A baler is a type of pressure machinery that requires a lot of pressure to press materials such as scrap steel bars into sheets. These pressures are transmitted to the body, and the front-end mechanism is naturally not less stressed.

As part of the locking device, the pressure to be subjected to by the support shaft 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 distribute the pressure. Of course, another approach is to choose steel with higher tensile strength instead of ordinary steel, so that even if the support shaft is a little thinner, it can resist such pressure.

For mechanical design, 45 carbon steel is often used for shaft parts, which has a tensile strength of 600 megapascals, which is sufficient for most applications. In the case of pressures exceeding 600 megapascals, the conventional treatment is to thicken the shaft instead of replacing it with high-strength steel.

The reason for this, on the one hand, is that 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, the processing difficulty of high-strength steel is also greater, and it is difficult to process high-strength steel with general turning tools and grinding tools, and it is necessary to use tools with higher hardness, and the price of such tools is often very high, and some ordinary machinery factories can not even find such tools.

As far as this scrap metal baler is concerned, it is far more cost-effective to use thickened ordinary steel to support the shaft than to use a high-strength thin shaft, but the designer chose this unreasonable design, which is digging a hole for the imitator. Not to mention whether the imitators could have imagined that the support shaft of the Linyi machine was made of high-strength steel, even if they did, it would be difficult for them to process such a shaft. This problem is not a problem at all for Linyi machine, when Linyi machine makes machine tools, what high-strength steel has not been used.

Another pit is these press releases sent by Tang Zifeng. Among them, it is conclusively claimed that the reason for the failure of counterfeit products is that the processing accuracy is not enough, which provides a psychological hint to the copycat factories, once the baler they make fails, they will subconsciously ponder the drawings and processing accuracy, and ignore the problem of materials.

In addition, these press releases also caused customers to have more distrust of the copycat products, and as long as the copycat products went wrong, the customer's confidence would collapse, and they would turn back to purchase from Linyiji.

As for whether these copycat factories will eventually see through the conspiracy of Linyi and solve this problem, Tang Zifeng doesn't care. Han Weichang told him that this kind of little trick can only be fooled for a while, and it is impossible to fool people for a lifetime, and the theoretical level of engineers in township enterprises is not very good, but there is still practical experience, and after they touch the nail, they can naturally guess the mystery. What Tang Zifeng needs is just for them to plant a heel first, and then delay the time for them to build a qualified baler, so as to win a few months of sales for Linyi machine.

Zhao Xingwang was also from a professional class, and he was taken to the ditch by Tang Zifeng before, and he couldn't climb out for a long time. Now that Xiao Wenjun has broken the window paper, how can he not think of the reason, and even guess the intention of the press release. Thinking that he had been deceived by such a clumsy trick, he really had the urge to hit the baler headlong to find a good time.

"Xiao, admire, admire. Zhao Xingwang calmed down a little after getting over the initial anger. He arched his hand to Xiao Wenjun and said, "Classmate Xiao is really amazing, he is young...... Alas, I've lived my age to a dog. ”

"Chief Engineer Zhao is too polite. Xiao Wenjun replied politely.

"Prosperity, you can't say that, you're also a ...... The authorities are fascinated. Wen Weiming also comforted.

"Xingwang, do you know what's going on now?" Zhao Xinggen listened to the side. He has a general idea of what tensile strength and the like, but he can't go into details. In the past, he was mainly responsible for doing business and maintaining government relations, and technically relied on Zhao Xingwang. Seeing Xiao Wenjun's few words, Zhao Xingwang was stunned, and he also felt very surprised.

Zhao Xingwang said: "Brother, I was deceived by the article in the newspaper, in fact, the problem is not in the machining accuracy at all, but the front door support shaft of the baler of the Linyi machine uses high-strength alloy steel, and we use ordinary carbon steel, so there is no problem with how to use their machine, and we will break the shaft as soon as we open it." ”

"I see. Zhao Xinggen was speechless. This question is so simple, he should be able to think of it, how did he be taken to the pit? This is not the time to reflect, he asked, "Then what should we do now?"

