"Prosperity, haven't you figured it out yet?"

Longhu Machinery Factory, Zhao Xinggen, the director of the factory, walked into the workshop with a few people, came to his younger brother Zhao Xingwang, who was squatting in front of the baler in a daze, and asked softly.

It has been a week since the failure of the imitation baler, and Zhao Xingwang is still pondering what the problem with this baler is. Relying on his previous friendship with Yu Changfa, he went to the packaging workshop of Yuntang Recycling Materials Company more than a dozen times, and measured the size of the Changying brand baler several times. Of course, Yu Changfa would not allow him to disassemble the baler again, so he could only guess from the appearance of some parts hidden inside.

Zhao Xingwang focused on the precision and shape of the support shafts, and he asked the workers to make more than a dozen different support shafts, some smooth, some rough, some straight, some spindle-shaped, and some dumbbell-shaped, and each shaft was assembled on the baler for experiments to determine whether it conformed to the original factory design.

In addition to the support shaft, other related components, Zhao Xingwang also let people remanufacture, in just one week, the cost of manufacturing various parts alone is about to tens of thousands.

Zhao Xingwang is so persistent in finding out the problem, in addition to the reason for his diligence and studiousness, there are two purposes. The first is of course to stop loss, if he can find out the reason for the broken shaft of the baler, not only can the baler be repaired and sold, but the dragon machine can also develop new business, and then be able to make up for the losses caused by the previous compensation to Yuntang Company with the profits of the new business. The second point is that he must understand the truth of this, which is not only related to whether a qualified baler can be imitated, but also involves the imitation of other equipment in the future.

A baler failed to imitate, and the loss before and after was more than 300,000, which was still within the range that the Zhao brothers could bear. If the same problem had been with other subsequent devices, and the imitation failed again and again, the brothers would have gone hungry.

"Brother, I still can't find the reason. Zhao Xingwang raised his head and said to his brother. His current appearance is really distressing to look at, with messy hair, a full beard, a thin face, and red eyes. No way, this kind of experiment is really time-consuming and laborious, every time you have to disassemble the relevant parts and assemble them back, and then turn on the machine to test the pressure, and toss it for an hour or two. Noise and other tosses are still secondary, and the most important thing is tiredness......

"Boom, look who's coming. Zhao Xinggen pointed to his side with his hand and said to Zhao Xingwang with a smile.

Zhao Xingwang raised his eyes, quickly stood up, and greeted with joy: "Brother Wen, you are back!"

The one known as Brother Wen is about the same age as Zhao Xinggen, wearing a suit, glasses on the bridge of his nose, and a polite appearance. This person is Zhao Xinggen's junior high school classmate, named Wen Weiming. At that time, Zhao Xinggen dropped out of junior high school, Wen Weiming went to high school, and then as the first college student after the resumption of the college entrance examination, he entered the Department of Mechanical Engineering of Tsinghua University.

The chief engineer of Longhu Machinery Factory is Zhao Xingwang, but Zhao Xingwang's two brushes can still be dealt with when encountering ordinary technical problems, and if they are a little troublesome, they can only turn to foreign aid, and Wen Weiming is Longji's hardcore foreign aid.

This time, the dragon machine failed to imitate the packer, and Zhao Xinggen considered asking Wen Weiming to come back for guidance. But the time that Yu Chang sent him was only two days, and he didn't have time to find Wen Weiming at all. After paying the compensation to Yu Changfa, Zhao Xinggen called Wen Weiming and told him about the matter, but many of the situations on the phone were not clear. Wen Weiming told Zhao Xinggen that he would take a group of students to Jingnan for a winter vacation internship in a few days, and he would go to Longji to have a look.

At this time, Wen Weiming came with his own students, and there were three men and one woman with Wen Weiming, all of whom were students of the 91st level of the Department of Mechanical Engineering.

"Xingwang, how did you do this?"

Wen Weiming did not dislike Zhao Xingwang's oily hands, shook hands with him, and then pointed to his face and asked with concern. Zhao Xingwang is two years younger than Zhao Xinggen, and when he was a child, he was a follower behind Zhao Xinggen, Wen Weiming and others, and Wen Weiming was very familiar with him.

Zhao Xingwang said dejectedly: "Brother Wen, I'm in trouble here again. As for this baler, I don't think there is any problem with the design, but the locking mechanism at the front end just can't be locked, and the shaft is broken repeatedly. I've checked all the reasons and couldn't find anything. ”

"Broken shaft? That should be a design problem, is the pressure exceeding the bearing limit of the shaft?" asked Wen Weiming.

