I've done whatever I want

Chapter 124 Seven Steps

A yellowed FMEA book is like a martial arts secret book in the hands of a knight. Xin Tong feels like he has found a treasure!

"Yuan Gong, eat slowly, I'm going back to the bedroom!" After speaking, Xin Tong walked to his bedroom.

Everything in life is not easy. During the day we earn money for a life of oil, salt, soy sauce and vinegar, and at night we spend time with our families for love. Many people have never found the right career or met the right person in their entire lives. Lived an ordinary life.

Kazuo Inamori once said that one must not neglect two things in life, one is to find the right lover, and the other is to find the right career, because when the sun rises, one should devote oneself to one's career, and when the sun sets, one should embrace one's lover.

Lying on the comfortable bed, holding the yellowed FMEA Handbook in his hand, Xin Tong fell into deep thought.

Is He Silian excellent?Of course excellent!

Xin Tong was indeed a little heartbroken about missing He Silian, but he had no regrets and thanked God for arranging for the beautiful Li Aileen to meet him.

This is a careful decision!At present, it seems that this choice is the right one.

In the boring life journey of making cores, Irene, who has an international perspective, will definitely provide herself with a lot of unexpected help!

For ordinary people, meeting the right person in this life is half of the mission in life.However, Xin Tong has lived more for chips in his life.

Having experienced the hatred of missing chips in his previous life, Xin Tong deeply knows that this is a major event that affects the future of the country's development. He feels that only by making good chips can he get rid of the dilemma of the country and the nation being stuck, and win glory for the country!

Now it seems that his development in the chip business is also good.

In the technical competition at the beginning of the year, Xin Tong was promoted to the core bonding process manufacturing engineer of the packaging and testing factory, and a new opportunity came again. The position of project manager does not seem to be far away. One piece, he was full of confidence.

First, learn the knowledge of packaging and testing in a down-to-earth manner.

I didn't get the self-examination diploma, and it is not realistic to enter the wafer manufacturing industry and chip design office under the current situation.

Quietly flipping through the FMEA Handbook in his hand, Xin Tong understood that whether it was the SPC technique that he was proud of defeating Shi Kaitian in the past, or the DOE technique that made Su Tianyi restless, they were all designed for special processes. The control method does not systematically manage all risks in the product manufacturing process.

The things in this book in my hand are different.

After careful study, the young people found that FMEA is broad and profound, and controls almost all risks in the production process. It is a summary and reflection of the failure experience in the production and manufacturing process of the enterprise, and provides methods and strategies to avoid falling into the same trap for the second time. It is the core secret of a company Know How.

Read carefully, the book divides FMEA analysis into seven steps, referred to as the seven-step method.

What impressed Xin Tong most was the structural analysis described in the book, which divides the product manufacturing process into process items and process work elements. In this way, all production risks are included in the scope of control.

As far as packaging and testing plants are concerned, the process items in the FMEA structure are process steps, such as wafer thinning process, wafer cutting process, chip loading process, bonding process, etc.

Each process item is divided into process work elements, specifically divided into five elements, namely personnel, machines, materials, methods and environment.

For example, if we want to analyze the process of wafer cutting, we must start from five major elements. How do people load materials in this process? What kind of failure will occur if there is an error in loading?And so on.

Seeing this, Xin Tong thought of the seven techniques that he had practiced, personnel, machines, materials, methods and environments. These are the 4M1E mentioned in the fishbone diagram.

Isn't this just a fishbone diagram analysis for each process?

No, FMEA has its own set of rigorous logical relationships.

The fishbone diagram has a fish head, which is the problem point, and is developed for the problem. FMEA is developed for functions and failures, which is a bit like brainstorming.

What's more interesting is that for each failure, FMEA needs to do SOD analysis to evaluate the risk level.

The SOD mentioned in the FMEA is completely different from the SOD honey in Dabao facial cleanser.

S is the abbreviation of the English word Severity, which refers to the severity. Severity is a subjectively estimated value, which is the impact of the failure that the customer (next user) or end user will perceive.

O stands for Occurrence, which refers to the frequency of occurrence, sometimes called likelihood, and is a numerical subjective estimate of the likelihood that a failure mode will occur during the design life, or during the production process.

D stands for Detection, which refers to detection, sometimes called effectiveness.It is a numerical value of a control's effectiveness, a subjective estimate of the cause or failure mode that is detected prior to sale.

Each item of SOD is assigned a value from 1 to 10, and the higher the value, the greater the risk.

As a general rule, any failure mode that results in a 9 or 10 will be the first priority, and a corrective and preventive action must be taken to bring this down.

In addition to individual assignments, RPN (Risk Priority Number) is also a very critical risk level assessment indicator.

RPN is the product of the frequency, severity and detection level of an event. It is called the risk coefficient or risk priority number. The larger the value, the more serious the potential problem. It is used to measure possible process defects so that possible preventive measures can be taken. Reduce critical process variations and make the process more reliable.Process corrections should first focus on those areas of greatest concern and risk.

The process of FMEA analysis is the process of continuously calculating the RPN value. By taking corrective and preventive measures, the value is finally controlled within a reasonable range, thereby achieving the purpose of risk control.

That night, Xin Tong was very excited and couldn't put down the scroll until three o'clock in the morning.

At first, yawning was effective, but later he was no match for sleepy bugs, his eyelids sank, his head fell, and he fell asleep.

Early the next morning, the sun was shining in August. He hurried down the building of the rental house, bought two steamed buns and a bottle of mineral water at a roadside stall, and walked quickly towards the factory.

When he walked to the office, he put the yellowed book in his hand on the table, and he caught Su Tianyi's attention.

"Xin Gong, are you watching FMEA?"

Su Tianyi was very surprised. He had heard someone mention FMEA, but the content was too advanced and he stayed away.

This kid Xin Tong, a high school student, actually studied FMEA, he is really overconfident!

Hahaha, Su Tianyi sneered a few times.

Xin Tong glanced at him, saw his sour expression, and lied to him: "Su Gong, I read FMEA just like you read Jin Yong's martial arts novels, it's here to pass the time."

"Xin Gong, I advise you not to bring recreational books to the office. It will have a bad influence." Su Tianyi said in a drawn out voice.

　Thanks for the reward from Humble Ball One, and thanks for the monthly and recommendation tickets of the book friends whose tail number is 8083!This chapter will introduce you to the tool of FMEA!Very useful.

　　
　
(End of this chapter)