Zhao Xingwang said: "I know what's going on, and the method is quite simple. One way is for us to use alloy steel, which I estimate is enough to use No. 40 chromium-nickel steel. However, this steel is not easy to find, and it is also more troublesome to do turning and grinding. The other way is to make the shaft thicker, but this way ......"

He didn't go on. The design of the baler of the Linyi machine is a whole, if the support shaft is made thicker, it means that the entire front-end locking mechanism must be redesigned, the force must be calculated, and whether it is convenient to open and close the door is considered, which is not a simple matter. Zhao Xingwang has been imitating other people's machines all these years, and occasionally making some designs is also an extremely simple device, so it is really difficult for him to design such a locking mechanism.

Seeing this scene, Wen Weiming smiled, turned his head to Xiao Wenjun and asked, "Wenjun, do you have any way?"

"I felt the need to redesign a front-end unit. Xiao Wenjun said lightly.

"Why don't you help Chief Engineer Zhao?" Wen Weiming said in a consultative tone.

Xiao Wenjun looked at Zhao Xingwang, casually turned over the drawing just now, and then picked up a pencil and drew it in 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, but when he found that the pencil in Xiao Wenjun's hand was wide open and closed, it was clearly drawing, so he stepped forward and looked at it, and couldn't help but be stunned.

It turned out that what Xiao Wenjun was drawing was the overall design of the locking device at the front end of the baler, which was designed according to the idea of thickening the support shaft. Instead of copying the original structure of the Linyi baler, she designed another structure that looks simpler than the original design but is functionally identical.

The most commendable thing is that the scale she marked on the drawing completely matches the original scale, and in this process, she did not turn over the drawings to compare the original scale, but completely relied on the memory left when she looked at the drawings just now, which is such a kind of ability to read and remember.

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

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

"That's good?" Zhao Xingwang couldn't believe it. It only took a few minutes for this little girl to finish designing a front-end device. By the way, from Wen Weiming to walk into this workshop with a few of their students, it is less than half an hour now, Xiao Wenjun has only taken so much time from the earliest contact with the baler to the completion of the design of an important device, are the current college students so powerful?

The drawing drawn by Xiao Wenjun is, of course, not a drawing that was finally handed over to the workers for production. She just made the overall design of the device, and the next step was to find other engineers to draw the parts into three views one by one, and also write process documents, so that they could be sent to the workshop for production. But this first step is the most difficult, because it has to take into account the force relationship, the coordination between the parts, etc., who can just copy a pencil and design it.

Wen Weiming knew his student's ability, he greeted Xiao Wenjun just now, and he hoped that she would help Zhao Xingwang design the drawings, but even he couldn't imagine that Xiao Wenjun's hand was so fast, it could almost be described as relying on a horse. He took the drawing from Zhao Xingwang's hand, looked at it roughly, then handed it back and said, "This drawing is completely fine." Prosperous, you can quickly let people draw pictures. Let me tell you, Wen Jun is a well-known talented woman in our mechanical department, not to mention such a simple front-end mechanism, even if it is a whole packing machine, it will be a matter of one or two days for her to design. ”

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

Zhao Xinggen witnessed this process, and he was also full of emotion, he turned his head to Wen Weiming and said, "Weiming, your students are really amazing. In this way, I will let people arrange for me to set up a table in Fuxian Building in Heling City, not only to catch you up, but also to thank Xiao for helping us a lot, what do you think?"

Wen Weiming laughed and said, "Then do you still need to ask? I brought these students here to eat Boss Zhao's dinner." To tell you the truth, our school is very poor, especially these students, it is rare to eat a few good meals throughout the year, and when you come here, you have to eat a good meal. ”

"No problem!" Zhao Xinggen pretended to be bold and said, "I can invite you Professor Wen and these proud sons of the sky, that is the brilliance of my Zhao Xinggen." What I didn't say, abalone, lobster, shark fin, all the same. ”