When will I have a long tassel?

A baler is a pressure machine that requires a lot of pressure to press materials such as scrap steel bars into sheets. These pressures will be transmitted to the body, and the pressure on the front-end mechanism will naturally not be small.

The pressure that the support shaft must withstand as part of the locking device can be calculated. In general, if the pressure on the support bearing is too large, the designer should consider increasing the diameter of the support shaft, that is, making it thicker to disperse the pressure.

Of course, another approach is to choose steel with higher tensile strength to replace ordinary steel, so that even if the support shaft is thinner, it can still withstand such pressure.

In mechanical design, shaft parts usually use No. 45 carbon steel. The tensile strength of this steel is 600 MPa, which is enough to cope with most application scenarios. When the pressure exceeds 600 MPa, the conventional solution is to thicken the shaft instead of replacing it with high-strength steel.

The reason for this is that on the one hand, the price of No. 45 carbon steel is much cheaper than high-strength steel, such as chromium-molybdenum, chromium-nickel alloy steel, etc., which can save costs. On the other hand, high-strength steel is also more difficult to process. It is difficult for ordinary turning tools, grinding tools, etc. to process high-strength steel. Tools with higher hardness must be used. The price of such tools is often very high. Some ordinary machinery factories cannot even find such tools. .

For this kind of scrap metal baler, it is more cost-effective to use a thickened ordinary steel support shaft than a high-strength thin shaft. However, the designer chose this unreasonable design. This is to give counterfeiters Digging a hole.

Not to mention whether the counterfeiters could have imagined that the support shaft of the Linyi machine was made of high-strength steel. Even if they had thought of it, it would be difficult for them to process such a shaft. This problem is not a problem at all for Linyi Machinery. When Linyi Machinery manufactured machine tools, no high-strength steel was used.

Another pitfall is these press releases sent by Tang Zifeng. It is categorically claimed that the reason for the failure of counterfeit products is insufficient processing accuracy. This provides a psychological hint to various copycat factories. Once the baling machine they build fails, they will subconsciously focus on the drawings and processing accuracy. pondering, while ignoring the issue of materials.

In addition, these press releases also make customers more distrustful of counterfeit products. As long as there is a problem with the counterfeit products, customers' confidence will collapse and they will turn back to Linyiji for purchase.

As for whether these copycat factories will eventually see through Linyiji's conspiracy and solve this problem, Tang Zifeng doesn't care.

Han Weichang told him that this kind of trick can only deceive people temporarily, but it is impossible to deceive people forever. The theoretical level of engineers in township enterprises is not very good, but they still have practical experience. After they hit the wall, they will naturally be able to guess. Find out the secret. What Tang Zifeng needed was just to make them stumble first, and then delay the time for them to build a qualified baler, thereby gaining a few months of sales for Linyi Machine.

After all, Zhao Xingwang also had a professional background. He was taken into a ditch by Tang Zifeng and couldn't climb out for a long time. Now that he heard that Xiao Wenjun had broken the window paper, how could he not think of the reason? He also guessed the intention of the press release. Thinking that he had been deceived by such a clumsy trick, he really had the urge to bump into the baling machine for some pleasure.

"Classmate Xiao, I admire him, I admire him." After Zhao Xingwang got over the initial anger, he felt a little calmer. He bowed his hands to Xiao Wenjun and said: "Classmate Xiao is really amazing, at such a young age... Alas, I have lived like a dog at this age."

"General Manager Zhao is too polite." Xiao Wenjun replied politely.

"Xingwang, you can't say that, you can be considered...a fan of the authorities." Wen Weiming also comforted him.

"Xingwang, do you know what's going on now?" Zhao Xinggen listened from the side.

He had a rough understanding of things like tensile strength, but he couldn't tell the details. In the past, he was mainly responsible for doing business and maintaining government relations, etc., and relied on Zhao Xingwang for all technologies. Seeing that Xiao Wenjun's few words made Zhao Xingwang suddenly enlightened, he was also very surprised.

Zhao Xingwang said: "Brother, I was deceived by that article in the newspaper. In fact, the problem is not the machining accuracy at all, but the support shaft of the front door of the baler of Linyi Machinery uses high-strength alloy steel, and we use It’s ordinary carbon steel, so their machine can be used no matter how it is used, but the shaft broke as soon as we started it.”

"So that's it." Zhao Xinggen was speechless. This question was actually so simple. He should have been able to think of it. Why was he led into a pit? This was not the time to reflect, so he asked, "What should we do now?"

