Smart Industrial Empire

The machining center test machine for the first test machine has a very small tool magazine, which can only hold 12 tools, which is far less than the minimum number of foreign tool magazines with 18 tools.This is mainly to reduce the difficulty and solve the problem of the positioning accuracy of the tool in the tool magazine as soon as possible in the experiment.

Sun Lin initially chose the solution of a fixed tool magazine, which is relatively easy technically.This is also the path taken by most of the domestic machine tools in China.Although this kind of tool magazine is easy to get started, it is now the development of the entire equipment.

However, this plan was rejected by Yun Fei as soon as it was proposed.

The fixed tool magazine is also called the bamboo hat magazine in the usual sense.The tool magazine is parallel to the main shaft, and its tool set number is always in one-to-one correspondence with the tool number.Since this kind of tool magazine has no tool pre-selection function, the tool magazine always stops at that position during the tool machining process. After the tool on the spindle completes the cutting process, the tool is installed on the tool holder, and the machining program can be called. The new tool moves to the position of the spindle for the tool change.

For machining centers that use this kind of tool magazine for tool change, the tool change time generally exceeds eight or even ten seconds.This is too inefficient for some high-volume small parts whose production time will not exceed 1 minute.

The disk type tool magazine chosen by Yunfei is also the most used tool change form in the world.The tool magazine is perpendicular to the main shaft. Every time a tool needs to be changed, the tool holder is controlled by air pressure and rotates downward by 180 degrees to be parallel to the main shaft. Grasp the handles of the two knives, and then under the control of air pressure, the manipulator that grabs the knives descends to the set tool change point, rotates [-] degrees, and then installs the knives into the tool holder and the spindle, the spindle and the tool holder The air pressure at the same time grasps the tool tightly, the manipulator releases it, and then returns to its original position.Thereby complete the whole tool changing process.

Although this system of controlling tool change through cam mechanism control is technically several times more difficult than the hat-style fixed tool magazine technology, the tool change time is several times faster than the hat-style tool magazine.The fastest tool change time can reach 0.8 seconds!This is because the tool is randomly corresponding to the tool holder number, the system can memorize the position of each tool and update the data in real time.This involves the signal response between the user's macro program and the pmc. This is the NC macro program set in the system converted by Jiuyi Heavy Industry. By reading and using system variables, the status bits of the exchange conditions of various tools in the macro program are set. It is realized as the condition for judging the skip execution of the tool change macro program.

This includes two parts, the tool magazine pmc user program and the nc macro program (large-diameter tool selection and tool change program).Under the control of the processing program, the two parts of the program jointly complete the search for the tool number updated at any time according to the tool change command t code to perform accurate tool change.

Now that the booth is getting bigger and bigger, Jiuyi Heavy Industry's research team alone has more than [-] people, although among them, except for those engineers from the Soviet Union, they belong to Jiuyi Heavy Industry.Sun Lin, Situ Heyun and their disciples and grandchildren belong to the National Academy of Sciences, and some newly joined research institutes and factories belong to the military, but Jiuyi Heavy Industry is responsible for the salaries and bonuses of these people.

Of course, as a token of gratitude to the military for providing researchers, Yun Fei was offered to pay the military a symbolic 10 yuan a month as a thank you.There are still quite a few people with private goods, using the equipment and funds provided by Jiuyi Heavy Industry to study some small topics of their own. Yun Fei is aware of these.Didn't say anything.Wu Zhongda complained to Yun Fei several times, but Yun Fei stopped him.

Maybe these people from the military don't know that the things they research only need to apply for patents.But they all belong to Jiuyi Heavy Industry!This is clearly listed in the secret contract signed by the military.If these goods don't work, no problem, just let the military accompany the loss.Is it true that 10 yuan per month is given to those research institutes under the military for nothing?

Therefore, with the addition of these military scientific research personnel, Jiuyi Heavy Industry's first machining center.Only then can the test machine be manufactured so quickly.

The first test machine has a tool magazine with only twelve knives, which is suitable for processing some large and complex parts and complex molds.It is a common phenomenon that the structure of products processed by CNC machine tools is not very complicated. Yunfei believes that twelve cutting tools are completely enough.

"Check the coordinates of each knife again, and prepare for a quick tool change test!" Sun Lin is the project leader of the machining center designated by Yunfei, so he saw that Lin Yajun had completed the position compensation of all the knives in the z-axis direction , and cast an inquiring look at Wu Zhongda who was checking the programmed cycle tool change program, and after receiving an affirmative answer, he ordered Lin Yajun to check whether there was any problem with his processing parameter settings.

"Old Sun, let's start directly, there is no need to always check these are just processing parameter settings. What we need to test now is whether the tool magazine can be accurately positioned again after the rotation, and we don't want to start the cutting test right away... "Situ Heyun disapproved of Sun Lin's caution.

