in the hands of the workers to correct is a dial gauge representing a μ in a small grid. When the hands move one notch, the outside changes by only one thousandth of a millimeter.

"When the knife is lighter, otherwise it will affect the processing ...... behind" In the precision machining workshop of Jiuyi Heavy Industry, with the grinder on the guide rail grinder that has been overhauled and the machining accuracy is even better than when it just left the factory, Yun Fei took Yu Jianhua, the workshop director of the precision machining workshop, and several mechanical engineers from the Soviet Union while watching the entire Jiuyi Heavy Industry workers with the best skills in the lathe bed on the fixed workbench in the middle of the guide rail of the gantry milling machine. While nervously looking forward to it.

The production of ordinary lathes was nothing more than a pediatric thing for hundreds of professional skilled workers who produced various types of machine tools, as well as dozens of mechanical engineers from the Soviet Union. Although there were many problems in the past, it was not because of the lack of technical strength of the whole factory, but because of the imperfection of various management systems at the beginning of the factory, and the human factors caused by the change of environment for workers.

After the ball screw and production, Yunfei began to stay in the production workshop of Jiuyi Heavy Industry, following the processing process of the most critical part of the bed, and taking several skilled mechanical engineers responsible for the design of this aspect, constantly transferring in various production workshops.

All the people in the factory are serving this CNC lathe, which is not yet known whether it will succeed.

In just seven days, all kinds of spare parts of the first CNC lathe of Jiuyi Heavy Industry have entered the finishing workshop from the blank state. After the finishing is completed, in addition to the gears in the headstock used to transmit the speed also need some surface high-frequency quenching, you can go to the dust-free workshop built by Yunfei, which has not been put into use, and everyone does not understand what it is used for the final assembly.

You must know that this dust-free assembly workshop, that specification is built according to the electronic component production workshop of Jiuyi Heavy Industry, and the construction cost alone is four times that of other workshops!

After Sun Lin and Situ Heyun knew that the workshop in Daoyunfei was used for the assembly of CNC machine tools, they also clamored for Yunfei to invest heavily in the purchase of imported central air conditioners to turn this assembly workshop into a dust-free constant temperature workshop, which made Yunfei depressed.

For those high-precision and cutting-edge five-axis or more precision CNC machine tools, the constant temperature workshop has a great impact on improving the accuracy of the machine tool, but for these ordinary CNC machine tools, there is not much impact at all.

After all, for high-precision CNC machine tools, the processing grade can be calculated in a few tenths of a μ, while the machining accuracy of ordinary CNC machine tools can be calculated in wires. The difference between the two units alone is counted in tenfold.

In Yunfei's world, many CNC machine tool manufacturers list their own CNC machine tools that can achieve a production accuracy of 0.1μ, but there is a theoretical design accuracy in front of it. The actual machining accuracy can be guaranteed to a trace, and it is definitely a CNC machine tool with quite good accuracy.

"Don't eat too much cutter, now it is the most refined grinding, otherwise there will be a lot of stress in the cutting process, which will remain inside the bed of the machine tool." Seeing that the grinder of the guide rail grinder was moving quickly to the front, and a large number of sparks were thrown out to the back, Yun Fei was so anxious that he jumped to his feet.

Although the amount of knives is large, the cutting speed is fast, and the processing efficiency is high, Yunfei does not need efficiency at this time.

In production, especially in finishing, the more eager you are, the more likely you are to have problems. At this point, if something goes wrong with the finishing, the week's time is wasted.

The ball screw factory is waiting for the test situation here!

Originally, the machining accuracy of the ball screw can also be carried out on the surface of the ordinary lathe during operation, but the structure of the ordinary machine tool is still very different from the structure of the CNC machine tool. The same ball screw can meet the design accuracy requirements on ordinary machine tools, but it may not be able to achieve it on professional CNC machine tools.

It doesn't even have much to do with assembly.

Ordinary machine tools are transformed into CNC machine tools, although the ball screw driven by the motor is used in the feed transmission, but the gears in the headstock are still those gear sets of ordinary machine tools. The rigidity is better than those simple CNC machine tools, but the machining accuracy and surface quality cannot be compared with simple CNC machine tools.

Although the surface of the ball screw produced by the ball screw factory has reached a Rockwell hardness of 58-62 degrees after high-frequency quenching, Yun Fei is very worried about wear and tear in the process of heavy-duty cutting. After all, there is really no way to guarantee the accuracy of the balls produced now and the ball screw.

"Pay attention to the sparks of processing, you are doing the most finishing work, not rough processing......" As the guide rails on the bed of the depot gradually became smoother, although the sparks generated behind the grinder were getting smaller and smaller, Yun Fei still kept roaring on the side.

This is the first CNC machine tool of Jiuyi Heavy Industry, and it must be enriched into the precision machining workshop of Jiuyi Heavy Industry. Yun Fei didn't want to use a few years, the first CNC lathe he produced was because the cutting force of the bed was too large during the finishing after the lathe, and the stress remaining in the bed made the machine tool guide rail bent, resulting in the decline of the accuracy of this machine tool with incomparably significant symbolic significance.

Finally, under the roar of Yunfei, the bed of the first CNC lathe of Jiuyi Heavy Industry completed the most refined grinding processing, and walked down the workbench of the guide rail grinder under the ten-ton crane lifting.

"Lao Zhao, Lao Gu, it's up to you now. Although the precision of the design of this CNC lathe is not high, I hope that our Jiuyi Heavy Industry can reach a level that far exceeds the design accuracy requirements. Therefore, I hope that you can grind out the guide rail of this machine bed with your highest level, I do not require you to achieve more than two levels of accuracy, but I hope to be able to see the fourth, or even third-level accuracy...... "There is no problem with the finishing, Yun Fei breathed a sigh of relief. (To be continued......)