industrial overlord

Chapter 321 Boring Machine Inspection

When Lin Zhenhua came to Luzhong Machine Tool Factory, he just caught up with Ma Shengfan and several workers and technicians who were inspecting a newly assembled large horizontal boring machine.Cen Youjun, Wei Jingwen and others from Hanhua Heavy Industry were also present at the inspection site. Everyone had smiles on their faces, obviously the inspection results were quite satisfactory.

A boring machine is a machine tool that processes prefabricated holes on a workpiece, and is generally used to process large box parts.The horizontal boring machine that Ma Shengfan and the others are inspecting is more than 3 meters high, and the working table is 3 meters long and 2 meters wide. It is considered a big guy.

This type of large horizontal boring machine is a traditional product of Luzhong Machine Tool Factory. In the past few decades, it is unknown how many machinery companies have equipped it.However, in recent years, under the pressure of imported CNC boring machines, the horizontal boring machines of Luzhong Machine Tool Factory have gradually become unsalable.This is also impossible. The boring machine is a kind of machine tool that requires high precision. The accuracy of manual positioning is not as good as that of CNC positioning. Naturally, customers prefer to choose CNC boring machines.

After the cooperation between Luzhong Machine Tool Factory and Hanhua Heavy Industry, Hanhua Machine Tool Company sent a group of technicians to work together with the technicians of Luzhong Machinery Factory to transform this traditional boring machine into numerical control.In terms of numerical control technology, Lin Zhenhua had a very early layout. Hanhua Machine Tool Company has reserved a lot of numerical control technology, and now it happens to be applied on the platform of Luzhong Machine Tool Factory.

What Lin Zhenhua sees now is the first CNC horizontal boring machine produced after transformation.

According to the production specification, after the machine tool is assembled, it must be inspected. The inspection items include reliability, static stiffness, idling vibration, thermal deformation, anti-vibration cutting, noise, vibration, positioning accuracy, spindle rotation accuracy, and linear motion. Inhomogeneity and machining accuracy, etc.

These test items are commonplace for Luzhong Machine Tool Factory.But for Hanhua Machine Tool Company, it is relatively unfamiliar.There is still a threshold in the machine tool industry, and this threshold is these various specifications.Lin Zhenhua used Cen Youjun's Yonghe Agricultural Machinery Factory as a platform to set up a machine tool accessories company, but he dared not directly enter the field of complete machine tools because he could not cross this threshold.

The secretary of the factory department took Lin Zhenhua from the train station to the factory, and followed Ma Shengfan's instructions, and took him directly to the assembly workshop.Ma Shengfan was instructing several workers to fix the experimental workpieces on the workbench. When he saw Lin Zhenhua coming in, he raised his head and shouted affectionately: "Manager Lin, you came just in time. We are carrying out the last test. If this One pass and we're going to cut the ribbon."

Lin Zhenhua stepped forward to shake hands with Ma Shengfan, but Ma Shengfan avoided him: "No, my hands are full of oil."

Lin Zhenhua smiled and said, "Why, Director Ma, why are you doing it yourself?"

Ma Shengfan said: "I love doing this kind of work. You wait for me for a while, I'll be fine soon."

Lin Zhenhua stepped aside, stood next to Cen Youjun, and asked, "Platoon leader, how is it? Did the test go well?"

Cen Youjun nodded and said: "It went very smoothly. The technical strength of the Luzhong factory is undeniable, and the quality of the workers is also high. However, our people are not ashamed. Yang Wenyong followed him to do the assembly, and even the masters praised him with their thumbs up." .”

"Yang Wenyong?" Lin Zhenhua asked strangely, "How does he understand this?"

Cen Youjun said: "This child is now a teacher, and he knows everything. This time, he really showed his face to our Hanhua machine tool."

Yang Wenyong is now the best machine tool assembler of Hanhua Machine Tool Co., Ltd., and his skills are practiced with countless old German machine tools.In the repeated assembly practice, he summed up a lot of tricks, and indeed, as Cen Youjun said, he was able to comprehend by analogy.

After Hanhua Machine Tool cooperated with Luji, Yang Wenyong went to Luji to participate in machine tool assembly.On Luji's side, there are more than a dozen old fitters who have been engaged in machine tool assembly for many years, and they are all very experienced.At first, everyone just treated Yang Wenyong as an apprentice and asked him to do some auxiliary work.Yang Wenyong doesn't mind, he does what he is asked to do, but when he is free, he always follows the masters to observe their every move, and then confirms it with his own experience.

Assembling a machine tool is delicate work.Each part of the machine tool is allowed to have a certain tolerance during processing. When they are assembled together, the tolerances on each part will accumulate, which will affect the geometric accuracy of the machine tool.Skilled assemblers need to constantly measure the mutual position between parts during the assembly process. If it is high, it needs to be shoveled off with a scraper; if it is low, it is necessary to add a small spacer.As for how to add and subtract, it depends entirely on the experience of each person.

In the process of assembling this large boring machine, Yang Wenyong gave full play to his assembly experience, and even corrected the mistakes of Lu Ji's master craftsmen several times, which won the praise of everyone.