"Yes, Old Sun, let's take it step by step. Old Wu, you input the program into the control system and run it..." Yun Fei also said.

I don't know what Sun Lin is thinking, but testing the positioning accuracy of the tool magazine must be extremely serious.

"That's good. Start directly after you enter the program." Sun Lin shook his head with a wry smile, only to realize that he is not doing scientific research in the Institute of Mechanical Engineering, but in the experimental workshop of a private enterprise.

Wu Zhongda did not directly input the program into the PLC control panel, but handed the paper with the program directly to Lin Yajun.Lin Yajun just took a quick glance, didn't even look at the program, and used both hands to quickly input the program into the control system. In less than 2 minutes, the program input was completed.

"Wait..." Sun Lin saw that Lin Yajun exited the program input mode on the operation panel after completing the program input, and turned the knob on the operation panel for selecting various operation modes to automatic processing. He was about to press the start button, and hurriedly called Lin Yajun to stop.

"What's wrong?" Everyone looked at Sun Lin suspiciously, not knowing what problem he had discovered.

"The program you compiled, do you press the start button once after running it once?" Sun Lin asked Wu Zhongda suspiciously. Although he is the leader in charge of the entire project, his main experience is related to machinery , I have a deep understanding of general processing, but I really don't know much about the programming of CNC machine tools.

This time the tool magazine positioning test, the preliminary plan is to let the whole testing machine under the control of the numerical control program, with the fastest tool changing speed to conduct a hundred tool change tests on the entire tool magazine.This means that the entire tool magazine has to rotate one hundred times, and the automatic tool change mechanism has to run continuously for [-] times.

There are [-] knives in the entire tool magazine. Every time a tool is changed in the tool magazine, the positions of two adjacent tool pockets need to be rotated by [-] degrees.However, in the tool magazine system capable of tool pre-selection, after the last tool is replaced, the next tool in the program starts to move to the tool change position for waiting.In this way, the real tool change time is a process of the manipulator grasping the tool, changing the tool, and releasing the tool.

"..." Wu Zhongda and Lin Yajun heard Sun Lin's words, they looked at each other, and then stared at Yun Fei who was stunned aside with a wry smile.They knew that this old guy would only listen to Yun Fei's explanation about this matter.After all, Yun Fei is the real expert and the boss.

The group of people around them are all experts in machinery, but they are laymen in terms of numerical control system and numerical control program.They also stared at the two technicians who were said to be among the top technicians in China for CNC programming and machine operation with puzzled faces.This requires the machine tool to automatically execute a program of thousands of actions. Is it enough for a few lines?

Only Situ Heyun and his group of disciples and disciples turned their heads aside, with the expression that I don't know Sun Lin's old fellow.Sun Lin asked this question, it was embarrassing.Fortunately, this old guy still earns the qualification to be the boss with himself!

"Mr. Sun, this... There is a program called a subroutine or a subroutine in the CNC machining program. You only need to compile a cycle program in the subroutine, and then directly set the number of times to execute it in the main program..." Yun Fei Worried that Sun Lin would lose face, he pulled him aside and explained to him in a low voice.

Hearing Yun Fei's words, Sun Lin's old face blushed, and he secretly despised himself for a while, and his face returned to calm in an instant.

Industry specializing in surgery!Sun Lin comforted himself in his heart.

"Boom!" "Crack!" "Boom!"

"Boom!" "Crack!" "Boom!"

"Boom!" "Crack!" "Boom!"

……

After Lin Yajun pressed the green start button, three voices sounded rhythmically. "Bang!" is the sound of air pressure blowing loose the tool holder in the spindle hole and the tool holder hole in the tool magazine after the manipulator grabs the handle of the tool; The sound of sucking the handle of the knife tightly, and that "咵!" is the sound of the knife magazine turning.

All the people present were silently counting the number of times the voice sounded nervously.As long as 24 cycles have been heard before, it proves that there is no problem with the design this time. The remaining thing to do is to increase the speed of tool change. Now it takes 1.8 seconds for each tool change. Li Yunfei proposed There is a big gap in the tool change time within [-] seconds.

The rotation angle of the tool magazine is controlled by a hydraulically controlled indexing plate. This is the same principle as the simple fourth axis driven by the PMC module that Sun Lin and others worked on a while ago, but the accuracy of the rotary table is not very ideal. So they are progressing at this time.

"There are still two knives. If there are no accidents, we will succeed!" The three voices have sounded 22 times in a row. After changing the knives twice, the knife magazine with one positive and one negative two-wheel rotation can tell everyone, Is there a big problem with the rotary positioning error of the tool magazine... (to be continued...)