Zhao Xingwang said: "We know what's going on. The solution is quite simple. One way is to use alloy steel. I guess using No. 40 chromium-nickel steel is enough. However, this kind of steel is not easy to find, and Turning and grinding are also troublesome. Another way is to make the shaft thicker, but in this way..."

He did not continue. The design of Linyi Machine's baler is a whole. If the support shaft is to be made thicker, it means that the entire front-end locking mechanism must be redesigned, the force must be calculated, and the convenience of opening and closing the door must also be considered. This It's not a simple matter. Zhao Xingwang has been doing these years by copying and testing other companies' machinery, and occasionally designing extremely simple devices. It is really difficult for him to design such a locking mechanism.

Seeing this scene, Wen Weiming smiled, turned to Xiao Wenjun and asked, "Wenjun, what can you do?"

"I think we need to redesign a front-end device." Xiao Wenjun said lightly.

"How about you help Mr. Zhao?" Wen Weiming said in a consultative tone.

Xiao Wenjun looked at Zhao Xingwang, turned over the drawing, then picked up a pencil and started drawing on the blank space on the back of the drawing. Zhao Xingwang didn't understand what Xiao Wenjun meant at first, and thought she was calculating some formula. When he discovered that the pencil in Xiao Wenjun's hand was open and closed, clearly showing that he was drawing a picture, he stepped forward and took a closer look. Stunned.

It turned out that what Xiao Wenjun was drawing was the overall design of the front-end locking device of the baler, which was designed based on the idea of ​​thickening the support shaft. She did not copy the original structure of the Linyi baling machine, but designed another structure that looks simpler than the original design, but is functionally the same.

The most commendable thing is that the scales she marked on the drawings completely match the original scales. In this process, she did not turn over the drawings to compare with the original scales, but relied entirely on the scales left when she just looked at the drawings. What a kind of ability to learn and memorize knowledge.

"That's it, still using No. 45 carbon steel, I guarantee there will be no problems with this device."

Xiao Wenjun finished the last stroke, threw the pencil on the trolley, then half-rolled the drawing, handed it to Zhao Xingwang, and said.

"Is this good?" Zhao Xingwang simply couldn't believe it. In just a few minutes, this little girl actually finished designing a front-end device.

By the way, it has been less than half an hour since Wen Weiming brought these students into this workshop. It only took Xiao Wenjun so much time to go from the earliest contact with the baler to the completion of the design of an important device. Are all college students today so good?

The drawing drawn by Xiao Wenjun is certainly not the drawing that will be handed over to the workers for production. She has only made the overall design of the device. The next step is to find other engineers to draw three views of the components one by one, and to write process documents before they can be sent to the workshop for production.

But the first step is the most difficult, because it has to take into account the force relationship, the cooperation between various parts, etc. Who can design it just by copying a pencil.

Wen Weiming knew the abilities of his student. He just said hello to Xiao Wenjun, hoping that she would help Zhao Xingwang design the drawings. However, even he did not expect that Xiao Wenjun's hands were so fast, and he could almost rely on his horse to wait. To describe it.

He took the drawing from Zhao Xingwang, looked at it roughly, then handed it back and said: "There is nothing wrong with this drawing. Xingwang, please hurry up and have someone draw it. Let me tell you, Wen Jun is We are a well-known talented woman in the Department of Mechanical Engineering. Let alone such a simple front-end mechanism, even a whole baling machine can only be designed by her in a day or two."

"Hey, this is great!" Zhao Xingwang was ecstatic, looking at Xiao Wenjun with countless little stars of admiration in his eyes. Of course, these little stars are all pure. After all, he is an uncle in his early 30s, and Xiao Wenjun is just a senior student.

Zhao Xinggen witnessed this process and was filled with emotion. He turned to Wen Weiming and said, "Wei Ming, your students are really amazing. Let's do this. I will ask someone to arrange it now and put one at Fuxian Building in Heling City." The table is not only to welcome you, but also to thank Classmate Xiao for helping us a lot, what do you think?"

Wen Weiming laughed and said, "Do you still need to ask? I brought these students here just to eat your big meal, Boss Zhao. To tell you the truth, our school is very poor, especially these students. It's rare to have a few good meals, so when I come to your place, I have to have a good meal."

"No problem!" Zhao Xinggen pretended to be generous and said: "It is my glory to be able to invite you, Professor Wen, and these talented people. As I haven't mentioned, abalone, lobster, and shark's fin are also indispensable. .”

Regarding pressure and pressure, many book friends have fully discussed it in the previous chapter. Megapascal is definitely a unit of pressure, but it is called pressure in the factory. What should we do? Orange looked at academic papers and it said how many megapascals the tensile stress is. But... this still doesn't seem to be the point, and it's not welding, right?