Chapter 265

"Bang!"“ PA! "“ 咵! "

"The last knife..." all around the testing machine without a shell passport, staring closely, waiting for the last knife change in the first turn of the reverse rotation.

There is no problem with the forward rotation of the magazine. Now the reverse rotation is about to be completed. As long as the tool can be successfully completed under the clamping of the manipulator, it shows that the cumulative error of the magazine in rotation is not very large.

After more than two months of theoretical design and more than half a month of production and manufacturing, all the work is waiting for this tool change.

"Switch to manual mode..." when the first tool stopped at the tool change position again, about to change from horizontal state to vertical state, Yun Fei said to Lin Yajun, who was staring at the manipulator about to move.

Hearing Yunfei's words, Lin Yajun hurriedly pressed the pause key, and the index finger and middle finger of his right hand pressed the pause key and start key respectively. First press the start button, and then press the pause button immediately. Two fingers slowly touch the buttons on the control panel.

The operation of NC machine tool can not be directly changed from automatic control to manual control in the process of program operation. Only by continuously switching between the pause key and the start key, can we achieve the purpose of manual control. However, those who can play like this are all experienced teachers who use them when debugging the program and when trying to cut and process. Theoretically, this operation is illegal and inconsistent with the regulations in the industry. It is easy to damage some sensitive control elements of NC system. If the frequency of pause and start is too high, it may even burn the control chip of the NC system!

However, in the processing of some complex products, it is easy to encounter some problems. If you stop the program and start processing again after the problem is solved, you need to start from scratch. Later, in order to solve such problems, some more advanced systems have the function of jumping section execution. However, at present, the Dragon CNC system transformed by Jiuyi heavy industry has not such a function.

The tool magazine test, especially the test in the initial stage, should be divided into many steps. All the people didn't have that patience. As soon as they came up, they set up the tool magazine to run for 100 cycles and conduct 1200 tool change tests.

Now when this makes everyone nervous, we can only use this illegal means for the CNC system.

"Bang..." the sound of the air cylinder pushing the handle of the knife raised everyone's heart to his throat.

"Bang!" As soon as the manipulator moved, the knife handle from the guide sleeve of the magazine fell down. Lin Yajun, who had just breathed a sigh of relief, "pa!" Slapped on the red and dazzling "emergency stop" knob.

"Alas..." a sigh sounded.

Everyone's face darkened.

"Sun Lao, it's all right. Isn't this the first experiment? Which can succeed from the beginning? If so, our country would have developed CNC machine tools with more than three axes. " Seeing Sun Lin, it seemed as if people had been drained of their energy and spirit. Yun Fei calmly comforted him with a face.

Yun Fei has long been psychologically prepared for such a thing as falling a knife.

The tool magazine of machining center is a difficult problem. Otherwise, it is impossible for China's domestic CNC machine tools to approach the foreign technical level on CNC milling machines, and in the selection of tool magazine of machining center, the hat type tool magazine with the least technical difficulty can only be used. Until later, with the accumulation of experience, it gradually developed towards the disc random magazine and the chain magazine with higher technical content and more tools.

"We have never manufactured the testing machine because of the problem of research funds, but theoretical research has been carried out for several years. Now we have just carried out the second round of knife experiment, and the knife has fallen..." Sun Lin said with a lonely face.

He was very confident in his team's theoretical design, but now he was hit by this knife drop.

"When each part of the front was tested separately, there was no problem, especially the knife drop problem that should not occur now. What do you ask about the assembly? How many questions have not been exposed? " Situ Heyun was also very depressed.

At present, the biggest problem is the control problem. The positioning of the cam mechanism controlling the tool magazine is inaccurate and the accumulated error is too large, which makes the manipulator fail to grasp the tool handle firmly at the fixed position, so that the tool handle will fall down when it moves.

"Xiao Lin, install knife 1, continue the test and record the data each time. Then let's analyze where the problem is. " Since the problem has appeared, it's useless to tangle again. It's better to continue the test. If you drop the knife once, you simply can't know what defects there are in this set of tool magazine and how many defects there are.

The test was carried out again, and the knife drop phenomenon became more and more frequent.

In the end, the tool handle was full of collision marks, the manipulator was also twisted and deformed, and the conical surface above the spindle conical hole of the machine tool was also pitted, so the test could only be terminated.