While talking, the boring machine over there has already started working.The boring tool rotates at high speed, penetrates into the depth of the workpiece, and brings out beautiful chips.The technicians and workers around nervously observed the working condition of the boring machine and evaluated its vibration, noise and other indicators.After a hole was cut, two technicians ran forward quickly and began to measure the machining accuracy with tools such as micrometers.

"1000 mm deep hole processing, the hole pitch error is 0.02 mm!"

The technician announced the test result loudly, and there was a warm applause at the scene.Ma Shengfan happily ran to Lin Zhenhua's side, patted Lin Zhenhua's shoulder with his greasy hand, and said, "That's great! It's really good!"

Because Lin Zhenhua had just returned from a meeting in Beijing, he was wearing a new suit, and Ma Shengfan's suit turned into a rag.However, Lin Zhenhua didn't mind, and just asked with a smile: "Director Ma, I don't quite understand what this indicator means."

In fact, Lin Zhenhua still knows something about indicators such as the accuracy of machine tools. What he doesn't know is the significance of this indicator compared to Luji.Seeing Ma Shengfan's happy face, it must be a major improvement.

Ma Shengfan said: "Let me tell you, the hole pitch error of deep hole processing used to be almost 0.05 mm, but now it has been reduced to 0.02 mm. This is a remarkable thing. Our products have reached the international advanced level in no time. The domestic precision boring machines imported from Germany are only of this standard.”

"Congratulations, Director Ma." Lin Zhenhua said.

"This credit goes to Teacher Wei." Ma Shengfan said, and while speaking, he shouted to Wei Jingwen who was discussing control instructions with the operator in front of the console: "Mr. Wei! Come and talk."

Wei Jingwen came over with a smile and said hello to Lin Zhenhua.Ma Shengfan took Wei Jingwen's hand and said, "Mr. Wei, thank you very much. The automatic compensation mechanism you created is really great."

"Not yet, I haven't reached my ideal state yet." Wei Jingwen said modestly or conceitedly.

Seeing Lin Zhenhua's confused look, Ma Shengfan introduced Lin Zhenhua with gestures:

It turned out that the machining accuracy of deep holes on boring machines has always been a major technical problem plaguing Luji.The deep hole processed by the boring machine can sometimes reach a depth of one or two meters, which is equivalent to extending a boring tool from the headstock for one or two meters before processing.When the boring tool shaft is stretched out too long, there will inevitably be a certain deformation, mainly due to the sagging caused by its own weight, which is called the "bow head" phenomenon of the boring tool in the factory.

The boring tool is originally processed against the middle line of the boring hole. Once the "head down" occurs, the machined hole will deviate from the correct position, and the machining accuracy will be affected.

In the past, when encountering this kind of situation, it was all based on the experience of the boring machine operator to correct it. For example, the position of the headstock was raised a little bit, so that the boring tool just landed on the correct position after "lowering its head".However, this kind of artificial compensation is too much affected by the operator's personal ability, and the accuracy is not stable enough.

Wei Jingwen led his electronic team to develop a set of automatic compensation mechanism after a lot of field measurements. It is controlled by the chip on the machine tool and automatically adjusts the axis of the boring tool according to the length of the boring tool. The position of the ram at the back is used to compensate for the "low head" of the boring tool.The test just now shows that this compensation mechanism has played a role, and the machining accuracy of the boring machine has been greatly improved.

"It seems that we still have a lot to learn." Ma Shengfan said to Lin Zhenhua with emotion, "It turns out that we don't know CNC, and the way to compensate the accuracy is to add shims, at best, add a bracket to support the boring shaft. Wei What program did the teachers use, and they solved it all at once, which is really amazing."

Lin Zhenhua said with a smile: "I talked with Manager Cen just now, and he said that we have a lot to learn. Luji's production experience is what we lack. Through the cooperation with Luji this time, we have also learned a lot. thing."

"Hehe, what are you and us? We are now a family." Cen Youjun said with a smile on the sidelines, "The next step I plan to bring all the Xunyang team over is to fully report to the director of Ma Factory and the masters of Lu Machinery Factory. Learn and strive to come up with more new products.”

Ma Shengfan said: "Okay, that's all for today's test. Old Wang!"

Technical section chief Wang Haisheng responded: "Director Ma, what are your orders?"

"You sort out the relevant information. I will take Manager Lin, Manager Cen, and Teacher Wei to dinner first, and you will take the workers there together." Ma Shengfan said.

"Okay, Director Ma, you can go." Wang Haisheng agreed.

Ma Shengfan pulled Lin Zhenhua and said, "Let's go, Manager Lin, we won't go home until we're drunk."

　…I had a morning meeting in the morning, and continued the meeting at 01:30 in the afternoon. I rushed to write out a chapter in the middle. I was a little rushed and didn’t think enough, sorry.There should be an update tonight.In the past two days, I have seen many readers asking when it will be updated, and I am really touched.The ancients said: The so-called home means that there is someone waiting for you.Orange is really ashamed, and I hope to resume normal updates in a day or two.

　　
　
(End of this chapter)