Intelligent Industrial Empire

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

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

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

The fixed tool magazine is also called the hat type tool magazine in the usual sense.The tool magazine is parallel to the spindle, and its tool pocket number always corresponds to the tool number one by one.Since this kind of tool magazine has no tool pre-selection function, the tool magazine always stops at that position during the tool processing. After the tool on the spindle completes the cutting process, the tool can be loaded on the tool sleeve to call the processing program. The new tool moves to the position of the spindle for tool change.

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

The disc-type tool magazine selected by Yunfei is also the most widely used tool changer in the world.The tool magazine is perpendicular to the spindle. Every time a tool is to be changed, the tool holder is controlled by air pressure and rotates down 90 degrees, parallel to the spindle. The air-controlled manipulator descends to the gripping position and rotates 90 degrees, and the manipulator directly Grasp the handles of the two knives, and then under the control of air pressure, the manipulator holding the tools descends to the set tool change point, rotates 180 degrees, and then installs the tools into the tool sleeve and the spindle. The air pressure in the tool sleeve simultaneously grasps the tool, releases the manipulator, and returns to the original position to complete the entire tool change process.

Although this system that controls the tool change through cam mechanism control is technically several times more difficult than the hat-type fixed tool magazine technology, the tool change time is several times faster than the hat-type tool magazine.The fastest tool change time can reach 0.8 seconds!This is because the tool corresponds to the tool pocket number randomly, and the system can remember the position of the tool and update the data in real time.This involves the signal response between the user macro program and PMC. This is the NC macro program set in the system modified by Jiuyi Heavy Industry to read and use system variables to change the status bits of the exchange conditions of various tools in the macro program. It is realized as the condition of the tool change macro program to judge the skip execution.

This includes the PMC user program of the tool magazine and the NC macro program (large diameter tool selection and tool change program).Under the control of the machining program, the two parts of the program together complete the search for the tool number updated at any time according to the tool change instruction T code to perform accurate tool change.

As the stalls are now getting bigger and bigger, the research team of Jiuyi Heavy Industry has exceeded 200 people. Although inside, except for those engineers from the Soviet Union, which belong to Jiuyi Heavy Industry, Sun Lin, Situ Heyun and their The disciples and grandchildren belong to the National Academy of Sciences, and the newly joined military research institutes and factories, but the wages and bonuses of these people belong to Jiuyi Heavy Industry.

Of course, as a gratitude to the military for providing researchers, Yun Fei took the initiative to pay a token of 100,000 yuan to the military every month.There are still many people carrying private goods, using equipment and funds provided by Jiuyi Heavy Industry to research some small topics that belong to them. Yun Fei saw this in his eyes and didn't say anything.Wu Zhongda found Yun Fei several times to complain, but was also stopped by Yun Fei.

Perhaps these people from the military still don’t know that as long as they have applied for patents, all of the things they studied belong to Jiuyi Heavy Industries!This is clearly listed on the secret contract signed by the military.If these goods quit, no problem, just let the military accompany the losses.Is it true that 100,000 yuan a month is given to those research institutes under the military?

Therefore, with the participation of these military scientific researchers, the first machining center of Jiuyi Heavy Industry can produce the test machine so quickly.

The first test machine has a tool magazine capacity of only twelve tools. For the processing of some large and complex parts and the processing of complex molds, the structure of products processed by CNC machine tools is not very complicated and common. Yun Fei thinks ten Two cutting tools are completely sufficient.

"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 tools in the Z axis direction , After looking at Wu Zhongda who was checking the cycle tool change program that had been programmed, he got an affirmative answer, and asked Lin Yajun to check his machining parameter settings again.

"Lao Sun, let's start right away. There is no need to always check these are just the parameter settings for processing. What we need to test now is whether the tool magazine can be accurately positioned again after it has been rotated, and the cutting test will not start immediately... …" Situ Heyun disapproved of Sun Lin's caution.

"Yes, Sun Lao, let's take it step by step. Lao Wu, you enter the program into the control system and run it to see..." Yun Fei said in the same way.