"Mr. Sun, why don't you ask the capital No. 1 machinery factory if it is interested in disc magazine and let's cooperate to build one?"

After the summary meeting of the first experiment, Yun Fei was depressed at Sun Lin and situ Heyun, who seemed to have been drained of his spirit. Is this old product from the machinery institute? The failure of this experiment is such a lost expression. Where are those scientific spirits who are not afraid of failure!

Since the end of the test, each link has been checked countless times, and the summary meeting has been held for several times. Whether it is modeling or sub item test, it is always unable to find out the cause of knife drop. Even Sun Lin personally measured the position of each tool change, which was no different from the theoretical design.

In desperation, Yunfei can only propose to let Sun Lin's team cooperate with the capital first machine tool factory. Perhaps the engineers in the capital first machine tool factory can help find out where these problems occur?

At the beginning of the research on the machining center of Jiuyi heavy industry, Sun Lin proposed to cooperate with the capital No. 1 Machinery Factory on this project, which can not only share the cost, but also make use of the capital No. 1 machine's rich experience in producing milling machines for decades. Finally, it was rejected by the capital No. 1 machine tool factory.

With the listing of the CNC milling machine of Jiuyi heavy industry, capital first machine has also launched its own CNC milling machine. However, for their CNC milling machines, the movement in the z-axis direction is the up and down movement of the whole worktable, not the up and down movement of the spindle. Moreover, the capital first machine did not adopt the Dragon CNC system produced by Huashu, but launched the capital CNC system with countless devil FANUC traces. In this way, it clearly stated its position.

Capital Yiji is a large state-owned enterprise with tens of thousands of people. They produce more than half of the milling machines in Chinese factories. How can we see a small factory built for one year? They believe that the self-developed things advertised by Jiuyi heavy industry are some backward technologies bought by Jiuyi heavy industry from abroad. Not qualified to cooperate with them in scientific research.

"No!" The two old goods didn't think about it and unanimously rejected Yun Fei's proposal.

The refusal of the first plane in the capital is the most shameless of these two old goods.

They contacted them at the beginning.

Now, at the insistence of Yunfei, 91 heavy industry takes a different route to tackle key technical problems than the capital one machine. In terms of the research on the machining center, the capital and adopt the fixed tool magazine, while the Jiuyi heavy industry adopts the random tool magazine. If the two companies cooperate now, it is tantamount to giving up the research results of Jiuyi heavy industry, which has spent several months and millions of funds.

How can two old goods who began to lose face in the capital do such a thing?

"If we don't cooperate, we can't continue this experiment... Several factories in Taiwan have begun to negotiate with some local governments to build factories in the mainland. It is estimated that their factories in the mainland will be established by may or June next year..." Yun Fei said to two tangled academicians.

Many CNC machine tool manufacturers in Taiwan have now begun public relations with the mainland government. CNC machine tool technology was originally a technology urgently needed in China, and the whole country is almost blank. If they fail to seize the market before their machine tools flood into the domestic market because of the lack of import intermediary fees, there is really no way out unless the CNC machining center produced by 91 heavy industry can have higher precision and lower price than those Taiwan funded enterprises.

"Give me another three months, no, two months, we will be able to solve these problems!" Situ Heyun said to Yunfei eagerly.

He is worried that Yunfei will reduce the research funds for CNC machine tools and look to those economically depressed countries in Europe for technology introduction when he is eager to seize the market.

If Yun didn't really do that, they would no longer be able to raise their heads in front of the grandsons of the first plane in the capital.

Although the CNC milling machine produced by capital first machine has various defects and low precision, it is really like what they said that they are independently developed! All technologies are domestic! Even if the CNC system has countless traces of ghost systems, but others use it for reference! It is also made in China. At least, the devil didn't sell technology to them!

Jiuyi heavy industry takes the road of independent research and development on CNC lathes and CNC milling machines, which makes them see hope. Finally, there will be a machine tool production enterprise that can resist the independent innovation and independent research and development of CNC machine tool industry in China. If Yunfei turns to foreign CNC machine tool technology, who will resist the national flag?

"I don't need three months, nor two months. You give me three days!" Sun Lin suddenly raised his head and smiled at Yun Fei. After that, he took situ Heyun and left the conference room of the technology department.

"..." Yun Fei was stunned. The old man reacted back and forth. The gap was too big