Chapter 374: Comprehensive backward technology

"Professor Cai, please comment. What kind of technical level can my students achieve by using the material of your school's laboratory to sinter this two-color metal ring?"

As soon as Ye Qing entered, he saw a middle-aged man in a blue suit with some acne marks on his face. He was laughing like a slot machine and laughing at the young student beside him.

In the hands of the student, there was a metal ring that attracted Ye Qing's attention.

This is a metal ring with a square cross-section, the size of which is equal to that of an ordinary bracelet.

The metal ring sintered in the powder metallurgy laboratory is naturally processed by powder metallurgy technology. But this metal ring was half golden and half silver.

The most important thing is the intersection of the two colors, without any trace of splicing and polishing, it is completely integrated.

"It's ... powerful." The leader of Zhongyun University is Professor Cai Chenning. It is not known at this moment whether the temperature emitted by the sintering furnace in the room is too high, or other reasons. Anyway, Professor Cai Chenning's forehead was already covered with fine beads of sweat.

However, here at the Japan University of Technology, all looked calm, no sweat on his forehead.

"Can you also invite your school to show us the powder metallurgy technology?" Professor Kobayashi, led by the Japan University of Technology, bent over to make an invitation gesture: "It is not necessary that the two metals are sintered together. Yes, as long as your school thinks it is advanced. "

Another defeat ...

The green bars on Professor Cai Chenning's forehead bounce back and forth.

In terms of rankings, Japan University of Technology is undoubtedly much stronger than Zhongyun University. However, Professor Cai Chenning had previously thought that this academic exchange was not the most advanced national industrial laboratory technology competition between the two countries.

It ’s all college students, even if the technology gap does not mean that Zhongyun University, there is nothing that ca n’t be used to open the eyes of the students.

However, the fact turned out to make Professor Cai Chenning's heart jump out.

Up to now, there have been seven technical competitions for both size and size. As a result, Zhongyun University only pulled back one round.

Sure enough, they lost a game in the morning, and found it back in the afternoon.

In the afternoon, we visited the powder metallurgy laboratory. Professor Xiao Linjing, who was led by the team, couldn't wait for one of them to look down upon the students and use the materials in the laboratory to give their students in the mechanical engineering department a good lesson.

Sintering of dissimilar metals.

In the field of industrial processing, such a problem is often encountered.

As the saying goes, it ’s not the same thing to do different things, and the same applies to the metal welding industry. Different metals have to be welded forcibly because of the difference in melting point and characteristics. They will definitely fall to the ground because the strength of the weld is too low.

Welding of dissimilar metals is extremely difficult. Not only do we need to have a deep understanding of metal materials, we can take out various flux solutions according to local conditions, but also master the master-like welding technology to weld industrial parts with qualified strength.

Those who master this technology are not all babies that major factories compete with each other.

In powder metallurgy, sintering of dissimilar metals is also a major challenge.

Because of the different melting points of metals, it is necessary to add a layer of adhesive that can bind the two materials at the junction of the two metals. In this way, if you want to sinter a qualified product, you often have to scrap a dozen products.

The inherent shortcomings are destined to be a very small and very deep processing technology, whether it is dissimilar metal welding or dissimilar metal sintering.

But just this afternoon, a graduate student of Japan University of Technology used two kinds of metal powders, silver and copper, to successfully sinter a perfect dissimilar metal ring without adding a binder.

This product is not a bastard.

In order to prove this, the student had already handed over his work to Zhongyun University and tested it with a tensile tester.

"Professor Xiao Linjing, it's not too early. I think the students in your school must be hungry. Tonight, the cafeteria specially prepared a piece of roast duck for everyone. Why not let the students eat and talk?" Professor Cai Chenning started helpless Sloppy eyes also admitted in disguise that the students of Zhongyun University could not come up with similar powder metallurgy technology.

The Japanese University of Science and Technology sends a graduate student, so according to the established rules, Zhongyun University can only send graduate students or university students.

Professor Cai Chenning cannot always play in person.

"Not hungry or not." Kobayashi raised his head and shot two proud rays of light in his eyes: "Tanaka, you talk to them about the firing skills of different metals."

The student holding the metal ring looked up proudly and looked around the audience: "The physical properties of different metals are very different. The one-time sintering technique I used is the principle of basic gradient joints. First put the two metal powders one by one The mold is pre-pressurized and formed. UU Reading www.uukanshu.com then uses an electric furnace to sinter, which requires the most stringent temperature control. "

"The melting point of silver is 961 degrees and the melting point of copper is 1083 degrees. How to find the balance point of the melting points of these two metals is that the pressure of the two materials is different. The density of the gap between the materials determines the melting point. speed."

The students on Zhongyun University avoided Tanaka's eyes one by one.

If you lose, then lose. Who makes technology inferior?

Fortunately, the Tanaka student did not take the opportunity to show a wave of superiority, otherwise they would have the heart to find a seam.

Tanaka's people are good, not only telling the technical points, but also not hitting people.

This group of students is too naive. Japan University of Science and Technology came across the ocean and did not hit people. Isn't that in vain?

"just……"

"During operation, I found several problems."

The student named Tanaka suddenly changed his voice, and his tone became proud: "Your equipment is too backward, in our school's laboratory. The stamping machine used for pressing the embryo is the multi-angle CNC of Yamazaki Mazak Company. punch."

"Your equipment, even if the angle is not adjustable, even the impact coefficient is not adjustable."

"In our school, the scrap equipment piled in the warehouse is also more advanced than yours."

"There are also these metal powders. As early as the 1960s, Professor Ueda Ueda invented the preparation technology of ultrafine metal nanoparticles." Tanaka twisted the metal powder left on the twisted fingers: "But you still take this kind of metal powder Use something as coarse as flour. "