I don't know what Sun Lin thinks, testing the positioning accuracy of the tool magazine has to be extremely serious.

"Okay, then. Just start after you enter the program." Sun Lin smiled bitterly and shook his head, only to realize that he was not doing scientific research in the Institute of Mechanical Engineering, but in the experimental workshop of a private enterprise.

Wu Zhongda did not directly enter the program into the PLC control panel, but passed the paper with the program directly to Lin Yajun.Lin Yajun just glanced quickly, without even looking at the program. Using both hands, he quickly entered the program into the control system. After just two minutes, the program was entered.

"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 had to press the start button and hurriedly stopped at Lin Yajun.

"What's wrong?" Everyone looked at Sun Lin suspiciously, wondering what problem he found.

"This program you compiled, do you press the start button once after running it once?" Sun Lin asked Wu Zhongda in a puzzled manner. Although he is the head of the entire project, his main experience is all about machinery. , I have a deep understanding of ordinary machining, but I don't really understand the programming of CNC machine tools.

For this tool magazine positioning test, the preliminary plan is to make the entire test machine under the control of the CNC program to perform one hundred tool change tests on the entire tool magazine at the fastest tool change speed.This means that the entire tool magazine has to be rotated one hundred times, and the automatic tool changer has to continuously run 1,200 times.

There are twelve tools in the entire tool magazine. Each time the tool magazine changes tools, the positions of two adjacent tool sleeves need to be rotated 30 degrees.However, in the tool magazine system capable of tool preselection, after the previous 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 robot grasping, changing and loosening the tool.

"..." When Wu Zhongda and Lin Yajun heard Sun Lin's words, they looked at each other, then smiled bitterly and stared at Yun Fei who was stunned.They knew that this old guy would only be able to listen to this matter if Yun Fei explained it.After all, Yun Fei is the real expert and the boss.

The group of people around are experts in machinery, but they are laymen in CNC systems and CNC programs.They are also staring at the two technicians who are said to be ranked among the top Chinese technicians for CNC programming and operation.This requires the machine tool to automatically execute a program of thousands of actions. Is this just a few lines enough?

Only Situ Heyun and a group of his disciples, Sun Lin, turned their heads aside, with an expression that I didn't know the old Sun Lin.The question Sun Lin asked was ashamed.Fortunately, this old guy is still earning his qualifications to be the boss!

"Lao Sun, this...there is a program called a subprogram or a subprogram in the CNC machining program. Just compile a cycle program in the subprogram, and then directly set the number of executions in the main program..." Yun Fei Worried about Sun Lin's shame, 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 in his heart, and his face instantly became calm.

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

"Boom!" "Boom!" "Boom!"

"Boom!" "Boom!" "Boom!"

"Boom!" "Boom!" "Boom!"

...

After Lin Yajun pressed the green start button, three sounds rang rhythmically."Bang!" is the sound of the spindle hole and the tool pocket hole in the tool magazine after the manipulator grabs the tool handle; "Bang!" is the pressure of the spindle hole and the tool pocket hole after the manipulator changes the tool. The sound of sucking the knife handle tightly, and the sound of "Boom!" is the sound of the tool magazine turning.

All the people present were nervously counting the number of times their voices rang.As long as there are 24 cycles in the front, it proves that there is no problem with the design this time. The only thing left to do is to increase the speed of the tool change. Now every time the tool is changed, it actually takes 3.6 seconds. The non-proposed tool change time has a big gap within 1.8 seconds.

The rotation angle of the tool magazine is controlled by a hydraulically controlled index plate. This is the same principle as the simple fourth axis driven by the PMC module developed by Sun Lin and others some time ago, but the accuracy of the rotary table is not very ideal. So they just made progress at this time.

"There are still two knives, if nothing happens, we will succeed!" The three sounds have been sounded 22 times in succession, and the knives were changed two more times, and the tool magazine that turned forward and backward could tell. Everyone, are there any major problems with the rotary positioning error of the tool magazine...