Chapter 188

When Chengdu xinkaixing ball screw factory started trial production of ball screw, ball screw nut and supporting ball again with the process formulated by Yunfei, Jiuyi heavy industry began the production of various parts of their first CNC lathe.

The bed and all kinds of castings are ready-made. After all, from the beginning, the trial production of 91 heavy industry is an ordinary lathe. At the beginning, the bed of an ordinary lathe with a rotation diameter of 400mm selected by Yun Fei is generally no different from that of a CNC machine tool. The only difference is that the precision of the gears in the headstock is higher than that of an ordinary lathe.

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

CNC lathes have more electrical parts than ordinary lathes, but less mechanical parts than ordinary lathes. After all, the gear set, which is used to control the automation of the machine tool in the machining process, is not needed on the NC machine tool. Compared with ordinary machine tools, CNC lathe has one less slide 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 hundreds of kilograms.

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

No matter how advanced CNC machine tools are, they can't be compared with ordinary machine tools in terms of rigidity.

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

Of course, if there is no heavy CNC machine tool with quite reliable precision, for the processing of many heavy parts with high precision level, we prefer to choose ordinary machine tools with stable processing quality and reliable precision.

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

Fortunately, many domestic tool manufacturers have begun to study the high hardness and wear-resistant NC tools used by NC machine tools. In Chengdu Economic and Technological Development Zone, there is a cemented carbide factory moved out of the dinosaur tomb, and now the basic plant is 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. Chengdu city government thinks so, and so does the Management Committee of the economic development zone. Even the people of that factory think so. When Yunfei heard such comments from others, he just laughed in his heart. In his world, the cemented carbide factory will also move here after the aerospace system factory moves here.

The small city of dinosaur tomb is not suitable for the development of tool manufacturers that originally serve the machining industry.

This factory, in this world, may benefit from the development of its own 91 heavy industry. At least, they will not have much development from beginning to end, as in their own world. They are not much famous at home, let alone abroad. Because that company only produces some cutting tools used in ordinary machine tools.

"Grinder leveling, find at least one μ Within. " Yun Fei said to the worker who was leveling the grinding wheel on the guide rail grinder.

The tool used by workers to level the grinding wheel is not the most commonly used dial indicator in finishing machining in the machining industry. Because the processing of most mechanical parts, the alignment range is between one thread and two threads. However, the guideway grinder is not an ordinary processing equipment, but the most precise machining equipment in China in this era.

Therefore, the tool used by workers to find the right one is a small box representing one μ Dial indicator. When the pointer moves one grid, the change outside is only one thousandth of a millimeter.

"Set the knife gently, otherwise it will affect the later processing..." in the precision processing workshop of 91 heavy industry, the grinder on the guide rail grinder, which has been overhauled and has better processing accuracy than when it just left the factory, runs slowly, With Yu Jianhua, the workshop director of the precision machining workshop, and several mechanical engineers from the Soviet Union, Yun Fei looked forward nervously while watching the best skilled workers of the whole 91 heavy industry quickly level and align the lathe bed on the fixed workbench in the middle of the guide rail of the gantry milling machine.

The production of ordinary lathes is nothing more than a childish thing for hundreds of professional and technical workers who produce all kinds of machine tools and dozens of mechanical engineers from the Soviet Union. Although there are many problems ahead, it is not because the technical strength of the whole factory is not enough, but because of the imperfections of various management systems built at the beginning of the factory and the human factors caused by workers changing the environment.

After the ball screw and its production, Yunfei began to stay in the production workshop of 91 heavy industry, followed the processing process of the most critical bed part, and continuously transferred in each production workshop with several skilled mechanical engineers responsible for this design.

All the people in the factory are serving this CNC lathe which is not sure whether it can 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 finishing, except that the gears in the spindle box used to transfer the speed also need some surface high-frequency quenching, they can go to the open workshop built by Yunfei, which has not been put into use. Everyone doesn't understand what to do for the final assembly.

You know, the specification of this dust-free assembly workshop is built by comparing with the electronic component production workshop of 91 heavy industry. The construction cost alone is four times that of other workshops!

After knowing that Yunfei's workshop was used to assemble CNC machine tools, Sun Lin and situ Heyun clamored to let Yunfei invest a lot of money in purchasing imported central air conditioners and turn the assembly workshop into a dust-free constant temperature workshop, which made Yunfei depressed.

For those precision CNC machine tools with five axes or more with high precision and cutting-edge, the constant temperature workshop has a great impact on improving the accuracy of the machine tool, but it has little impact on these ordinary CNC machine tools.

After all, the processing level of high-precision CNC machine tools is a few tenths of a point μ The machining accuracy of ordinary CNC machine tools is calculated by wire. Light is the difference between two units, which is counted ten times.

In Yunfei's world, many CNC machine tool manufacturers list that their CNC machine tools can reach zero point 1 μ Production accuracy, but there is also a theoretical design accuracy. The actual machining accuracy can be guaranteed to a trace. It is definitely a CNC machine tool with quite good accuracy.

"Don't eat too much. Now it's the last fine grinding, otherwise a lot of stress will be generated in the cutting process and remain in the bed of the machine tool." Seeing that the grinder of the guide rail grinder was moving quickly in front and a large number of sparks were thrown out in the back, Yun Fei jumped out of his feet in a hurry.

Although the cutting capacity is large, the cutting speed is fast and the machining efficiency is high, Yunfei does not need efficiency at this time.

In production, especially in finishing, the more urgent it is, the easier it is to have problems. At this time, if there is a problem with finishing, this week will be wasted.

The ball screw factory is waiting for the test here!

Originally, the machining accuracy of ball screw in the operation process can also be carried out on the ordinary lathe, but the structure of ordinary machine tool is still very different from that of NC machine tool. The same ball screw can meet the design accuracy requirements on ordinary machine tools, but not necessarily on professional CNC machine tools.

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

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

Although the surface of the ball screw produced by the ball screw factory has reached Rockwell hardness of 58-62 degrees after high-frequency quenching, Yun Fei is very worried about wear in the process of heavy-duty cutting. After all, the accuracy of the ball produced now is really not guaranteed to match the ball screw.

"Pay attention to the machining sparks. You're doing the final finishing, not rough machining..." as the guide rail on the car factory's bed gradually becomes smooth, although the sparks behind the grinder are getting smaller and smaller, Yun Fei kept roaring.

This is the first CNC machine tool of Jiuyi heavy industry. It must be enriched in the precision machining workshop of Jiuyi heavy industry. Yun Fei doesn't want to use it for a few years. The first CNC lathe produced by himself has too much cutting force during the final finishing of the bed. The residual stress in the bed makes the guide rail of the machine tool bend, resulting in the decline of the accuracy of this machine tool with extremely significant symbolic significance.

Finally, under the roar of Yunfei, the bed of the first experimental NC lathe of Jiuyi heavy industry completed the final fine grinding and stepped off the workbench of the guide rail grinder under the hoisting of ten tons of traveling crane.

"Lao Zhao, Lao Gu, it's up to you now. Although the design accuracy of this CNC lathe is not high, I hope our Jiuyi heavy industry can reach the level far beyond the design accuracy requirements. Therefore, I hope you can grind the guide rail of the machine bed with your highest level. I don't require you to reach the accuracy above level 2, but I hope you can see the accuracy of level 4 or even level 3... "There was no problem in finishing, and Yun Fei breathed a sigh.