COMPUTER PAINTING AUTOCAD HAS BEEN AROUND SINCE 1982, AND BY 1991, IT WAS ALREADY THE 11TH VERSION, AND IT COULD NOT BE OPERATED IN THE WINDOWS OPERATING ENVIRONMENT.

If you want to use the Windows operating environment, the earliest is in August 1992, AutoCADR 12.0 version was released.

It was only in 1997 that it was able to adapt to the Pentium model and the Windows 95/NT operating environment.

Even if Fang Bai can use CAD, he will have to wait until the end of next year at the earliest.

But at the moment, he can only draw with a pencil on a blank piece of paper.

He asked Wang Dakai to buy back dozens of sketch papers that were one size of the sketch paper, and then spread the sketch paper on a large table to draw, and if he made a mistake, he could only erase it with an eraser, not as convenient as CAD.

Before drawing, Fangbai split the structure of DN150/PN100 gate valve: valve body, valve plate, valve cover, valve stem......

Formulate important design parameters: nominal inner diameter DN150, nominal pressure PN100, material WCB......

According to the general structure, a design BOM list was made, listing the drawing number, quantity, material, etc. of each part, which is actually a list of parts.

Before the large-scale design division of labor, there will be a design BOM, and the design director will send the task to each designer, who is responsible for which part of the design.

Fang Bai has no subordinates, but it is also useful for him to design the BOM, so as not to have too many parts and make it easy to get confused.

It is not enough to have a BOM list, and the chief design person must also explain the important parameters of each component clearly.

For example, valve body: wall thickness, calculated pressure, calculated inner diameter, allowable tensile stress, corrosion allowance, minimum wall thickness, etc.

It took half a day for Fang Baiguang to sort out the calculations of these works and various parts.

Fortunately, the structure of a gate valve is not complicated, the main components are the valve body and valve plate, and the rest are some standard parts, such as bolt standard parts, which do not need to be designed, as long as the bolts are thick and long, the number and the grade are selected.

"Hey, it seems simple, but it's still very troublesome to draw."

Fang Bai began to design the valve body structure, he was familiar with the drawings, but the individual dimensions were forgotten, fortunately, the impact was not large, and the modification was modified.

You can't use your gold finger to analyze until you've finished a drawing.

In other words, if you want Goldfinger to help him analyze, you have to let the plug-in know what you are drawing.

Fang Bai drew pictures at home, and Qin Shuyu came over to accompany him during the day.

One draws a picture, the other looks at the information of the CPA.

When both of them were tired, they closed the bedroom door and relaxed in the room.

Fang Bai is not Liu Xia Hui, but it is really inconvenient at home, so he can only taste it and wait until Shencheng will talk about it.

After a few days, Qin Shuyu also learned badly, hugged Fang Bai's neck, and said in his ear, "Fang Bai, there are dirty things on my clothes."

Fang Bai sometimes happened to be immersed in mechanical drawing, but he had to satisfy Qin Shuyu's request.

A few days later, Fang Bai finally drew the first draft of the DN150/PN100 gate valve.

Then use the middle finger gold finger to analyze the design, and the picture is full of red!

Fang Bai was not in a hurry to revise, but analyzed the mistakes one by one, figured out the problem, and wrote it down, which was the best opportunity to learn and summarize.

He lacks design experience, and Goldfinger is the best instructor.

It can be said that after he finished drawing this set of drawings, it was equivalent to others learning for several months.

Thinking of this, he simply picked up the blank paper and redrew the drawing.

After another three days, he was not satisfied until there were no more red dots on the new drawings.

It can be said that the drawings of the new design not only solve the design problems, but also solve some process manufacturing problems, making manufacturing easier and manufacturing costs lower.

Even if it is the same type of valve, the price is the same, and the profit margin of the products designed by Fangbai is greater.

I also have to say that the gold finger assists in drawing, even if there is no CAD, the drawing efficiency is very fast, and it only needs to be modified once or twice.

If there is no gold finger assistance, the product designed by Fangbai, under normal circumstances, after the new product is designed, it will be analyzed and discussed by the design department, and the trial production will not start until it is finalized.

Problems will be found during the trial production process, and then the drawings will be modified, and then the trial production will be re-produced.

After the trial production is no problem, it does not mean that the designed product is qualified, and various tests should be started for verification.

If there is a big problem found during the test, the drawings will be modified and the trial production will be re-produced.

It is not until the trial production and trial are no problem that small batch production is started to verify the process.

If there is no major problem with the process, it can be put into mass production.

It may only take a few days to draw this set of valves, but it takes a lot of time for subsequent analysis, trial production and verification, let alone two or three months, or even up to one or two years.

Moreover, in the process of customer use, problems will be found, and then continuous optimization.

After a new product is launched, it will take many years of repeated verification and optimization before it can be said to be mature.

Therefore, Fang Bai's golden finger helped him save a lot of time and avoid many detours.

Just like this, Fang Bai felt that his gold finger was very perverted, which greatly shortened the research and development cycle.

If it is still LV3, Fang Bai still needs to make a physical object to analyze, which delays a lot of time.

After Fang Bai designed the drawings, he went to the mall to make a copy of the drawings and handed them to his father-in-law, so that he could make the mold for the valve body casting.

The valve body is a WCB material casting, so it needs to be made of a casting mold, and the manufacturing cost is not low.

The structure of the valve body is complex, the processing cost is too high, and the processing is very difficult, and the casting method is generally used, and the manufacturing cost is low.

However, the material density of castings is definitely not as good as that of forgings, and there are many problems in castings, such as common sand inclusion, porosity, riser problems, etc.

This casting process has been like this for decades, even after twenty or thirty years, there is no qualitative change.

When Fang Bai designed the valve body, he had already noticed this problem, mainly from the structural solution, so that the metal liquid can flow smoothly into all parts during the casting process.

At the same time, Fang Bai prepared the materials for applying for a patent.

The appearance patent, utility model patent and invention patent information are applied for together, although Fang Bai has not been engaged in patent matters, but he still understands more or less.

Fang Bai has been busy, and the time soon came to August 19th, which was the day of his college banquet.

His parents arranged for the banquet to be held in a hotel in Yongjia County, inviting not only relatives and friends, but also teachers from Oubei No. 1 Middle School, and Fang Bai took the opportunity to invite county leaders and some business partners.

In the past few days, the invited guests have been worried about the etiquette.

Send money, there is no shortage of people.

This is a bit troublesome, if people are short of money, it is easy to solve, just wrap a red envelope, but I met a master who is not short of money.

Last night, when the family was chatting in the living room, Liu Fengqing said that this college banquet must be faced, and she was very curious about how many gifts some people gave them, and then sent back in double copies.

"Mom, you're a little mischievous!" Even Fang Tingting felt that her mother was a little damaged.

Fang Bai was too lazy to say it, his mother's temper couldn't be changed, and no one could stop him.

Liu Fengqing smiled: "I didn't learn it from your brother, he had a bad stomach." ”

Fang Bai didn't have any opinions, he didn't speak but carried the black cauldron, and retorted: "Mom, I don't carry this black cauldron!" I think some of the bad water in my body was inherited from my parents. ”

"Brother, you just carry it, it's not bad this time anyway, ho ho." Fang Tingting sat cross-legged on the sofa and smiled happily.

"Hehe, okay, I'm also curious, what will happen to these relatives when they see the double red envelope." Fang Bai didn't bother to refute.

Fang Shi watched TV and didn't speak silently, he was afraid that he would be splashed with dirty water.

(End of chapter)