I've done whatever I want

Chapter 91 Thoughtful Man
The master Luo Gaogong was quite surprised by Xin Tong's understatement and general answer.

In this impetuous society, there are very few people who can always maintain the original intention of seeking knowledge!

Many college students no longer read books after they come out of school, even graduates from some famous 985 colleges are all exceptions. They are like birds flying out of a cage, yearning for a life like Zhu Bajie’s pigsty.

The young man in front of him is different, he is improving every day. Although he only has a high school diploma which is embarrassing, he is under the huge pressure of Monkey King fighting monsters, and he is full of endless passion for learning.

Judging from his work ability performance, he has at least learned the basic knowledge of MTBA, seven techniques and Six Sigma.

Obviously, this knowledge is a blank in college books and needs to be acquired through continuous learning in work practice.

Graduating from college is not the end of learning. Learning is undoubtedly a lifelong matter. On the track of life, a good university determines the lower limit of life. Setting the upper limit of life often requires vision and continuous enrichment of oneself. Those who have continuous People who learn well will win the long-distance race in life.

Hearing that Xin Tong was learning DOE knowledge, Luo Gaogong was full of emotion: "Xin Gong, study hard and make progress every day!"

He also said this sentence to himself. After graduating from Zhejiang University as a graduate student, he never gave up his studies.

Xin Tong was very shocked. Luo Gaogong not only did not blame him for not doing his job properly, but also had a positive attitude toward his learning of experimental design.

"Luo Gaogong, the things in the books are not focused on the industry, and many things are obscure and difficult to understand. We still need your guidance and teaching!" Xin Tong said sincerely.

Take the experimental design of the bonding process as an example. If you only have theoretical knowledge but are not proficient in this process, you still need to cross the river by feeling the stones.

This is a project that requires combining theory with practice!

Luo Gaogong has solid theoretical knowledge and rich practical experience. If he can get the guidance of this great god, he will definitely avoid many detours in his life journey to climb the peak of knowledge.

Hearing this, Luo Gaogong was deeply moved. After working for so many years, he has the right to speak more than anyone else. The semiconductor industry is too special, and it is far from enough to rely on the superficial knowledge in books.

But the young man in front of him has a quick mind, he knows that he can't ask Su Tianyi, the process engineer, why he can't find out why, and he also knows that Sun Xiaolong, the king of the bonding process, will be wary of him.

If Xin Tong has mastered the knowledge of DOE, won't the Mingyueguang packaging and testing factory, which relies on technology for a living, smash their jobs?
In a cruel workplace, they are both teammates and competitors, how can they teach each other everything?
"Xin Gong, as far as the bonding process is concerned, there are usually three factors and three levels when doing experimental design analysis!" Luo Gaogong patted the young man on the shoulder, and he wanted to give the young man some advice.

In fact, besides him in Mingyueguang Packaging and Testing Factory, who would help this young man solve his doubts?

When Xin Tong heard this, he didn't have a bright expression. On the contrary, he frowned: "Gaogong Luo, I found out that there are four core process parameters in the bonding process, which are bonding temperature, bonding time, bonding pressure and ultrasonic pressure. For power, you use three factor analysis and miss a core process parameter.”

These four core parameters are summed up by young people after careful observation. How can DOE analysis only do three?
Seeing the confused look of the young man, Luo Gaogong smiled faintly: "Xin Gong, you are a person who is willing to use your brain. Your summary of the core process parameters is correct. However, for the ASM bonding machine in our workshop, the bonding temperature It’s usually fixed and there’s no need to do three-level analysis!”

It turns out that the temperature has been fixed!There is still a certain distance between what is in the book and the reality.

"In addition to the bonding temperature parameter, do the other three parameters need to be analyzed horizontally?" Xin Tong asked rhetorically.

As for level analysis, the young man was also at a loss, so he immediately brought up the topic.

Luo Gaogong listened and nodded: "Xin Gong, yes, these parameters need to be analyzed for level, but to find the level, for a layman, it is like finding a needle in a haystack!"

"So there is nothing we can do?" Xin Tong continued to ask.

There is no doubt that this is the knowledge point of knocking on the blackboard.

"Xin Tong, it is relatively easy for an expert to find the level. Usually bonding machine manufacturers will have recommended parameter ranges. We only need to select typical levels within the range given by the supplier for analysis!" Just a few simple sentences, each sentence has a very high gold content.

So this is ah!

When the young man heard it, he suddenly realized that DOE is like searching for suspects and criminals. The equipment manufacturer has already locked the approximate parameter range, and the process engineer only needs to search within this range.

"Thank you Gaogong Luo, I understand!" Xin Tong nodded.

After removing the rock in his heart, the young man feels extremely comfortable, just like a martial arts practitioner who has opened up the two veins of Ren and Du.

"Young man, if you still have any questions you don't understand, just ask me!" Luo Gaogong smiled slightly.

During the written entrance examination, he solved the problem carefully designed by himself, and he felt that he was destined to be with the young man in front of him.

Sure enough, this young man was extraordinary. Not only did he help the engineering department win the championship in the basketball league, but his skills were extraordinary.

Xin Tong scratched his brain with his hands and figured out the factors and levels. There is no problem with the implementation of the experimental design. According to the steps, the evaluation is completed after the implementation. He is still very vague about the evaluation.

"Luo Gaogong, how do you evaluate the success or failure of the experimental design and implementation of the bonding process?" the young man asked.

Luo Gaogong's eyes sparkled movingly. This young man's ability to ask so many questions at least shows that he has used a lot of brains in the process of learning.

He is such a thoughtful man.

"Good question! Indeed, the evaluation after DOE implementation is very important. When we input the collected data into the Minitab analysis software, the system will prompt us with the optimal factor combination. Is this combination the best? Minitab software said It doesn’t count, we need to use this set of parameters for production verification, and the verified data counts.”

"As far as the bonding process is concerned, we need to look at the arc height of the gold wire and the shape of the gold ball. We need to use Dage4000 to do the push test of the gold ball and the pull test of the gold wire. You should have seen these test items. We modified the machine We do it all the time, and on top of that, we need to do IMC analysis!"

Luo Gaogong was eloquent, and he had already mastered this knowledge by heart.

"IMC analysis?" The young man was confused again.

"IMC is the abbreviation of Intermetallic compound. Translated into Chinese, it means interface alloy co-compound. It refers to the behavior of atomic migration and interaction between the interfaces of certain metals that are in close contact with each other, forming a layer of alloy-like compounds."

"After the chip is bonded, IMC will be formed between the gold wire and the aluminum pad of the chip. By detecting the area of ​​the IMC alloy, we can judge the bonding quality!"

Luo Gaogong explained very patiently.

"Does our company have IMC analysis capabilities?" Xin Tong asked.

"Yes, after the bonded chip is treated with potassium hydroxide or nitric acid solution, the gold wire will be corroded and the pad will be left. Then the IMC coverage area can be analyzed by Image-Pro Plus 6.0 software. For the gold wire welding For chips, the IMC coverage area only needs to be greater than 80% of the pad area." Luo Gaogong said.

(End of this chapter)