Zhao Xingwang said: "No, we are built according to the packing machine of Linyi machine, except for the shell, nothing else has been changed." But their machine has been used in Yuntang Company for almost a month, and there is nothing at all, and our machine will play a dozen bags at most, and the shaft will be broken. ”

"Is there such a thing?" Wen Weiming frowned, of course he knew that Longji started from a cottage, which was a common thing in Jingnan. Wen Weiming still recognizes the manufacturing level of the dragon machine, and knows that it is impossible to imitate even such a machine.

"What kind of problem are you analyzing?" Wen Weiming asked.

Zhao Xingwang said: "Our initial analysis is whether the imitation test is wrong, which place is different from the original factory. It was checked many times later and this possibility was basically ruled out. The remaining possibility is the problem of machining accuracy, Brother Wen, you see, there is a newspaper here, there is an article on it, it is said that the reporter interviewed the engineer of Linyi machine, and their engineer said that if the machining accuracy is insufficient, there may be such a broken shaft failure......"

Wen Weiming took the newspaper handed over by Zhao Xingwang, looked at it a few times, and then handed it to his students and said, "You all should take a look at it and tell me your opinions." ”

"Insufficient machining accuracy will cause bearing breakage?

"How can a bearing break, at most the ball is deformed? If it's a shaft...... But what does this have to do with machining accuracy?"

"There is no need to use a grinding machine to process such a shaft......

The three boys read the newspaper and found it incredible. However, in front of the teacher, they don't dare to talk too much, what if there is really something they haven't thought through?

"Wen Jun, you can also take a look. Wen Weiming shouted to the only girl.

Just now, several boys were listening to Wen Weiming chatting with the Zhao brothers, but the girl picked up the drawings of the baler at some point, put them on a small cart where the workpieces were put and watched, and took a drawing pencil to write and draw on the drawings, quite focused. Hearing the teacher call herself, she turned her head, reached out and took the newspaper from a boy's hand, glanced at the contents of the newspaper, and then inadvertently swept her gaze over a signature under the headline, and couldn't help but laugh out loud.

Because she came out for an internship, this girl wore a half-worn work clothes, and her hair was curled on the top of her head to make a ball, which was no different from the ordinary female workers in the workshop, and it was not particularly eye-catching. But when she smiled, the light in her eyes flowed, and the smile on her face was like a flower, which immediately made everyone look a little stupid. A few boys even grinned at the back of their heads, smiling dumbly, like a canopy brother at a peach banquet.

"Her name is Xiao Wenjun, and she is the best student in the first class of our mechanical department. Wen Weiming introduced to the Zhao brothers, and after that, he smiled and asked Xiao Wenjun: "Wenjun, what, is this article ridiculous?"

"No, no, no. Xiao Wenjun raised a hand, slightly blocked his mouth with the back of his hand, tried to hold back his laughter, and said, "Teacher Wen, I'm sorry, I just saw the name of this reporter, so I thought it was funny." ”

"The reporter's name?" Zhao Xingwang was stunned, "I remember that the signature of this article is this newspaper's correspondent Bao Nana, does this name have any special significance?"

Xiao Wenjun said: "I know this person, from elementary school to the first year of high school, we are both in the same class, and she is my best friend. However, she is a person...... , uh, anyway, what she wrote, don't believe it. ”

Speaking of this, she couldn't help but cover her mouth and snicker, and she didn't know why this girl's laughter was so low.

"Don't believe ......" Zhao Xingwang grinned, how strange this Bao Nana must be to make people make such an evaluation of her. A journalist, what he writes can't be believed, is this still a reporter?

"Wen Jun, in this way, do you think the reason for the broken shaft of the baler is not a processing problem?" asked Wen Weiming.

"Of course not, it has nothing to do with machining accuracy. Xiao Wenjun said with certainty. When it comes to technical issues, her eyes become very clear, and it is a look of wisdom.

"So, what do you think is the reason?" Wen Weiming asked again.

"The problem with steel. Xiao Wenjun said, she held up the drawing she was looking at just now, pointed to several schematic diagrams and a series of formulas on it and said, "I have just made calculations, according to the design of this equipment, under extreme conditions, the tensile stress of the support shaft of the front end mechanism will exceed 1000 megapascals, and the highest may even reach 1200 megapascals."

"Director Zhao, they are now using No. 45 carbon steel, if I remember correctly, the standard tensile strength of this steel is 600 megapascals, and the positive and negative fluctuations are about 100 megapascals, which means that the maximum can only reach 700 megapascals. In this way, it doesn't matter when pressing some low-strength scrap, but if the high-strength steel is pressed, the tensile stress of the support shaft far exceeds the highest tensile strength of the material, and it will definitely break, which has nothing to do with the machining accuracy. ”

"1000 megapascals, my mother is a ...... of Sippies"

Zhao Xingwang didn't squirt out a mouthful of old blood.

Nima, is it good not to bring such a pit person? Co-authoring this Changying brand packing machine from design to marketing is pit after pit, it is purely a pit goods.